Transition metals distribution maps

Other recent preliminary studies have demonstrated the utility of X-ray microprobes to interrogate the distribution and chemical speciation of transition metals and other elements in single cells of Pseudomonas fluorescens adhered to Kapton film and the DMRB, Shewanella putrefaciens adhered to an iron oxide film (Kemner et al. 2001). While preliminary, this study demonstrates the utility of synchrotron X-ray microprobes to examine single fully hydrated bacterial cells. The Ca K map of P. fluorecens adhered to Kapton film can be used to define the location of the bacterium cell on the Kapton. The Cr Ka map of the same bacterium exposed to a Cr(VI) solution demonstrates a different distribution than the Ca, indicating that the Cr is not concentrated within the cell (Fig. 13). 

Turning to non-transition-metal catalysis, transition-state structures for the reduction of 2-methyl- and 2-isopropyl-cyclohexanone by LAH have been identified by DFT, and LUMO maps and NBO analysis have been used to examine the uneven distribution of the molecular orbital about the carbonyl r-plane, in order to explain the product ratio " substituent effects, the conformational ratio in the reactant, and... 

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