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Biomedical subjects

E Villarreal

Publications and source records attributed to E Villarreal.

5 recordsLinked to original sources
PubMed1975

A multigroup model for predator-prey interactions.

The predator-prey interactions between the protozoan Tetrahymena pyriformis and the bacterium Aerobacter aerogenes have been studied experimentally and mathematically. A mathematical model for the ciliates defines the mass distribution of cells within the population. The resulting model equations are solved by the use of multigroup theory. Experimental data from batch and continuous flow rectors are compared with the results of the numerical integration.

Carbon↗
PubMed1975

Serum free proline and free hydroxyproline in patients with chronic liver disease.

Serum free proline and free hydroxyproline were determined in 71 patients with liver disease and in 62 control subjects. The group with liver disease included 60 patients with liver cirrhosis and 11 with chronic active liver disease. Forty-five of the cirrhotic patients were alcoholics, 9 of which were studied during an episode of alcoholic hepatitis. The control group consisted of 24 healthy volunteers, 19 primary malnourished patients, and 19 severely ill patients without liver disease. The values obtained in normal subjects were quite constant; no differences related to sex or age were detected. In patients with malnutrition, and especially in severely ill patients, the proline values were always below the normal limit. Patients with nonalcoholic cirrhosis or chronic active liver disease had serum proline and hydroxyproline values similar to those of normal subjects. However, the patients with alcoholic liver cirrhosis had proline and hydroxyproline values significantly higher than the normal group. Furthermore, in patients with alcoholic hepatitis the serum free proline values were significantly higher than in the other groups. The results suggest that alcohol might have a direct effect on proline metabolism or facilitate its release from the liver cell.

Adolescent↗