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https://www.readbyqxmd.com/read/28351127/absorption-amelioration-of-amorphous-si-film-by-introducing-metal-silicide-nanoparticles
#1
Hui Sun, Hsuan-Chung Wu, Sheng-Chi Chen, Che-Wei Ma Lee, Xin Wang
Amorphous Si (a-Si) films with metal silicide are expected to enhance the absorption ability of pure a-Si films. In this present study, NiSi (20 nm)/Si (40 nm) and AlSi (20 nm)/Si (40 nm) bilayer thin films are deposited through radio frequency (RF) sputtering at room temperature. The influence of the film's composition and the annealing temperature on the film's optical absorption is investigated. The results show that all the NiSi/Si films and AlSi/Si films possess higher absorption ability compared to a pure a-Si film (60 nm)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28351079/editorial-to-methamphetamine-crystal-meth-and-new-psychoactive-substances
#2
Ulrich S Zimmermann
No abstract text is available yet for this article.
March 28, 2017: Pharmacopsychiatry
https://www.readbyqxmd.com/read/28350710/physical-chemistry-of-bile-detailed-pathogenesis-of-cholelithiasis
#3
Malak Itani, Theodore J Dubinsky
Despite the overwhelming prevalence of cholelithiasis, many health care professionals are not familiar with the basic pathophysiology of gallstone formation. This article provides an overview of the biochemical pathways related to bile, with a focus on the physical chemistry of bile. We describe the important factors in bile synthesis and secretion that affect the composition of bile and consequently its liquid state. Within this biochemical background lies the foundation for understanding the clinical and sonographic manifestation of cholelithiasis, including the pathophysiology of cholesterol crystallization, gallbladder sludge, and gallstones...
March 27, 2017: Ultrasound Quarterly
https://www.readbyqxmd.com/read/28350474/detachment-of-membrane-bound-virions-by-competitive-ligand-binding-induced-receptor-depletion
#4
Nagma Parveen, Stephan Block, Vladimir P Zhdanov, Gustaf E Rydell, Fredrik Höök
Multivalent receptor-mediated interactions between virions and a lipid membrane can be weakened using competitive non-pathogenic ligand binding. In particular, the subsequent binding of such ligands can induce detachment of bound virions, a phenomena of crucial relevance for the development of new antiviral drugs. Focusing on the simian virus 40 (SV40) and recombinant cholera toxin B subunit (rCTB), and using (monosialotetrahexosyl)ganglioside (GM1) as their common receptor in a supported lipid bilayer (SLB), we present the first detailed investigation of this phenomenon by employing the quartz crystal microbalance with dissipation (QCM-D) and total internal reflection fluorescence (TIRF) microscopy assisted 2D single particle tracking (SPT) techniques...
March 28, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28350434/stepwise-synthesis-of-metal-organic-frameworks
#5
Mathieu Bosch, Shuai Yuan, William Rutledge, Hong-Cai Zhou
Metal-organic frameworks (MOFs) are a category of porous materials that offer unparalleled control over their surface areas (demonstrated as higher than for any other material), pore characteristics, and functionalization. This allows them to be customized for exceptional performance in a wide variety of applications, most commonly including gas storage and separation, drug delivery, luminescence, or heterogeneous catalysis. In order to optimize biomimicry, controlled separations and storage of small molecules, and detailed testing of structure-property relationships, one major goal of MOF research is "rational design" or "pore engineering", or precise control of the placement of multiple functional groups in pores of chosen sizes and shapes...
March 28, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28346937/in-crystal-reaction-cycle-of-a-toluene-bound-diiron-hydroxylase
#6
Justin F Acheson, Lucas J Bailey, Thomas C Brunold, Brian G Fox
Electrophilic aromatic substitution is one of the most important and recognizable classes of organic chemical transformation. Enzymes create the strong electrophiles that are needed for these highly energetic reactions by using O2, electrons, and metals or other cofactors. Although the nature of the oxidants that carry out electrophilic aromatic substitution has been deduced from many approaches, it has been difficult to determine their structures. Here we show the structure of a diiron hydroxylase intermediate formed during a reaction with toluene...
March 27, 2017: Nature
https://www.readbyqxmd.com/read/28346861/biomimetic-remineralization-of-carious-lesions-by-self-assembling-peptide
#7
L Kind, S Stevanovic, S Wuttig, S Wimberger, J Hofer, B Müller, U Pieles
Caries is the most common disease in the world. Great efforts have been undertaken for prevention and to identify a regenerative treatment solution for dental caries. Self-assembling β-sheet forming peptides have previously shown to form 3-dimensional fiber networks supporting tissue regeneration. In particular, the self-assembling peptide P11-4 has shown potential in the treatment and prevention of dental caries. It has previously been shown that application of monomeric P11-4 solution to early carious lesions can increase net mineral gain by forming de novo hydroxyapatite crystals...
March 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28346784/structure-determination-of-mycobacterium-tuberculosis-serine-protease-hip1-rv2224c
#8
Jacqueline Lara Naffin-Olivos, Andrew Daab, Andre White, Nathan Eric Goldfarb, Amy C Milne, Dali Liu, Jacqueline Baikovitz, Ben M Dunn, Jyothi Rengarajan, Gregory A Petsko, Dagmar Ringe
The Mycobacterium tuberculosis (Mtb) serine protease Hip1 (Hydrolase important for pathogenesis; Rv2224c) promotes tuberculosis (TB) pathogenesis by impairing host immune responses through proteolysis of a protein substrate, Mtb GroEL2. The cell surface localization of Hip1 and its immunomodulatory functions make Hip1 a good drug target for new adjunctive immune therapies for TB. Here we report the crystal structure of Hip1 to a resolution of 2.6 Å and the kinetic studies of the enzyme against model substrates and the protein GroEL2...
March 27, 2017: Biochemistry
https://www.readbyqxmd.com/read/28346782/%C3%AE%C2%BA-carrageenan-enhances-the-biomineralization-and-osteogenic-differentiation-of-electrospun-phb-and-phbv-fibers
#9
Nowsheen Goonoo, Behnam Khanbabaee, Marc Steuber, Archana Bhaw-Luximon, Ulrich Jonas, Ullrich Pietsch, Dhanjay Jhurry, Holger Schönherr
Novel electrospun materials for bone tissue engineering were obtained by blending biodegradable polyhydroxybutyrate (PHB) or polyhydroxybutyrate valerate (PHBV) with the anionic sulfated polysaccharide κ-carrageenan (κ-CG) in varying ratios. In both systems, the two components phase separated as shown by FTIR, DSC and TGA. According to the contact angle data, κ-CG was localized preferentially at the fiber surface in PHBV/ κ-CG blends in contrast to PHB/ κ-CG, where the biopolymer was mostly found within the fiber...
March 27, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28346407/insights-into-activity-and-inhibition-from-the-crystal-structure-of-human-o-glcnacase
#10
Nathaniel L Elsen, Sangita B Patel, Rachael E Ford, Dawn L Hall, Fred Hess, Hari Kandula, Maria Kornienko, John Reid, Harold Selnick, Jennifer M Shipman, Sujata Sharma, Kevin J Lumb, Stephen M Soisson, Daniel J Klein
O-GlcNAc hydrolase (OGA) catalyzes removal of βα-linked N-acetyl-D-glucosamine from serine and threonine residues. We report crystal structures of Homo sapiens OGA catalytic domain in apo and inhibited states, revealing a flexible dimer that displays three unique conformations and is characterized by subdomain α-helix swapping. These results identify new structural features of the substrate-binding groove adjacent to the catalytic site and open new opportunities for structural, mechanistic and drug discovery activities...
March 27, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28346359/new-acorane-type-sesquiterpene-from-acorus-calamus-l
#11
Juan Li, Jianping Zhao, Wei Wang, Lin Li, Lan Zhang, Xiao-Fang Zhao, Qing-Ru Liu, Fang Liu, Min Yang, Ikhlas A Khan, Shun-Xiang Li
A new sesquiterpene, named neo-acorane A (1), and two known ones, acoric acid (2) and calamusin D (3), were isolated from a 95% ethanol extract of the rhizome parts of Acorus calamus L. Their structures were elucidated by spectroscopic methods, and the absolute configurations were determined by single-crystal X-ray diffraction analysis. Compounds 1 and 2 are nonisoprenoid sesquiterpenoids, likely biosynthesized from an acorane-type sesquiterpene by oxidative fission of the six- or five-membered ring. Moreover, compounds 1 (10 μM), 2 (5 μM and 10 μM) and 3 (10 μM) showed cell proliferation activity on the SK-N-BE (2) cell line...
March 26, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28346220/magnetocrystalline-two-fold-symmetry-in-cafe2o4-single-crystal
#12
Ashish Chhaganlal Gandhi, Rajasree Das, Fang-Cheng Chou, Jauyn Grace Lin
Understanding of magnetocrystalline anisotropy in CaFe2O4 is a matter of importance for its future applications. A high quality single crystal CaFe2O4 sample is studied by using synchrotron x-ray diffraction, a magnetometer and the electron spin resonance (ESR) technique. A broad feature of the susceptibility curve around room temperature is observed, indicating the development of 1D spin interactions above the on-set of antiferromagnetic transition. The angular dependency of ESR reveals an in-plane two-fold symmetry, suggesting a strong correlation between the room temperature spin structure and magnetocrystalline anisotropy...
March 27, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28346216/non-linear-conduction-due-to-depinning-of-charge-order-domains-in-fe-sub-3-sub-o-sub-2-sub-bo-sub-3-sub
#13
Éverton Carvalho Dos Santos, Everlin da Silva, João Fernandes, Luis Ghivelder, Daniele Freitas, Mucio A Continentino, Lygia Walmsley
The oxyborate Fe<sub>3</sub>O<sub>2</sub>BO<sub>3</sub> presents a charge density wave (CDW) transition close to room tem- perature. As we show here, this is associated with a well defined anomaly in the specific heat. Below this transition, when applying in a single crystal of Fe<sub>3</sub>O<sub>2</sub>BO<sub>3</sub> a DC voltage above a temperature dependent threshold, a high current is liberated in this material. We study the conduction in single crystals of Fe<sub>3</sub>O<sub>2</sub>BO<sub>3</sub> with voltage applied parallel and perpendicular to the crystallographic c-axis direction...
March 27, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28346200/compatibility-and-stability-of-rolapitrant-injectable-emulsion-admixed-with-intravenous-palonsetron-hydrochloride
#14
George Wu, Stanley Yeung, Frank Chen
Neurokinin-1 receptor antagonist, 5-hydroxytryptamine-3 RA, and dexamethasone combination therapy is standard of care for the prevention of chemotherapy-induced nausea and vomiting. Herein we describe the physical and chemical stability of rolapitant injectable emulsion 166.5 mg in 92.5 mL (185 mg hydrochloride salt) admixed with palonosetron injection 0.25 mg in 5 mL (0.28 mg hydrochloride salt). Admixtures were prepared and stored in two types of container closures (110-mL Crystal Zenith plastic and glass bottles) and four types of intravenous administration sets (or intravenous tubing sets)...
January 2017: International Journal of Pharmaceutical Compounding
https://www.readbyqxmd.com/read/28346199/compatibility-and-stability-of-rolapitant-injectable-emulsion-admixed-with-dexamethasone-sodium-phosphate
#15
George Wu, Stanley Yeung, Frank Chen
Neurokinin-1 receptor antagonist, 5-hydroxytryptamine-3 receptor antagonist, and dexamethasone combination therapy is the standard of care for the prevention of chemotherapy-induced nausea and vomiting. Herein, we describe the physical and chemical stability of an injectable emulsion of the Neurokinin-1 receptor antagonist rolapitant 185 mg in 92.5 mL (free base, 166.5 mg in 92.5 mL) admixed with either 2.5 mL of dexamethasone sodium phosphate (10 mg) or 5 mL of dexamethasone sodium phosphate (20 mg). Admixtures were prepared and stored in two types of container closures (glass and Crystal Zenith plastic bottles) and four types of intravenous administration tubing sets (or intravenous tubing sets)...
January 2017: International Journal of Pharmaceutical Compounding
https://www.readbyqxmd.com/read/28345955/smoking-dependent-distal-to-proximal-repatterning-of-the-adult-human-small-airway-epithelium
#16
Jing Yang, Wu-Lin Zuo, Tomoya Fukui, IonWa Chao, Kazunori Gomi, Busub Lee, Michelle R Staudt, Robert J Kaner, Yael Strulovici-Barel, Jacqueline Salit, Ronald G Crystal, Renat Shaykhiev
RATIONALE: Small airways are the primary site of pathologic changes in chronic obstructive pulmonary disease (COPD), the major smoking-induced lung disorder. OBJECTIVES: Based on the concept of proximal-distal patterning that determines regional specialization of the airway epithelium during lung development, we hypothesized that a similar program operates in the adult human lung being altered by smoking leading to decreased regional identity of the small airway epithelium (SAE)...
March 27, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28345916/molecular-mechanism-of-nucleotide-dependent-allosteric-regulation-in-amp-activated-protein-kinase
#17
Navjeet Ahalawat, Rajesh Kumar Murarka
The AMP-activated protein kinase (AMPK), a central enzyme in the regulation of energy homeostasis, is an important drug target for type 2 diabetes, obesity and cancer. Binding of adenosine nucleotides to the regulatory γ-subunit tightly regulates the activity of this enzyme. Though recent crystal structures of AMPK have provided important insights into the allosteric activation of AMPK, molecular details of the regulatory mechanism of AMPK activation is still elusive. Here, we have performed extensive all-atom molecular dynamics (MD) simulations and shown that the kinase domain (KD) and γ-subunit comes closer resulting in a more compact heterotrimeric AMPK complex in AMP-bound state compared to the ATP-bound state...
March 27, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28345908/rapid-low-temperature-formation-of-imine-linked-cofs-catalyzed-by-metal-triflates
#18
Michio Matsumoto, Raghunath R Dasari, Woojung Ji, Cameron H Feriante, Timothy C Parker, Seth R Marder, William R Dichtel
Imine-linked two-dimensional covalent organic frameworks (2D COFs) are crystalline polymer networks with enhanced stability and broader monomer scope compared to boronate ester-linked systems. They are traditionally prepared by condensing polyfunctional aldehydes and amines at elevated temperature in a mixture of organic solvents and aqueous CH3CO2H, which catalyzes imine formation and exchange. Under these conditions, an amorphous imine-linked polymer network precipitates quickly and then crystallizes after extended reaction times (hours to days)...
March 27, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28345894/rich-coordination-chemistry-of-%C3%AF-acceptor-dibenzoarsole-ligands
#19
Arvind Kumar Gupta, Sunisa Akkarasamiyo, Andreas Orthaber
A series of dibenzoarsole (also known as 9-arsafluorene) derivatives have been prepared, and their coordination chemistry has been investigated. The different ligand topology and the arsenic substituents govern the reactivity of the ligands. We report various crystal structures of palladium and platinum complexes derived from this family of ligands. The biphenyl backbone of the bridged bidentate ligands allows very flexible coordination. We have also studied the application of an allylic Pd complex in nucleophilic substitution reactions, revealing that the benzoarsole substituent is susceptible to metal insertion...
March 27, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28345886/synthesis-and-crystal-structures-of-the-first-antimony-iii-aziridinides
#20
Nicole Harmgarth, Phil Liebing, Florian Zörner, Mindaugas Silinskas, Edmund P Burte, Frank T Edelmann
The first antimony(III) aziridinyl derivatives are reported. Treatment of anhydrous SbCl3 with N-lithioaziridine Li(Azn) (Azn = NC2H4) afforded the structurally unique heterobimetallic lithium/antimony(III) amide complex [Li3Sb(μ3-Cl)2(μ-Azn)4(THF)2]∞ (1). Homoleptic Sb2(Azn)6 (2) has become available for the first time through an amide group exchange reaction between Sb(NMe2)3 and 3 equiv of aziridine. The low-melting Sb2(Azn)6 exhibits a "weak dimer" structure in the crystal.
March 27, 2017: Inorganic Chemistry
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