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Biomedical subjects

E Schulz

Publications and source records attributed to E Schulz.

At least 253 records · Page 14Linked to original sources
PubMed1977

[Effect of sensory stimulation on the lamina V pyramidal neurons of the gyrus cinguli in the rat].

UNLABELLED: Three groups of Wistar-rats were exposed to permanent noise (80 db) during different periods in their postnatal life: the first group was exposed starting from birth for a period of four weeks, the second one from birth up to nine weeks of age and the third group from the fifth up to the ninth week postnatal. A fourth group (control animals) was reared under normal laboratory conditions. After the experiments the brains were exposed to a modified GOLGI-method. In lamina-V-pyramids of the gyrus cinguli lightmicroscopical results: length, number and distribution of spines on the main apical dendrites and on the apical dendritic branches where evaluated. MAIN RESULTS: 1. Permanent noise during the early postnatal development phase of the brain of rats (from birth up to the fourth week of age) causes a statistically significant increase of apical spines. The spines-values are 20% above those of the control animals. 2. Permanent noise from birth up to the ninth week of age or applied only during the later postnatal period (from the fifth week up to the ninth week of age) does not significantly alterate the spines-value. 3. The results are estimated as a consequence of extreme environmental factors causing effects, comparable with an universal stress reaction. Conclusions were discussed in comparison to the results of other authors.

Acoustic Stimulation↗
PubMed1977

[Quantitative study of the apical dendritic spines in the cingulate lamina-V-pyramid neurons of the rat following oral application of alcohol].

The question answered in this paper is whether the apical dendritic spines-values of lamina-V-pyramidal cells of the gyrus cinguli of the rat are changed as a result of the oral application of ethanol. Alcohol-application causes a statistically significant increase of apical spines, especially at the main dendrite when given during the early postnatal development phase, where the brain is still impressible. The results are discussed as compensatory achievement of the not degeneratively changed neurons, while other pyramids show signs of degeneration. The conclusions were compared with the results of Kunz et al. (1976), who investigated the ethanol-effects on hippocampal pyramids.

Animals↗
PubMed1976

[Rise in serum creatinine under the androgen fluoxymesterone in chronic renal disease (author's transl)].

Eight men with chronic renal disease in the stage of compensated retention were given high doses of the androgen fluoxymesterone (40 mg/m2/day) for erythropoietin stimulation for 4 weeks. Seven of them showed a transient significant average rise in the serum creatinine level of 3.8 to 6.1 mg% which partly regressed only 8 to 12 weeks after stopping the medication. The rise in serum creatinine which appears under fluoxymesterone is attributable to a transient increase in the renal excretory function disturbance and/or a raised catabolism. Warning should be given against the further use of this drug in the treatment of renal anemia.

Adult↗
PubMed1976

[Side effects of aminoglycosides: nephrotoxicity (author's transl)].

Animal experiments showed that all aminoglycosides cause similar toxic tubular and glomerular damage when investigated by qualitative morphology. Quantitative differences in the tubular nephrotoxicity of gentamicin, tobramycin, sisomicin, kanamycin, kanendomycin, amikacin, and butirosin can be demonstrated experimentally by evaluation of the excretion rates of tubular cells and urinary enzymes in rats. By this means dose-effect relationships were established resulting in varying reproduceable toxic threshold doses for each antibiotic, and thus in a scale of increasing nephrotoxicity. The aminoglycosides differed in their affinity to kidney tissue as measured by determination of the accumulating renal concentrations of the drugs at different times during multiple-dose administration. This had a modifying influence on excretion rates of cells and enzymes affecting the scale of toxicity in long-term studies. Comparative investigations on nephrotoxicity in rats and guinea pigs gave similar results. In addition, a study in man suggested that the test results of nephrotoxicity are not species-specific. For human therapy it is concluded that even more caution should be practised with the new aminoglycerides than with gentamicin in order to avoid renal damage.

Amikacin↗
PubMed1976

Pressure-jump relaxation studies of the association--dissociation reaction of E. coli ribosomes.

The association--dissociation kinetics of ribosomal particles from E. coli have been studied using a pressure-jump apparatus with optical detection. Experiments on isolated subunits yield two relaxation times of about 10 and 700 ms, respectively. With mixtures of 30 S and 50 S particles an additional relaxation time of about 100 ms is observed, which is assigned to the equilibrium 30 S + 50 S in equilibrium 70 S. The two other times are attributed to reversible equilibria between subunit monomers and subunit homo-associates.

Binding Sites↗
PubMed1976

[Quantitative studies on the dendritic spine distribution on the lamina-5 pyramidal cells in the anterior gyrus cinguli of the rat].

At three months old male rats the spine-distribution of the main dendrite and of the apical and basal dendrites of 36 lamina V-pyramidal cells of the regio cingularis (anterior cingulate cortex) was analyzed (from every subregion -- neocortex, mesoneocortex, mesoarchicortex -- 12 neurons). 1. The limbic pyramidal neurons show the same spine-distribution at their main dendrite as neocortical neurons of other brain regions and other mammal-species do: after an initial segment with poor spines only there follows an rapid increase of the spine-values with an amount at a range of 150 mum from the perikaryon, thereafter spine-values decrease continuously and slowly up the branching into the terminal bundle. 2. Basal and apical lateral dendrites however show another spine-distribution: basally there is an increase of the spine-values from the 1st up to the 3rd order, followed by a decrease at subsequent orders. Apically spine-density decreases from the 1st up to the 4th order. 3. The spine-distribution at the parts of the dendritic tree is discussed as a general biological sign of pyramidal cells. 4. The total number of spines of lamina V-pyramidal cells in the regio cingularis (anterior cingulate cortex) is less than those in the sensomotoric cortex and in the hippocampus, which corresponds with the lower differentiation of the limbic cortex. 5. By means of a variance-analysis the pyramidal spine-values of the three subregions were compared: concerning the total number of spines of a pyramidal neuron there are significant differences between the three subregions; the values are in the ratio of 3 to 2 to 1 (Regio praecentralis agranularis, 2461; mesoneocortex, 1664; mesoarchicortex, 800). The significantly least spine-density of all parts of the dendritic tree you can find in lamina V-pyramidal cells of the mesoarchicortex. 6. The equality of the basal and apical spine-values in the mesoneocortex is due to less specialization of these neurons. 7. The spine-values for a single dendritic field (EDF) show the differences between the limbic subregions clearly: there are significant differences between the three subregions concerning not only the number of spines but also the spine-densities apically and basally.

Animals↗
PubMed1976

[Comparative experiments on erythropoietin concentrations in ultrafiltered urine (Diaflo-process) and urine dialysis with higher osmolar substances (Carbowax( (author's transl)].

The Diaflo-ultrafiltration process with polyion membranes, UM 10, PM 10, and PM 30 for the determination of erythropoietin concentration in urine is compared with the method of urine dialysis in Visking tubes against Carbowax. The aberage regain of animal erythropoietin in human urine by ultrafiltration with the UM 10-membrane is 84%, with the PM 10-membrane 62%,with the PM 30-membrane 17% and with urine dialysis 71%. Mice show a lower toleration for the UM 10 concentrates than for the concentrates prepared by urine dialysis. The concentrates of kidney patients also cause a higher mortality in the animals. The concentrates are tolerated when equal amounts of urine components are incorporated in a three times larger volume and this is divided into three separate injections. Mice with polyglobulia tolerate urine concentrates when not more than 6% of a whole contrate of a 24-hours-urine per mouse is injected in the peritoneum. There is a low iron incorporation rate in the mice that show a strongly toxic reaction.

Animals↗