Short-circuit current and ionic fluxes in the isolated colonic mucosa ofBufo arenarum
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چکیده
منابع مشابه
Basal and amiloride-induced short-circuit current across isolated toad skin (Bufo arenarum).
We have previously demonstrated that amiloride (amil) addition to the isolated ventral pelvic (VPel) skin of Bufo arenarum toad induces negative short-circuit current values, which are equivalent to the isotopically measured net chloride transport. In the present work, we found that exposure of various regions of toad skin to amil yielded different values of short-circuit current (aSCC): negati...
متن کاملPotential, Current, and Ionic Fluxes across the Isolated Retinal Pigment Epithelium and Choroid
A flux chamber was utilized for in vitro studies of a membrane formed by the retinal pigment epithelium and choroid of the eye of the toad (Bufo arenarum and Bufo marinus). A transmembrane potential of 20 to 30 mv was found, the pigment epithelium surface positive with respect to the choroidal surface. Unidirectional fluxes of chloride, sodium, potassium, and calcium were determined in the abse...
متن کاملIon Fluxes and Short-Circuit Current in Internally Perfused Cells of Valonia ventricosa
Ion transport in the giant celled marine alga, Valonia ventricosa, was studied during internal perfusion and short-circuiting of the vacuole potential. The perfusing and bathing solutions were similar to natural Valonia sap and contained the following concentrations of major ions: Na 51, K 618, and Cl 652 mM. The average short-circuit current (I(sc)) was 97 pEq/cm(2) sec (inward positive curren...
متن کاملRole of anions in nitric oxide-induced short-circuit current increase in isolated porcine ciliary processes.
PURPOSE To investigate how nitric oxide (NO) modulates short-circuit current (Isc) in isolated porcine ciliary processes. METHODS Isc changes (Ussing-type chamber) induced either by the NO donors SNP or SIN-1, or by the cGMP analogue 8-pCPT-cGMP were assessed. The effect of inhibitors of guanylate cyclase (10 microM ODQ, 100 microM LY83583), protein kinase G (30 microM Rp-8-pCPT-cGMP, 3 micro...
متن کاملKaryometry of the colonic mucosa.
OBJECTIVE The study summarizes results of karyometric measurements in epithelial cells of the colorectal mucosa to document evidence of a field effect of preneoplastic development among patients with colorectal adenocarcinoma or adenoma. METHODS Karyometric analyses were done on high-resolution images of histologic sections from 48 patients with colorectal adenocarcinomas and 44 patients with...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1970
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1970.sp009028