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Biomedical subjects

H Bauer

Publications and source records attributed to H Bauer.

At least 271 records · Page 15Linked to original sources
PubMed1980

[Selective proximal vagotomy and pyloroplasty--long range experiments in the rat (author's transl)].

Following the evaluation of the result of SPV in rats by determination of reduction of acid production the effect of the same operation on gastric motility was compared to that obtained with both SPV and a simultaneous pyloroplasty in a one year study. As demonstrated radiologically, with SPV alone gastric stasis resulted in a greatly enlarged stomach with a high percentage of peptic ulcers. Animals who had SPV together with pyloroplasty showed good emptying of the stomach with few ulcers. In this group the incidence of ulceration was reduced from 45% to 5,5%.

Animals↗
PubMed1980

[Acid reduction after SPV and after H2 receptor blocking substance cimetidine. Comparative studies in Shay-rats)].

The effect of a complete selective proximal vagotomy on stomach acidity has been compared experimentally to that of the H2 receptor blocking agent cimetidine in the rat. Both methods produced a significant reduction of total acid as compared to controls, a reduction to 0.5 % for cimetidine and to 0.1 % for SPV. The acid reduction following SPV is a result of decreased production of stomach fluid as well as a decrease in degree of acidity. The acid reduction following administration of cimetidine is mainly a result of an increase in pH without any change in volume of stomach fluid production.

Animals↗
PubMed1979

[Cimetidine in the preoperative treatment of acute bleeding gastroduodenal lesions (author's transl)].

Whereas prospective studies seem to substantiate the efficacy of cimetidine treatment in the prophylaxis of acute gastrointestinal hemorrhage, communications on the therapeutic effect of cimetidine at the bleeding stage are contradictory. Our own experience is based on the treatment of 36 patients with acute hemorrhage of the upper gastrointestinal tract. Cimetidine was applied as a continuous drip, the objective being early operation when bleeding stopped, especially in peptic lesions. A primary cessation of bleeding was attained in all patients during the first 4 hours.

Acute Disease↗
PubMed1979

Early molecular events in the interaction of enveloped viruses with cells. I. A fluorescence and radioactivity study.

The fluorescence depolarization of 1,6-diphenyl-hexatriene was used to study the dynamic properties of the hydrophobic regions of the lipid envelopes of ortho- and paramyxoviruses as well as of the Rous sarcoma virus and of the membrane lipids of susceptible and nonsusceptible cells. The systems investigated where active and inactive influenza viruses, and NDV virus acting on chick embryo fibroblasts and Rous sarcoma virus acting on susceptible (C/E) and nonsusceptible (C/B) chicken-cell. Polarization degrees and mean rotational correlation times of DPH embedded in viral lipids were significantly higher than those of DPH in the cell membranes, due to a higher rigidity of the virus envelopes. When suspensions of labelled viruses and unlabelled cells or unlabelled viruses and labelled cells were mixed, a characteristic change of the fluorescence polarization degrees with time was observed. This behaviour was ascribed to label transfer from virus to cell membranes or vice versa. While the rate constants of label transfer from virus to cells and cells to virus were about the same for the penetrating viruses the rate constants of label release from inactive virus to cells were much larger than for the migration in the opposite direction.

Animals↗
PubMed1979

Semliki forest virus: cause of a fatal case of human encephalitis.

A fatal case of human encephalitis has been observed for which our results indicate that Semliki Forest virus (SFV) was the etiologic agent. This is surprising in view of the fact that this virus, which has been widely studied, was believed to be one of the arboviruses nonpathogenic for man. Described are the clinical course, the virological examinations performed, and the histopathological findings in the central nervous system.

Adult↗
PubMed1979

Crayfish carboxypeptidase. Affinity chromatography, characterization and amino-terminal sequence.

In an effort to trace the evolutionary history of the pancreatic metalloexopeptidases, carboxypeptidase has been isolated from the cardia of the crayfish Astacus fluviatilis. The isolation procedure included affinity chromatography on a column of potato carboxypeptidase inhibitor covalently linked to Sepharose. Approximately 25 mg of pure enzyme can be obtained by the present procedure from 50 ml of cardia fluid. The pure enzyme resembles bovine carboxypeptidase B in specificity and is inhibited both by 3-phenyllactate and by 6-aminohexanoate. The pH optimum of activity is about pH 6.5, and the isoelectric point,pH 4.0. Inhibition by typical metal chelating agents (i.e. ethylenediamine tetraacetate and 1,10-phenanthroline) and neutron activation analysis indicate that, like the mammalian enzyme, crayfish carboxypepetidase is a zinc metalloenzyme. The purified enzyme migrates as a single band in cellulose acetate, disc gel and sodium dodecylsulfate gel electrophoresis. The amino acid composition is similar to that of pancreatic carboxypeptidases except for a higher content of acidic amino acid residues. The amino acid sequence of the first 19 amino-terminal residues reveals significant homology to that of pancreatic carboxypeptidases A and B.

Amino Acid Sequence↗
PubMed1979

Operant conditioning of brain steady potential shifts in man.

Steady potential shifts (SPS) recorded from the scalp were conditioned operantly by visual and acoustical feedback. Three groups of seven subjects were each tested with a different response-reinforcement contingency: positive reinforcement for a positive SPS after a cue stimulus, positive reinforcement for a negative SPS after a cue stimulus, and noncontingent reinforcement. The steady potential shifts learned under these three conditions differed significantly. Negative shifts were associated with subjective feelings of activation, positive shifts with inactivation. Cortical genesis and possible artifacts are discussed.

Action Potentials↗
PubMed1979

Src Gene product from different strains of avian sarcoma virus: Kinetics and possible mechanism of heat inactivation of protein kinase activity from cells infected by transformation-defective, temperature-sensitive mutant and wild-type virus.

Sera from certain rabbits bearing Schmidt-Ruppin strain Rous sarcoma virus (RSV)-induced tumors precipitated p60(src) from chicken cells transformed by the homologous virus as well as by other strains [Prague strain RSV, Bryan high-titer strain RSV, and Bratislava 77 strain of avain sarcoma virus (ASV)], the molecular weights (M(r)s) ranging from 60,000 to 64,000. The p60(src) immunoprecipitated from cells transformed by each of these strains incorporated [gamma-(32)P]ATP into the M(r) 53,000 subunit of IgG, though with differing activities. No such protein kinase activity (ATP:protein phosphotransferase, EC 2.7.1.37) was observed when the following immunoprecipitates were used: from uninfected cells, from untransformed cells infected by Rous-associated virus, or from cells transformed by acute leukosis viruses, avian erythroblastosis virus, or myelocytoma virus 29. The kinase reaction had a pH optimum at pH 5.9 and an apparent K(m) for ATP of 4.9 +/- 2 muM, and was dependent on Mg(2+) (K(b) = 46 +/- 12 mM), for which Ca(2+) was no substitute. The kinase was cyclic AMP independent. In order to test whether the protein kinase reaction is directly catalyzed by p60(src), we compared the in vitro temperature sensitivities of the kinase activities from cells infected by transformation-temperature-sensitive mutant and parental wild-type virus. The first-order rate constant for the inactivation of the kinase from extracts of cells infected by the mutant virus was 2-fold greater than that from cells infected by wild-type virus. This result implicates the protein kinase as an enzymatic activity of the src gene product, the p60(src). Concomitant with the loss of the kinase activity by heat inactivation, p60(src) loses 60-70% of its phosphate content. The kinetics of dephosphorylation exactly parallel those for the inactivation of the kinase activity, suggesting that the p60(src) kinase is itself dependent on phosphorylation for its activity.

Animals↗
PubMed1979

Pemphigus vulgaris and lymphoma in a patient with scleroderma.

The coexistence of scleroderma and malignancy is well documented. The case presented here is unique, however, as it is the first report of the occurrence of diffuse histiocytic lymphoma and pemphigus vulgaris in a patient with scleroderma. Because of this unusual triad of diseases, the possibility of a common pathogenetic basis was examined. A review of the literature confirms that each disorder does have immunologic abnormalities. It is suggested that an aberrant immune response, specifically impaired T-cell function, is responsible for the emergence of disease of this patient.

Female↗