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21.
Laurent Jeannin Janos Sapi Elka Vassileva Pierre Renard Jean-Yves Laronze 《合成通讯》2013,43(9):1711-1719
Three methods have been proposed for the preparation of functionalized 1-oxo-1,2,3,4-tetrahydro-β-carboline-3 carboxylates (3) from which the “acylazide formation-Curtius rearrangement-acid catalyzed ring closure” sequence starling from hemi-ester hemi-acids (8) seemed to be quite general. 相似文献
22.
Arnaud Chevalier Dr. Cédrik Massif Prof. Pierre‐Yves Renard Dr. Anthony Romieu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(5):1686-1699
We describe the efficient synthesis and one‐step derivatization of novel, nonfluorescent azo dyes based on the Black Hole Quencher‐3 (BHQ‐3) scaffold. These dyes were equipped with various reactive and/or bioconjugatable groups (azido, α‐iodoacetyl, ketone, terminal alkyne, vicinal diol). The azido derivative was found to be highly reactive in the context of copper‐catalyzed azide–alkyne cycloaddition (CuAAC) reactions and allowed easy synthetic access to the first water‐soluble (sulfonated derivative) and aldehyde‐modified BHQ‐3 dyes, the direct preparation of which failed by means of conventional azo‐coupling reactions. The aldehyde‐ and α‐iodoacetyl‐containing fluorescence quenchers were readily conjugated to aminooxy‐ and cysteine‐containing peptides by the formation of a stable oxime or thioether linkage, respectively. Further fluorescent labeling of the resultant peptide conjugates with red‐ or far‐red‐emitting rhodamine or cyanine dyes through sequential and/or one‐pot bioconjugations, led to novel Förster resonance energy transfer (FRET) based probes suitable for the in vivo detection and imaging of urokinase plasminogen activator, a key protease in cancer invasion and metastasis. 相似文献
23.
We prove the vanishing of the (possibly twisted) orbital integrals of certain functions on real Lie groups at non-semisimple elliptic elements. This applies to Euler–Poincaré functions and makes some results of [7] (Chenevier and Clozel, 2009) unconditional. 相似文献
24.
We present experimental evidence that pressure solution creep does not establish a steady-state interface microstructure as previously thought. Conversely, pressure solution controlled strain and the characteristic length scale of interface microstructures grow as the cubic root of time. Transient creep with the same scaling is known in metallurgy (Andrade creep). The apparent universal scaling of pressure solution transient creep is explained using an analogy with spinodal dewetting. 相似文献
25.
Vayron P Renard PY Valleix A Mioskowski C 《Chemistry (Weinheim an der Bergstrasse, Germany)》2000,6(6):1050-1063
In a new approach to the safe neutralization of organophosphorus chemical weapons, we designed a hapten to elicit catalytic antibodies with phosphatase activity. Here we report the synthesis of this alpha,alpha-difluorophosphinate hapten 6. Various methods for the introduction of the key alpha,alpha-difluoromethyl feature into the phosphinate hapten are discussed. The best results were obtained with the electrophilic gem-difluorinating agent N-fluorobenzenesulfonimide. 相似文献
26.
Quasielastic neutron scattering experiments on TMNB show for T > 2.8 K a diffraction pattern characteristic for a 1-D ferromagnet with an exchange energy along the chain J/kB ? 10 K. For T < TN =2.7 K the 3-D magnetic ordering was found to be of a simple antiferromagnetic type. A lattice distortion was observed as well below 200 K. 相似文献
27.
P. Chiappetta F. M. Renard C. Verzegnassi 《Zeitschrift fur Physik C Particles and Fields》1996,71(1):673-677
We consider the virtual signals of aZ′ of very general type in the processe + e ?→W + W ? at a future linear collider (NLC). We show that possible deviations from the SM predictions in this channel are related to similar deviations in the purely leptonic one in a way that is only characteristic of thisZ′ model, and not in general of possible competitor models with anomalous gauge couplings. 相似文献
28.
The critical exponents β, γ, δ and the scaling function of ferromagnetic Cu(NH4)2Br4, 2H2O and CuRb2Br4, 2H2O have been determined. The experimental scaling function is close to the theoretical one of three-dimensional Heisenberg model and the scaling laws are approximately fullfilled. The measured susceptibilities agree well with theoretical results for slightly anisotropic Heisenberg ferromagnet. The predicted cross-over effect, well observed on the perpendicular susceptibility, allows to explain the low experimental value of γ. 相似文献
29.
We remark that the high energy gauge boson scattering processes involving two-body initial and final states satisfy certain selection rules described as helicity conservation of the gauge boson amplitudes (GBHC). These rules are valid at the Born level, as well as at the level of the leading and subleading 1-loop logarithmic corrections, in both the standard model and the minimal supersymmetric standard model (MSSM). A "fermionic equivalence" theorem is also proved, which suggests that GBHC is valid at all orders in the MSSM at sufficiently high energies, where the mass suppressed contributions are neglected. 相似文献
30.