Proximal mechanisms involved

Table VIII. Proximal Mechanisms Involved in Carcinogenic Interactions of Pesticides...

Despite the work presented, no definitive mechanism for the homogeneous hydrogenation of olefins with triarylphosphinerhodium(I) halide catalysts is postulated here. However the experimental observations of inhibition by excess hydrogen and possibly excess olefin are inconsistent with the previously postulated mechanisms (2, 3) involving monometallic active species. The analysis presented suggests that a mechanism involving bimetallic intermediates with the metal sites in reasonable proximity can account for all presently available experimental observations. 

The first mechanism involves the glomerular filtration of larger, complex peptides and proteins, followed by reabsorption into endocytic vesicles in the proximal tubule and subsequent hydrolysis into small peptide fragments and amino acids [76]. This mechanism of elimination has been described for IL-2 [77], IL-11 [78], growth hormone [79], and insulin [80]. 

Apparemly, (he proximity of the cabinet door provided the path lor interaction between the two circuits, resulting in recurring computer error. The exact mechanism involved is not known, but it is similar in some respects to imiltiple-groimded circuits that exhibit interactions because of the grounds. Such grounds can accidentally l e applied to sensitive circuitry through the third wire in a three-wire power cord to test instruments or through the shield of a shielded cable, to name just two. The point to note is that extreme care should be... 

Recent studies at the Iron Mountain acid mine-drainage site in California suggest that the main role of A. ferrooxidans is to oxidize iron downstream from the principal acid-generating site, and that the primary effect is to enhance the precipitation of iron oxyhydroxides (Banfield and Welch, 2000). Other iron-oxidizing bacteria (e.g., L. ferrooxidans) and archeal (e.g., Thermoplasmales) species have been observed proximal to the sulfide ore (Edwards et al., 2000). The utilization of energy derived from iron or sulfur oxidation in other prokaryotes remains unclear, but it can be surmised that the mechanism involved could be broadly similar to that determined for A. ferrooxidans (Banfield and Welch, 2000). 

The Purcell s original idea [10] on modification of photon spontaneous emission rate is extended to modification of photon spontaneous scattering rate. Simultaneous account for local incident field and local density of photon states enhancements in close proximity to a silver nanoparticle is found to provide up to lO -fold Raman scattering cross-section rise up. Thus, single molecule Raman detection is found to be explained by consistent quantum electrodynamic description without chemical mechanisms involved. 

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