Results 301 to 310 of about 1,610,574 (326)

Transportation of Biological Materials

1987
As the use of genetically altered microorganisms increases, so will the need to transport these materials. Although the shipment of bioengineered materials raises fewer direct environmental concerns than intentional release or scale-up manufacturing, some important regulatory questions are presented.
Iver P. Cooper, Jeffrey N. Gibbs, Bruce F. Mackler   +2 more
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Transport Through Biological Membranes

Annual Review of Physiology, 1959
The following topics are omitted from this review: transport across plant membranes, capillary permeability, and participation of ion transfer in cardiac activity. Two symposia of general interest were published: Metabolic A spects of Transport A cross Cell Membranes (200) and Hormonal Control of Water and Salt-Electrolyte Metabolism in Vertebrates (33)
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Efficiency of Ion Transport in Biological Systems [PDF]

Nature, 1957
THE idea that active ion transport is linked directly to an electron-transferring respiratory system was first expressed clearly by Stiehler and Flexner1 and has since been elaborated by other investigators2,3. On the basis of this hypothesis, the maximum value of the ratio (ion pairs transported/oxygen consumed) = 4 4,5, since four electrons are ...
J. F. Sutcliffe, D. P. Hackett
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Biological transport processes

1989
Transport processes are an integral part of biological function. For example, the energy converting processes which we have discussed in the previous chapters need a continuous supply of substrates and a continuous disposal of products and waste. It is evident that there can be no respiration when there are no means for oxygen and substrates (glucose ...
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Transport Mechanisms of Biological Colloids^a

Annals of the New York Academy of Sciences, 1986
An effort was made to distinguish among various mechanisms by which colloidal particles can be transported through liquid solutions. Figures 1-3 provide a visual (Figure: see text) summary of these differences. The various "phoretic" motions (electrophoresis, diffusiophoresis, osmophoresis) differ from sedimentation in that the driving forces operate ...
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Reactive Sites and Biological Transport

1961
Publisher Summary Biological barriers are studded with a variety of reactive sites that favor the passage of suitable molecules; in some cases, mechanisms that seem inherently improbable deliver the molecules from these sites against electrochemical gradients, either normally or when a gradient of an analog is artifically produced. In their aggregate,
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Water Transport in Biological and Artificial Membranes

Archives of Internal Medicine, 1972
The transport of water across biological membranes is a process of considerable theoretical and practical importance. Classical interpretations of the mechanism of this transport have centered around the hypothesis of aqueous membrane pores. However, more recent evidence indicates that the possible presence of unstirred layers adjacent to membranes ...
Thomas E. Andreoli, James A. Schafer
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Adaptation and Optimization of Biological Transport Networks

Physical Review Letters, 2013
It has been hypothesized that topological structures of biological transport networks are consequences of energy optimization. Motivated by experimental observation, we propose that adaptation dynamics may underlie this optimization. In contrast to the global nature of optimization, our adaptation dynamics responds only to local information and can ...
David Cai, David Cai, David Cai, Dan Hu
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Iron Transport Across Biologic Membranes

Nutrition Reviews, 2009
Iron is essential for life, but is toxic in excess. Nearly all organisms have therefore developed regulated mechanisms for efficient transport of iron into cells. This paper reviews the current understanding of iron transport, focusing on valuable lessons from studies of yeast iron transport and the discovery of the first mammalian transmembrane iron ...
Mark D. Fleming, Nancy C. Andrews, Hiromi Gunshin   +2 more
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A transport for a biological sciences department

Journal of Biological Education, 1980
The article describes a Bedford high top van converted to a multipurpose laboratory and transport for a college biological sciences department.
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