Enhancement of sodium in relation to absorption in malnourished rats: hyperosmolar challenge

Two experimental models were tried in young molnourished rats in order to study effect of an hyperosmolar challenge in the small intestine on the bi-diretcional fluxes of sodium. Wealning rats were with emergy restricted diets. In model I 1mL of NaCl900 mOsm/kg was introduced in the smal intestine of the rats left from 5 up to 70 min, in order to determine the moment of higher net Na secretion, which occurred at 10 min. In model II, the bi-directional fluxes of Na and Cl- were studied using Na Cl or mannitol 900 mOsm/kg under the effect of mecholil, atropine or 2-4 dinitrophenol, for 10 min. Mecholil decreased the Na absorption enhancing the net secretion. Control rats were used as reference. In the restricted diets animals occurred an increase of the net secretion stimulated by NaCl 900 mOsm/kg, and this effect was enhanced by mecholil. It is suggested that in malnutrition there is an impairment in Na- intestinal absorption.

Effects of dietary fat and nitrite on plasma and corporal density / Efeitos da gordura e nitrito da dieta na densidades

Two groups of nine weanling male rats each were def different diets for 60 days. Group A (control) was fed a full casein diet containing 17 por ciento protein. The group B received the same diet plus nitrite, fried bacon and proline. Diet B induced increased body weight gain and increased plasma 1-lactic acid and cholesterol levels, as well as a decrease in plasma selenium. We suggest that the adverses effects of diet B are related to peroxidation, with an increased nutritional need for selenium

Efeito da ingestäo de lactose no desenvolvimento corporal: estudo em ratos / Effect of lactose ingestion on body development: study in rats

Ratas mäes e filhotes foram alimentados com dietas contendo como fomnte protéica: caseína ou arroz-feijäo (AF). A presença de lacose nestas dietas melhorou o desenvolvimento dos animais quando a fonte proteíca foi caseína, mas näo AF. Sugere-se que a lactose deve ser mantida na dieta o tempo todo sem descontinuidade, e de que provavelmente concentraçöes inferiores de lactose poderiam beneficiar também o grupo AF, desde que o limiar de "lactase" intestinal neste caso é mais baixo. Observou-se também que a evoluçäo intestinal inicialmente se dá por aumento do peso e comprimento (até o desmame) entretanto, após desmame o intestino delgado continua a aumentar de peso, mas já näo de comprimento