bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nafion‐induced metal‐metal interactions in a platinum(II) terpyridyl acetylide complex: A luminescent sensor for detection of volatile organic compounds
Authors: Tong Qing‐Xiao , Li Xiao‐Hong , Wu Li‐Zhu , Yang Qing‐Zheng , Zhang Li‐Ping , Tung Chen‐Ho 
Published: September 2010

AbstractThe platinum(II) terpyridyl acetylide complex [Pt(terpy)(CCR)]ClO4 (terpy=2,2′ : 6′2″‐terpyridine, R=CH2CH2CH3) (1) was incorporated into Nafion membranes. At high loading the dry membranes exhibit intense photoluminescence with λmax at 707 nm from the 3MMLCT state. which was not observed in fluid solution. Upon exposure to the vapor of polar volatile organic compounds (VOC), this photoluminescence was significantly red‐shifed. This process was fully reversible when the VOC‐incorporated membrane was dried in air. The dramatic and reversible changes in the emission spectra made the Nafion‐supported complex as an interesting sensor candidate for polar VOC.
Synthesis and crystal structure of macrocyclic cavitand Cu‐curbit[5]uril and its supramolecular adduct with Cu(II)
Authors: Liu Si‐Min , Huang Zi‐Xiang , Wu Xiao‐Jun , Liang Feng , Wu Cheng‐Tai 
Published: September 2010

AbstractThe first supramolecular adduct (H3O)2[Cu(H2O)4](SO4)2·2(C30H30N20O10)·24(H2O) based on cucurbit[5]uril was synthesized and characterized by single crystal X‐ray diffraction analysis. In the adduct, copper ion is coordinated by four oxygen atoms from H2O. The latter links two cucurbit[5]uril molecules due to a complicated hydrogen bonding containing lattice water molecules.
Simultaneous separation and determination of four bioactive constituents in traditional chinese medicinal tablet Xinkeshu by HPLC‐DAD
Authors: He Jian‐Tao , Shi Zhi‐Hong , Yan Jin , Zhao Mei‐Ping , Chang Wen‐Bao 
Published: September 2010

AbstractA reversed‐phase high performance liquid chromatographic method for simultaneous determination of four bioactive constituents was established for the quality control of traditional Chinese medicinal tablet Xinkeshu. Danshensu, protocatechualdehyde, puerarin and daidzein were successfully separated on a Diamonsil C18 column (150×4.6 mm i.d., 5 μm) with a guard column (12.5×2.1 mm i.d., 5 μm) packed with the same material at 25 °C. The mobile phase was a mixture of acetonitrile and 0.02 mol/L potassium dihydrogen phosphate employing gradient elution at a flow rate of 0.8 mL/min. Detection was accomplished with a diode‐array detector and detection wavelength was set at 280 nm before 22 min, then it was varied to 250 nm. The four constituents were identified by comparing their retention time and W spectra in the range of 190–400 nm with those of authentic standards. The linear calibration ranges were 15.4–123.2, 3.11–25.22, 21.6–172.8, and 0.26–3.47 μg/mL for danshensu, protocatechualdehyde, puerarin and daidzein, respectively. The detection limits were 0.03, 0.04, 0.10, 0.03 μg/mL for danshensu, protocatechualdehyde, puerarin, and daidzein, respectively. The contents of these four bioactive constituents in Xinkeshu tablet were successfully determined by the proposed method.
Theoretical study on adsorption and diffusion of N atoms on Cu low‐index surface
Authors: Diao Zhao‐Yu , Zhang Xiao‐Ming , Wang Ze‐Xin , Han Ling‐Li 
Published: September 2010

AbstractThe adsorption and diffusion of N atoms on the three low‐index Cu planes were studied using 5‐parameter Morse potential (5‐MP) method, and the best theory‐experiment agreement was obtained. N atom of Cu(100) surface sit on the fourfold hollow site with the vertical height of 0.018 nm closely coplanar with the topmost copper layer, and the four CuN bond lengths are 0.182 nm and the fifth CuN distance is 0.199 nm. For Cu(111) system, the existence of aberrant Cu(100) reconstructed structure is approved at higher coverage, and at low coverage the structure is almost an ideal Cu(111) surface structure. With respect to Cu(110) system, the N atoms are adsorbed at LB and H3 sites, not at SB site. The diffusion passage and diffusion barrier of adsorbed N atoms were also studied.
Electrolytic fixation of CO2 by electrocarboxylation of rx on nanocrystalline TiO2‐Pt cathode
Authors: Chu Dao‐Bao , Li Xiao‐Hua , Liu Xin‐Yuan , Yao Wen‐Li 
Published: September 2010

AbstractElectrolytic fixation of CO2 was investigated by electrocarboxylation of organic halides (a), and four esters (I, II, III, IV) were obtained in moderate yields. Electrochemical reduction esterifications of RX in the presence of CO2 were carried out on nanocrystalline TiO2‐Pt electrode. The electrochemical behavior of RX in the presence of CO2 was investigated by the technique of cyclic voltammetry, and the probable reaction mechanism was proposed.
n‐dodecane hydroconversion over nickel supported on different mesoporous aluminosilicates
Authors: Fang Ke‐Gong , Ren Jie , Sun Yu‐Han 
Published: September 2010

AbstractSeveral 2.0 wt% nickel catalysts supported on nanometer bimodal mesoporous aluminosilicate (NBMAS), AlHMS and AlMCM‐41 were prepared by means of the wetness impregnation method. The characterization techniques such as Py‐FTIR and H2 chemisorption showed that the amount of Brönsted acid sites decreased in the order of Ni/AlHMS > Ni/AlMCM‐41> Ni/NBMAS, while the nickel dispersion differed a little. In the catalytic n‐dodecane hydroconversion, the highest conversion was obtained over Ni/NBMAS, and the lowest isomerization selectivity occurred over Ni/AIHMS. For the cracked products, the symmetrical carbon number distribution centered at C6 was obtained on the Ni/AlMCM‐41 catalyst due to the well balanced metall/acid functions, whereas the Ni/AlHMS and Ni/NBMAS catalysts led to more C3‐C5 and C1+C11 products, respectively.
DFT study of dimethylaluminum azide clusters: Structures, energies, frequencies and thermodynamic properties
Authors: Xia Qi‐Ying , Xiao He‐Ming , Ju Xue‐Hai , Gong Xue‐Dong 
Published: September 2010

AbstractDFT/B3LYP method with SDD basis set has been applied to the systems of (Me2AlN3). (n = 1–3). (Me2AlN3)2 was found to exhibit the planar Al2N2 ring structure. (Me2AlN3)3 involving a six‐membered Al3N3 ring was found to exhibit two minima with very similar binding energies (‐265.52 and −256.10 kJ*mol−1). Compared to the monomer, both the structural changes and charge & transfers for the clusters are large. Frequency calculations were carried out on each optimized structure and its JR spectra were discussed. Thermodynamic properties reveal that the dimer is the main component in the systems of the (Me2AlN3)n (n= 1–3).
Hartree‐Fock‐Roothaan calculations for ground states of some atoms using minimal basis sets of integer and noninteger n‐STOs
Authors: Sedat Gümüş , Özdoǧan Telhat 
Published: September 2010

AbstractHartree‐Fock‐Roothaan (HFR) calculations for ground states of some atoms, i.e. He, Be, Ne, Ar, and Kr have been performed using minimal basis sets of Slater type orbitals (STOs) with integer and noninteger principal quantum numbers (integer n‐STOs and noninteger n‐STOs). The obtained total energies for these atoms using minimal basis sets of integer n‐STOs are in good agreement with those in the previous literature. On the other hand, for the case of minimal basis sets of noninteger n‐STOs, although the calculated total energies of these atoms agree well with the results in Literature, some striking results have been obtained for atoms Ar and Kr. Our computational results for the energies of atoms Ar and Kr are slightly better than those in literature. by amount of 0.00222 and 0.000054 a.u., respectively. The improvement in the energies of atoms Ar and Kr may result from the efficient calculations of one‐center two‐electron integrals over noninteger n‐STOs. For some atomic ions in their ground state, HFR calculations have been carried out using minimal basis sets of noninteger n‐STOs. The obtained total energies for these atomic ions are substantially lower than those available in literature.
Synthesis, characterization, spectroscopic and electrochemical properties of new mono‐ and binuclear copper(I) complexes with substituted 2,2′‐bipyridine
Authors: Cao Qian‐Yong , Gan Xin , Fu Wen‐Fu 
Published: September 2010

AbstractThe mono‐ and binuclear Cu(I) complexes with substituted 2,2‐bipyridine and iodide ligands, [CuL2]BF4 (L= 4‐methoxycarbonyl‐6–(4‐methylphenyl)‐2,2′‐bipyridine (a), 6–(4‐hydroxymethylphenyl)‐2,2′‐bipyridine (b) and 6–(4methoxylphenyl)‐2,2′‐bipyridine (c)) and [Cu2(μ‐I)2L2] were prepared, and the crystal structures of the complexes were obtained from signal‐crystal X‐ray diffractional analysis. The spectroscopic properties of the complexes in dichloromethane are dominated by low energy MLCT bands from 360 to 650 nm. The electrochemical studies of mononuclear complexes reveal that the complexes have stable copper(I) state.
Rapid synthesis of lead oxide nanorods by one‐step solid‐state chemical reaction at room temperature
Authors: Cao Ya‐Li , Jia Dian‐Zeng , Liu Lang , Luo Jian‐Min 
Published: September 2010

AbstractA simple and facile method was reported to synthesize lead oxide nanorods. Nanorods of lead oxide were obtained directly from grinding solid metal salt and sodium hydroxide in agate mortar with the assistance of a suitable nonionic surfactant in only one step, which is different from the result of hydroxide in solution. The product has been characterized by XRD, TEM and SEM. The formation mechanism of rod‐like morphology is discussed and the surfactant plays an important soft‐template role in modifying the interface of solid‐state reaction and according process of rod‐formation.
Synthesis, crystal structure, properties and thermoanalysis of complexes of Cu(ll) and Ni(ll) with taurine‐5‐chlorosalicylaldelyde schiff base
Authors: Zhang Shu‐Hua , Jiang Yi‐Min , Zhou Zhong‐Yuan 
Published: September 2010

AbstractThe reactions of transition metal salts with taurine 5‐chlorosalicylaldelyde Schiff base gave two complexes [Ni(TCSSB)(H2O)3].H2O (1) and [Cu(TCSSB)(H2O)2]2[Cu(TCSSB)2].6H2O (2) (TCSSB=taurine‐5‐chlorosalicylaldelyde Schiff base), which were characterized by elemental analysis and X‐ray diffraction analysis. The complex 1 crystallized in monoclinic system with space group P2 1/c, and a=1.4816(2) nm, b=1.3953(2) nm, c= 0.7466(1) nm, β= 100.499(3)°, V=1.5176(4) nm3, Z=4, and an infinite 3‐D network structure was formed by hydrogen bonds among sulfo group, crystal water and coordinated water. Complex 2 crystallized in triclinic system with space group P1, with the cell parameters: a = 0.6413(2) nm, b= 1.4596(3) nm, c= 1.6188(4) nm, a= 102.473(5)°, β= 98.979(4)°, γ=101.739°, V=1.4165(6) nm3, Z=1. The coordination environment between Cu(1) and Cu(2) is different. Cu(1) is slightly distorted square pyramidal while Cu(2) is distorted square‐plane. The complex 1 is mononuclear while the complex 2 is made up of two coordinated subunits, namely [Cu(TCSSB)2] and [CU(TCSSB)(H2O)2]2. Besides that the TG‐DTG of the complex 1 was analyzed, the thermal decomposition reaction of the complex was studied under a non‐isothermal condition by TG‐DTG. The TG and DTG curves indicate that the complex was decomposed in three stages:

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Palladium‐catalyzed oxidation of dihydromyrcene to citronellal in supercritical carbon dioxide
Authors: Ran Xue‐Guang , Jiang Huan‐Feng , Zhu Xin‐Hai 
Published: September 2010

AbstractCitronellal was the major product of catalytic oxidation of dihydromyrcene with oxygen using the catalyst comprised of (MeCN)2PdClNO2 and CuCl2 in a tertiary alcohol in supercritical carbon dioxide. It was found that the chemoselectivity of the reaction and the yield of citronellal were greatly affected by the pressure of carbon dioxide, the reaction temperature and the molar ratio of Pd/Cu.
The first intramolecular charge transfer transition based on 2‐ureido‐4[1 H]‐pyrimidinone binding module
Authors: Zhao Chun‐Chang , Li Zhan‐Tng , Wu Li‐Zhu , Zhang Li‐Ping , Tung Chen‐Ho 
Published: September 2010

AbstractThe first intramolecular charge transfer transition based on 2‐ureido‐ 4[1H]‐pyrimidinone binding module was reported.
Clean SEA‐TROW experiments to map solvent exposed amides in large proteins
Authors: Lin Dong‐Hai 
Published: September 2010

AbstractIt is well known that the SEA‐TROSY experiment could alleviate some of the problems of resonance overlap in 15N/2H labeled proteins as it was designed to selectively map solvent exposed amide protons. However, SEA‐TROSY spectra may be contaminated with exchange‐relayed NOE contributions from fast exchanged hydroxyl or amine protons and contributions from longitudinal relaxation. Also, perdeuteration of the protein sample is a prerequisite for this experiment. In this communication, a modified version, clean SEA‐TROSY, was proposed to eliminate these artifacts and to allow the experiment to be applied to protonated or partially deuterated proteins and protein complexes.
1,3‐dipolar addition of methyl α‐diazoacetoacetate to enamines: A new synthetic route to 5‐amino‐4,5‐dihydrofurans
Authors: Huang Dan , Yan Ming , Zhao Wei‐Jie , Shen Qi 
Published: September 2010

AbstractThe reaction of methyl a‐diazoacetoacetate with enamines catalyzed by dirhodium and copper complexes underwent formal 1,3‐dipolar addition to give 5‐amino‐4,5‐dihydrofurans in moderate yields. The reaction was suggested to proceed via a nucleophilic addition of enamines to metal‐carbenes and a subsequent intramolecular cyclization of the resulting zwitterionic intermediates.
A new initiator cholesteryl chloroformate for cupper‐based atom transfer radical polymerization of methyl methacrylate
Authors: Cao Jian , Chu Juan , Zhang Ke‐Da 
Published: September 2010

AbstractThe polymerization of methyl methacrylate (MMA) was studied in detail by use of CuCl/L as a catalyst and cholesteryl chloroformate (CC) as an initiator. It was found that the atom transfer radical polymerization of MMA could proceed when L equals to a multidentate aliphatic amine ligand, N,N,N',N″,N″‐penta(methyl acrylate)diethylenetriamine (MA5‐DETA), and no polymerization was occurred while L=2,2′‐bipyridine and 1,10‐phenanthroline. The linear proportionality of the molecular weights to the conversions and straight lines observed in In[M]0/[M] versus time plots indicated that the present polymerization system bad the typical controlled polymerization characteristics.
Fabrication of zeolite A rods with irregular macropores by self‐assembly of zeolite A microcrystals using microwave‐assisted hydrothermal synthesis
Authors: Cheng Zhi‐Lin , Wan Hui‐Lin , Liu Zan 
Published: September 2010

AbstractZeolite A rods by self‐assembly of zeolite A microcrystal were successfully synthesized by microwave‐assisted hydrothermal synthesis. The average size of zeolite crystals consisting of self‐assembling materials was about 300 nm and the length of zeolite rods was in the range of 15–30 μm.
Synthesis of diphosphites fromtrans, trans‐spiro[4.4]nonane‐l,6‐diol and their application in rh‐catalyzed asymmetric hydroformylation of styrene
Authors: Xue Song , Jiang Yao‐Zhong 
Published: September 2010

AbstractChiral diphosphite ligands were prepared by the reaction of (1R,5S,6R)‐(trans, trans)‐spiro[4.4]nonane‐1,6‐diol with chlorophosphites. The rhodium(I) complexes containing these ligands were tested in the asymmetric hydroformylation of styrene and moderate enantioselectivity (up to 49%ee) was obtained. A pair of diastereomers 5a and 5b gave the opposite configuration of the product, which implies that the sense of enantioface selection is mainly dictated by the configuration of the terminal group on the ligand.
Treatment recommendations for primary extradural meningiomas
Authors: Mattox Austin , Hughes Betsy , Oleson James , Reardon David , McLendon Roger , Adamson Cory 
Published: September 2010

AbstractPrimary extradural meningiomas (PEMs) represent about 2% of all meningiomas and are often encountered by non‐neurosurgeons. These lesions typically present as enlarging, painless, benign masses that can be surgically cured. Imaging is critical for defining involvement of adjacent structures; however, diagnosis depends on classic histologic patterns. Treatment for benign PEMs (WHO I) consists of resection with wide margins, whereas adjuvant therapy after resection of atypical (WHO II) or malignant (WHO III) PEMs should be considered. By using the collective experience from our comprehensive cancer center, including neuro‐oncologists, neuroradiologists, and neurosurgeons, in addition to a complete literature review, the authors have established treatment guidelines not previously reported. This manuscript describes key features of these challenging tumors to aid in diagnosis, presents the largest published review of all reported PEMs (n = 163), and provides salient treatment guidelines to surgeons unfamiliar with these challenging tumors. Cancer 2011. © 2010 American Cancer Society.
Implementation of pigment‐dispersing factor‐immunoreactive neurons in a standardized atlas of the brain of the cockroach Leucophaea maderae
Authors: Wei Hongying , el Jundi Basil , Homberg Uwe , Stengl Monika 
Published: September 2010

AbstractThe cockroach Leucophaea maderae is an established model in circadian rhythm research. Its circadian clock is located in the accessory medulla of the brain. Pigment‐dispersing factor‐immunoreactive (PDF‐ir) neurons of the accessory medulla act as circadian pacemakers controlling locomotor activity rhythms. To characterize the neuronal network of the circadian system in L. maderae, the PDF‐ir neurons were implemented into a standardized three‐dimensional atlas of the cockroach brain. Serial confocal images from 20 wholemount brains were used for the construction of the atlas comprising 21 neuropils. Two different standardization protocols were employed: the iterative shape averaging (ISA) procedure using an affine transformation followed by iterative non‐rigid registrations, and the virtual insect brain (VIB) protocol employing local non‐rigid transformations after global and local rigid transformations. Quantitative analysis of the 20 brains revealed that volumes of the accessory medulla are directly correlated with the volumes of the medulla, the protocerebral bridge, and the upper division of the central body, suggesting functional connections among these neuropils. For a standardized reconstruction of the circadian pacemaker network, the ISA protocol was used to register PDF‐ir neurons in the standard cockroach brain. The registration revealed that two PDF‐ir arborization areas in the brain are highly interconnected with other PDF‐ir projection sites and appear to be contacted both by fibers in the posterior and the anterior optic commissures. The distances between PDF‐ir branching areas show specific numerical relationships that might be physiologically relevant for temporal encoding. J. Comp. Neurol. 518:4113–4133, 2010. © 2010 Wiley‐Liss, Inc.
Time‐resolved microscopy for imaging lanthanide luminescence in living cells
Authors: Gahlaut Nivriti , Miller Lawrence W. 
Published: September 2010

AbstractTime‐resolved luminescence (TRL) microscopy can image signals from lanthanide coordination complexes or other probes with long emission lifetimes, thereby eliminating short‐lifetime (<100 ns) autofluorescence background from biological specimens. However, lanthanide complexes emit far fewer photons per unit time than conventional fluorescent probes, making it difficult to rapidly acquire high quality images at probe concentrations that are relevant to live cell experiments. This article describes the development and characterization of a TRL microscope that employs a light‐emitting diode (LED, λem = 365 nm) for pulsed epi‐illumination and an intensified charge‐coupled device (ICCD) camera for gated, widefield detection. Europium chelate‐impregnated microspheres were used to evaluate instrument performance in terms of short‐lifetime fluorescence background rejection, photon collection efficiency, image contrast, and signal‐to‐noise ratio (SNR). About 200 nm microspheres were imaged within the time resolution limit of the ICCD (66.7 ms) with complete autofluorescence suppression. About 40 nm microspheres containing ∼400 chelate molecules were detected within ∼1‐s acquisition times. A luminescent terbium complex, Lumi4‐Tb®, was introduced into the cytoplasm of cultured cells at an estimated concentration of 300 nM by the method of osmotic lysis of pinocytic vesicles. Time‐resolved images of the living, terbium complex‐loaded cells were acquired within acquisition times as short as 333 ms, and the effects of increased exposure time and frame summing on image contrast and SNR were evaluated. The performance analyses show that TRL microscopy is sufficiently sensitive and precise to allow high‐resolution, quantitative imaging of lanthanide luminescence in living cells under physiologically relevant experimental conditions. © 2010 International Society for Advancement of Cytometry.
Fc block treatment, dead cells exclusion, and cell aggregates discrimination concur to prevent phenotypical artifacts in the analysis of subpopulations of tumor‐infiltrating CD11b+ myelomonocytic cells
Authors: Kuonen Francois , Touvrey Cedric , Laurent Julien , Ruegg Curzio 
Published: September 2010

AbstractIt is well established that cancer cells can recruit CD11b+ myeloid cells to promote tumor angiogenesis and tumor growth. Increasing interest has emerged on the identification of subpopulations of tumor‐infiltrating CD11b+ myeloid cells using flow cytometry techniques. In the literature, however, discrepancies exist on the phenotype of these cells (Coffelt et al., Am J Pathol 2010;176:1564–1576). Since flow cytometry analysis requires particular precautions for accurate sample preparation and trustable data acquisition, analysis, and interpretation, some discrepancies might be due to technical reasons rather than biological grounds. We used the syngenic orthotopic 4T1 mammary tumor model in immunocompetent BALB/c mice to analyze and compare the phenotype of CD11b+ myeloid cells isolated from peripheral blood and from tumors, using six‐color flow cytometry. We report here that the nonspecific antibody binding through Fc receptors, the presence of dead cells and cell doublets in tumor‐derived samples concur to generate artifacts in the phenotype of tumor‐infiltrating CD11b+ subpopulations. We show that the heterogeneity of tumor‐infiltrating CD11b+ subpopulations analyzed without particular precautions was greatly reduced upon Fc block treatment, dead cells, and cell doublets exclusion. Phenotyping of tumor‐infiltrating CD11b+ cells was particularly sensitive to these parameters compared to circulating CD11b+ cells. Taken together, our results identify Fc block treatment, dead cells, and cell doublets exclusion as simple but crucial steps for the proper analysis of tumor‐infiltrating CD11b+ cell populations. © 2010 International Society for Advancement of Cytometry