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  • Amazonas  (1)
  • Colon absorption  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Diseases of the colon & rectum 40 (1997), S. 478-482 
    ISSN: 1530-0358
    Keywords: Peptide YY ; Intraluminal ; Colon absorption ; Thiry-Vella fistula
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract INTRODUCTION: Peptide YY (PYY) is a 36 amino acid hormone released into the circulation and lumen of the intestine after a meal. Previous studies have shown that exogenous administration of intravenous PYY stimulates water and electrolyte absorption in both the small and large intestines. The purpose of this study was to examine the effects of intraluminal administration of PYY on colonic absorption of electrolytes and water. METHODS: Six conditioned 25-kg dogs had 20 cm of colonic Thiry-Vella fistulae surgically constructed under general anesthesia. After a two-week recovery period, the animals received intraluminal PYY at 600 pmol/kg/hour after a 90-minute steady-state basal period. The Thiry-Vella fistulae were perfused with an isotonic buffer solution containing [14C]polyethylene glycol as a volume marker. Ion and water transport were measured every 15 minutes. RESULTS: On intraluminal infusion of PYY, increased absorption of water, sodium, and chloride was observed in the colon. A twofold increase in absorption rates occurred compared with basal rates lasting more than one hour after cessation of intraluminal PYY (N = 6;P 〈0.05 vs. basal by analysis of variance). CONCLUSION: PYYsecreting cells of the colon may contribute to the regulation of absorption after a meal. Exogenous administration of intraluminal PYY may also be a therapeutic treatment modality for malabsorption.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5036
    Keywords: Amazonas ; Denitrification ; N-conservation mechanisms ; N-cycling ; N2-fixation ; Oxisol ; Rainforest ; Venezuela
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Resumen Los contenidos y flujos de nitrógeno, incluyendo fijación de nitrógeno y denitrificación, se midieron en un bosque lluvioso tropical que crece sobre oxisoles en el Territorio Amazonas de Venezuela. El contenido de nitrógeno era comparable con el de bosques templados, pero era más elevado que en un bosque adyacente sobre spodosoles. Los flujos eran más elevados que en bosques de zonas templadas, pero más bajos que en otro bosque tropical de suelos más fértiles. A pesar de que el nitrógeno era abundante, esto no significa que este elemento no podría ser un factor limitante para la agricultura si el bosque se corta, y se cultiva la tierra. Los mecanismos de fijación y conservación de nitrógeno dependen de la estructura del bosque no perturbado, y la destrucción del bosque eventualmente disminuiría el suministro de nitrógeno al suelo.
    Notes: Abstract Standing stocks and fluxes of nitrogen, including nitrogen fixation and denitrification, were measured in a tropical rainforest on Oxisol in the Amazon Territory of Venezuela. The standing stock of nitrogen was comparable to that of temperate forests, but was higher than that in an adjacent forest on Spodosol. Fluxes were higher than in forests in the temperate zone, but lower than in another tropical forest on more fertile soil. Even though nitrogen was abundant, this does not mean that nitrogen could not be limiting to agriculture if the forest is cleared and the land cultivated. The nitrogen fixing and nitrogen conserving mechanisms are dependent upon the structure of the undisturbed forest, and destruction of the forest would eventually decrease the input of nitrogen to the soil.
    Type of Medium: Electronic Resource
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