OALib Journal期刊

ISSN: 2333-9721




2020 ( 243 )

2019 ( 515 )

2018 ( 643 )

2017 ( 645 )


匹配條件： “W.S. Grant” ，找到相關結果約387875條。
Description of electrophoretic loci and tissue specific gene expression in the horseshoe bat genus Rhinolophus (Rhinolophidae)
Sarita Maree,W.S. Grant
African Zoology , 2011,
Abstract: The number of loci encoding an enzyme system, tissue specificity of gene expression and the degree of gene expression in various tissues are often not mentioned in evolutionary studies, but could indirectly provide evidence of evolutionary relationships. Protein electrophoresis was used to study the distributions and tissue specificity of gene expression of enzymes encoded by 42 loci in Rhinolophus clivosus and R. landeri, the genetically most divergent of the ten species of southern African horseshoe bats. No differences in gene expression were found between R. clivosus and R. landeri and isozyme patterns may be compared with other bat species to derive possible phylogenetic relationships.
Phylogenetic relationships and call structure in four African bufonid species
M.I. Cherry,W.S. Grant
African Zoology , 2012,
Abstract: ENGLISH ABSTRACT: Four species of toads of the genus Bufo. comprising three species endemic to southern Africa and one closely-related species, were examined electrophoretically to infer their phylogenetic relationships. The evolution of advertisement call structure in these species is discussed in relation to this phylogeny. Bufo rangeri and B. gutturalis, two species with very different call structures, are sister taxa. Two pairs of species with very similar call structures, B. pardalis and B. gutturalis, and B. rangeri and B. angusticeps, were only distantly related. Our results suggest that call parameters are poor characters to use in inferring phylogenies among congeneric species, probably because of selection for optimal audibility in different habitats, and because of the role that they play in premating isolation. The phylogeny derived from allozyme data agrees with evidence on albumin immunological distance, karyotype and morphology. *********** AFRIKAANSE OPSOMMING: Vier spesies skurwepaddas van die genus Buto, bestaande uit drie wat endemies is in Suid-Afrika en een nou-verwante spesie, is elektroforeties ondersoek om hulle filogenetiese verwantskap af te lei. Die evolusie van die struktuur van die bekendstellingsroep by hierdie spesie word met betrekking tot hierdie filogenie bespreek. Buto rangeri en B. gutturalis, twee spesies met baie verskillende roepstrukture, is suster taksa. Twee pare van spesies met baie ooreenstemmende roepstrukture, B. pardalis en B. gutturalis, en B. rangeri en B. angusticeps, was slegs ver langs verwant. Ons resultate dui daarop dat roep-parameters swak kenmerke is om te gebruik by die aflei van filogenie by verwante spesies, waarskynlik as gevolg van seleksie wat plaasvind vir optimale hoorbaarheid in verskillende habitatte, sowel as die rol wat hulle speel by die pre-paringsisolasie. Die filogenie wat van allosiemdata afgelei is, stem ooreen met getuienis oor albumien immunologiese afstand, kariotipe en morfologie .
The reliability analysis of cutting tools in the HSM processes
W.S. Lin
Archives of Materials Science and Engineering , 2008,
The study of high speed fine turning of austenitic stainless steel
W.S. Lin
Journal of Achievements in Materials and Manufacturing Engineering , 2008,
MgO-Au cermet films
Gold Bulletin , 1978, DOI: 10.1007/BF03216527
The development of gold drugs
Gold Bulletin , 1981, DOI: 10.1007/BF03216736
Precipitation hardening and ordering of carat gold jewellery alloys
Gold Bulletin , 1978, DOI: 10.1007/BF03216531
W.S.W. Trollope
W.S.W. Trollope
漢景泰,W.S. Fyfe
科學通報 , 2000,
Abstract: 以鐵的硫化物礦折黃鐵礦和磁黃鐵礦為吸附材料，在實驗室條件下研究了它們對模型水體中的砷的吸附作用。在實驗觀測基礎上討論了這些礦物材料對砷的吸附速率和效率，吸附砷的穩定性以及穩定條件，提出這些礦物去除水體中砷的有效吸附材料，對于缺乏水質處理設備條件的地區有直接的實用價值。
