English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

29 apparently influenced by the calcium content of the diet and it would appear likely that in animals maintained on a diet with fairly high calcium, such as the rats used in the present studies, this process might be only partly responsible for the preferential utilization of calcium over strontium. SUMMARY 1. The absorption of calcium, strontium, barium and radium from the gastrointestinal tract of the rat has been studied by means of double radioactive -tracer techniques. 2. At 14-18 days of age there is almost complete absorption of calcium and strontium and about 80 % of barium and radium is absorbed. For animals 6-8-weeks old absorption of calcium has decreased to about 60 %, strontium to 25 %, barium to 7 % and radium to 11 %. In animals at 60-70 weeks of age the absorption of all the elements except barium is decreased to between one-third and one-half of these levels. 3. Deprivation of food before administration markedly increases the absorption of barium and radium and slightly reduces calcium absorption. 4. Administration of the elements in cow's milk significantly enhances the absorption of calcium and, more particularly, strontium in 6-8-week-old rats. The absorption of barium and radium is not affected and the effect is not observed in old animals. 5. The results for the absorption of barium and radium show a closer similarity to each other than to the results for strontium and calcium. It has been demonstrated previously that, under suitable conditions, isolated rat-liver mitochondria can incorporate radioactive amino acids into their proteins (Reis, Coote & Work, 1959a). In a more detailed study of the system (Roodyn, Reis & Work, 1961 a) it was shown that the incorporation was not due to bacterial or microsomal contamination , was fully energy-dependent, and was very sensitive to incubation in the absence of an oxidiz-able substrate. The incorporation was not due to adsorption on the mitochondrial protein, or to the

biochemical journal

Protein synthesis in mitochondria. 2. Rate of incorporation <i>in vitro</i> of radioactive amino acids into soluble proteins in the mitochondrial fraction, including catalase, malic dehydrogenase and cytochrome <i>c</i>

Protein synthesis in mitochondria. 2. Rate of incorporation in vitro of radioactive amino acids into soluble proteins in the mitochondrial fraction, including catalase, malic dehydrogenase and cytochrome c