ABSTRACT
All planetary materials sampled thus far vary in their relative abundance of the major isotope of oxygen, (16)O, such that it has not been possible to define a primordial solar system composition. We measured the oxygen isotopic composition of solar wind captured and returned to Earth by NASA's Genesis mission. Our results demonstrate that the Sun is highly enriched in (16)O relative to the Earth, Moon, Mars, and bulk meteorites. Because the solar photosphere preserves the average isotopic composition of the solar system for elements heavier than lithium, we conclude that essentially all rocky materials in the inner solar system were enriched in (17)O and (18)O, relative to (16)O, by ~7%, probably via non-mass-dependent chemistry before accretion of the first planetesimals.
ABSTRACT
Rabbits were orally infected with Taenia pisiformis eggs and then serially killed. The development and regression of focal granulomatous lesions in the liver were observed, and these lesions were considered to be identical with the lesions in the naturally occurring disease. Focal granulomatous lesions containing onchospheres were also observed in the lungs, mesentery, and mesenteric lymph node. Thrombosis was present in some pulmonary arteries, and infarction of the lung was observed in 1 rabbit.