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S A Borisova

Publications and source records attributed to S A Borisova.

14 recordsLinked to original sources
PubMed2000

Structure of an acidic O-specific polysaccharide of the bacterium Providencia alcalifaciens O7.

An acidic O-specific polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of the bacterium Providencia alcalifaciens O7 and purified by gel chromatography followed by anion-exchange chromatography. On the basis of full acid hydrolysis, methylation, carboxyl reduction, selective cleavage with anhydrous hydrogen fluoride, and 1H- and 13C-NMR spectroscopy, including two-dimensional 1H,1H homonuclear and H-detected 1H,13C heteronuclear correlation spectroscopy and nuclear Overhauser effect spectroscopy (NOESY), the following structure of the linear tetrasaccharide repeating unit of the polysaccharide was established: [figure], where Rhap2Ac is 2-O-acetylrhamnopyranose.

Carbohydrate Conformation↗
PubMed1999

Biosynthesis of desosamine: construction of a new macrolide carrying a genetically designed sugar moiety.

[formula: see text] The appended sugars in macrolide antibiotics are indispensable to the biological activities of these important drugs. In an effort to generate a set of novel macrolide derivatives, we have created a new analogue of methymycin and neomethymycin, antibiotics produced by Streptomyces venezuelae. This analogue 15 carrying a different sugar, D-quinovose, instead of D-desosamine, was constructed by taking advantage of targeted gene deletion combined with a specific pathway-independent C-3 reduction capability of the wild type S. venezuelae.

Amino Sugars↗
PubMed1998

Structure of the O-specific polysaccharide of Citrobacter freundii O3a,3b,1c.

The following structure of the O-specific polysaccharide of Citrobacter freundii O3a,3b,1c containing D-mannose and D-rhamnose was established using sugar analysis and NMR spectroscopy, including computer-assisted analysis of the 13C NMR spectrum, 2D COSY, H,H-relayed COSY, heteronuclear 13C, 1H correlation (HETCOR), and rotating-frame NOE spectroscopy (ROESY):-->4)-alpha-D-Manp-(1-->3)-beta-D-Rhap-(1-->4) -beta-D-Rhap-(1-->.

Carbohydrate Sequence↗
PubMed1998

Identification of N epsilon-[(R)-1-carboxyethyl]-L-lysine in, and the complete structure of, the repeating unit of the O-specific polysaccharide of Providencia alcalifaciens O23.

N epsilon-[(R)-1-Carboxyethyl]-L-lysine was released by acid hydrolysis from the O-specific polysaccharide of Providencia alcalifaciens O23 and identified by 1H and 13C NMR spectroscopy, GLC-MS after conversion to a di-N-acetylated dimethyl ester, and by comparison with the authentic sample. Solvolysis of the polysaccharide with anhydrous HF resulted in an amide of D-glucuronic acid with N epsilon-[(R)-1-carboxyethyl]-L-lysine. These and published data allowed the determination of the full structure of the repeating unit of the O-specific polysaccharide.

Carbohydrate Conformation↗
PubMedDate not supplied

[Effect of pantogam on visual function and hemodynamic of eyes in patients with primary open-angle glaucoma].

The complex therapy in patients with primary open-angle glaucoma, with normalized intraocular pressure but with declined visual functions included the use of the Russian neurometabolic preparation pantogam. The improvement of the visual function appeared as enlargement of the borders of visual fields, decreased area and sensitivity deficit (according to computer perimetric data). Doppler ultrasonography has demonstrated an increase in the mean blood velocity in the orbital vessels and a decrease in eyeball blood supply defects after pantogam therapy which is a favourable sign of a glaucomatous process. The authors consider the use of pantogam to be rational in the complex therapy of patients with glaucoma.

Adult↗
PubMedDate not supplied

[Effects of nootropic agents on visual functions and lacrimal antioxidative activity in patients with primary open-angle glaucoma].

The paper presents the results of an investigation of the effect of the nootropic agents pantogam and nooclerine on visual functions in patients with primary open-angle glaucoma. These agents have been found to have a beneficial effect on the functional activity of the retina and optic nerve, light sensitivity, hemo- and hydrodynamics of the eye.

Aged↗