Transcranial Doppler Assessment of Cerebral Flow Velocity During Cognitive Tasks Roger E. Kelley, MD; Jen Y. Chang, MS; Nancy J. Scheinman, PhD; Bonnie E. Levin, PhD; Robert C. Duncan, PhD; and Shih-Chang Lee, PhD Background and Purpose: The purpose of this study was to assess the ability of transcranial Doppler ultrasonography to detect selective circulatory changes during cognitive activity. Methods: We measured cerebral artery flow velocity in 21 normal volunteers by transcranial Doppler ultrasonography during rest followed by cerebral activation. Mean and peak systolic
Neptune has dark storms and eight named moons, although there are more than 8 moons. Source(s): My memory http://burro.astr.cwru.edu/stu/neptune_m...
A storm is a violent disturbance, and most references to storms have to do with weather effects dominated by strong winds. The main types include the hailstorm, ice storm, rainstorm, snowstorm, thunderstorm, windstorm, cyclone, hurricane, and tornado. The first six types refer to violent winds accompanied by another feature. A hailstorm is weather system accompanied by a fall of hailstones, ice pellets that are larger than 0.2 inches (5 millimeters) in diameter. Even though ice is involved in both, an ice storm is different.