[Concentration of stable zinc in human bones. Determination by x-ray fluorescence spectrography]. / Concentration de zinc stable dans les os humains. Dosage par spectrographie de fluorescence X.

Zinc has been analysed in bone samples taken from ribs and from vertebrae collected in the Paris region. X-ray fluorescence, with a detection limit of 30 ppm, has been applied to the bone ash. In the ash, the individual average concentration is 234 +/- 125 micrograms g-1 and is quite independent of age (p = 0.95 for one analysis). The vertebrae contain 14% more zinc than the ribs; the difference is significant at the 0.01 level. No difference between the sexes has been observed. An adult ingests on the average 20 mg Zn daily with his food intake. The inhaled amount is much less, approximately 9 micrograms. A skeleton contains on the average 520 mg Zn.

Long-term metabolism of [U-14C]glucose in the whole rat brain.

The experiment was performed on rats to which a single injection of [U-14C]glucose had been administered. Results were observed from the 7th to the 281st day following contamination. At 280 days only the lipids in the brain contained radioactivity, the highest degree of specific activity being found in the cerebrosides.