Although research linking cardiovascular disorders to geomagnetic activity during the past 40 years is accumulating, robust evidence for the effect of geomagnetic activity (the earth’s magnetic field) on stroke occurrence is lacking and remains a matter of controversy. This is because most studies to date are complicated by significant methodological limitations: high likelihood of stroke miscl...

Induction vectors represent geomagnetic transfer functions used in magnetotellurics and related passive electromagnetic sounding methods geophysics. They are obtained from the measurements of variation carry information on distribution local regional electric resistivity subsurface, which can be interpreted terms geology tectonics. The underlying concept their interpretation works properly if s...

nifedipine (nif) a 1, 4-dihydropyridine calcium channel antagonist, undergoes photodegradation to nitroso analogues of dehydronifedipine (ndnif) when exposed to sunlight. photodegradation products of nif have no clinical activity, so different formulations of nif must remain unchanged. if nif preparations become unstable in exposure to light, they could cause therapeutic failure. the present st...