Journal ArticleDOI
Standing-gradient flows driven by active solute transport
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The present study of the standing gradient model shows that a relatively simple analytic treatment preserves the main features of the equations governing coupled solute and water flow in a long channel closed at one end.About:
This article is published in Journal of Theoretical Biology.The article was published on 1970-11-01. It has received 59 citations till now. The article focuses on the topics: Fluid transport & Water flow.read more
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Book ChapterDOI
Physical Aspects of Water Relations of Plant Cells
U. Zimmermann,E. Steudle +1 more
TL;DR: The chapter concludes that the experimental evidence and the theoretical concepts presented reveal the intricate relationships among water transport, turgor pressure, active and passive solute transport processes, and the elastic properties of the cell wall, which themselves control growth in plant cells.
Journal ArticleDOI
Osmotic water flow in leaky epithelia.
TL;DR: Progress in this field requires new methods: to resolve osmotic transients; to separate transcellular and transjunctional water flows; and to measure solute concentrations in lateral intercellular spaces directly.
Journal ArticleDOI
Size and shape of the lateral intercellular spaces in a living epithelium.
Kenneth R. Spring,Arvid Hope +1 more
TL;DR: The lateral intercellular spaces of Necturus gallbladder epithelium were seen and measured while the living tissue was perfused in a new chamber and the compliance of the lateral cell membranes was calculated.
Journal ArticleDOI
Solute-solvent coupling in epithelia: a critical examination of the standing-gradient osmotic flow theory.
TL;DR: An examination of the standing-gradient osmotic flow theory by numerical solution of the differential equation describing the velocity profile in a local Osmotic space, and by use of an analytical approximation to the emergent osmolarity, indicates that abnormally high values for the osmosis permeability of the cell membranes are required if the secretion is to be isotonic.
Journal ArticleDOI
Solute-solvent coupling in epithelia: an electro-osmotic theory of fluid transfer
TL;DR: An epithelial model has been studied in which the volume flow is almost entirely due to electro-osmotic coupling in the boundary membranes, and it appears that both the water and salt flow rate are dependent upon its magnitude and ion specificity.
References
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Book
Elementary Differential Equations and Boundary Value Problems
TL;DR: In this article, elementary differential equations and boundary value problems are studied in the context of boundary value problem, where boundary value is defined as a function of the boundary value of the elementary differential equation.
Journal ArticleDOI
Standing-Gradient Osmotic Flow A mechanism for coupling of water and solute transport in epithelia
TL;DR: The results suggest that water-to-solute coupling in epithelia is due to the ultrastructural geometry of the transport route, and a standing-gradient system can yield hypertonic fluids whose osmolarities are virtually independent of transport rate over a wide range.
Journal ArticleDOI
The Salt-Secreting Gland of Marine Birds
TL;DR: Marine birds possess salt-secreting nasal glands which produce hypertonic solutions of sodium chloride in response to osmotic loads such as ingestion of sea water, but it is not possible to explain the high concentrations of the secreted fluid as the result of a countercurrent multiplier system.
Journal ArticleDOI
Ultrastructure of the crocodile kidney (Crocodylus acutus) with special reference to electrolyte and fluid transport
TL;DR: The crocodile Tubular cells were found to differ from the mammalian tubular cells in that they do not have basal infoldings, but instead have open lateral spaces between the cells, similar in many aspects to those found in the mammalian gallbladder.