763 research outputs found
The allosteric protein interactions in the proton-motive function of mammalian redox enzymes of the respiratory chain
Insight into mammalian respiratory complexes defines the role of allosteric protein interactions in their proton-motive activity. In cytochrome c oxidase (CxIV) conformational change of subunit I, caused by O2 binding to heme a32+-CuB+ and reduction, and stereochemical transitions coupled to oxidation/reduction of heme a and CuA, combined with electrostatic effects, determine the proton pumping activity. In ubiquinone-cytochrome c oxidoreductase (CxIII) conformational movement of Fe-S protein between cytochromes b and c1 is the key element of the proton-motive activity. In NADH-ubiquinone oxidoreductase (CxI) ubiquinone binding and reduction result in conformational changes of subunits in the quinone reaction structure which initiate proton pumping
Mueller-Navelet jets in next-to-leading order BFKL: theory versus experiment
We study, within QCD collinear factorization and including BFKL resummation
at the next-to-leading order, the production of Mueller-Navelet jets at LHC
with center-of-mass energy of 7 TeV. The adopted jet vertices are calculated in
the approximation of small aperture of the jet cone in the
pseudorapidity-azimuthal angle plane. We consider several representations of
the dijet cross section, differing only beyond the next-to-leading order, to
calculate a few observables related with this process. We use various methods
of optimization to fix the energy scales entering the perturbative calculation
and compare thereafter our results with the experimental data from the CMS
collaboration.Comment: 20 pages, 11 figures. Misprints removed in Tables 7 and 8 and in one
place of the text; figures and conclusions unchanged; version which
incorporates the Erratum accepted by Eur. Phys. J.
An accessibility planning tool for network transit oriented development: SNAP
In the academic debate regarding the influences between urban form, built environment and travel patterns, a specific idea that has taken hold is that more compact urban development around railway stations, often referred to as Transit Oriented Development (TOD), contributes to the control of vehicle travel and to more sustainable metropolitan systems. According to this general principle this work proposes a GIS accessibility tool for the design of polycentric transit oriented scenario: SNAP - Station Network Accessibility Planning tool. In the first part the state of the art on Transit Oriented Development policies in Europe is presented with a focus on three study cases. In the second part the SNAP tool is described, with remarks to the approach, the methodology and the used indicators. Furthermore the paper discusses an application to the metropolitan area of Naples
Semihard processes with BLM renormalization scale setting
We apply the BLM scale setting procedure directly to amplitudes (cross
sections) of several semihard processes. It is shown that, due to the presence
of -terms in the NLA results for the impact factors, the obtained
optimal renormalization scale is not universal, but depends both on the energy
and on the process in question. We illustrate this general conclusion
considering the following semihard processes: (i) inclusive production of two
forward high- jets separated by large interval in rapidity
(Mueller-Navelet jets); (ii) high-energy behavior of the total cross section
for highly virtual photons; (iii) forward amplitude of the production of two
light vector mesons in the collision of two virtual photons.Comment: 4 pages, one figure; presented by B. Murdaca at "Diffraction 2014",
International Workshop on Diffraction in High-Energy Physics, Primosten
(Croatia), Sept. 10-16, 2014; to be published in the conference proceedings
by AI
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