The population imbalance between nuclear singlet states and triplet of strongly coupled spin-1/2 pairs, also known as order, is well protected against several common relaxation mechanisms. We study the 13C pairs in aqueous solutions 1,2-13C2 squarate over a range pH values. order accessed by introducing 18O nuclei to break chemical equivalence. dianion equilibrium with hydrogen-squarate (SqH?) ...

Dissociation of superoxide dismutase 1 dimers is enhanced by glutathionylation, although the dissociation constants reported to date are imprecise. We have quantified the discreet dissociation constants for wild-type superoxide dismutase 1 and six naturally occurring sequence variants, in their unmodified and glutathionylated forms, at the ratios expressed. Unmodified superoxide dismutase 1 var...

calix(6)arene hydroxamic acids (iii) are synthesised for the first time by reactingcalix(6)arene acid chloride(ii) with substituted hydroxylamines at low temperature in the presence ofsodium bicarbonate. the p-carboxycalix(6)arene(i) is obtained by an acid catalysed condensationreaction of p-hydroxybenzoic acid and formaldehyde. these calixarenes are characterised by meltingpoint, uv, ir, 1h nm...