Duodenal Flux
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. NUTRITIVE VALUE OF DIETS BASED ON FRESH RYEGRASS (Lolium multiflorum, LAM.) FORAGE SUPPLEMENTED WITH NITROGEN OR ENERGY / VALOR ALIMENTAR DE DIETAS COM AZEVÉM (Lolium multiflorum, LAM.) E SUPLEMENTAÇÃO NITROGENADA OU ENERGÉTICA
The present study was carried out to determine the effects of supplementing fresh ryegrass forage based diets with starch, rumen degradable or undegradable protein sources on intake, digestion and nitrogen retention, rumen digestibility and the duodenal nitrogen flow. Ten Corriedale lambs (26 kg mean body weight), kept in metabolic cages were used in a 5 x 5
Publicado em: 2008
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2. Intestinal folate absorption: I. 5-Methyltetrahydrofolic acid
Intestinal absorption of the monoglutamate form of the principal dietary and circulating folate compound, 5-methyltetrahydrofolic acid (5-MTHF), was studied in the rat utilizing a synthetic highly purified radiolabeled diastereoisomer. Chromatography confirmed that the compound was not altered after transfer from the mucosa to the serosa. Accumulation agains
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3. A Cl- conductance sensitive to external pH in the apical membrane of rat duodenal enterocytes.
1. The pH dependence of a chloride conductance in the apical membrane of rat duodenal enterocytes was examined. 2. A stepwise reduction of both internal and external pH from 7.4 to 6.8 resulted in a significant stimulation of 36Cl flux driven by an inside-positive membrane potential. 3. A stepwise reduction in pH had no significant effect upon other paramete
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4. Intestinal transport of water and electrolytes during extracellular volume expansion in dogs
The effects of extracellular fluid volume expansion on intestinal transport of salts and water were studied in dogs by perfusing loops of bowel in vivo. Saline loading caused depression of duodenal and jejunal absorption with net secretion of salt and water into the lumen. Studies of unidirectional transport of 22Na+ revealed that the negative net sodium flu
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5. Mechanism of hypercalciuria in genetic hypercalciuric rats. Inherited defect in intestinal calcium transport.
Excessive urine calcium excretion in patients with idiopathic hypercalciuria may involve a primary increase in intestinal calcium absorption, overproduction of 1,25-dihydroxyvitamin D3 or a defect in renal tubular calcium reabsorption. To determine the mechanism of hypercalciuria in an animal model, hypercalciuria was selected for in rats and the most hyperc
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6. Abnormal vitamin D metabolism, intestinal calcium transport, and bone calcium status in the spontaneously hypertensive rat compared with its genetic control.
Abnormalities of intestinal calcium absorption and the vitamin D axis in the spontaneously hypertensive rat (SHR) are controversial. The present report documents a reduction in circulating 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) in the 12-14-wk-old male SHR with evidence of its functional significance. Both plasma 1,25(OH)2D3 and mucosa-to-serosa duodenal cal
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7. Effects of 1,25-Dihydroxycholecalciferol on Intestinal Calcium Transport in Cortisone-Treated Rats
The administration of glucocorticoids may decrease intestinal calcium absorption in vivo and the active transport of calcium in rat duodenum in vitro. It has been suggested that this apparent “anti-vitamin D-like” effect of steroid hormones may be related to alterations in vitamin D metabolism. In order to test this hypothesis, vitamin D-deficient contro
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8. Effects of cholecystectomy on the kinetics of primary and secondary bile acids.
Removal of the gallbladder is thought to increase formation and pool size of secondary bile acids, mainly deoxycholic acid (DCA), by increased exposure of primary bile acids (cholic acid [CA], chenodeoxycholic acid [CDCA]) to bacterial dehydroxylation in the intestine. We have tested this hypothesis by simultaneous determination of pool size and turnover of