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(organic chemistry)
In stereochemistry, on the opposite side of a reference plane; for example, the stereochemical outcome of an addition reaction where the new bonds are on the opposite side of the original pi bond is called anti addition.


G-LOCclick for a larger image
Relationship between acceleration and time at maximum G required to produce symptoms of gray out and black out.
A g-induced (centrifugal acceleration) loss of consciousness. A condition that occurs when the g loading is above 5 or 6 continuously for more than 5 to 7 s. Unconsciousness follows because of the temporary stoppage of the blood supply to the brain. However, this phenomenon does not occur if the buildup of g is very rapid only momentarily, as during ejection. The chances of G-LOC can be minimized by use of anti-g suits, anti-g maneuvers, and a higher level of physical fitness. See also anti-g suits.

