High SI Values Research Articles

Histochemical studies on the architecture of rat temporal muscle

The histochemical organization observed in sections of the temporal muscle of adult malerats was investigated by a succinicdehydrogenase staining (SDH) method. Three distinct muscle fibertypes were also distinguished in the temporal muscle. Significant differences in the average OI and SI values were found in different regions (from origin to insertion), and in different parts (the anteriortemporal, posterior temporal and deep temporal muscle). Moreover, differences were found in thepercentage distributions of OI and SI of different primary fasciculi in each of the temporal muscle. Ingeneral, the average OI and SI values were highest in the deep temporalis, intermediate in the anteriortemporalis and lowest in the posterior temporalis. In aging rats the three types of muscle fibers wereeasily identified, and differences in the average OI and SI values in different muscle parts were foundto be greater. In addition, primary fasciculi with high OI and SI values or those with low OI and SIvalues were more numerous than in young adult rats.

Stability of Soil Smectite From a Houston Black Clay

AbstractThe stability of smectite separated from a Houston Black clay soil was studied by solubility methods in an acid environment. High Silicon levels (supersaturated with respect to amorphous Si) probably were due to dissolution of the smectite and slow precipitation of amorphous Silicon. Also, mica and vermiculite impurities may have contributed to high solution Si values. Solubility data from equilibrium solutions of various treatments and chemical structural analyses permitted the formulation of a solubility equation. The ΔG°f for the Houston Black smectite computed from pK values was —2433.9 ± 0.8 kcal/mole. The stability of this clay could then be determined by calculations for any desired solution environment. It was found that under some conditions this soil smectite could be more stable than Belle Fourche and Aberdeen montmorillonites. Therefore, it appears that this soil clay has the required stability area in which it can form in nature.