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47527 documents, page 1 of 4753

Étude du spectre de bruit d'un diélectrique polaire liquide

On exprime la densité spectrale énergétique des fluctuations au sein d'un diélectrique liquide en utilisant un modèle statistique dans lequel les molécules actives effectuent un mouvement de libration amorti autour d'une position moyenne qui varie de façon aléatoire au cours d'un processus ponctuel poissonnien stationnaire. Le résultat comporte, outre une formule obtenue antérieurement et confirmée par l'expérience, une partie résonnante, due au mouvement librationnel des molécules polaires, ...


"Este Artículo pertenece a la sección Arte, Letras, Espectáculos. "

Chloride and Potassium Activities in Luminal Fluid of Turtle Thyroid Follicles as Determined by Selective Ion-Exchanger Microelectrodes

Cl- and K+ activities in the follicular lumen and the intraluminal potential of the same lumen were measured simultaneously with specific liquid ion-exchanger and 3 M KCl microelectrodes, respectively, in turtle thyroid glands. The Cl- equilibrium potential between the thyroid interstitium and the lumen calculated from the measured Cl- activities was higher than the directly measured intraluminal potential. These data indicate that Cl- is actively transported out of the follicular lumen in tu...

"Después de Grotowski"

"Este Artículo pertenece a la sección Arte, Letras, Espectáculos. "


The sinus nerve or sympathetic trunk was stimulated unilaterally in one group of adult cats or Syrian hamsters while in another group the sinus nerve or sympathetic trunk was cut unilaterally and the animals were given reserpine. In a third group, atropine was administered prior to sinus nerve stimulation. All tissues were processed for the detection of primary monoamines. The carotid bodies on the operated sides were compared with those on the unoperated sides of the same animal in order to ...

Optical Activity of Biological Membranes: Scattering Effects and Protein Conformation

The following question has recently arisen in the literature concerning the interpretation of the optical activity of biological membranes: do the characteristic spectral distortions observed for diverse membrane systems reflect some common and unique aspect of membrane architecture or are they the result of scattering effects owing to the particulate nature of membranous systems? We have confirmed the latter interpretation on the basis of the following experimental observations: (a) red bloo...