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The abundance of N(15) relative to N(14) is significantly altered during experiments in vitro in which nitrate and nitrite are microbiologically reduced to nitrogen gas. In all studies to date, N(14)O(3)-and N(14)O(2)-species have been preferentially reduced. This selectivity has a complex dependence on conditions in the medium. The results are not only(More)
In the past several years, there has been considerable progress made on a general leftde…nite theory associated with a self-adjoint operator A that is bounded below in a Hilbert space H; the term ‘left-de…nite’has its origins in di¤erential equations but Littlejohn and Wellman [25] generalized the main ideas to a general abstract setting. In particular, it(More)
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