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Biomedical subjects

D Roloff

Publications and source records attributed to D Roloff.

33 records · Page 2Linked to original sources
PubMed1982

[Correlation of erythrocyte sodium concentration and the KG-value in variable peripheral insulin levels].

In pregnant women with physiological hyperinsulinism and in a control group with lower peripheral insulin concentrations after glucose load was investigated, whether differences in the peripheral insulin content involve different relations between the KG-value and the sodium concentration of the erythrocytes. Despite the differences in the peripheral insulin content during the intravenous glucose tolerance test negative correlations between the KG-value and the sodium concentration of the erythrocytes were found in the groups investigated. From this was concluded that these correlations are not based on changes of the peripheral insulin level, as they were established in the present examinations. A conception was presented issuing from the fact that the negative correlation between the KG-value and the sodium concentration is based on properties of the cell membrane which influence the intracellular sodium concentration as well as the effect of insulin in the cell.

Adult↗
PubMed1982

[Carbohydrate tolerance and intracellular sodium concentration in rabbits with dietary hypercholesterolemia].

The transport of sodium ions and glucose is a specialized membrane function. Variations in the cholesterol content of the cell membrane influence these functions. The influence of a hypercholesterolemia upon the intracellular sodium concentration and the glucose tolerance was investigated in cholesterol/rape oil and in cholesterol fed rabbits. The cholesterol/rape oil fed rabbits had lower KG-values and higher peripheral insulin levels than the control animals. The Na+Ery was decreased after 12 weeks of hypercholesterolemia. The na+Muscle was not changed. A negative correlation was found between the KG-value and the Na+Ery (Na+Muscle) in normal rabbits. In the hypercholesterolemic rabbits existed a negative correlation between the KG-value and the Na+Muscle and a positive correlation between the KG-value and the Na+Ery. It was postulated that membrane functions determined these correlations.

Anemia, Hemolytic↗
PubMed1981

[Behavior of intracellular electrolytes in the diabetic metabolic state].

By animal experiments and examinations of test persons with healthy metabolism could be confirmed that a high intracellular content of sodium coincides with a low glucose assimilation coefficient. Moreover, the intracellular sodium concentration seems to have influence also on the peripheral insulin content after glucose load as it was shown by the negative correlation of the quotient Na(Plasma)/Na(Ery) with the insulin concentration surface in the rabbits. In maturity-onset diabetics with and without hypertension compared with a control group the intracellular sodium concentration was increased. This intracellular shift of electrolytes might have an influence of the utilisation of glucose in maturity-onset diabetes.

Animals↗
PubMed1975

[Measurements of blood volume in children with orthostatic syndrome (author's transl)].

The blood volume in 12 children with primary orthostatic syndrome was determined. For six cases it was measured in vertical and horizontal position of the body. Plasma volume was measured by 125J human albumin, erythrocyte volume by 51Cr erythrocytes. In seven cases the values of total blood volume were below the normal values of 68--80 ml/kg body weight when determined in horizontal position. Diminished values were found especially in children suffering from severe orthostatic syndrome. The results indicate the diminution of total blood volume to be an important pathogenetic factor in orthostatic syndrome. In primary orthostatic syndrome it should be differentiated between a hypovolemic type, and a type of predominantly vascular dysregulation. It is suggested that the development of blood volume regulation is delayed. The reduced capacity of the vascular system associated with reduced physical activity could be an additional factor. The active total blood volume increased in all six cases with the change from an upright to a recumbent position. The mean of the difference (3.8 ml/kg body weight) was found to be lower than that in adults. This suggests that sequestration of blood volume is of no evident significance in childhood.

Blood Volume Determination↗
PubMed1975

[The function of innervated kidneys during stimulation of the carotid chemoreceptors under constant renal perfusion pressure].

The carotid chemoreceptors of narcotized, vagotomized and spontaneously breathing hydropenic cats in hypertonic mannite diuresis were stimulated by perfusion with venous blood penic cats in hypertonic mannite diuresis were stimulated by perfusion with venous blood for 70 min. Elevation of blood pressure at the innervated kidneys was prevented by an automatically controlled balloon located within the aorta. Stimulation of the chemoreceptors intensified respiration and raised the arterial systemic pressure. With the renal arteries at constant pressure, the effective renal plasma flow and the glomerular filtration rate significantly declined. The filtration fraction remained unchanged. The absolute urinary and sodium excretion did not change significantly, whereas the fractional time-volume, fractional sodium excretion, and the fractional osmotic excretion significantly increased. The fractional tubular reabsorption of osmotically free water was significantly enhanced. These reactions subsided during subsequent perfusion of the glomerula carotici with arterial blood. The results suggest that tubular sodium reabsorption is inhibited by stimulation of the carotid chemoreceptors, although re-adjustment of renal perfusion and filtrate volume cannot be excluded.

Absorption↗