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71.
Fabrice Melnyk 《Comptes Rendus Mathematique》2002,335(7):643-648
We consider the gravitational collapse of the charged star leading to a black-hole. We prove that a fixed observer in Schwarzschild variables observes, at the last moments of the collapse in his own proper time, an outgoing thermal flux of spin 1/2 particles containing preferentially the particles with the same charge that the black-hole. This is the Hawking effect. To cite this article: F. Melnyk, C. R. Acad. Sci. Paris, Ser. I 335 (2002) 643–648. 相似文献
72.
MR Eskildsen AB Abrahamsen PL Gammel DJ Bishop NH Andersen K Mortensen PC Canfield 《Pramana》2002,58(5-6):903-905
We compare the results of small angle neutron scattering on the flux line lattice (FLL) obtained in the borocarbide superconductor
LuNi2B2C with the applied field along the c- and a-axes. For H‖c the temperature dependence of the FLL structural phase transition from square to hexagonal symmetry was investigated. Above
10 K the transition onset field. H
2(T), rises sharply, bending away from H
c2(T) in contradiction to theoretical predictions of the two merging. For H‖a a first order FLL reorientation transition is observed at H
tr=3–3.5 kOe. Below H
tr the FLL nearest neighbor direction is parallel to the b-axis, and above H
tr to the c-axis. This transition cannot be explained using nonlocal corrections to the London model. 相似文献
73.
NMR studies revealed that methyl phenylacetate enolate generated with the P4-tBu phosphazene base was ‘naked’ or tightly associated with P4-tBuH+ cation depending on very small variations in solvent composition. Both forms reacted more rapidly than the corresponding lithium enolate in a model alkylation experiment using dimethyl sulfate. 相似文献
74.
The addition of ~ 0.6 at.% iodine to approximately stoichiometric a-As2Se3 enhances the hole drift velocity by more than a decade but does not affect its field, thickness and temperature dependence or the degree of disorder. It is speculated that iodine reduces the ratio of trapping to hopping states in the trap-controlled hopping process which recently has been proposed for a-As2Se3. 相似文献
75.
Olivier C Perzyna A Coffinier Y Grandidier B Stiévenard D Melnyk O Durand JO 《Langmuir : the ACS journal of surfaces and colloids》2006,22(16):7059-7065
While fluorescent-based methods are generally used to detect the immobilization and the interactions of biomolecules to solid supports, recent studies have shown their limitations in the case of silicon surfaces. As an alternative, we investigated the synthesis of peptides labeled with a metal transition complex and their subsequent immobilization to the silicon surfaces. The feasibility of using such probes has been explored by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). By starting with hydrogen-terminated or oxidized silicon surfaces, we functionalized those surfaces with semicarbazide groups and showed the site-specific linkage of glyoxylyl peptides labeled with a Co2(CO)6 moiety. 相似文献
76.
77.
Tartric acid-based linker for the solid-phase synthesis of C-terminal peptide alpha-oxo aldehydes 总被引:1,自引:0,他引:1
Melnyk O Fruchart JS Grandjean C Gras-Masse H 《The Journal of organic chemistry》2001,66(12):4153-4160
A novel linker, based on the anchoring of (+)-dimethyl 2,3-O-isopropylidene-D-tartrate to PEGA or PEG-PS solid supports, was developed for the solid-phase synthesis of C-terminal peptide alpha-oxo aldehydes. Peptide elongation was performed using the 9-fluorenylmethoxycarbonyl/t-Bu chemistry. The peptide and the 1,2-diol were deprotected on the solid phase. Then, a periodic oxidation of the fully deprotected peptidyl-resin led to the simultaneous cleavage of the product from the solid support and to the generation of the alpha-oxo aldehyde moiety. The methodology allowed the distance between the alpha-oxo aldehyde and the peptide to be easily modulated. The C-terminal peptide alpha-oxo aldehydes synthesized in this study were found to be useful partners in hydrazone, thiazolidine, and oxime chemical ligations. 相似文献
78.
Yuriy L. Zub Inna V. Melnyk Nataliya V. Stolyarchuk Halyna I. Dobryanska Mariusz Barczak Andrzej Dabrowski 《Progress in Solid State Chemistry》2005,33(2-4):179-186
The structure and texture characteristics of the hybrid organic–inorganic adsorbents, which were obtained by using of two-component systems of “structure-forming agent/trifunctional silane”, are compared as follows: the first component is Si(OC2H5)4 or (C2H5O)3Si–A–Si(OC2H5)3, where A = –(CH2)2– or –C6H4–; the second one is alkoxysilane with amine (–NH2, NH, –NH(CH2)2NH2) and thiol (–SH) groups. The adsorbents, derived from TEOS, have more accessible functional groups (2.6–4.2 mmol/g) than xerogels, which are based on bis(triethoxysilanes) (1.0–2.6 mmol/g). On another hand xerogels derived from bis(triethoxysilanes) have a more extended porous structure (Ssp =516–968 m2/g, Vs = 0.418–1.490 cm3/g, d = 2.5–15.0 nm) than those that are based on TEOS (Ssp = 4–631 m2/g, Vs = 0.005–1.382 cm3/g, d = 2.3–17.7 nm). The geometric dimensions of functional groups have a more essential effect on the parameters of porous structure in the case of TEOS-derived xerogels. Using solid-state NMR spectroscopy, it has been shown that in synthesis of xerogels with the use of TEOS, the molecular frame of globules is formed by structural units Qn (n = 2,3,4), and the functional groups exist as structural units of Tn (n = 2,3). The xerogels obtained with using bis(triethoxysilanes) consist only of structural units of Tn-type (n = 1,2,3). 相似文献
79.
Chenevier P Grandjean C Loing E Malingue F Angyalosi G Gras-Masse H Roux D Melnyk O Bourel-Bonnet L 《Chemical communications (Cambridge, England)》2002,(20):2446-2447
A practical preparation of onion vesicles targeted to dendritic cells involves the grafting of mannose-mimetic clusters, bearing a hydrazino group, onto the surface of onion vesicles containing an aldehyde functionalized lipid. 相似文献
80.