SOME OBSERVATIONS ON ABSORPTION OF CESIUM BY EXCISED BARLEY ROOTS
Steady-state cesium absorption was studied in relation to the external cesium concentration and under conditions of low temperature and anoxybiosis. The results are tentatively explained on the basis of a two-fold absorption mechanism. The first mechanism is very effcctive, reachin g a saturation level at a concentration as low as 0.1 meq/l (half-value F Screening tes 0.008 meq/l). Absorption at this concentration was shown to be sensitive to anoxybiosis. The second mechanism becomes relatively important only at concentrations a hundred- fold higher and is insensitive to anoxybiosis. The possibility of a passive nature of the second mechsnism is discussed. The interference by other mono- and divalent cations with cesium absorption in the concentration range from 0.0 to 0.1 meq/l was studied. Potassium, rubidium, and to a lesser extent, NH/sub 4/ inhibited cesium uptake in a way suggesting competition for the same binding site. Lithium and magnesium had little effect on cesium absorption; sodium and calcium only affected tho over-all absorption capacity for cesium; sodium in a negative sense and calcium in a positive sense. (auth)
- Research Organization:
- Univ. of California, Berkeley
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-023864
- OSTI ID:
- 4145903
- Journal Information:
- Plant Physiology (U.S.), Journal Name: Plant Physiology (U.S.) Vol. Vol: 35; ISSN PLPHA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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