bluuebunny/crossref_metadata_2025_split huggingface dataset:
Asteroseismology of red giants: From analysing light curves to estimating ages
Authors: Davies G. R. , Miglio A. 
Published: September 2016

AbstractAsteroseismology has started to provide constraints on stellar properties that will be essential to accurately reconstruct the history of the Milky Way. Here we look at the information content in data sets representing current and future space missions (CoRoT, Kepler, K2, TESS, and PLATO) for red giant stars. We describe techniques for extracting the information in the frequency power spectrum and apply these techniques to Kepler data sets of different observing length to represent the different space missions. We demonstrate that for KIC 12008916, a low‐luminosity red giant branch star, we can extract useful information from all data sets, and for all but the shortest data set we obtain good constraint on the g‐mode period spacing and core rotation rates. We discuss how the high precision in these parameters will constrain the stellar properties of stellar radius, distance, mass and age. We show that high precision can be achieved in mass and hence age when values of the g‐mode period spacing are available. We caution that tests to establish the accuracy of asteroseismic masses and ages are still “work in progress”.
Cumulative theoretical uncertainties in lithium depletion boundary age
Authors: Tognelli E. , Prada Moroni P. G. , Degl'Innocenti S. 
Published: September 2016

AbstractWe performed a detailed analysis of the main theoretical uncertainties affecting the age at the lithium depletion boundary (LDB). We computed almost 12 000 pre‐main sequence models with mass in the range [0.06, 0.4] M⊙ by varying input physics (nuclear reaction cross sections, outer boundary conditions, equation of state, and radiative opacity), initial chemical abundances (total metallicity, helium and deuterium abundances, and heavy element mixture), and convection efficiency (mixing length parameter, αML). As a first step, we investigated the effect of varying all these quantities individually within their extreme values. Then, we analysed the impact of simultaneously perturbing the main input physics/chemical abundances/parameters that affect the LDB age, without making any a priori assumption of independence among each other. Such an approach allowed us to build the cumulative error stripe which defines the edges of the maximum uncertainty region in the theoretical LDB age. The error stripe ranges from about 5–15 % for αML = 1.00, and it slightly reduces to about 5–10 % for a solar calibrated αML. About 40 % of the total error stripe is due to the uncertainty in the adopted initial chemical composition.
Impact of rotation on stellar models
Authors: Meynet G. , Maeder A. , Eggenberger P. , Ekstrom S. , Georgy C. , Chiappini C. , Privitera G. , Choplin A. 
Published: September 2016

AbstractAfter a brief recall of the main impacts of stellar rotation on the structure and the evolution of stars, four topics are addressed: 1) the links between magnetic fields and rotation; 2) the impact of rotation on the age determination of clusters; 3) the exchanges of angular momentum between the orbit of a planet and the star due to tides; 4) the impact of rotation on the early chemical evolution of the Milky Way and the origin of the carbon‐enhanced metal‐poor stars.
GALAH Survey: Chemical tagging and disk reconstruction
Authors: Bland‐Hawthorn J. , Sharma S. 
Published: September 2016

AbstractThe GALAH survey is now in its second year of a five‐year campaign to observe roughly one million stars in the southern hemisphere down to a limiting magnitude of V = 14. The project exploits the HERMES 400‐fibre échelle spectrograph at the Anglo‐Australian Telescope to measure up to 30 elemental abundances and radial velocities (≈1 km s–1 accuracy) for each star at a resolution of R = 28000. These elements fall into 8 independent groups (e.g. α, Fe peak, s‐process). For all GALAH stars, Gaia will provide distances to 1 % and transverse velocities to 1 km s–1 or better, giving us a 14D set of parameters for each star, i.e. 6D phase space and 8D abundance space. A few percent of GALAH stars will also have Kepler K2 seismological data. Here we focus on the prospect of chemically tagging the old stellar disk and making a direct measurement of how stellar migration evolves with cosmic time.
Chemodynamics of the Milky Way and disc formation history: Insight from the RAVE and Gaia‐ESO surveys
Authors: Kordopatis G. , Wyse R. F. G. , Binney J. 
Published: September 2016

AbstractMulti‐object spectrographs have opened a new window on the analyses of the chemo‐dynamical properties of old Milky Way stars. These analyses allow us to trace back the internal mechanisms and the external factors that have influenced the evolution of our Galaxy, and therefore understand fundamental aspects of galaxy evolution in general. Here, we present recent results from the RAdial Velocity Experiment (RAVE) and the Gaia‐ESO survey. These surveys explore the Milky Way properties in different ways, in terms of sample size and selection, magnitude range, and spectral resolution. We focus here on (i) the first direct detection of evidence for radial migration within the thin disc, providing insight into the history of spiral structure of the Milky Way, and (ii) the chemo‐dynamical characterisation of the metal‐weak thick and thin discs, for which chemo‐dynamical models still have difficulties in reproducing.
Galactic Archaeology with CoRoT and APOGEE: Creating mock observations from a chemodynamical model
Authors: Anders F. , Chiappini C. , Rodrigues T. S. , Piffl T. , Mosser B. , Miglio A. , Montalbán J. , Girardi L. , Minchev I. , Valentini M. , Steinmetz M. 
Published: September 2016

AbstractIn a companion paper, we have presented the combined asteroseismic‐spectroscopic dataset obtained from CoRoT light curves and APOGEE infra‐red spectra for 606 solar‐like oscillating red giants in two fields of the Galactic disc (CoRoGEE). We have measured chemical abundance patterns, distances, and ages of these field stars which are spread over a large radial range of the Milky Way's disc. Here we show how to simulate this dataset using a chemodynamical Galaxy model. We also demonstrate how the observation procedure influences the accuracy of our estimated ages.
Milky Way's thick and thin disk: Is there a distinct thick disk?
Authors: Kawata D. , Chiappini C. 
Published: September 2016

AbstractThis article is based on our discussion session on Milky Way models at the 592 WE‐Heraeus Seminar, Reconstructing the Milky Way's History: Spectroscopic Surveys, Asteroseismology and Chemodynamical Models. The discussion focused on the following question: “Are there distinct thick and thin disks?”. The answer to this question depends on the definition one adopts for thin and thick disks. The participants of this discussion converged to the idea that there are at least two different types of disks in the Milky Way. However, there are still important open questions on how to best define these two types of disks (chemically, kinematically, geometrically or by age?). The question of what is the origin of the distinct disks remains open. The future Galactic surveys which are highlighted in this conference should help us answering these questions. The almost one‐hour debate involving researchers in the field representing different modelling approaches (Galactic models such as TRILEGAL, Besançon and Galaxia, chemical evolution models, extended distribution functions method, chemodynamics in the cosmological context, and self‐consistent cosmological simulations) illustrated how important is to have all these parallel approaches. All approaches have their advantages and shortcomings (also discussed), and different approaches are useful to address specific points that might help us answering the more general question above.
Asteroseismology's new constraints on stellar models and Galactic Archaeology: Where are we now and where are we going?
Authors: Noels A. , Montalbán J. , Chiappini C. 
Published: September 2016

AbstractAfter a short introduction describing the whys and wherefores of the recent and growing interaction between Milky Way physicists, stellar evolution physicists, chemical abundances physicists, and asteroseismologists, which forms the ground of this workshop, we address some important points affecting the levels of accuracy on global stellar parameters, such as mass, radius, and age, which were raised during the final discussion of the workshop. We recall how asteroseismic parameters, especially when coupled with spectroscopy and photometry, greatly help to reduce uncertainties. We show how poorly known physical aspects, such as diffusion, rotation, and outer physical conditions, must however be kept in mind when assessing these uncertainties. We then summarise the huge advance in terms of spectroscopic follow‐up of seismic targets that took place in the last couple of years opening the doors for the first results in Galactic Archaeology making use of seismic distances, masses, radii, and ages. We conclude by presenting two tables: (1) an update of the table of uncertainties built at the Sesto workshop in 2013, and (2) a similar table with what should be reached for Galactic Archaeology purposes.
Preserving enzymatic activity and enhancing biochemical stability of glutathione transferase by soluble additives under free and tethered conditions
Authors: Karamitros Christos S. , Labrou Nikolaos E. 
Published: September 2016

AbstractIn the present study, we report the effect of four different soluble additives (sucrose, lactitol, superfloc c577, and dextran sulfate) on the stability of glutathione transferase 1 enzyme from Zea mays (ZmGSTF1‐1) under free and tethered conditions at 4 and 25 °C. Among all additives, the best stabilizing effects were observed in the case of superfloc c577 and sucrose at both tested temperatures, yet at distinct concentrations at each condition. Those two stabilizing agents were further combined and potential positive synergistic effects were investigated. In addition, we assessed the long‐term storage and operational stability of ZmGSTF1‐1 under tethered conditions in the presence of additives, which provided the most conducive effects on its stability under free conditions. Our results strongly suggest that the presence of additives may be beneficial to the stability of the enzyme under both free and tethered conditions. Thermodynamic analysis of the free enzyme in the presence of sucrose, which exhibited the best stabilizing effect at both temperatures, shed light on the possible mechanism of action. Given the considerable importance of the development of GST‐based biosensors with prolonged stability, the present work may be of general interest to researchers in the field of applied enzymology.
Improved heterologous production of the nonribosomal peptide‐polyketide siderophore yersiniabactin through metabolic engineering and induction optimization
Authors: Ahmadi Mahmoud Kamal , Pfeifer Blaine A. 
Published: September 2016

Biosynthesis of complex natural products like polyketides and nonribosomal peptides using Escherichia coli as a heterologous host provides an opportunity to access these molecules. The value in doing so stems from the fact that many compounds hold some therapeutic or other beneficial property and their original production hosts are intractable for a variety of reasons. In this work, metabolic engineering and induction variable optimization were used to increase production of the polyketide‐nonribosomal peptide compound yersiniabactin, a siderophore that has been utilized to selectively remove metals from various solid and aqueous samples. Specifically, several precursor substrate support pathways were altered through gene expression and exogenous supplementation in order to boost production of the final compound. The gene expression induction process was also analyzed to identify the temperatures and inducer concentrations resulting in highest final production levels. When combined, yersiniabactin production was extended to ∼175 mg L−1. © 2016 American Institute of Chemical Engineers Biotechnol. Prog., 32:1412–1417, 2016
Efficiency and safety of bivalirudin in patients undergoing emergency percutaneous coronary intervention via radial access: A subgroup analysis from the bivalirudin in acute myocardial infarction versus heparin and GPI plus heparin trial
Authors: Wang Heyang , Li Yi , Cong Hongliang , Ding Shifang , Liu Bin , Li Lu , Chen Yundai , Jia Shaobin , Jing Quanmin , Zhao Xin , Liu Haiwei , Liang Zhenyang , Li Jing , Bao Dan , Han Yaling 
Published: September 2016

Objectives: To explore the efficiency and safety of bivalirudin in patients undergoing emergency percutaneous coronary intervention via radial access.Background: Bivalirudin reduces bleeding risks over heparin in patients undergoing PCI. However, bleeding advantages of bivalirudin in patients undergoing transradial intervention is uncertain.Methods: In the BRIGHT trial, 1,723 patients underwent emergency PCI via radial access, with 576 patients in the bivalirudin arm, 576 in the heparin arm and 571 in the heparin plus tirofiban arm. The primary outcome was 30‐day net adverse clinical event (NACE), defined as a composite of major cardiac and cerebral events or any bleeding.Results: 30‐day NACE occurred in 5.7% with bivalirudin, 7.8% with heparin alone (vs. bivalirudin, P = 0.159), and 10.3% with heparin plus tifofiban (vs. bivalirudin, P = 0.004). The 30‐day bleeding rate was 0.9% for bivalirudin, 2.3% for heparin (vs. bivalirudin, P = 0.057), and 5.8% for heparin plus tirofiban (vs. bivalirudin, P < 0.001). Major cardiac and cerebral events (4.9 vs. 5.7 vs. 4.6%, P = 0.899), stent thrombosis (0.5 vs. 0.5 vs. 0.7%, P = 0.899) and acquired thrombocytopenia (0.2 vs. 0.5 vs. 0.9%, P = 0.257) at 30 days were similar among three arms. The interaction test for PCI access and randomized treatment showed no significance on all bleeding (P > 0.05).Conclusions: The bleeding benefit of bivalirudin was independent of artery access. Bivalirudin lead to statistical reduction on bleeding risks in comparison to heparin plus tirofiban, and only small numerical difference in comparison to heparin, with comparable risks of ischemic events and stent thrombosis in patients with acute myocardial infarction (AMI) undergoing emergency transradial PCI. © 2016 Wiley Periodicals, Inc.
ChemInform Abstract: YCa3(CrO)3(BO3)4: A Cr3+ Kagome Lattice Compound Showing No Magnetic Order Down to 2 K.
Authors: Wang Chun‐Hai , Avdeev Maxim , Kennedy Brendan J. , Kuepers Michael , Ling Chris D. 
Published: September 2016

AbstractPolycrystalline gaudefroyite‐type YCa3(CrO)3(BO3)4 with Cr3+ ions (3d3, S = 3/2) forming an undistorted Kagome lattice is prepared by reaction of a stoichiometric mixture of Y2O3, CaCO3, Cr2O3, H3BO3 in a KCl flux (Al2O3 crucible, 1000 °C, 1 d) followed by re‐grinding and further annealing (1000 °C, 2 d, 95% yield).
ChemInform Abstract: Polymorphism in Zintl Phases ACd4Pn3: Modulated Structures of NaCd4Pn3 with Pn: P, As.
Authors: Grotz Carolin , Baumgartner Maximilian , Freitag Katharina M. , Baumer Franziska , Nilges Tom 
Published: September 2016

AbstractSingle crystals of NaCd4P3 and NaCd4As3 are prepared by short‐way transport from stoichiometric amounts of the elements using CdI2 as mineralizer (evacuated silica tubes, 973 K, 4—7 d).
ChemInform Abstract: An Exhaustive Symmetry Approach to Structure Determination: Phase Transitions in Bi2Sn2O7.
Authors: Lewis James W. , Payne Julia L. , Evans Ivana Radosavljevic , Stokes Harold T. , Campbell Branton J. , Evans John S. O. 
Published: September 2016

AbstractAn automated and exhaustive symmetry‐mode method is presented for systematically exploring and solving symmetry‐lowering structural phase transitions that is widely applicable to a range of functional materials.
ChemInform Abstract: Stable Calcium Nitrides at Ambient and High Pressures.
Authors: Zhu Shuangshuang , Peng Feng , Liu Hanyu , Majumdar Arnab , Gao Tao , Yao Yansun 
Published: September 2016

AbstractIn view of N bonding and its applications in energy storage, new possible structures in addition to the known crystalline forms CaN2, Ca2N, and Ca3N2 are identified via a swarm intelligence structure search in theoretical exploration of the CaNx phase diagram.
ChemInform Abstract: Temperature‐Independent, Large Dielectric Constant Induced by Vacancy and Partial Anion Order in the Oxyfluoride Pyrochlore Pb2Ti2O6‐δF2δ.
Authors: Oka Kengo , Hojo Hajime , Azuma Masaki , Oh‐ishi Katsuyoshi 
Published: September 2016

AbstractThe A2B2X6X′0.5‐type pyrochlore Pb2Ti2O5.4F1.2 is prepared as a single phase by solid state reaction of stoichiometric amounts of PbO, PbF2, and TiO2 (evacuated Pyrex tubes, 873 K, 12 h).
ChemInform Abstract: Stereoselective Arene‐Forming Aldol Condensation: Synthesis of Axially Chiral Aromatic Amides.
Authors: Faeseke Vincent C. , Sparr Christof 
Published: September 2016

AbstractA convenient enantioselective synthesis of axially chiral carboxylic amides from homoallyl alkynes having an arylglyoxylic amide substituent is developed.
ChemInform Abstract: Synthesis of Homoallylic Amines and Acylhydrazides by Tin Powder‐Promoted Multicomponent One‐Pot Allylation Reactions.
Authors: Ma Junyan , Huang Danfeng , Wang Ke‐Hu , Xu Yanli , Chong Siying , Su Yingpeng , Fu Ying , Hu Yulai 
Published: September 2016

AbstractN‐Acylhydrazines are found to be more reactive than amines.They can not only react with aldehydes but also with ketones to give corresponding N‐homoallylic hydrides.
ChemInform Abstract: Decarboxylative Dearomatization and Mono‐α‐arylation of Ketones.
Authors: Mendis Shehani N. , Tunge Jon A. 
Published: September 2016

AbstractThe first example of a palladium‐catalyzed decarboxylative dearomatization reaction that occurs via Pd‐π‐benzyl intermediates is reported.
ChemInform Abstract: Palladium(II)‐Catalyzed Cross‐Dehydrogenative Coupling (CDC) of N‐Phthaloyl Dehydroalanine Esters with Simple Arenes: Stereoselective Synthesis of Z‐Dehydrophenylalanine Derivatives.
Authors: Bartoccini Francesca , Cannas Diego Maria , Fini Francesco , Piersanti Giovanni 
Published: September 2016

AbstractThe title reaction involves the cleavage of two sp2 C—H bonds followed by C—C bond formation, generating (Z)‐dehydrophenylalanine skeletons in a stereoselective and atom economical manner.
ChemInform Abstract: Asymmetric Cross‐ and Self‐Aldol Reactions of Aldehydes in Water with a Polystyrene‐Supported Triazolylproline Organocatalyst.
Authors: Llanes Patricia , Sayalero Sonia , Rodriguez‐Escrich Carles , Pericas Miquel A. 
Published: September 2016

AbstractA polystyrene‐supported triazolylproline is used as catalyst for the enantionselective cross‐aldol reaction and for the self‐aldol reaction of aldehydes.
ChemInform Abstract: 2‐Arylindoles: A New Entry to Transition Metal‐Free Synthesis of 2‐Aminobenzophenones.
Authors: Yu Jin , Moon Hye Ran , Min Beom Kyu , Kim Jae Nyoung 
Published: September 2016

AbstractAminobenzophenones (II) and aminoaryl alkyl ketones (IV) are synthesized starting from substituted indoles under O2 balloon atmosphere without the need of transition metal catalysts or organometallic reagents.
ChemInform Abstract: Enantioselective Sulfoxidation Catalyzed by a Bisguanidinium Diphosphatobisperoxotungstate Ion Pair.
Authors: Ye Xinyi , Moeljadi Adhitya Mangala Putra , Chin Kek Foo , Hirao Hajime , Zong Lili , Tan Choon‐Hong 
Published: September 2016

AbstractAn enantioselective tungstate‐catalyzed oxidation of heterocyclic or phenyl substituted sulfides is developed using H2O2 as the reagent and a chiral bisguanidinium catalyst.
ChemInform Abstract: Transfer of Electrophilic NH Using Convenient Sources of Ammonia: Direct Synthesis of NH Sulfoximines from Sulfoxides.
Authors: Zenzola Marina , Doran Robert , Degennaro Leonardo , Luisi Renzo , Bull James A. 
Published: September 2016

AbstractAn extremely useful method for the conversion of variously substituted sulfoxides to sulfoximines using ammonium carbamate as nitrogen source is reported.
ChemInform Abstract: Amino Acid‐Derived N‐Heterocyclic Carbene Palladium Complexes for Aqueous Phase Suzuki—Miyaura Couplings.
Authors: Steeples Elliot , Kelling Alexandra , Schilde Uwe , Esposito Davide 
Published: September 2016

AbstractFive novel PEPPSI‐type Pd‐NHC complexes are synthesized.
ChemInform Abstract: One‐Pot Synthesis of Nitronaphthalenes from Morita—Baylis—Hillman Acetates and Primary Nitroalkanes via Sequential SN2′‐Intramolecular Oxidative Nucleophilic Substitution of Hydrogen‐E2 Elimination.
Authors: Kim Su Yeon , Kim Ko Hoon , Min Beom Kyu , Kim Jimin , Kim Jae Nyoung 
Published: September 2016

AbstractPolysubstituted nitronaphthalenes are synthesized via the title reaction in moderate yields in an one‐pot procedure.
ChemInform Abstract: Microwave‐Assisted Synthesis of Functionalized Spirohydantoins as 3‐D Privileged Fragments for Scouting the Chemical Space.
Authors: Prevet Hugues , Flipo Marion , Roussel Pascal , Deprez Benoit , Willand Nicolas 
Published: September 2016

AbstractA wide variety of spirohydantoins are prepared via microwave‐assisted reactions of cyclic ketones with KCN and ammonium carbonate.
ChemInform Abstract: Iodine‐Catalyzed Regioselective Sulfenylation of Indoles with Thiols in Water.
Authors: He Yongqin , Liu Shengkang , Wen Ping , Tian Wanfa , Ren Xiaoyu , Zhou Qiangxiao , Ma Haojie , Huang Guosheng 
Published: September 2016

AbstractThe title reaction features broad substrate scope, mild reaction conditions, excellent regioselectivity, and excellent yields.
ChemInform Abstract: Synthesis of Novel Imidazopyrrolo‐Fused Isoxazole Derivatives Through Acid‐Mediated Intramolecular 1,3‐Dipolar Cycloaddition
Authors: Xu Yin , Wang Fukai , Li Jiling , Shao Xusheng , Xu Xiaoyong , Li Zhong 
Published: September 2016

Abstractstarting from various nitromethylene‐imidazolidine derivatives
ChemInform Abstract: Gold(I)‐Catalyzed Generation of the Two Components of a Formal [4 + 2] Cycloaddition Reaction for the Synthesis of Tetracyclic Pyrano[2,3,4‐de]chromenes.
Authors: Arto Tamara , Fananas Francisco J. , Rodriguez Felix 
Published: September 2016

AbstractA novel gold‐catalyzed cascade reaction of ortho‐alkynyl substituted salicylaldehydes with alkynylamines is developed to provide tetracyclic products (III) with excellent diastereoselectivity.
ChemInform Abstract: Utility of Ligand Effect in Homogenous Gold Catalysis: Enabling Regiodivergent π‐Bond‐Activated Cyclization.
Authors: Ding Dong , Mou Tao , Feng Minghao , Jiang Xuefeng 
Published: September 2016

AbstractA ligand‐assisted gold‐catalyzed regiodivergent intramolecular hydroarylation of alkynes by means of a directing group is described which tolerates various aryl, hetaryl and alkyl and even steroidal substituents.
ChemInform Abstract: Fast Regioselective Sulfonylation of Pyridine/Quinoline N‐Oxides Induced by Iodine
Authors: Wang Ruijia , Zeng Zebing , Chen Chuang , Yi Niannian , Jiang Jun , Cao Zhong , Deng Wei , Xiang Jiannan 
Published: September 2016

Abstractunder metal‐free conditions
ChemInform Abstract: Synthesis of Linker Isomers of Quinolin‐6‐yloxyacetamide Fungicides Through Newman—Kwart Rearrangement.
Authors: Kessabi Fiona Murphy , Quaranta Laura , Beaudegnies Renaud , Lamberth Clemens 
Published: September 2016

AbstractNovel quinolin‐6‐ylthioacetamides are prepared.
ChemInform Abstract: A Unique Annulation of 7‐Azaindoles with Alkenyl Esters to Produce π‐Conjugated 7‐Azaindole Derivatives.
Authors: Li Shuai‐Shuai , Liu Chen‐Fei , Xia Ying‐Qi , Li Wei‐Huan , Zhang Guo‐Tai , Zhang Xiao‐Mei , Dong Lin 
Published: September 2016

AbstractTetracyclic products are efficiently obtained by application of a base as key of the annulation reactions.
ChemInform Abstract: Ruthenium‐Catalyzed Enantioselective Hydrogenation of 1,8‐Naphthyridine Derivatives.
Authors: Ma Wenpeng , Chen Fei , Liu Youran , He Yan‐Mei , Fan Qing‐Hua 
Published: September 2016

AbstractThe first asymmetric hydrogenation of 2,7‐disubstituted naphthyridines is carried out by using phosphine‐free chiral cationic ruthenium diamine catalysts achieving good to excellent enantioselectivities.