Abstract
Summary
Two species of Muridae neonata are more resistant to the lung edema produced by inhalation of nitrogen dioxide and to the lung edema produced by intraperitoneal injections of thiourea than comparable weight-adjusted adults. These results are in direct contrast to both original data and data from the literature on the ordinarily increased sensitivity of neonata to most drugs and toxic agents. The normal lung-body weight percentage in rats decreases from 1.7% at birth to 0.5% at 90 days.
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