Riveau Gilles

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Au cours de l'adaptation de deux poissons euryhalins à des milieux hyper- ou hypotoniques, la teneur en eau du tissus musculaire ne varie pas en dépit des modifications de la pression osmotique du plasma sanguin. Les acides aminés et particulièrement la glycine, l'alanine et une amine la taurine, paraissent impliqués dans ce processus de régulation de la(More)
Rabbit kidney cortex slices behave an osmometers when withstanding hyperosmotic or hyposmotic shocks of amplitude up to pi 1/pi 2 = 1.25. For hyposmotic shocks of amplitude larger than or equal to pi 1/pi 2 = 1.50, the maximum swelling achieved is less than what can be expected on the basis of the van't Hoff relation, thereby indicating that a volume(More)
Electrical breakdown of cell membranes is interpreted in terms of an electro-mechanical model. It postulates for certain finite membrane areas that the actual membrane thickness depends on the voltage across the membrane and the applied pressure. The magnitude of the membrane compression depends both on the dielectric constant and the compressive, elastic(More)
Sodium transport processes in the branchial epithelium of euryhaline crustaceans have been investigated using a perfused preparation of gills isolated from Chinese crabs Eriocheir sinensis acclimated to dilute (FW) and to concentrated (SW) media. The results clearly establish the existence of a functional difference between the different pairs of branchiae(More)
It is now generally recognized that cells submitted to hypo-osmotic conditions undergo an initial and rapid phase of swelling that is followed by a slower phase during which cell volume resumes values close to control. This process of regulatory volume decrease (RVD) has been up to now essentially discussed in terms of control of the intracellular amount of(More)
The volume regulation process at work in rabbit kidney cortex slices submitted to hypo-osmotic media show both a swelling limitation and a volume readjustment phase. Swelling limitation is Na+ dependent and is blocked by ouabain 10−3 M. There is, however, no need to implicate the activity of a ouabain sensitive Na+/K+ pump in this process.
A variety of mechanisms have been considered in different cell types to account for this loss of KCI. These include changes in activity of i) a KCI co-transport system as i~ s~veral red blood cells (4, 5, 6); 2) a K-/Hantiporter as in Amphiuma red blood cells (7, 8) and 3) separate K + and Clconductive pathways as in mouse Ehrlich cells (9) or human(More)
Using the electron spin resonance method, the effect of antioxydants on the number of natural organic free radicals is studied in the case of the diaphragm of the Rat. The effect observed shows an important decrease in the free radical concentration, which may, in the case of ascorbic acid and BHT, lead to their complete disappearance. These results are(More)
Application of an hypo-osmotic shock to isolated axons ofCarcinus maenas induces a decrease in the intracellular content of K+, Na+ and Cl−. The changes in Na+ and Cl− levels are only transitory while the K+ level reaches new steady-state value much lower than the control. The modification of K+ concentration cannot be ascribed only to a simple dilution(More)