in the x direction, the water wants to flow in that direction) For a given hydraulic. conductivity, the vertical flow rate depends on the sum of the gravitational potential energy. gradient per unit weight of water (dz/dz =1) and the vertical gradient in soil water pressure.
Origin and spread of the 1278insTATC mutation causing TayâSachs disease in Ashkenazi Jews: Genetic drift as a robust and parsimonious hypothesis. Human Genetics 114 (4): 366â376. pmid 14727180.
Tay-Sachs is a disease of the central nervous system; it is a neurodegenerative disorder. Tay-Sachs most commonly affects infants. In infants, it is a progressive disease that is unfortunately always fatal. Rarely, Tay-Sachs can occur in teens and adults, causing less severe symptoms.hose with the chronic form of Tay-Sachs develop symptoms by the age of 10, but the disease progresses slowly. Symptoms may include slurred speech, muscle cramps, and tremors. Life expectancy varies with this form of the disease, and some individuals have a normal lifespan.