PubMed · 5259511
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B Fallentin, J Frost, A Grut. 1968. Environmental studies.. https://pubmed.ncbi.nlm.nih.gov/5259511/
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Complex formation between metMb and three heteropolytungstates, offering various sizes and charges, has been studied in the pH range 6-8. 1:1 complexes are formed with (KAs4W40O140)27- and (NaSb9W21O86)18-, with an association constant of 10(6) and 4 x 10(5) M-1 respectively, at pH 7.3 and 10 mM ionic strength. Resulting structural changes of the metMb moiety have been investigated by absorption, CD and EPR spectroscopies. Besides an acid-denatured-like form, obtained at a pH as high as 6.5 with the largest polyanion, the formation of an hemichrome is generally observed. It can be reduced to the hemochrome, whereas the complexation of deoxyMb by the polytungstates leaves the deoxy structure unaltered.
Resistance to arsenic salts in a Pseudomonas aeruginosa clinical isolate was shown to be determined by a 100 kb transferable plasmid. The resistance pattern included arsenate, arsenite, and antimonate ions. Arsenate and arsenite resistances were inducible by previous exposure of cultures to subinhibitory amounts of either of the two ions. Phosphate ions protected P. aeruginosa cells from the toxic effects of arsenate but did not alter arsenite toxicity.
In order to optimize the production of 118Te in thick targets for use in a 118Te/118Sb radionuclide generator, the excitation function for the 121Sb(p,4n)118Te reaction has been measured for 30-46 MeV protons. The excitation functions for the competing reactions natSb(p,xn)119mTe, natSb(p,xn)119Te, natSb(p,xn)121mTe, natSb(p,pxn)120mSb and 123Sb(p,pn)122Sb have also been determined using stacked foil techniques. The 121Sb(p,4n)118Te reaction cross section maximum was found to be 480 mbarn at 44 MeV. In order to minimize the 119m + 119Te interference a minimum proton beam energy of 40 MeV is required. The cross section results are compared with published data and with calculated excitation functions.