diisopropylphosphofluoridate, reacts with a serine OH group in the active site of esterases such as acetylcholinesterase/chymotrypsin, whilst the organomercury compound p-hydroxymercuribenzoate reacts with a cysteine group, in both cases resulting in covalent bond formation and enzyme inhibition.

TLS Online TPP Program

#Id: 9570

#XL - T Zoology

Van Valen law -  he found a surprising result: rather straight curves, implying that the probability of extinction is roughly constant.

TLS Online TPP Program

#Id: 5353

#XL - T Zoology

Populations grow when R0 or λ>1, populations decline when R0 or λ<1, and are at equilibrium when R0 or λ=1

TLS Online TPP Program

#Id: 7931

#XL - Q Biochemistry

Microsomes

when cells are homogenized, the rough ER breaks up into small closed vesicles with ribosomes on the outside

TLS Online TPP Program

#Id: 9207

#XL - T Zoology

TLS Online TPP Program

#Id: 10756

#XL - R Botany

The flower

Perfect flowers have both an androecium and a gynoecium

Imperfect flowers have one or the other and are termed pistillate if they contain female reproductive structures or staminate if only male reproductive structures