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Biomedical subjects

D Quemada

Publications and source records attributed to D Quemada.

12 recordsLinked to original sources
PubMed1979

[A fast transient osmotic method. Simultaneous in vivo determination of the reflexion coefficient and of the permeability/filtration coefficient ratio of the pulmonary capillary endothelium in the dog].

Thermodynamic variables characterizing the transport of water and urea across Dog pulmonary capillary membrane were obtained in vivo by means of a pulse transient osmotic method. Results were inconsistent with the hypothesis of a homoporous membrane. When data were interpreted in terms of an exclusive water channel and of a shared pore pathway, the value of the pore reflexion coefficient was close to zero for urea.

Animals↗
PubMed1979

[A fast osmotic transition method for the study of pulmonary transcapillary exchange: theoretical model].

A theoretical model allowed the simultaneous determination of the reflexion coefficients of capillary membrane to small hydrophilic molecules and of the ratios of their permeability to filtration coefficient. This was applied to dilution curves obtained after injection of a hypertonic solution containing a vascular tracer. The calculated variables did not depend on the capillary exchange surface area.

Capillaries↗
PubMed1976

[An index of erythrocyte rigidity deduced from viscosimetry].

An erythrocyte rigidity index chi defined from viscosimetry, shows significant deviations from normal values in abnormal (hardened red cells, stored blood, sickle cells,...). Moreover, chi-variations vs. plasma viscosity are found in good agreement with the Taylor relation for emulsions and lead to a red cell internal viscosity ni approximately 1-2 cP.

Blood Viscosity↗
PubMed1976

[A new method of characterization of blood viscosity].

With a viscosity hematocrite-shear rate relation etare1 = eta (c, psi), which fits several data, one can define, for blood characterization a set of parameters, directly related to red cell deformation and aggregation.

Blood Viscosity↗