Search Results
Results 101 - 150 of 2994
1 2 3 4 5 6 7 8 9 10 >
Cao Yongqiang - - 2014
The high luminescent near infrared (NIR)--emitting CdTe nanocrystals (NCs) with 3-mercaptopropionic acid (MPA) as the stabilized molecules had been sucessfully fabricated by a facile and simple water-reflux method. By virtue of the characterizations for the as-prepared MPA-capped CdTe NCs, such as UV-Vis absorption, steady-state photoluminescence (PL), time-resolved PL spectra and ...
Shen Xiaobing - - 2014
This study reports on the use of electrospun polyvinyl alcohol (PVA) nanofiber mats loaded with prazosin hydrochloride (PRH) as a transdermal drug delivery system, investigating the morphology of electrospun PVA nanofibers, the in vitro release characteristics of the drug from the as-spun fibers, and the influence of permeation enhancer (water-resoluble ...
Samavati Alireza - - 2014
Controlled growth and characterization of germanium (Ge) and silicon (Si) nanostructure are the key issues for optoelectronic device fabrication. The role of post-annealing on the structural and optical properties of radio frequency (rf) magnetron sputtering grown of Ge and Si quantum dots (QDs) deposited on Si(100) substrate is studied. Atomic ...
Mohan P - - 2014
Pristine LiNiO2 and yttrium substituted LiY(x)Ni(1-x)O2 (0.00 < or = X < or = 0.20) cathode materials were synthesized by sol-gel technique using aqueous solutions of metal nitrates and tartaric acid as a chelating agent. Physical properties of synthesized materials were characterized by using X-ray diffraction analysis (XRD), Scanning electron ...
Mirzaei Sedigheh - - 2014
Different surface densities of gold nanoparticles (AuNPs) were deposited on (3-aminopropyl)-trimethoxysilane (APTMS)-modified indium tin oxide (ITO) electrode. The electrodes were then used in poly(3-hexylthiophene): phenyl-C61-butyric-acid-methylester (P3HT:PCBM) solar cells. Enhanced photo-conversion efficiency was observed from solar cells containing adsorbed AuNPs with surface density equals to 10 +/- 3 NPs/microm2. For higher ...
Johari Anima - - 2014
In present work, pure and copper (Cu) doped SnO2 nanowires have been synthesized by thermal evaporation process at ambient pressure. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) indicated the growth of wire-like pure and Cu-doped SnO2 nanostructures with their length of about 50 microm and 80 microm whereas ...
Kim D M - - 2014
We have investigated the detailed features of photoluminescence (PL) in vertically aligned ZnO nanotube (NT) arrays as a function of temperature, pumping power, and experimental geometries. In samples with different wall thickness (15 or 60 nm), the temperature-dependent PL energy followed the Varshni's formula whose fitting parameters were found to ...
Kang Chan-Mo - - 2014
The main issue of the organic rectifier, the key element in radio frequency identification tags, is to improve forward-bias current density of an organic diode in the rectifier, which increases the frequency response of the rectifier. One approach to achieve high current density is inserting a hole injection layer (HIL) ...
Algarni H - - 2014
The effect of gallium ion concentrations (0.5 and 2%) on the morphologies, structural and optical properties of Ga-doped ZnO nanostructures are presented. Ga-doped ZnO nanostructures were synthesized on silicon substrates by simple thermal evaporation process using metallic zinc and Ga powders in the presence of oxygen. Interestingly, it was observed ...
Arora Leena - - 2014
In the present study, a generic method for the modification of optical band gap of CdS nanostructures material over a wide spectral range due to Pb doping and formation of Cd(1-x)Pb(x)S nanoparticles and its size confinement is reported. The composite investigated in this study was grown by thermal decomposition of ...
Oh Sang Hoon - - 2014
Bulk-heterojunction organic solar cells (OSCs) based on poly(3-hexylthiophene) as a donor material and (6.6) phenyl-C61-butyric acid methyl ester as an acceptor material were investigated using a poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) buffer layer that was modulated with acetic acid. The 1.71 x 10(-1) omega x cm resistivity of the pristine PEDOT:PSS film ...
Fatehi D - - 2014
Diagnosis of glioblastoma multiform (GBM) with MRI lacks molecular information and requires a biopsy for pathologic confirmation. The EGFRvIII, is a constitutively active mutant of the EGF receptor, identified in a high percentage of brain cancers and associated with increased invasiveness and resistance, making it a good target to improve ...
Hu Wei-Chieh - - 2014
It is important to identify the dominant factors for governing the growth of carbon nanotubes (CNTs) and nano-onions (CNOs). A diffusion flame of a gas mixture of methane-ethylene was used as the carbon and heat sources and Ni as the catalyst for the synthesis of CNTs and CNOs. The effects ...
Wang Youde - - 2014
A new electron transfer dyad, covalently linked C70-corrole, was prepared via C70 and 10-(4-Formylaryl)-5,15-bis(pentafluorophenyl). The structures and the properties of the new material were investigated by HPLC, MALDI-TOF-MS, UV-Vis-NIR spectroscopy, NMR, fluorescence analysis and CV/DPV. The free-energy of C70-corrole calculated by employing the redox potentials and singlet excited-state energy suggested ...
Hu Fangyun - - 2014
The self-assembling behaviour of two kinds of 4-carboxyphenoxy phthalocyanines (Pc1 and Pc2) has been investigated by scanning tunneling microscope (STM). Pc1 and Pc2 are isomers with the same substituent at alpha- andbeta-position of the phthalocyanine core, respectively. Our STM results have shown that the Pc1 molecule fabricates into stable networks ...
Hadia N M A - - 2014
Zinc nitrate hexahydrate, Zn(NO3)2 x 6H2O was used as a precursor with urea NH2CONH2 to prepare hydrozincite Zn5(CO3)2(OH)6 powder using hydrothermal method for 8 h at 90 degrees C. Zinc oxide (ZnO) nanoparticles (NPs) were prepared by thermal annealing of hydrozincite powder at different annealing temperatures, i.e., 350, 550 750 ...
Lee Sang Heon - - 2014
The current-voltage characteristics and the mechanism of memorized magnetic effect of a BiSrCaCuO superconductor were studied to develop a superconductor device. An external magnetic field produced an out-put voltage across the superconducting sample which increased with increasing the applied magnetic flux. The out-put voltage was not completely disappeared after removal ...
Kim Yeong-Joon - - 2014
A new synthetic route for decorating carbon nanotubes (MWCNTs) with silver nanoparticles by proton beam irradiation at room temperature is presented. Pristine- and surface-modified MWCNTs were comparatively utilized for the preparation of MWCNT-Ag-nanoparticles nanohybrid. Silver nanoparticles on the surfaces of MWCNTs were produced in situ without any additional reducing reagents, ...
Sun Qing - - 2014
Monolayers and Langmuir-Blodgett (LB) films of pyridyldithio-functionalized multiwalled carbon nanotubes (pythio-MWNTs) conjugated with cytochrome c were investigated. Quartz crystal microbalance measurements revealed that monolayers of pythio-MWNTs could be deposited on the substrate surface with a surface density of about 270 ng/cm2. The as-prepared LB films of pythio-MWNTs could act as ...
Gal Yeong-Soon - - 2014
A new ionic conjugated polymer was prepared by the activated polymerization of 2-ethynylpyridine with the ring-opening of 1,3-propanesultone without any additional initiator or catalyst. This polymer was characterized by various instrumental methods to have conjugated polymer backbone system with pendant N-propylsulfonate functional groups. The photoluminescence spectrum of polymer showed that ...
Chen Weifan - - 2014
SnO2:Eu3+ nanorods have been successfully synthesized by annealing products from microwave-induced KCl-assisted solution combustion reaction, which uses tin (IV) chloride pentahydrate and europium nitrate as cationic source, ethyl glycol as fuel and ammonium nitrate as combustion-supporting agent. The structural and photoluminescent properties of SnO2:Eu3+ nanorods were investigated by high-resolution transmission ...
Zhang Xu - - 2014
NaX zeolites were prepared by hydrothermal synthesis under room-temperature conditions. Some influence parameters such as crystallization time, Al2O3/SiO2, Na2O/SiO2 and H2O/SiO2 molar ratios on the crystalline end products were studied, the products were characterized by XRD, SEM, TEM, particle size analysis and N2 adsorption-desorption techniques. The results indicated that although ...
Lee Chang-Shin - - 2014
Four peptides, C1 (spanning the helical segment of human neuropeptide Y from residue 15 to residue 29), C2 (spanning the helical segment of 21 to 31), C3 (the C-terminal fragment of neuropeptide Y involving residues 20 to 36) and P34-C3 (replacement of the glutamine with proline in position 34 of ...
Guo Lin - - 2014
A novel drug delivery system c(RGDyK)-modified Fe3O4 nanoparticles with high DOX load (R-DMP), which combines magnetic targeting, integrin alpha(v)beta3 targeting and high drug loading properties, was developed by chemical coupling both doxorubicin and peptide c(RGDyK) on the synthetic dual function magnetic nanoparticles (DMP) using a multi-hand cross-linker poly-L-glutamic acid. R-DMP ...
Dhakshnamoorthy M - - 2014
Nanofiber composites (Polyimide/f-SWCNT) of Pyromellitic dianhydride, 4,4'-Oxydianiline, and 4,4'-(4,4'-isopropylidene diphenyl-1,1'-diyl dioxy) dianiline (PMDA-ODA/IDDA) and surface-functionalized single walled carbon nanotubes (f-SWCNT) were made by electrospinning a solution of poly(amic acid) (PAA) containing 0-2 wt% f-SWCNT followed by thermal imidization. X-ray photoelectron spectroscopy spectra verified the oxidation of SWCNT surface after acid ...
Cho Shinho - - 2014
Copper nitride (Cu3N) thin films were deposited at 300 degrees C on glass substrates by reactive magnetron sputtering method with changing various nitrogen flow rates. The results showed that the nitrogen flow rate has a significant effect on the properties of the Cu3N thin films. XRD data exhibited that two ...
Ahmad Naushad - - 2014
This paper reports a large-scale synthesis of barium oxide nanorods (BaO-NRs) by simple solution method at a very low-temperature of - 60 degrees C. The as-grown BaO-NRs were characterized in terms of their morphological, structural, compositional, optical and thermal properties. The morphological characterizations of as-synthesized nanorods were done by scanning ...
Yonezawa Tetsu - - 2014
Copper (Cu) fine particles were prepared by room-temperature hydrazine reduction of Cu oxide microparticles. In this study, to reveal the formation process of metallic Cu homogeneous fine particles from cupric oxide (CuO) microparticles, hydrazine was added to a CuO slurry at room temperature. The morphological changes in the product during ...
Zhang Lipeng - - 2014
In this work, shape-controlled synthesis of zinc oxide (ZnO) microstructures were demonstrated using liquid-phase route utilizing zinc acetate hydrate as zinc ion precursor and ammonia as pH buffering agent and source for zinc-ammonia complexes. Glass substrate coated with indium tin oxide layer was used as the growth substrate. Zinc-ammonia complex ...
Kim Hyunsu - - 2014
V2O5-coated ZnO 1D nanostructures were prepared by using a two step process: thermal evaporation of a mixture of ZnO and graphite powders (ZnO:C = 1:1) in an oxidative atmosphere and sputter-deposition of V2O5. Scanning electron microscopy revealed that the nanostructures had a rod-like morphology with the thickness diminishing gradually from ...
Petrizzo Daniel A DA Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, Los Angeles, CA, 90095-1567, - - 2014
Rapid development of the CO2 'clumped-isotope' temperature proxy (Δ47 ) has involved both resource- and labor-intensive analytical methods. We report strategies for measuring Δ47 on a conventional mass spectrometer, with the usual CO2 set of three Faraday collectors while reducing the time devoted to standardization with temperature-equilibrated CO2 . We ...
Vijay Darshan D D National Centre for Mass Spectrometry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, - - 2014
Isomeric cationic amphiphiles differing only in the orientation of the linker group have been demonstrated to possess dramatically changed gene transfer efficacies. Studies aimed at understanding structure-stability correlations of such isomeric cationic amphiphiles at the molecular level are yet to be undertaken. Such studies may throw significant new insights into ...
Groenewold Gary S GS Idaho National Laboratory, 2351 North Boulevard, Idaho Falls, ID, 83415-2208, - - 2014
New approaches for forming anions are sought that have strong abundance and no isobaric overlap, attributes that are compatible with the measurement of isotope ratios. Fluoroanions are particularly attractive because fluorine is monoisotopic, and thus will not have overlapping isobars with the isotope of interest. Since many elements do not ...
Qi Peng P Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 HaiKe Rd, Pudong, 201203, Shanghai, - - 2014
Seeds of Vaccaria segetalis (Wang-Bu-Liu-Xing in Chinese) are mainly used in traditional Chinese medicine for the treatment of amenorrhea, breast infections, and edema. The study was designed to identify the components and metabolites of Wang-Bu-Liu-Xing. A novel methodology combining an adsorbent-separation strategy with analysis by liquid chromatography/quadrupole time-of-flight tandem mass ...
Tomlinson G G Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), CH-8903, Birmensdorf, - - 2014
The use of stable nitrogen (N) isotope ratios (δ(15) N values) in dendroecological studies is often preceded by an extraction procedure using organic solvents to remove mobile N compounds from tree-rings. Although these mobile N compounds may be capable of distorting potential environmental signals in the tree-ring δ(15) N values, ...
Lorenz Matthias M Organic and Biological Mass Spectrometry Group, Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6131, - - 2014
Laser ablation provides for the possibility of sampling a large variety of surfaces with high spatial resolution. This type of sampling when employed in conjunction with liquid capture followed by nanoelectrospray ionization provides the opportunity for sensitive and prolonged interrogation of samples by mass spectrometry as well as the ability ...
Ahn Insu I Korea Polar Research Institute, Incheon, 406-840, Korea; Department of Earth and Planetary Material Science, Tohoku University, Aramaki, Aoba, Sendai, Miyagi, 980-8578, - - 2014
Cryogenic trapping using molecular sieves is commonly used to collect O2 extracted from silicates for (17) O/(16) O and (18) O/(16) O analyses. However, gases which interfere with (17) O/(16) O analysis, notably NF3 , are also trapped and their removal is essential for accurate direct measurement of the (17) ...
El-Baba Tarick J TJ Department of Chemistry, Wayne State University, Detroit, MI, 48202, - - 2014
New inlet and vacuum ionization methods provide advantages of specificity, simplicity and speed for the analysis of synthetic polymers and polymer additives directly from surfaces such as fibers using mass spectrometry (MS) on different commercial mass spectrometers (Waters SYNAPT G2, Thermo LTQ Velos). We compare inlet ionization methods with the ...
Piper Thomas T German Sport University Cologne, Center for Preventive Doping Research - Institute of Biochemistry, Am Sportpark Müngersdorf 6, 50933, Köln, - - 2014
AICAR (5-aminoimidazole-4-carboxamide 1β-D-ribofuranoside) is prohibited in sport according to rules established by the World Anti-Doping Agency. Doping control laboratories identify samples where AICAR abuse is suspected by measuring its urinary concentration and comparing the observed level with naturally occurring concentrations. As the inter-individual variance of urinary AICAR concentrations is large, ...
Liao Debra D Department of Drug Metabolism and Pharmacokinetics, Takeda Pharmaceuticals International Co., 40 Landsdowne St., Cambridge, MA, 02139, - - 2014
Stepwise preparation of calibration standards and quality controls (QCs) is one of the most routine and laborious steps in bioanalysis. An alternative non-contact dispenser using low picoliter digitized dispensing technology is evaluated for its application in non-stepwise preparation of calibration curve and QCs in bioanalysis. Fluorescein was initially used to ...
Pangavhane Sachinkumar Dagurao SD Department of Chemistry (A14/107), Faculty of Science, Masaryk University, Kamenice 753/5, Bohunice, 625 00, Brno, Czech - - 2014
Rare earth-doped sulphide glasses in the Ga-Ge-Sb-S system present radiative emissions from the visible to the middle infrared range (mid-IR) range, which are of interest for a variety of applications including (bio)-chemical optical sensing, light detection, and military counter-measures. The aim of this work was to reveal structural motifs present ...
Su Lijuan L Department of Chemistry, University at Buffalo, State University of New York, Buffalo, NY, 14260, - - 2014
Monitoring the concentrations of pharmaceuticals and personal care products (PPCPs) in wastewater is an integral step toward understanding the fate of these contaminants in wastewater treatment plants (WWTPs). This paper aims to develop a method that allows for the simultaneous analysis of multiple classes of PPCPs that can be used ...
Rondeau David D Institut d'Electronique et de Télécommunication de Rennes (IETR UMR CNRS 6164), Université de Rennes 1, Campus de Beaulieu, 263 Avenue du General Leclerc, 35042, Rennes Cedex, France; Université de Bretagne Occidentale, Département de Chimie, 6 avenue le Gorgeu, 29238, Brest Cedex 03, - - 2014
The internal energy deposition in ions that cross the desolvation region of an electrospray ionization (ESI) source affects the mass spectra that are obtained using in-source collision-induced dissociation (CID) or in tandem mass spectrometry (MS/MS) mode. It is thus important to evaluate the internal energy distributions of the ions in ...
Hu Zhe-Yi ZY University of Tennessee Health Science Center, College of Pharmacy, Department of Clinical Pharmacy, Memphis, TN, 38163, - - 2014
Clopidogrel (CLO) is a prodrug used to prevent ischemic events in patients undergoing percutaneous coronary intervention or with myocardial infarction. A previous study found ethyl clopidogrel (ECLO) is formed by transesterification of CLO when incubated with alcohol in human liver microsomes. We hypothesize that ECLO will be subject to further ...
Gallagher Richard R Oncology iMed DMPK, AstraZeneca UK Ltd., Alderley Park, Macclesfield, Cheshire, SK10 4TG, - - 2014
Improvements in the design of low-flow highly sensitive chromatographic ion source interfaces allow the detection and characterisation of drugs and metabolites from smaller sample volumes. This in turn improves the ethical treatment of animals by reducing both the number of animals needed and the blood sampling volumes required. A new ...
Korobushkin Daniil I DI A. N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 33 Leninsky prospect, Moscow, 119071, - - 2014
Stable isotope analysis (SIA) is used widely for reconstructing trophic links of vertebrate and invertebrate animals. Soil macrofauna form a substantial food source for a range of predators including amphibians, reptiles, birds and mammals. SIA-based estimations of their trophic niches require knowledge on the full range of isotopic signatures of ...
Paine Martin R L MR ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, School of Chemistry, University of Wollongong, Wollongong, NSW, 2522, - - 2014
The worldwide generation of plastic electronic waste (e-waste) is reaching epic proportions. The presence of toxic brominated flame retardants (BFRs) within these materials limits their ability to be recycled, resulting in large amounts of e-waste reaching landfills. Liquid extraction surface analysis mass spectrometry (LESA-MS) employing a chip-based nanoelectrospray coupled to ...
Rome Benjamin N BN Program On Regulation, Therapeutics, And Law (PORTAL), Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital, 1620 Tremont St., Suite 3030, Boston, MA, 02120, USA, - - 2014
Since 1976, the US Food and Drug Administration (FDA) has used the premarket approval (PMA) process to approve high-risk medical devices, including implantable cardioverter defibrillators (ICDs), coronary stents, and artificial heart valves. The PMA process is widely viewed as a rigorous evaluation of device safety and effectiveness, though recent recalls-most ...
Link Mark S MS The Cardiac Arrhythmia Center, Tufts Medical Center, 800 Washington Avenue, Boston, MA, 02111, USA, - - 2014
Commotio cordis is increasing described and it is now clear that this phenomenon is an important cause of sudden cardiac death on the playing field. Victims are predominantly young, male, and struck in the left chest with a ball. An animal model has been developed and utilized to explore the ...
Montezano Augusto C AC Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, - - 2014
Vascular injury, characterized by endothelial dysfunction, structural remodelling, inflammation and fibrosis, plays an important role in cardiovascular diseases. Cellular processes underlying this include altered vascular smooth muscle cell (VSMC) growth/apoptosis, fibrosis, increased contractility and vascular calcification. Associated with these events is VSMC differentiation and phenotypic switching from a contractile to ...
1 2 3 4 5 6 7 8 9 10 >