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Biomedical subjects

G Varela

Publications and source records attributed to G Varela.

At least 109 records · Page 6Linked to original sources
PubMed1978

[Influence of small bowel resections on some aspects of digestive secretions in rat (author's transl)].

Some aspects of the digestive secretions both in intact rats (control group) and in rats with resection of 50% and 80% of the small intestine starting from ileocecal valve have been studied. In every animal, the volume of duodenal content, total content of bile salts and amylasic activity have been analysed under the following experimental conditions: fasting, feeding with two diets containing 4% and 20% of fat, and intravenous injections of pancreozymin (2 UI/kg). Total content of bile salts and amylasic activity decrease in resected rats under fasting and feeding. This decrease is greater when larger portions of the intestine are removed. Rats injected with pancreozymin react in a similar way. The amylasic activity decrease in the resected rats indicates a pancreatic hypofunction caused by the resection and cannot be compensated by administration of pancreozymin. Measurements of seric cholesterol show that a 50% resection causes a decrease form normal levels and a 80% resection makes it significant.

Amylases↗
PubMed1977

[The effect of Ca/P relation on utilization of both nutrients in laying quails (author's transl)].

The effect of two Ca/P relations (2.1 y 4.5) in the diet on nutritive utilization of both minerals, egg production and egg characteristics (weight, size, resistence and shell Ca content) was studied. Nutritive utilization and absolute body retention of Ca were higher with a Ca/P relation of 4.5, while the lower Ca/P relation (2.1) produced a greater utilization of P, without differences as high as in the case of Ca. As a whole, the diet with a Ca/p relation = 2.1 was more efficiently utilized but egg production did not rise optimal levels got on the diet with a Ca/P relation = 4.5 Egg characteristics were similar with both treatments.

Animals↗
PubMed1977

[Some aspects of vagal control of exocrine pancreatic secretion in rabbits (author's transl)].

Stimulation of the thoracic vagus nerves in anesthetized rabbit appears to act only by increasing the amylase content of pancreatic juice. Stimulation of the abdominal vagus nerve slightly increased the flow of juice and clearly its amylase content, effects which were respectively reduced and abolished by atropine. The vagal control of the exocrine pancreas in rabbits shows substantial differences when compared with other herbivorous monogastric species such as horse and pig.

Amylases↗
PubMed1976

[Diet effect on fatty acids composition in trout (salmo gairdnerii). rev. esp. fisiol., (author's transl)].

The effect of diets with different fatty acids composition on muscular and hepatic fatty acids of rainbow trout (Salmo gairdnerii) was studied. The effect was higher on muscular fatty acids than on hepatic ones. The lack of correlation between dietary and liver fatty acids in diets with a high level of linoleic acid, showed a better utilization of this acid by the liver. The change in muscular fatty acids pattern was observed within a week of diet change, showing a significant tendency to approach the new dietary fatty acids pattern.

Animals↗
PubMed1976

[Calcium metabolism in lactating goats: influence of sodium oxalate, sodium citrate and EDTA].

The influence of 2 p. 100 sodium oxalate, 4,57 p. 100 sodium citrate and 0,4 p. 100 Na2EDTA on various aspects of calcium metabolism and on milk characteristics has been studied in lactating goats. Sodium oxalate leads to no modifications of the variables studied : digestibility coefficient, biological valu+, coefficient of nutritive utilization and the coefficient of body retention. The only appreciable effect of sodium oxalate was on the amount of absorbed and utilized calcium which is diverted towards milk. These two values are decreased in the presence of oxalate. When sodium oxalate and sodium citrate were simultaneously added to the diet, citrate was shown to have no effect on digestibility, biological value, the coefficient of nutritive utilization and the coefficient of body retention, but did, however, considerably increase the amount of utilized calciun which was diverted towards milk. Concerning Na2EDTA, despite its higher calcium mobilizing power, it had no effect on the digestibility coefficient, the biological value, the coefficient of nutritive utilization and the coefficient of body retention; neither did it have an effect on the level of incorporation of calcium into milk. Calcium digestibility was cleorly higher in the latter two groups, where calcium ingestion was lower and milk production higher, conditions which both favorize calcium absorption.

Animals↗
PubMed1976

[Free endogenous aminoacids in perfused intestine in rats (author's transl)].

The intestinal content of free aminoacids from endogenous origin is studied by perfusion through the small intestine of rats under the influence of several factors, pancreatic and biliary secretions, the addition of L-glutamic acid at two different concentrations to the perfusion liquid either with the pancreatic and biliary secretion or without them. The conclusion is reached that the pancreatic juice contributes significantly to the intestinal amount of free aminoacids; the addition of L-glutamic acid to the perfusion liquid under the fixed experimental conditions decreases the amount of free amino acids transfered by active mechanisms in the intestinal contents. This effect shows a certain selective preference to the essential aminoacids against the non-essential aminoacids. Such effect is not observed, however when the pancreatic secretion is not present in the intestinal contents.

Amino Acids↗