bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sustainable Purchasing in Food Retailing: Interorganizational Relationship Management to Green Product Supply
Authors: Chkanikova Olga 
Published: February 2015

AbstractStakeholders’ demands for product sustainability redefine the focus of corporate purchasing strategies from the traditional concern with financial performance to considerations of ‘triple bottom line’ viability. This adds to the complexity of managing interorganizational relationships and poses a question regarding corporate ability to effectively leverage suppliers over environmental and social performance of supplied goods. Since it is not clear what type of purchasing relationship is more favorable for greening a product supply, the current paper aims to investigate how food retailers manage their relationships with suppliers in order to influence the environmental and social performance of procured goods and improve the availability of sustainably produced supply. The research is based on two case studies of Swedish supermarkets and supplementary semi‐structured interviews with Swedish, British and Danish supermarkets. The results of the study contribute to the existing body of academic knowledge in the field of sustainable supply chain management by developing a typology of sustainable purchasing relationships with detailed insights into the nature of collaborative practices, structure of incentives, sustainability ambition, and approaches to verification of compliance. The study has also revealed the dependence of sustainable purchasing relationships on the characteristics of the procurement context, namely the presence of well‐established sustainability certification schemes, perceived by purchaser's situation with availability of sustainability certified supply and purchaser's interpretation of the state of power dependence in relationships with suppliers. Copyright © 2015 John Wiley & Sons, Ltd and ERP Environment
Roles of MoS2 and Graphene as Cocatalysts in the Enhanced Visible‐Light Photocatalytic H2 Production Activity of Multiarmed CdS Nanorods
Authors: Lang Di , Shen Tingting , Xiang Quanjun 
Published: February 2015

AbstractThe incorporation of cocatalysts into semiconductors is proved to be an effective approach to improving the efficiency of the photocatalytic H2 production. Noble metals such as Pt have been widely used as cocatalysts and can significantly improve the performance of photocatalytic H2 production. However, owing to the high cost and low abundance, the use of Pt in practical applications is restricted. Herein, we report two well‐known 2 D layered materials, MoS2 and graphene, as highly active cocatalysts for H2 production in CdS‐based photocatalytic systems. The CdS–MoS2 and CdS‐MoS2–graphene nanocomposites were prepared by using a facile two‐step solvothermal method, and the morphologies of CdS and MoS2 can be well controlled. The as‐prepared binary CdS–MoS2 nanocomposite exhibits the enhanced visible‐light photocatalytic activity for H2 production in lactic acid aqueous solution compared with a CdS–graphene nanocomposite and a conventional platinized CdS photocatalyst. Moreover, the ternary CdS–MoS2–graphene nanocomposite achieves the highest visible‐light photocatalytic H2 production activity of 621.3 μmol h−1 and the apparent quantum efficiency of 54.4 % at λ=420 nm. The enhanced photocatalytic activity of the CdS–MoS2–graphene nanocomposite can be primarily attributed to the positive synergistic effect between graphene sheets and thin MoS2 nanoplates. The graphene sheets can accelerate the efficient electron transfer from CdS nanorods to the active edge sites of MoS2 nanoplates, and the nanosized MoS2 can facilitate the photogenerated electrons participating in the photocatalytic H2 production. The mechanisms for improving the photocatalytic performance of the MoS2‐ and/or graphene‐modified CdS nanocomposites were proposed by using the electrochemical analysis and photoluminescence measurement.
Mycotoxin Aptasensing Amplification by using Inherently Electroactive Graphene‐Oxide Nanoplatelet Labels
Authors: Loo Adeline Huiling , Bonanni Alessandra , Pumera Martin 
Published: February 2015

AbstractWe develop an electrochemical aptasensor for ochratoxin A (OTA) by utilizing graphene‐oxide nanoplatelets (GONPs) as electroactive labels. OTA aptamer (OTA‐apt), which serves as the recognition element, was first immobilized onto the electrode surface before the modified electrode underwent exposure to OTA. Subsequently, incubation with GONPs was performed and the nanoplatelets conjugated to the immobilized OTA‐apt through π–π interactions. The principle of detection lies in the ability of these nanoplatelets to be electrochemically reduced, thereby producing a well‐defined reduction peak that was then employed as the analytical signal. The fabricated aptasensor is capable of detecting OTA in the concentration range of 310 fM to 310 pM, with good selectivity against common interferences. The obtained results from this study have the potential to contribute towards the aim of developing a biosensor for OTA, with high selectivity and sensitivity.
Supramolecular Assembly of Achiral Alkynylplatinum(II) Complexes and Carboxylic β‐1,3‐Glucan into Different Helical Handedness Stabilized by Pt⋅⋅⋅Pt and/or π–π Interactions
Authors: Chung Clive Yik‐Sham , Tamaru Shun‐ichi , Shinkai Seiji , Yam Vivian Wing‐Wah 
Published: February 2015

AbstractTwo‐component ensembles of alkynylplatinum(II) terpyridine (tpy) complexes and carboxylic β‐1,3‐glucan (CurCOOH) have been investigated by using spectroscopic and microscopic techniques, as well as time‐dependent UV/Vis absorption and circular dichroism (CD) experiments. Microscopic images of [Pt(tpy){CCC6H4(CH2NMe3‐4)}](OTf)2 (1) have revealed spherical nanostructures, whereas helical fibrous structures of different lengths, depending on the concentration of complex 1 and CurCOOH, were observed. The helical assemblies have been found to show low‐energy metal‐metal‐to‐ligand charge transfer (MMLCT) absorption and triplet MMLCT (3MMLCT) emission, which are indicative of Pt⋅⋅⋅Pt and/or π–π interactions between the complex 1 molecules. Interestingly, the ensemble has been demonstrated to show different handedness and even a change in handedness over time under different experimental conditions. Low temperatures, low concentrations of CurCOOH, high concentrations of complex 1, or successive addition of CurCOOH into complex 1 solution favor the formation of right‐handed helical assemblies, whereas high temperatures, high concentrations of CurCOOH, low concentrations of complex 1, or single‐batch addition of CurCOOH into complex 1 solution result in a fast chiroptical inversion of the ensemble solution, giving rise to the left‐handed helical assemblies as the dominant species. The results have been rationalized by considering the competing kinetically and thermodynamically controlled assembly–elongation of the ensemble, which leads to the formation of right‐handed and left‐handed helical assemblies, respectively. The change in the handedness of the ensemble has been demonstrated to stem from the formation of two‐component assemblies with supramolecular interactions, in contrast to the template‐ induced chiral amplification commonly observed in other systems.
Palladium‐Catalyzed Annulation of 9‐Halophenanthrenes with Alkynes: Synthesis, Structural Analysis, and Properties of Acephenanthrylene‐Based Derivatives
Authors: Liu En‐Chih , Chen Min‐Kuan , Li Jen‐Yi , Wu Yao‐Ting 
Published: February 2015

AbstractThe palladium‐catalyzed annulation of 9‐bromo‐ and 9‐chlorophenanthrenes with alkynes gave 4,5‐disubstituted acephenanthrylenes in yields of 58–95 % (9 examples). Asymmetric alkynes, such as 1‐phenyl‐1‐propyne, 1‐phenyl‐1‐hexyne, and 1‐cyclopropyl‐2‐phenylethyne, regioselectively form (cyclo)alkyl‐substituted products, following the regular rule that governs the carbopalladation of alkynes. This synthetic protocol can also be utilized in annulations with several π‐extended bromoarenes, such as 7‐bromo[5]helicene, 5‐bromo[4]helicene, 9‐bromoanthracene, 3‐bromoperylene, and 3‐bromofluoranthene, to give the corresponding annulated products in moderate to good yields (51–86 %; 6 examples). Similarly, bromocorannulene produced highly curved 1,2‐disubstituted cyclopentacorannulenes. Reactions of 6,12‐dibromochrysene and 4,7‐dibromo[4]helicene with di(4‐tolyl)ethyne provided the twofold annulated products in moderate yields. 4,5‐Diphenylacephenanthrylene and 6,7‐diphenylbenzo[a]acephenanthrylene thus generated were converted into phenanthro[9,10‐e]acephenanthrylene and benzo[a]phenanthro[9,10‐e]acephenanthrylene, respectively, by oxidative cyclodehydrogenation. The structures of 4,5‐diphenylacephenanthrylene, 4,5‐diphenyldibenzo[a,l]acephenanthrylene, 1,2‐diarylcyclopentacorannulenes, and benzo[a]phenanthro[9,10‐e]acephenanthrylene were verified by X‐ray crystallography. The photophysical and electrochemical properties of the selected annulated products were investigated.
Long‐Lived Charge Carriers in Mn‐Doped CdS Quantum Dots for Photoelectrochemical Cytosensing
Authors: Wu Peng , Pan Jian‐Bing , Li Xiang‐Ling , Hou Xiandeng , Xu Jing‐Juan , Chen Hong‐Yuan 
Published: February 2015

AbstractPhotoelectrochemical (PEC) biosensing with semiconductor quantum dots (QDs) has received great attention because it integrates the advantages of both photo‐excitation and electrochemical detection. During the photon‐to‐electricity conversion in PEC processes, electron–hole (charge) separation competes with electron–hole recombination, and the net effect essentially determines the performance of PEC biosensors. Herein, we propose a new approach for slowing down electron–hole recombination to increase charge separation efficiency for PEC biosensor development. Through doping with Mn2+, a pair of d bands (4T1 and 6A1) is inserted between the conduction and valence bands of CdS QDs, which alters the electron–hole separation and recombination dynamics, allowing the generation of long‐lived charge carriers with ms‐scale lifetime that decay about 104–105‐fold more slowly than in the case of undoped QDs. Photocurrent tests indicated that Mn2+ doping resulted in an approximately 80 % increase in photocurrent generation compared with undoped CdS QDs. For application, the Mn‐doped CdS QDs were coated on the surface of a glassy carbon electrode and functionalized with a cell surface carbohydrate‐specific ligand (3‐aminophenylboronic acid). In this way, a sensitive cytosensor for K562 leukemia cells was constructed. Moreover, the sugar‐specific binding property of 3‐aminophenylboronic acid allowed the electrode to serve as a switch for the capture and release of cells. This has been further explored with a view to developing a reusable PEC cytosensing platform.
Conceptual Quantum Chemical Analysis of Bonding and Noncovalent Interactions in the Formation of Frustrated Lewis Pairs
Authors: Skara Gabriella , Pinter Balazs , Top Jens , Geerlings Paul , De Proft Frank , De Vleeschouwer Freija 
Published: February 2015

AbstractThe contributions of covalent and noncovalent interactions to the formation of classical adducts of bulky Lewis acids and bases and frustrated Lewis pairs (FLPs) were scrutinized by using various conceptual quantum chemical techniques. Significantly negative complexation energies were calculated for fourteen investigated Lewis pairs containing bases and acids with substituents of various sizes. A Ziegler–Rauk‐type energy decomposition analysis confirmed that two types of Lewis pairs can be distinguished on the basis of the nature of the primary interactions between reactants; dative‐bond formation and concomitant charge transfer from the Lewis base to the acid is the dominant and most stabilizing factor in the formation of Lewis acid–base adducts, whereas weak interactions are the main thermodynamic driving force (>50 %) for FLPs. Moreover, the ease and extent of structural deformation of the monomers appears to be a key component in the formation of the former type of Lewis pairs. A Natural Orbital for Chemical Valence (NOCV) analysis, which was used to visualize and quantify the charge transfer between the base and the acid, clearly showed the importance and lack of this type of interaction for adducts and FLPs, respectively. The Noncovalent Interaction (NCI) method revealed several kinds of weak interactions between the acid and base components, such as dispersion, π–π stacking, CH⋅⋅⋅π interaction, weak hydrogen bonding, halogen bonding, and weak acid–base interactions, whereas the Quantum Theory of Atoms in Molecules (QTAIM) provided further conceptual insight into strong acid–base interactions.
Pyrene‐Based Dyad and Triad Leading to a Reversible Chemical and Redox Optical and Magnetic Switch
Authors: Franco Carlos , Mas‐Torrent Marta , Caballero Antonio , Espinosa Arturo , Molina Pedro , Veciana Jaume , Rovira Concepció 
Published: February 2015

AbstractTwo new pyrene–polychlorotriphenylmethyl (PTM) dyads and triads have been synthesized and characterized by optical, magnetic, and electrochemical methods. The interplay between the different electronic states of the PTM moiety in the dyads and triads and the optical and magnetic properties of the molecules have been studied. The electronic spectra of the radicals 5. and 6. show the intramolecular charge‐transfer transition at around 700 nm due to the acceptor character of the PTM radical. In the diamagnetic protonated derivatives 3 and 4 the fluorescence due to the pyrene is maintained, whereas in the radicals 5. and 6. and the corresponding anions 5− and 6− there is a clear quenching of the fluorescence, which is more efficient in the case of radicals. The redox activity of PTM radicals that are easily reduced to the corresponding carbanion has been exploited to fabricate electrochemical switches with optical and magnetic response.
Boron‐Doped, Carbon‐Coated SnO2/Graphene Nanosheets for Enhanced Lithium Storage
Authors: Liu Yuxin , Liu Ping , Wu Dongqing , Huang Yanshan , Tang Yanping , Su Yuezeng , Zhang Fan , Feng Xinliang 
Published: February 2015

AbstractHeteroatom doping is an effective method to adjust the electrochemical behavior of carbonaceous materials. In this work, boron‐doped, carbon‐coated SnO2/graphene hybrids (BCTGs) were fabricated by hydrothermal carbonization of sucrose in the presence of SnO2/graphene nanosheets and phenylboronic acid or boric acid as dopant source and subsequent thermal treatment. Owing to their unique 2D core–shell architecture and B‐doped carbon shells, BCTGs have enhanced conductivity and extra active sites for lithium storage. With phenylboronic acid as B source, the resulting hybrid shows outstanding electrochemical performance as the anode in lithium‐ion batteries with a highly stable capacity of 1165 mA h g−1 at 0.1 A g−1 after 360 cycles and an excellent rate capability of 600 mA h g−1 at 3.2 A g−1, and thus outperforms most of the previously reported SnO2‐based anode materials.
Anisotropic Expansion of an M2L4 Coordination Capsule: Host Capability and Frame Rearrangement
Authors: Yamashina Masahiro , Yuki Tsubasa , Sei Yoshihisa , Akita Munetaka , Yoshizawa Michito 
Published: February 2015

AbstractAnisotropic expansion of a spherical M2L4 coordination capsule through the elongation of the ligand led to a new M2L′4 capsule. The expanded capsule provides an elliptical cavity encircled by polyaromatic frameworks with large openings and thereby can encapsulate elliptical fullerene C70 and monofunctionalized fullerene C60 in high yields. In addition, selective formation of a new M2L2L′2 capsule occurs by mixing the original M2L4 and expanded M2L′4 capsules in a 1:1 ratio upon addition of C60 or monofunctionalized C60 as a template molecule.
Chemistry of Stannylene‐Based Lewis Pairs: Dynamic Tin Coordination Switching Between Donor and Acceptor Character
Authors: Krebs Kilian M. , Freitag Sarah , Schubert Hartmut , Gerke Birgit , Pöttgen Rainer , Wesemann Lars 
Published: February 2015

AbstractThe coordination chemistry of cyclic stannylene‐based intramolecular Lewis pairs is presented. The P→Sn adducts were treated with [Ni(COD)2] and [Pd(PCy3)2] (COD=1,5‐cyclooctadiene, PCy3=tricyclohexylphosphine). In the isolated coordination compounds the stannylene moiety acts either as an acceptor or a donor ligand. Examples of a dynamic switch between these two coordination modes of the PSn ligand are illustrated and the structures in the solid state together with heteronuclear NMR spectroscopic findings are discussed. In the case of a Ni0 complex, 119Sn Mössbauer spectroscopy of the uncoordinated and coordinated phosphastannirane ligand is presented.
Catalytic Aerobic Oxidation and Tandem Enantioselective Cycloaddition in Cascade Multicomponent Synthesis
Authors: Potowski Marco , Merten Christian , Antonchick Andrey P. , Waldmann Herbert 
Published: February 2015

AbstractAn efficient multicomponent cascade transformation for the highly diastereo‐ and enantioselective synthesis of complex natural product inspired polycyclic products from simple starting materials is described. The cascade is initiated by copper‐catalyzed aerobic CH oxidation of cyclopentadiene to cyclopentadienone followed by double catalytic asymmetric 1,3‐dipolar cycloaddition of azomethine ylides. The cascade synthesis efficiently yields structurally complex 5,5,5‐tricyclic products with eight stereocenters with good yields and excellent diastereo‐ and enantiocontrol using one catalyst.
Bestandsaufnahme zu Aufkommen und Nutzung biogener Reststoffe in der deutschen Lebensmittel‐ und Biotechnikindustrie
Authors: Mahro Bernd , Gaida Bente , Schüttmann Ina , Zorn Holger 
Published: February 2015

AbstractDie Intensivierung der Biomassenutzung als Energie‐ und Rohstoffträger führt zunehmend zu Nutzungskonflikten insbesondere im Hinblick auf die Sicherstellung einer ausreichenden Nahrungsmittelversorgung. Es ist deshalb wichtig, vor allem solche Biomasse‐Ressourcen möglichst effizient zu nutzen, die für eine unmittelbare Nahrungsmittelversorgung nicht in Frage kommen. Vor diesem Hintergrund wurden die pro Jahr in den verschiedenen Branchen der deutschen Lebensmittel‐ und Biotechnikindustrie anfallenden biogenen Reststoffe ermittelt. Diese biogenen Reststoffe beinhalten ein großes Potenzial für eine weitergehende stoffliche bzw. energetische Nutzung, werden derzeit aber primär im Bereich der Futtermittelherstellung verwertet.
Einfluss des Bindemittels und der Feuchtebeladung auf die Festigkeit von Zeolith 4A‐Granulaten
Authors: Müller Peter , Russell Alexander , Tomas Jürgen 
Published: February 2015

AbstractIn der vorliegenden Studie wurden das Materialverhalten und die Festigkeit eines bindemittelhaltigen und zweier bindemittelfreier zeolithischer Molekularsiebe in Granulatform untersucht. Die Proben wurden mittels einaxialem Druckversuch bei einer konstanten Beanspruchungsgeschwindigkeit bis zum Bruch untersucht. Die erhaltenen Kraft‐Weg‐Kurven wurden mit dem Modell nach Hertz bzw. nach Tomas ausgewertet. Zudem wurden die Bruchfestigkeits‐ und die spezifischen Bruchenergieverteilungen ermittelt. Der Einfluss des (temporären) Bindemittels bzw. des Bindemechanismus und unterschiedlicher Feuchtebeladungen auf die Produkteigenschaften der Granulate wird beschrieben.
Einflüsse der mechanischen Verfahrenstechnik auf die Herstellung von Elektroden für Lithium‐Ionen‐Batterien
Authors: Bitsch Boris , Willenbacher Norbert , Wenzel Valentin , Schmelzle Steffen , Nirschl Hermann 
Published: February 2015

AbstractMit der Intensivierung der Forschungsaktivitäten im Bereich der Energiespeicher hat die Lithium‐Ionen‐Batterie zunehmend an Bedeutung gewonnen. Im Herstellungsprozess spielt die Mechanische Verfahrenstechnik eine zentrale Rolle. Sowohl die Zusammensetzung der Elektrodenslurries als auch das Dispergierverfahren beeinflussen die Fließeigenschaften der Suspension und die Desagglomeration der feinskaligen Materialien maßgeblich. Wesentlicher Bestandteil der hier vorgestellten Experimente sind die rheologische Charakterisierung der prozessierten Slurries und die Beschreibung der Desagglomeration infolge variierender Spannungszustände während des Herstellungsprozesses. Es wird gezeigt, dass sich die Slurryqualität durch den Zusammenhang zwischen der Viskosität, der Prozessführung und der mechanischen Beanspruchung direkt beeinflussen lässt.
Mortality and Readmission Rates in Patients Hospitalized for Acute Decompensated Heart Failure: A Comparison Between Cardiology and General‐Medicine Service Outcomes in an Underserved Population
Authors: Selim Ahmed M. , Mazurek Jeremy A. , Iqbal Muhammad , Wang Dan , Negassa Abdissa , Zolty Ronald 
Published: February 2015

ABSTRACTBackgroundWith recent legislation imposing penalties on hospitals for above‐average 30‐day all‐cause readmissions for patients with acute decompensated heart failure (ADHF), there is concern these penalties will more heavily impact hospitals serving socioeconomically vulnerable and underserved populations.HypothesisPatients with ADHF and low socioeconomic status have better postdischarge mortality and readmission outcomes when cardiologists are involved in their in‐hospital care.MethodsWe retrospectively searched the electronic medical record for patients hospitalized for ADHF from 2001 to 2010 in 3 urban hospitals within a large university‐based health system. These patients were divided into 2 groups based on whether a cardiologist was involved in their care or not. Measured outcomes were 30‐ and 60‐day postdischarge mortality and readmission rates.ResultsOut of the 7516 ADHF patients, 1434 patients were seen by a cardiologist (19%). These patients had lower 60‐day mortality (5.4% vs 7.0%; hazard ratio [HR]: 0.70, 95% confidence interval [CI]: 0.52‐0.96, P = 0.034) and lower 30‐ and 60‐day readmission rates (16.7% vs 20.6%; HR: 0.76, 95% CI: 0.66‐0.89, P = 0.002, and 26.1% vs 30.2%; HR: 0.81, 95% CI: 0.72‐0.92, P = 0.003, respectively). There was no significant difference in the in‐hospital mortality between the 2 groups. Compared with other races, whites with systolic HF have marginally lower HF‐related readmission rates when treated by cardiologists.ConclusionsIn this cohort of ADHF patients from the Bronx, New York, involvement of a cardiologist resulted in improved short‐term mortality and readmission outcomes compared with treatment by general internal medicine.
Selective Inhibitors of Glutathione Transferase P1 with Trioxane Structure as Anticancer Agents
Authors: Bräutigam Maria , Teusch Nicole , Schenk Tobias , Sheikh Miriam , Aricioglu Rocky Z. , Borowski Swantje H. , Neudörfl Jörg‐Martin , Baumann Ulrich , Griesbeck Axel G. , Pietsch Markus 
Published: February 2015

AbstractThe response to chemotherapy in cancer patients is frequently compromised by drug resistance. Although chemoresistance is a multifactorial phenomenon, many studies have demonstrated that altered drug metabolism through the expression of phase II conjugating enzymes, including glutathione transferases (GSTs), in tumor cells can be directly correlated with resistance against a wide range of marketed anticancer drugs. In particular, overexpression of glutathione transferase P1 (GSTP1) appears to be a factor for poor prognosis during cancer therapy. Former and ongoing clinical trials have confirmed GSTP1 inhibition as a principle for antitumor therapy. A new series of 1,2,4‐trioxane GSTP1 inhibitors were designed via a type II photooxygenation route of allylic alcohols followed by acid‐catalyzed peroxyacetalization with aldehydes. A set of novel inhibitors exhibit low micromolar to high nanomolar inhibition of GSTP1, revealing preliminary SAR for further lead optimization. Importantly, high selectivity over another two human GST classes (GSTA1 and GSTM2) has been achieved. The trioxane GSTP1 inhibitors may therefore serve as a basis for the development of novel drug candidates in overcoming chemoresistance.