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Biomedical subjects

M Nagy

Publications and source records attributed to M Nagy.

At least 127 records · Page 7Linked to original sources
PubMed1979

Cell-mediated and humoral immune responses to cartilage antigenic components.

Cell-mediated immunity and antibody production to cartilage antigens were studied in rabbits. From day 3 of immunization an inhibition of leucocyte migration was observed in animals immunized with collagen-free fractions of bovine nasal or human rib cartilage. Delayed cutaneous hypersensitivity was elicited between 5 and 6 days and the circulating antibodies were demonstrated by passive haemagglutination on day 9. No significant correlation was observed between the antibody production and the cell-mediated immunity. Cell-mediated immune responses to cartilage antigens and to purified protein derivative were distinctly different, but the two antigens influenced one another when they were administered together. The 'species common' antigen of connective tissues may be primarily responsible for the early immune reactions.

Animals↗
PubMed1979

Polythelia associated with disturbances of cardiac conduction.

The authors examined three groups of persons (hospitalized patients, outpatients, and school girls) and conclude that in the cases of polythelia the cardiac conduction disturbances occur considerably more frequently than in persons without polythelia. When polythelia and conduction disturbances occur frequently in a family, the coexistence of both disorders is most probably of hereditary origin.

Abnormalities, Multiple↗
PubMed1977

[Gestonoroncapronate and carbohydrate metabolism during radiotherapie of female patients suffering from cancer of the genitals (author's transl)].

Glucose tolerance test (oral standard glucose tolerance test) was carried out--before starting radiotherapy--in 99 female patients suffering from inoperable cancer of the genitals. 47 of these patients were administered gestonoroncapronate (600 mg/week) during radiotherapy. Glucose tolerance was tested anew after the last irradiation. During the first hour after the second glucose tolerance test, an improvement of glucose tolerance was stated in the patients' group treated with gestonoroncapronate, whereas during the second hour a deterioration of glucose tolerance was found. The patients' collective treated without gestonoroncapronate demonstrated an improved glucose tolerance during the entire second course of the test. A decrease of capacity of the islet cell organ, induced by gestonoroncapronate, is discussed.

Carbohydrate Metabolism↗
PubMed1977

Study of the role of puring phosphoribosyltransferases in the uptake of adenine and guanine by Schizosaccharomyces pombe cells.

1. In the yeast Schizosaccharomyces pombe 972h-, the uptake rate of both adenine and guanine is related to variations in the specific activity of the corresponding phosphoribosyltransferases during the growth of the culture. Furthermore, the mutant strains dap 1, devoid of adenine phosphoribosyltransferase activity, and pur 1, devoid of guanine phosphoribosyltransferase activity have a lowered uptake rate of adenine and guanine respectively, along with an increased apparent Km value for these purines in comparison to the wild-type 972h. 2. The uptake rate of the purines is strongly dependent on the pH of the uptake medium in 972h- as well as in the strains dap 1 and pur 1, the optimum being between pH4 and pH5. 3. A new method of extraction of 5-phosphoribosyl-1-pyrophosphate from the yeast has been devised. Important fluctuations of the P-Rib-P2 pool were measured in S. pombe at different stages of growth, the maximum taking place at the start of the exponential phase, whereas no variations in the specific activity of the P-Rib-P2 synthetase could be observed during the growth. The P-Rib-P2 intracellular content in the mutants devoid of purine phosphoribosyltransferases, namely pur 1, dap 1 and pur 1, dap 1, was increased up to 5-fold as compared to the wild-type strain. 4. The effect of intracellular concentrations of P-Rib-P2, a substrate for phosphoribosyltransferases, on the uptake rate of purines has been studied: addition of formycin to the growth medium lowered simultaneously the P-Rib-P2 intracellular content and the uptake of adenine and guanine. 5. Although our results demonstrate the activating effect of phosphoribosyltransferase activities on the uptake of adenine and guanine, they do not support the hypothesis of a 'group translocation' mechanism.

Adenine↗
PubMed1975

Protoplasts of Schizosaccharomyces pombe: an improved method for their preparation and the study of their guanine uptake.

A new method is described for the efficient conversion of Schizosaccharomyces pombe cells into protoplasts. The following parameters of guanine uptake determined in whole cells were unchanged in protoplasts: Km value, requirement for an energy source, sensitivity to competitive inhibitors, pH optimum, as well as the typical variation of the initial velocity of uptake observed during the growth phase.

Adenine↗