Regeneration and Tolerance Factor

2005 ◽  
pp. 126-134 ◽  
Author(s):  
Rita F. Levine ◽  
Richards Derks ◽  
Kenneth Beaman
Keyword(s):  
Tolerance Factor

scholarly journals G. Czédli’s tolerance factor lattice construction and weak ordered relations

2021 ◽  
Vol 82 (2) ◽  
Author(s):  
Sándor Radeleczki
Keyword(s):  
Concept Lattice ◽  
Tolerance Factor ◽  
Macneille Completion ◽  
Lattice Construction

AbstractG. Czédli proved that the blocks of any compatible tolerance T of a lattice L can be ordered in such a way that they form a lattice L/T called the factor lattice of L modulo T. Here we show that the Dedekind–MacNeille completion of the lattice L/T is isomorphic to the concept lattice of the context (L, L, R), where R stands for the reflexive weak ordered relation $$ \mathord {\le } \circ T$$ ≤ ∘ T . Weak ordered relations constitute the generalization of the ordered relations introduced by S. Valentini. Reflexive weak ordered relations can be characterized as compatible reflexive relations $$R\subseteq L^{2}$$ R ⊆ L 2 satisfying $$R=\ \mathord {\le } \circ R\circ \mathord {\le } $$ R = ≤ ∘ R ∘ ≤ .

Relation of glucose tolerance factor to impaired intravenous glucose tolerance of rats on stock diets

1959 ◽  
Vol 196 (3) ◽  
pp. 614-618 ◽  
Author(s):  
Walter Mertz ◽  
Klaus Schwarz
Keyword(s):  
Glucose Tolerance ◽  
Water Soluble ◽  
Tolerance Factor ◽  
Brewer’S Yeast ◽  
Removal Rates ◽  
Intravenous Glucose ◽  
Brewer's Yeast ◽  
Intravenous Glucose Tolerance ◽  
Low Glucose ◽  
Glucose Tolerance Factor

Intravenous glucose tolerance tests were made on male Sprague-Dawley rats, raised on different diets. Two natural diets (McCollum's wheat-casein ration and table scraps) produced glucose removal rates of around 4%/min. or more. In rats raised on three commercial pelleted stock rations (Purina, Hunt Club, Rockland) as well as on a semipurified Torula yeast diet, low glucose removal rates of 2.5–2.8%/min. were consistently detected after 20 or more days of feeding. The results are related to the contents, in the investigated diets, of the glucose tolerance factor (GTF), a recently described, water soluble dietary agent of low molecular weight. Development of low glucose removal rates is prevented by dietary supplementation with brewer's yeast, or with GTF concentrates from brewer's yeast or pork kidney powder. The fully developed impairment is cured within 1–2 weeks by the addition of GTF concentrates to the diet. It is also reconstituted to normal within 18 hours after stomach tubing of GTF fractions of widely different degrees of purification. This curative procedure is being used as a 24-hour test for GTF.

Relation between tolerance factor and Tc in Aurivillius compounds

2001 ◽  
Vol 16 (11) ◽  
pp. 3139-3149 ◽  
Author(s):  
Donají Y. Suárez ◽  
Ian M. Reaney ◽  
William E. Lee
Keyword(s):  
Room Temperature ◽  
Ferroelectric Phase ◽  
Structural Phase ◽  
Tolerance Factor ◽  
Structural Phase Transitions ◽  
Aurivillius Phases ◽  
Ferroelectric Phase Transition Temperature ◽  
Transmission Electron ◽  
Octahedral Tilting ◽  
Permittivity Measurements

The structures and microstructures of a range of Aurivillius phases were investigated by transmission electron microscopy. Systematic rows of superlattice reflections arising from tilting of octahedra around the c axis were identified, and their intensities at room temperature were shown to diminish as the tolerance factor (t) of the perovskite blocks increased. For compounds with t's approaching 1, no superlattice reflections were observed. the paraelectric-to-ferroelectric phase transition temperature (Tc) was monitored through permittivity measurements as a function of temperature, and Tc was also shown to decrease as t increased. Consequently, the onset of octahedral tilting and Tc appeared to be strongly related Aurivillius phases. Planar defects arising from the structural phase transitions and from stacking irregularities were also discussed.

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