984 research outputs found
The MC@NLO 4.0 Event Generator
This is the user's manual of MC@NLO 4.0. This package is a practical
implementation, based upon the Fortran HERWIG and Herwig++ event generators, of
the MC@NLO formalism, which allows one to incorporate NLO QCD matrix elements
consistently into a parton shower framework. Processes available in this
version include the hadroproduction of single vector and Higgs bosons, vector
boson pairs, heavy quark pairs, single top, single top in association with a W,
single top in association with a charged Higgs in type I or II 2HDM models,
lepton pairs, and Higgs bosons in association with a W or Z. Spin correlations
are included for all processes except ZZ production. This document is
self-contained, but we emphasise the main differences with respect to previous
versions.Comment: 36 pages, no figure
Probing the reactivity of a 2,2′-bipyridyl-3,3′-bis-imine ligand by X-ray crystallography
The reactivity of a Schiff-base bis-imine ligand 3 is probed by X-ray diffraction studies. Its susceptibility to hydrolysis, oxidation and nucleophilic addition reactions is demonstrated by the isolation of the methanol adduct 4 and two diazapene heterocycles 5 and 6. This reactivity is also reflected in the molecular structures of two coordination complexes isolated by the reaction of 3 with MIJhfac)2 salts, to afford [Cu(5)-(hfac)(tfa)] (8) and [Zn(6)(hfac)2] (9)
Cables1 links Slit/Robo and Wnt/Frizzled signaling in commissural axon guidance
During neural circuit formation, axons navigate from one intermediate target to the next, until they reach their final target. At intermediate targets, axons switch from being attracted to being repelled by changing the guidance receptors on the growth cone surface. For smooth navigation of the intermediate target and the continuation of their journey, the switch in receptor expression has to be orchestrated in a precisely timed manner. As an alternative to changes in expression, receptor function could be regulated by phosphorylation of receptors or components of signaling pathways. We identified Cables1 as a linker between floor-plate exit of commissural axons, regulated by Slit/Robo signaling, and the rostral turn of post-crossing axons, regulated by Wnt/Frizzled signaling. Cables1 localizes β-catenin, phosphorylated at tyrosine 489 by Abelson kinase, to the distal axon, which in turn is necessary for the correct navigation of post-crossing commissural axons in the developing chicken spinal cord
trans-Bis(dimethyl sulfoxide-κO)bis(thiosemicarbazide-κ2 N 1,S)cadmium dipicrate dihydrate
In the cation of the title compound, [Cd(CH5N3S)2(C2H6OS)2](C6H2N3O7)2·2H2O, the CdII atom is located on an inversion center. It is hexacoordinated in an octahedral fashion by two thiosemicarbazide molecules, which coordinate in a bidentate manner via the S and N atoms, and to the O atom of two dimethyl sufoxide (DMSO) molecules. The charges are equilibrated by two picrate anions and the complex crystallizes as a dihydrate. In the crystal, these units are linked by a number of O—H⋯O and N—H⋯S hydrogen bonds and weak C—H⋯O interactions, forming a three-dimensional network
(Dimethyl sulfoxide-κO)bis(thiosemicarbazide-κ2 N 1,S)zinc dipicrate dimethyl sulfoxide solvate monohydrate
The title complex, [Zn(CH5N3S)2(C2H6OS)](C6H2N3O7)2·C2H6OS·H2O, is composed of a [Zn(thiosemicarbazide)2(DMSO)]2+ cation (where DMSO is dimethyl sulfoxide), and two picrate anions. In the asymmetric unit, there is also a solvent molecule of DMSO and a water molecule of crystallization. In the cation, the ZnII atom is five-coordinated in a distorted square–pyramidal geometry. It coordinates to the O atom of a DMSO molecule and to the S and one N atom of two thiosemicarbazide molecules, which behave as bidentate ligands coordinating in a trans arrangement. In the crystal, a number of N—H⋯O, O—H⋯O and N—H⋯S hydrogen bonds link the molecules into two-dimensional networks. These networks are further linked via weak C—H⋯O interactions, forming a three-dimensional arrangement. Positional disorder in one methyl group of the coordinated DMSO molecule and in the two picrate anions was observed
Correlation between capacitances of porous carbons in acidic and aprotic EDLC electrolytes
5 pages, 4 figures, 2 tables.-- Printed version published Jun 2007.A study based on a total of 41 nanoporous carbons shows that there exists a good correlation between the limiting gravimetric capacitances Co at low current densities j (1 mA cm−2) measured in aprotic (1 M (C2H5)4 NBF4 in acetonitrile) and in acidic (2 M aqueous H2SO4) electrolytes. The comparison of the surface-related capacitances (F m−2) of well characterized samples with the amount of thermodesorbed CO suggests a strong contribution of CO generating surface groups to charge storage in the acidic electrolyte, but a negligible contribution in the aprotic medium. It also appears that the decrease of the capacitance with current density is similar in both electrolytes. This confirms that the average micropore width and the CO2 generating surface groups are the main factors which limit the ionic mobility in both electrolytes.Peer reviewe
Diiodidobis(triphenylphosphine oxide)cadmium
In the title compound, [CdI2{(C6H5)3PO}2], the CdII atom is ligated by two I atoms and two O atoms from two triphenylphosphine oxide ligands in a disorted tetrahedral arrangement. While the O—Cd—I angles vary from 106.67 (7) to 111.23 (7)°, the O—Cd—O angle is 88.60 (10)° and the I—Cd—I angle angle is 125.47 (2)°. The crystal structure is stabilized by van der Waals forces only
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