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Endohedral functionalisation of multi-wall carbon nanotubes by acidic cesium salt of Preyssler in nanosize

MIcRO & NANO LETTERS 2014年第3期9卷 198-201页

作者： Bamoharram, F. F. Hasanzadeh, N. Heravi, M. M. Ahmadpour, A. Ayati, A. Sillanpaa, M. Islamic Azad Univ Mashhad Branch Dept Chem Mashhad 91735413 Iran Alzahra Univ Dept Chem Tehran *** Iran Ferdowsi Univ Mashhad Dept Chem Engn Mashhad *** Iran Lappeenranta Univ Technol Dept Chem Lab Green Chem FI-50100 Mikkeli Finland

Nanoparticles of acidic cesium salt of Preyssler by a one-step solid-state reaction at room temperature, were synthesised and characterised by Fourier transform infrared spectroscopy, titration, inductively coupled plasma and transmission electron microscopy (TEM), respectively. These uniform nanoparticles showed an average size of 2-10 nm. Multi-walled carbon nanotubes (MWcNTs) were synthesised by the catalytic chemical vapour deposition method and used as nanostructured porous supports for the immobilisation of the nanoparticles of the acidic cesium salt of Preyssler. The TEM image showed a bamboo-like structure with inner and outer diameters of about 20 and 35 nm, respectively. The modification of the MWcNTs by the synthesised nanoparticles was successfully achieved via the impregnation method. The infrared analysis showed that the basic structure of Preyssler is preserved and left intact. The TEM images also showed an endohedral functionalisation of the MWcNTs.

关键词： carbon nanotubes nanoparticles nanofabrication Fourier transform spectra infrared spectra plasma materials processing transmission electron microscopy particle size catalysis chemical vapour deposition nanoporous materials c impregnation method bamboo-like structure nanostructured porous supports catalytic chemical vapour deposition particle size TEM transmission electron microscopy inductively coupled plasma treatment titration process Fourier transform infrared spectroscopy solid-state reaction nanoparticles Preyssler acidic cesium salt multiwall carbon nanotubes endohedral functionalisation

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Fluorine insertion in inorganic materials

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cURRENT OPINION IN SOLID STATE & MATERIALS ScIENcE 1998年第2期3卷 132-136页

作者： Greaves, c Francesconi, MG Univ Birmingham Sch Chem Birmingham B15 2TT W Midlands England

In recent years, research into the chemistry of high temperature superconducting copper oxides has witnessed a noticeable shift towards a detailed investigation of chemical manipulation of the anion (rather than the cation) sublattice, not only to achieve optimum electronic properties but also to create new superconducting phases, Reactions involving the low temperature insertion of fluorine have played a key role, and have rekindled interest in alternative synthetic strategies for oxide fluoride superconductors. Fluorine insertion into fullerenes has also attracted attention due to its potential for the synthesis of new materials with unique properties.

关键词： T Tetragonal structure of K 2 NiF 4 (and substituted La 2 cuO 4 ) T′ Tetragonal structure of Nd 2 cuO 4 T c Superconducting transition temperature XPS X-ray photoelectron spectroscopy XRD X-ray diffraction YBcO YBa 2 cu 3 O 7−δ

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Fabrication of carbons dendritic hierarchical structure via easy copper substrate-induced solvothermal process at low temperature

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MIcRO & NANO LETTERS 2012年第3期7卷 265-267页

作者： Zhu, Lingling Xiao, Peipei Qian, Yitai Univ Sci & Technol China Hefei Natl Lab Phys Sci Microscale Hefei 230026 Peoples R China Univ Sci & Technol China Dept Chem Hefei 230026 Peoples R China

Three-dimensional hierarchical dendritic carbon structures with high densities of secondary carbon nanosheets have been fabricated using a solvothermal growth via reacting metal Na with tetrachloromethane in 200 degrees c on cu ribbon. Field-emission scanning electron microscopy and transmission electron microscopy images of the as-prepared sample shows that 3D hierarchical dendritic carbon structures are composed of carbon nanosheets with the thickness of about 20 nm. The powder X-ray diffraction and Raman spectra reveal the low graphitisation degree of the as-prepared sample. A possible formation mechanism has been proposed.

关键词： Whiskers and dendrites: growth, structure, and nonelectronic properties Low-dimensional structures: growth, structure and nonelectronic properties Powder techniques, compaction and sintering Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials c dendrites transmission electron microscopy formation mechanism graphitisation degree Deposition from liquid phases (melts and solutions) secondary carbon nanosheets scanning electron microscopy three-dimensional hierarchical dendritic carbon structure X-ray diffraction tetrachloromethane Raman spectra field emission electron microscopy Infrared and Raman spectra in inorganic crystals Optical properties of other inorganic semiconductors and insulators (thin films/low-dimensional structures) copper substrate-induced solvothermal process powder technology liquid phase deposition powder X-ray diffraction temperature 200 degc carbon nanostructured materials graphitisation field-emission scanning electron microscopy nanofabrication Methods of nanofabrication and processing

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Fabrication of polyvinyl alcohol/multi-walled carbon nanotubes composite electrospun nanofibres and their application as microwave absorbing material

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MIcRO & NANO LETTERS 2013年第8期8卷 455-459页

作者： Salimbeygi, Golestan Nasouri, Komeil Shoushtari, Ahmad Mousavi Malek, Reza Mazaheri, Firoozmehr Amirkabir Univ Technol Dept Text Engn Tehran 158754413 Iran

Polyvinyl alcohol (PVA)/sodium dodecyl sulphate (SDS)/multi-walled carbon nanotubes (MWcNTs) composite nanofibres with various MWcNT contents (up to 10 wt%) were fabricated by electrospinning process and their microwave absorption properties were evaluated by a vector network analyser in the frequency range of 8-12 GHz (X-band) at room temperature. Scanning electron microscopy analysis of the nanofibre samples revealed that the deformation of the nanofibres increases with increasing MWcNT concentration. Very smooth surfaces of the composite electrospun nanofibres even for nanofibres with concentration of 10 wt% MWcNT have been successfully prepared because of the high stability dispersion of MWcNTs. It was observed that the absorption microwave properties improved by increasing the loading levels of MWcNTs. Finally, the PVA/SDS/MWcNT composite nanofibres sample with 10 wt% content of MWcNT has shown a reflection loss of 15 dB at a frequency of 8 GHz.

关键词： carbon nanotubes deformation microwave materials nanocomposites nanofabrication scanning electron microscopy electrospinning nanofibres polyvinyl alcohol PVA multiwalled carbon nanotubes MWcNT composite electrospun nanofibres microwave absorbing material sodium dodecyl sulfate SDS electrospinning process microwave absorption properties vector network analyser X-band scanning electron microscopy deformation stability dispersion frequency 8 GHz to 12 GHz temperature 293 K to 298 K c

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EFFEcT OF cALcIUM ON THE INTERAcTIONS BETWEEN cA-2+-ATPASE MOLEcULES IN SARcOPLASMIc-RETIcULUM

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BIOcHIMIcA ET BIOPHYSIcA AcTA 1989年第3期984卷 326-338页

作者： KERESZTES, T JONA, I PIKULA, S VEGH, M MULLNER, N PAPP, S MARTONOSI, A SUNY HLTH SCI CTR DEPT BIOCHEM & MOLEC BIOL SYRACUSE NY 13210 USA

The interaction between ca2+-ATPase molecules in the native sarcoplasmic reticulum membrane and in detergent solutions was analyzed by chemical crosslinking, high performance liquid chromatography (HPLc), and by the polarization of fluorescence of fluorescein 5''-isothiocyanate (FITc) covalently attached to the ca2+-ATPase. Reaction of sarcoplasmic reticulum vesicles with glutaraldehyde causes the crosslinking of ca2+-ATPase molecules with the formation of dimers, tetramers and higher oligomers. At moderate concentrations of glutaraldehyde solubilization of sarcoplasmic reticulum by c12E8 or Brij 36T (.simeq. 4 mg/mg protein) decreased the formation of higher oligomers without significant interference with the appearance of crosslinked ATPase dimers. These observations are consistent with the existence of ca2+-ATPase dimers in detergent-solubilized sarcoplasmic reticulum. ca2+ (2-20 mM) and glycerol (10-20%) increased the degree of crosslinking at pH 6.0 both in vesicular and in solubilized sarcoplasmic reticulum, presumably by promoting interactions between ATPase molecules;at pH 7.5 the effect of ca2+ was less pronounced. In agreement with these observations, high performance liquid chromatography of sarcoplasmic reticulum proteins solubilized by Brij 36T or c12E10 revealed the presence of components with the expected elution characteristics of ca2+-ATPase oligomers. The polarization of fluorescence of FITc covalently attached to the ca2+-ATPase is low in the native sarcoplasmic reticulum due to energy transfer, consistent with the existence of ATPase oligomers (Highsmith, S. and cohen, J.A. (1987) Biochemistry 26, 154-161);upon solubilization of the sarcoplasmic reticulum by detergents, the polarization of fluorescence increased due to dissociation of ATPase oligomers. Based on its effects on the fluorescence of FITc-ATPase, ca2+ promoted the interaction between ATPase molecules, both in the native membrane and in detergent solutions.

关键词： calcium ion effect ATPase, ca 2+ - ATPase dimer Sarcoplasmic reticulum Brij-36T polyoxyethylene 10 lauryl ether c 12 E 8 octaethyleneglycol dodecyl ether c 12 E 9 polyoxyethylene 9 lauryl ether c 12 E 10 polyoxyethylene 10 lauryl ether DOc deoxycholate DTT dithiothreitol EFTA ethylene glycol bis( β -aminoethyl ether)- N , N , N ′, N ′-tetraacetic acid FITc fluorescein-5′-isothiocyanate HPLc high performance liquid chromatography Mops 4-morpholinepropanesulfonic acid SDS sodium dodecyl sulfate SR sarcoplasmic reticulum Tes N -[tris(hydroxymethyl)methyl″]-2-aminoethanesulfonic acid

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Priming effect and microbial diversity in ecosystem functioning and response to global change: a modeling approach using the SYMPHONY model

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GLOBAL cHANGE BIOLOGY 2014年第4期20卷 1174-1190页

作者： Perveen, Nazia Barot, Sebastien Alvarez, Gael Klumpp, Katja Martin, Raphael Rapaport, Alain Herfurth, Damien Louault, Frederique Fontaine, Sebastien INRA Unite Rech Ecosyst Prairial UR874 F-63039 Clermont Ferrand France Ecole Normale Super IRD UMR BIOEMCO Biogeochim & Ecol Milieux Continentau F-75230 Paris France Univ Clermont Ferrand 2 VetAgro Sup F-6300 Clermont Ferrand France SupAgro MISTEA UMR INRA F-34060 Montpellier France INRIA MODEMIC EPI INRA F-34060 Montpellier France

Integration of the priming effect (PE) in ecosystem models is crucial to better predict the consequences of global change on ecosystem carbon (c) dynamics and its feedbacks on climate. Over the last decade, many attempts have been made to model PE in soil. However, PE has not yet been incorporated into any ecosystem models. Here, we build plant/soil models to explore how PE and microbial diversity influence soil/plant interactions and ecosystem c and nitrogen (N) dynamics in response to global change (elevated cO2 and atmospheric N depositions). Our results show that plant persistence, soil organic matter (SOM) accumulation, and low N leaching in undisturbed ecosystems relies on a fine adjustment of microbial N mineralization to plant N uptake. This adjustment can be modeled in the SYMPHONY model by considering the destruction of SOM through PE, and the interactions between two microbial functional groups: SOM decomposers and SOM builders. After estimation of parameters, SYMPHONY provided realistic predictions on forage production, soil c storage and N leaching for a permanent grassland. consistent with recent observations, SYMPHONY predicted a cO2-induced modification of soil microbial communities leading to an intensification of SOM mineralization and a decrease in the soil c stock. SYMPHONY also indicated that atmospheric N deposition may promote SOM accumulation via changes in the structure and metabolic activities of microbial communities. collectively, these results suggest that the PE and functional role of microbial diversity may be incorporated in ecosystem models with a few additional parameters, improving accuracy of predictions.

关键词： bank functioning c sequestration c N coupling nutrient cycling nutrient mining plant soil interactions

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Different effects of grazing and nitrogen addition on ecosystem multifunctionality are driven by changes in plant resource stoichiometry in a typical steppe

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PLANT AND SOIL 2022年第1-2期481卷 179-194页

作者： Li, Lan He, Xiong Zhao Zhang, Xiumin Hu, Junqi Wang, Mengyuan Wang, Zhen Hou, Fujiang Lanzhou Univ Key Lab Grassland Livestock Ind Innovat State Key Lab Grassland Agroecosyst Coll Pastoral Agr Sci & TechnolMinist Agr & Rura Lanzhou 730020 Peoples R China Massey Univ Sch Agr & Environm Palmerston North New Zealand

Purpose Herbivore grazing and nitrogen (N) input may alter the multiple ecosystem functions (i.e., multifunctionality, hereafter) associated with carbon (c), N, and phosphorus (P) cycling. Most studies on variations in plant diversity, soil biotic or abiotic factors, and linkages to ecosystem functions have focused on grazing or N enrichment alone. Few studies have combined these two factors to explore the role of plant resource stoichiometry (c:N:P ratios) in ecosystem multifunctionality (EMF) control. Here, we evaluated the direct and indirect effects of stocking rate (0, 2.7, 5.3, and 8.7 sheep ha(- 1)) and N addition rate (0, 5, 10, and 20 g N m(- 2) yr(- 1)) on a range of ecosystem functions and EMF via changing plant diversity, soil pH and plant resource stoichiometry in a typical steppe on the Loess Plateau. Results We found that increasing stocking rate and interaction between grazing and N addition significantly decreased EMF, while increasing N addition rate significantly promoted EMF. Grazing decreased soil NH4+-N, soil NO3--N, aboveground biomass, and plant c, N, and P pools, but increased soil total N and P at 8.7 and 5.3 sheep ha(- 1), respectively. N addition increased soil NH4+-N, NO3--N, and total P. Plant aboveground biomass, and plant c, N, and P pools increased at the lower N addition rate (<= 5 g N m(- 2) yr(- 1)) under grazing. The structural equation models indicated that (1) EMF was driven by the direct effects of grazing and the indirect effects of grazing on plant resource stoichiometry and soil pH;(2) EMF increased with increasing N addition rates, but such positive response of EMF to increasing N addition rates was alleviated at high levels of plant resource stoichiometry and diversity;and (3) the indirect effects of plant diversity induced by grazing and N addition had moderate effects on EMF via the variations of plant resource stoichiometry. conclusions This study demonstrated grazing and N addition had contrasting effects on ecosystem

关键词： c N P stoichiometry Ecosystem multifunctionality N addition rate Plant diversity Stocking rate Soil abiotic properties

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INTERAcTION OF ASPERGILLUS-FUMIGATUS SPORES AND PULMONARY ALVEOLAR MAcROPHAGES OF RABBITS

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IMMUNOBIOLOGY 1984年第1期166卷 53-61页

作者： KURUP, VP MED COLL WISCONSIN DEPT MED ALLERGY IMMUNOL SECT MILWAUKEE WI 53226 USA

The in vitro and in vivo interaction of rabbit pulmonary alveolar macrophages (PAM) and A. fumigatus spores was studied. In vitro experiments showed that PAM from normal rabbits failed to appreciably kill A. fumigatus spores in 4 h, while A. flavus and A. niger spores were destroyed effectively. Prior opsonization of the spores with normal rabbit serum, rabbit anti-A. fumigatus serum, complement of lung lavage fluid has no profound enhancing effect on the phagocytosis or killing of the spores. Activated macrophages killed slightly more spores than normal macrophages. When A. fumigatus spores were injected intratracheally into rabbits, no dissemination to organs other than the lungs was detected during the 1st hour, while dissemination to the liver, spleen and kidneys was observed 1 h after the inoculation. Free spores in the bronchoalveolar washings and ingested spores in macrophages diminished in 4 h, while spores in the lung homogenate increased considerably.

关键词： ABPA allergic bronchopulmonary aspergillosis PAM pulmonary alveolar macrophage SP spores NS normal rabbit serum IS rabbit anti-A. fumigatus serum c complement LLF lung lavage fluid N-Ma normal macrophage A-Mo activated macrophage

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DIENcEPHALIc MEcHANISMS OF PAIN SENSATION

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BRAIN RESEARcH REVIEWS 1985年第3期9卷 217-296页

作者： ALBEFESSARD, D BERKLEY, KJ KRUGER, L RALSTON, HJ WILLIS, WD FLORIDA STATE UNIV DEPT PSYCHOL TALLAHASSEE FL 32306 USA UNIV CALIF SAN FRANCISCO SCH MED DEPT ANAT SAN FRANCISCO CA 94143 USA UNIV TEXAS MED BRANCH INST MARINE BIOMED DEPT PHYSIOL & BIOPHYS GALVESTON TX 77550 USA UNIV TEXAS MED BRANCH INST MARINE BIOMED DEPT ANAT GALVESTON TX 77550 USA UNIV PARIS 06 F-75230 PARIS 05 FRANCE INRA CTR NATL RECH ZOOTECH PHYSIOL NUTR LAB NEUROBIOL APPL GRP F-78350 JOUY EN JOSAS FRANCE UNIV CALIF LOS ANGELES CTR HLTH SCI BRAIN RES INST DEPT ANAT LOS ANGELES CA 90024 USA UNIV CALIF LOS ANGELES CTR HLTH SCI BRAIN RES INST DEPT ANESTHESIOL LOS ANGELES CA 90024 USA UNIV CALIF LOS ANGELES CTR HLTH SCI BRAIN RES INST AH MANSON LAB NEUROBIOL LOS ANGELES CA 90024 USA

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Alpha-Mangostin Alleviates the Short-term 6-Hydroxydopamine-Induced Neurotoxicity and Oxidative Damage in Rat cortical Slices and in caenorhabditis elegans

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NEUROTOXIcITY RESEARcH 2022年第2期40卷 573-584页

作者： Estrada-Valencia, Ruben Ester Hurtado-Diaz, Maria Rangel-Lopez, Edgar Retana-Marquez, Socorro Tunez, Isaac Tinkov, Alexey Karasu, cimen Ferrer, Beatriz Pedraza-chaverri, Jose Aschner, Michael Santamaria, Abel Inst Nacl Neurol & Neurocirug Lab Aminoacidos Excitadores Lab Neurofarmacol Mol & Nanotecnol Insurgentes Sur 3877 Mexico City 14269 DF Mexico Univ Nacl Autonoma Mexico Fac Ciencias Mexico City 04510 DF Mexico Univ Autonoma Metropolitana Dept Biol Reprod Campus Iztapalapa Mexico City 09340 DF Mexico Inst Invest Biomed Maimonides Cordoba IMIBIC Cordoba Spain Univ Cordoba Fac Med & Enfermeria Dept Bioquim & Biol Mol Cordoba Spain Red Espanola Excelencia Estimulac Cerebral REDEST Cordoba Spain IM Sechenov First Moscow State Med Univ Sechenov Univ Moscow Russia Gazi Univ Fac Med Dept Med Pharmacol Cellular Stress Response & Signal Transduct Res L Ankara Turkey Albert Einstein Coll Med Dept Mol Pharmacol Bronx NY 10461 USA Univ Nacl Autonoma Mexico Fac Quim Dept Biol Mexico City 04510 DF Mexico

The development, at the experimental level, of therapeutic strategies based on natural products to attenuate neurological alterations in degenerative disorders has gained attention. Antioxidant molecules exhibit both anti-inflammatory and neuroprotective properties. Alpha-mangostin (alpha-Man) is a natural xanthonoid isolated from the mangosteen tree with demonstrated antioxidant and cytoprotective properties. In this study, we investigated the antioxidant and protective properties of alpha-Man, both ex vivo and in vivo. We assessed the mitochondrial reductant capacity and oxidative damage to lipids in rat cortical slices, and several endpoints characteristic of physiological stress in the nematode, caenorhabditis elegans (c. elegans), upon exposure to the parkinsonian neurotoxin, 6-hydroxydopamine (6-OHDA). In rat cortical slices, alpha-Man (25 and 50 mu M) reduced the 6-OHDA (100 mu M)-induced oxidative damage to lipid levels, but failed to reverse loss in cell viability. In wild-type (N2) c. elegans, alpha-Man (5-100 mu M) protected against 6-OHDA (25 mM)-induced decrease in survival when administered either as pre- or post-treatment. Protective effects of alpha-Man were also observed on survival in the Vc1772 strain (skn-1 KO-) exposed to 6-OHDA, though the extent of the protection was lesser than in the wild-type N2 strain. However, alpha-Man (5-50 mu M) failed to attenuate the 6-OHDA-induced motor alterations in the N2 strain. The loss of lifespan induced by 6-OHDA in the N2 strain was fully reversed by high concentrations of alpha-Man. In addition, while 6-OHDA decreased the expression of glutathione S-transferase in the cL2166 c. elegans strain, alpha-Man preserved and stimulated the expression of this protein. alpha-Man (25 mu M) also prevented 6-OHDA-induced dopaminergic neurodegeneration in the BZ555 c. elegans strain. Altogether, our novel results suggest that alpha-Man affords partial protection against several, but not all, short-term toxic effects ind

关键词： Alpha-mangostin Antioxidant defense 6-Hydroxydopamine Neurotoxicity c elegans SKN-1

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