Condensation with phenols gives phenol-formaldehyde resins. Alcohols, phenols and other similar compounds contain oxygen. The anaerobic decay products of amino acids, monosaccharides, phenols and aldehydes combined to fulvic acids. More complex alkylation of a alcohols and phenols involve ethoxylation. Grignard reagents are basic and react with alcohols, phenols, etc. Several enhancers can be used such as the commonly known modified phenols (mainly iodo-phenol). In the presence of oxidizing agents aldrin reacts with concentrated acids and phenols. Derived from aerobic oxidation of phenols, they are polymers. Alkylphenols are a family of organic compounds obtained by the alkylation of phenols. Many are well known for their production and accumulation of various halogenated phenols and pyrroles. The reaction is especially useful for aromatic reagents to give the corresponding phenols. Examples of persistent toxins are PCBs, DDT, TBT, pesticides, furans, dioxins, phenols, and radioactive waste. Pollutants generated by textile mills include BOD, SS, oil and grease, sulfide, phenols and chromium. This trick is applicable to molecules that have acidic hydrogen atoms, e.g. phenols. Tyrosine ammonia lyase (TAL) is an enzyme in the natural phenols biosynthesis pathway.