bluuebunny/crossref_metadata_2025_split huggingface dataset:
Brønsted Acid Mediated Novel Rearrangements of Diarylvinylidenecyclopropanes and Mechanistic Investigations Based on DFT Calculations
Authors: Li Wei , Shi Min , Li Yuxue 
Published: July 2009

AbstractDiarylvinylidenecyclopropanes undergo a novel rearrangement in the presence of the Brønsted acid Tf2NH (Tf: trifluoromethanesulfonyl) to give the corresponding naphthalene derivatives in good to high yields upon heating, whereas in the presence of the Brønsted acid toluene‐4‐sulfonic acid (p‐TSA), the corresponding triene derivatives are afforded in moderate to good yields under mild conditions. Corresponding mechanistic studies on the basis of density functional theory (DFT) with the Gaussian03 program by using the B3LYP method have revealed that the pKa value of the Brønsted acid, as well as the entropy and solvent effects, plays a significant role in this reaction; these factors can discriminate the differences in the reactivity and regioselectivity among the Brønsted acids used in this reaction. In the presence of Lewis acid Sn(OTf)2, a butatrienecyclopane can produce the corresponding ring‐opened products in moderate yields.
ChemInform Abstract: A Catalytic Asymmetric Allylation of Aldehydes with Allyl Trichlorosilane Activated by a Chiral Tetradentate Bis‐sulfoxide.
Authors: Massa Antonio , Acocella Maria Rosaria , De Sio Vincenzo , Villano Rosaria , Scettri Arrigo 
Published: July 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Imidazolylsulfonates: Electrophilic Partners in Cross‐Coupling Reactions.
Authors: Albaneze‐Walker Jennifer , Raju Ravinder , Vance Jennifer A. , Goodman Andrew J. , Reeder Michael R. , Liao Jing , Maust Mathew T. , Irish Patrick A. , Espino Peter , Andrews David R. 
Published: July 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of Amine Functionalized Oxazolines with Applications in Asymmetric Catalysis.
Authors: Miller Jeremie J. , Rajaram Sridhar , Pfaffenroth Cornelia , Sigman Matthew S. 
Published: July 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: An Efficient Synthesis of Novel 2‐Amino‐4‐aryl‐6‐ferrocenyl Pyrimidines.
Authors: Rashinkar G. S. , Pore S. B. , Mote K. B. , Salunkhe R. S. 
Published: July 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Xylarinols A and B, Two New 2‐Benzoxepin Derivatives from the Fruiting Bodies of Xylaria polymorpha.
Authors: Lee In‐Kyoung , Jang Yun‐Woo , Kim Young‐Sook , Yu Seung Hun , Lee Kui Jae , Park Seung‐Moon , Oh Byung‐Taek , Chae Jong‐Chan , Yun Bong‐Sik 
Published: July 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Chemical Structural and Chain Conformational Characterization of Some Bioactive Polysaccharides Isolated from Natural Sources
Authors: Yang Liqun , Zhang Li‐Ming 
Published: July 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Self‐Assembly of ZnO Nanocrystals in Colloidal Solutions
Authors: Pagès Carole , Coppel Yannick , Kahn Myrtil L. , Maisonnat André , Chaudret Bruno 
Published: July 2009

AbstractThe self‐organization in solution of ZnO nanocrystals into superlattices is monitored by dynamic light scattering. When long‐alkyl‐chain amines or carboxylic acids are used as stabilizing ligands, no organization is observed. In contrast, when binary mixtures of long‐alkyl‐chain amines and carboxylic acids are used, the presence of a thermodynamic equilibrium between free and organized ZnO nanoparticles is detected in THF or toluene. The superlattices of organized ZnO nanoparticles are independently observed by TEM and SEM. The coordination mode of the ligands at the surface of the ZnO nanoparticles is evidenced by NMR studies. The presence of ion‐paired ammonium carboxylate surrounding the surface of ZnO nanoparticles appears to be a necessary requirement to govern this reversible organization. This is substantiated by the absence of organization of ZnO nanoparticles when either a solvent of high dielectric constant, such as acetone, or a strong hydrogen‐bond acceptor is used.
Applications of the Static Quenching of Rhodamine B by Carbon Nanotubes
Authors: Ahmad Ashraf , Kurkina Tetiana , Kern Klaus , Balasubramanian Kannan 
Published: July 2009

AbstractWe report here on the interaction of the fluorescent dye rhodamine B (RB) with single‐walled carbon nanotubes (SWCNTs). We observe that SWCNTs statically quench the fluorescence of RB by forming a stable ground state complex. Careful spectroscopic analysis indicates that the complex formation is efficient mainly with certain chiral forms. We propose three different applications utilizing this quenching mechanism and the associated complexation. Firstly, the quenching efficiency can be utilized as a measure for the characterization and quantification of nanotube dispersions. Secondly, we demonstrate that the specific complexation of RB can be deployed to enrich certain chiral forms in suspension. Finally, we show that RB can be effectively used to visualize nanotubes deposited on substrates.
Neural networks with quantum architecture and quantum learning
Authors: Panella Massimo , Martinelli Giuseppe 
Published: July 2009

AbstractA method is proposed for solving the two key problems facing quantum neural networks: introduction of nonlinearity in the neuron operation and efficient use of quantum superposition in the learning algorithm. The former is indirectly solved by using suitable Boolean functions. The latter is based on the use of a suitable nonlinear quantum circuit. The resulting learning procedure does not apply any optimization method. The optimal neural network is obtained by applying an exhaustive search among all the possible solutions. The exhaustive search is carried out by the proposed quantum circuit composed of both linear and nonlinear components. Copyright © 2009 John Wiley & Sons, Ltd.
Collisionless Plasma Expansion in the Presence of a Dipole Magnetic Field
Authors: Nersisyan H. B. , Osipyan D. A. 
Published: July 2009

AbstractThe collisionless interaction of an expanding high–energy plasma cloud with a magnetized background plasma in the presence of a dipole magnetic field is examined in the framework of a 2D3V hybrid (kinetic ions and massless fluid electrons) model. The retardation of the plasma cloud and the dynamics of the perturbed electromagnetic fields and the background plasma are studied for high Alfvén–Mach numbers using the particle–in–cellmethod. It is shown that the plasma cloud expands excluding the ambient magnetic field and the background plasma to form a diamagnetic cavity which is accompanied by the generation of a collisionless shock wave. The energy exchange between the plasma cloud and the background plasma is also studied and qualitative agreement with the analytical model suggested previously is obtained (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Study on the Relation Between Discharge Voltage and Magnetic Field Topography in a Hall Thruster Discharge Channel
Authors: Yu D. R. , Li J. , Liu H. , Ning Z. X. , Li Y. 
Published: July 2009

AbstractThe relation between magnetic field topography and operating voltage is investigated in a 1kW Hall thruster discharge channel in order to focus the ion beam effectively and optimize the performance. The curvature of magnetic field line (α) is introduced to characterize the differences of topologies. The optimized magnetic field distribution under each operating voltage is obtained by experiment. Through the curvature transformation, we find that the area of (α > 1) in the channel gradually decreases with the increase of the operating voltage. In response to the results above, two dimensional plasma flows are simulated employing Particle‐in‐Cell method. The distributions of the electric potential, ion density and ion radial velocity are calculated to understand the important influence of the relation above on ion beam focusing. The numerical results indicate that magnetic field curvature and thermal electric field control the ion beam in the ionization and acceleration zone, respectively. The magnetic field topography and discharge voltage interact with each other and together form the focusing electric field. The ion radial mobility is suppressed effectively and the ion beam is focused to the channel centerline. In addition, for a given voltages, when the area of (α > 1) is larger than the optimal scope, the electric potential lines excessively bend to the anode causing ion over focus; contrarily, the electric potential lines will bend to the exit and defocus ions. All these results suggest the relation between magnetic field topography and discharge voltage is important to the ion radial flow control and performance optimization of the Hall thruster (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Cyclic Trinuclear Diorganotin(IV) Complexes – The First Tin Compounds Bearing Oximehydroxamate Ligands: Synthesis, Structural Characterization and High In Vitro Cytotoxicity
Authors: Gajewska Malgorzata , Luzyanin Konstantin V. , Guedes da Silva M. Fátima C. , Li Qingshan , Cui Jingrong , Pombeiro Armando J. L. 
Published: July 2009

AbstractThe reactions between equimolar amounts of R2SnO (R = Me 1, nBu 2) and N,2‐dihydroxy‐5‐[N‐hydroxyethanimidoyl]benzamide (H2L) under solvent reflux conditions (in toluene for 1 and methanol for 2) for ca. 4 h led to the formation of the trinuclear tin complexes [R2Sn(L)]3 (R = Me 3, nBu 4) isolated as colourless crystalline solids in ca. 85 % yield, which were characterized by IR, 1H, 13C and 119Sn NMR spectroscopy, elemental analysis and (for 4) by X‐ray diffraction. The trinuclear Sn core is stabilized by multiple intramolecular hydrogen bonding interactions involving the hydroxamate ligands, whereas the uncoordinated oxime functions interact through intermolecular H‐bonds leading to cyclic hexameric assemblies. These complexes are stable in air, soluble in common solvents and moderately in water and represent the first examples of tin species containing ligatedoximehydroxamic acids. Complex 4 exhibits high in vitrotumour‐inhibiting activity against the following human cell lines: promyelocyticfina leukemia (HL‐60), hepatocellular carcinoma (Bel‐7402), gastric carcinoma (BGC‐823) andnasopharyngeal carcinoma (KB). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
Reduction of Disulfides with Magnesium(II) and Gallium(II) Complexes of a Redox‐Active Diimine Ligand
Authors: Fedushkin Igor L. , Nikipelov Alexander S. , Skatova Alexandra A. , Maslova Olga V. , Lukoyanov Anton N. , Fukin Georgy K. , Cherkasov Anton V. 
Published: July 2009

AbstractThe reactions of (dpp‐bian)Mg(thf)3 (1) {dpp‐bian = 1,2‐bis[(2,6‐diisopropylphenyl)imino]acenaphthene} with 0.5 molar equivalents of RS–SR (R = Bz, sBu, C(S)NMe2) occur with a cleavage of the S–S bond to afford monosulfide complexes (dpp‐bian)Mg(SBz)(dme) (2), (dpp‐bian)Mg[S(sBu)](dme) (3), and (dpp‐bian)Mg[SC(S)NMe2](thf) (4). Compounds 2, 3, and 4 are paramagnetic due to the presence of dpp‐bian radical‐anions that are formed in the course of one‐electron transfer from the dpp‐bian dianion in 1 to the sulfur‐containing substrate. Reduction of BzS–SBz with gallane (dpp‐bian)Ga–Ga(dpp‐bian) (5) gives a mononuclear GaIII complex with the dpp‐bian radical‐anion, (dpp‐bian)Ga(SBz)2 (6). The reaction of 5 with RS–SR (R = C(S)NMe2) proceeds with a cleavage of the S–S and Ga–Ga bonds and affords (dpp‐bian)Ga[SC(S)NMe2] (7), in which the dpp‐bian ligand retains its dianionic state. Complexes 2, 3, 4, and 6 have been characterized by ESR and IR spectroscopy, and complex 7 has been studied by 1H MNR spectroscopy. The molecular structures of 2–4, 6, and 7 have been determined by X‐ray crystallography. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
Detection of Single Nucleotide Polymorphisms in p53 Mutation Hotspots and Expression of Mutant p53 in Human Cell Lines Using an Enzyme‐Linked Electrochemical Assay
Authors: Horáková Petra , Šimková Eva , Vychodilová Zdenka , Brázdová Marie , Fojta Miroslav 
Published: July 2009

AbstractAn enzyme‐linked electrochemical technique for single nucleotide polymorphism (SNP) typing in the p53 tumor suppressor gene is presented. The technique is based on a DNA polymerase‐catalyzed extension of a primer hybridized to a target DNA strand upstream (5′→3′) to the SNP site by one nucleotide bearing a biotin tag. Under optimized conditions, efficient incorporation of the biotinylated nucleotide occurs only in the case of complementarity between the first nucleotide in single‐stranded 5′‐overhang of the target strand. The introduced biotin tag is detected after capture of the primer extension products at magnetic beads bearing oligoT strands via oligoA adaptors at 5′‐ends of the primer, binding of streptavidin‐alkaline phosphatase conjugate and enzymatic conversion of 1‐naphthyl phosphate into 1‐naphthol which is determined electrochemically at carbon electrodes. In addition to model studies with synthetic oligonucleotides, we report on detection of mutant p53 expression in human cell lines using reverse transcription‐PCR technique combined with amplified primer extension and the magnetic beads‐based electrochemical assay.
Combustion properties of laminated veneer lumbers bonded with PVAc, PF adhesives and impregnated with some fire retardants
Authors: Kurt Şeref , Uysal Burhanettin 
Published: July 2009

AbstractIn this study, the effects of impregnation materials di‐ammonium phosphate, aluminium sulphate, potassium carbonate, calcium chloride, zinc chloride on combustion properties of 3 ply laminated veneer lumbers (LVL) produced from Walnut (Juglans regiaL.) using phenol–formaldehyde (PF), poly (vinyl acetate) have been investigated. The pressure‐vacuum method was used for impregnation process. Combustion test was performed according to the procedure of ASTM‐E 69 standards. During the test, mass reduction, temperature and released gas (CO, NOX, SO2, O2) were determined every 30 s. As a result, zinc chloride was found to be the most successful fire‐retardant chemical in LVL at PF adhesive. Since it diminishes combustion, the fire retardant of LVL produced from walnut using PF adhesive can be advised. Copyright © 2009 John Wiley & Sons, Ltd.
Mechanisms underlying the inhibition of the cytochrome P450 system by copper ions
Authors: Letelier M. E. , Faúndez M. , Jara‐Sandoval J. , Molina‐Berríos A. , Cortés‐Troncoso J. , Aracena‐Parks P. , Marín‐Catalán R. 
Published: July 2009

AbstractCopper toxicity has been associated to the capacity of free copper ions to catalyze the production of superoxide anion and hydroxyl radical, reactive species that modify the structure and/or function of biomolecules. In addition, nonspecific Cu2+‐binding to thiol enzymes, which modifies their catalytic activities, has been reported. Cytochrome P450 (CYP450) monooxygenase is a thiol protein that binds substrates in the first and limiting step of CYP450 system catalytic cycle, necessary for the metabolism of lipophilic xenobiotics. Therefore, copper ions have the potential to oxidize and bind to cysteinyl residues of this monooxygenase, altering the CYP450 system activity. To test this postulate, we studied the effect of Cu2+alone and Cu2+/ascorbate in rat liver microsomes, to independently evaluate its nonspecific binding and its pro‐oxidant effects, respectively. We assessed these effects on the absorbance spectrum of the monooxygenase, as a measure of structural damage, andp‐nitroanisoleO‐demethylating activity of CYP450 system, as a marker of functional impairment. Data obtained indicate that Cu2+could both oxidize and bind to some amino acid residues of the CYP450 monooxygenase but not to its heme group. The differences observed between the effects of Cu2+and Cu2+/ascorbate show that both mechanisms are involved in the catalytic activity inhibition of CYP450 system by copper ions. The significance of these findings on the pharmacokinetics and pharmacodynamics of drugs is discussed. Copyright © 2009 John Wiley & Sons, Ltd.
Closure of oroantral communications using biodegradable polyurethane foam: A long term study in rabbits
Authors: Visscher Susan H. , van Minnen Baucke , van Leeuwen M. Barbara M. , van Kooten Theo G. , Bos Rudolf R. M. 
Published: July 2009

AbstractAn oroantral communication (OAC) is an open connection between the oral cavity and maxillary sinus. Closure of OACs is commonly performed with a surgical procedure using a mucoperiosteal flap. An alternative technique using synthetic biodegradable polyurethane (PU) foam for closure of OACs is presented. This PU foam is composed of hard urethane segments, and soft segments made of D/L lactide (50/50), ε‐caprolactone, and 5% polyethyleneglycol (PEG). To evaluate the use of PU foam for this application, OACs were created in the edentulous part of the maxilla in 21 rabbits, after which PU foams were fitted in the defects. Results showed complete healing of the oral mucosa after 4–10 weeks, healing of the antral mucosal lining after 6 months and complete bony regeneration after 1 year. No reopening of the defects occurred and no maxillary sinusitis was observed. Degradation of the PU foam had not yet reached completion 1 year after implantation. In conclusion, PU foam with 5% PEG provides adequate closure of an OAC in the rabbit model to support healing of the oral and maxillary sinus mucosa. Longer time intervals are needed to assess the complete degradation of the PU foam. © 2009 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2009
Prescribers hold key to systemic reduction of medication error occurrences
Authors: West John C. 
Published: July 2009

AbstractThe medication use process is a complex system made up of interlocking component subsystems. These include the prescribing, dispensing and administration systems. Although great emphasis has been placed on preventing errors in the administration process, the prescribing process can be a common source of error. Physicians and other practitioners need to be aware of the sources of error in this subsystem and need to be receptive to ideas and suggestions for reducing prescribing errors, because only the prescribers themselves can fix this part of the system.
Information technology in health care: Addressing promises and pitfalls
Authors: Stanyon Robert 
Published: July 2009

AbstractHealth information technology (HIT) and electronic medical records systems are receiving much attention in health care though only a relatively small number of health care organizations and providers have embraced the technology. This article introduces important concepts and definitions and provides the risk manager with key elements to consider when incorporating HIT principles into a proactive risk management program. A checklist is offered to assist in the assessment of electronic records systems.
Informed consent and expectation management: A case study
Authors: Sobel David , Popp Pamela L. 
Published: July 2009

AbstractPurpose: To explore patient responsiveness when exposed to an online educational tool and to determine level of engagement in their medical care/treatment as a consequence of this exposure.Method: More than 2,400 patients were exposed to the Emmi Solutions online, interactive and illustrated education tool for the procedures of gastric bypass, total hip replacement and colonoscopy. These procedures were chosen to reflect an elective surgery, a significant surgery (non‐elective) and an elective diagnostic procedure. Patient responses were then analyzed to determine the level of engagement through feedback questions and comments, as well as determination of the value of the experience as rated by the patient.Results: More than 80 percent of patients felt that the online educational tool enhanced their understanding of the procedure/treatment. Specific comments and ratings reflect that the patients were more informed after the experience, and more than 90 percent felt sufficiently impressed with the tool to share it with their friends/family.Conclusions: Utilizing an interactive educational tool enhances the patient's appreciation for the specifics of the treatment/procedure, increases their awareness of risks, provides information and comfort in knowledge and increases their confidence in the provider of the treatment/procedure. A significant percentage of the patients even engaged their family and friends in reviewing the tool, illustrating significant engagement in their pre‐treatment/procedure experience.
Taking the correct approach
Authors: Smith Paul English 
Published: July 2009

AbstractWelcome to ASHRM's 27th year! We have started this year off with a fresh new look through the introduction of a new logo and publications format, as you can see from this edition of the Journal, and from the information published in the January/February edition of the Forum newsletter. This is the product of a lot of effort on the part of the ASHRM staff over the past year, and I hope you will join me in letting them know how much we appreciate their efforts to update and maintain ASHRM's positive image as a professional association.
A proposed partnership for investigating device‐related accidents
Authors: Shepherd Marvin , Dreps Douglas , Hyndman Bruce 
Published: July 2009

AbstractThe quality of a device‐related, accident investigation is largely determined by the clinical and technical data available to the investigators. After an event, traditional legal conflicts have tended to prevent full information sharing between the manufacturer and the risk manager of the healthcare facility. We propose that, under the guidance of a risk manager, a healthcare clinical engineer partner with an engineer from the manufacturer and each partner provide maximum information and focused attention on the investigation. The synergy of the partnership should provide a more effective investigation and an increased patient safety in the healthcare delivery system.
Avoiding pitfalls of anticoagulation therapy
Authors: Nasraway Stanley A. 
Published: July 2009

AbstractAntithrombotic therapy poses a significant risk of litigation owing to the risk of devastating outcomes from both the condition for which the therapy is necessary and the therapy itself. Using a case‐based approach, this article illustrates how evidence‐based guidelines, documentation, and patient communication can potentially reduce the likelihood of errors associated with antithrombotic therapy.