Shewanella algae

Workman SL Woods, YA Gorby, JK Fredrickson, and MJ Trnex (1997) Microbial reduction of vitamin B,2 by Shewanella alga strain BrY with snbseqnent transformation of carbon tetrachloride. Environ Sci Technol 31 2292-2297. 

Caccavo F, Schamberger PC, Keiding K, Nielsen PH (1997) Role of hydrophobicity in adhesion of the dissimilatory Fe(III)-reducing bacterium Shewanella alga to amorphous Fe(lll) oxide. App Environ Microbio 63 3837-3843... 

Parmar N, Warren LA, Roden EE, Eerris EG (2000) Solid phase capture of strontium by the iron reducing bacteria Shewanella alga strain BrY. Chem Geol 169 281-288 Pearson MJ (1974) Sideritic concretions from the Westphalian of Yorkshire a chemical investigation of the carbonate phase. Min Mag 39 696-699... 

That the reduction takes place at the surface, receives support from an experiment in which the extent of reduction of various Fe oxides by Shewanella alga after 30 days was linearly correlated with the SAbet the exception was 2-line ferrihydrite for which a surface area of 600 m /g had to be assumed in order to fit the relationship (Roden Zachara, 1996). Although experimental (BET) surface areas of ferrihydrite are substantially lower than 600 m /g, calculated values based on particle size as well as those determined from ligand adsorption experiments (see Table 5.1) are in this range. Dissolved Fe was found to create a lag phase in the reduction process (in contrast to the behaviour in inorganic systems) because Fe is adsorbed at the cell surface (Liu et al. 2001). This effect can be overcome by complexing the Fe (e. g. 

Cumming, D.E., Caccavo, F., Jr., Fendorf, S. and Rosenzweig, R.F. (1999) Arsenic mobilization by the dissimilatory Fe(III)-reducing bacterium Shewanella alga BrY. Environmental Science and Technology, 33(5), 723-29. 

Vinogradov, E., Korenevsky, A., Beveridge, TJ. The structure of the core region of the lipopolysaccharide from Shewanella algae BrY, containing 8-amino-3,8-dideoxy-D-manno-oct-2-ulosonic acid. Carbohydr Res 339 (2004) 737-740. 

Arsenic can also be released indirectly as a result of other microbially induced redox reactions. For example, the dissimilatory iron-reducing bacterium Shewanella alga (strain BrY) reduces Fe(III) to Fe(II) in FeAs04-2H20,... 

Arsenic mobihzation by the dissimilatory Fe(III)-reducing bacterium Shewanella alga BrY. Environ. Set Technol. 33, 723-729. 

Iron(III)-reducing microbes can lead to increased mobility of many metals by reducing Fe oxides to which metals are bound. For example, Cummings et al. (1999) showed that Fe(III) reduction by the FeRB Shewanella alga mobilized arsenate [As(V)] that was bound to the iron oxides. Thus, seasonal cycles in... 

An additional aspect of these dehalogenations that elucidates the role of vitamin B12 is provided by experiments with Shewanella alga strain BrY (Workman et al. 1997). This organism carries out reduction of Fe(III) and Co(III) during growth with lactate and H2, and was used to reduce vitamin B12a anaerobically in the presence of an electron donor. The biologically reduced vitamin B12 was then able to transform tetrachloromethane to CO. 

Konishi, Y, Ohno, K., Saitoh, N., Nomura, T., Nagamine, S., Hishida, H., Takahashi, Y, and Uruga, T., Bioreductive deposition of platinum nanoparticles on the bacterium Shewanella algae, J. Biotechnol, 128, 648-653, 2007. 

Figure 8 Schematic representation of three possible microbial mechanisms for mobilization of arsenic oxyanions adsorbed to ferrihydrite surfaces by respiratory reduction. Bottom left Shewanella alga reduces Fe(lll) to Fe(It), thereby releasing As(V) into solution (41). Lower right bacterially reduced electron shuttle molecules pass electrons to solid-phase As(V) and Fe(III) (48). Top Sulfiirospirillum bamesii directly reduces both As(V) and Fe(III) (43).

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