bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis, Characterization, and Thermodynamic Study of the Solid State Coordination Compound Cu(Nic)2·H2O(s)
Authors: DI You‐Ying , KONG Yu‐Xia , WANG Qing‐Chun , YANG Wei‐Wei , TAN Zhi‐Cheng 
Published: October 2008

AbstractA novel compound–monohydrated cupric nicotinate was synthesized by the method of room temperature solid phase reaction and a ball grinder. FTIR, chemical and elemental analyses and X‐ray powder diffraction techniques were applied to characterize the structure and composition of the complex. Low‐temperature heat capacities of the solid coordination compound have been measured by a precision automated adiabatic calorimeter over the temperature range from 78 to 400 K. A melting process occurred in the temperature range of 326–346 K in the heat capacity curve, and the melting point, molar enthalpy and entropy of the fusion were determined to be Tfus= (341.290±0.873) K, ΔfusHm= (13.582±0.012) kJ·mol−1, ΔfusSm= (39.797±0.067) J·K−1·mol−1. The experimental values of the molar heat capacities in the temperature regions of 78–326 K and 346–400 K were respectively fitted to two polynomial equations. The polynomially fitted values of the molar heat capacities and fundamental thermodynamic functions of the sample relative to the standard reference temperature 298.15 K were calculated and tabulated at an interval of 5 K.
Nonlinear Oxidation of Thiourea in an Unbuffered Medium
Authors: DU Yan‐Ru , WANG Shun , LIN Juan‐Juan , HUANG Shao‐Ming , ZHOU Huan 
Published: October 2008

AbstractThe reaction between periodate and thiourea has been studied in an unbuffered medium. A variety of interesting dynamical behavior including variable stoichiometries, characteristic "clock reaction" and oligooscillations or single peak oscillations in pH, the concentrations of both iodide and iodine were found in a closed reactor. When studied in an open reactor, the above reaction system displays fascinating damped oscillations and bistability in an unbuffered aqueous solution. A 12‐step simplified mechanism has also been proposed here. Our investigation illustrates that it is critical to include a rapid H+‐mediated preequilibrium step in the suggested mechanism. The modified mechanism gives a better agreement between the calculated results and experimental observations.
Prediction and Evaluation of the Piperonylidene Analogue of PBN by DFT Calculations & NBT Reduction Mediated Spectral Assay
Authors: JI Yi‐Qiong , WANG Zhao‐Yi , WANG Lan‐Fen , LIU Ke‐Jian , LIU Yang 
Published: October 2008

AbstractTwo linear spin traps,α‐piperonyl‐N‐tert‐butylnitrone (PiBN) and its phosphoryl analogueN‐(α‐ piperonylidene)‐1‐diethoxyphosphoryl‐1‐methylethylamineN‐oxide (PiPN), have been first synthesized and structurally characterized. To improve the limitation in evaluating the kinetics of O2−·‐spin trapping in the aqueous solution, a nitroblue tetrazolium (NBT)‐mediated spectral assay has been first fulfilled and examined in this work. On the other hand, to simplify the theoretical prediction on the kinetics, a density functional theory (DFT) LUMO calculation at the B3LYP/6‐311+G(d,p)//B3LYP/6‐31G(d) level has been comparatively performed. All the results, when combined with calculating their optimized spin adducts, reveal that an introduction of the phosphoryl group not only can significantly stabilize its superoxide spin adducts, but increases the rate constant for the O2−·‐spin trapping as well.
Influence of the Mixing State of tert‐Butyl Alcohol‐water Mixtures on the Conformation of Bovine Serum Albumin
Authors: MA Lin , WANG Xu , XU Li , HE Wei‐Ren , WEI Zhi‐Qiang , LIN Rui‐Sen 
Published: October 2008

AbstractThe hydrodynamic radii of bovine serum albumin (BSA) in TBA‐water mixtures were determined by dynamic light scattering measurements and utilized to investigate the conformational change of BSA in TBA‐water mixtures, together with the analysis of the fluorescence spectra and UV‐vis absorption spectra of BSA. Meanwhile, static light scattering measurements were used to probe the mixing state of the binary mixtures of TBA‐water and the ternary mixtures of BSA‐TBA‐water and its influence on the conformation of the protein. A close relationship between the mixing state of TBA‐water mixtures and the conformation of BSA was observed. The mixing state of TBA‐water mixture at a low concentration was characterized by the clathrate hydrate of TBA caged by water molecules and it was found that hydrophobic binding of TBA to nonpolar groups of BSA in general destabilized the native structure of the protein, however, addition of a small amount of TBA attenuated the hydrophobic interactions among nonpolar groups of the protein and promoted a more ordered conformation. The results clearly showed that clustering of TBA at a high concentration reduced the effectiveness on destabilization of the compact conformation of proteins.
Influences of Temperature and pH Value on the Corrosion Behaviors of X80 Pipeline Steel in Carbonate/Bicarbonate Buffer Solution
Authors: LI Jin‐Bo , ZUO Jian‐E 
Published: October 2008

AbstractThe joint effect of temperature and pH value on the corrosion behavior of X80 steel in carbonate/bicarbonate buffer solution was detected by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Mott‐Schottky analysis. The results show that an unstable corrosion film will be formed on the X80 steel surface in low pH value solutions, and a better protective corrosion film can be formed on the X80 steel surface in high pH value solutions. On the whole, the corrosion film resistance and transfer resistance increase with the increment of pH value, and decrease with increase of solution temperature, which indicates that the protective effect of the corrosion film on X80 steel is enhanced with increasing pH value and decreasing the solution temperature. The corrosion film formed on X80 steel surface in carbonate/bicarbonate buffer solution has an n‐type semi‐conductive character, and the donor density decreases with increasing the pH value, and increases with increasing the solution temperature. The flat‐band potential and pH value have a linear relationship with a positive slope.
Nanodiamonds Used as a Platform for Studying Noncovalent Interaction by MALDI‐MS
Authors: KONG Xiang‐Lei 
Published: October 2008

AbstractAs a new, fast and easy‐preformed method, nanodiamond has been used to study noncovalent interaction by MALDI‐MS. The diamonds covered with "bait analyte" were added into the solution of "fish analyte", and then separated with nanodiamonds by centrifugation and washed by water for final MALDI‐MS analysis. At the same time, mass spectrum of supernatant can also provide useful information by comparison with that of original solution without treatment by diamonds. This platform can be used to study inter‐molecular noncovalent interaction and can further find its application to selectively enhanced MALDI‐MS analysis, as the example of PL‐coated nanodiamonds used in mass analysis of phosphopeptides.
Synthesis, Crystal Structure and Fluorescence Property of a Five‐ and Six‐coordinated Trinuclear Zinc(II) Complex: {[ZnL(OAc)]2Zn}·CH3COCH3
Authors: DONG Wen‐Kui , ZHANG Yan‐Ping , ZHAO Chun‐Yu , TANG Xiao‐Lu , LÜ Zhong‐Wu , ZOU Zheng 
Published: October 2008

AbstractA novel linear trinuclear zinc(II) complex, {[ZnL(OAc)]2Zn}·CH3COCH3 (H2L: ethylenedioxybis(5‐bromo‐2‐ hydroxybenzylideneamino)), has been synthesized and structurally characterized. X‐ray crystal structure of the complex reveals that three zinc(II) ions are coordinated by two tetradentate L2− units and two acetate ions acting as bridging groups. The coordination geometry around the terminal Zn(1) or Zn(1)#1 atom approaches a distorted square pyramid. The coordination sphere of the central Zn(2) atom constitutes a slightly distorted octahedral geometry. The blue‐green emission from the zinc(II) complex can be observed, where the maximum emission wavelength is at 464 nm.
Solid Phase Extraction of Thallium(III) on Micro Crystalline Naphthalene Modified with N,N′‐Bis(3‐methylsalicylidene)‐ortho‐phenylenediamine and Determination by Spectrophotometry
Authors: MOGHIMI Ali 
Published: October 2008

Abstract A novel, simple, sensitive and effective method has been developed for preconcentration of thallium on N,N′‐bis(3‐methylsalicylidene)‐ortho‐phenylenediamine (MSOPD) adsorbent in a pH range 5.0–10.0, prior to its spectrophotometric determination, based on the oxidation of bromopyrogallol red at λ=520 nm. This method makes it possible to quantitize thallium in a range of 3.6×10−9 to 2.0×10−5 mol/L, with a detection limit (S/N=3) of 1.42×10−9 mol/L. This procedure has been successfully applied to determine the ultra trace levels of thallium in the environmental samples, free from the interference of some diverse ions. The precision, expressed as relative standard deviation of three measurements, is better than 2.9%.
Formation of Two‐dimensional Metal‐water Framework Containing (H2O)20 Cluster
Authors: SUN Ya‐Guang , DING Fu , GU Xiao‐Fu , ZHANG Wan‐Zhong , WEI De‐Zhou , GAO En‐Jun 
Published: October 2008

Abstract[Cd(phen)2(male)(H2O)]·9.5H2O (1) has been synthesized by the reaction of Cd(NO3)2 with phen and male (phen=1,10‐phenanthroline, H2male=maleic acid) in a mixture solvent of ethanol and distilled water. The complex was characterized by elemental analysis, infrared spectrum and thermal gravimetric analyses. The crystal structure was determined by X‐ray single‐crystal diffraction. In 1, a novel 1D water chain containing water (H2O)20 cluster was formed. Further hydrogen bonding interaction between the water chain and [Cd(phen)2(male)(H2O)] constructs a unique metal‐water 2D framework.
An Analysis Method of Trace Carboxylate Surfactant in Oilfield Produced Water
Authors: MENG Ling‐Wei , KANG Wan‐Li , WANG Ying , LIU Shu‐Ren , ZHANG Hong‐Yan 
Published: October 2008

AbstractChemical agent detection in the oilfield produced liquid plays a key role in the dynamic evaluation during ASP (alkali/surfactant/polymer) flooding. A new method was proposed for analysis of trace carboxylate surfactant with the UV spectrophotometer determination. This method is simple, accurate and rapid with a wide linear range. The method recovery is in the range of 94.4%–103.1%, and the relative standard deviation is only 1.38%. In considering the actual situation of oil production, the impact of alkali, polymer, crude oil and other interfering factors on the determination was explored, and the results were very satisfying.
Enhanced Ionization of Phosphopeptide Using Ammonium Phosphate as Matrix Additive by MALDI‐MS
Authors: ZHANG Ying , LU Hao‐Jie , YANG Peng‐Yuan 
Published: October 2008

AbstractA new method based upon adding ammonium phosphate as a matrix additive to enhance the ionization efficiency of phosphopeptide in matrix‐assisted laser desorption/ionization mass spectrometry (MALDI‐MS) was described. Furthermore, influences of different phosphate salts at various concentrations on the ionization efficiency of phosphopeptide were investigated systematically, finding that the signal intensity for phosphopeptide 48FQ[pS]EEQQQTEDELQDK63 digested from β‐casein were 5 to 8 times increased in an optimized condition with 10 mmol/L ammonium monobasic phosphate or 3 to 4 times increased with 10 mmol/L ammonium dibasic phosphate as additive to matrix 2,5‐dihydroxybenzoic acid, respectively. Compared with the most optimized matrix system that was currently reported for special ionization of phosphopeptides, the signal intensity of this phosphopeptide was also enhanced by twice when introducing 5 mmol/L ammonium dibasic phosphate into matrix 2,4,6‐trihydroxyacetophenone. In addition, the mechanism was also discussed, assuming that the cooperation function of ammonium cation and phosphate anion was of great importance in enhancing the ionization efficiency of phosphopeptide in MALDI‐MS.
Studies on the Reactions of Fluoroalkylazides with Electron‐deficient Alkenes
Authors: SUN Qing‐Rui , CHEN Zi‐Xian , LI Shan , WU Yong‐Ming , TIAN Wei‐Sheng 
Published: October 2008

AbstractThe 1,3‐dipolar cycloaddition of fluoroalkylazides with electron deficient olefins was studied. A series of fluoroalkylated triazoline and pyrazolines were synthesized by this method. A ring opening and diazo intermediate mechanism was proposed.
A Novel Synthesis of Alkylamino Substituted Methylenediphosphonates Using Bis(trichloromethyl) Carbonate and RCONR1R2
Authors: YU Chuan‐Ming , WANG Bo , CHEN Zhi‐Wei 
Published: October 2008

AbstractAn efficient, economical and easy method for the synthesis of dimethylaminomethylenediphosphonates using bis(trichloromethyl) carbonate and RCONR1R2 has been developed, which proceeded under relatively mild conditions.
Organocatalytic Direct Asymmetric Mannich Reactions of Hydroxyacetone by (2S,5S)‐Pyrrolidine‐2,5‐dicarboxylic Acid
Authors: GU Qing , GONG Jing‐Jing , FENG Jin , WU Xin‐Yan , ZHOU Qi‐Lin 
Published: October 2008

AbstractThe direct one‐pot three‐component asymmetric Mannich reactions of hydroxyacetone with anilines and benzaldehydes in the presence of (2S,5S)‐pyrrolidine‐2,5‐dicarboxylic acid afforded syn‐1,2‐amino alcohols in good‐to‐excellent yields (64% –95%) and up to 96% ee.
Dynamic Assembly Inclusion Complexes of Tweezer‐type Bis(zinc porphyrin) with 5,15‐Di(4‐pyridyl)porphyrin Derivatives
Authors: ZHOU Zai‐Chun , YANG Yi , ZHU Yi‐Zhou , ZHENG Jian‐Yu 
Published: October 2008

AbstractDynamic assembly inclusion complexes of tweezer‐type bis(zinc porphyrin) (1) with di(4‐pyridyl)porphyrin derivatives have been designed and constructed. The complexes are induced by Zn‐N coordination, and the weak binding allows the large‐size di(4‐pyridyl)porphyrin guests in random rotation. Dynamic characteristics of these assemblies, such as ligand exchange and dynamic fluorescence quenching, have been investigated by 1H NMR, UV‐Vis and fluorescence spectra. The stability of such assembly has pronounced dependence on the size‐matching effect and thermal effect.
Electrochemical Polymerization of Carbazole in Acetic Acid Containing Boron Trifluoride Diethyl Etherate
Authors: MIAO Hua‐Ming , ZHANG Hong‐Lin , XU Jing‐Kun , FAN Chang‐Li , DONG Bin , ZENG Li‐Qiang , ZHAO Feng 
Published: October 2008

AbstractHigh‐quality polycarbazole (PCz) films with an electrical conductivity of 10−2 S·cm−1 were synthesized electrochemically by direct anodic oxidation of carbazole in a novel mixed electrolyte of acetic acid containing 26% boron trifluoride diethyl etherate (BTDE) and 5% poly(ethylene glycol) with molar mass of 400 (by volume). The oxidation potential of carbazole in this medium was measured to be only 0.89 V vs. a saturated calomel electrode (SCE), which was much lower than that determined in acetonitrile containing 0.1 mol·L−1 Bu4NBF4 (1.36 V vs. SCE). PCz films obtained from this medium showed good electrochemical behavior, good thermal stability, and were partly soluble in strong polar organic solvents such as dimethyl sulfoxide and tetrahydrofuran. The fluorescence spectra implied that PCz obtained from this medium was a good blue‐light emitter. FT‐IR, 1H NMR and theoretical studies showed that the polymerization of carbazole mainly occurred at the 3,6‐positions. To the best of our knowledge, this is the first report on the electrosyntheses of conducting polymers in mixed electrolyte of acetic acid and BTDE.
Risk of cholecystitis in patients with cancer
Authors: Thomsen Reimar W. , Thomsen Henrik F. , Nørgaard Mette , Cetin Karynsa , McLaughlin Joseph K. , Tarone Robert E. , Fryzek Jon P. , Sørensen Henrik T. 
Published: October 2008

AbstractBACKGROUND.To the authors' knowledge, little information is available regarding the incidence of cholecystitis among patients with cancer.METHODS.The authors conducted a population‐based historical cohort study of 51,228 patients with incident cancer, identified in medical databases of western Denmark between 1995 and 2003. A general population comparison cohort of 512,280 persons was assembled using the Danish Civil Registration System. The occurrence of cholecystitis in the 2 groups was determined by linkage to the regional Hospital Discharge Registry.RESULTS.In all, 230 incident diagnoses of cholecystitis were identified in the cancer cohort during 130,185 person‐years (median follow‐up time: 1.6 years), corresponding to an incidence rate of 1.8 of 1000 person‐years. After adjustment for confounders, the relative risk (RR) for cholecystitis among cancer patients compared with the general population cohort was 1.38 (95% confidence interval [95% CI], 1.20‐1.58). Overall, the RR for cholecystitis was doubled during the first 6 months after cancer diagnosis (RR = 1.95; 95% CI, 1.50‐2.54), after which the RR declined but remained greater than 1 throughout the rest of the follow‐up period (RR = 1.23; 95% CI, 1.05‐1.45). Cancer patients between the ages of 51 and 70 years had the highest risk increase for cholecystitis compared with other age groups. During the first 6 months after a cancer diagnosis, pancreatic cancers (12 cholecystitis events; RR = 9.44 [95% CI, 5.18‐17.18]) and colorectal cancers (10 cholecystitis events; RR = 4.98 [95% CI, 2.65‐9.34]) were found to be associated with the greatest cholecystitis risk increase compared with other tumor types. After 6 months, most cancers were associated with a relatively small increased risk, although there was an RR of 4.72 (95% CI, 1.99‐11.21) based on 5 cholecystitis events among thyroid cancer patients.CONCLUSIONS.The results of the current study indicate that cholecystitis occurs more frequently among cancer patients than in the general population, particularly within the first 6 months after a cancer diagnosis. Clinicians who treat cancer patients should remain vigilant about this type of infection. Cancer 2008. © 2008 American Cancer Society.
Extraskeletal myxoid chondrosarcoma
Authors: Drilon Alex D. , Popat Sanjay , Bhuchar Gauri , D'Adamo David R. , Keohan Mary Louise , Fisher Cyril , Antonescu Cristina R. , Singer Samuel , Brennan Murray F. , Judson Ian , Maki Robert G. 
Published: October 2008

AbstractBACKGROUND.Extraskeletal myxoid chondrosarcoma (EMC) is a genetically distinct sarcoma with a propensity for local recurrence and metastasis despite an indolent course. To the authors' knowledge, there are limited data examining chemotherapy outcomes as a guide to therapeutic decisions for unresectable disease.METHODS.The clinical behavior and treatment responses of 87 patients with EMC who were seen at 2 institutions between 1975 and 2008 were examined.RESULTS.The median age of the patients at the time of diagnosis was 49.5 years, with a male‐to‐female ratio of 2:1. For patients presenting without metastases, 37% developed local recurrence (median time of 3.3 years) and 26% developed distal recurrence (median time of 3.2 years). Approximately 13% of patients presented with metastases. The 5‐year, 10‐year, and 15‐year overall survival rates were 82%, 65%, and 58%, respectively. Twenty‐one patients received 32 evaluable courses of chemotherapy. No significant radiologic or clinical responses were noted. The median time to disease progression while receiving chemotherapy was 5.2 months. The best physician‐assessed response to chemotherapy was stable disease for at least 6 months in 25% of patients, stable disease for <6 months in 41% of patients, and disease progression in 34% of patients. The estimated progression‐free survival rates at 3 months, 4 months, 6 months, and 9 months were 69%, 65%, 40%, and 26%, respectively.CONCLUSIONS.This retrospective review highlights the poor response rate to chemotherapy and emphasizes aggressive control of localized disease as the primary approach to management. Although there are biases inherent in retrospective analyses, these data provide a benchmark for time to disease progression for the study of new agents for the treatment of patients with this diagnosis. Cancer 2008. © 2008 American Cancer Society.
Efficient coding in dolphin surface behavioral patterns
Authors: Ferrer‐i‐Cancho Ramon , Lusseau David 
Published: October 2008

AbstractWe show that the law of brevity, i.e. the tendency of words to shorten as their frequency increases, is also found in dolphin surface behavioral patterns. As far as we know, this is the first evidence of the law in another species, suggesting that coding efficiency is not unique to humans. © 2008 Wiley Periodicals, Inc. Complexity, 2009.
Quantitative neurite outgrowth measurement based on image segmentation with topological dependence
Authors: Yu Weimiao , Lee Hwee Kuan , Hariharan Srivats , Bu Wenyu , Ahmed Sohail 
Published: October 2008

AbstractThe study of neuronal morphology and neurite outgrowth has been enhanced by the combination of imaging informatics and high content screening, in which thousands of images are acquired using robotic fluorescent microscopy. To understand the process of neurite outgrowth in the context of neuroregeneration, we used mouse neuroblastoma N1E115 as our model neuronal cell. Six‐thousand cellular images of four different culture conditions were acquired with two‐channel widefield fluorescent microscopy. We developed a software package called NeuronCyto. It is a fully automatic solution for neurite length measurement and complexity analysis. A novel approach based on topological analysis is presented to segment cells. The detected nuclei were used as references to initialize the level set function. Merging and splitting of cells segments were prevented using dynamic watershed lines based on the constraint of topological dependence. A tracing algorithm was developed to automatically trace neurites and measure their lengths quantitatively on a cell‐by‐cell basis. NeuronCyto analyzes three important biologically relevant features, which are the length, branching complexity, and number of neurites. The application of NeuronCyto on the experiments of Toca‐1 and serum starvation show that the transfection of Toca‐1 cDNA induces longer neurites with more complexities than serum starvation. © 2008 International Society for Advancement of Cytometry
Eating‐disorder symptoms and syndromes in a sample of urban‐dwelling Canadian women: Contributions toward a population health perspective
Authors: Gauvin Lise , Steiger Howard , Brodeur Jean‐Marc 
Published: October 2008

AbstractObjective:We estimated the prevalence of eating disorders and maladaptive eating behaviors in a population‐based sample and examined the association of maladaptive eating with self‐rated physical and mental health.Method:A sample of 1,501 women (mean age = 31.2 years, SD = 6.2) were recruited using random‐digit dialing to participate in a 20‐min telephone interview about eating behaviors.Results:Weighted frequency analysis showed the prevalence of frequent binge‐eating to be 4.1%, that of regular purging to be 1.1%, and that of frequent compensation to be 8.7%. Although we found none of the women to meet full criteria for anorexia nervosa, 0.6% met criteria for bulimia nervosa, 3.8% provisional criteria for binge eating disorder, and 0.6% criteria for a newly proposed entity, purging disorder. As many as 14.9% fell into a residual category representing subthreshold, but potentially problematic variants of eating disturbances. Logistic regression analyses showed that clinical‐level maladaptive eating attitudes and behaviors predicted self‐rated physical‐ and mental‐health problems after sociodemographic factors were controlled.Discussion:This population‐based survey provides prevalence estimates of BN, BED, and purging disorder that are compatible with those of recent epidemiological studies and shows that maladaptive eating attitudes and behaviors represent a substantial population burden. © 2008 by Wiley Periodicals, Inc. Int J Eat Disord 2009