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Rival theories for a global cooling
Did a cosmic impact cause the Younger Dryas cooling?
My latest Mind and Matter column for the Wall Street Journal:
Scientists, it's said, behave more like lawyers than philosophers. They do not so much test their theories as prosecute their cases, seeking supportive evidence and ignoring data that do not fit-a failing known as confirmation bias. They then accuse their opponents of doing the same thing. This is what makes debates over nature and nurture, dietary fat and climate change so polarized.
我在《华尔街日报》Mind and Matter专栏的最新文章中说:
But just because the prosecutor is biased in favor of his case does not mean the defendant is innocent. Sometimes biased advocates are right. An example of this phenomenon is now being played out in geology over the controversial idea that a meteorite or comet hit the earth 12,900 years ago and cooled the climate.
That the climate suddenly cooled then, plunging the Northern Hemisphere back into an ice age for 1,300 years, is not in doubt. The episode is known as the Younger Dryas, because in Scandinavia abundant pollen from a tundra flower called the mountain avens, Dryas octopetala, reappears in soil from this date, indicating that the forest had once more given way to tundra. With the sudden arrival of cooler, drier and less predictable seasons, early human attempts at agriculture in the Near East ceased, and people returned to nomadic hunting and gathering.
The cause of this cold lurch was seemingly settled some time ago when Wallace Broecker, a Columbia University geochemist, suggested that a North American ice sheet collapsed, flooding the Atlantic with fresh water, which interrupted the normal circulation of the Gulf Stream.
早些时候,造成这次寒冷突变的原因看似已有了定论。哥伦比亚大学的地质化学家Wallace Broecker认为,因北美冰盖崩塌而新增的融水涌入大西洋,这使得墨西哥湾流的正常循环被打断。
Then a marine geologist, James Kennett of the University of California, Santa Barbara, said he had found evidence of the impact of a large object from space 12,900 years ago, in the form of carbon spherules in silt.
然而,加州大学圣芭芭拉分校的一位海洋地理学家James Kennett说,他从淤泥里碳球粒状体的形态中发现了12900年前大型天体撞击的证据。
Dr. Kennett's argument is that a swarm of meteorites punched through the atmosphere and caused a vast conflagration, filling the air with dust and soot. This shut out the sun, causing decades of continuous winter -sufficient to trigger an advance of ice sheets that, even when the dust cleared, kept the climate cool for more than a thousand years, at least in the Northern Hemisphere.
Dr. Kennett prosecuted his case with gusto, also suggesting that the impact had extinguished North American mammoths, just as an earlier impact had finished off the dinosaurs (a theory hard to reconcile with the survival of mammoths for thousands of years longer on islands off Siberia and Alaska, where hunters could not reach them).
He suffered a key setback in recent years when several groups failed to find the right kinds of spherules or otherwise duplicate the results of his team's work-and, worse, when a spherule sample from Younger Dryas rocks proved to be only 135 years old.
But spherules, dated to the right period, now have apparently shown up. Dr. Kennett and colleagues have published evidence in the prestigious Proceedings of the National Academy of Sciences that a "black mat" from the sediment of a Mexican lake dates to 12,900 years ago and shows a sudden peak of magnetic and carbon spherules, "nanodiamonds" of a kind known as lonsdaleite, and charcoal: all of it evidence of extreme heat.
Last year Michael Higgins of the University of Quebec published details of an underwater crater in the Gulf of St. Lawrence, arguing that it may also date from as little as 12,900 years ago. The crater, three miles across, has the characteristic central mound of a fresh meteorite impact. Its meteorite was probably too small to shift the climate, but perhaps it was part of a swarm.
去年,魁北克大学的Michael Higgins发表了关于圣劳伦斯湾一个水下陨石坑的细节,声称它也可以追溯到12900年前。这处3英里宽的陨石坑具有新陨石撞击坑所特有的中心土丘。这颗陨石可能太小,尚不足以影响气候,但也许它是一个陨石群的一部分。
After the previous debacles, the jury will take much convincing that the new results can be replicated. But the burden of proof has shifted a little in Dr. Kennett's favor. After all, Dr. Broecker and his followers, too, may be emotionally invested in his ice-sheet theory: Confirmation bias can affect us all.
校对:Marcel ZHANG(微博:@马赫塞勒张),小册子(微博:@昵称被抢的小册子)


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subset: commoncrawl


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Petty family
by Steven Case, 2010.
NC Government & Heritage Library.
Stock car racing fans need no introduction to the Petty family. The patriarch of this racing dynasty was Randolph County native Lee Petty who won 54 NASCAR Grand Nationals during his career and was three times NASCAR Grand National Driving Champion. He died on April 5, 2000, at the age of 86.
Lee's son Richard Petty and his grandson Kyle Petty have taken the family vocation to new heights. Richard Petty's career included 200 NASCAR Winston Cup wins and he was nine times named the Most Popular Driver in the Winston Cup series. Among his victories are 7 wins at the Daytona 500, a race his father won in 1959. Daytona also has been a good track for Kyle Petty. The very first stock car race Kyle entered was at Daytona and he came in first. Kyle has won over $8,000,000 so far and is still going strong. In 1997 he became an owner as well as a driver. Adam Petty, Kyle's son, had also become active on the racing scene, competing on the NASCAR and ASA circuits, before he was killed in a practice run on May 12, 2000 at the age of 19.
The family maintains the Richard Petty Museum in Level Cross, North Carolina.
Image credit:
Paul Morse. American NASCAR drive Richard Petty meeting George W. Bush at the Victory Junction Gang Camp, Inc., 2006, Randleman, N.C, USA.
1 April 2010 | Case, Steven


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Do what thou wilt shall be the whole of the Law.
The world has entered (March, 1904) the New Æon, the Age of the Crowned and Conquering Child. The predominance of the Mother (Æon of Isis) and of the Father (Æon of Osiris) are of the past. Many people have not completely fulfilled those formulae, and they are still valid in their limited spheres; but the Masters have decided that the time has come for the administration of the Sacraments of the Æon of Horus to those capable of comprehension. The sexes are equal and complimentary. "Every man and every woman is a star" AL 1:3. The priestess must now function as well as the priest.
The expression of the above thesis in public ritual is to begin by the establishment of the Gnostic Mass which, while adhering to the vital elements of the most ancient true tradition, fixes its attention on, and its aims most truly in, the Future.
Love is the law, love under will.
If you are interested and willing to help in any way please communicate with the undersigned from whom further particulars can be obtained:
W. B. CROW, D.Sc., Ph.D. BM/NAOS
Notes by Sabazius X°
This manifesto was drafted by Dr. W(illiam) B(ernard) Crow (1895 – 1976) in August 1944, and edited and approved by Aleister Crowley as Baphomet X° in August and October 1944 for circulation. Crowley corresponded with Crow from May 1944 through September 1947.
Crow, by profession a biology teacher, was also an avid occultist and Theosophist, with a wide range of esoteric and religious interests. In 1939, he founded an eclectic esoteric society called the Order of Holy Wisdom, which claimed to teach the hidden knowledge of the sacred traditions of all nations, past and present. Crow became an author late in his life, and produced such titles as A History of Magic, Witchcraft and Occultism [1968], Precious Stones: Their Occult Power and Hidden Significance [1968], The Occult Properties of Herbs [1969], and The Arcana of Symbolism [1979].
Crow's interest in the Liberal Catholic Church led him, in 1943, to be consecrated in the Syrian-Antiochene (Ferrette) succession of episcopi vagantes by the Rt. Rev. James Heard. Crow then, as Mar Basilius Abdullah III, claimed the title of "Sovereign Prince Patriarch of Antioch." This consecration provided many new opportunities for Crow, and he began to expand his influence. In April 1944, he passed his Apostolic lineage on to Hugh George de Willmott Newman, who then, as Mar Georgius I, claimed the titles of Metropolitan of Glastonbury and Catholicos of the West. Around the time of Newman's consecration, Crow sent Crowley some of his pamphlets, which initiated Crowley's correspondence with him. Crowley, of course, sought to enlist Crow's aid in establishing the Law of Thelema and in promoting O.T.O. and especially E.G.C., and Crow seemed, at least at first, to be interested; although it is unknown whether Crow ever actually became an initiate. There are no surviving records of his initiation, and as late as May 1947, Crowley was suggesting that Crow send his followers to Gerald Gardner to be initiated in O.T.O.
Two documents pertaining to Crow's relationship to O.T.O. and E.G.C. have been circulated in recent years by individuals who oppose the current leadership of O.T.O. One of these documents is purported to be Crow's claim to have been duly "elected" as head of the Rites of Memphis and Mizraim and the Oriental Templar Order in 1948, "in accordance with the constitution and regulations" of the Order, and to have relegated these rites to a sub-division of his own Order of Holy Wisdom. This document makes no mention of Aleister Crowley, Theodor Reuss, or Carl Kellner, or of anything pertaining to Thelema. The document advocates a restoration the original doctrines of the Knights Templars, and it eschews affiliation with any Oriental Templar groups that do not adhere to these original doctrines. In his A History of Magic, Witchcraft and Occultism, Crow makes it clear that he does not believe that the original doctrines of the Templars included any teachings regarding sexual magic.
Now, Crowley's documented successor as head of O.T.O. was, of course, Karl Germer. Also, the Constitution of O.T.O. does not prescribe election as the mechanism of succession to the office of O.H.O. Furthermore, before Crow's death in 1976, all authority, title, succession, and archives related to the Order of Holy Wisdom was deeded to his successor W.H.H. Newman-Norton, Mar Seraphim, Metropolitan of the British Orthodox Church. According to correspondence with Mar Seraphim's representative in 1995, Mar Seraphim himself makes no claim of any control over Ordo Templi Orientis, and is personally unaware of any claim of Crow to have succeeded Aleister Crowley as O.H.O. of O.T.O. Since Crow never actively asserted any claim to authority in O.T.O. during his lifetime, and evidently passed no such authority on to his successor, the significance of this document, if any, is moot.
The other document purports to be Aleister Crowley's appointment of Crow as Patriarch of the Thelemic E.G.C., dated August 1944, the same date as the original, rough draft of the Manifesto. This document (which, to my knowledge, is unsigned) contains a number of striking stylistic similarities to Crow's original draft of the Manifesto, but there is no copy of it to be found in the correspondence archive that was made available to O.T.O., nor is there any mention of it, or even any allusion to it, in any of the letters therein, including the two letters from Crowley dated August 1944. The letters in the archive contain considerable discussion of the Manifesto, and one must wonder why such an important document as a Letter of Patriarchal appointment would go completely unmentioned. Even if this document were valid, which is far from certain, it does not include any statement of abdication of supreme authority in E.G.C., nor does it include any indication that the rights bestowed are, in any way, exclusive. It would, therefore, have constituted an appointment of a subordinate, possibly one of several such. Crow never attempted to activate E.G.C. in England, and never attempted to assert control over it elsewhere, so the significance of this document (if any) is as moot as that of the other document.
…the time has come for the administration of the Sacraments…
Crow's original text read, "The time has come for High Initiates to administer the Sacraments of the Æon of Horus to those capable of comprehension." On Crowley's proof copy, he struck out the words "for High Initiates" and wrote in the margin, "I always dislike dragging in these claims. Besides, quite low initiates can do this work."
Interestingly, the words "the time has come for High Initiates to administer the Sacraments of the Age of Horus" occur in Crow's alleged Patriarchal appointment document — virtually the same words that Crowley purposely struck from Crow's draft of the manifesto. One can only speculate as to why Crowley would have made this correction in one document but not in the other.
Proof read and edited by Frater D.M.T.
Contributed to Bahlasti Ompehda O.T.O. (Hungary, Anno Viii)


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text: Mount Mitake lies a couple of hours West of Tokyo by train. A combination of bus and cable car brings you to the village and temple on the summit. From there, many hiking trails are available. I opted to hike the round-trip through the "Rock Garden", which is a valley with two pretty waterfalls.


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Improving the Motorola Blink Baby Monitor/Camera (Part 5)
So I took the camera apart and took a high-res picture of the PCB. The wifi sub-board is soldered on so I won't remove it yet to expose the ARM CPU. That being said, maybe there's a clue on here for how to mount and write to the flash memory:
Read more »


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Tag archive: diabetes
JDRF Egg Crack Challenge
When your best friend has insulin dependent diabetes, you have to do something – besides freak out and cry with her; though we've done our share of that over the years. Nope, a best friend has to take action.
So, when Jean Graham took the Will Hauver JDRF Egg Crack Challenge and nominated me to do it too, it was a foregone conclusion I was going to support her, take the challenge, and donate to the cause!
My bestie is an amazing woman who has bravely navigated the diabetes waters with a smile on her face (mostly) and a desire to be a strong role model to her daughters and others. She takes on the 24/7 challenges of this disease with grace and style in spite of her desperate wish she didn't have to – there are no breaks or vacations from diabetes. She recently created a blog to help other newly diagnosed diabetics feel a little less alone: lifeandthesweetlife. But behind her winning smile and helpful blog posts lies a tender heart beating madly to keep her emotions in check while the infuriating numbers on her many devices occasionally tell her she's over or under estimated the amount of insulin needed to cover her food intake or exercise output. When things don't add up, it's not that her calculations are wrong, but her metabolism plays insidious tricks on her, putting the perfect dose elusively just out of reach, while she plays a Price Is Right sort of bidding game with the bolus. I can hear Bob Barker shouting into his mic "Higher, Lower, Higher, Lower," while she furiously tries to compensate for something entirely outside of her control. Yet, she puts each episode quickly behind her – no looking back – and readies herself for the next dance with diabetes. She's got a life left to live and she truly is an inspiration. See for yourself:
So what's a best friend to do?
Why make fun of her of course! She couldn't possibly have thought I was going be mediocre about this "challenge" could she? I mean does she even KNOW ME??
I hope you watched through to the end including ALL of the credits – it's worth the time. If not, go back and finish watching! See? Told you it was worth it! Special thanks to my husband Neel for being a the best straight man, Chesney and Cambree for being roped into the action at the last minute, David Aman for his tireless work filming and editing and to Grace and Tony and The Black Feathers for the use of their songs.
Now, if you care at all about trying to knock out this disease that literally destroys bodies and takes lives, help us make this thing viral!! LIKE, SHARE, and REPOST far and wide!! Then take the challenge yourself. Take a video and share it using the hashtags #EggCrackChallenge #EllenEggCrack #JDRFeggcrack #T1DEggCrackChallenge for the most exposure! Don't forget to donate too or you've missed the point of the whole thing.
It's YOUR turn to Crack, Nominate, and Donate!


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LED-ing the Revolution
A Conversation with Fred Davis, Brian Chemel and George Woodbury about the savings potential with smart lighting systems.
The following interviewees are presenting their lighting expertise at BuildingEnergy 15,
Learn more about BuildingEnergy 15 here: http://nesea.org/be15
LEDs are the next best thing in energy efficient lighting, but so many building professionals still are "in the dark" about how to best use the technology. This quandary inspired energy-lighting expert Fred Davis to curate two lighting sessions at BuildingEnergy 15. I listened in on a conversation between Fred and two speakers, Brian Chemel of Digital Lumens and George Woodbury of LightSmart Energy, who are achieving energy savings of 80-90% with the use of smart controls coupled with LED technology.
Fred: Most people at Building Energy aren't lighting specialists. What are one or two key points that anyone who's working on sustainable energy use, whether as a designer, engineer, program manager, or government official, should know about LED technology?
Brian: Everyone should know that the switch to LEDs as a light source is only a small part of the energy savings story. In certain situations, embedding micro-controllers and sensors into lighting systems really changes what's possible: lighting becomes an integral part, perhaps a backbone, of building management.
George: I work mostly in outdoor lighting, and similarly to what Brian said, I'd say that streetlights aren't just equipment to illuminate roadways. A streetlight is a piece of real estate that has power 24-7. So when you put controls on it you've got a communication network. A whole world of possibilities opens up to meet other needs.
Fred: Are you really achieving upwards of 80% savings on your projects?
George: Well, typical LED conversion of streetlights will achieve 60% savings or so. And yes, when you add controls, you can get above 80%.
Brian: Yes, we've done hundreds of facility retrofits that are achieving 80-90% savings with payback periods of 18-36 months. But it's not because there's someone onsite actively managing the system. The trick is in the software and the automation.
Fred: So does that mean that you don't need an engineer onsite to operate these systems?
Brian: The end-users for our systems are typically not very technically sophisticated. In fact, we never assume there's an engineer on site after commissioning.
George: There are two different approaches to controlled lighting. Some clients work with companies that provide the network and the software as a service; they set it up, train you how to use a web portal, and stand behind it to make sure everything works. Other clients want the system to reside on their own servers. That's more complicated and does require you to have the staff to manage it.
I've seen too many school systems with very sophisticated energy management systems that no one knows how to operate.
Fred: What about cost effectiveness?
Brian: The savings are what get these projects done, but I also think it's important to zoom out a little bit from the energy savings. The data these systems can generate and their ability to be tuned over time end up being as valuable as the raw savings if not more so.
George: Outdoor lighting falls into two basic categories. With metered lighting there's always an opportunity. With unmetered street lighting it depends on the utility. Installing controls on an outdoor lighting system can nearly double the cost, so you need a tariff in place that provides the benefit for having controls. When you ask the utilities whether they will be adopting tariffs that support the use of controls, the answer is always a matter of when, not if. I have found that the investment is a fairly easy sell even in places that don't yet have a tariff yet, -because the lifespan of these systems is twenty years and the tariffs will catch up.
Fred: What is your biggest challenge?
Brian: We're a venture-backed startup and growing very rapidly.
A big question for us is what markets do we apply our technology to next? If the world is going in the direction of connected lighting, how do we get there?
George: For me the biggest challenge is the utility companies. They are very resistant to change and protective of their revenue stream. I'm going around from state to state, working to pass laws that require utilities to cooperate. That seems to be the only way we can achieve the full potential of smart control technology.
Learn more about BuildingEnergy 15: http://nesea.org/be15
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text:
10 Mar 2010
Mozilla Revises MPL
Earlier today, the Mozilla Foundation announced its process for revising MPL 1.1, in a public comment-driven process lasting until the fall.
I like their process announcement, which proposes a reasonable schedule and workflow. The Foundation has clearly studied the GPLv3 process, and has drawn good conclusions about what worked for us, and what will work better for them if done differently. They're using Co-ment, the wonderful Web-based text annotation system designed and implemented by Philippe Aigrain and his colleagues at Sopinspace in Paris. They helped us design the Stet system we used for GPLv3, and they've gone far beyond it with Co-ment.
The MPL has been an influential free software license, but I agree with the unstated proposition of the Mozilla Foundation that it's now showing its age. I think this is precisely the right time to be doing the revision, and I wish the Mozilla folks a smooth, thoughtful, and successful process. I hope everyone who cares about the health of Web, and about free software licensing, will register and get involved. SFLC and I will be doing whatever we can to help. And I sure look forward to being an insignificant minor player this time around…
| licenses/mpl | 2010.03.10-12:30.00


text:
Zipp's Tangente Cork Brake Pads are perfect for Zipp wheels with carbon braking surfaces. They are made of a composite cork polymer for consistent brake response and to reduce glazing from the intense heat caused by braking on carbon. As a result, the Tangente cork pads avoid the brake pulsation produced by residue buildup from rubber pads and can even eliminate pulsation from rims with previous buildup. These pads have a unique shape with more material in the front to improve durability and shed water. Although the composite material wears similarly to low-temperature rubber compounds, the Tangente cork pads last longer than most rubber carbon-specific pads because of the shape and 0.5 mm greater overall thickness.
Not for use on wheels with aluminum braking surfaces
Please contact us with any questions on compatibility
Part Numbers
Option | UPC | MPN | Store SKU |
Campagnolo compatible | 710845676314 | 00.1915.129.020 | ZIP86558633R |
Shimano/SRAM compatible | 710845676307 | 00.1915.129.010 |


text:
- Maize
This article is about the cereal grain, primarily known as corn in the United States. For other uses, see Maize (disambiguation)."Corn" redirects here. For other uses, see Corn (disambiguation).
Maize Illustration depicting both male and female flowers of maize Scientific classification Kingdom: Plantae (unranked): Commelinids Order: Poales Family: Poaceae Subfamily: Panicoideae Tribe: Andropogoneae Genus: Zea Species: Z. mays Binomial name Zea mays
L.Maize (Zea mays L. ssp. mays, pronounced /ˈmeɪz/; from Spanish: maíz after Taíno mahiz,) known in many English-speaking countries as corn or mielie/mealie, is a grain domesticated by indigenous peoples in Mesoamerica in prehistoric times. The leafy stalk produces ears which contain seeds called kernels. Though technically a grain, maize kernels are used in cooking as a vegetable or starch. The Olmec and Mayans cultivated it in numerous varieties throughout central and southern Mexico, cooked, ground or processed through nixtamalization. Between 1700 and 1250 BCE, the crop spread through much of the Americas. The region developed a trade network based on surplus and varieties of maize crops. After European contact with the Americas in the late 15th and early 16th centuries, explorers and traders carried maize back to Europe and introduced it to other countries. Maize spread to the rest of the world due to its ability to grow in diverse climates. Sugar-rich varieties called sweet corn are usually grown for human consumption, while field corn varieties are used for animal feed and as chemical feedstocks. Approximately 37% of the United States' acres are corn fields.
Maize is the most widely grown crop in the Americas with 332 million metric tons grown annually in the United States. Approximately 40% of the crop - 130 million tons - is used for corn ethanol.[1] Transgenic maize (Genetically Modified Corn) made up 85% of the maize planted in the United States in 2009.[2] While some maize varieties grow to 12 metres (39 ft) tall,[3] most commercially grown maize has been bred for a standardized height of 2.5 metres (8.2 ft). Sweet corn is usually shorter than field corn varieties.
Naming conventions
The term "maize" derives from the Spanish form of the indigenous Taíno word maiz for the plant. This was the term used in the United Kingdom and Ireland, where it is now usually called "sweet corn", the most common form of the plant known to people there. Sweet corn is harvested earlier and eaten as a vegetable rather than a grain.[4]
Outside the British Isles, another common term for maize is "corn". This was originally the English term for any cereal crop. In North America, its meaning has been restricted since the 19th century to maize, as it was shortened from "Indian corn".[5] The term Indian corn now refers specifically to multi-colored "field corn" (flint corn) cultivars.[5]
In scientific and formal usage, "maize" is normally used in a global context. Equally, in bulk-trading contexts, "corn" is used most frequently. In the UK, Australia and other English-speaking countries, the word "corn" is often used in culinary contexts, particularly in naming products such as popcorn, corn flakes and baby corn. However, within the United States, the term "maize" is almost totally unheard of. "Maize" is used in agricultural and scientific references.[Note 1]
In Southern Africa, maize is commonly referred to as mielie or mealie, from the Portuguese milho.[6] Mielie-meal is the ground form. Corn is very popular in the Coastal Plains.
Structure and physiology
Maize stems superficially resemble bamboo canes and the internodes can reach 44.5 centimetres (17.5 in). Maize has a distinct growth form; the lower leaves being like broad flags, generally 50–100 centimetres long and 5–10 centimetres wide (2–4 ft by 2–4 in); the stems are erect, conventionally 2–3 metres (7–10 ft) in height, with many nodes, casting off flag-leaves at every node. Under these leaves and close to the stem grow the ears. They grow about 3 millimetres a day.
The ears are female inflorescences, tightly covered over by several layers of leaves, and so closed-in by them to the stem that they do not show themselves easily until the emergence of the pale yellow silks from the leaf whorl at the end of the ear. The silks are elongated stigmas that look like tufts of hair, at first green, and later red or yellow. Plantings for silage are even denser[7], and achieve a lower percentage of ears and more plant matter. Certain varieties of maize have been bred to produce many additional developed ears. These are the source of the "baby corn" used as a vegetable in Asian cuisine.
Maize is a facultative long-night plant,[citation needed] and flowers in a certain number of growing degree days > 50 °F (10 °C) in the environment to which it is adapted.[8] The magnitude of the influence that long nights have on the number of days that must pass before maize flowers is genetically prescribed and regulated by the phytochrome system.[9] Photoperiodicity can be eccentric in tropical cultivars, while the long days characteristic of higher latitudes allow the plants to grow so tall that they do not have enough time to produce seed before being killed by frost. These attributes, however, may prove useful in using tropical maize for biofuels.[10]
The apex of the stem ends in the tassel, an inflorescence of male flowers. When the tassel is mature and conditions are suitably warm and dry, anthers on the tassel dehisce and release pollen. Maize pollen is anemophilous (dispersed by wind), and because of its large settling velocity, most pollen falls within a few meters of the tassel. Each silk may become pollinated to produce one kernel of maize. Young ears can be consumed raw, with the cob and silk, but as the plant matures (usually during the summer months), the cob becomes tougher and the silk dries to inedibility. By the end of the growing season, the kernels dry out and become difficult to chew without cooking them tender first in boiling water. Modern farming techniques in developed countries usually rely on dense planting, which produces one large ear per stalk.
The kernel of maize has a pericarp of the fruit fused with the seed coat referred to as "caryopsis", typical of the grasses, and the entire kernel is often referred to as the "seed". The cob is close to a multiple fruit in structure, except that the individual fruits (the kernels) never fuse into a single mass. The grains are about the size of peas, and adhere in regular rows round a white, pithy substance, which forms the ear. An ear contains from 200 to 400 kernels, and is from 10–25 cm (4–10 in) in length.[citation needed] They are of various colors: blackish, bluish-gray, purple, green, red, white and yellow. When ground into flour, maize yields more flour, with much less bran, than wheat does. However, it lacks the protein gluten of wheat and, therefore, makes baked goods with poor rising capability.
A genetic variant that accumulates more sugar and less starch in the ear is consumed as a vegetable and is called sweet corn.
Immature maize shoots accumulate a powerful antibiotic substance, 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA). DIMBOA is a member of a group of hydroxamic acids (also known as benzoxazinoids) that serve as a natural defense against a wide range of pests, including insects, pathogenic fungi and bacteria. DIMBOA is also found in related grasses, particularly wheat. A maize mutant (bx) lacking DIMBOA is highly susceptible to be attacked by aphids and fungi. DIMBOA is also responsible for the relative resistance of immature maize to the European corn borer (family Crambidae). As maize matures, DIMBOA levels and resistance to the corn borer decline.
Because of its shallow roots, maize is susceptible to droughts, intolerant of nutrient-deficient soils, and prone to be uprooted by severe winds.[11]
Many forms of maize are used for food, sometimes classified as various subspecies related to the amount of starch each had:
- Flour corn — Zea mays var. amylacea
- Popcorn — Zea mays var. everta
- Dent corn — Zea mays var. indentata
- Flint corn — Zea mays var. indurata
- Sweet corn — Zea mays var. saccharata and Zea mays var. rugosa
- Waxy corn — Zea mays var. ceratina
- Amylomaize — Zea mays
- Pod corn — Zea mays var. tunicata Larrañaga ex A. St. Hil.
- Striped maize — Zea mays var. japonica
This system has been replaced (though not entirely displaced) over the last 60 years by multi-variable classifications based on ever more data. Agronomic data were supplemented by botanical traits for a robust initial classification, then genetic, cytological, protein and DNA evidence was added. Now, the categories are forms (little used), races, racial complexes, and recently branches.
Maize has 10 chromosomes (n=10). The combined length of the chromosomes is 1500 cM. Some of the maize chromosomes have what are known as "chromosomal knobs": highly repetitive heterochromatic domains that stain darkly. Individual knobs are polymorphic among strains of both maize and teosinte.
Barbara McClintock used these knob markers to validate her transposon theory of "jumping genes", for which she won the 1983 Nobel Prize in Physiology or Medicine. Maize is still an important model organism for genetics and developmental biology today.[12]
The Maize Genetics Cooperation Stock Center, funded by the USDA Agricultural Research Service and located in the Department of Crop Sciences at the University of Illinois at Urbana-Champaign, is a stock center of maize mutants. The total collection has nearly 80,000 samples. The bulk of the collection consists of several hundred named genes, plus additional gene combinations and other heritable variants. There are about 1000 chromosomal aberrations (e.g., translocations and inversions) and stocks with abnormal chromosome numbers (e.g., tetraploids). Genetic data describing the maize mutant stocks as well as myriad other data about maize genetics can be accessed at MaizeGDB, the Maize Genetics and Genomics Database.[13]
In 2005, the U.S. National Science Foundation (NSF), Department of Agriculture (USDA) and the Department of Energy (DOE) formed a consortium to sequence the B73 maize genome. The resulting DNA sequence data was deposited immediately into GenBank, a public repository for genome-sequence data. Sequences and genome annotations have also been made available throughout the project's lifetime at the project's official site, MaizeSequence.org.
Primary sequencing of the maize genome was completed in 2008.[14] On November 20, 2009, the consortium published results of its sequencing effort in Science.[15] The genome, 85% of which is composed of transposons, was found to contain 32,540 genes (By comparison, the human genome contains about 2.9 billion bases and 26,000 genes). Much of the maize genome has been duplicated and reshuffled by helitrons a group of rolling circle transposons.[16]
Maize breeding in prehistory resulted in large plants producing large ears. Modern breeding began with individuals who selected highly productive varieties in their fields and then sold seed to other farmers. James L. Reid was one of the earliest and most successful developing Reid's Yellow Dent in the 1860s. These early efforts were based on mass selection. Later breeding efforts included ear to row selection, (C. G. Hopkins ca. 1896), hybrids made from selected inbred lines (G. H. Shull, 1909), and the highly successful double cross hybrids using 4 inbred lines (D. F. Jones ca. 1918, 1922). University supported breeding programs were especially important in developing and introducing modern hybrids. (Ref Jugenheimer Hybrid Maize Breeding and Seed Production pub. 1958) by the 1930s, companies such as Pioneer devoted to production of hybrid maize had begun to influence long term development. Internationally important seed banks such as CIMMYT and the U.S. bank at Maize Genetics Cooperation Stock Center University of Illinois at Urbana-Champaign maintain germplasm important for future crop development.
Genetic modification
Main article: Transgenic maizeGenetically modified (GM) maize is one of the 11 GM crops grown commercially in 2009.[17] Grown since 1997 in the United States and Canada, 85% of the US maize crop was genetically modified in 2009. It is also grown commercially in Brazil, Argentina, South Africa, Canada, the Philippines, Spain and, on a smaller scale, in the Czech Republic, Portugal, Egypt and Honduras.[2]
Maize is the domesticated variant of teosinte.[18]The two plants have dissimilar appearance, maize having a single tall stalk with multiple leaves and teosinte being a short, bushy plant. The difference between the two is controlled by differences in just two genes.[18]
Several theories had been proposed about the specific origin of maize in Mesoamerica:[19][20]
- It is a direct domestication of a Mexican annual teosinte, Zea mays ssp. parviglumis, native to the Balsas River valley in south-eastern Mexico, with up to 12% of its genetic material obtained from Zea mays ssp. mexicana through introgression.
- It has been derived from hybridization between a small domesticated maize (a slightly changed form of a wild maize) and a teosinte of section Luxuriantes, either Z. luxurians or Z. diploperennis.
- It has undergone two or more domestications either of a wild maize or of a teosinte. (The term "teosinte" describes all species and subspecies in the genus Zea, excluding Zea mays ssp. mays.)
- It has evolved from a hybridization of Z. diploperennis by Tripsacum dactyloides.
In the late 1930s, Paul Mangelsdorf suggested that domesticated maize was the result of a hybridization event between an unknown wild maize and a species of Tripsacum, a related genus. This theory about the origin of maize has been refuted by modern genetic testing, which refutes Mangelsdorf's model and the fourth listed above.[19]:40
The teosinte origin theory was proposed by the Russian botanist Nikolai Ivanovich Vavilov in 1931 and the later American Nobel Prize-winner George Beadle in 1932.[19]:10 It is supported experimentally and by recent studies of the plants' genomes. Teosinte and maize are able to cross-breed and produce fertile offspring. A number of questions remain concerning the species, among them:
- how the immense diversity of the species of sect. Zea originated,
- how the tiny archaeological specimens of 3500–2700 BC could have been selected from a teosinte, and
- how domestication could have proceeded without leaving remains of teosinte or maize with teosintoid traits earlier than the earliest known until recently, dating from ca. 1100 BC.
The domestication of maize is of particular interest to researchers — archaeologists, geneticists, ethnobotanists, geographers, etc. The process is thought by some to have started 7,500 to 12,000 years ago. Research from the 1950s to 1970s originally focused on the hypothesis that maize domestication occurred in the highlands between Oaxaca and Jalisco, because the oldest archaeological remains of maize known at the time were found there. Genetic studies led by John Doebley identified Zea mays ssp. parviglumis, native to the Balsas River valley and also known as Balsas teosinte, as being the crop wild relative teosinte genetically most similar to modern maize.[21] However, archaeobotanical studies published in 2009 now point to the lowlands of the Balsas River valley, where stone milling tools with maize residue have been found in a 8,700-years old layer of deposits.[22][23][24] Some of the earliest pollen remains from Latin America have been found in lake sediments from tropics of southern Mexico and upper Central America, up to Laguna Martinez and have been radiocarbon dated to around 4,700 years ago.[citation needed] Archaeological remains of early maize ears, found at Guila Naquitz Cave in the Oaxaca Valley, date back roughly 6,250 years; the oldest ears from caves near Tehuacan, Puebla, date ca. 2750 BC. Little change occurred in ear form until ca. 1100 BC when great changes appeared in ears from Mexican caves: maize diversity rapidly increased and archaeological teosinte was first deposited.
Perhaps as early as 1500 BC, maize began to spread widely and rapidly. As it was introduced to new cultures, new uses were developed and new varieties selected to better serve in those preparations. Maize was the staple food, or a major staple (along with squash, Andean region potato, quinoa, beans, and amaranth), of most pre-Columbian North American, Mesoamerican, South American, and Caribbean cultures. The Mesoamerican civilization was strengthened upon the field crop of maize; through harvesting it, its religious and spiritual importance and how it impacted their diet. Maize formed the Mesoamerican people's identity. During the 1st millennium AD, maize cultivation spread from Mexico into the U.S. Southwest and during the following millennium into the U.S. Northeast and southeastern Canada, transforming the landscape as Native Americans cleared large forest and grassland areas for the new crop.[citation needed]
It is unknown what precipitated its domestication, because the edible portion of the wild variety is too small and hard to obtain to be eaten directly, as each kernel is enclosed in a very hard bivalve shell. However, George Beadle demonstrated that the kernels of teosinte are readily "popped" for human consumption, like modern popcorn. Some have argued that it would have taken too many generations of selective breeding to produce large, compressed ears for efficient cultivation. However, studies of the hybrids readily made by intercrossing teosinte and modern maize suggest this objection is not well founded.
In 2005, research by the USDA Forest Service indicated the rise in maize cultivation 500 to 1,000 years ago in what is now the southeastern United States contributed to the decline of freshwater mussels, which are very sensitive to environmental changes.[25]
Because it is cold-intolerant, in the temperate zones maize must be planted in the spring. Its root system is generally shallow, so the plant is dependent on soil moisture. As a C4 plant (a plant that uses C4 carbon fixation), maize is a considerably more water-efficient crop than C3 plants (plants that use C3 carbon fixation) like the small grains, alfalfa and soybeans. Maize is most sensitive to drought at the time of silk emergence, when the flowers are ready for pollination. In the United States, a good harvest was traditionally predicted if the maize was "knee-high by the Fourth of July", although modern hybrids generally exceed this growth rate. Maize used for silage is harvested while the plant is green and the fruit immature. Sweet corn is harvested in the "milk stage", after pollination but before starch has formed, between late summer and early to mid-autumn. Field maize is left in the field very late in the autumn to thoroughly dry the grain, and may, in fact, sometimes not be harvested until winter or even early spring. The importance of sufficient soil moisture is shown in many parts of Africa, where periodic drought regularly causes famine by causing maize crop failure.
Maize was planted by the Native Americans in hills, in a complex system known to some as the Three Sisters. Maize provided support for beans, and the beans provided nitrogen derived from nitrogen-fixing rhizobia bacteria which live on the roots of beans and other legumes; and squashes provided ground cover to stop weeds and inhibit evaporation by providing shade over the soil. This method was replaced by single species hill planting where each hill 60–120 cm (2.0–3.9 ft) apart was planted with three or four seeds, a method still used by home gardeners. A later technique was "checked maize", where hills were placed 40 inches (1.0 metre) apart in each direction, allowing cultivators to run through the field in two directions. In more arid lands, this was altered and seeds were planted in the bottom of 10–12 cm (3.9–4.7 in) deep furrows to collect water. Modern technique plants maize in rows which allows for cultivation while the plant is young, although the hill technique is still used in the maize fields of some Native American reservations.
In North America, fields are often planted in a two-crop rotation with a nitrogen-fixing crop, often alfalfa in cooler climates and soybeans in regions with longer summers. Sometimes a third crop, winter wheat, is added to the rotation.
Many of the maize varieties grown in the United States and Canada are hybrids. Often the varieties have been genetically modified to tolerate glyphosate or to provide protection against natural pests. Glyphosate (trade name Roundup) is an herbicide which kills all plants except those with genetic tolerance. This genetic tolerance is very rarely found in nature.
In midwestern United States, low-till or no-till farming techniques are usually used. In low-till, fields are covered once, maybe twice, with a tillage implement either ahead of crop planting or after the previous harvest. The fields are planted and fertilized. Weeds are controlled through the use of herbicides, and no cultivation tillage is done during the growing season. This technique reduces moisture evaporation from the soil and thus provides more moisture for the crop. The technologies mentioned in the previous paragraph enable low-till and no-till farming. Weeds compete with the crop for moisture and nutrients, making them undesirable.
Before World War II, most maize in North America was harvested by hand (as it still is in most of the other countries where it is grown). This involves a large numbers of workers and associated social events (husking or shucking bees). Some one- and two-row mechanical pickers were in use, but the maize combine was not adopted until after the War. By hand or mechanical picker, the entire ear is harvested, which then requires a separate operation of a maize sheller to remove the kernels from the ear. Whole ears of maize were often stored in corn cribs, and these whole ears are a sufficient form for some livestock feeding use. Few modern farms store maize in this manner. Most harvest the grain from the field and store it in bins. The combine with a maize head (with points and snap rolls instead of a reel) does not cut the stalk; it simply pulls the stalk down. The stalk continues downward and is crumpled in to a mangled pile on the ground. The ear of maize is too large to pass between slots in a plate as the snap rolls pull the stalk away, leaving only the ear and husk to enter the machinery. The combine separates out the husk and the cob, keeping only the kernels.
Maize is widely cultivated throughout the world, and a greater weight of maize is produced each year than any other grain.[citation needed] The United States produces 40% of the world's harvest; other top producing countries include China, Brazil, Mexico, Indonesia, India, France and Argentina. Worldwide production was 817 million tonnes in 2009—more than rice (678 million tonnes) or wheat (682 million tonnes).[26] In 2009, over 159 million hectares (390 million acres) of maize were planted worldwide, with a yield of over 5 tonnes/hectare (80 bu/acre). Production can be significantly higher in certain regions of the world; 2009 forecasts for production in Iowa were 11614 kg/ha (185 bu/acre).[27][Note 2] There is conflicting evidence to support the hypothesis that maize yield potential has increased over the past few decades. This suggests that changes in yield potential are associated with leaf angle, lodging resistance, tolerance of high plant density, disease/pest tolerance, and other agronomic traits rather than increase of yield potential per individual plant.[28]
Top ten maize producers in 2009 Country Production (tonnes) Note United States 333,010,910 China 163,118,097 Brazil 51,232,447 Mexico 20,202,600 Indonesia 17,629,740 India 17,300,000 France 15,299,900 Argentina 13,121,380 South Africa 12,050,000 Ukraine 10,486,300 World 817,110,509 [A] No symbol = official figure, A = Aggregate (may include official, semiofficial or estimates).[26] United States
In 2010, the maize planted area for all purposes in the US was estimated at 35 million hectares (87.9 million acres),[29] following an increasing trend since 2008.[30] About 14% of the harvested corn area is irrigated.[31]
- Corn earworm (Helicoverpa zea)
- Fall armyworm (Spodoptera frugiperda)
- Common armyworm (Pseudaletia unipuncta)
- Stalk borer (Papaipema nebris)
- Corn leaf aphid (Rhopalosiphum maidis)
- European corn borer (Ostrinia nubilalis) (ECB)
- Corn silkfly (Euxesta stigmatis)
- Lesser cornstalk borer (Elasmopalpus lignosellus)
- Corn delphacid (Peregrinus maidis)
- Western corn rootworm (Diabrotica virgifera virgifera LeConte)
- Southwestern corn borer (Diatraea grandiosella)
- Maize weevil (Sitophilus zeamais)
The susceptibility of maize to the European corn borer, and the resulting large crop losses, led to the development of transgenics expressing the Bacillus thuringiensis toxin. "Bt maize" is widely grown in the United States and has been approved for release in Europe.
Main article: List of maize diseases- Common Rust caused by Puccinia sorghi[32]
- Corn smut or common smut (Ustilago maydis): a fungal disease, known in Mexico as huitlacoche, which is prized by some as a gourmet delicacy in itself
- Northern leaf blight
- Southern leaf blight
- Maize dwarf mosaic virus
- Maize streak virus
- Stewart's wilt (Pantoea stewartii)
- Common rust (Puccinia sorghi)
- Goss's wilt (Clavibacter michiganese)
- Grey leaf spot
- Mal de Río Cuarto virus (MRCV)
- Stalk rot
- Ear rot
Human food
Maize and cornmeal (ground dried maize) constitute a staple food in many regions of the world. Introduced into Africa by the Portuguese in the 16th century, maize has become Africa's most important staple food crop.[33] Maize meal is made into a thick porridge in many cultures: from the polenta of Italy, the angu of Brazil, the mămăligă of Romania, to cornmeal mush in the U.S. (and hominy grits in the South) or the food called mealie pap in South Africa and sadza, nshima and ugali in other parts of Africa. Maize meal is also used as a replacement for wheat flour, to make cornbread and other baked products. Masa (cornmeal treated with lime water) is the main ingredient for tortillas, atole and many other dishes of Mexican food.
Popcorn consists of kernels of certain varieties that explode when heated, forming fluffy pieces that are eaten as a snack. Roasted dried maize cobs with semihardened kernels, coated with a seasoning mixture of fried chopped spring onions with salt added to the oil, is a popular snack food in Vietnam. Cancha, which are roasted maize chulpe kernels, are a very popular snack food in Peru, and also appears in traditional Peruvian ceviche. An unleavened bread called makki di roti is a popular bread eaten in the Punjab region of India and Pakistan.
Chicha and chicha morada (purple chicha) are drinks typically made from particular types of maize. The first one is fermented and alcoholic, the second is a soft drink commonly drunk in Peru. Corn flakes are a common breakfast cereal in North America and the United Kingdom, and found in many other countries all over the world.
Maize can also be prepared as hominy, in which the kernels are soaked with lye in a process called nixtamalization; or grits, which are coarsely ground hominy. These are commonly eaten in the Southeastern United States, foods handed down from Native Americans, who called the dish sagamite.
The Brazilian dessert canjica is made by boiling maize kernels in sweetened milk. Maize can also be harvested and consumed in the unripe state, when the kernels are fully grown but still soft. Unripe maize must usually be cooked to become palatable; this may be done by simply boiling or roasting the whole ears and eating the kernels right off the cob. Sweet corn, a genetic variety that is high in sugars and low in starch, is usually consumed in the unripe state. Such corn on the cob is a common dish in the United States, Canada, United Kingdom, Cyprus, some parts of South America, and the Balkans, but virtually unheard of in some European countries. Corn on the cob was hawked on the streets of early 19th-century New York City by poor, barefoot "Hot Corn Girls", who were thus the precursors of hot dog carts, churro wagons, and fruit stands seen on the streets of big cities today.[34] The cooked, unripe kernels may also be shaved off the cob and served as a vegetable in side dishes, salads, garnishes, etc. Alternatively, the raw unripe kernels may also be grated off the cobs and processed into a variety of cooked dishes, such as maize purée, tamales, pamonhas, curau, cakes, ice creams, etc.
Sweetcorn, yellow, raw
(seeds only)Nutritional value per 100 g (3.5 oz) Energy 360 kJ (86 kcal) Carbohydrates 19.02 g - Sugars 3.22 g - Dietary fiber 2.7 g Fat 1.18 g Protein 3.22 g - Tryptophan 0.023 g - Threonine 0.129 g - Isoleucine 0.129 g - Leucine 0.348 g - Lysine 0.137 g - Methionine 0.067 g - Cystine 0.026 g - Phenylalanine 0.150 g - Tyrosine 0.123 g - Valine 0.185 g - Arginine 0.131 g - Histidine 0.089 g - Alanine 0.295 g - Aspartic acid 0.244 g - Glutamic acid 0.636 g - Glycine 0.127 g - Proline 0.292 g - Serine 0.153 g Water 75.96 g Vitamin A equiv. 9 μg (1%) - lutein and zeaxanthin 644 μg Thiamine (vit. B1) 0.200 mg (17%) Niacin (vit. B3) 1.700 mg (11%) Vitamin B6 0.6 mg (46%) Folate (vit. B9) 46 μg (12%) Vitamin C 6.8 mg (8%) Iron 0.52 mg (4%) Magnesium 37 mg (10%) Potassium 270 mg (6%) One ear of medium size (6-3/4" to 7-1/2" long)
maize has 90 grams of seeds
Percentages are relative to US recommendations for adults.
Source: USDA Nutrient DatabaseMaize is a major source of starch. Cornstarch (maize flour) is a major ingredient in home cooking and in many industrialized food products. Maize is also a major source of cooking oil (corn oil) and of maize gluten. Maize starch can be hydrolyzed and enzymatically treated to produce syrups, particularly high fructose corn syrup, a sweetener; and also fermented and distilled to produce grain alcohol. Grain alcohol from maize is traditionally the source of Bourbon whiskey. Maize is sometimes used as the starch source for beer. Within the United States, the usage of maize for human consumption constitutes about 1/40th of the amount of grown in the country. In the United States and Canada, maize is mostly grown to feed for livestock, as forage, silage (made by fermentation of chopped green cornstalks), or grain. Maize meal is also a significant ingredient of some commercial animal food products, such as dog food.
Maize is also used as a fish bait, called "dough balls". It is particularly popular in Europe for coarse fishing.
Alternative medicine
Stigmas from female maize flowers, popularly called corn silk, are sold as herbal supplements.
Starch from maize can also be made into plastics, fabrics, adhesives, and many other chemical products.
The corn steep liquor, a plentiful watery byproduct of maize wet milling process, is widely used in the biochemical industry and research as a culture medium to grow many kinds of microorganisms.[35]
See also: Corn ethanol"Feed maize" is being used increasingly for heating;[citation needed] specialized corn stoves (similar to wood stoves) are available and use either feed maize or wood pellets to generate heat. Maize cobs are also used as a biomass fuel source. Maize is relatively cheap and home-heating furnaces have been developed which use maize kernels as a fuel. They feature a large hopper that feeds the uniformly sized maize kernels (or wood pellets or cherry pits) into the fire.
Maize is increasingly used as a feedstock for the production of ethanol fuel.[citation needed] Ethanol is mixed with gasoline to decrease the amount of pollutants emitted when used to fuel motor vehicles. High fuel prices in mid 2007 led to higher demand for ethanol, which in turn lead to higher prices paid to farmers for maize. This led to the 2007 harvest being one of the most profitable maize crops in modern history for farmers. Because of the relationship between fuel and maize, prices paid for the crop now tend to track the price of oil.[citation needed]
The price of food is affected to a certain degree by the use of maize for biofuel production. The cost of transportation, production, and marketing are a large portion (80%) of the price of food in the United States. Higher energy costs affect these costs, especially transportation. The increase in food prices the consumer has been seeing is mainly due to the higher energy cost. The effect of biofuel production on other food crop prices is indirect. Use of maize for biofuel production increases the demand, and therefore price of maize. This, in turn, results in farm acreage being diverted from other food crops to maize production. This reduces the supply of the other food crops and increases their prices.[36][37]
Maize is widely used in Germany as a feedstock for biogas plants. Here the maize is harvested, shredded then placed in silage clamps from which it is fed into the biogas plants. This process makes use of the whole plant rather than simply using the kernels as in the production of fuel ethanol.
A biomass gasification power plant in Strem near Güssing, Burgenland, Austria, began in 2005. Research is being done to make diesel out of the biogas by the Fischer Tropsch method.
Increasingly, ethanol is being used at low concentrations (10% or less) as an additive in gasoline (gasohol) for motor fuels to increase the octane rating, lower pollutants, and reduce petroleum use (what is nowadays also known as "biofuels" and has been generating an intense debate regarding the human beings' necessity of new sources of energy, on the one hand, and the need to maintain, in regions such as Latin America, the food habits and culture which has been the essence of civilizations such as the one originated in Mesoamerica; the entry, January 2008, of maize among the commercial agreements of NAFTA has increased this debate, considering the bad labor conditions of workers in the fields, and mainly the fact that NAFTA "opened the doors to the import of maize from the United States, where the farmers who grow it receive multimillion dollar subsidies and other government supports. (...) According to OXFAM UK, after NAFTA went into effect, the price of maize in Mexico fell 70% between 1994 and 2001. The number of farm jobs dropped as well: from 8.1 million in 1993 to 6.8 million in 2002. Many of those who found themselves without work were small-scale maize growers.").[38] However, introduction in the northern latitudes of the U.S. of tropical maize for biofuels, and not for human or animal consumption, may potentially alleviate this.
As a result of the U.S. federal government announcing its production target of 35 billion US gallons (130,000,000 m3) of biofuels by 2017, ethanol production will grow to 7 billion US gallons (26,000,000 m3) by 2010, up from 4.5 billion in 2006, boosting ethanol's share of maize demand in the U.S. from 22.6 percent to 36.1 percent.[39]
Ornamental and other uses
Main article: Corn constructionSome forms of the plant are occasionally grown for ornamental use in the garden. For this purpose, variegated and colored leaf forms as well as those with colorful ears are used. Size-superlative types, having reached 34 ft (10 m) tall, cobs 2 ft (61 cm) long, or 1 in (2.5 cm) kernels, have been popular for at least a century.[40][41] Corncobs can be hollowed out and treated to make inexpensive smoking pipes, first manufactured in the United States in 1869.
An unusual use for maize is to create a "corn maze" (or "maize maze") as a tourist attraction. The idea of a maize maze was introduced by Adrian Fisher, one of the most prolific designers of modern mazes, with The American Maze Company who created a maze in Pennsylvania in 1993. Traditional mazes are most commonly grown using yew hedges, but these take several years to mature. The rapid growth of a field of maize allows a maze to be laid out using GPS at the start of a growing season and for the maize to grow tall enough to obstruct a visitor's line of sight by the start of the summer. In Canada and the U.S., these are popular in many farming communities.
Maize kernels can be used in place of sand in a sandboxlike enclosure for children's play.[42]
Additionally, feed corn is sometimes used by hunters to bait animals such as deer or wild hogs.
Maize makes a greater quantity of epigeous mass than other cereal plants, so can be used for fodder. Digestibility and palatability are higher when ensiled and fermented, rather than dried.
Maize is bought and sold by investors and price speculators as a tradable commodity using corn futures contracts. These "futures" are traded on the Chicago Board of Trade (CBOT) under ticker symbol C. They are delivered every year in March, May, July, September, and December.[43]
U.S. usage breakdown
The breakdown of usage of the 12.1 billion bushel 2008 U.S. maize crop was as follows, according to the World Agricultural Supply and Demand Estimates Report by the USDA.[44]
- 5,250 million bu. - livestock feed
- 3,650 million bu. - ethanol production
- 1,850 million bu. - exports
- 943 million bu. - production of starch, corn oil, sweeteners (HFCS,etc.)
- 327 million bu. - human consumption - grits, corn flour, corn meal, beverage alcohol
Comparison to other staple foods
Synopsis[45] of
Staple food ~composition:Amaranth
[Note 3]Wheat
[Note 4]Rice
[Note 5]Corn flour
[Note 6]Sweetcorn
[Note 7]Potato
[Note 8]Component (per 100g portion) Amount Amount Amount Amount Amount Amount water (g) 11 11 12 11 76 82 energy (J) 1554 1506 1527 1510 360 288 protein (g) 14 23 7 6.9 3 1.7 fat (g) 7 10 1 3.8 1 0.1 carbohydrates (g) 65 52 79 77 19 16 fiber (g) 7 13 1 7.3 3 2.4 sugars (g) 1.7 0.1 >0.1 0.6 3 1.2 iron (mg) 7.6 6.3 0.8 2.4 0.5 0.5 manganese (mg) 3.4 13.3 1.1 0.5 0.2 0.1 calcium (mg) 159 39 28 7 2 9 magnesium (mg) 248 239 25 93 37 21 phosphorus (mg) 557 842 115 272 89 62 potassium (mg) 508 892 115 315 270 407 zinc (mg) 2.9 12.3 1.1 1.7 0.5 0.3 panthothenic acid (mg) 1.5 0.1 1.0 0.7 0.7 0.3 vitB6 (mg) 0.6 1.3 0.2 0.4 0.1 0.2 folate (µg) 82 281 8 25 42 18 thiamin (mg) 0.1 1.9 0.1 0.2 0.2 0.1 riboflavin (mg) 0.2 0.5 >0.1 0.1 0.1 >0.1 niacin (mg) 0.9 6.8 1.6 1.9 1.8 1.1 Hazards
Main article: PellagraWhen maize was first introduced into farming systems other than those used by traditional native-American peoples, it was generally welcomed with enthusiasm for its productivity. However, a widespread problem of malnutrition soon arose wherever maize was introduced as a staple food. This was a mystery, since these types of malnutrition were not normally seen among the indigenous Americans, for whom maize was the principal staple food.[46]
It was eventually discovered that the indigenous Americans had learned to soak maize[citation needed] in alkali-water—made with ashes and lime (calcium oxide) by Mesoamericans and North Americans—which liberates the B-vitamin niacin, the lack of which was the underlying cause of the condition known as pellagra. This alkali process is known by its Nahuatl (Aztec)-derived name: nixtamalization. Besides the lack of niacin, pellagra was also characterized by protein deficiency, a result of the inherent lack of two key amino acids in pre-modern maize, lysine and tryptophan. Nixtamalisation was also found to increase the availability of lysine and tryptophan to some extent, but more importantly, the indigenous Americans had also learned to balance their consumption of maize with beans and other protein sources such as amaranth and chia, as well as meat and fish, to acquire the complete range of amino acids for normal protein synthesis.
Maize was introduced into the diet of nonindigenous Americans without the necessary cultural knowledge acquired over thousands of years in the Americas. In the late 19th century, pellagra reached epidemic proportions in parts of the southern U.S., as medical researchers debated two theories for its origin: the deficiency theory (which was eventually shown to be true) said that pellagra was due to a deficiency of some nutrient, and the germ theory said that pellagra was caused by a germ transmitted by stable flies. In 1914, the U.S. government officially endorsed the germ theory of pellagra, but rescinded this endorsement several years later when the evidence grew against it. By the mid-1920s, the deficiency theory of pellagra was becoming scientific consensus, and the theory was validated in 1932 when niacin deficiency was determined to be the cause of the illness.
Once alkali processing and dietary variety were understood and applied, pellagra disappeared in the developed world. The development of high lysine maize and the promotion of a more balanced diet has also contributed to its demise. Pellagra still exists today in food-poor areas and refugee camps where people survive on donated maize.[47]
Maize contains lipid transfer protein, an indigestible protein that survives cooking. This protein has been linked to a rare and understudied allergy to maize in humans.[48] The allergic reaction can cause skin rash, swelling or itching of mucous membranes, diarrhea, vomiting, asthma and, in severe cases, anaphylaxis. It is unclear how common this allergy is in the general population.
Maize has been an essential crop in the Andes since the pre-Columbian Era. The Moche culture from Northern Peru made ceramics from earth, water, and fire. This pottery was a sacred substance, formed in significant shapes and used to represent important themes. Maize represented anthropomorphically as well as naturally.[49]
In the United States, maize ears along with tobacco leaves are carved into the capitals of columns in the U.S. Capitol building. Maize itself is sometimes used for temporary architectural detailing when the intent is to celebrate the fall season, local agricultural productivity and culture. Bundles of dried maize stalks are often displayed often along with pumpkins, gourds and straw in autumnal displays outside homes and businesses. A well-known example of architectural use is the Corn Palace in Mitchell, South Dakota, which uses cobs of colored maize to implement a mural design that is recycled annually.
A maize stalk with two ripe ears is depicted on the reverse of the Croatian 1 lipa coin, minted since 1993.[50]
Popular culture
- Children of the Corn, a 1977 horror short story by Stephen King (later made into a 1984 film with various sequels), is about a maize field-dwelling deity who commands the children in the town to sacrifice all of the town's adults to it.
- Cornman: American Vegetable Hero is a 2001 cult movie was about a loser who gets doused with toxic sludge from a maize field and develops the ability to communicate with ears of maize.
- Field of Dreams, a 1989 American drama-sports-fantasy film starring Kevin Costner, is about a maize farmer who plows his maize field to build a baseball diamond to host long-dead baseball players from the 1919 Chicago Black Sox.
- King Corn is a 2007 documentary about two college friends who grow an acre of Iowa maize and learn about where it will end up
- KoЯn is a popular nu metal band named after the American term for maize[51]
See also
- Hominy
- List of sweetcorn varieties
- MildDisc
- Post-harvest losses (Grains)
- Protein per unit area
- Push–pull technology, pest control strategy for maize and sorghum
- Sagamite
- Starch
- Transgenic maize
- Zein
- ^ The growers industry body for the crop in Australia is the Maize Association of Australia, for example, and "maize" is used by government agricultural bodies and research institutes such as the CSIRO. This usage is replicated among the English-speaking countries of Africa. For example, Kenya has the Kenya Maize Consortium and Maize Breeders Network, Nigeria the National Maize Association of Nigeria, Zimbabwe the Zimbabwe Seed Maize Association, and South Africa the Maize Board, until its dissolution in the 1990s. Agricultural and farmers' federations in Burundi, Uganda, Botswana, Ghana, etc. all call it "maize", as do relevant industry bodies in the UK. In India, there is the Indian Maize Development Association. It is usually if not preferentially called 'maize' in FAO and other international agricultural organizations.
- ^ Calculated from 185 bushels per acre at USDA 25.4 kg per bushel.
- ^ Raw, uncooked
- ^ Germ, crude
- ^ White, long-grain,regular, raw, unenriched
- ^ whole-grain, yellow
- ^ Sweet, yellow, raw
- ^ White, flesh and skin, raw
- ^ "U.S. Approves Corn Modified for Ethanol". New York Times. February 11, 2011. http://www.nytimes.com/2011/02/12/business/12corn.html.
- ^ a b Genetically modified plants: Global Cultivation Area Maize GMO Compass, March 29, 2010, retrieved August 10, 2010
- ^ [1] cf. 2010. Tallest-Maize Data.
- ^ "Maize". The Oxford English Dictionary, online edition. December 2007. Accessed December 16, 2007.[2]
- ^ a b "Corn". The Oxford English Dictionary, online edition. 1989. Accessed December 16, 2007.[3]
- ^ http://dictionary.reference.com/browse/mielie
- ^ Gautam, P., Gustafson, DM, and Wicks III, Z. 2011. Phosphorus Concentration, Uptake and Dry Matter Yield of Corn Hybrids. World Journal of Agricultural Sciences 7(4): 418-424 [4]
- ^ [5][dead link] 2008. Maize is Not a Day-Neutral plant.
- ^ [6] 2008. Tallest Corn.
- ^ Tropical Maize for Biofuels
- ^ "Corn Stalk Lodging". Monsanto Imagine. 2008-10-02. http://www.dekalb.ca/content/pdf/corn_stalk_lodging.pdf. Retrieved 2009-02-23.
- ^ Brown, David (2009-11-20). "Scientists have high hopes for corn genome". Washington Post. http://www.washingtonpost.com/wp-dyn/content/article/2009/11/19/AR2009111903190.html.
- ^ MaizeGDB
- ^ Researchers sequence genome of maize, a key crop
- ^ The B73 Maize Genome: Complexity, Diversity, and Dynamics (Abstract)
- ^ Feschotte, C.; Pritham, E. (2009). "A cornucopia of Helitrons shapes the maize genome". Proceedings of the National Academy of Sciences 106 (47): 19747–19748. doi:10.1073/pnas.0910273106. PMC 2785235. PMID 19926864. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2785235.
- ^ Global Status of Commercialized Biotech/GM Crops: 2009 ISAAA Brief 41-2009, February 23, 2010, retrieved August 10, 2010
- ^ a b Corn genetics study
- ^ a b c Wilkes, Garrison (2004). "Chapter 1.1 Corn, strange and marvelous: but is a definitive origin known?". In Smith, C. Wayne; Runge; Betrán, Javier. Corn: Origin, History, Technology, and Production. Wiley. pp. 3–63. ISBN 978-0-471-41184-0.
- ^ Ordish, George; Hyams, Edward (1996). The last of the Incas: the rise and fall of an American empire. New York: Barnes & Noble. p. 26. ISBN 0-88029-595-3.
- ^ Doebley, J. F. (2004). "The genetics of maize evolution". Annual Review of Genetics 38: 37–59. doi:10.1146/annurev.genet.38.072902.092425. PMID 15568971. http://teosinte.wisc.edu/pdfs/DoebleyAnnRev2004.pdf.
- ^ "Wild grass became maize crop more than 8,700 years ago", National Science Foundation, News Release at Eurekalert March 24, 2009
- ^ Ranere, Anthony J., Dolores R. Piperno, Irene Holst, Ruth Dickau, José Iriarte (2009). "The cultural and chronological context of early Holocene maize and squash domestication in the Central Balsas River Valley, Mexico". Proceedings of the National Academy of Sciences 106 (13): 5014–5018. doi:10.1073/pnas.0812590106. PMC 2664064. PMID 19307573. http://www.pnas.org/content/106/13/5014.full.pdf.
- ^ Piperno, Dolores R., Anthony J. Ranere, Irene Holst, José Iriarte, Ruth Dickau (2009). "Starch grain and phytolith evidence for early ninth millennium B.P. maize from the Central Balsas River Valley, Mexico". Proceedings of the National Academy of Sciences 106 (13): 5019–5024. doi:10.1073/pnas.0812525106. PMC 2664021. PMID 19307570. http://www.pnas.org/content/106/13/5019.full.pdf.
- ^ Evan Peacock, Wendell R. Haag & Melvin L. Warren, Jr. (2005). "Prehistoric decline in freshwater mussels coincident with the advent of maize agriculture" (PDF). Conservation Biology 19 (2): 547–551. doi:10.1111/j.1523-1739.2005.00036.x. http://www.srs.fs.usda.gov/pubs/ja/ja_peacock001.pdf.
- ^ a b Food and Agriculture Organization of the United Nations, Statistics Division (2009). "Maize, rice and wheat : area harvested, production quantity, yield". http://faostat.fao.org/site/567/DesktopDefault.aspx?PageID=567.
- ^ "Iowa corn crop poised to set record". Cedar Rapids Gazette. 12 August 2009. http://gazetteonline.com/top-story/2009/08/12/iowa-corn-crop-poised-to-set-record.
- ^ Duvick, D. N. & Cassman, K. G. (1999). "Post-green-revolution trends in yield potential of temperate maize in the north-central United States". Crop Science 39 (6): 1622–1630. doi:10.2135/cropsci1999.3961622x. http://crop.scijournals.org/cgi/content/abstract/39/6/1622.
- ^ Acreage. USDA, National Agricultural Statistics Service. 30 June 2010. ISSN 1949–1522. Archived from the original on 2010-06-30. http://usda.mannlib.cornell.edu/usda/current/Acre/Acre-06-30-2010.txt. Retrieved 5 November 2010. "Corn planted area for all purposes in 2010 is estimated at 87.9 million acres"
- ^ National Corn Growers Association. "Corn Production Trends 1991–2009". http://www.ncga.com/corn-production-trends. Retrieved 5 November 2010.
- ^ "Irrigated Corn for Grain, Harvested Acres: 2002". 2002. http://www.nass.usda.gov/research/2002mapgallery/mediafiles/l3.jpg. Retrieved 5 November 2010. "United States total: 9,709,872"
- ^ Gautam, P. and Stein, J. 2011. Induction of Systemic Acquired Resistance to Puccinia sorghi in Corn. International Journal of Plant Pathology 2(1):43-50 [7]
- ^ "The cassava transformation in Africa". The Food and Agriculture Organization of the United Nations (FAO).
- ^ Solon Robinson. Hot Corn: Life Scenes in New York Illustrated (Series appearing in 1853 in the NY Tribune, later as a book)
- ^ Liggett, R. Winston; Koffler, H. (December 1948). "CORN STEEP LIQUOR IN MICROBIOLOGY". Bacteriological Reviews 12 (4): 297–311. PMC 180696. PMID 18101383. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=180696.
- ^ Christian Science Monitor
- ^ Iowa Renewable Fuels Association
- ^ Revista Envío - Are Free Trade Agreements Free? Are They Development Strategies?
- ^ IBISWorld
- ^ [8] 2007. The History Of The Jala Maize.
- ^ [9] 2008. (Cornnuts giant Cuzco maize) The Cornnuts Tall-Corn Contest.
- ^ "Maize Quest Fun Park: Corn Box". http://www.mazefunpark.com/attractions/details.php?attraction_id=5. Retrieved October 8, 2007.
- ^ CBOT Corn Futures Contract Overview via Wikinvest
- ^ "2009 US Corn Stats". Iowa Corn. http://www.iowacorn.org/User/Docs/2009%20US%20Corn%20Stats.pdf. Retrieved December 2, 2010.c
- ^ "The origins of maize: the puzzle of pellagra". EUFIC > Nutrition > Understanding Food. The European Food Information Council. December 2001. http://www.eufic.org/web/article.asp?cust=1&lng=en&sid=4&did=16&artid=103. Retrieved September 14, 2006.
- ^ Janice L. Thompson, Melinda M. Manore & Linda Ann Vaughan (2010). "Nutrients involved in energy metabolism". The Science of Nutrition (2nd ed.). San Francisco: Pearson Education. pp. 292–321. ISBN 978-0321643162.
- ^ Corn (maize) Allergy, InformAll Database, 18 October 2006
- ^ Berrin, Katherine & Larco Museum. The Spirit of Ancient Peru:Treasures from the Museo Arqueológico Rafael Larco Herrera. New York: Thames and Hudson, 1997.
- ^ Croatian National Bank. Kuna and Lipa, Coins of Croatia: 1 Lipa Coin. – Retrieved on 31 March 2009.
- ^ Arvizu, Reginald (2009-03-10). Got the Life: My Journey of Addiction, Faith, Recovery, and Korn. William Morrow. ISBN 0061662496.
- Aureliano Brandolni, Andrea Brandolini. Il mais in Italia: storia naturale e agricola XII+370 pages and 80 colour pages. CRF press. Bergamo, Italy, 2006.
- Ferro, D.N. and Weber, D.C. Managing Sweet Corn Pests in Massachusetts
External links
- "Tracking the Ancestry of Corn Back 9,000 Years," New York Times, May 25, 2010
- Crop Wild Relatives Gap Analysis Portal reliable information source on where and what to conserve ex-situ, regarding Zea genepool
- Growing Corn Information on the uses and starting of corn seed
- Zea mays at Plants For A Future
- Maize Genetics and Genomics Database project
- The Maize Genome Sequence Browser
- Corn at the Open Directory Project
- Zea mays, corn taxonomy, facts, life cycle, kernel anatomy at GeoChemBio.com
- Major topic "Zea mays": free full text articles in National Library of Medicine
- Paul Lunde, New World Foods, Old World Diet, 1992, Saudi Aramco World
- Data related to Zea mays at Wikispecies
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