Food hydrocolloids are sold as powders so they must be dissolved before use. In modern manufacturing practice, rapid dissolution can be an important specification. However, quantifying dissolution kinetics is a problem, because when lumps form the process becomes irreproducible, partly because lumps tend to stick to the stirrer. This paper presents a simple method for determining the dissolutio...

The tightness of the casing-rock formation interface is one most important elements drilling and cementing jobs. In absence required tightness, there a risk gas migration directly to ground, groundwater or atmosphere. order eliminate this type uncontrollable unfavorable flows, casing column sealed with cement slurry in annular space beyond casing. Cement displaces mud present space, although ca...

We systematize and review the mathematical models for use in oscillating-cup viscometry to solve different problems: analysis of fluid flow viscometer oscillations, estimation rheological constants density, study without taking into account traditional assumptions this method. The full model cup bob a oscillating-plate are also considered.

A technique based on deducing the viscosity of serum from that of plasma was compared with the commonly used Clauss method. The two methods correlated closely (r = 0.914). The reproducibility of the viscometric method was slightly poorer than the Clauss technique at low fibrinogen concentrations, equal to that at medium fibrinogen concentrations, and marginally better at high concentrations. Fi...

Xanthan gum is an anionic heteropolysaccharide produced by the bacterium Xanthomonas campestris. Synergistic galactomannan – xanthan gum interactions are used for commercial and technological applications. Prosopis seed gum were mixed with xanthan gum (Sigma, U.S.A) at the following ratios 100/0, 80/20, 60/40, 40/60, 20/80, 0/100 (0.5 % ). Solutions (w/w) were prepared and heated for 1 h. After...

AIM To study effects of a perfluorocarbon emulsion on plasma and whole human blood viscosity in the presence of albumin or modified fluid gelatin. MATERIAL AND METHODS We investigated the effects of several PFC concentrations on plasma and whole blood viscosity in the presence of human albumin solution (HAS) or modified fluid gelatine (MFG; Gelofusine) to obtain three PFC emulsion concentrati...