N -METHYL GROUPS IN BACTERIAL LIPIDS

n-cyclicizer groups

Bacterial fermentation of creatinine. I. Isolation of N-methyl-hydantoin.

Although creatinine is, other than urea, the most important nitrogenous end product excreted by many animals, very little is known about its metabolic pathway in soil bacteria. Some incomplete studies have been made by early workers (Ackerman, 1913, Linneweh, 1930), mostly with putrefactive bacteria, and they claimed to have identified, besides ammonia, methyl-hydantoin as an end product. Dubos...

Some properties of n-capable and n-perfect groups

In this article we introduce the notion of n-capable groups. It is shown that every group G admits a uniquely determined subgroup (〖Z^n)〗^* (G) which is a characteristic subgroup and lies in the n-centre subgroup of the group G. This is the smallest subgroup of G whose factor group is n-capable. Moreover, some properties of n-central extension will be studied.

Coupled methyl groups in dimethyl sulphide

Low field methyl tunnelling spectra of dimethyl sulphide have been measured using field cycling NMR and indicate the existence of two distinct methyl groups with tunnel. frequencies of 100kHz and 750kHz. Spectra show a significant broadening of the Larmor peak at those fields at which the Larmor and tunnel frequencies are equal. These are resonances between the rotational and spin dynamics of t...

Crystal structures of (N-methyl-N-phenyl­amino)(N-methyl-N-phenyl­carbamoyl)sulfide and the corresponding disulfane

The title compounds, (N-methyl-N-phenyl-amino)(N-methyl-N-phenyl-car-bam-oyl)sulfide, C15H16N2OS, (I), and (N-methyl-N-phenyl-amino)-(N-methyl-N-phenyl-carbamo-yl)disulfane, C15H16N2OS2, (II), are stable derivatives of (chloro-carbon-yl)sulfenyl chloride and (chloro-carbon-yl)disulfanyl chloride, respectively. The torsion angle about the S-S bond in (II) is -92.62 (6)°, which is close to the th...