Detail of "1824-94-8"

Reference

Effect of uncoupler on "downhill" substrate efflux of Escherichia coli is dependent on (magnesium, calcium ion)-stimulated adenosine triphosphatase

Effect of uncoupler on "downhill" substrate efflux of Escherichia coli is dependent on (magnesium, calcium ion)-stimulated adenosine triphosphatase. Rotman, Boris (Div. Biol. Med. Sci., Brown Univ., Providence, R. I., USA). J. Cell. Physiol., 89(4), 561-6 (English) 1976. 615-58-7 and 370-86-5 which are cas registry numbers are also used here. CODEN: JCLLAX. DOCUMENT TYPE: Journal CA Section: 3 (Biochemical Interactions) The uncoupler 2,4-dinitrophenol [51-28-5] inhibited the efflux of methyl .beta.-D-galactopyranoside [1824-94-8] from E. coli cells, but failed to inhibit the efflux from a unc- mutant defective in energy transduction and in a membrane-bound, Ca2+-Mg2+-activated ATPase [9000-83-3]. Thus, the inhibitory effect of dinitrophenol on substrate efflux apparently required the presence of a functional unc gene. In contrast to dinitrophenol, other uncouplers either had no effect or enhanced the rate of efflux in unc+ strains. Since all of these uncouplers blocked active transport of methyl .beta.-D-galactopyranoside the downhill transport from inside to the outside of the membrane differs from the influx mechanism in at least one component. .

Harmonic dynamics of a- and b-methyl-D-galactopyranoside in the crystalline state

Harmonic dynamics of a- and b-methyl-D-galactopyranoside in the crystalline state. Sekkal, N.; Taleb-Mokhtari, I. N.; Sekkal-Rahal, M. 1824-94-8 and 34004-14-3 are also occured in this study.; Bleckmann, P.; Vergoten, G. (Faculte des Sciences, Departement de chimie, Universite Djillali Liabes de Sidi Bel Abbes, Sidi Bel Abbes 22000, Algeria). Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy, 59A(12), 2883-2896 (English) 2003 Elsevier Science B.V. CODEN: SAMCAS. ISSN: 1386-1425. DOCUMENT TYPE: Journal CA Section: 33 (Carbohydrates) Section cross-reference(s): 22, 75 The study of the anomeric differences obsd. on the spectra of methyl-a- and methyl-b-D-galactopyranoside is the essential goal of this investigation. Thus, after a careful examn. of the IR and Raman spectra of these two compds., several differences in the intensities and frequency shifts are obsd. This is esp. noted in the region 1000-700 cm-1. In order to make some assignments with more precision, the normal modes analyses of the two compds. are performed in the cryst. state. For this purpose, a modified Urey-Bradley-Shimanouchi force field has been combined with an intermol. potential energy function. The initial set of force consts. comes from those of a- and b-D-galactopyranosyl, then the force consts. have been varied, so as to obtain a good agreement between the obsd. and the calcd. vibrational frequencies. The obtained results have finally reproduced the exptl. data and have confirmed the previous assignments made for the methyl-a- and methyl-b-D-galactopyranoside. The calcns. have demonstrated also the transferability of the set of parameters of the initial force field of d-galactose to methyl-D-galactopyranoside. .