Endothelial cells lining the lumen of blood vessels contain the receptors for many substances that alter the contractile tone of smooth muscle in the walls of the blood vessels. In response to their interaction with the signal substances, the endothelial cells release vasoactive factors that modify the contractile state of the vascular smooth muscle. This study was conducted to determine if end...

The detection and properties of the enzyme which converts angiotensin I to angiotensin II (converting enzyme) are reviewed. Converting enzyme, which is found principally in the lung, is probably responsible in the intact animal for the conversion of angiotensin I to angiotensin II under physiological conditions, the lung thus being the principle site of conversion. The enzyme is distributed in ...

since particulate matter (total suspended particles and particulate matter with median aerodynamic diameter less than 10 µm) is one of the important pollutants in the ambient air of tehran, the capital of iran, organic substances, inorganic substances and lead levels in tsp and pm10, correlation between tsp and pm10 concentrations, ratio among the two fractions and relation between tsp and pm10...