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https://www.readbyqxmd.com/read/28538240/sharing-progress-in-neonatal-spin-brain-gut-heart-and-lung-incorporating-the-32nd-international-workshop-on-surfactant-replacement-dublin-may-26-27-2017-abstracts
#1
https://www.readbyqxmd.com/read/28538232/sharing-progress-in-neonatal-spin-brain-gut-heart-and-lung
#2
Eleanor J Molloy, Tore Curstedt, Henry L Halliday, Mikko Hallman, Ola D Saugstad, Christian P Speer
No abstract text is available yet for this article.
2017: Neonatology
https://www.readbyqxmd.com/read/28538152/apoptotic-bax-at-oxidatively-stressed-mitochondrial-membranes-lipid-dynamics-and-permeabilization
#3
Artur Peter Günther Dingeldein, Šárka Pokorná, Martin Lidman, Tobias Sparrman, Radek Šachl, Martin Hof, Gerhard Gröbner
Mitochondria are crucial compartments of eukaryotic cells because they function as the cellular power plant and play a central role in the early stages of programmed cell death (apoptosis). To avoid undesired cell death, this apoptotic pathway is tightly regulated by members of the Bcl-2 protein family, which interact on the external surface of the mitochondria, i.e., the mitochondrial outer membrane (MOM), and modulate its permeability to apoptotic factors, controlling their release into the cytosol. A growing body of evidence suggests that the MOM lipids play active roles in this permeabilization process...
May 23, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28538145/nmr-analysis-of-amide-hydrogen-exchange-rates-in-a-pentapeptide-repeat-protein-from-a-%C3%A2-thaliana
#4
Shenyuan Xu, Shuisong Ni, Michael A Kennedy
At2g44920 from Arabidopsis thaliana is a pentapeptide-repeat protein (PRP) composed of 25 repeats capped by N- and C-terminal α-helices. PRP structures are dominated by four-sided right-handed β-helices typically consisting of mixtures of type II and type IV β-turns. PRPs adopt repeated five-residue (Rfr) folds with an Rfr consensus sequence (STAV)(D/N)(L/F)(S/T/R)(X). Unlike other PRPs, At2g44920 consists exclusively of type II β-turns. At2g44920 is predicted to be located in the thylakoid lumen although its biochemical function remains unknown...
May 23, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28538088/effects-of-the-insulin-sensitizer-metformin-in-alzheimer-disease-pilot-data-from-a-randomized-placebo-controlled-crossover-study
#5
Aaron M Koenig, Dawn Mechanic-Hamilton, Sharon X Xie, Martha F Combs, Anne R Cappola, Long Xie, John A Detre, David A Wolk, Steven E Arnold
Epidemiological studies have identified a robust association between type II diabetes mellitus and Alzheimer disease (AD), and neurobiological studies have suggested the presence of central nervous system insulin resistance in individuals with AD. Given this association, we hypothesized that the central nervous system-penetrant insulin-sensitizing medication metformin would be beneficial as a disease-modifying and/or symptomatic therapy for AD, and conducted a placebo-controlled crossover study of its effects on cerebrospinal fluid (CSF), neuroimaging, and cognitive biomarkers...
April 2017: Alzheimer Disease and Associated Disorders
https://www.readbyqxmd.com/read/28537719/synthesis-and-characterization-of-the-lithium-rich-phosphidosilicates-li10si2p6-and-li3si3p7
#6
Henrik Eickhoff, Lorenzo Toffoletti, Wilhelm Klein, Gabriele Raudaschl-Sieber, Thomas F Fässler
The lithium phosphidosilicates Li10Si2P6 and Li3Si3P7 are obtained by high-temperature reactions of the elements or including binary Li-P precursors. Li10Si2P6 (P21/n, Z = 2, a = 7.2051(4) Å, b = 6.5808(4) Å, c = 11.6405(7) Å, β = 90.580(4)°) features edge-sharing SiP4 double tetrahedra forming [Si2P6](10-) units with a crystal structure isotypic to Na10Si2P6 and Na10Ge2P6. Li3Si3P7 (P21/m, Z = 2, a = 6.3356(4) Å, b = 7.2198(4) Å, c = 10.6176(6) Å, β = 102.941(6)°) crystallizes in a new structure type, wherein SiP4 tetrahedra are linked via common vertices and which are further connected by polyphosphide chains to form unique ∞(2)[Si3P7](3-) double layers...
May 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28537711/synthetic-textiles-as-a-source-of-microplastics-from-households-a-mechanistic-study-to-understand-microfiber-release-during-washing
#7
Edgar Hernandez, Bernd Nowack, Denise M Mitrano
Microplastic fibers make up a large proportion of microplastics found in the environment, especially in urban areas. There is good reason to consider synthetic textiles a major source of microplastic fibers and it will not diminish since the use of synthetic fabrics, especially polyester, continues to increase. In this study we provide quantitative data regarding the size and mass of microplastic fibers released from synthetic (polyester) textiles during simulated home washing under controlled laboratory conditions...
May 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28535340/optical-binding-of-nanowires
#8
Stephen H Simpson, Pavel Zemanek, Onofrio M Marago, Philip H Jones, Simon Hanna
Multiple scattering of light induces structured interactions, or optical binding forces, between collections of small particles. This has been extensively studied in the case of micro-spheres. However, binding forces are strongly shape dependent: here, we turn our attention to dielectric nanowires. Using a novel numerical model we uncover rich behaviour. The extreme geometry of the nanowires produces a sequence of stationary and dynamic states. In linearly polarized light, thermally stable ladder-like structures emerge...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28535338/a-flexible-lithium-ion-fiber-battery-by-regularly-stacking-two-dimensional-titanium-oxide-nanosheets-hybridized-with-reduced-graphene-oxide
#9
Tatsumasa Hoshide, Yuanchuan Zheng, Junyu Hou, Zhiqiang Wang, Qingwen Li, Zhigang Zhao, Renzhi Ma, Takayoshi Sasaki, Fengxia Geng
Increasing interest has recently been devoted to developing small, rapid, and portable electronic devices; thus, it is becoming critically important to provide matching light and flexible energy-storage systems to power them. To this end, compared with the inevitable drawbacks of being bulky, heavy, and rigid for traditional planar sandwiched structures, linear fiber-shaped lithium-ion batteries (LIB) have become increasingly important owing to their combined superiorities of miniaturization, adaptability, and weavability, the progress of which is heavily dependent on developing new fiber-shaped electrodes...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28535334/maximizing-the-photocatalytic-activity-of-metal-organic-frameworks-with-aminated-functionalized-linkers-sub-stoichiometric-effects-in-mil-125-nh2
#10
Matthew Chambers, Xia Wang, Laura Ellezam, Ovidiu Ersen, Marc Fontecave, Clément Sanchez, Laurence Rozes, Caroline Mellot-Draznieks
Despite the promise of utilizing metal-organic frameworks (MOFs) as highly tunable photocatalytic materials, systematic studies that interrogate the relationship between their catalytic performances and the amount of function-alized linkers are lacking. Aminated linkers are known to enhance the absorption of light and afford photocatalysis with MOFs under visible-light irradiation. However, the manner in which the photocatalytic performances are impacted by the amount of such linkers is poorly understood. Here, we assess the photocatalytic activity of MIL-125, a TiO2/1,4-benzenedicarboxylate (bdc) MOF for the oxidation of benzyl alcohol to benzaldehyde when increasing amounts of bdc-NH2 linkers (0%, 20%, 46%, 70% and 100%) are incorporated in the framework...
May 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28534618/microsecond-timescale-proton-rotating-frame-relaxation-under-magic-angle-spinning
#11
Petra Rovó, Rasmus Linser
This paper deals with the theoretical foundation of proton magic-angle-spinning rotating-frame relaxation (R1ρ) and establishes the range of validity and accuracy of the presented approach to describe low-amplitude microsecond timescale motion in the solid state. Beside heteronuclear dipolar and chemical shift anisotropy interactions, a major source of relaxation for protons is the homonuclear dipolar interaction. For this latter relaxation process no general analytical equation has been published until now which would describe the R1ρ relaxation at any spinning-speed, spin-lock field, or tilt-angle...
May 23, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28534587/light-induced-relaxation-dynamics-of-the-ferricyanide-ion-revisited-by-ultrafast-xuv-photoelectron-spectroscopy
#12
Nicholas Engel, Sergey I Bokarev, Alexandre Moguilevski, Azhr A Raheem, Ruba Al-Obaidi, Tobias Möhle, Gilbert Grell, Katrin R Siefermann, Bernd Abel, Saadullah G Aziz, Oliver Kühn, Mario Borgwardt, Igor Yu Kiyan, Emad F Aziz
Photoinduced charge transfer in transition-metal coordination complexes plays a prominent role in photosynthesis and is fundamental for light-harvesting processes in catalytic materials. However, revealing the relaxation pathways of charge separation remains a very challenging task because of the complexity of relaxation channels and ultrashort time scales. Here, we employ ultrafast XUV photoemission spectroscopy to monitor fine mechanistic details of the electron dynamics following optical ligand-to-metal charge-transfer excitation of ferricyanide in aqueous solution...
May 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28534574/syntheses-structures-and-magnetic-properties-of-a-family-of-end-on-azido-bridged-cu-ii-ln-iii-complexes
#13
Xing-Cai Huang, Xin-Hua Zhao, Dong Shao, Xin-Yi Wang
The reaction of Cu(valdmpn) (H2valdmpn = N,N'-bis-(3-methoxysalicylidene)-1,3-diamino-2,2-dimethylpropane), LnCl3·nH2O (Ln = La(1), Ce (2), Pr(3), Nd(4), Sm(5), Eu(6), Gd(7), Tb(8), Dy(9), Ho(10), Er(11), Tm(12), Yb(13), Lu(14)) and NaN3 in methanol led to a whole series of heterometallic Cu(II)-Ln(III) complexes. The basic structural components of these complexes are the [Cu(II)(valdmpn)Ln(III)] units with a compartmental Schiff-base ligand. These [Cu(II)Ln(III)] units were then further connected by the end-on (EO) azides between the Ln(3+) centers to form tetranuclear {[CuLn](μ-N3)n[LnCu]} motifs, where n is 3 for the complexes of larger radii lanthanides (1CuLa to 5CuSm) and 2 for the complexes of smaller radii lanthanides (6CuEu to 14CuLu)...
May 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28534567/intrinsic-ferromagnetism-and-quantum-anomalous-hall-effect-in-a-cobr2-monolayer
#14
Peng Chen, Jin-Yu Zou, Bang-Gui Liu
The electronic, magnetic, and topological properties of a CoBr2 monolayer are studied in the framework of density-functional theory (DFT) combined with tight-binding (TB) modeling in terms of the Wannier basis. Our DFT investigation and Monte Carlo simulation show that there exists intrinsic two-dimensional ferromagnetism in the CoBr2 monolayer, thanks to the large out-of-plane magnetocrystalline anisotropic energy. Our further study indicates that the spin-orbit coupling makes it become a topologically nontrivial insulator with a quantum anomalous Hall effect and topological Chern number [script C] = 4 and its edge states can be manipulated by changing the width of its nanoribbons and applying strains...
May 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28534404/competing-gap-opening-mechanisms-of-monolayer-graphene-and-graphene-nanoribbons-on-strong-topological-insulators
#15
Zhuonan Lin, Wei Qin, Jiang Zeng, Wei Chen, Ping Cui, Jun-Hyung Cho, Zhenhua Qiao, Zhenyu Zhang
Graphene is a promising material for designing next-generation electronic and valleytronic devices, which often demand the opening of a bandgap in the otherwise gapless pristine graphene. To date, several conceptually different mechanisms have been extensively exploited to induce bandgaps in graphene, including spin-orbit coupling and inversion symmetry breaking for monolayer graphene, and quantum confinement for graphene nanoribbons (GNRs). Here, we present a multiscale study of the competing gap opening mechanisms in a graphene overlayer and GNRs proximity-coupled to topological insulators (TIs)...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28534400/opto-valleytronic-spin-injection-in-monolayer-mos2-few-layer-graphene-hybrid-spin-valves
#16
Yunqiu Kelly Luo, Jinsong Xu, Tiancong Zhu, Guanzhong Wu, Elizabeth Joan McCormick, Wenbo Zhan, Mahesh R Neupane, Roland K Kawakami
Two dimensional (2D) materials provide a unique platform for spintronics and valleytronics due to the ability to combine vastly different functionalities into one vertically-stacked heterostructure, where the strengths of each of the constituent materials can compensate for the weaknesses of the others. Graphene has been demonstrated to be an exceptional material for spin transport at room temperature, however it lacks a coupling of the spin and optical degrees of freedom. In contrast, spin/valley polarization can be efficiently generated in monolayer transition metal dichalcogenides (TMD) such as MoS2 via absorption of circularly-polarized photons, but lateral spin or valley transport has not been realized at room temperature...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28534299/adsorption-onto-mesoporous-silica-using-supercritical-fluid-technology-improves-dissolution-rate-of-carbamazepine-a-poorly-soluble-compound
#17
Aditya V Gandhi, Priyanka Thipsay, Bharat Kirthivasan, Emilio Squillante
The purpose of this research was to design and characterize an immediate-release formulation of carbamazepine (CBZ), a poorly soluble anti-epileptic drug, using a porous silica carrier. Carbon dioxide in its supercritical state (2000 psi, 30-35°C) was used as an anti-solvent to precipitate CBZ onto two particle size variants of silica. Adsorption isotherms were used as a pre-formulation strategy to select optimum ratios of silica and CBZ. The obtained drug-silica formulations were characterized by dissolution studies, differential scanning calorimetry (DSC), powder X-ray diffraction (PXRD), and scanning electron microscopy (SEM)...
May 22, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28534200/atrophy-of-calf-muscles-by-unloading-results-in-an-increase-of-tissue-sodium-concentration-and-fat-fraction-decrease-a-23-na-mri-physiology-study
#18
D A Gerlach, K Schopen, P Linz, B Johannes, J Titze, J Zange, J Rittweger
PURPOSE: (23)Na MRI demonstrated increased tissue sodium concentrations in a number of pathologies. Acute atrophy results in muscle fibre volume shrinking that may result in a relative increase of extracellular volume and might affect sodium concentration. Thus, we hypothesized that local unloading of the calf muscles would lead to a decrease in muscle volume and an increase in muscle tissue sodium concentration. METHOD: One lower leg of 12 healthy male subjects was submitted to a 60 day long period of unloading using the Hephaistos orthosis, while the other leg served as control...
May 22, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28534082/conformational-dynamics-and-alignment-properties-of-loop-lanthanide-binding-tags-lbts-studied-in-interleukin-1%C3%AE
#19
Dominic Barthelmes, Katja Barthelmes, Kai Schnorr, Hendrik R A Jonker, Bianca Bodmer, Karen N Allen, Barbara Imperiali, Harald Schwalbe
Encodable lanthanide binding tags (LBTs) have become an attractive tool in modern structural biology as they can be expressed as fusion proteins of targets of choice. Previously, we have demonstrated the feasibility of inserting encodable LBTs into loop positions of interleukin-1β (Barthelmes et al. in J Am Chem Soc 133:808-819, 2011). Here, we investigate the differences in fast dynamics of selected loop-LBT interleukin-1β constructs by measuring (15)N nuclear spin relaxation experiments. We show that the loop-LBT does not significantly alter the dynamic motions of the host protein in the sub-τc-timescale and that the loop-LBT adopts a rigid conformation with significantly reduced dynamics compared to the terminally attached encodable LBT leading to increased paramagnetic alignment strength...
May 22, 2017: Journal of Biomolecular NMR
https://www.readbyqxmd.com/read/28532471/perfusion-by-arterial-spin-labelling-following-single-dose-tadalafil-in-small-vessel-disease-pastis-study-protocol-for-a-randomised-controlled-trial
#20
Mathilde M H Pauls, Natasha Clarke, Sarah Trippier, Shai Betteridge, Franklyn A Howe, Usman Khan, Christina Kruuse, Jeremy B Madigan, Barry Moynihan, Anthony C Pereira, Debbie Rolfe, Egill Rostrup, Caroline E Haig, Thomas R Barrick, Jeremy D Isaacs, Atticus H Hainsworth
BACKGROUND: Cerebral small vessel disease is a common cause of vascular cognitive impairment in older people, with no licensed treatment. Cerebral blood flow is reduced in small vessel disease. Tadalafil is a widely prescribed phosphodiesterase-5 inhibitor that increases blood flow in other vascular territories. The aim of this trial is to test the hypothesis that tadalafil increases cerebral blood flow in older people with small vessel disease. METHODS/DESIGN: Perfusion by Arterial Spin labelling following Single dose Tadalafil In Small vessel disease (PASTIS) is a phase II randomised double-blind crossover trial...
May 22, 2017: Trials
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