检索结果-南通市图书馆

Expression and modulation of neuroligin and neurexin in the olfactory organ of the cotton leaf worm Spodoptera fittoralis

在线全文

学校读者我要写书评

暂无评论

Insect Science 2017年第2期24卷 210-221页

作者： Nicolas Durand Thomas Chertemps Francoise Bozzolan Martine Maibeche sorbonne universites upmc - univ paris 06 Institut d'Ecologie et des Sciences de 'Environnement de Paris INRA CNRS IRD UPECD6partement d'Ecologie Sensorielle F-75252 Paris France

Carboxylesterases are enzymes widely distributed within living organisms. In insects, they have been mainly involved in dietary metabolism and detoxification function. Interestingly, several members of this family called carboxylesterase-like ad- hesion molecules （CLAMs） have lost their catalytic properties and are mainly involved in neuro/developmental functions. CLAMs include gliotactins, neurotactins, glutactins, and neuroligins. The latter have for binding partner the neurexin. In insects, the function of these proteins has been mainly studied in Drosophila central nervous system or neuro- muscular junction. Some studies suggested a role of neuroligins and neurexin in sensory processing but CLAM expression within sensory systems has not been investigated. Here, we reported the identification of 5 putative CLAMs expressed in the olfactory system of the model pest insect Spodoptera littoralis. One neuroligin, Slnlg4-yll and its putative binding partner neurexin Slnrxl were the most expressed in the antennae and were surprisingly associated with olfactory sensilla. In addition, both transcripts were upregulated in male antennae after mating, known to modulate the sensitivity of the peripheral olfactory system in S. littoralis, suggesting that these molecules could be involved in sensory plasticity.

关键词： carboxylesterase-like adhesion molecules insect neurexin neuroligins olfaction

Recovering Navier–Stokes Equations from Asymptotic Limits of the Boltzmann Gas Mixture Equation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2016年第5期65卷 553-562页

作者： Carlo Bianca Christian Dogbe Laboratoire de Physique Statistique Ecole Normale Superieure PSL Research University University Paris Diderot Sorbonne Paris-Cite Sorbonne Universites UPMC Univ Paris 06 CNRS Department of Mathematics Universite de Caen Normandie LMNOCNRS

This paper is devoted to the derivation of macroscopic fluid dynamics from the Boltzmann mesoscopic dynamics of a binary mixture of hard-sphere gas *** the hydrodynamics limit is performed by employing different time and space *** paper shows that,depending on the magnitude of the parameters which define the scaling,the macroscopic quantities(number density,mean velocity and local temperature)are solutions of the acoustic equation,the linear incompressible Euler equation and the incompressible Navier–Stokes *** derivation is formally tackled by the recent moment method proposed by[***,et al.,***.63(1991)323]and the results generalize the analysis performed in[***,et al.,*** ***.29(2015)240].

关键词： gas mixtures hydrodynamic limit asymptotic limit fluid equation conservation law

Raman-Brillouin interplay for inertial confinement fusion relevant laser-plasma interaction

在线全文

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2016年第3期4卷 23-38页

作者： C.Riconda S.Weber LULI-upmc universitparis 6:sorbonne universits CNRSEcole PolytechniqueCEA:Universit Paris-Saclay Institute of Physics of the ASCR

The co-existence of the Raman and Brillouin backscattering instability is an important issue for inertial confinement fusion. The present paper presents extensive one-dimensional(1D) particle-in-cell(PIC) simulations for a wide range of parameters extending and complementing previous findings. PIC simulations show that the scenario of reflectivity evolution and saturation is very sensitive to the temperatures, intensities, size of plasma and boundary conditions employed. The Langmuir decay instability is observed for rather small k_(epw)λ_D but has no influence on the saturation of Brillouin backscattering, although there is a clear correlation of Langmuir decay instability modes and ion-fractional decay for certain parameter ranges. Raman backscattering appears at any intensity and temperature but is only a transient phenomenon. In several configurations forward as well as backward Raman scattering is observed. For the intensities considered, I λ_o^2 above 10^(15) W μm^2/cm^2, Raman is always of bursty nature. A particular setup allows the simulation of multi-speckle aspects in which case it is found that Raman is self-limiting due to strong modifications of the distribution function. Kinetic effects are of prime importance for Raman backscattering at high temperatures. No unique scenario for the saturation of Raman scattering or Raman–Brillouin competition does exist. The main effect in the considered parameter range is pump depletion because of large Brillouin backscattering. However, in the low k_(epw)λ_D regime the presence of ion-acoustic waves due to the Langmuir decay instability from the Raman created electron plasma waves can seed the ion-fractional decay and affect the Brillouin saturation.

关键词： Brillouin backscattering inertial confinement fusion kinetic effects laser-plasma interaction parametric instabilities particle-in-cell simulations Raman backscattering

Hierarchical mechanical behavior of cobalt supracrystals related to nanocrystallinity

在线全文

学校读者我要写书评

暂无评论

Nano Research 2015年第11期8卷 3480-3487页

作者： Melanie Gauvin sorbonne universites UPMC Univ Paris 06 UMR 8233 MONARIS Paris F-75005 France CNRS UMR 8233 MONARIS Paris F-75005 France CEA/IRAMIS CEA Saclay Gif-sur-Yvette 91191 France

Here, we report on hierarchical mechanical behavior of 500-nm-thick Conanocrystal 3D superlattices （supracrystals） induced by either the crystalline structure （nanocrystallinity） or the length of the coating agent of Co nanocrystals. Increasing the nanocrystal shape anisotropy of Co nanocrystals through the control of their nanocrystallinities induces a higher level of ordering with both translational and orientational alignment of nanocrystals within the supracrystals. The hierarchy in ordering at various scales, i.e., from the atomic lattice within the nanocrystals to the nanocrystal superlattices within supracrystals, is correlated with marked changes in the Young＇s modulus of supracrystals： From 0.7 ±0.4 to 1.7 ±0.5 and to 6.6 ±1.5 GPa as the crystalline structure of Co nanoparticles changes from amorphous-Co to ε-Co and to hexagonal compact packing （hcp）-Co, respectively. Moreover, for supracrystals of 7 nm amorphous Co nanoparticles, the Young＇s modulus decreases by one order of magnitude from 0.7 ±0.4 to 0.08 ±0.03 GPa upon reducing the alkyl chain length of the ligands coating the Co nanoparticles from C18 （oleic acid） to C12 （lauric acid）. The hierarchical mechanical behavior is rationalized using a dimensional model of the stress-strain relationship in supracrystals.

关键词： supracrystal crystallinity anisotropy orientational alignment mechanical properties

Consequence of shape elongation on emission asymmetry for colloidal CdSe/CdS nanoplatelets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2018年第7期11卷 3593-3602页

作者： Fu Fengt Loan Thu Nguyen Michel Nasilowski Brice Nadal Benoit Dubertret Laurent Coolent Agnes Maitre sorbonne universites UPMC Univ Paris 06 CNRS-UMR 7588 Institut des NanoSciences de Paris F-75005 Paris France Institute of Materials Science Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road Cau Giay Dist. 100000 Hanoi Vietnam Laboratoire de Physique et d'Etude des Materiaux ESPCI UPMC Univ Paris 6 CNRS 10 rue Vauquelin F-75005 Paris France

In this paper, we demonstrate that for colloidal CdSe/CdS nanoplatelets, a rectangular shape induces emission asymmetry, in terms of both polarization and emission patterns. Polarimetry and emission pattern analyses are combined to provide information on the orientation of the transition dipoles involved in the nanoplatelet emission. It is shown that for rectangular nanoplatelets, the emission is polarized and the emission patterns are anisotropic, whereas they remain nonpolarized and isotropic for square nanoplatelets. This can be appropriately described by the dielectric antenna effect induced by the elongated shape of the rectangular platelet.

关键词： colloidal semiconductor nanoplatelet emission dipole emission polarization emission pattern

Solving the Dyson-Schwinger equation around its first singularities in the Borel plane

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of physics 2016年第6期11卷 25-30页

作者： Clavier, Pierre J. Bellon, Marc P. sorbonne universites UPMC Univ Paris 06 UMR 7589 LPTHE Paris France (GRID:grid.5805.8) (ISNI:***) CNRS UMR 7589 LPTHE Paris France (GRID:grid.4444.0) (ISNI:0000 0001 2112 9282)

The Dyson-Schwinger equation of the massless Wess-Zumino model is written as an equation over the anomalous dimension of the theory. Its asymptotic behavior is derived and the procedure to compute the perturbations of this asymptotic behavior is detailed. This procedure uses ill-defined objects. To solve this, the Dyson-Schwinger equation is rewritten for the Borel plane. It is shown that the ill- defined procedure in the physical plane can be applied in the Borel plane. Other results obtained in the Borel plane are stated and the proof for one result is described.

关键词： Dyson-Schwinger equation Wess-Zumino model Borel transform

Highly efficient genome editing using oocyte-specific zcas9 transgenic zebrafish

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2018年第9期45卷 509-512页

作者： Yuanyuan Liu Chong Zhang Yanjun Zhang Siyao Lin De-Li Shi Ming Shao School of Life Science Shandong University Taishan College Shandong University sorbonne universites UPMC Univ Paris 06CNRS UMR7622IBPS-Developmental Biology Laboratory

Since its first application to induce mutations in mammalian cells （Cong et al., 2013： Mall et al., 2013）, CRISPR/Cas9 has rapidly become a routine technique to perform genome editing in a variety of biological systems due to its facile, robust, and multiplexable fea- tures （Hwang et al, 2013; Wang et al., 2013; Guo et al., 2014; Liu, 2017）.

关键词： PCR RT Highly efficient genome editing using oocyte-specific zcas9 transgenic zebrafish

Optical response and SERS properties of individual large scale supracrystals made of small silver nanocrystals

在线全文

学校读者我要写书评

暂无评论

Nano Research 2015年第5期8卷 1615-1626页

作者： Pierre Aubertin Mohamed Ali Ben Aissa Noureddine Raouafi Suzanne Joiret Alexa Courty Emmanuel Maisonhaute sorbonne universites UPMC Univ Paris 06 UMR 8235 Laboratoire Interfaces et Systemes Electrochimiques F-75005 Paris France CNRS UMR 8235 LISE F-75005 Paris France sorbonne universites UPMC Univ Paris 06 UMR 8233 Laboratoire MONARIS F-75005 Paris France CNRS UMR 8233 Laboratoire MONARIS F-75005 Paris France Laboratoire de Chimie Analytique et Electrochimie Departement de Chimie Faculte des Sciences de Tunis Universite de Tunis El Manar Campus universitaire de Tunis EI-Manar 2092 Tunis El Manar Tunisie

There is a considerable interest in producing and understanding the optical and spectroscopic properties of ordered nanoparticle assemblies. Herein, we describe and interpret the optical absorbance and Raman properties of 5.9 nm ± 0.3 nm diameter silver nanocrystals coated with dodecanethiol and organized in highly ordered 3D superlattices of different heights. Each superlattice was studied individually, which allowed to elaborate a model based on Maxwell-Garnett theory to reproduce qualitatively the height and wavelength dependence of the absorbance. Importantly, because of their small size compared to that of traditional nanoparticles used in Surface Enhanced Raman Spectroscopy （SERS）, the large 3D distribution of hot spots generated by the silver superlattices allowed to easily obtain SERS spectra of the surrounding ligands despite their intrinsic low Raman cross section. Accordingly, traces of thiophenol could be detected very easily.

关键词： nanoparticles nanocrystals superlatfices supracrystals surface enhanced Raman spectroscopy (SERS) plasmonic properties organization

X-ray microscopic investigation of molecular orientation in a hole carrier thin film for organic solar cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2018年第5期11卷 2771-2782页

作者： Quentin Arnoux Benjamin Watts Sufal Swaraj Francois Rochet Ludovic Tortech Laboratoire de Chimie Physique Matiere et Rayonnement (LCPMR) UMR 7614 Sorbonne Universites UPMC Univ Paris 06 Paris F-75005 France Institut parisien de Chimie Moleculaire (IPCM) UMR 8232 Sorbonne Universites UPMC Univ Paris 06 Paris F-75005 France Laboratoire d'Innovation en Chimie des Surfaces et Nanosciences (LICSEN) NIMBE UMR 3685 CEA Saday Gif-sur-Yvette F-91191 France Paul Scherrer Institute Villigen Psi 5232 Switzerland Synchrotron SOLEIL L'Orme des Merisiers Saint-Aubin BP 48 Gif-sur-Yvette F-91192 France

As dipyranylidenes are excellent hole carriers, applications in organic solar cells or organic light emitting diode are envisaged. In the present study, we investigate the morphology of 2,2＇,6,6＇-tetraphenyl-4,4＇-dipyranylidene （DIPO-Ph4） deposited under vacuum on a silicon nitride （Si3N4） substrate, a paradigmatic system for the study of molecular crystal/inorganic substrate interfaces. Samples with various coating ratios and different thermal treatments were prepared. The films were characterized by atomic force microscopy and scanning transmission X-ray microscopy to gain insight into material growth. The results show a change in orientation at a molecular level depending upon the evaporation conditions. We are now able to tailor an organic layer with a specific molecular orientation and a specific electronic behavior.

关键词： organic solar cells scanning transmission X-ray microscopy molecular orientation inorganic/organic interface