Characterization of cesium uptake mediated by a potassium transport system of bacteria in a soil conditioner.
We found that bacteria in a commercial soil conditioner sold in Ishinomaki, Miyagi, exhibited concentrative and saturable cesium ion (Cs(+)) uptake in the natural range of pH and temperature. The concentration of intracellular Cs(+) could be condensed at least a few times higher compared with the outside medium of the cells. This uptake appeared to be mediated by a K(+) transport system, since Cs(+) uptake was dose-dependently inhibited by potassium ion (K(+)). Eadie-Hofstee plot analysis indicated that the Cs(+) uptake involved a single saturable process. The maximum uptake amount (Jmax) was the same in the presence and absence of K(+), suggesting that Cs(+) and K(+) uptakes were competitive with respect to each other. These bacteria might be useful for bioremediation of cesium-contaminated soil.
Faculty of Pharmacy, Takasaki University of Health and Welfare.
Pengyao
P
Zhang
Yoko
Y
Idota
Kentaro
K
Yano
Masayuki
M
Negishi
Hideaki
H
Kawabata
Hiroshi
H
Arakawa
Kaori
K
Morimoto
Akira
A
Tsuji
Takuo
T
Ogihara
D001419:Bacteria / Q000378:metabolism*; D001692:Biological Transport / Q000187:drug effects; D002586:Cesium / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D006863:Hydrogen-Ion Concentration; D011188:Potassium / Q000378:metabolism* / Q000494:pharmacology; D012989:Soil Pollutants / Q000378:metabolism*; D013696:Temperature; D013997:Time Factors
D012989:Soil Pollutants; D002586:Cesium; D011188:Potassium