Tyrosinase shows kinetic cooperativity in its action on o-diphenols, but not when it acts on monophenols, confirming that the slow step is the hydroxylation of monophenols to o-diphenols. This model can be generalised to a wide range of substrates; for example, type S(A) substrates, which give rise to a stable product as the o-quinone evolves by means of a first or pseudo first order reaction (...

The crystal structures of four bromo-arenes based on 2,6-di-methyl-bromo-benzene are reported, which are differentiated according the functional group X placed para to the Br atom: X = CN (4-bromo-3,5-di-methyl-benzo-nitrile, C9H8BrN), (1), X = NO2 (2-bromo-1,3-dimethyl-5-nitro-benzene, C8H8BrNO2), (2), X = NH2 (4-bromo-3,5-di-methyl-aniline, C8H10BrN), (3) and X = OH (4-bromo-3,5-di-methyl-phe...

The volatile components of γ-aminobutyric acid (GABA) tea produced by two different kinds of technological process separately namely: vacuum and water immersion were studied. It was shown by the sensory evaluation that the color of the soup and the extracted leaves of GABA tea were similar to that of the oolong tea, and the smell was similar to the aroma of cooked sweet red dates mixed with som...

Reaction of trimethylaluminium with the linked bis(phenol) trans-1,4-dithiocyclohexanediyl-2,2-bis(4,6-di-tert-butylphenol) (cydtbpH2, 1a) led to the chiral methyl aluminium complex [Al(cydtbp)Me] (2a) as both racemate and resolved enantiomers, which were characterized by multinuclear NMR spectroscopy and elemental analysis. Rac-{trans-1,2-dithiocyclohexanediyl-2,2-bis(6-tert-butyl-4-methylphen...