Induction of δ-aminolaevulinate synthetase under environmental-stress conditions

Effectiveness of Dry Eye Therapy Under Conditions of Environmental Stress

PURPOSE Dry eye is often characterized by increased tear evaporation due to poor tear film quality, especially of the lipid component of the tear film. Using an environmental chamber to induce environmental stress, this study compared the effect of three lubricant eye drops on various aspects of tear physiology in a crossover design (evaporation was the principal outcome measure). METHODS Thr...

Control of 5-aminolaevulinate synthetase activity in Rhodopseudomonas spheroides. Binding of pyridoxal phosphate to 5-aminolaevulinate synthetase.

1. Pyridoxal 5'-phosphate is a cofactor essential for the enzymic activity of aminolaevulinate synthetase from Rhodopseudomonas spheroides. It also aids activation of the low-activity enzyme by trisulphides such as cystine trisulphide, whereas inactivation of enzyme is facilitated by its absence. 2. The fluorescence spectrum of purified high-activity enzyme is that expected for a pyridoxal phos...

Oxidative Stress – Environmental Induction

the effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)

cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...

A partial reaction of delta-aminolaevulinate synthetase from Rhodopseudomonas spheroides.

microsomal fraction. The properties of the microsomal phosphorylcholinetransferase enzyme are similar to those reported for that from spinach leaves (Devor & Mudd, 1971), except that exogenous diglyceride was necessary for maximal rates, presumably because the activity of endogenous lipases was not high enough to generate a sufficient amount. These results indicate that, whereas the CDP-base pa...