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Bridge enhanced

Jemal Yimer Damte, Shang-Lin Lyu, Ermias Girma Leggesse, Jyh Chiang Jiang
The decomposition of methanol is currently attracting research attention due to the potential widespread applications of its end products. In this work, density functional theory (DFT) calculations have been performed to investigate the adsorption and decomposition of methanol on a Ru-Pt/boron doped graphene surface. We find that the most favorable reaction pathway is methanol (CH3OH) decomposition through O-H bond breaking to form methoxide (CH3O) as the initial step, followed by further dehydrogenation steps which generate formaldehyde (CH2O), formyl (CHO), and carbon monoxide (CO)...
March 22, 2018: Physical Chemistry Chemical Physics: PCCP
Wei Ji, Xue Zhang, Jianzhang Zhao, Ye Gao, Wei Song, Yukihiro Ozaki
A simple and ultrasensitive surface-enhanced Raman scattering (SERS) assay for heparin detection has been demonstrated based on an in situ hot spot assembly method using N,N'-bis[3,3'-(trimethylammonium)propylamine]-3,4,9,10-perylenediimide (bis-quaternized perylene dye, abbreviated as BQPER). In this assay, a BQPER probe with two positive charges is employed as both Raman reporter and electrostatic bridge to cause the aggregation of citrate-capped Ag nanoparticles (Ag NPs), resulting in a strong SERS signal due to the formation of numerous hot spots in the gaps of the aggregates...
March 21, 2018: Analyst
Chung-Hsuan Huang, Satish Kumar
Transfer of liquid from one surface to another plays a vital role in printing processes. During liquid transfer, a liquid bridge is formed and subjected to substantial extension, but incomplete liquid transfer can produce defects that are detrimental to the operation of printed electronic devices. One strategy for minimizing these defects is to apply an electric field, a technique known as electrostatic assist (ESA). However, the physical mechanisms underlying ESA remain a mystery. To better understand these mechanisms, slender-jet models are developed for both perfect dielectric and leaky dielectric axisymmetric Newtonian liquid bridges with moving contact lines...
March 21, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Boworn Soonthornsumrith, Jirawat Saetan, Thanapong Kruangkum, Tipsuda Thongbuakaew, Thanyaporn Senarai, Ronnarong Palasoon, Prasert Sobhon, Prapee Sretarugsa
The giant freshwater prawn, Macrobrachium rosenbergii, is an economically important crustacean species which has also been extensively used as a model in neuroscience research. The crustacean central nervous system is a highly complex structure, especially the brain. However, little information is available on the brain structure, especially the three-dimensional organization. In this study, we demonstrated the three-dimensional structure and histology of the brain of M. rosenbergii together with the distribution of serotonin (5-HT) in the brain and ovary as well as its effects on ovarian steroidogenesis...
March 20, 2018: Invertebrate Neuroscience: IN
Mans Broekgaarden, Imran Rizvi, Anne-Laure Bulin, Ljubica Petrovic, Ruth Goldschmidt, Iqbal Massodi, Jonathan P Celli, Tayyaba Hasan
Effective treatment of advanced metastatic disease remains the primary challenge in the management of inoperable pancreatic cancer. Current therapies such as oxaliplatin (OxPt)-based chemotherapy regimens (FOLFIRINOX) provide modest short-term survival improvements, yet with significant toxicity. Photodynamic therapy (PDT), a light-activated cancer therapy, demonstrated clinical promise for pancreatic cancer treatment and enhances conventional chemotherapies with non-overlapping toxicities. This study investigates the capacity of neoadjuvant PDT using a clinically-approved photosensitizer, benzoporphyrin derivative (BPD, verteporfin), to enhance OxPt efficacy in metastatic pancreatic cancer...
February 27, 2018: Oncotarget
Hiroaki Senju, Asuka Kumagai, Yoichi Nakamura, Hiroyuki Yamaguchi, Katsumi Nakatomi, Shota Fukami, Kengo Shiraishi, Yuka Harada, Mitsuhiro Nakamura, Haruki Okamura, Yoshimasa Tanaka, Hiroshi Mukae
When pathogenic stresses are recognized by innate immune cells, inflammasomes are assembled and caspase-1 is activated, resulting in the conversion of pro-IL-18 into mature IL-18. Because natural killer (NK) cells express IL-18 receptors, IL-18 may play roles in immune functions of NK cells. In the present study, we examined the effect of IL-18 on NK cells derived from lung cancer patients and healthy adult volunteers. When peripheral blood NK cells were stimulated with IL-2, the cells formed clusters beginning on day 5-6 and proliferated thereafter, in which the number of NK cells increased by 10-fold in 10 days...
2018: International Journal of Biological Sciences
Chunxue Hao, Bochong Wang, Fusheng Wen, Congpu Mu, Jianyong Xiang, Lei Li, Zhongyuan Liu
Through a facile self-assembled process, an ultralight reduced graphene oxide/black phosphorus (rGO/BP) composite aerogel was successfully fabricated. The BP nanosheets were homogeneously distributed throughout the rGO 3D framework, and the interfaces between rGO and BP possessed four kinds of interconnections, such as wrapping, wearing, bridging and weak linking. As an ultralight composite, the rGO/BP aerogel could easily stand on the stamen of a flower. Compared with pure rGO aerogel, the rGO/BP composite aerogel exhibited enhanced microwave absorption ability...
March 20, 2018: Nanotechnology
Arup Kumar Pathak, Tusar Bandyopadhyay
A well-tempered metadynamics simulation is performed to study the unbinding process of a fluorinated oxime (FHI-6) drug from the active site gorge of acetylcholinesterase enzyme in a polarizable water medium. Cation-π interactions, water bridge, and hydrogen bridge formations between the protein and the drug molecule are found to strongly influence the unbinding process, forming basins and barriers along the gorge pathway. Distinct unbinding pathways are found when compared with its recently reported nonfluorinated analogue, HI-6...
March 19, 2018: Journal of Physical Chemistry. B
Laura M Wagner, Mary A Dolansky, Robert Englander
BACKGROUND: Further efforts are warranted to identify innovative approaches to best implement competencies in nursing education. To bridge the gap between competency-based education, practice, and implementation of knowledge, skills, and attitudes, one emerging approach is entrustable professional activities (EPAs). PURPOSE: The objective of this study was to introduce the concept of EPAs as a framework for curriculum and assessment in graduate nursing education and training...
November 22, 2017: Nursing Outlook
Shinichi Miura
In this paper, the ground state of para-hydrogen clusters for size regime N ≤ 40 has been studied by our variational path integral molecular dynamics method. Long molecular dynamics calculations have been performed to accurately evaluate ground state properties. The chemical potential of the hydrogen molecule is found to have a zigzag size dependence, indicating the magic number stability for the clusters of the size N = 13, 26, 29, 34, and 39. One-body density of the hydrogen molecule is demonstrated to have a structured profile, not a melted one...
March 14, 2018: Journal of Chemical Physics
Yan-Mei Lei, Bai-Qi Xiao, Wen-Bin Liang, Ya-Qin Chai, Ruo Yuan, Ying Zhuo
It is well known that the conventional electrochemiluminescence (ECL) biosensor rely on the heterogeneous assay formats that involves the immobilization of biorecognition probe on the electrode surface before signal collection, which inevitably cause the efficiency of bio-recognition reactions to be limited owing to the existence of local steric hindrance. Herein, a robust, magnetic, and self-accelerated ECL nanosensor based on the multifunctionalized cobalt ferrite magnetite nanoparticles (CoFe2 O4 MNPs) was firstly designed for copper ion (Cu2+ ) detection in quasi-homogeneous system...
March 7, 2018: Biosensors & Bioelectronics
Lai Lyu, Dengbiao Yan, Guangfei Yu, Wenrui Cao, Chun Hu
Carbon nitride compounds (CN) complexed with the in-situ produced Cu(II) on the surface of CuAlO2 substrate (CN-Cu(II)-CuAlO2) is prepared via a surface growth process for the first time, which exhibits exceptionally high activity and efficiency for the degradation of the refractory pollutants in water through a Fenton-like process in a wide pH range. The reaction rate for BPA removal is ~25 times higher than that of the CuAlO2. According to the characterization, Cu(II) generation on the surface of CuAlO2 during the surface growth process result in the marked decrease of the surface oxygen vacancies and the formation of the C-O-Cu bridges between CN and Cu(II)-CuAlO2 in the catalyst...
March 15, 2018: Environmental Science & Technology
Dongshuai Hou, Tiejun Yang, Jinhui Tang, Shaochun Li
Graphene oxide (GO) reinforced cement nanocomposites open up a new path for sustainable concrete design. In this paper, reactive force-field molecular dynamics was utilized to investigate the structure, reactivity and interfacial bonding of calcium silicate hydrate (C-S-H)/GO nanocomposite functionalized by hydroxyl (C-OH), epoxy (C-O-C), carboxyl (COOH) and sulfonic (SO3 H) groups with a coverage of 10%. The silicate chains in the hydrophilic C-S-H substrate provided numerous non-bridging oxygen sites and counter ions (Ca ions) with high reactivity, which allowed interlayer water molecules to dissociate into Si-OH and Ca-OH...
March 15, 2018: Physical Chemistry Chemical Physics: PCCP
Lindsay L Warner, Paul A Warner, Jason S Eldrige
No abstract text is available yet for this article.
March 9, 2018: International Journal of Medical Education
Jingjing Yang, Dian Gong, Guihua Li, Gaofeng Zeng, Qiyan Wang, Yelei Zhang, Guojuan Liu, Ping Wu, Evgeny Vovk, Zheng Peng, Xiaohong Zhou, Yong Yang, Zhi Liu, Yuhan Sun
The poor mechanical strength of graphene oxide (GO) membranes, caused by the weak interlamellar interactions, poses a critical challenge for any practical application. In addition, intrinsic but large-sized 2D channels of stacked GO membranes lead to low selectivity for small molecules. To address the mechanical strength and 2D channel size control, thiourea covalent-linked graphene oxide framework (TU-GOF) membranes on porous ceramics are developed through a facile hydrothermal self-assembly synthesis. With this strategy, thiourea-bridged GO laminates periodically through the dehydration condensation reactions via NH2 and/or SH with OCOH as well as the nucleophilic addition reactions of NH2 to COC, leading to narrowed and structurally well-defined 2D channels due to the small dimension of the covalent TU-link and the deoxygenated processes...
March 14, 2018: Advanced Materials
Diego Hojsgaard
Polyploid genomes evolve and follow a series of dynamic transfigurations along with adaptation and speciation. The initial formation of a new polyploid individual within a diploid population usually involves a triploid bridge, a two-step mechanism of cell fusions between ubiquitous (reduced) and rare (unreduced) gametes. The primary fusion event creates an intermediate triploid individual with unbalanced genome sets, a situation of genomic-shock characterized by gene expression dysregulation, high dosage sensitivity, disturbed cell divisions, and physiological and reproductive attributes drastically altered...
2018: Frontiers in Plant Science
Patrick T Reeves, Matthew A Borgman, Nicole W Caldwell, Leela Patel, James Aden, John P Duggan, Maria L Serio-Melvin, Elizabeth A Mann-Salinas
OBJECTIVE: The Advanced Burn Life Support (ABLS) program is a burn-education curriculum nearly 30 years in the making, focusing on the unique challenges of the first 24h of care after burn injury. Our team applied high fidelity human patient simulation (HFHPS) to the established ABLS curriculum. Our hypothesis was that HFHPS would be a feasible, easily replicable, and valuable adjunct to the current curriculum that would enhance learner experience. METHODS: This prospective, evidenced-based practice project was conducted in a single simulation center employing the American Burn Association's ABLS curriculum using HFHPS...
March 10, 2018: Burns: Journal of the International Society for Burn Injuries
Li-Xuan Cai, Shao-Chuan Li, Dan-Ni Yan, Li-Peng Zhou, Fang Guo, Qing-Fu Sun
Transformations within container-molecules provide a good alternative between traditional homogeneous and heter-ogeneous catalysis, as the containers themselves can be regarded as single molecular nanomicelles. We report here the designed-synthesis of a water-soluble redox-active supramolecular Pd4L2 cage and its application in the encapsulation of aromatic molecules and polyoxometalates (POMs) catalysts. Compared to the previous known Pd6L4 cage, our results show that replacement of two cis-blocked palladium corners with p-xylene bridges through pyridinium bonds formation between the 2,4,6-tri-4-pyridyl-1,3,5-triazine (TPT) ligands not only provides reversible redox-activities for the new Pd4L2 cage, but also realizes the expansion and subdivision of its internal cavity...
March 13, 2018: Journal of the American Chemical Society
Yibo Liu, Feng Wang, Juewen Liu
Phospholipids are a major component of the cell membrane. In most natural phospholipids, the phosphate acts as a bridge, connecting the other portion of the polar headgroup with the hydrophobic tails. Such bridging phosphate is chemically quite inert. Synthetic lipids inversing the headgroup polarity of phosphocholine (PC) have been recently reported, and these are named CP lipids with a terminal phosphate, or CPe with the terminal phosphate capped by an ethyl group. This Feature Article summarizes the properties and applications of such inversed lipids...
March 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yo Han Kwon, Krysten Minnici, Jung Jin Park, Sujin R Lee, Guoyan Zhang, Esther S Takeuchi, Kenneth J Takeuchi, Amy C Marschilok, Elsa Reichmanis
Conjugated polymers possessing polar functionalities were shown to effectively anchor single-walled carbon nanotubes (SWNTs) to the surface of high-capacity anode materials, and enable the formation of electrical networks. Specifically, poly[3-(potassium-4-butanoate) thiophene] (PPBT) served as a bridge between SWNT networks and various anode materials, including monodispersed Fe3O4 spheres (sFe3O4), and silicon nanoparticles (Si NPs). The PPBT π‒conjugated backbone and carboxylate (COO‒) substituted alkyl side chains, respectively, attracted the SWNT π‒electron surface and chemically interacted with active material surface hydroxyl (‒OH) species to form a carboxylate bond...
March 10, 2018: Journal of the American Chemical Society
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