On the use of critical gradient models in fusion plasma transport studies

2006 ◽  
Vol 13 (6) ◽  
pp. 062301 ◽  
Author(s):  
B. A. Carreras ◽  
V. E. Lynch ◽  
B. Ph. van Milligen ◽  
R. Sánchez
Keyword(s):  
Plasma Transport ◽  
Fusion Plasma ◽  
Transport Studies ◽  
Gradient Models

scholarly journals Boundary plasma transport studies on TFTR

1991 ◽  
Author(s):  
C.S. Pitcher ◽  
P.C. Stangeby
Keyword(s):  
Plasma Transport ◽  
Transport Studies ◽  
Boundary Plasma

A distributed model of peritoneal-plasma transport: tissue concentration gradients

1985 ◽  
Vol 248 (3) ◽  
pp. F425-F435 ◽  
Author(s):  
M. F. Flessner ◽  
J. D. Fenstermacher ◽  
R. L. Dedrick ◽  
R. G. Blasberg
Keyword(s):  
Large Intestine ◽  
Tissue Concentration ◽  
Abdominal Cavity ◽  
Plasma Transport ◽  
Distributed Model ◽  
Concentration Profiles ◽  
Concentration Gradients ◽  
Transport Studies ◽  
Dialysis Solution ◽  
Tissue Fraction

Peritoneal dialysis transport studies were carried out in anesthetized rats. Injections of [14C]EDTA were made by intravenous bolus or intraperitoneal dialysis solution, and blood and peritoneal fluid samples were collected for 1 h. After death and rapid freezing of the animal, transverse sections through the abdominal cavity were cut for quantitative macroautoradiography. The plasma-to-peritoneal transport experiments with a clinical dialysis solution resulted in essentially horizontal concentration profiles versus distance in all tissues except large intestine. Estimates of the extracellular tissue fraction were: small intestine, 0.34; large intestine, 0.28; stomach, 0.30; uterus, 0.66; liver 0.35; diaphragm, 0.16; and anterior abdominal wall, 0.15. Similar experiments with an isotonic salt solution resulted in larger (13-300%) extracellular fractions in all tissues. In contrast, peritoneal-to-plasma transport studies demonstrated decreasing concentration profiles in all visceral tissues, with the first 90% of the gradient contained in the initial 400 micron of tissue from the peritoneum. Parietal tissue gradients were less steep and had higher concentration levels deep within the tissue than visceral tissues. Computer simulations using a distributed model approach compared favorably with the experimental measurements and established the validity of this approach.

Electron probe x-ray microanalysis and electron microscopy of amino acid absorption and transport by the small intestine: inhibition by chemical poisons and correlation to the elemental composition of the epithelial cells

1986 ◽  
Vol 44 ◽  
pp. 134-135
Author(s):  
A. J. Tousimis
Keyword(s):  
Small Intestine ◽  
Amino Acid ◽  
Epithelial Cells ◽  
Elemental Composition ◽  
Isotope Labeling ◽  
Structural Components ◽  
X Ray ◽  
Human Small Intestine ◽  
Transport Studies

The elemental composition of amino acids is similar to that of the major structural components of the epithelial cells of the small intestine and other tissues. Therefore, their subcellular localization and concentration measurements are not possible by x-ray microanalysis. Radioactive isotope labeling: I131-tyrosine, Se75-methionine and S35-methionine have been successfully employed in numerous absorption and transport studies. The latter two have been utilized both in vitro and vivo, with similar results in the hamster and human small intestine. Non-radioactive Selenomethionine, since its absorption/transport behavior is assumed to be the same as that of Se75- methionine and S75-methionine could serve as a compound tracer for this amino acid.

Speeded Probed Recall Is Affected by Grouping

2015 ◽  
Vol 62 (6) ◽  
pp. 385-394
Author(s):  
Sergio Morra ◽  
Valentina Epidendio
Keyword(s):  
Serial Order ◽  
Word Lists ◽  
Order Representation ◽  
Interstimulus Intervals ◽  
Gradient Models

Abstract. Most of the evidence from previous studies on speeded probed recall supported primacy-gradient models of serial order representation. Two experiments investigated the effect of grouping on speeded probed recall. Six-word lists, followed by a number between 1 and 6, were presented for speeded recall of the word in the position indicated by the number. Grouping was manipulated through interstimulus intervals. In both experiments, a significant Position × Grouping interaction was found in RT. It is concluded that the results are not consistent with models of order representation only based on a primacy gradient. Possible alternative representations of serial order are also discussed; a case is made for a holistic order representation.

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