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At least 73 records · Page 4Linked to original sources
PubMed1974

Translocation of Radioactive Carbon after the Application of C-Alanine and CO(2) to Sunflower Leaves.

(14)C-(UL)-l-Alanine was applied to the surface of mature leaves at the second node of sunflower (Helianthus annuus L. cv Commander) plants, under illumination. The alanine was absorbed during a 4-hour period, and some of it was metabolized by the absorbing tissue. After a lag period of about 15 minutes from first application, distribution of (14)C through the plant proceeded in much the same pattern as when (14)CO(2) is assimilated by similar leaves. Most, if not all, of the (14)C exported from the absorbing regions was in sucrose. Only minute amounts appeared in alanine or other amino acids in surrounding parts of the leaf blade or in the petiole, although these were strongly labeled in the tissue absorbing (14)C-alanine.When (14)CO(2) was supplied for 15 minutes to leaves of different ages, amino acids were lightly labeled in the leaf blade. Mature green leaves exported only sucrose. Yellowing leaves on 60-day-old plants exported a variety of substances including amino acids.

Journal Article↗
PubMed1979

[Rapid determination of antibiotics resistance in clinico-surgical practice on the basis of radioactive carbon dioxide measurements].

The radiometric method is founded on the measurement of the 14CO2 which has gone free. This method was worked out of our team. It is a prompt sensitive and quantitative procedure for the control of antibiotic effect on bacteria. The method is a support in critical clinical situations. The prompt establishment of the antibiotic sensitivity can be live-saving. The empirics descended from 312 surgical patients. The antibiotical sensitivity of secretion samples is to be obtained within 4-6 hours. The results show in comparison with the classic bacteriological examinations five per cent less deviation. At the same time the computer analysis enables a finer distinction. 22 variable findings are possible within the categories: sensible, middling sensible and resistant. In that way the tested antibiotics are classified in an order of rank. The apparatus for the examination is producible without particular expenses. The measurements can be carried out at each hospital or clinical laboratory.

Anti-Bacterial Agents↗