Some of the acidic reagents or medicines (i. e. HCl,GSH & GSSG, Vit. C,Vit. B_5) and basic reagents (Tris) were used to regulate the pH of water soluble protein and urea soluble protein solution of human lenses.
Clinical studies described here show that perfluoropolyether phosphate behaves as a very mild acidic agent, being effective in decreasing tile pH without increasing tile collateral effects of acidic compositions.
A 30-membered library of coumarins has been synthesized in a microwave-assisted Pechmann reaction using neat trifluoroacetic acid both as an acidic reagent and a reaction medium.
A sample of Phyllostachys makinoi was investigated by analysis of its chemical composition and electron microscopic observations of the cell wall structure before and after extraction as well as degradation procedures. The quantitative determination resulted in 2.6% extractives, 25.5% lignin, 45.3% alpha-cellulose, and 24.6% pol-yoses. The main polyose is an arabinoxylan with a Xyl: Ara ratio of about 17:1. The electron micrographs show a lamellar deposition of lignin and polyoses within the secondary walls...
Some of the acidic reagents or medicines (i. e. HCl,GSH & GSSG, Vit. C,Vit. B_5) and basic reagents (Tris) were used to regulate the pH of water soluble protein and urea soluble protein solution of human lenses. At a centain pH,the lens protein solution appears opalescence, the pH of opacity solution which is measured by pH meter is around 5.6-6. 3. The opalescence of water soluble and urea soluble lens protein solution of human fetal, adult and cataractous lenses were also determined by gradient acidic and...
OBJECTIVE:To study the stability of 667ppm PVP Ⅰ in the buffer solution with different pH and temperature.METHOD:Determined effective idion concentration after diluted 0.200g PVP Ⅰ in the buffer solution with different pH and stated it with different temperature.RESULTS:The povidone idione solution was more unstable in higher pH and temperature.When the temperature was 50℃ and the pH was 8,after 15 minutes the effective idine concentration dropped to zero.CONCLUSION:The results showed the PVP Ⅰ was dilu...