bluuebunny/crossref_metadata_2025_split huggingface dataset:
Individual and social determinants of winning bids in online auctions
Authors: Stern Barbara B. , Stafford Marla Royne 
Published: February 2006

Abstract

Online auctions have grown in popularity since the inception of eBay in 1995. Yet despite the phenomenal growth, little is understood about the individual and collective motivations of consumers that lead to higher bids and ultimately, higher profits. This research reframes auction theory in terms of consumer behavior theory and uses observational data to assess bidder‐generated behavior in response to seller‐generated decisions. Results suggest that an increased number of visual cues (pictures) influences bids placed early in the auction and that those early bids generate activity among other bidders, subsequently resulting in higher winning bids. In addition, our findings indicate that the starting price, as determined by the seller, also impacts the final winning bid. Research and seller implications are offered, as are future directions for research in studying this still new phenomenon.

Copyright © 2006 John Wiley & Sons, Ltd.
Enantioselective Addition of Phenylacetylene to Ketones Catalyzed by Titanium(IV) Complexes of N‐Sulfonylated β‐Amino Alcohols
Authors: Wang Shao‐Hua , Tu Yong‐Qiang , Chen Peng 
Published: February 2006

AbstractThe easily prepared and recoverable chiral N‐sulfonylated β‐amino alcohol 2 in combination with Ti(OPr‐i)4was found to be an effective chiral catalyst for the enantioselective addition of alkynylzinc to ketones, which gave the useful products, i.e. chiral tertiary propargyl alcohols, with the ee up to 92%.
Ellipsoid‐shaped Carbosilane Dendrimers Modified with p‐Nitroazobenzene Mesogens on the Periphery
Authors: Tang Xin‐De , Gao Long‐Cheng , Zhang Qi‐Zhen , Fan Xing‐He , Chen Xiao‐Fang , Zhou Qi‐Feng 
Published: February 2006

AbstractNovel carbosilane liquid crystalline dendrimers based on 1,6‐hexanediol were prepared. Using the precursors Gn‐Cl (n=1–3) with SiCl bonds on the periphery as dendritic scaffolds and 4‐[4‐(6‐hydroxyhexyloxy)phenylazo]‐nitrobenzene as mesogenic group, a series of carbosilane liquid crystalline dendrimers from the first to the third generation were synthesized. These carbosilane liquid crystalline dendrimers showed smectic phase.
Role of Nanosized Zirconia on the Properties of Cu/Ga2O3/ZrO2 Catalysts for Methanol Synthesis
Authors: Liu Xin‐Mei , Yan Zi‐Feng , Lu Gao‐Qing 
Published: February 2006

AbstractThe introduction of mesoporous nanosize zirconia to the catalyst for methanol synthesis dedicates the nanosized catalyst and mesoporous duplicated properties. The catalyst bears the larger surface area, larger mesoporous volume and more uniform diameter, more surface metal atoms and oxygen vacancies than the catalyst prepared with the conventional coprecipitation method. The modification of microstructure and electronic effect could result in the change of the reduced chemical state and decrease of reducuction temperature of copper, donating the higher activity and methanol selectivity to the catalyst. The results of methanol synthesis demonstrate that the Cu+ is the optimum active site. Also, the interaction between the copper and zirconia shows the synergistic effect to fulfil the methanol synthesis.
Thermochemical Properties, Thermal Behavior and Decomposition Mechanism of 1,1‐Diamino‐2,2‐dinitroethylene (DADE)
Authors: Gao Hong‐Xu , Zhao Feng‐Qi , Hu Rong‐Zu , Pan Qin , Wang Bo‐Zhou , Yang Xu‐Wu , Gao Yin , Gao Sheng‐Li 
Published: February 2006

AbstractThe constant‐volume combustion energy, ΔcU (DADE, s, 298.15 K), the thermal behavior, and kinetics and mechanism of the exothermic decomposition reaction of 1,1‐diamino‐2,2‐dinitroethylene (DADE) have been investigated by a precise rotating bomb calorimeter, TG‐DTG, DSC, rapid‐scan fourier transform infrared (RSFT‐IR) spectroscopy and T‐jump/FTIR, respectively. The value of ΔcH⊖m (DADE, s, 298.15 K) was determined as (−8518.09± 4.59) J·g−1. Its standard enthalpy of combustion, ΔcU (DADE, s, 298.15 K), and standard enthalpy of formation, ΔfH⊖m (DADE, s, 298.15 K) were calculated to be (−1254.00±0.68) and (−103.98±0.73) kJ·mol−1, respectively. The kinetic parameters (the apparent activation energy Ea and pre‐exponential factor A) of the first exothermic decomposition reaction in a temperature‐programmed mode obtained by Kissinger′s method and Ozawa′s method, were Ek=344.35 kJ·mol−1, Ak=1034.50 s−1 and Eo=335.32 kJ·mol−1, respectively. The critical temperatures of thermal explosion of DADE were 206.98 and 207.08 °C by different methods. Information was obtained on its thermolysis detected by RSFT‐IR and T‐jump/FTIR.
Microcalorimetric Study of Energy Metabolism of HSV‐2 and FMDV Infection Processes
Authors: Zhang Heng , Zheng Cong‐Yi , Li Jie , Gu Chao‐Jiang , Wang Cun‐Xin , Liu Yu‐Wen 
Published: February 2006

AbstractThe metabolic thermogenic power data of the HSV‐2 infected HeLa cells and the FMDV infected BHK‐21 cells were determined by LKB‐2277 bioactivity monitor. The aim of the study was to investigate the difference of the cell metabolism under the action of two different viruses and the effects of hyperthermia and drugs on it. The results illustrated that the metabolic thermogenic power of infected cells was larger than the uninfected ones and there was a significant difference between the metabolism heat released by the two types of infected cells. From the maximal thermal power and total metabolism heat, the infection process was observed to be thermosensitive and could be inhibited by interferon. Our experiments also revealed that 6 month storage of FMDV could attenuate its virulence and infectivity. The study shows that microcalorimetry is a potent tool to investigate the metabolism of virus infection process.
Low‐temperature Heat Capacity and Standard Molar Enthalpy of Formation of Potassium L‐Threonate Hydrate K(C4H7O5)·H2O
Authors: Wei Qing , Chen San‐Ping , Gao Sheng‐Li , Di You‐Ying , Tan Zhi‐Cheng , Shi Qi‐Zhen 
Published: February 2006

AbstractThe solid potassium L‐threonate hydrate, K(C4H7O5)·H2O, was synthesized by the reaction of L‐threonic acid with aqueous potassium hydrogen carbonate and characterized by means of chemical and elemental analyses, IR and TG‐DTG. Low‐temperature heat capacity of K(C4H7O5)·H2O has been precisely measured with a small sample precise automated adiabatic calorimeter over the temperature range from 78 to 395 K. An obvious process of the dehydration occurred in the temperature region of 364–382 K. The peak temperature of the dehydration of the compound has been observed to be (380.524±0.093) K by means of the heat capacity measurements. The molar enthalpy, ΔdHm, and molar entropy, ΔdSm, of the dehydration of K(C4H7O5)·H2O were calculated to be (19.655±0.012) kJ/mol and (51.618±0.051) J/(K·mol) by the analysis of the heat‐capacity curve. The experimental molar heat capacities of the solid from 78 to 362 K and from 382 to 395 K have been respectively fitted to two polynomial equations of heat capacities against the reduced temperatures by least square method. The constant‐volume energy of combustion of the compound, ΔcUm, has been determined to be (−1749.71±0.91) kJ·mol−1 by an RBC‐II precision rotary‐bomb combustion calorimeter at 298.15 K. The standard molar enthalpy of formation of the compound, ΔfH⊖m, has been calculated to be (−1292.56±1.06) kJ·mol−1 from the combination of the standard molar enthalpy of combustion of the compound with other auxiliary thermodynamic quantities.
Synthesis and Characterization of Complexes of Copper(II), Nickel(II) and Cobalt(II) with vic‐Dioximes Bearing N′‐p‐Aminobenzoyl Benzaldehyde Hydrazone
Authors: Gup Ramazan , Kirkan Bülent , Giziroğlu Emrah 
Published: February 2006

AbstractSix different arylhydrazone derivatives of p‐aminobenzoic hydrazide of vic‐dioximes were synthesized by reaction of chloroglyoxime and dichloroglyoxime with N′‐p‐aminobenzoyl benzaldehyde, 4‐hydroxybenzaldehyde and 4‐methoxybenzaldehyde hydrazones, respectively. Metal‐ligand (1:2) complexes of vic‐dioxime derivatives with Cu(II), Ni(II) and Co(II) were prepared from corresponding metal acetates. The ligands and their complexes were characterized on the basis of elemental analyses and spectral data. The complexing abilities of these new vic‐dioximes toward transition metals of Co(II), Cu(II), Ni(II), Zn(II), Cd(II), Mn(II) and Cr(III) were determined by solid‐liquid extraction studies.
Synthesis and Structural Characteristics of Two Novel Bicyclododecyl Derivatives
Authors: Wang Ming‐An , Tu Guang‐Zhong , Ma Zu‐Chao , Zhang Ning , Wang Dao‐Quan 
Published: February 2006

Abstract2‐(2′‐Oxo‐3′‐oximidocyclododecyl) cyclododecanone (1) and 2‐(1′‐hydroxylcyclododecyl) cyclododecanone (2) were synthesized and characterized. The conformation analysis was carried out based on the NMR, molecular mechanics calculation and X‐ray diffraction. The conformation of two cyclododecyl moieties of both1and2was found to be the [3333]‐2‐one or [3333] square conformation both in the crystal state and the solution. The dihedral angle between carbonyl and the oxime double bond of the ring B is 180° in the crystal of1. The protons or hydroxyl group of carbon atoms to link the two cyclododecyl moieties of1and2constitute dihedral angles of 174° in the crystal, and 175° in the solution, and the CC σ bond between two cyclododecyl moieties can not freely rotate in the solid state and the solution. In addition, compound2was the first example ofα‐corner‐anti‐monosubstituted cyclododecanone.
New Triphenylene Based Discotic Liquid Crystals with Mixed Tails: Molecular Symmetry and Wide Columnar Mesophase Range
Authors: Zhao Ke‐Qing , Wang Bi‐Qin , Hu Ping , Gao Cai‐Yan , Yuan Fu‐Jin , Li Hui‐Rong 
Published: February 2006

Abstract A series of new trialkoxytrialkanoyloxytriphenylene TP(OCnH2n+1)3(OCOCmH2m+1)3 (5a–5e) (n=m+1=4–8) discotic liquid crystals were prepared and their mesomorphic properties were investigated using differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). The symmetrical and shorter chain triphenylenes display higher melting points and clearing points, more highly ordered and stable columnar mesophase than the asymmetrical and longer chain triphenylenes respectively.
The First Total Synthesis of the (±)‐Palstatin
Authors: Feng Jian‐Peng , Wang Xiao‐Long , Cao Xiao‐Ping 
Published: February 2006

AbstractThe first total synthesis of (±)‐palstatin was achieved from commercially available 5‐bromovanallin and 2,4,6‐trihydroxyacetophenone. SeO2 promoted oxidative cyclization reaction and Ag2O catalyzed oxidative coupling reaction served as the key steps in the synthesis successfully.
Preparation, Crystal Structure and Theoretical Calculation of 4‐(4,6‐Dimethylpyrimidin‐2‐yl)‐3‐thio‐allophanic Acid Methyl Ester
Authors: Ren Ying‐Hui , Song Ji‐Rong , Huang Jie , Ma Hai‐Xia , Wang Hua‐Li , Hu Huai‐Ming , Wen Zhen‐Yi 
Published: February 2006

Abstract4‐(4,6‐Dimethylpyrimidin‐2‐yl)‐3‐thio‐allophanic acid methyl ester was synthesized with mixing 2‐amino‐4,6‐dimethylpyrimidine, potassium thiocyanate and methyl chloroformate in ethyl acetate. Single crystals suitable for X‐ray diffraction measurement were obtained by recrystallization from dimethylformamide at room temperature. The crystal belongs to monoclinic symmetry with space groupC2/mand crystal parameters ofa=1.7537(5) nm,b=0.6759(2) nm,c=1.1148(3) nm,β=118.557(4)°,V=1.1605(6) nm3,Z=4,Dc=1.375 g/cm3,μ=0.271 mm−1,F(000) =504, and 1519 [I>2σ(I)] observable independent reflections were used for the determination and refinement of the crystal structures with finalR1of 0.0372 andwR2of 0.0992. The theoretical investigation of the title compound was carried out with DFT‐B3LYP/6‐311G, HF/6‐311G and MP2/6‐311G methods, and the atomic net charges and the population were discussed.
Synthesis and Insecticidal Structure‐Activity Relationships of Novel Tonghaosu Analogs
Authors: Xiao Qin , Yin Biao‐Lin , Chen Li , Xu Han‐Hong , Hu Tai‐Shan , Wu Yu‐Lin 
Published: February 2006

AbstractTwenty‐one tonghaosu analogs were synthesized via hydroamination or selective reduction of the endocyclic double bond of the corresponding dienol spiroketals. Structures of all the new compounds were confirmed by 1H NMR, IR, MS, HREIMS or elemental analysis. Their antifeedant activity against large white butterfly (Pieris brassicae L) and larvicidal activity toward mosquito (Culex quinquefasciatus Say) were examined. Some of them exhibited antifeeding activities comparable to or stronger than tonghaosu Z‐1. Based on the activity data, the preliminary structure‐activity relationship was also discussed, which might be instructive for finding out lead compounds with better bioactivities in the future.
Electrochemical Noise Analysis and Electrochemical Impedance Spectroscopy for Pure Copper in Chloride Media
Authors: Nagiub Adham Mohamed 
Published: February 2006

AbstractThe corrosion behavior of pure copper electrode exposed to artificial seawater has been studied using electrochemical noise analysis (ENA) and electrochemical impedance spectroscopy (EIS). A diffusion process was observed for copper exposed to chloride media as indicated by the presence of a minimum phase angle over the lowest frequency range in the impedance plots. Analysis of electrochemical noise (EN) data has been collected both in time and frequency domains. Noise resistance Rn was obtained after analyzing EN data in the time domain. A good agreement was observed between Rn values and polarization resistance Rp values obtained from EIS analysis. Localization index Il was not found to provide information concerning corrosion mechanisms. Also skewness and kurtosis for both potential and current fluctuations did not show any mechanistic information. It was concluded that ENA could detect the corrosion rate for copper exposed to chloride media, but was not found to provide information about the corrosion mechanisms.
Interaction between Gold Nanoparticles and Bovine Serum Albumin or Sheep Antirabbit Immunoglobulin G
Authors: Ao Li‐Mei , Gao Feng , Pan Bi‐Feng , Cui Da‐Xiang , Gu Hong‐Chen 
Published: February 2006

AbstractThe interaction between gold nanoparticles and proteins such as bovine serum albumin and immunoglobulin G under the condition of different pH values was studied based on the measurement of zeta potential and fluorescence quenching of the proteins before and after proteins were bound with gold nanoparticles. Aggregations were found in gold colloid aqueous solution after addition of proteins by TEM characterization and UV‐Vis spectroscopy determination. The results showed that the values of zeta potential were quite different, the binding constant Kb and stoichiometry n were slightly increased with the increase of pH value. In conclusion, two factors could affect markedly the interaction between gold nanoparticles and proteins, that is, surface charge and the coordination effect between gold nanoparticles and indole group of the tryptophan residue of proteins.
Molecular Dynamics Studies on the Kinetics of Phase Changes of Nanoparticles: Properties, Structures, and Crystal Nucleation of Copper Nanoparticle Cu453
Authors: Song Hua‐Ju , Li Xiao‐Hua , Huang Jin‐Fan 
Published: February 2006

AbstractMolecular dynamics (MD) computer simulations have been carried out to study the structures, properties and crystal nucleation of nanoparticles with 453 Cu atoms. Structure information was analyzed from the MD simulations, while properties of nanoparticles of Cu453, such as melting point, freezing temperature, heat capacity and molar volumes, have been estimated. The face center cubic (FCC) phase and icosahedron (Ih) phase were observed during the quenching process, and nucleation rates of crystallization to FCC crystal of Cu453 at temperatures of 650, 700, 750, and 800 K were analyzed. Both classical nucleation theory (CNT) and diffuse interface theory (DIT) were used to interpret our observed nucleation rates. The free energy and diffuse interface thickness between the liquid and the FCC crystal phases were estimated by the CNT and DIT respectively, and the results show that the DIT does not work properly to the system.
Oxidant Promoted 1,3‐Dipolar Cycloaddition of Pyridinium Ylides to Chalcones for Preparation of 1‐Benzoyl‐2‐arylindolizines
Authors: Wang Bing‐Xiang , Liu Wei‐Wei , He Ting , Hu Hong‐Wen 
Published: February 2006

AbstractThe derivatives of 1‐benzoyl‐2‐arylindolizine were prepared in moderate yields of 41%–78% by CrO3/Et3N promoted 1,3‐dipolar cycloaddition of pyridinium N‐ylides and chalcones. Under the same conditions, CrO3/Et3N promoted 1,3‐dipolar cycloaddition of isoquinolinium N‐ylides and chalcones provided the corresponding 1‐benzoyl‐2‐arylpyrrolo[2,1‐a]isoquinolines in 45%–61% yields.
Retracted: Cisplatin‐induced antitumor activity is potentiated by the soy isoflavone genistein in BxPC‐3 pancreatic tumor xenografts
Authors: Mohammad Ramzi M. , Banerjee Sanjeev , Li Yiwei , Aboukameel Amro , Kucuk Omer , Sarkar Fazlul H. 
Published: February 2006

AbstractBACKGROUNDThe activation of nuclear factor κB (NF‐κB) contributes to drug resistance in pancreatic carcinoma. The authors previously showed that the soy isoflavone genistein down‐regulates the activation of NF‐κB in many carcinoma cell lines in vitro. In the current study, they focused their investigation on testing whether the inactivation of NF‐κB by genistein could enhance cisplatin‐induced cell growth inhibition and apoptosis in BxPC‐3 cells in vitro and antitumor activity of cisplatin in vivo.METHODSBxPC‐3 cells were preexposed to 25 μM genistein for 24 hours and then exposed to cisplatin (0.5 μM) for an additional 72 hours. A cell growth inhibition assay, an apoptosis assay, and an NF‐κB electrophoretic mobility shift assay were conducted. For the in vivo study, a xenograft model of BxPC‐3 cells in severe combined immunodeficient mice was used. Genistein was given at a dose of 800 μg/kg orally for 5 days, cisplatin was given at a dose of 9 mg/kg as an intraperitoneal bolus, and another group of mice received both cisplatin and genistein (given on Day 1 concurrently followed by genistein for 4 days).RESULTSThe combination of 25 μM genistein with 0.5 μM cisplatin resulted in significantly greater growth inhibition (P < 0.01) and more apoptosis in BxPC‐3 cells compared with either agent alone. Preexposure of BxPC‐3 cells to genistein abrogated cisplatin‐induced activation of NF‐κB, which appeared to be consistent with the authors' hypothesis. The authors also demonstrated for the first time that the in vivo effect of genistein enhanced the antitumor activity of cisplatin. The tumor weight for the control, genistein, cisplatin, and combined genistein and cisplatin mice was 940 mg, 762 mg, 261 mg, and 108 mg, respectively. Most important, for the first time, the authors observed that the DNA‐binding activity of NF‐κB was inactivated in genistein‐treated animal tumors, whereas cisplatin significantly induced NF‐κB DNA binding activity, and this was completely abrogated in genistein‐pretreated tumors that were exposed to cisplatin, consistent with the in vitro data.CONCLUSIONSOverall, the current results were consistent with the authors' hypothesis and suggested that pretreatment of pancreatic carcinoma cells with genistein down‐regulates NF‐κB activity and contributes toward enhancing the apoptosis‐inducing effect of cisplatin, leading to greater antitumor activity in vivo. Cancer 2006. © 2006 American Cancer Society.
Racial disparity and socioeconomic status in association with survival in older men with local/regional stage prostate carcinoma
Authors: Du Xianglin L. , Fang Shenying , Coker Ann L. , Sanderson Maureen , Aragaki Corrine , Cormier Janice N. , Xing Yan , Gor Beverly J. , Chan Wenyaw 
Published: February 2006

AbstractBACKGROUNDFew studies have examined the outcomes for Hispanic men with prostate carcinoma and incorporated socioeconomic factors in association with race/ethnicity in affecting survival, adjusting for factors on cancer stage, grade, comorbidity, and treatment.METHODSWe studied a population‐based cohort of 61,228 men diagnosed with local or regional stage prostate carcinoma at age 65 years or older between 1992 and 1999 in the 11 SEER (Surveillance, Epidemiology, and End Results) areas, identified from the SEER‐Medicare linked data with up to 11 years of followup.RESULTSLow socioeconomic status was significantly associated with decreasing survival in all men with prostate carcinoma. Those living in the community with the lowest quartile of socioeconomic status were 31% more likely to die than those living in the highest quartile (hazard ratio [HR] of all‐cause mortality: 1.31; 95% confidence interval [CI]: 1.25–1.36) after adjustment for patient age, comorbidity, Gleason score, and treatment. The HR remained almost unchanged after controlling for race/ethnicity (HR: 1.32; 95% CI: 1.26–1.38). Compared with Caucasians, the risk of mortality in African American men was marginally significantly higher (HR: 1.06; 95% CI: 1.01–1.11) after controlling for education, and no longer significant after adjusting for poverty, income, or composite socioeconomic variable; the HR was lower for Hispanic men (HR: 0.80; 95% CI: 0.72–0.89) after adjustment for education and other socioeconomic variables.CONCLUSIONRacial disparity in survival among men with local or regional prostate carcinoma was largely explained by socioeconomic status and other factors. Lower socioeconomic status appeared to be one of the major barriers to achieving comparable outcomes for men with prostate carcinoma. Cancer 2006. © 2006 American Cancer Society.