Document Detail

Radiotolerance of phosphatases of a Serratia sp.: Potential for the use of this organism in the biomineralization of wastes containing radionuclides.
MedLine Citation:
PMID:  22422344     Owner:  NLM     Status:  Publisher    
Aqueous wastes from nuclear fuel reprocessing present special problems of radiotoxicity of the active species. Cells of Serratia sp. were found previously to accumulate high levels of hydrogen uranyl phosphate (HUP) via the activity of a phosphatase enzyme. Uranium is of relatively low radiotoxicity whereas radionuclide fission products such as (90) Sr and (137) Cs are highly radiotoxic. These radionuclides can be co-crystallized, held within the bio-HUP "host" lattice on the bacterial cells and thereby removed from contaminated solution, depending on continued phosphatase activity. Radiostability tests using a commercial (60) Co γ-source showed that while cell viability and activity of purified phosphatase were lost within a few hours on irradiation, whole-cell phosphatase retained 80% of the initial activity, even after loss of cell culturability, which was increased to 100% by the incorporation of mercaptoethanol as an example radioprotectant, beyond an accumulated dose of >1.3 MGy. Using this co-crystallization approach (without mercaptoethanol) (137) Cs(+) and (85) Sr(2+) were removed from a simulated waste selectively against a 33-fold excess of Na(+) . Biotechnol. Bioeng. © 2012 Wiley Periodicals, Inc.
M Paterson-Beedle; B C Jeong; C H Lee; K Y Jee; W H Kim; J C Renshaw; L E Macaskie
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-2-14
Journal Detail:
Title:  Biotechnology and bioengineering     Volume:  -     ISSN:  1097-0290     ISO Abbreviation:  -     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-3-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7502021     Medline TA:  Biotechnol Bioeng     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Wiley Periodicals, Inc.
School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK; telephone: 44-121-4145889; fax: 44-121-4145925.
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