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Chloride Channels and Carriers in Nerve, Muscle, and Glial Cells (Hardcover, 1990 ed.)
Loot Price: R5,951
Discovery Miles 59 510
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Chloride Channels and Carriers in Nerve, Muscle, and Glial Cells (Hardcover, 1990 ed.)
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This is a book about how Cl- crosses the cell membranes of nerve,
muscle, and glial cells. Not so very many years ago, a pamphlet
rather than book might have resulted from such an endeavor! One
might ask why Cl-, the most abundant biological anion, attracted so
little attention from investigators. The main reason was that the
prevailing paradigm for cellular ion homeostasis in the 1950s and
1960s assigned Cl- a ther modynamically passive and unspecialized
role. This view was particularly prominent among muscle and
neuroscience investigators. In searching for reasons for such a
negative (no pun intended) viewpoint, it seems to us that it
stemmed from two key experimental observations. First, work on frog
skeletal muscle showed that Cl- was passively distributed between
the cytoplasm and the extracellular fluid. Second, work on Cl-
transport in red blood cells confirmed that the Cl- transmembrane
distribution was thermodynamically passive and, in addition, showed
that Cl- crossed the mem brane extremely rapidly. This latter
finding [for a long time interpreted as being the result of a high
passive chloride electrical permeability(? CI)] made it quite
likely that Cl- would remain at thermodynamic equilibrium. These
two observations were gener alized and virtually all cells were
thought to have a very high P Cl and a ther modynamically passive
Cl- transmembrane distribution. These concepts can still be found
in some physiology and neuroscience textbooks.
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