Decontamination of Radioactive Cesium from Sea Sludge Using Microbial Activity

2014 ◽  
Vol 617 ◽  
pp. 117-120
Author(s):  
Hirosuke Hirano ◽  
Nobuyuki Nishimiya ◽  
Yoshiyuki Kojima ◽  
Takeshi Toyama ◽  
Tetsuo Umegaki ◽  
...  
Keyword(s):  
Anaerobic Condition ◽  
Nuclear Power ◽  
Weight Ratio ◽  
Aerobic Condition ◽  
Deionized Water ◽  
Tokyo Bay ◽  
Radioactive Cesium ◽  
Cesium Nitrate ◽  
Wet Weight ◽  
Cesium Concentration

Fukushima nuclear power plant was destroyed by tsunami of the Great East Japan earthquake, and radioactive cesium was widely scattered from there. Further, highly concentrated radioactive cesium was found in the bottom of the sea sludge of Tokyo Bay, where the cesium concentration is 1.513 times as high as usual. However, the decontamination method of the bottom of the sea sludge is not yet established. Therefore, the authors proposed to decontaminate cesium from the sea sludge under an anaerobic condition, referenced from a previous study. Sludge and cesium nitrate were mixed with a wet weight ratio of 0.3 wt% for cesium nitrate to form a model mixture, and immersed in 6 dm3 of deionized water and kept for 10 days. As a result, the author found terms that is able to decrease amount of cesium in the sludge. However we found this term was not anaerobic condition from after research, finally found difficult to decreased cesium in the sludge without aerobic condition.

scholarly journals A Change in the Concentrations of Radioactive Cesium in Tokyo-bay^|^rsquo;s Sediments Released by the Fukushima Dai-ichi Nuclear Power Station Accident

2013 ◽  
Vol 62 (12) ◽  
pp. 1079-1086 ◽  
Author(s):  
Akihisa SOEMORI ◽  
Katsumi SHOZUGAWA ◽  
Norio NOGAWA ◽  
Shogo HIGAKI ◽  
Motoyuki MATSUO
Keyword(s):  
Nuclear Power Station ◽  
Nuclear Power ◽  
Tokyo Bay ◽  
Radioactive Cesium ◽  
Power Station

Oxygen concentration affects frequency and range of transconjugants for the incompatibility (Inc) P-1 and P-7 plasmids pBP136 and pCAR1

2020 ◽  
Vol 85 (4) ◽  
pp. 1005-1015
Author(s):  
Kentaro Ochi ◽  
Maho Tokuda ◽  
Kosuke Yanagiya ◽  
Chiho Suzuki-Minakuchi ◽  
Hideaki Nojiri ◽  
...  
Keyword(s):  
Oxygen Concentration ◽  
Anaerobic Condition ◽  
Environmental Samples ◽  
Aerobic Condition ◽  
Recipient Strain ◽  
Donor Strain ◽  
Anaerobic Conditions ◽  
Filter Mating ◽  
Aerobic And Anaerobic ◽  
Aerobic And Anaerobic Conditions

ABSTRACT The frequency of transconjugants were compared for the incompatibility (Inc) P-1 and P-7 plasmids pBP136 and pCAR1 under aerobic and anaerobic conditions. Filter mating assays were performed with one donor strain and one recipient strain using different donors of Pseudomonas and recipient strains, including Pseudomonas, Pantoea, and Buttiauxella. Under anaerobic condition, frequencies of transconjugants for both plasmids were 101-103-fold lower than those under aerobic condition regardless of whether aerobically or anaerobically grown donors and recipients were used. To compare the transconjugant ranges under aerobic and anaerobic conditions, conjugation was performed between the donor of pBP136 and recipient bacteria extracted from environmental samples. Several transconjugants were uniquely obtained from each aerobic or anaerobic condition. Our findings indicate that a plasmid can differently spread among bacteria depending on the oxygen concentrations of the environment.

The Relation of Oxygen Consumption to Body Size and to Temperature in the Larvae of Chironomus Riparius Meigen

1958 ◽  
Vol 35 (2) ◽  
pp. 383-395
Author(s):  
R. W. EDWARDS
Keyword(s):  
Oxygen Consumption ◽  
Body Size ◽  
Dry Matter ◽  
Larval Instar ◽  
Weight Ratio ◽  
Dry Weight ◽  
Chironomus Riparius ◽  
Consumption Rates ◽  
Rate Of Oxygen Consumption ◽  
Wet Weight

1. The oxygen consumption rates of 3rd- and 4th-instar larvae of Chironomus riparius have been measured at 10 and 20° C. using a constant-volume respirometer. 2. The oxygen consumption is approximately proportional to the 0.7 power of the dry weight: it is not proportional to the estimated surface area. 3. This relationship between oxygen consumption and dry weight is the same at 10 and at 20° C.. 4. The rate of oxygen consumption at 20° C. is greater than at 10° C. by a factor of 2.6. 5. During growth the percentage of dry matter of 4th-instar larvae increases from 10 to 16 and the specific gravity from 1.030 to 1.043. 6. The change in the dry weight/wet weight ratio during the 4 larval instar supports the theory of heterauxesis. 7. At 20° C., ‘summer’ larvae respire faster than ‘winter’ larvae.

Bathing Solution Tonicity and Potassium Transport by the Midgut of the Tobacco Hornworm Manduca Sexta

1979 ◽  
Vol 78 (1) ◽  
pp. 213-223
Author(s):  
DAVID F. MOFFETT
Keyword(s):  
Manduca Sexta ◽  
Short Circuit ◽  
Weight Ratio ◽  
Short Circuit Current ◽  
Dry Weight ◽  
Potassium Transport ◽  
Bathing Solution ◽  
Histological Studies ◽  
Wet Weight ◽  
Small Solute

Potassium transport by the isolated midgut of Manduca larvae, as measured by the short circuit current, is inhibited by substitution of small organic solutes (M.W. < 340) for the sucrose normally included in bathing solution formulated for this tissue. Other solutes of molecular weight equal to or greater than sucrose are essentially as effective as sucrose in promoting the short circuit current. Equilibration of midgut in solutions containing the small solute mannitol results in a decrease in the dry weight/wet weight ratio of the tissue, suggesting that the small solutes can penetrate into areas of the tissue which are not accessible to sucrose. Histological studies suggest that sites of swelling in the presence of mannitol include both cytoplasm and goblet cell lumen. The inhibition of the short circuit current is rapidly reversible on return to bathing solution containing sucrose or another large solute. The effect of small solutes probably does not involve compromise of the energy source for potassium transport since oxygen uptake is unchanged in the presence of a small solute.

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