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Biomedical subjects

R S Varma

Publications and source records attributed to R S Varma.

At least 37 records · Page 2Linked to original sources

Serum glycoconjugates in children with schizophrenia and conduct and adjustment disorders.

The serum glycoproteins represented by the individual protein-bound carbohydrate components and glycosaminoglycans represented by the hexuronic acid contents were determined in the sera of black and Caucasian normal children and children with diagnoses of schizophrenia, conduct disorder, and adjustment disorder. There were no race-related or sex-related differences in glycoproteins and glycosaminoglycans in the sera of normal children. Although the serum glycosaminogltents were determined in the sera of black and Caucasian normal children and children with diagnoses of schizophrenia, conduct disorder, and adjustment disorder. There were no race-related or sex-related differences in glycoproteins and glycosaminoglycans in the sera of normal children. Although the serum glycosaminogltents were determined in the sera of black and Caucasian normal children and children with diagnoses of schizophrenia, conduct disorder, and adjustment disorder. There were no race-related or sex-related differences in glycoproteins and glycosaminoglycans in the sera of normal children. Although the serum glycosaminoglycans were significantly elevated in children with a diagnosis of schizophrenia, the levels were in normal range in children with conduct and adjustment disorders. All of the protein-bound carbohydrates were elevated in schizophrenic children. However, only arabinose and galactosamine were significantly elevated in children with a diagnosis of conduct disorder, while only galactosamine was elevated in children with adjustment disorder. The presence of arabinose in serum glycoprotein was confirmed by chemical ionization-mass spectrometry. The possible causes of the differential elevation of the glycoconjugates in psychiatric disorders in relation to the effect of stress and environment are discussed.

Adjustment Disorders↗

The protein-bound carbohydrates of seromucoid from normal human serum.

The neutral sugars and hexosamines in the seromucoid fraction of normal human serum were identified and determined simultaneously by gas-liquid chromatography of their aldononitrile acetates. Besides the sialic acid, normal seromucoid contained fucose, arabinose, mannose, glucose, galactose, glucosamine and galactosamine. The presence of arabinose and glucose, not previously reported in seromucoid, as well as the other known carbohydrate components determined by GLC were confirmed from their fragmentation patterns in the electron impact mass spectra and chemical ionization spectra.

Adult↗

Synthesis of 4-(3-benzazolymethyl)aminodiphenyl ethers and other related products as potential antimicrobial agents.

4-Aminodiphenyl ethers (2) obtained by reducing the corresponding nitro analogue (1), have been incorporated into benzazoles, phthalimides and 4-quinazolone in the presence of 40% formalin to furnish a series of 4-(3-benzazolymethyl)aminodiphenyl ethers (3) under the conditions of the Mannich reaction. In an alternate procedure, 3 were obtained on refluxing the N-hydroxymethyl derivatives of benzazoles etc. with 2 in methanol. A few amine exchange reactions were also performed and the stability of a few representative compounds was studied in different acidic media. The antibacterial spectrum of all the synthesized compounds was determined against Bacillus subtilis as well as Bacillus pumilus by the agar diffusion technique.

Anti-Bacterial Agents↗

Recent progress in oligonucleotide synthesis.

It was found that some improvements in oligoribo- and oligo-2'-deoxyribonucleotide synthesis via the phosphotriester approach could be achieved using the p-nitrophenylethyl group for phosphate protection due to its stability in the condensation step and its clean removal of DBU and DBN respectively. Recent results will prove the synthetic advantages over known procedures.

Bridged Bicyclo Compounds↗

Glycosaminoglycan levels in sera of patients with mental disorders.

A nonspecific increase in serum glycosaminoglycans was observed in mental conditions associated with psychosis, brain trauma and mania but not in depression. Significant elevations also occurred in alcoholics and epileptics. The role of glycosaminoglycans in relation to the blood-brain barrier and mental illness has been discussed.

Adult↗

Serum and mucopolysaccharide (glycosaminoglycans) levels in psychiatric patients.

Serum acid glycosaminoglycans (GAG) levels were measured in 50 normals and 177 samples from different types of psychiatric patients. Mean levels were significantly higher in paranoid type schizophrenia, organic brain syndrome associated psychosis and manic type manic-depressive psychosis. The levels returned to slightly above the normal range upon partial remission in paranoid schizophrenics. In catatonic and hebephrenic schizophrenias the values were in the upper part of normal range. The levels were either in upper normal range or slightly higher in non-psychotic organic brain syndrome. In depressed type manic depressive psychosis levels were either lower than normal or in the lower part of normal range.

Adolescent↗

A simple procedure for combined gas chromatographic analysis of neutral sugars, hexosamines and alditols. Determination of degree of polymerization of oligo- and polysaccharides and chain weights of glycosaminoglycans.

A reliable and reproducible method that allows the combined, simultaneous gas chromatographic (GC) determination of neutral sugars, hexosamines, alditols, identification and quantitation of the reducing aldose end-group in oligo and polysaccharides and glycosaminoglycans has been described. It involves the following steps: release of the reducing end-group from its protein linkage in glycosaminoglycans and reduction of this reducing end-group into alditol, release of the components of the reduced polymer by resin-catalysed hydrolysis, nitrous acid deamination of the resin-bound hexosamines in this hydrolysate into anhydroaldoses and a combined derivatization and GC determination of the neutral sugars as aldononitrile acetates, anhydroaldoses as peracetylated oximes and alditols as alditol acetates. Application of the method to determination of degree of polymerization of oligo-and polysaccharides and chain weights of proteoglycans has been described. This method has several advantages over the previous methods.

Animals↗

On arabinose as a component of brain hyaluronate. Confirmation by chromatographic, enzymatic and chemical ionization-mass spectrometric analyses.

The controversy about the presence of the pentose arabinose in brain hyaluronate was reinvestigated using modern analytical tehcnics. The purified bovine brain hyaluronate contained the neutral sugars: arabinose, 0.18%; glucose, 0.05%; and fucose, 0.22%. The confirmation of the presence of arabinose was obtained by paper and thin layer chromatography of the neutral sugars in deionized hyaluronate hydrolysate. Gas-liquid chromatography of the aldononitrile peracetate of the pentose isolated by preparative paper chromatography gave a single distinct peak, corresponding to standard arabinose on three columns packed with three different phases. Chemical ionization data and mass spectrum of the aldononitrile peracetate derivative agreed with those of the authentic arabinonitrile tetracetate. Analysis of the isolated pentose with the help of the enzymes L-arabinose isomerase and L-ribulose kinase, which are specific for their substrates, further established its identity as L-arabinose.

Animals↗

Simultaneous determination of neutral sugars and hexosamines in glycoproteins and acid mucopolysaccharides (glycosaminoglycans) by gas-liquid chromatography.

A reliable and reproducible method for the simultaneous determination of neutral sugars and hexosamines in glycoproteins and acid mucopolysaccharides has been described. It involves the following steps: the release of neutral sugars and hexosamines from biopolymers by resin-catalysed hydrolysis, the nitrous acid deamination of resin-bound hexosamines in this hydrolysate to aldoses, and the determination of these newly formed anhydroaldoses together with the pre-existing neutral sugars as aldononitrile acetates by gas chromatography. Applications of this method to analyses of glycoprotein from urine of schizophrenic patients, bovine thyroglobulin, human brain glycoprotein, chondroitin sulfates from bovine vitreous humor, and veal brain, and human umbilical cord hyaluronic acid are given.

Animals↗