Atherosclerosis in the carotid arteries, two large arteries in the neck that carry blood to the brain, is a major risk factor for ischemic stroke. Symptoms of stroke include: 1  Sudden numbness, weakness, or paralysis of face, arm or leg, especially on one side of the body. carotid endarterectomy is a surgical procedure in which a doctor removes fatty deposits blocking one of the two carotid arteries, the main supply of blood for the brain.
Polar stratospheric cloud. Polar stratospheric clouds or PSCs, also known as nacreous clouds (/ËneÉªkriË.És/, from nacre, or mother of pearl, due to its iridescence), are clouds in the winter polar stratosphere at altitudes of 15,000â25,000 meters (49,000â82,000 ft).
Found at very low levels (less than 2000 meters, or 6500 feet), stratus clouds are thick, large, heavy-looking gray clouds that dominate the sky. Precipitation normally does not occur with this cloud, although drizzle or mist may be observed. This type of cloud resembles fog, and occasionally when fog lifts, it will form a stratus cloud deck. Latin Derivative: stratus - layer http://www.msstate.edu: Nimbostratus (Ns) Nimbostratus clouds are also found below 2000 meters. They are usually a darker color of gray than stratus clouds because of their high moisture content - precipitation usually occurs with this cloud type. The base of this cloud can be difficult to identify and it may stretch high into the atmosphere.