Blood was withdrawn from male and from female rats, labeled with Cr51 and introduced intravenously into male and female recipients. Blood volume as determined from dilution of the isotopically labeled cells was found to be 7.47 ± 0.15 of the body weight. The half-life of the labeled cells averaged 8 days, and seemed to be unaffected by growth of the animals.
the benzene of 99.93 mole % purity that was used for calibration. The probability of any appreciable concentration of impurities being obscured by the benzene peak is, therefore, slight.The chromatograms of concentrated impurities on the poly (propylene glycol) 2025 and the benzylbiphenyl (Figure 1) columns exhibited three and one peaks, respectively, arriving before peak 1. As the total concentrations of the com-ponent^) producing these peaks are very probably appreciably less than 1 p.p.m., no attempt was made to collect and identify them. 1958.
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