Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Roger Hollenstein"'
Publikováno v:
European Journal of Biochemistry. 214:515-519
Oxidation of enzyme-substrate carbanion intermediates by extrinsic oxidants may result in irreversible paracatalytic inactivation of certain enzymes. In paracatalytically modified fructose-1,6-bisphosphate aldolase from rabbit muscle the polypeptide
Autor:
Roger Hollenstein, Erhard Stupperich
Publikováno v:
Helvetica Chimica Acta. 76:1258-1265
The 15N-NMR spectra of vitamin B12 analogues obtained in fully 15N-labelled form have been measured by direct and inverse (15N, 1H) correlated spectroscopy. All resonances, except those of the NH2 groups, have been assigned to individual N-atoms. The
Publikováno v:
Helvetica Chimica Acta. 66:1748-1754
The 1-deoxy-1-nitro-D-manno-pyranose 4 was transformed into the nitroolefin 5 and hence into the anomeric 1,2-dideoxy-1-nitro-3, 4, 6-tri-O-benzyl-D-arabino-hexopyranoses (3a and 3b; cf. the Scheme). Conformational analysis of 1-benzyloxy-2-nitroetha
Publikováno v:
Biochemistry. 27:7163-7166
The formation of two metal-thiolate clusters in rabbit liver metallothionein 2 (MT) has been examined by /sup 113/Cd NMR spectroscopy at pH 7.2 and 8.6. The chemical shifts of the /sup 113/Cd resonances developing in the course of apoMT titration wit
Publikováno v:
Helvetica Chimica Acta. 71:521-530
15N-Labelled 3-(Dimethylamino)-2,2-dimethyl-2H-azirine for Mechanistic Studies of Reactions with NH-Acidic Heterocycles The synthesis of 3-(dimethylamino)-2,2-dimethyl(1-15N)-2H-azirine (1*) was accomplished via reaction of 1-chloro-N,N,2-trimethyl-1
Publikováno v:
Helvetica Chimica Acta. 60:948-958
The structures of cyclic polyketones, their hydrates and reduction products were studied in different solvents by 13C-NMR. spectroscopy. In dimethylsulfoxide solution rhodizonic acid (1), croconic acid (2) and squaric acid (3) exhibit signal averagin
Autor:
Roger Hollenstein, W. von Philipsborn
Publikováno v:
Helvetica Chimica Acta. 55:2030-2044
Carbon-13 spectra of a series of 26 unsaturated ketones (ortho- and para-cyclo-hexadienones and corresponding open-chain analogues) have been measured by Fourier-transform. Pulse spectroscopy. A complete analysis has been achieved by means of double
Publikováno v:
Helvetica Chimica Acta. 56:847-860
Carbon-13 and proton NMR. spectra of pentafulvene and of a series of 6-substituted fulvenes have been analysed and assigned by homo- and heteronuclear double resonance and with the aid of iterative computation. 13C and 1H chemical shifts are interpre
Publikováno v:
Chemischer Informationsdienst. 8
Autor:
Roger Hollenstein, Fumio Satoh, Alan R. Battersby, Masataka Ihara, Edward McDonald, D. Clive Williams
Publikováno v:
Journal of the Chemical Society. Perkin transactions 1. 2
A broken-cell enzyme system is developed from Propionibacterium shermanii which converts porphobilinogen into cobyrinic acid in 7–12% yields. This system is used to demonstrate incorporation of unsymmetrically labelled uroporphyrinogen III (7) into