bluuebunny/crossref_metadata_2025_split huggingface dataset:
Food Derived Bioactive Peptides for Health Enhancement and Management of Some Chronic Diseases
Authors: Ogori A. F. , Girgih A. T. , Abu J. O. , Eke M. O. 
Published: May 2019

The bioactive peptides produced by enzymatic hydrolysis, acid hydrolysis and fermentation approach have been identified and used widely in research. These methods are important in enhancement or prevention and management of chronic diseases that are ravaging the world such as type -2-diabetes, hypertension, oxidative stress, cancer, and obesity. Sources of bioactive peptides have been established ranging from plant to animal and marine foods that have pharmacological effects; however these effects are dependent on target cells and peptides structure and conformations. Plants such as hemp and animal source such as milk among others validate the findings of In vitro and In-vivo studies and the efficiency of these bioactive peptides in the management of certain chronic diseases. This article reviews the literature on bioactive peptides with concern on food sources, production and bioactive peptides application in enhancement of health and management of hypertension, diabetes and oxidative stress. Future research efforts on bioactive peptides should be directed towards elucidating specific sequenced bioactive peptides and their molecular mechanisms, through In-vivo and In-vitro studies for specific health condition in human using nutrigenomics and peptideomic approaches.
Reducing Salinity Stress in Murcott Mandarin Orchards Using Different Soil Amendments
Authors: Abou-Baker Nesreen H. , Hamed Nadia A. , Abdel-Aziz R. A. , Salem A. S. 
Published: May 2019

Aims: The response of “Murcott” mandarin trees budded on Volkamer Lemon rootstock grown in salt-affected soil to different alleviating salinity stress additions was studied.
Study Design: This research was designed to fit The complete randomize block design (CRBD).
Place and Duration of Study: The present study was carried out in a private “Murcott” mandarin orchard located in “El-Adlia Association”, El-Sharqia Governorate, Egypt, during two successive seasons 2014/2015 and 2016/2017.
Methodology: Eight different treatments were used as follow: 1) Control, 2) Magnetite at 138 kg/ha (Mag, knowing that ha = 10000 m2), 3) Effective microorganisms at the rate of 12 L/ha. (EM), 4) Biotic at the rate of 12 L/ha. (B), 5) Mag+B, 6) Mag+EM, 7) B+EM and 8) Mag+B+EM.
Results: These different treatments mitigated salinity stress, reduced leaves osmotic pressure, thus increased fruit set, fruit yield, fruit quality, root distribution, photosynthetic pigments and mineral concentrations in leaves of Murcott trees compared with the control. Proline accumulations in fresh leaves, as well as soil pH and EC at the end of the two seasons also were recorded.
Conclusion: The combination between B and EM in the presence or absence of Mag enhanced the ability of mandarin to alleviate salt stress and produced the highest yield and fruit quality.
Factors Militating against Effective Teaching and Learning of Computer in Secondary Schools in Enugu State Nigeria
Authors: N Ogbonna Mercy. 
Published: May 2019

The teaching and learning of computers in secondary schools is very beneficial for preparation of students for more challenging education in the University. However, many factors militate against the effective computer education in the schools. This study sought to assess these factors in Enugu State Nigeria. Specifically it sought to assess teachers-related factors; students-related factors; government-related factors and school administrative factors that militate against effective teaching and learning of computer in the State. The study adopted survey research method and hundred questionnaires were used for the study. Data were analysed with the use of descriptive statistics (mean) in SPSS. Respondents agreed that teachers based factors that contribute to ineffective teaching and learning of computers in secondary schools included that teachers of the subject were unqualified (=2.9) and lack experience (=2.6). Students based included absenteeism by students (=2.7) and lack of interest by students (=2.7). Government based factors included that government provide voluminous curriculum (=2.9) and do not provide funds (=3.2). School administration based factors were that mismanagement of procured instructional materials (=2.9) and mis-use of provided funds (=2.9). This study concludes that students, teachers, government and school administration have important roles to play for effective teaching and learning of computer in secondary schools. For a way forward, the study recommends that government and individuals should encourage in and out of school computer education by establishing learning centres in the State. Computer teachers should always be provided with on-the-job training or re-training programmes. Government and school administration should as a matter of priority provide computer systems and other lacking instructional materials in their schools. Students should attend to classes and improve their interest in computer education.
Recent Advances in Applications of Sorted Single‐Walled Carbon Nanotubes
Authors: Bati Abdulaziz S. R. , Yu LePing , Batmunkh Munkhbayar , Shapter Joseph G. 
Published: May 2019

AbstractSingle‐walled carbon nanotubes (SWCNTs) exhibit outstanding properties that make them appealing in a wide range of applications. However, their properties are variable depending on the tube helicity (chirality), which has been a challenge for a long time and needs to be effectively controlled. In recent years, tremendous efforts have been made to control the electrical type/chirality of nanotubes through both direct controlled synthesis and postsynthesis separation methods. Driven by these breakthroughs, the applications of separated families of SWCNTs in various fields have emerged as a new topic of research. In this Review, an overview of recent advances in the use of highly purified and well‐separated SWCNTs in a comprehensive range of applications is presented including photovoltaics, transistors, batteries, sensors, light emitters, biological/medical fields, and others. Finally, important future directions for the utilization of separated SWCNTs in these fields are provided.
Properties of Excitons and Photogenerated Charge Carriers in Metal Halide Perovskites
Authors: Jiang Ying , Wang Xiao , Pan Anlian 
Published: May 2019

AbstractMetal halide perovskites (MHPs) have recently attracted great attention from the scientific community due to their excellent photovoltaic performance as well as their tremendous potential for other optoelectronic applications such as light‐emitting diodes, lasers, and photodetectors. Despite the rapid progress in device applications, a solid understanding of the photophysical properties behind the device performance is highly desirable for MHPs. Here, the properties of excitons and photogenerated charge carriers in MHPs are explored. The unique dielectric constant properties, crystal–liquid duality, and fundamental optical processes of MHPs are first discussed. The properties of excitons and related phenomena in MHPs are then detailed, including the exciton binding energy determined by various methods and their influence factors, exciton dynamics, exciton–photon coupling and related applications, and exciton–phonon coupling in MHPs. The properties of photogenerated free charge carriers in MHPs such as the carrier diffusion length, mobility, and recombination are described. Recent progress in various applications is also demonstrated. Finally, a conclusion and perspectives of future studies for MHPs are presented.
Defect‐Rich Heterogeneous MoS2/NiS2 Nanosheets Electrocatalysts for Efficient Overall Water Splitting
Authors: Lin Jinghuang , Wang Pengcheng , Wang Haohan , Li Chun , Si Xiaoqing , Qi Junlei , Cao Jian , Zhong Zhengxiang , Fei Weidong , Feng Jicai 
Published: May 2019

AbstractDesigning and constructing bifunctional electrocatalysts is vital for water splitting. Particularly, the rational interface engineering can effectively modify the active sites and promote the electronic transfer, leading to the improved splitting efficiency. Herein, free‐standing and defect‐rich heterogeneous MoS2/NiS2 nanosheets for overall water splitting are designed. The abundant heterogeneous interfaces in MoS2/NiS2 can not only provide rich electroactive sites but also facilitate the electron transfer, which further cooperate synergistically toward electrocatalytic reactions. Consequently, the optimal MoS2/NiS2 nanosheets show the enhanced electrocatalytic performances as bifunctional electrocatalysts for overall water splitting. This study may open up a new route for rationally constructing heterogeneous interfaces to maximize their electrochemical performances, which may help to accelerate the development of nonprecious electrocatalysts for overall water splitting.
Nanoionic Resistive‐Switching Devices
Authors: Zhu Xiaojian , Lee Seung Hwan , Lu Wei D. 
Published: May 2019

AbstractAdvances in the understanding of nanoscale ionic processes in solid‐state thin films have led to the rapid development of devices based on coupled ionic–electronic effects. For example, ion‐driven resistive‐switching (RS) devices have been extensively studied for future memory applications due to their excellent performance in terms of switching speed, endurance, retention, and scalability. Recent studies further suggest that RS devices are more than just resistors with tunable resistance; instead, they exhibit rich and complex internal ionic dynamics that equip them with native information‐processing capabilities, particularly in the temporal domain. RS effects induced by the migration of different types of ions, often driven by an electric field, are discussed. It is shown that, by taking advantage of the different state variables controlled by the ionic processes, important synaptic functions can be faithfully implemented in solid‐state devices and networks. Recent efforts on improving the controllability of ionic processes to optimize device performance are also discussed, along with new opportunities for material design and engineering enabled by the ability to control ionic processes at the atomic scale.
Highly Sensitive, Stretchable Strain Sensor Based on Ag@COOH‐Functionalized CNTs for Stroke and Pronunciation Recognition
Authors: Pei Zhen , Liu Yan , Zhang Qiang , Zhao Dong , Wang Jie , Yuan Zhongyun , Zhang Wendong , Sang Shengbo 
Published: May 2019

AbstractCombining metal and carbon nanomaterials is an effective way to significantly enhance the performance of soft strain sensors. The role of carbon nanotubes (CNTs) functionalized with different chemical groups in improving the properties of nanosilver‐coated carbon nanotubes (Ag@CNT) is investigated. The functionalized CNTs are first calculated with different chemical groups combined with the silver atoms. Ag@COOH‐functionalized CNTs exhibit greater binding energy and a smaller bandgap, which leads to better hydrophilicity, stability, and stronger bonding. Ag@CNTs are then synthesized using pristine CNT, OH‐functionalized CNT, and COOH‐functionalized CNT. Strain sensors are fabricated by wrapping the sensing material with polydimethylsiloxane (PDMS) to form a sandwich structure. Tests of these sensors are consistent with the simulation results; that is, COOH‐functionalized CNTs can greatly enhance the performance of Ag@CNT. In particular, Ag@COOH‐functionalized CNT sensors exhibit a strain range of nearly 40%, an initial resistance of 6.83 Ω, and excellent sensitivity, with a GF of 172. They can be applied in stroke detection and pronunciation recognition. This system also has great potential for foldable phones and flexible writing pads.
Protecting‐Group‐Controlled Enzymatic Glycosylation of Oligo‐N‐Acetyllactosamine Derivatives
Authors: Gagarinov Ivan A. , Li Tiehai , Wei Na , Sastre Toraño Javier , de Vries Robert P. , Wolfert Margreet A. , Boons Geert‐Jan 
Published: May 2019

AbstractWe describe a chemoenzymatic strategy that can give a library of differentially fucosylated and sialylated oligosaccharides starting from a single chemically synthesized tri‐N‐acetyllactosamine derivative. The common precursor could easily be converted into 6 different hexasaccharides in which the glucosamine moieties are either acetylated (GlcNAc) or modified as a free amine (GlcNH2) or Boc (GlcNHBoc). Fucosylation of the resulting compounds by a recombinant fucosyl transferase resulted in only modification of the natural GlcNAc moieties, providing access to 6 selectively mono‐ and bis‐fucosylated oligosaccharides. Conversion of the GlcNH2 or GlcNHBoc moieties into the natural GlcNAc, followed by sialylation by sialyl transferases gave 12 differently fucosylated and sialylated compounds. The oligosaccharides were printed as a microarray that was probed by several glycan‐binding proteins, demonstrating that complex patterns of fucosylation can modulate glycan recognition.
Ultrathin Metal–Organic Framework Nanosheets with Ultrahigh Loading of Single Pt Atoms for Efficient Visible‐Light‐Driven Photocatalytic H2 Evolution
Authors: Zuo Quan , Liu Tingting , Chen Chuanshuang , Ji Yi , Gong Xueqing , Mai Yiyong , Zhou Yongfeng 
Published: May 2019

AbstractA surfactant‐stabilized coordination strategy is used to make two‐dimensional (2D) single‐atom catalysts (SACs) with an ultrahigh Pt loading of 12.0 wt %, by assembly of pre‐formed single Pt atom coordinated porphyrin precursors into free‐standing metal–organic framework (MOF) nanosheets with an ultrathin thickness of 2.4±0.9 nm. This is the first example of 2D MOF‐based SACs. Remarkably, the 2D SACs exhibit a record‐high photocatalytic H2 evolution rate of 11 320 μmol g−1 h−1 via water splitting under visible light irradiation (λ>420 nm) compared with those of reported MOF‐based photocatalysts. Moreover, the MOF nanosheets can be readily drop‐casted onto solid substrates, forming thin films while still retaining their photocatalytic activity, which is highly desirable for practical solar H2 production.
Hydrogen by Deuterium Substitution in an Aldehyde Tunes the Regioselectivity by a Nonheme Manganese(III)–Peroxo Complex
Authors: Barman Prasenjit , Cantú Reinhard Fabián G. , Bagha Umesh Kumar , Kumar Devesh , Sastri Chivukula V. , de Visser Sam P. 
Published: May 2019

AbstractMononuclear nonheme MnIII‐peroxo complexes are important intermediates in biology, and take part in oxygen activation by photosystem II. Herein, we present work on two isomeric biomimetic side‐on MnIII‐peroxo intermediates with bispidine ligand system and reactivity patterns with aldehydes. The complexes are characterized with UV/Vis and mass spectrometric techniques and reaction rates with cyclohexane carboxaldehyde (CCA) are measured. The reaction gives an unusual regioselectivity switch from aliphatic to aldehyde hydrogen atom abstraction upon deuteration of the substrate, leading to the corresponding carboxylic acid product for the latter, while the former gives a deformylation reaction. Mechanistic details are established from kinetic isotope effect studies and density functional theory calculations. Thus, replacement of C−H by C−D raises the hydrogen atom abstraction barriers and enables a regioselectivity switch to a competitive pathway that is slightly higher in energy.
Wall‐ and Hybridisation‐Selective Synthesis of Nitrogen‐Doped Double‐Walled Carbon Nanotubes
Authors: Carini Marco , Shi Lei , Chamberlain Thomas W. , Liu Meng , Valenti Giovanni , Melle‐Franco Manuel , Paolucci Francesco , Khlobystov Andrei N. , Pichler Thomas , Mateo‐Alonso Aurelio 
Published: May 2019

AbstractControlled nitrogen‐doping is a powerful methodology to modify the properties of carbon nanostructures and produce functional materials for electrocatalysis, energy conversion and storage, and sensing, among others. Herein, we report a wall‐ and hybridisation‐selective synthetic methodology to produce double‐walled carbon nanotubes with an inner tube doped exclusively with graphitic sp2‐nitrogen atoms. Our measurements shed light on the fundamental properties of nitrogen‐doped nanocarbons opening the door for developing their potential applications.
Isostructural Three‐Dimensional Covalent Organic Frameworks
Authors: Gao Chao , Li Jian , Yin Sheng , Lin Guiqing , Ma Tianqiong , Meng Yi , Sun Junliang , Wang Cheng 
Published: May 2019

AbstractHerein, we reported the designed synthesis of three isostructural three‐dimensional covalent organic frameworks (3D COFs) with ‐H, ‐Me, or ‐F substituents, which have similar crystallinity and topology. Their crystal structures were determined by continuous rotation electron diffraction (cRED), and all three 3D COFs were found to adopt a fivefold interpenetrated pts topology. More importantly, the resolution of these cRED datasets reached up to 0.9–1.0 Å, enabling the localization of all non‐hydrogen atomic positions in a COF framework directly by 3D ED techniques for the first time. In addition, the precise control of the pore environments through the use of different functional groups led to different selectivities for CO2 over N2. We have thus confirmed that polycrystalline COFs can be definitely studied to the atomic level as other materials, and this study should also inspire the design and synthesis of 3D COFs with tailored pore environments for interesting applications.
Charge Polarization from Atomic Metals on Adjacent Graphitic Layers for Enhancing the Hydrogen Evolution Reaction
Authors: Zhang Longzhou , Jia Yi , Liu Hongli , Zhuang Linzhou , Yan Xuecheng , Lang Chengguang , Wang Xin , Yang Dongjiang , Huang Keke , Feng Shouhua , Yao Xiangdong 
Published: May 2019

AbstractAtomic metal species‐based catalysts (AMCs) show remarkable possibilities in various catalytic reactions. The coordination configuration of the metal atoms has been widely recognized as the determining factor to the electronic structure and the catalytic activity. However, the synergistic effect between the adjacent layers of the multilayered AMCs is always neglected. We reported an atomic Co and Pt co‐trapped carbon catalyst, which exhibits a ultrahigh activity for HER in the wide range of pH (η10=27 and 50 mV in acidic and alkaline media, respectively) with ultralow metal loadings (1.72 and 0.16 wt % for Co and Pt, respectively), which is much superior to the commercial Pt/C. Theoretical analysis reveals that the atomic metals on the inner graphitic layers significantly alter the electronic structure of the outmost layer, thus tailoring the HER activity. This finding arouses a re‐thinking of the intrinsic activity origins of AMCs and suggests a new avenue in the structure design of AMCs.
Reversible Switching of Catalytic Activity by Shuttling an Atom into and out of Gold Nanoclusters
Authors: Cai Xiao , Saranya Govindarajan , Shen Kangqi , Chen Mingyang , Si Rui , Ding Weiping , Zhu Yan 
Published: May 2019

AbstractIt is challenging to control the catalyst activation and deactivation by removal and addition of only one central atom, as it is almost impossible to precisely abstract an atom from a conventional catalyst and analyze its catalysis. Here we report that the loss of one central atom in Au25 (resulting in Au24) enhances the catalytic activity in the oxidation of methane compared to the original Au25. More importantly, the activity can be readily switched through shuttling the central atom into Au24 and out of Au25. This work will serve as a starting point for design rules on how to control catalytic performance of a catalyst by an atom alteration.
Highly efficient ring‐opening polymerization of tetrahydrofuran by anhydrous ferric chloride
Authors: Yang Hee Jung , Yoon Seok Won , Park Hee Sun , Lee Kyu Hyung , Hur Nam Hwi 
Published: May 2019

ABSTRACTPoly(tetramethylene ether glycol) (PTMG), widely used as a precursor in the fabrication of commodity polymers, is typically produced byacid‐catalyzed polymerization of tetrahydrofuran (THF). Herein, we report a detailed investigation of the cationic ring‐opening polymerization of THF catalyzed by ferric chloride (FeCl3), which can be considered as a strong Lewisacid. The polymerization reactions were performed in the presence of acetic anhydride at 20°C with FeCl3, which readily produced poly(tetramethylene ether glycol diester) (PTMG_DE). A maximum yield of 79.2% was obtained within 30 min using a FeCl3 to acetic anhydride molar ratio of 5:4. The resulting polymers generally exhibited low molecular weights and a narrow polydispersity index and could be easily converted into PTMG using aqueous NaOH. In contrast with the FeCl3‐acetic anhydride system, other iron‐based catalysts such as FeCl2 and FeCl3·6H2O did not show any noticeable activity in the polymerization of THF. The proposed mechanism involves initiation of the acetyl cation generated by FeCl3, propagation by nucleophilic addition of THF, and termination by the acetate anion, accounting for the high activity of the FeCl3 catalyst for THF polymerization. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47999.
N‐[2‐[(3‐Chlorophenyl)amino]‐phenyl]‐3‐(difluoromethyl)‐1‐methyl‐1H‐pyrazole‐4‐carboxamide: Synthesis, Crystal Structure, Molecular Docking and Biological Activities
Authors: Zhang Aigui , Yang Yihua , Yue Ying , Tao Ke , Hou Taiping , Jin Hong 
Published: May 2019

AbstractIn continuation of our previous research on the development of novel pyrazole‐4‐carboxamide with potential antifungal activity, compound SCU2028, namely N‐[2‐[(3‐chlorophenyl)amino]phenyl]‐3‐(difluoromethyl)‐1‐methyl‐1H‐pyrazole‐4‐carboxamide, was synthesized by new method, structurally characterized by IR, HR‐ESI‐MS, 1H‐ and 13C‐NMR spectra and further identified by single‐crystal X‐ray diffraction. In pot tests, compound SCU2028 showed good in vivo antifungal activity against Rhizoctonia solani (R. solani) and IC50 value of it was 7.48 mg L−1. In field trials, control efficacy of compound SCU2028 at 200 g.a.i. ha−1 was 42.30 % on the 7th day after the first spraying and 68.10 % on the 14th day after the second spraying, only slightly lower than that of thifluzamide (57.20 % and 71.40 %, respectively). Further in vitro inhibitory activity showed inhibitory ability of compound SCU2028 was 45‐fold higher than that of bixafen and molecular docking of compound SCU2028 to SDH predicted its binding orientation in the active site of the target protein SDH. These results suggested that compound SCU2028 was a potential fungicide for control of rice sheath blight.
Pulmonary lobectomy in two multitrauma patients under extracorporeal circulation placed preoperatively in an intensive care unit: A case report
Authors: Faidherbe Clément , De Kock Marc , Simonet Olivier , Vallot Frédéric , Ndjekembo Shango Didier 
Published: May 2019

AbstractThe clinical course of our two patients highlights the feasibility of using venovenous extracorporeal membrane oxygenation (ECMO) with heparin for multitraumatic patients needing thoracic surgery. Further research is required to determine if surgery can be performed with totally heparin‐free vv‐ECMO. All ICU teams should become familiar with this technique.