Fluidity limit

SHAPIRO, A.P. 8c PROBSTEIN, R.F. 1992. Random packings of spheres and fluidity limits of monodisperse and bidisperse suspensions. Phys. Rev. Lett. 68, 1422—1425. 

Conventional dynamic fluidity limit, Pj, serving as a dynamic characteristic of the catalyst paste, was defined from the catalysts paste consumption dependence on pressure... 

The nature of plasticizer has a greater impact on the conventional dynamic fluidity limit and the plastic viscosity of catalyst pastes. Fig.5 presents the dependence of the catalyst paste consumption versus the pressiu-e, which shows that in the presence of glycerine the pastes have a better structiu. The catalyst... 

The fluidity of the cellular membrane presents a limiting factor at low temperatures. After a decrease in temperature, membranes are too rigid and must therefore be desaturated. Normally, membranes are in a liquid crystalline form... 

Cholesterol modifies the fluidity of membranes. At temperatures below the T, it interferes with the interaction of the hydrocarbon tails of fatty acids and thus increases fluidity. At temperatures above the T, , it limits disorder because it is more rigid than the hydrocarbon tails of the fatty acids and cannot move in the membrane to the same extent, thus timiting fluidity. At... 

Solarization process increases soil temperatures up to levels lethal to many plant pathogens and pests and, therefore, direct thermal inactivation is the most important and normally expected mechanism. Some studies on the biochemical bases of sensitivity of organisms to high temperatures hypothesized that heat sensitivity is related to small differences in cell macromolecules, leading to a lethal increase of intra-molecular hydrogen, ionic, and disulfide bonds (Brock 1978). Sundarum (1986) suggested a reduced cell membrane function beyond an upper limit fluidity... 

In general the sphingolipids are located on the exterior face of a membrane while the phospholipids make up the inner face. This is understandable when we recall that sphingolipids include the gangliosides and cerebrosides whose polar ends contain carbohydrates or complex carbohydrate derivatives. The large number of chiral centers in carbohydrate molecules offer a complex pattern on the surface of the membrane which can impart a large degree of specificity for a particular cell type. The composition and limited fluidity of the bilayer make the entire membrane asymmetric, that is, different on the inner and outer layers or leaflets. 

Solid composite propellants are usually rich in combustible ingredients and the amount of oxidant is usually limited by the mechanical properties of the mixtures. Careful c hoice of components is needed to obtain high loadings without jeopardizing fluidity in mixing and creating discontinuities in the binder. A common procedure consists of using oxidants in two or more sizes. 

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