bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quotation accuracy in medical journal articles —a systematic review and meta-analysis
Authors: Jergas Hannah , Baethge Christopher 
Published: October 2015

Background.Quotations and references are an indispensable element of scientific communication. They should support what authors claim or provide important background information for readers. Studies indicate, however, that quotations not serving their purpose—quotation errors—may be prevalent.Methods.We carried out a systematic review, meta-analysis and meta-regression of quotation errors, taking account of differences between studies in error ascertainment.Results.Out of 559 studies screened we included 28 in the main analysis, and estimated major, minor and total quotation error rates of 11,9%, 95% CI [8.4, 16.6] 11.5% [8.3, 15.7], and 25.4% [19.5, 32.4]. While heterogeneity was substantial, even the lowest estimate of total quotation errors was considerable (6.7%). Indirect references accounted for less than one sixth of all quotation problems. The findings remained robust in a number of sensitivity and subgroup analyses (including risk of bias analysis) and in meta-regression. There was no indication of publication bias.Conclusions.Readers of medical journal articles should be aware of the fact that quotation errors are common. Measures against quotation errors include spot checks by editors and reviewers, correct placement of citations in the text, and declarations by authors that they have checked cited material. Future research should elucidate if and to what degree quotation errors are detrimental to scientific progress.
Investigation of the links between water vapor field evolution and rain rate based on 5 years of measurements at a midlatitude site
Authors: Labbouz Laurent , Van Baelen Joël , Duroure Christophe 
Published: October 2015

AbstractBased on 5 years of measurements of integrated water vapor (IWV), surface mixing ratio (MR), and rain rate, we investigate the relationship between the water vapor field evolution and the precipitation lifecycle. We show that in 76% of the cases the IWV reaches a maximum before the peak of precipitation, with the precipitation peak occurring on average 20 min after the IWV maximum. This delay can be related to the fall time of the precipitation. We also show that the moister the atmosphere, the greater the precipitation rates and the longer the delay. Unlike the IWV, the MR reaches a maximum after the precipitation peak in 60% of the cases, highlighting the interest of IWV compared to surface MR only. This paper and the discussions within it open a pathway to complementary studies and applications for heavy precipitation prediction.
Undercurrent‐driven upwelling in the northwestern Arafura Sea
Authors: Kämpf Jochen 
Published: October 2015

AbstractA three‐dimensional process‐oriented model is applied to explore the circulation in the Arafura Sea during the southeasterly monsoon. During this period, widespread phytoplankton blooms develop in a large area (300 km × 300 km) in the northwestern Arafura Sea. The model findings indicate that undercurrents are the principal source of nutrient‐rich Banda Sea slope water for the region. It is demonstrated that these undercurrents operate to flush the northwestern Arafura Sea with Banda Sea slope water on a time scale of 1–3 months, which is consistent with observational evidence. The simulated undercurrents are the signature of the classical lee effect, frequently observed in lakes, that comes into play in the Arafura Sea given its bay‐like geometry, shallow‐water depth (40–50 m), and close vicinity to the equator. It is also shown that density stratification and rotational effects have important influences on the pathway and intensity of the overturning circulation in the northwestern Arafura Sea, which needs to be further explored in the future.
Diazepam effect during early neonatal development correlates with neuronal Cl−
Authors: Glykys Joseph , Staley Kevin J. 
Published: October 2015

AbstractObjectiveAlthough benzodiazepines and other GABAA receptors allosteric modulators are used to treat neonatal seizures, their efficacy may derive from actions on subcortical structures. Side effects of benzodiazepines in nonseizing human neonates include myoclonus, seizures, and abnormal movements. Excitatory actions of GABA may underlie both side effects and reduced anticonvulsant activity of benzodiazepines. Neocortical organotypic slice cultures were used to study: (1) spontaneous cortical epileptiform activity during early development; (2) developmental changes in [Cl−]i and (3) whether diazepam's anticonvulsant effect correlated with neuronal [Cl−]i.MethodsEpileptiform activity in neocortical organotypic slice cultures was measured by field potential recordings. Cl− changes during development were assessed by multiphoton imaging of neurons transgenically expressing a Cl‐sensitive fluorophore. Clinically relevant concentrations of diazepam were used to test the anticonvulsant effectiveness at ages corresponding to premature neonates through early infancy.Results(1) Neocortical organotypic slices at days in vitro 5 (DIV5) exhibited spontaneous epileptiform activity. (2) Epileptiform event duration decreased with age. (3) There was a progressive decrease in [Cl−]i over the same age range. (4) Diazepam was ineffective in decreasing epileptiform activity at DIV5‐6, but progressively more effective at older ages through DIV15. (5) At DIV5‐6, diazepam worsened epileptiform activity in 50% of the slices.InterpretationThe neocortical organotypic slice is a useful model to study spontaneous epileptiform activity. Decreasing [Cl−]i during development correlates with decreasing duration of spontaneous epileptiform activity and increasing anticonvulsant efficacy of diazepam. We provide a potential explanation for the reports of seizures and myoclonus induction by benzodiazepines in newborn human neonates and the limited electrographic efficacy of benzodiazepines for the treatment of neonatal seizures.
Zinc Acetate‐Catalyzed Enantioselective Hydrosilylation of Ketones
Authors: Szewczyk Marcin , Stanek Filip , Bezłada Agata , Mlynarski Jacek 
Published: October 2015

AbstractZinc acetate complexes with a chiral diphenylethylenediamine (DPEDA)‐derived ligand have been proved to be efficient catalysts for the enantioselective hydrosilylation of aryl ketones. Replacing pyrophoric dialkylzinc with the readily available zinc salt simplifies the procedures and provides excellent conversions (up to >99%) and enantioselectivities (ees up to 97%).magnified image
Tau positron emission tomographic imaging in aging and early Alzheimer disease
Authors: Johnson Keith A. , Schultz Aaron , Betensky Rebecca A. , Becker J. Alex , Sepulcre Jorge , Rentz Dorene , Mormino Elizabeth , Chhatwal Jasmeer , Amariglio Rebecca , Papp Kate , Marshall Gad , Albers Mark , Mauro Samantha , Pepin Lesley , Alverio Jonathan , Judge Kelly , Philiossaint Marlie , Shoup Timothy , Yokell Daniel , Dickerson Bradford , Gomez‐Isla Teresa , Hyman Bradley , Vasdev Neil , Sperling Reisa 
Published: October 2015

ObjectiveDetection of focal brain tau deposition during life could greatly facilitate accurate diagnosis of Alzheimer disease (AD), staging and monitoring of disease progression, and development of disease‐modifying therapies.MethodsWe acquired tau positron emission tomography (PET) using 18F T807 (AV1451), and amyloid‐β PET using 11C Pittsburgh compound B (PiB) in older clinically normal individuals, and symptomatic patients with mild cognitive impairment or mild AD dementia.ResultsWe found abnormally high cortical 18F T807 binding in patients with mild cognitive impairment and AD dementia compared to clinically normal controls. Consistent with the neuropathology literature, the presence of elevated neocortical 18F T807 binding particularly in the inferior temporal gyrus was associated with clinical impairment. The association of cognitive impairment was stronger with inferior temporal 18F T807 than with mean cortical 11C PIB. Regional 18F T807 was correlated with mean cortical 11C PiB among both impaired and control subjects.InterpretationThese findings suggest that 18F T807 PET could have value as a biomarker that reflects both the progression of AD tauopathy and the emergence of clinical impairment. ANN NEUROL 2016;79:110–119
Dielectric and microwave properties of elastomer composites loaded with carbon–silica hybrid fillers
Authors: Al‐Ghamdi Ahmed A. , Al‐Hartomy Omar A. , Al‐Solamy Falleh R. , Dishovsky Nikolay , Mihaylov Mihail , Malinova Petrunka , Atanasov Nikolay 
Published: October 2015

ABSTRACTIn this study, we investigated the influence of carbon–silica dual‐phase fillers on the dielectric and microwave properties of natural‐rubber‐based composites determined in the frequency range from 1 to 12 GHz. The fillers were prepared by the impregnation of two types of carbon black with various silicasol amounts. As the results show, the fillers affected both the dielectric and microwave properties of the obtained composites. The higher the quantity of the dielectric phase (silica) in the hybrid filler was, the lower the real part of the permittivity of the composites was. This caused changes in the total, reflective, and absorptive shielding effectivenesses of the latter and their reflection and attenuation coefficients. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 42978.
Expressions of student debt aversion and tolerance among academically able young people in low‐participation English schools
Authors: Jones Steven 
Published: October 2015

AbstractThe 2012 rise in student fees, from £3375 to £9000 per year, made England one of the costliest places to attend university in the world. Drawing on evidence from higher attaining young people attending low‐participation schools, this paper renews established types of student debt aversion and tolerance, with sensitivity towards whether they reflect the (financial) ‘price’ of participation or the (cultural, social) ‘cost’ of participation. Findings point to a complex web of inter‐related factors informing a decision‐making process that is rational, but often lacking detailed knowledge of key variables, such as the range of bursaries and grants available and the terms of the loan repayment. The Ellsburg Paradox is invoked to explain the tendency of some young people to self‐exclude, contrary to rational choice theory. For those without family support or precedent, participation is not greatly incentivised by assumed lifestyle and identity gains, and generous repayment concessions for low‐earning graduates do not necessarily ease anxiety about debt. Data point to a heightened awareness of labour market alternatives and of continued disquiet, both academic and non‐academic, about ‘fitting in’ at university. Naturally, higher fees demand a recalculation of return‐on‐investment estimates for all young people. However, the participation ‘bet’ of those from low‐participation schools is framed in ways unacknowledged by (and sometimes discordant with) dominant public discourses.
Volume–outcome relationship in pancreatic surgery
Authors: Alsfasser G , Leicht H , Günster C , Rau B M , Schillinger G , Klar E 
Published: October 2015

Abstract

Background
Volume–outcome relationships related to major surgery may be of limited value if observation ends at the point of discharge without taking transfers and later events into consideration.

Methods
The volume–outcome relationship in patients who underwent pancreatic surgery between 2008 and 2010 was assessed using claims data for all inpatient episodes from Germany's largest provider of statutory health insurance covering about 30 per cent of the population. Multiple logistic regression models with random effects were used to analyse the effect of hospital volume (using volume quintiles) on 1-year mortality, adjusting for age, sex, primary disease, type of surgery and co-morbidities. Additional outcomes were in-hospital (including transfer to other hospitals until final discharge) and 90-day mortality.

Results
Of 9566 patients identified, risk-adjusted 1-year mortality was significantly higher in the three lowest-volume quintiles compared with the highest-volume quintile (odds ratio 1·73, 1·53 and 1·37 respectively). A similar, but less pronounced, effect was demonstrated for in-hospital and 90-day mortality. The effect of hospital volume on 1-year mortality was comparable to the effect of co-morbid conditions such as renal failure.

Conclusion
Although mortality related to pancreatic surgery is influenced by many factors, this study demonstrated lower mortality at 1 year in high-volume centres in Germany.
Evaluation of a 7‐Methoxycoumarin‐3‐carboxylic Acid Ester Derivative as a Fluorescent, Cell‐Cleavable, Phosphonate Protecting Group
Authors: Wiemer Andrew J. , Shippy Rebekah R. , Kilcollins Ashley M. , Li Jin , Hsiao Chia‐Hung Christine , Barney Rocky J. , Geng M. Lei , Wiemer David F. 
Published: October 2015

AbstractCell‐cleavable protecting groups often enhance cellular delivery of species that are charged at physiological pH. Although several phosphonate protecting groups have achieved clinical success, it remains difficult to use these prodrugs in live cells to clarify biological mechanisms. Here, we present a strategy that uses a 7‐methoxycoumarin‐3‐carboxylic acid ester as a fluorescent protecting group. This strategy was applied to synthesis of an (E)‐4‐hydroxy‐3‐methyl‐but‐2‐enyl diphosphate (HMBPP) analogue to assess cellular uptake and human Vγ9Vδ2 T cell activation. The fluorescent ester displayed low cellular toxicity (IC50>100 μm) and strong T cell activation (EC50=0.018 μm) relative to the unprotected anion (EC50=23 μm). The coumarin‐derived analogue allowed no‐wash analysis of biological deprotection, which revealed rapid internalization of the prodrug. These results demonstrate that fluorescent groups can be applied both as functional drug delivery tools and useful biological probes of drug uptake.
ChemInform Abstract: Pb2Ba3(BO3)3Cl: A Material with Large SHG Enhancement Activated by Pb‐Chelated BO3Groups.
Authors: Dong Xiaoyu , Jing Qun , Shi Yunjing , Yang Zhihua , Pan Shilie , Poeppelmeier Kenneth R. , Young Joshua , Rondinelli James M. 
Published: October 2015

AbstractPolycrystalline Pb2Ba3(BO3)3Cl is prepared by calcination of a stoichiometric mixture of PbO, Ba(NO3)2, BaCl2, and H3BO3 (muffle furnace, staged heating, 715 °C, 48 h).
ChemInform Abstract: Structure and Oxide Ion Conductivity in Tetragonal Tungsten Bronze BaBiNb5O15.
Authors: Ma Hongqiang , Lin Kun , Fan Longlong , Rong Yangchun , Chen Jun , Deng Jinxia , Liu Laijun , Kawaguchi Shogo , Kato Kenichi , Xing Xianran 
Published: October 2015

AbstractBaBiNb5O15 is prepared by firing a stoichiometric mixture of BaCO3, Nb2O5, and Bi2O3 (1240 °C, 2 h).
ChemInform Abstract: Functional Properties of Sm2NiMnO6 Multiferroic Ceramics Prepared by Spark Plasma Sintering.
Authors: Gheorghiu Felicia , Curecheriu Lavinia , Lisiecki Isabelle , Beaunier Patricia , Feraru Simona , Palamaru Mircea N. , Musteata Valentina , Lupu Nicoleta , Mitoseriu Liliana 
Published: October 2015

AbstractSm2NiMnO6 is prepared by auto‐combustion of a dried gel formed by heating a HNO3 solution of Sm(NO3)3, Ni(NO3)2, Mn, and citric acid (150 °C ignition temperature).
ChemInform Abstract: Nickel‐Containing Keggin‐Type Polyoxometalates as Hydrogen Evolution Catalysts: Photochemical Structure—Activity Relationships.
Authors: von Allmen Kim , More Rene , Mueller Rafael , Soriano‐Lopez Joaquin , Linden Anthony , Patzke Greta R. 
Published: October 2015

AbstractThe Ni‐monosubstituted Keggin‐type polyoxometalates (POMs) K5 [Ni(H2O)PW11O39]·12H2O (I), K6 [Ni(H2O)GeW11O39]·14H2O (II), and K6 [Ni(H2O)SiW11O39]·14H2O (III) are prepared according to a modified published method.
ChemInform Abstract: SrSnO3:N — Nitridation and Evaluation of Photocatalytic Activity.
Authors: Lobo Tatiane Martins , Lebullenger Ronan , Bouquet Valerie , Guilloux‐Viry Maryline , Santos Ieda Maria Garcia , Weber Ingrid Tavora 
Published: October 2015

AbstractSrSnO3 powders are prepared by firing SrCO3 and SnO2 in air (800 °C, 6 h) followed by thermal nitridation under a stream of NH3 at 600 °C and 650 °C.
ChemInform Abstract: Synthesis of Magnetic Doped Kesterite Single Crystals.
Authors: Podsiadlo Slawomir , Bialoglowski Maciej , Fadaghi Mohammad , Gebicki Wojciech , Jastrzebski Cezariusz , Zero Elzbieta , Trzybinski Damian , Wozniak Krzysztof 
Published: October 2015

AbstractCu2MSnS4 (M: Zn, Fe, Mn, Ni) single crystal kesterites are prepared by chemical transport reaction using the corresponding metals, sulfur, and minor amounts of I2 (evacuated quartz ampoules, 650 °C, 100 °C temp.
ChemInform Abstract: Rattling in the Quadruple Perovskite CuCu3V4O12.
Authors: Akizuki Yasuhide , Yamada Ikuya , Fujita Koji , Taga Kazuya , Kawakami Takateru , Mizumaki Masaichiro , Tanaka Katsuhisa 
Published: October 2015

AbstractA new A‐site‐ordered quadruple perovskite CuCu3V4O12 is obtained by a high‐pressure solid state reaction of a 2:12:3:5 molar mixture of Cu2O, CuO, V2O3, and V2O5, resp.
ChemInform Abstract: Phosphine‐Catalyzed Doubly Stereoconvergent γ‐Additions of Racemic Heterocycles to Racemic Allenoates: The Catalytic Enantioselective Synthesis of Protected α,α‐Disubstituted α‐Amino Acid Derivatives.
Authors: Kalek Marcin , Fu Gregory C. 
Published: October 2015

AbstractThis is the first method for the γ‐addition of racemic heterocycles to racemic allenoates that allows the generation of new stereogenic centers at both ends of the newly formed bond.
ChemInform Abstract: Octahedral Chiral‐at‐Metal Iridium Catalysts: Versatile Chiral Lewis Acids for Asymmetric Conjugate Additions.
Authors: Shen Xiaodong , Huo Haohua , Wang Chuanyong , Zhang Bo , Harms Klaus , Meggers Eric 
Published: October 2015

AbstractChiral iridium(III) complexes are applied as versatile catalysts in numerous asymmetric transformations of α,β‐unsaturated carbonyl compounds, namely Friedel‐Crafts alkylations, Michael additions with CH‐acidic compounds and cycloadditions with nitrones and alkenes.
ChemInform Abstract: Regio‐ and Stereoselective Conjugate Addition of Aldehydes to β‐Tosyl Enones under the Catalysis of a Binaphthyl‐Modified Chiral Amine.
Authors: Kano Taichi , Sugimoto Hisashi , Maruyama Hiroki , Maruoka Keiji 
Published: October 2015

AbstractThe regio‐, diastereo‐, and enantioselective addition of aliphatic aldehydes to β‐tosyl enones is achieved in the presence of axially chiral binaphthyl based secondary amine catalysts.
ChemInform Abstract: Stereoselective Alkylation of (S)‐N‐Acyl‐4‐isopropyl‐1,3‐thiazolidine‐2‐thiones Catalyzed by (Me3P)2NiCl2.
Authors: Fernandez‐Valparis Javier , Romo Juan Manuel , Romea Pedro , Urpi Felix , Kowalski Hubert , Font‐Bardia Merce 
Published: October 2015

AbstractAll alkylation products are isolated as single diastereoisomers which can be converted into enantiomerically pure derivatives after simple removal of the chiral auxiliary (not shown).
ChemInform Abstract: Addition of Trifluoroborates to Oxetanyl N,O‐Acetals: Entry into Spiro and Fused Saturated Heterocycles.
Authors: Brady Patrick B. , Carreira Erick M. 
Published: October 2015

AbstractAddition reactions of oxetanyl N,O‐acetals with alkynyl‐, vinyl‐, allyl‐, and allenylpotassium trifluoroborates are presented.
ChemInform Abstract: Inversion of Diastereoselectivity under High Pressure Conditions: Diels—Alder Reactions of 12‐N‐Substituted Derivatives of (‐)‐Cytisine with N‐Phenylmaleimide.
Authors: Tsypysheva Inna P. , Borisevich Sophia S. , Lobov Alexander N. , Kovalskaya Alena V. , Shamukaev Vadim V. , Safiullin Rustam L. , Khursan Sergey L. 
Published: October 2015

AbstractThe high pressure Diels‐Alder title reaction yields products with inverted diastereoselectivity compared to thermal conditions.
ChemInform Abstract: The [2 + 2] Cycloaddition—Retroelectrocyclization and [4 + 2] Hetero‐Diels—Alder Reactions of 2‐(Dicyanomethylene)indan‐1,3‐dione with Electron‐Rich Alkynes: Influence of Lewis Acids on Reactivity.
Authors: Donckele Etienne J. , Finke Aaron D. , Ruhlmann Laurent , Boudon Corinne , Trapp Nils , Diederich Francois 
Published: October 2015

AbstractDepending on the presence of a Lewis acid, 2‐(dicyanomethylene)indan‐1,3‐dione (I) reacts with electron‐rich alkynes either to cyanobuta‐1,3‐dienes via formal [2 + 2] cycloaddition—retroelectrocyclization or to fused 4H‐pyrans via formal [4 + 2] hetero‐Diels—Alder reaction.
ChemInform Abstract: 2‐[(Neopentyl glycolato)boryl]phenyl Triflates and Halides for Fluoride Ion‐Mediated Generation of Functionalized Benzynes.
Authors: Ikawa Takashi , Yamamoto Rika , Takagi Akira , Ito Toyohiro , Shimizu Kazunori , Goto Masahiko , Hamashima Yoshitaka , Akai Shuji 
Published: October 2015

AbstractVarious benzo‐fused multi‐cyclic compounds are obtained with good functional group tolerance by [4+2], [3+2], or [2+2] cycloaddition reactions of in situ generated benzynes with furan, azide, ketene acetal, or nitrone derivatives.
ChemInform Abstract: Double C—H Functionalization to Construct Polycyclic Heteroarenes Catalyzed by an Ionic Salt of a Pd Complex with an N‐Heterocyclic Carbene Ligand.
Authors: Ghosh Sanjay Kumar , Kuo Bing‐Chiuan , Chen Hsiang‐Yu , Li Jia‐Ying , Liu Shuang‐De , Lee Hon Man 
Published: October 2015

AbstractThe new ionic salt catalyzes the double C—H activation of nitrogen‐ and sulfur‐containing heterocyclic substrates in oxidative coupling reactions with alkynes.
ChemInform Abstract: Deep Eutectic Solvents: Biorenewable Reaction Media for Au(I)‐Catalyzed Cycloisomerisations and One‐Pot Tandem Cycloisomerization/Diels—Alder Reactions.
Authors: Vidal C. , Merz L. , Garcia‐Alvarez J. 
Published: October 2015

AbstractCycloisomerization reactions of (Z)‐enynols (I) to the corresponding furans are performed in the eutectic mixture of choline chloride/glycerol using a gold(I) complex as catalyst.
ChemInform Abstract: Borinic Acid Catalyzed, Regioselective Chloroacylations and Chlorosulfonylations of 2,3‐Epoxy Alcohols.
Authors: Tanveer Kashif , Jarrah Kareem , Taylor Mark S. 
Published: October 2015

AbstractThe reactions proceed with significant levels of regioselectivity for both the ring‐opening and O‐functionalization steps.
ChemInform Abstract: Conversion of Ester Moieties to 4‐Bromophenyl Groups via Electrocyclic Reaction of Dibromocyclopropanes.
Authors: Ueda Kyosuke , Umihara Hirotatsu , Yokoshima Satoshi , Fukuyama Tohru 
Published: October 2015

AbstractThe utility of this method is demonstrated in the conversion of lactone (VIII) to compound (IX).
ChemInform Abstract: High Pressure Organic Chemistry. Part 40. Enantioselective Synthesis of Quaternary Carbon Stereogenic Centers Through the Primary Amine‐Catalyzed Michael Addition Reaction of α‐Substituted Cyclic Ketones at High Pressure.
Authors: Horinouchi Ryo , Kamei Kouhei , Watanabe Riki , Hieda Nobushige , Tatsumi Naoki , Nakano Keiji , Ichikawa Yoshiyasu , Kotsuki Hiyoshizo 
Published: October 2015

AbstractCompounds bearing a quaternary carbon stereogenic center at the α‐position of cyclic ketones are obtained by an efficient new method involving the enantioselective Michael addition of cyclic ketones with acrylates using simple chiral 1‐phenylethylamine as catalyst under high pressure.
ChemInform Abstract: A Visible‐Light‐Induced α‐H Chlorination of Alkylarenes with Inorganic Chloride under NanoAg@AgCl.
Authors: Liu Shouxin , Zhang Qi , Li Huiying , Yang Yihua , Tian Xia , Whiting Andrew 
Published: October 2015

AbstractThe method features mild reaction conditions and is based on the use of a sustainable chlorine source (NaCl/HCl) as well as a green solvent (H2O), and conversions of up to 40% are achieved.
ChemInform Abstract: Ruthenium‐Catalyzed Olefin Cross‐Metathesis with Tetrafluoroethylene and Analogous Fluoroolefins.
Authors: Takahira Yusuke , Morizawa Yoshitomi 
Published: October 2015

AbstractThe method offers an easy one‐step access to fluorinated olefins via cross‐metathesis of alkylvinyl ethers with trifluoroolefin derivatives.