Stearic acid modification, effect

What can be done to prevent atherosclerosis For persons with a high LDL level there is little doubt that a decreased dietary intake of cholesterol and a decrease in caloric intake are helpful. While such dietary restriction may be beneficial to the entire population, controlled studies of the effect of dietary modification on atherosclerosis have been disappointing and confusing.33 A diet that is unhealthy for some may be healthy for others. For example, an 88-year old man who ate 25 eggs a day for many years had a normal plasma cholesterol level of 150-200 mg / deciliter (3.9-5.2 mM) bb Comparisons of diets rich in unsaturated fatty acids, palmitic acid, or stearic acid have also been confusing.cc cd/dd Can it be true that palmitic acid from tropical oils and other plant sources promotes atherogenesis, but that both unsaturated fatty acids and stearic acid from animal fats are less dangerous ... 

Garti, N. Wellner, E. Sarig, S. Effect of surfactants on crystal structure modification of stearic acid. J. Cryst. Growth 1982, 57 (3), 577-584. 

The activity of the 9-desaturase is also regulated by the type of fat included in the diet. The activity of the 9-desaturase is depressed, by some unknown mechanism, when rats are fed oils containing linoleic acid (Jeffcoat and James, 1977, 1978). This same effect is observed with cultured hepato-cytes isolated from rats fed linoleic acid (Jeffcoat et aL, 1979). As noted previously, the 9-desaturase may be viewed as a lipogenic enzyme, the function of which is to desaturate dietary or newly synthesized palmitic or stearic acids for deposition primarily in triglycerides. Indeed it is now well established that the activity of fatty acid synthetase (Voipe and Vagelos, 1976 Flick et aL, 1977) and the 9-desaturase are regulated in an almost identical manner by fasting and dietary modification. 

The surface energy of fibres is closely related to the hydrophility of the fibre. Some investigations are concerned with methods to decrease hydrophility. The modification of wood-cellulose fibres with stearic acid [49] causes those fibres to become hydrophobic and improves their dispersion in PR As can be observed in jute reinforced unsaturated polyester resin composites, treatment with polyvinylacetate increases the mechanical properties [50] and moisture repellence. Silane coupling agents may contribute hydrophilic properties to the interface, especially when amino-functional silanes, such as epoxies and urethane silane are used as primers for reactive polymers. The primer may supply much more amine functionality than can possibly react with the resin at the interphase. Those amines, which could not react, are hydrophilic and therefore responsible for the poor water resistance of the bonds. An effective way to use hydrophilic silanes is to blend them with hydrophobic silanes such as phenyltrimethoxysilane. Mixed siloxane primers also have an improved thermal stability, which is typical for aromatic silicones [48]. 

As seen from Table 5.3, the products modified by tita-nate NDZ-101, sodium stearate, stearic acid, and Zinc stearate acid zinc exert the highest activation index nevertheless, the modification effects of other modifiers are relatively poor. The results of contact angle also support this point. Among these four modifiers, sodium stearate modified products hold the maximum contact angle and have lower costs. ... 

A (approximately 13.6 kDa) increases passage across the BBB by almost ninefold. Of the three fatty acid derivatives analyzed (myristic, palmitic, and stearic), the stearic modification had the greatest effect. The most likely mechanism for the entry of fatty acylated polypeptides to the brain is adsorptive endocytosis. 

Patty acid (stearic, isostearic) and other polar coupling agent effects on rheology and properties of CaC03 filled polyolefins are discussed in detail in Chapter 6. The beneficial effects of maleated PP in filled PP compounds are shovm in Table 6.9. Modification of the polyolefin matrix of Table 16.2 by maleic anhydride grafting through reactive extrusion increases the tensile and fiexural and unnotched impact... 

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