Release of Small Polyuronides from Nitella Cell Walls during Ionic Exchange
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چکیده
منابع مشابه
Release of Small Polyuronides from Nitella Cell Walls during Ionic Exchange.
Mono-divalent ion exchange in isolated cell walls of Nitella flexilis (L.) Ag. induces a marked loss of wall polymers and a decrease in the wall cationic exchange capacity. These data correlate with the replacement in the walls of adsorbed Mn(2+) by Na(+) ions. Boiling wall samples in methanol for 1 h or keeping the ionic solutions chilled to 4 degrees C does not inhibit the cell wall polymer l...
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The ionic state of single internodal cells of a fresh water characean, Nitella translucens, has been studied. In mature cells the vacuolar concentrations were 78 mM K, 60 mM Na, and 151 mM Cl, compared with concentrations of 0.1 mM K, 1.0 mM Na, and 1.3 mM Cl in the bathing medium. The results suggest an active influx of potassium and an active efflux of sodium at the plasmalemma, and an active...
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The Nilella intermodal cell is formed by a division of the segment cell, the latter being a direct derivative of the shoot apical cell. The internodal cell is remarkable in that it elongates from an initial length of about 20 microns to a mature length of about 60 millimeters. The structures of the apical and segment cells, and the internodal cells in all stages of development were examined wit...
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From our theoretical treatment which is an extension of the classical Donnan theory, we have estimated the rational selectivity coefficients of the carboxylic groups of the walls during exchanges of divalent ions against monovalent ones (i.e. calcium and potassium or calcium and sodium ions). These coefficients express the interactions between the different ions, those between the counter-ions ...
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When protons are exchanging for bivalent cations (Cu(2+), Zn(2+), or Ca(2+)) on the carboxylic groups of Nitella flexilis cell wall, the values of the respective global equilibrium constants do not change up to a protonation degree of 80%. These values drastically increase at higher proton concentrations and tend to approximately 3.4, which is the intrinsic pK value of the constitutive alpha-d-...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1992
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.100.2.846