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S N Tewari

Publications and source records attributed to S N Tewari.

At least 19 recordsLinked to original sources

The prevalence of Campylobacter pylori gastritis: a study of symptomatic nonulcer dyspepsia and bile gastritis.

We assessed the prevalence of Campylobacter pylori in various forms of endoscopic gastritis, including ulcer and nonulcer dyspepsia and bile gastritis and correlated it with histological evidence of inflammation. Multiple biopsy specimens were taken from 120 patients, including four normal controls, who underwent upper gastrointestinal endoscopy for evaluation of upper abdominal pain and discomfort, nausea, bilious vomiting, weight loss, and anemia. The patients included 58 men and 62 women, with a mean age of 53 years. Of these, 16 patients had gastric ulcers, 19 had duodenal ulcers, 26 had reflux gastritis (after either gastric surgery or cholecystectomy), one had a gastric polyp, one had Barrett's esophagus, and the remaining 53 had gastritis due to unspecified causes. Campylobacter-like organisms were demonstrated by light and electron microscopy in 50 of 69 patients of the nonbile gastritis group (72%) and in seven of 15 patients of the bile gastritis group (47%) (p0.05). The presence of bacteria in both groups correlated with histologically significant inflammation (particularly chronic active gastritis); similar histologic changes were noted in both major groups of nonbile gastritis and bile gastritis. Campylobacter pylori is common in all forms of gastritis in association with histologic inflammation.

Adult↗

Isolation and determination of chlorinated organic pesticides by thin-layer chromatography and the application to toxicological analysis.

A sensitive method for the isolation and clean-up of chlorinated organic pesticides from tissues and biological materials is discussed. RF values of the pesticides in 26 solvent systems, and colours of the spots given with various chromogenic reagents, are reported. The limits of detection, and densitometric measurements, are also discussed. The average recovery has been found to be 94%. The distribution of endrin in different autopsy tissues from five different victims has been studied by the proposed technique.

Autopsy↗

Detection and determination of organophosphorus insecticides in tissues by thin-layer chromatography.

The toxicological analysis of 12 common organophosphorus insecticides is described. Suitable methods for the extraction of organophosphorus insecticides from tissues are proposed. The detection, identification and estimation of these insecticides by thin-layer chromatography is described for 25 solvent systems and a series of chromogenic reagents. The distribution of insecticides in human body tissues in five cases of poisoning by ethyl parathion, malathion, dimethoate, sumithion and phosphamidon has also been studied.

Autopsy↗