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Reduced folate derivatives that contain additional hydrogen atoms in positions 5, 6, 7 and 8. Tetrahydrofolates are the carriers of activated one carbon units and are important in the biosynthesis of amino acids and precursors needed for DNA synthesis. See also folate coenzymes.
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thioaldehydes definition
Compounds in which the oxygen of an aldehyde has been replaced by divalent sulfur, RC(=S)H. NOC Rule C-531. E.g. CH3CH2C(=S)H propaneth
Therapeutic index definition
For a substance used to alleviate disease, pain or injury the therapeutic index is the ratio between toxic and therapeutic doses (the higher the ratio, the greater the safety of the therapeutic dose).
thioaldehyde S-oxides definition
Compounds having the structure RC(=S=O)H. NOC Rule C-633.2. (Also known by the disapproved term sulfines which includes thioaldehyde S-oxides and thioketone S-oxid
tetrapyrroles definition
Natural pigments containing four pyrrole rings joined by one-carbon units linking position 2 of one pyrrole ring to position 5 of the next. Porphyrins are macrocyclic tetrapyrroles. BNRD, Nomenclature of tetrapyrroles, introduction (p. 279). E.g....
time dilation definition
the idea that time travels slower for somebody in a moving reference frame; consequence of relativity.
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