Skip to content

Active Transport through Animal Cell Membranes - download pdf or read online

By P.G. LeFevre

ISBN-10: 3211803874

ISBN-13: 9783211803875

ISBN-10: 3709157684

ISBN-13: 9783709157688

Show description

Read Online or Download Active Transport through Animal Cell Membranes PDF

Best biology books

Biology of Chrysomelidae by Pierre Jolivet (auth.), P. Jolivet, E. Petitpierre, T. H. PDF

As in such a lot teams of bugs, medical learn at the Chrysomelidae all started in Europe in 1758, with the outline of some genera and species via the Scandinavian entomologists C. von Linne, I. C. Fabricius, and others. because the nineteenth century dawned, many systematic entomologists took up the research of chrysomelid beetles, including different teams of beetles, and lots of new species and genera have been defined from all elements of the realm.

New PDF release: Methods in cell biology / Vol. 46, Cell death / edited by

Mobilephone demise presents a present and finished selection of tools for the examine of phone dying. utilizing a various diversity of technical methods and version structures, the chapters during this quantity disguise issues from the mobile and organismal to the molecular and anatomical. within the culture of this long-standing sequence, this volume's basic recipes and greater than a hundred tables and figures make the learn of phone dying available throughout lifestyles technology disciplines.

Additional resources for Active Transport through Animal Cell Membranes

Example text

Examining the K + level in the fluid in the Malpighian tubules of eight species of insects (in five different orders), RAMSAY (1953) noted that it always exceeded the level in the haemolymph, while the Na+ gradient was in the opposite direction. Considering the p. d. across the tubular wall, he took this· as evidence of an active extrusion of K + into the tubules. In the mammalian kidney, although the gross fact of reabsorption of salts from the tubule lumen has been appreciated for many years, it was only recently that the question of a cation-transport system here has been given direct attention.

The observations of MUDGE et al. (1949) on Na+ excretion in dogs with severe urea diuresis showed that this ion is reabsorbed even against very considerable concentration gradients. Mercurial diuretics depressed the absolute rate of reabsorption, but did not alter the concentration ratios that could be maintained across the tubular wall. PITTS et al. (1948) concluded from extensive observations in acidotic humans that the urinary acidification is largely accomplished by exchange of H+ for the Na+ reabsorbed in the tubule; the filtered buffer ions could not in themselves account for the quantity of acid eliminated.

Later (SACKS 1944 a, b) it was noted that in the fasting cat the specific activity of the muscle glucose-6-monophosphate (G-6-P) was higher at 2-4 hours after the p32 injection than at 24 hours, whereas that of the other primary organic phosphates continued to rise in relation to the G-6-P. This was taken to indicate that at least part of the G-6-P remained in ready contact with the extracellular compartment, and was probably held at the cell surface, as by adsorption. This "mobilization on the muscle cell membrane·' of G-6-P was distinctly enhanced by glucose administration, and was seen only in fasted cats, not in "post-absorptive" cats.

Download PDF sample

Active Transport through Animal Cell Membranes by P.G. LeFevre

by Mark

Rated 4.93 of 5 – based on 6 votes