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Metamorphosis of Magnetospirillum magneticum AMB-1 cells

Chinese Journal of Oceanology and Limnology 2010年第2期28卷 304-309页

作者：张风丽张葵赵三军肖天 Michel deNIS 吴龙飞 laboratoire de Chimie Bactérienne UPR9043 Institut de Biologie Structurale et Microbiologie Laboratory of Marine Biotechnology School of Life Sciences & Biotechnology Key Laboratory of Microbial Metabolism Ministry of Education Shanghai Jiao Tong University laboratoire de microscopies et d’etude de nanostructures (lmen) Université de Reims Key Laboratory of Marine Ecology & Environmental Sciences Institute of Oceanology Chinese Academy of Sciences laboratoire de Microbiologie Géochimie et Ecologie Marines CNRS UMR6117 Centre d'Océanologie de Marseille Université de la Méditerranée

Magnetospirillum magneticum strain AMB-1 belongs to the family of magnetotactic bacteria. It possesses a magnetosome chain aligning, with the assistance of cytoskeleton filaments MamK, along the long axis of the spiral cells. Most fresh M. magneticum AMB-1 cells exhibit spiral morphology. In addition, other cell shapes such as curved and spherical were also observed in this organism. Interestingly, the spherical cell shape increased steadily with prolonged incubation time. As the actin-like cytoskeleton protein MreB is involved in maintenance of cell shapes in rod-shaped bacteria such as Escherichia coli and Bacillus subtilis, the correlation between MreB protein levels and cell shape was investigated in this study. Immunoblotting analysis showed that the quantity of MreB decreased when the cell shape changed along with incubation time. As an internal control, the quantity of MamA was not obviously changed under the same conditions. Cell shape directs cell-wall synthesis during growth and division. MreB is required for maintaining the cell shape. Thus, MreB might play an essential role in maintaining the spiral shape of M. magneticum AMB-1 cells.

关键词： Magnetotactic bacteria Magnetospirillum magneticum AMB-1 MreB

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Optimised NSAIds-loaded Biocompatible Nanoparticles

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Nano-Micro Letters 2010年第4期2卷 247-255页

作者： V.Gaelle ROULLIN Maaite CALLEWAERT Michael MOLINARI Franck deLAVOIE Aurelie SECONde Marie-Christine ANdRY Institut de Chimie Mole culaire de Reims CNRS UMR 6229UFR Pharmacie Reims laboratoire de microscopies et d’etudes des nanostructures UFR des SciencesUniversitéde Reims Champagne-Ardenne laboratoire de Microscopie Electronique Analytique INSERM UMRS 92621 rue Clement Ader51685 Reims Cedex 2France

In this formulation study,biocompatible non steroidal anti-inflammatory(NSAIds)-loaded nanoparticles were designed as models to be further integrated in a prosthesis surface functionalization.A modified spontaneous emulsion-solvent diffusion methodology was used to produce drug-loaded PLGA nanoparticles without any purification or solvent evaporation *** parameters,such as lactide/glycolide ratio,polymer concentration,solvent/non solvent ratio and non solvent phase,as well as the non ionic tensioactive P188 co-precipitation composition were systematically *** optimized formulation(mean size:145 nm,surface charge:-13 m V) was employed to encapsulate various amounts of NSAIds in a simple and scalable *** drug release was characterized in vitro by a complete release for 48 *** results encourage upcoming preliminary steps for in vivo experiments of prosthesis surface functionalization.

关键词： drug delivery systems(ddS) Biocompatible Emulsion-solvent diffusion method PLGA Glycofurol Non steroidal anti-inflammatory drugs(NSAIds)

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Recent advances in development of vertical-cavity based short pulse source at 1.55 μm

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Frontiers of Optoelectronics 2014年第1期7卷 1-19页

作者： Zhuang ZHAO Sophie BOUCHOULE Jean-Christophe HARMANd Gilles PATRIARCHE Guy AUBIN Jean-Louis OUdAR laboratoire de Photonique et de nanostructures (LPN) CNRS Marcoussis France

This paper reviews and discusses recent developments in passively mode-locked vertical external cavity surface emitting lasers （ML-VECSELs） for short pulse generation at 1.55 gin. After comparing ML- VECSELs to other options for short pulse generation, we reviewed the results of ML-VECSELs operating at telecommunication wavelength and point out the chal- lenges in achieving sub-picosecond operation from a ML- VECSEL at 1.55 gm. We described our recent work in the VECSELs and semiconductor saturable absorber mirrors （SESAMs）, their structure design, optimization and characterization, with the goal of moving the pulse width from picosecond to sub-picosecond.

关键词： semiconductor laser vertical external cavitysurface emitting laser (VECSEL) indium phosphide heatdissipation saturable absorber mirror mode-locking

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Characterization of Mediterranean Magnetotactic Bacteria

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Journal of Ocean University of China 2007年第4期6卷 355-359页

作者： Lefevre Christopher Bemadac Alain Pradel Nathalie WU Longfei Yu-Zhang Kui XIAO Tian Yonnet Jean-Paul Lebouc Afef SONG Tao Fukumori Yoshihiro laboratoire de Chimie Bactkrienne UPR 9043 CNRS Marseille France Service de Microscopic Electronique lnstitut de Biologic Structurale et Microbiologie CNRS Marseille France laboratoire de microscopies et d＇etude de nanostructures （lmen） Universite de Reims Champagne-Ardenne 51687 Reims cedex 2 France Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 P. R. China laboratoire d＇Electrotechnique de Grenoble Institut National Polytechniques de Grenoble F-38402 Saint Martin d＇eres Cedex France Institute of Electrical Engineering Chinese Academy of Science Beijing 100080 P. R. China department of Life Science Graduate School of Nataral Science and Technology Kanazawa University Kanazawa Japan

Magnetotactic bacteria are a diverse group of motile prokaryotes that are ubiquitous in aquatic habitats and cosmopolitan in distribution. In this study, we collected magnetotactic bacteria from the Mediterranean Sea. A remarkable diversity of morphotypes was observed, including multicellular types that seemed to differ from those previously found in North and South America. Another interesting organism was one with magnetosomes arranged in a six-stranded bundle which occupied one third of the cell width. The magnetosome bundle was evident even under optic microscopy. These cells were connected together and swam as a linear entire unit. Magnetosomes did not always align up to form a straight linear chain. A chain composed of rectangle magnetosomes bent at a posi- tion with an oval crystal. High resolution transmission electron microscopy analysis of the crystal at the pivotal position suggested uncompleted formation of the crystal. This is the first report of Mediterranean magnetotactic bacteria, which should be useful for studies of biogeochemical cycling and geohistory of the Mediterranean Sea.

关键词： Magnetotactic bacteria Mediterranean Sea geomagnetism biogeochemical cycling ecology magnetosome crystals

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Extreme multiexciton emission from deterministically assembled single-emitter subwavelength plasmonic patch antennas

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Light(Science & Applications) 2020年第1期9卷 1697-1705页

作者： Amit Raj dhawan Cherif Belacel Juan Uriel Esparza-Villa Michel Nasilowski Zhiming Wang Catherine Schwob Jean-Paul Hugonin Laurent Coolen Benoit dubertret Pascale Senellart Agnes Maitre Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054People’s Republic of China Sorbonne Universite CNRSInstitut des Nanosciences de ParisUMR 758875005 ParisFrance Centre de Nanosciences et de Nanotechnologies et de nanostructures CNRS UMR9001Universite Paris-Saclay10 boulevard Thomas Gobert91120 MarcoussisFrance laboratoire de Physique et d’etude des Materiaux ESPCI-ParisTechPSL Research UniversitySorbonne UniversiteCNRS UMR 821310 rue VauquelinParis 75005France laboratoire Charles Fabry Institut d’Optique Graduate SchoolCNRS UMR 8501Universite Paris Saclay2 avenue Augustin Fresnel91127 Palaiseau CedexFrance

Coupling nano-emitters to plasmonic antennas is a key milestone for the development of nanoscale quantum light *** challenge,however,is the precise nanoscale positioning of the emitter in the ***,we present a laser etching protocol that deterministically positions a single colloidal CdSe/CdS core/shell quantum dot emitter inside a subwavelength plasmonic patch antenna with three-dimensional nanoscale *** exploiting the properties of metal–insulator–metal structures at the nanoscale,the fabricated single-emitter antenna exhibits a very high-Purcell factor(>72)and a brightness enhancement of a factor of *** to the unprecedented quenching of Auger processes and the strong acceleration of the multiexciton emission,more than 4 photons per pulse can be emitted by a single quantum dot,thus increasing the device *** technology can be applied to a wide range of photonic nanostructures and emitters,paving the way for scalable and reliable fabrication of ultracompact light sources.

关键词： patch precise acceleration

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Single step fabrication of N-doped graphene/Si3N4/SiC heterostructures

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Nano Research 2014年第6期7卷 835-843页

作者： Emilio Velez-Fort Emiliano Pallecchi Mathieu G. Silly Mounib Bahri Gilles Patriarche Abhay Shukla Fausto Sirotti Abdelkarim Ouerghi CNRS-laboratoire de Photonique et de nanostructures (LPN) Route de Nozay Marcoussis 91460 France Universite Pierre et Marie Curie (CNRS - IMPMC) 4 PL Jussieu Paris 75005 France Synchrotron-SOLEIL Saint-Aubin BP48 F91192 Gif sur Yvette Cedex France

In-plane heteroatom substitution of graphene is a promising strategy to modify its properties. The ability to dope graphene with electron-donor nitrogen heteroatoms is highly important for modulating electrical properties of graphene. Here we demonstrate a transfer-free method to directly grow large area quasi free-standing N-doped graphene bilayers on an insulating substrate （Si3N4）. Electron-bombardment heating under nitrogen flux results in simultaneous growth of N-doped graphene and a Si3N4 layer on the SiC surface. The decoupling of N-doped graphene from the substrate and the presence of Si3N4 are identified by X-ray photoemission spectroscopy and low-energy electron diffraction. The substitution of nitrogen atoms in the graphene planes was confirmed using high resolution X-ray photoemission spectroscopy which reveals several atomic configurations for the nitrogen atoms： Graphitic-like, pyridine-like, and pyrrolic- like. Furthermore, we demonstrated for the first time that N-doped graphene could be used to efficiently probe oxygen molecules via nitrogen atom defects.

关键词： epitaxial graphene spectroscopy nitrogen-doped graphene low-energy electronmicroscopy electronic properties

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热喷涂FeAl涂层中纳米晶结构的XRd分析

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金属学报 2005年第10期41卷 1013-1019页

作者：嵇罡 T.Grosdidier 高泰瑞 A.Tidu 邹建新董闯 laboratoire d' etudes et de Recherches sur les Matériaux les Procédés et les Surfaces EA 3316 Université de Technologie de Belfort-Montbéliard Site de Sevenans laboratoire d' etude des Textures et Application aux Matériaux laboratoire d'etude des Textures et Application aux Matériaux 大连理工大学三束材料改性国家重点实验室大连116024

利用超音速火焰喷涂(HVOF)和大气等离子喷涂(APS)工艺分别喷涂了雾化(微米结构的)以及球磨(纳米结构的)Fe-Al粉末制备了不同结构的涂层.两种原料粉末和喷涂工艺均引起涂层的XRd峰异常宽化.由宽化峰给出的晶粒尺寸与TEM测出的晶粒尺寸有... 详细信息

利用超音速火焰喷涂(HVOF)和大气等离子喷涂(APS)工艺分别喷涂了雾化(微米结构的)以及球磨(纳米结构的)Fe-Al粉末制备了不同结构的涂层.两种原料粉末和喷涂工艺均引起涂层的XRd峰异常宽化.由宽化峰给出的晶粒尺寸与TEM测出的晶粒尺寸有较大的差异.结合SEM、电子探针以及TEM的测试结果,同时考虑到涂层中形成的结构缺陷以及化学成分的不均匀性,证实异常宽化来自喷涂过程中由于Al的耗损导致的FeAl相中Al的成分不均匀分布.

关键词： FleAl基涂层热喷涂纳米晶结构 X射线衍射

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Self-organized metal-semiconductor epitaxial graphene layer on off-axis 4H-SiC（0001）

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Nano Research 2015年第3期8卷 1026-1037页

作者： debora Pierucci Haikel Sediri Mahdi Hajlaoui Emilio Velez-Fort Yannick J. dappe Mathieu G. Silly Rachid Belkhou Abhay Shukla Fausto Sirotti Noelle Gogneau Abdelkarim Ouerghi CNRS- laboratoire de Photonique et de nanostructures Route de Nozay 91460 Marcoussis France Synchrotron-SOLEIL Saint-Aubin BP48 F91192 Gifsur Yvette Cedex France Universite Pierre et Marie Curie (CNRS - IMPMC) 4 PI. Jussieu 75005 Paris France Service de Physique de retat Condense (CNRS URA2464) IRAMIS CEA Saclay 91191 Gif-Sur-Yvette France

The remarkable properties of graphene have shown promise for new perspectives in future electronics, notably for nanometer scale devices. Here we grow graphene epitaxially on an off-axis 4H-SiC（0001） substrate and demonstrate the formation of periodic arrangement of monolayer graphene on planar （0001） terraces and Bernal bilayer graphene on （1120） nanofacets of SiC. We investigate these lateral superlattices using Raman spectroscopy, atomic force microscopy/ electrostatic force microscopy （AFM/EFM） and X-ray and angle resolved photoemission spectroscopy （XPS/ARPES）. The correlation of EFM and ARPES reveals the appearance of permanent electronic band gaps in AB-stacked bilayer graphene on （1120） SiC nanofacets of 150 meV. This feature is confirmed by density functional theory （dFT） calculations. The charge transfer between the substrate and graphene bilayer results in an asymmetric charge distribution between the top and the bottom graphene layers opening an energy gap. This surface organization can be thus defined as self-organized metal-semiconductor graphene.

关键词： epitaxial graphene layer monolayer bilayer band gap opening Bernal stacking off-axis silicon carbide electronic properties

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Metallic nanostructures for efficient LEd lighting

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Light(Science & Applications) 2016年第1期5卷 778-787页

作者： Gabriel Lozano Said RK Rodriguez Marc A Verschuuren Jaime Gómez Rivas Instituto de Ciencia de Materiales de Sevilla Consejo Superior de Investigaciones Científicas-Universidad de Sevilla(CSIC-US)41092 SevillaSpain laboratoire de Photonique et de nanostructures(LPN) Centre National de la Recherche Scientifique(CNRS)91460 MarcoussisFrance Philips Research Laboratories 5656AE EindhovenThe Netherlands dutch Institute for Fundamental Energy Research 5600 HH EindhovenThe Netherlands COBRA Research Institute Technical University of EindhovenEindhovenThe Netherlands

Light-emitting diodes(LEds)are driving a shift toward energy-efficient ***,modifying the emission intensities,colors and directionalities of LEds in specific ways remains a challenge often tackled by incorporating secondary optical *** nanostructures supporting plasmonic resonances are an interesting alternative to this approach due to their strong light–matter interaction,which facilitates control over light emission without requiring external secondary optical *** review discusses new methods that enhance the efficiencies of LEds using nanostructured *** is an emerging field that incorporates physics,materials science,device technology and ***,we provide a general overview of state-of-the-art LEd lighting,discussing the main characteristics required of both quantum wells and color converters to efficiently generate white ***,we discuss the main challenges in this field as well as the potential of metallic nanostructures to circumvent *** review several of the most relevant demonstrations of LEds in combination with metallic nanostructures,which have resulted in light-emitting devices with improved *** also highlight a few recent studies in applied plasmonics that,although exploratory and eminently fundamental,may lead to new solutions in illumination.

关键词： light-emitting diodes nanophotonics plasmonics solid-state lighting

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Soft nanoimprint lithography

Soft nanoimprint lithography

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Photonics Asia 2004;Optoelectronics,Microelectronics,and Nanotech

作者： E.Roy Y. Kanamori M.Belotti d.decanini laboratoire de Photonique et de nanostructures CNRS 91460 Marcoussis France laboratoire de Photonique et de nanostructures CNRS 91460 Marcoussis France laboratoire de Photonique et de nanostructures CNRS 91460 Marcoussis France laboratoire de Photonique et de nanostructures CNRS 91460 Marcoussis France

We developed a UV assisted soft nanoimprint lithography (UV-SNIL) that can be applied for the reproduction of nanometer features over large areas. Based on a simple argument deduced from the Navier-St

关键词： nanoimprint, soft lithography, soft stamps, molding pattern replication, nanofabrication

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