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排序方式: 共有96条查询结果,搜索用时 15 毫秒
1.
Daniel Caurant Odile Majérus Edward Fadel Marion Lenoir Christel Gervais Olivier Pinet 《Journal of the American Ceramic Society》2007,90(3):774-783
Crystallization of the poorly durable Na2 MoO4 phase able to incorporate radioactive cesium must be avoided in SiO2 –Al2 O3 –B2 O3 –Na2 O–CaO glasses developed for the immobilization of Mo-rich nuclear wastes. Increasing amounts of B2 O3 and MoO3 were added to a SiO2 –Na2 O–CaO glass, and crystallization tendency was studied. Na2 MoO4 crystallization tendency decreased with the increase of B2 O3 concentration whereas the tendency of CaMoO4 to crystallize increased due to preferential charge compensation of BO4 − entities by Na+ ions. 29 Si MAS NMR showed that molybdenum acts as a reticulating agent in glass structure. Trivalent actinides surrogate (Nd3+ ) were shown to enter into CaMoO4 crystals formed in glasses. 相似文献
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Serafino Teseo Emmanuel Lecoutey Daniel J. C. Kronauer Abraham Hefetz Alain Lenoir Pierre Jaisson Nicolas Châline 《Journal of chemical ecology》2014,40(5):429-438
Although cuticular hydrocarbons (CHCs) have received much attention from biologists because of their important role in insect communication, few studies have addressed the chemical ecology of clonal species of eusocial insects. In this study we investigated whether and how differences in CHCs relate to the genetics and reproductive dynamics of the parthenogenetic ant Cerapachys biroi. We collected individuals of different ages and subcastes from several colonies belonging to four clonal lineages, and analyzed their cuticular chemical signature. CHCs varied according to colonies and clonal lineages in two independent data sets, and correlations were found between genetic and chemical distances between colonies. This supports the results of previous research showing that C. biroi workers discriminate between nestmates and non-nestmates, especially when they belong to different clonal lineages. In C. biroi, the production of individuals of a morphological subcaste specialized in reproduction is inversely proportional to colony-level fertility. As chemical signatures usually correlate with fertility and reproductive activity in social Hymenoptera, we asked whether CHCs could function as fertility-signaling primer pheromones determining larval subcaste fate in C. biroi. Interestingly, and contrary to findings for several other ant species, fertility and reproductive activity showed no correlation with chemical signatures, suggesting the absence of fertility related CHCs. This implies that other cues are responsible for subcaste differentiation in this species. 相似文献
5.
Philippe Lenoir Stphane Bila Dominique Baillargeat Serge Verdeyme 《国际射频与微波计算机辅助工程杂志》2005,15(3):278-285
This article presents an electromagnetic tool for the synthesis of manifold multiplexers — the dynamic inverter. By associating this model with the classical circuit model of the filter, the broadband behaviour of each filter can be analysed rapidly and then optimised accurately for an efficient synthesis of the manifold multiplexer. © 2005 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005. 相似文献
6.
This paper describes a method of coupling between finite elements and integral representation, where the numerical scheme is obtained by means of a finite element discretization of a continuous variational problem. A numerical study of the accuracy of this method precedes its application to two classical naval hydrodynamics problems, and we show that the results are very accurate even with a small number of elements. 相似文献
7.
Alain Lenoir Stéphanie Depickère Séverine Devers Jean-Philippe Christidès Claire Detrain 《Journal of chemical ecology》2009,35(8):913-921
The cuticular hydrocarbons (CHCs) of the ant Lasius niger are described. We observe a high local colony specificity of the body cuticular profile as predicted for a monogynous and
multicolonial species. The CHCs show a low geographical variation among different locations in France. The CHCs on the legs
also are colony specific, but their relative quantities are slightly different from those on the main body. For the first
time, we demonstrate that the inner walls of the ant nest are coated with the same hydrocarbons as those found on the cuticle
but in different proportions. The high amount of inner-nest marking and its lack of colony-specificity may explain why alien
ants are not rejected once they succeed in entering the nest. The cuticular hydrocarbons also are deposited in front of the
nest entrance and on the foraging arena, with a progressive increase in n-alkanes relative amounts. Chemical marks laid over
the substrate are colony specific only when we consider methyl-branched alkanes. Our data confirm that these “footprint hydrocarbons”
are probably deposited passively by the contact of ant tarsae with the substrate. These results suggest that the CHCs chemical
profiles used by ants in colony recognition are much more complex than a single template: ants have to learn and memorize
odors that vary depending on their context of perception. 相似文献
8.
In the adult mammalian cochlea, post-injury hair cell losses are considered to be irreversible. Recent studies in cochlear explants of embryonic rodents show that the organ of Corti can replace lost hair cells after injury. We have investigated this topic in vivo during the period of cochlear development. Rat pups were treated with a daily subcutaneous injection of 500 mg/kg amikacin for eight consecutive days between postnatal day 9 (PND 9) and PND 16. During this period the organ of Corti is not fully mature, but hair cells are hyper-sensitive to aminoglycoside antibiotics. Scanning and transmission electron microscopy was used to evaluate morphological changes in the organs of Corti during the treatment and at different post-treatment periods, up until PND 90. A massive loss in outer and inner hair cells was observed at least as early as PND 14. A prominent feature in the apical part of cochleas at PND 21 and 35 was the transient presence of small atypical cells in the region of pre-existing outer hair cells. These atypical cells had tufts of microvilli reminiscent of nascent stereociliary bundles. A second striking observation was the replacement of degenerating inner hair cells by pear-shaped supporting cells throughout the cochlea. These cells were covered with long microvilli, and their basal pole was contacted by both afferent and efferent fibers, as in the early stages of inner hair cell maturation. At PND 55 and 90, these features were not clearly observed due to further cytological changes in the organ of Corti. It is possible that an attempt at hair cell neodifferentiation could occur in vivo after an amikacin treatment in the rat during the period of cochlear hyper-sensitivity to antibiotic. 相似文献
9.
M Montagna O Serova BS Sylla MG Mattei GM Lenoir 《Canadian Metallurgical Quarterly》1996,98(6):738-740
The h-PRL-1 gene codes for a new phosphotyrosine phosphatase that may play an important role in the control of basic cellular processes such as cell growth and proliferation. Using the cDNA of the h-PRL-1 gene as a probe, we examined a somatic mouse and hamster x human hybrid panel and found that chromosomes 1, 17 and 11 harbor sequences homologous to h-PRL-1. By in situ hybridization of metaphase spreads, subchromosomal localizations were determined at bands 1p35-p34, 17q12-q21 and 11q24-q25; in addition, a faint signal was detected at 12q24. The chromosomal assignment of the genes homologous to h-PRL-1 will help the investigation of its possible involvement in human diseases involving genetic alteration at these chromosomal regions. 相似文献
10.
SL Neuhausen S Mazoyer L Friedman M Stratton K Offit A Caligo G Tomlinson L Cannon-Albright T Bishop D Kelsell E Solomon B Weber F Couch J Struewing P Tonin F Durocher S Narod MH Skolnick G Lenoir O Serova B Ponder D Stoppa-Lyonnet D Easton MC King DE Goldgar 《Canadian Metallurgical Quarterly》1996,58(2):271-280
Central to the Mu transpositional recombination are the two chemical steps; donor DNA cleavage and strand transfer. These reactions occur within the Mu transpososome that contains two Mu DNA end segments bound to a tetramer of MuA, the transposase. To investigate which MuA monomer catalyzes which chemical reaction, we made transpososomes containing wild-type and active site mutant MuA. By pre-loading the MuA variants onto Mu end DNA fragments of different length prior to transpososome assembly, we could track the catalysis by MuA bound to each Mu end segment. The donor DNA end that underwent the chemical reaction was identified. Both the donor DNA cleavage and strand transfer were catalyzed in trans by the MuA monomers bound to the partner Mu end. This arrangement explains why the transpososome assembly is a prerequisite for the chemical steps. 相似文献