bluuebunny/crossref_metadata_2025_split huggingface dataset:
Supplier Development Practices for Sustainability: A Multi‐Stakeholder Perspective
Authors: Liu Lingxuan , Zhang Min , Hendry Linda C. , Bu Maoliang , Wang Shi 
Published: November 2017

AbstractSupplier development for sustainability is a critical element of sustainable supply chain management and requires extensive multi‐stakeholder collaboration. This article establishes a conceptual four‐stage framework to analyse the collaborative mechanisms of supplier development practices, and presents an exploratory, qualitative analysis to identify the major contributors of sustainable supplier development practices, such as NGOs, industrial associations, consulting firms etc. Based on semi‐structured interviews about 63 organizations from different regions and industries, this article identifies three types of contributor: drivers, facilitators and inspectors. Instead of traditional stakeholder engagement processes, these contributors actively collaborate with buying firms and suppliers to design, implement and evaluate sustainable supplier development programs. The article then provides a matrix to describe the supply chain coverage and supplier performance of supplier development practices, given the absence or positive involvement of facilitators and inspectors. We conclude our study by suggesting future research directions as well as discussing managerial implications. Copyright © 2017 John Wiley & Sons, Ltd and ERP Environment
A computer game for teaching and learning algebra topics at undergraduate level
Authors: García Ivan , Cano Edgar 
Published: November 2017

AbstractTechnology is increasingly changing the way that engineering students are taught. In recent years, we have witnessed a significant growth in using computer game technologies for teaching and learning in different engineering fields and contexts. This approach offers the ability to create complex and highly interactive scenarios with a solid theoretical basis to teach material in new and highly interactive ways. This paper introduces the application of the game‐based learning approach and instructional design for creating a 2D computer game in order to support mathematics teaching and learning in the first‐year of an undergraduate engineering course. Additionally, an experiment was conducted on a Computer and Electronic Engineering course to evaluate the effects of the proposed game by following the “competency‐based learning” approach on students with sequential and global learning styles. The results showed that the computer game increased the learning experience and motivation of global learners when learning mathematical topics.
Tumor‐associated DNA mutation detection in individuals undergoing colonoscopy
Authors: Fleshner Phillip , Braunstein Glenn D. , Ovsepyan Gayane , Tonozzi Theresa R. , Kammesheidt Anja 
Published: November 2017

AbstractThe majority of colorectal cancers (CRC) harbor somatic mutations and epigenetic modifications in the tumor tissue, and some of these mutations can be detected in plasma as circulating tumor DNA (ctDNA). Precancerous colorectal lesions also contain many of these same mutations. This study examined plasma for ctDNA from patients undergoing a screening or diagnostic colonoscopy to determine the sensitivity and specificity of the ctDNA panel for detecting CRC and precancerous lesions. Two hundred patients without a history of nonskin cancer had blood drawn before a colonoscopy. Plasma ctDNA was measured with a 96 mutation panel for nine cancer driver genes. The ctDNA results were correlated with the findings at colonoscopy. Of the 200 patients, 176 (88%) had wild‐type DNA, 12 (6%) had mutations detected, and 12 (6%) had indeterminate results. Colonoscopy was normal in 80% of the patients and 20% were found to have polyps. No CRC was found in this study, precluding a determination of true‐positive rate for CRC detection. Our ctDNA panel was positive in 13.2% of patients with colonic polyps found at colonoscopy, while 4.7% of patients with normal colonoscopy also had ctDNA detected, which may represent ctDNA released from a benign process, an occult tumor, or an acquired somatic mutation from clonal hematopoiesis.
LncRNA UCA1 promotes proliferation and cisplatin resistance of oral squamous cell carcinoma by sunppressing miR‐184 expression
Authors: Fang Zheng , Zhao Junfang , Xie Weihong , Sun Qiang , Wang Haibin , Qiao Bin 
Published: November 2017

AbstractChemotherapy resistance has become the main obstacle for the effective treatment of human cancers. Long non‐coding RNA urothelial cancer associated 1 (UCA1) is generally regarded as an oncogene in some cancers. However, the function and molecular mechanism of UCA1 implicated in cisplatin (CDDP) chemoresistance of oral squamous cell carcinoma (OSCC) is still not fully established. UCA1 expression in tumor tissues and cells was tested by qRT‐PCR. MTT, flow cytometry and caspase‐3 activity analysis were explored to evaluate the CDDP sensitivity in OSCC cells. Western blot analysis was used to measure BCL2, Bax and SF1 protein expression. Luciferase reporter assay was conducted to investigate the molecular relationship between UCA1, miR‐184, and SF1. Nude mice model was used to confirm the functional role of UCA1 in CDDP resistance in vivo. UCA1 expression was upregulated in OSCC tissues, cell lines, and CDDP resistant OSCC cells. Function analysis revealed that UCA1 facilitated proliferation, enhanced CDDP chemoresistance, and suppressed apoptosis in OSCC cells. Mechanisms investigation indicated that UCA1 could interact with miR‐184 to repress its expression. Rescue experiments suggested that downregulation of miR‐184 partly reversed the tumor suppression effect and CDDP chemosensitivity of UCA1 knockdown in CDDP‐resistant OSCC cells. Moreover, UCA1 could perform as a miR‐184 sponge to modulate SF1 expression. The OSCC nude mice model experiments demonstrated that depletion of UCA1 further boosted CDDP‐mediated repression effect on tumor growth. UCA1 accelerated proliferation, increased CDDP chemoresistance and restrained apoptosis partly through modulating SF1 via sponging miR‐184 in OSCC cells, suggesting that targeting UCA1 may be a potential therapeutic strategy for OSCC patients
Total Synthesis and Antibacterial Study of Cyclohexapeptides Desotamide B, Wollamide B and Their Analogs
Authors: Chen Yi‐Xing , Liu Chao , Liu Nan , Wu Ye , Zhao Qing‐Jie , Hu Hong‐Gang , Li Xiang , Zou Yan 
Published: November 2017

As natural‐product‐derived antibiotics, desotamides A – D and wollamides exhibit growth inhibitory activity against Gram‐posivite bacteria (IC50 0.6 – 7 μm) and are noncytotoxic to mammalian cells (IC50 > 30 μm). Herein we firstly report the total synthesis of above two cyclohexapeptides as well as a series of structural variants through solid phase peptide synthesis, of which 3 displayed a 2‐fold increase of antibacterial activity when compared with the original peptide 1. This strategy may offer good improvements for the synthesis of other cyclic peptides.
Specificity of Donor Structures for endo‐β‐N‐Acetylglucosaminidase‐Catalyzed Transglycosylation Reactions
Authors: Ishii Nozomi , Ogiwara Ken , Sano Kanae , Kumada Jyunichi , Yamamoto Kenji , Matsuzaki Yuji , Matsuo Ichiro 
Published: November 2017

AbstractTo demonstrate the structural specificity of the glycosyl donor for the transglycosylation reaction by using endo‐β‐N‐acetylglucosaminidase from Mucor hiemalis (endo‐M), a series of tetrasaccharide oxazoline derivatives was synthesized. These derivatives correspond to the core structure of an asparagine‐linked glycoprotein glycan with a β‐mannose unit of a non‐natural‐type monosaccharide, including β‐glucose, β‐galactose, and β‐talose in place of the β‐mannose moiety. The transglycosylation activity of wildtype (WT) endo‐M and two mutants, N175Q and N175A, was examined by using these tetrasaccharide donors with p‐nitrophenyl N‐acetylglucosaminide (GlcNAc‐pNp). The essential configuration of the hydroxy group for the transglycosylation reaction was determined. On the basis of these results, the transglycosylation reaction was investigated by using chemically modified donors, and transglycosylated products were successfully obtained.
Ultrathin and Porous Carbon Nanosheets Supporting Bimetallic Nanoparticles for High‐Performance Electrocatalysis
Authors: Zhang Bingxing , Zhang Jianling , Tao Xiansen , Mei Qingqing , Zheng Lirong , Zhang Jing , Tan Xiuniang , Liu Chengcheng , Luo Tian , Cheng Xiuyan , Shi Jinbiao , Shao Dan , Sun Xiaofu , Zhu Qinggong , Zhang Li , Han Buxing 
Published: November 2017

AbstractDeveloping hybrid carbon materials with unique micro/nanostructured and multicomponent features is of great importance in catalysis, energy storage, and energy conversion. Herein, we demonstrate the formation of a novel kind of hybrid carbon material, that is, bimetallic nanoparticles supported by ultrathin (≈5.5 nm) and porous carbon nanosheets, by the pyrolysis of preformed bimetallic metal–organic framework nanosheets. This hybrid carbon nanostructure combines the advantages of highly exposed nanoparticles that are readily accessible to the reactant, multiple active sites such as metal–metal and metal–nitrogen sites and ultrathin carbon layers, and highly efficient electron transport. Owing to these unique features, the bimetallic carbon nanosheets exhibit excellent electrocatalytic performance for the oxygen reduction reaction.
Impact of time and temperature of storage on the spoilage of swordfish and the evolution of biogenic amines through a multiway model
Authors: Ortiz M.C. , Sanllorente S. , Herrero A. , Reguera C. , Sarabia L.A. 
Published: November 2017

AbstractA new multiway/multivariate approach is proposed to study and model the spoilage of swordfish with time and temperature of storage through the profiles of putrescine, spermidine, histamine, tyramine, tryptamine, cadaverine, spermine, and 2‐phenylethylamine. The evolution of these biogenic amines in food is a complex process that cannot be characterized by a single parameter but by a modification of the amine profiles. An experimental strategy is designed to determine these profiles in such a way that data are structurally 3‐way. Modeling the joint evolution of the biogenic amines with a PARAFAC model which explains 97.8% of variability (CORCONDIA index equals 100%) leads to estimate the storage time, storage temperature, and biogenic amines profiles. A multiple regression (determination coefficient of 0.98) based on the loadings of the 2 factors of the time profile of the PARAFAC model enables the estimation of the storage time with an error of 0.5 days.
Extraordinarily Large Ferromagnetic Coupling (J≥150 cm−1) by Electron Delocalization in a Heterometallic Mo≣Mo−Ni Chain Complex
Authors: Chipman Jill A. , Berry John F. 
Published: November 2017

AbstractThe new heterometallic chain compounds Mo2Ni(dpa)4Cl2 (1) and [Mo2Ni(dpa)4Cl2]OTf (2) (dpa=2,2′‐dipyridylamine) have been prepared and studied by crystallography and magnetic susceptibility, among other methods. Oxidation of 1 to 2 removes an electron from the multiply bonded Mo2 unit, consistent with the formulation of 2 containing a (Mo2)5+⋅⋅⋅(Ni)2+ core. While 1 contains an S=1, pseudo‐octahedral NiII ion, 2 has an S=3/2 ground state, in which the two NiII unpaired electrons, one in a localized δ‐orbital and one in a heavily delocalized σnb‐orbital are joined by an unpaired electron in a Mo−Mo δ‐orbital. The S=3/2 ground state is persistent to 300 K, evidencing strong ferromagnetic coupling of the Mo2 and Ni spins with J≥150 cm−1. This ferromagnetic interaction occurs via delocalization of a σnb‐electron across all three metal atoms, forcing ferromagnetic alignment of electrons in orthogonal Ni and Mo2 δ‐symmetry orbitals. We anticipate that this new means of coupling spins can be used as a design principle for the preparation of new compounds with high spin ground states.
Lewis Acid‐Assisted Photoinduced Intermolecular Coupling between Acylsilanes and Aldehydes: A Formal Cross Benzoin‐Type Condensation
Authors: Ishida Kento , Tobita Fumiya , Kusama Hiroyuki 
Published: November 2017

AbstractIntermolecular carbon–carbon bond‐forming reaction between readily available acylsilanes and aldehydes was achieved under photoirradiation conditions with assistance of a catalytic amount of Lewis acid. Nucleophilic addition of photochemically generated siloxycarbenes to aldehydes followed by 1,4‐silyl migration afforded synthetically useful α‐siloxyketones. Electrophilic activation of aldehydes by Lewis acid is highly important to realize this reaction efficiently, otherwise the yield of the desired coupling products were significantly decreased. Noteworthy is that a formal cross benzoin‐type reaction using acylsilanes was achieved under Lewis acidic conditions. This is the first example of Lewis acid‐catalyzed reaction of photochemically generated siloxycarbenes with electrophiles.
Nitromethane Bridged Bis(1,3,4‐oxadiazoles): Trianionic Energetic Salts with Low Sensitivities
Authors: Yu Qiong , Imler Gregory H. , Parrish Damon A. , Shreeve Jean'ne M. 
Published: November 2017

AbstractTrianionic energetic salts based on one nitromethylene and two dinitromethyl anions were designed and synthesized. Interestingly, the unstable dinitromethylene group of diethyl 2,2′‐((dinitromethylene)bis(1,3,4‐oxadiazole‐5,2‐diyl))bis(2,2‐dinitroacetate) (2) was changed to a mononitromethylene group by an aminolysis reaction to form triammonium ((nitromethanidylene)bis(1,3,4‐oxadiazole‐5,2‐diyl))bis(dinitromethanide) (3), whereas in (dinitrobis(5‐(trinitromethyl)‐1,3,4‐oxadiazol‐2‐yl)methan) 8 it was hydrolyzed to a carbonyl group resulting in (bis(5‐(trinitromethyl)‐1,3,4‐oxadiazol‐2‐yl)methanone) 9. All the new compounds were fully characterized by infrared, multinuclear NMR spectra, and elemental analysis. The structures of triammonium ((nitromethanidylene)bis(1,3,4‐oxadiazole‐5,2‐diyl))bis(dinitromethanide) dihydrate (3⋅2 H2O) and bis(2‐dinitromethyl‐1,3,4‐oxadiazole‐5‐yl)methanone (9) were further confirmed by single‐crystal X‐ray diffraction analysis. Based on their different physical and detonation properties, some of the energetic salts were found to exhibit good energetic performance and low sensitivity.
Effective sludge dewatering technique using the combination of Fenton's reagent and CPAM
Authors: Sun Wenquan , Tang Mengdan , Sun Yongjun , Xu Yanhua , Zheng Huaili 
Published: November 2017

AbstractIn this study, the combination of Fenton's reagent and cationic polyacrylamide (CPAM) was used in sludge conditioning for the enhancement of sludge dewatering performance. The effects of CPAM, H2O2, and Fe2+dosages and pH on the moisture content (MC) of the filter cake, the specific resistance of filtration (SRF), and the residual turbidity of the supernatant (RT) were investigated. To observe influencing mechanisms of sludge dewatering further, optical microscopy and scanning electron microscopy (SEM) were employed. Results demonstrated that the sludge dewatering performance obtained by the combination of Fenton's reagent and CPAM was significantly better than that obtained using Fenton's reagent or CPAM alone. The optimum conditions of sludge conditioning were as follows: 400 mg · L−1Fe2+, 4 g · L−1H2O2, 40 mg · L−1CPAM, and pH 4. The SRF, MC, and RT at optimum conditions were reduced to minimum values of 1.06 × 1012 m/kg, 58.9 %, and 3.7, respectively. The optical microscopy and SEM analyses of sludge flocs confirmed that they were more conducive to sludge dewatering after the combination of Fenton oxidation and flocculation. The sludge dewatering results demonstrated that the combination of Fenton and flocculation process exhibited excellent performance in enhancing sludge dewatering and is a promising pretreatment approach to sludge disposal.
Data‐driven reduced‐order model of microtubule mechanics
Authors: Feng Yan , Mitran Sorin 
Published: November 2017

AbstractA beam element is constructed for microtubules based upon data reduction of the results from atomistic simulation of the carbon backbone chain of
‐tubulin dimers. The database of mechanical responses to various types of loads from atomistic simulation is reduced to dominant modes. The dominant modes are subsequently used to construct the stiffness matrix of a beam element that captures the anisotropic behavior and deformation mode coupling that arises from a microtubule's spiral structure. In contrast to standard Euler–Bernoulli or Timoshenko beam elements, the link between forces and node displacements results not from hypothesized deformation behavior, but directly from the data obtained by molecular scale simulation. Differences between the resulting microtubule data‐driven beam model (MTDDBM) and standard beam elements are presented, with a focus on coupling of bending, stretch, shear deformations. The MTDDBM is just as economical to use as a standard beam element, and allows accurate reconstruction of the mechanical behavior of structures within a cell as exemplified in a simple model of a component element of the mitotic spindle.
Electrodeposited Poly(thieno[3,2‐b]thiophene) Films for the Templateless Formation of Porous Structures by Galvanostatic and Pulse Deposition
Authors: Ramos Chagas Gabriela , Akbari Raziyeh , Godeau Guilhem , Mohammadizadeh Mohammadreza , Guittard Frédéric , Darmanin Thierry 
Published: November 2017

AbstractThe formation of porous nanostructures by using a templateless electropolymerization process with thieno[3,2‐b]thiophene as a monomer and two different deposition methods (galvanostatic and pulse potentiostatic deposition) has been studied. The wettability, roughness, and morphology of the surfaces are reported. The surfaces prepared by galvanostatic deposition show hydrophilic behavior (θw≈80°) that is highly dependent on the roughness. Nanoseeds were formed in the first instances followed by the formation of large microcapsules and hollow spheres. Indeed, as the deposition time and current density increase, the size and amount of structures also increase. By pulse deposition, the surfaces are hydrophobic (θw≈100°) and only show a roughness dependence if the mean surface roughness is >1.5 μm. The surfaces are formed from nanodomes and nanospheres, but they are less structured than that of surfaces produced by the galvanostatic method. The formation of these structures is directly related to the amount of gas released from trace water in situ during electropolymerization, which is highly dependent on the electrochemical method chosen. The formation of new seeds is highly favored by the galvanostatic method, whereas their growth is favored by the pulse deposition method. This is the first study on the use of galvanostatic and pulse deposition methods, with potential applications in surface chemistry. Thieno[3,2‐b]thiophene proved to be very versatile to form different structures with potential applications as water harvesting and separation membranes.
Light‐Harvesting Antennae using the Host–Guest Chemistry of Mesoporous Organosilica
Authors: Cucinotta Fabio , Jarman Benjamin P. , Caplan Calvin , Cooper Sharon J. , Riggs Helen J. , Martinelli Jonathan , Djanashvili Kristina , La Mazza Emanuele , Puntoriero Fausto 
Published: November 2017

AbstractThis study presents two series of new host–guest chromophoric systems, where BODIPY dyes are organized into mesoporous silica. The dyes self‐assemble with surfactants to generate micellar templates that can direct the formation of the silica networks. The materials were characterized by means of small‐angle X‐ray scattering (SAXS) and transmission electron microscopy (TEM) to elucidate their structure, and by UV/Vis absorption spectroscopy to determine their optical properties. Dye‐loaded COK‐12 materials retain an ordered structure and exhibit a green fluorescence that slightly red‐shifts and undergoes quenching as the dye loading increases. A second system is based on MCM‐41 silica and works as a polychromatic antenna, where a high energy species forms within the template and drive excitation energy transfer in timescales down to 20 ps. Such systems show promising performances for the realization of photonic antennae, to be used as sensitizers for solar cells and photocatalytic devices.
Understanding Two Different Structures in the Dark Stable State of the Oxygen‐Evolving Complex of Photosystem II: Applicability of the Jahn–Teller Deformation Formula
Authors: Shoji Mitsuo , Isobe Hiroshi , Tanaka Ayako , Fukushima Yoshimasa , Kawakami Keisuke , Umena Yasufumi , Kamiya Nobuo , Nakajima Takahito , Yamaguchi Kizashi 
Published: November 2017

AbstractTanaka et al. (J. Am. Chem. Soc., 2017, 139, 1718) recently reported the three‐dimensional (3D) structure of the oxygen evolving complex (OEC) of photosystem II (PSII) by X‐ray diffraction (XRD) using extremely low X‐ray doses of 0.03 and 0.12 MGy. They observed two different 3D structures of the CaMn4O5 cluster with different hydrogen‐bonding interactions in the S1 state of OEC keeping the surrounding polypeptide frameworks of PSII the same. Our Jahn–Teller (JT) deformation formula based on large‐scale quantum mechanics/molecular mechanics (QM/MM) was applied for these low‐dose XRD structures, elucidating important roles of JT effects of the MnIII ion for subtle geometric distortions of the CaMn4O5 cluster in OEC of PSII. The JT deformation formula revealed the similarity between the low‐dose XRD and damage‐free serial femtosecond X‐ray diffraction (SFX) structures of the CaMn4O5 cluster in the dark stable state. The extremely low‐dose XRD structures were not damaged by X‐ray irradiation. Implications of the present results are discussed in relation to recent SFX results and a blue print for the design of artificial photocatalysts for water oxidation.
A systematic approach to designing a wide‐current range, MOS capacitor‐based switched‐capacitor DC‐DC converter with an augmenting LDO
Authors: Dogan Hakan , El‐Sayed Mohammed Shady A. 
Published: November 2017

SummarySwitched‐capacitor DC‐DC converters (SC DC‐DC) are analyzed for loss sources, voltage regulation integrity, start‐up latency, and ripple size, while the trade‐offs between these metrics are derived. These analyses are used to design a SC DC‐DC that achieves high efficiency in a wide load current range. Four‐way interleaving was employed to reduce the output ripple and efficiency loss due to this ripple. The design can be reconfigured to achieve gains of 1/3 and 2/5 for inputs ranging between 1.4 and 3.6 V to generate output voltage range of 0.4 to 1.27 V and can supply peak load current of 22 mA. It uses thin‐oxide MOS capacitors for their high density and achieves 75.4% peak efficiency with an input frequency of 100 MHz and a load capacitor of 10 nF. An augmenting LDO that only regulates during sudden load transients helps the converter respond fast to these transients. The chip was implemented using a 65‐nm standard CMOS process.