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https://www.readbyqxmd.com/read/28817073/extended-physicochemical-characterization-of-the-synthetic-anticoagulant-pentasaccharide-fondaparinux-sodium-by-quantitative-nmr-and-single-crystal-x-ray-analysis
#1
William de Wildt, Huub Kooijman, Carel Funke, Bülent Üstün, Afranina Leika, Maarten Lunenburg, Frans Kaspersen, Edwin Kellenbach
Fondaparinux sodium is a synthetic pentasaccharide representing the high affinity antithrombin III binding site in heparin. It is the active pharmaceutical ingredient of the anticoagulant drug Arixtra(®). The single crystal X-ray structure of Fondaparinux sodium is reported, unequivocally confirming both structure and absolute configuration. The iduronic acid adopts a somewhat distorted chair conformation. Due to the presence of many sulfur atoms in the highly sulfated pentasaccharide, anomalous dispersion could be applied to determine the absolute configuration...
August 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28811536/ige-trimers-drive-spe-7-cytokinergic-activity
#2
Heather J Bax, Holly Bowen, Rebecca L Beavil, Raymond Chung, Malcolm Ward, Anna M Davies, Tihomir S Dodev, James M McDonnell, Andrew J Beavil, Brian J Sutton, Hannah J Gould
Degranulation of mast cells and basophils, with release of agents of the allergic response, ensues when multivalent antigens bind to and cross-link the cells' receptor-bound IgE antibodies. A widely used commercial monoclonal IgE antibody, SPE-7 IgE from Sigma, was found to possess the radically anomalous property, termed "cytokinergic", of inducing basophil degranulation without the intervention of an antigen. We show here that the IgE monomer, freed of protein contaminants, is devoid of this activity, and that the source of the anomaly is a trace impurity, identified as a dissociation-resistant IgE trimer...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811518/anomalous-in-situ-activation-of-carbon-supported-ni2p-nanoparticles-for-oxygen-evolving-electrocatalysis-in-alkaline-media
#3
Young-Hoon Chung, Injoon Jang, Jue-Hyuk Jang, Hyun S Park, Hyung Chul Ham, Jong Hyun Jang, Yong-Kul Lee, Sung Jong Yoo
Electrochemical water splitting is one of the most promising systems by which to store energy produced from sustainable sources, such as solar and wind energy. Designing robust and stable electrocatalysts is urgently needed because of the relatively sluggish kinetics of the anodic reaction, i.e. the oxygen evolution reaction (OER). In this study, we investigate the anomalous in situ activation behaviour of carbon-supported Ni2P nanoparticles (Ni2P/C) during OER catalysis in alkaline media. The activated Ni2P/C shows an exceptionally high activity and stability under OER conditions in which the overpotential needed to achieve 10 mA cm(-2) was reduced from approximately 350 mV to approximately 300 mV after 8,000 cyclic voltammetric scans...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811484/sea-of-majorana-fermions-from-pseudo-scalar-superconducting-order-in-three-dimensional-dirac-materials
#4
Morteza Salehi, S A Jafari
We suggest that spin-singlet pseudo-scalar s-wave superconducting pairing creates a two dimensional sea of Majorana fermions on the surface of three dimensional Dirac superconductors (3DDS). This pseudo-scalar superconducting order parameter Δ5, in competition with scalar Dirac mass m, leads to a topological phase transition due to band inversion. We find that a perfect Andreev-Klein reflection is guaranteed by presence of anomalous Andreev reflection along with the conventional one. This effect manifests itself in a resonant peak of the differential conductance...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28810755/anomalous-critical-slowdown-at-a-first-order-phase-transition-in-single-polymer-chains
#5
Shuangshuang Zhang, Shuanhu Qi, Leonid I Klushin, Alexander M Skvortsov, Dadong Yan, Friederike Schmid
Using Brownian dynamics, we study the dynamical behavior of a polymer grafted onto an adhesive surface close to the mechanically induced adsorption-stretching transition. Even though the transition is first order (in the infinite chain length limit, the stretching degree of the chain jumps discontinuously), the characteristic relaxation time is found to grow according to a power law as the transition point is approached. We present a dynamic effective interface model which reproduces these observations and provides an excellent quantitative description of the simulation data...
August 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28810532/plga-ctab-curcumin-nanoparticles-fabrication-characterization-and-molecular-basis-of-anticancer-activity-in-triple-negative-breast-cancer-cell-lines-mda-mb-231-cells
#6
Ramovatar Meena, Sumit Kumar, Raj Kumar, Usha Singh Gaharwar, Paulraj Rajamani
Triple-negative breast cancers (TNBC) are aggressive cancers, which do not control by hormonal therapy or therapies that target HER-2 receptors. Curcumin (Cur) has shown cytotoxic effects in multiple cancer cell lines. However, its medical uses remain limited due to low aqueous solubility and poor bioavailability. Therefore, present study was aimed to fabricate the small positive charge curcumin nanoparticles (CN) by nanoprecipitation methods using PLGA and CTAB, and to evaluate its anticancer efficacy and underlying the mechanism in triple negative breast cancer cell lines (MDA-MB-231 cells)...
August 11, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28806489/characteristics-of-spontaneous-births-attended-by-midwives-and-physicians-in-us-hospitals-in-2014
#7
Patrick Thornton
INTRODUCTION: This study compares characteristics and birth outcomes of women attended by certified nurse-midwives/certified midwives (midwives) and physicians in US hospitals in 2014. METHODS: Data reported in 2014 on the 2003 version of the US birth certificate were examined. Spontaneous vaginal births attributed to midwives and physicians and occurring in hospitals were included. Demographic and risk profiles and adjusted odds ratios for maternal and newborn outcomes were compared by provider type...
August 14, 2017: Journal of Midwifery & Women's Health
https://www.readbyqxmd.com/read/28805873/emission-color-tuning-of-core-shell-upconversion-nanoparticles-through-modulation-of-laser-power-or-temperature
#8
Qiyue Shao, Gongtuo Zhang, Lilai Ouyang, Yanqing Hu, Yan Dong, Jianqing Jiang
Upconversion nanoparticles (UCNPs) are an excellent choice to construct security features against counterfeiting, owing to their unique NIR-to-VIS upconversion luminescence (UCL) characteristics. However, the application of upconversion materials is limited, due to their single and invariant emission colors. Herein, the temperature-dependent UCL properties of NaGdF4:Yb/Ho (or Tm) UCNPs in the solid state have been investigated. An anomalous UCL enhancement at higher temperatures has been demonstrated for these small-sized (<10 nm) UCNPs and the underlying mechanism is discussed herein...
August 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28805860/synthesis-of-n-doped-graphene-quantum-dots-by-pulsed-laser-ablation-with-diethylenetriamine-deta-and-their-photoluminescence
#9
S R M Santiago, T N Lin, C H Chang, Y A Wong, C A J Lin, C T Yuan, J L Shen
We report a facile, fast, and one-step approach to prepare N-doped graphene quantum dots (GQDs) using pulsed laser ablation with diethylenetriamine (DETA). The synthesized N-doped GQDs with an average size of about 3.4 nm and an N/C atomic ratio of 26% have been demonstrated. Compared to pristine GQDs, the N-doped GQDs emit enhanced photoluminescence (PL) with a factor as high as 66, originated from the enhanced densities of pyridinic and graphitic N. The temperature-dependent PL of the N-doped GQDs was studied from cryogenic to room temperature...
August 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28805847/probing-nanoscale-functionalities-of-metal-organic-framework-nanocrystals
#10
Yao Sun, Zhigang Hu, Dan Zhao, Kaiyang Zeng
Experimental investigation of functional properties of metal-organic frameworks (MOFs) at nanoscale precision is challenging and rarely reported. In this study, we report the piezo- and ferroelectric properties of NUS-6 MOF nanocrystals using dual AC resonance tracking piezoresponse force microscopy and piezoresponse force spectroscopy for the first time. Both NUS-6-(Hf) and NUS-6-(Zr) nanocrystals displayed anomalous piezoelectricity with the calculated piezoelectric coefficient dzz constants of 2.0-3.5 pm V(-1) and 1...
August 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28803972/self-aggregation-behavior-of-hydrophobic-sodium-alginate-derivatives-in-aqueous-solution-and-their-application-in-the-nanoencapsulation-of-acetamiprid
#11
Xinyu Zhao, Jiacheng Li, Yuhong Feng, Gaobo Yu, Qingfeng Zhou, Furui He, Dunchao Xiao, Kai Chen, Lei Zhang
In this study, cholesteryl-grafted sodium alginate derivatives (CSAD) with different molecular weights were synthesized by esterification. The structure of CSAD was confirmed by FT-IR and (1)H NMR spectrometers. The effects of pH and CSAD polymer concentration on the self-assembled behavior and particle size of CSAD were investigated by fluorescence measurement (FM) and dynamic light scattering (DLS). In the presence of Ca(2+), the cholesteryl-grafted sodium alginate derivative was used for fabricating self-assembled nanoparticles that can effectively encapsulate the drug acetamiprid...
August 10, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28803801/st-elevation-myocardial-infarction-in-patients-with-anomalous-left-main-coronary-artery-case-series-and-review-of-the-literature
#12
REVIEW
Nicholas J Whitehead, Allan J Davies, Michael McGee, Nicholas J Collins
Anomalous left main coronary artery is rare. We present four cases where anomalous left main coronary artery was diagnosed during emergent cardiac catheterization for ST elevation myocardial infarction. Procedural characteristics, technical challenges, and relevant literature are discussed.
July 14, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/28802237/umbelliferon-%C3%AE-d-glucopyranosyl-2-i-%C3%A2-1-ii-%C3%AE-dglucopyranoside-ameliorates-diethylnitrosamine-induced-precancerous-lesion-development-in-liver-via-regulation-of-inflammation-hyperproliferation-and-antioxidant-at-pre-clinical-stage
#13
Vikas Kumar, Prakash Chandra Bhatt, Mahfoozur Rahman, Fahad A Al-Abbasi, Firoz Anwar, Amita Verma
It is well documented that anomalous production of inflammatory proteins linked with most of the toxic expression and genesis of diverse chronic disease including cancer. Diethylnitrosamine (DEN) a well-known hepatotoxin and hepatocarcinogen, can induce oxidative stress and inflammatory reaction in it. Umbelliferone, secondary metabolites, is present in different plants and widely consumed by humans as medicine and food supplements. The aim of the current study was to scrutinize the chemoprotective potential of umbelliferon-α-d-glucopyranosyl-(2(I)→1(II))-α-d-glucopyranoside (UFD) against DEN-induced hepatocellular carcinoma (HCC) in experimental rats...
August 9, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28802038/trem2-maintains-microglial-metabolic-fitness-in-alzheimer-s-disease
#14
Tyler K Ulland, Wilbur M Song, Stanley Ching-Cheng Huang, Jason D Ulrich, Alexey Sergushichev, Wandy L Beatty, Alexander A Loboda, Yingyue Zhou, Nigel J Cairns, Amal Kambal, Ekaterina Loginicheva, Susan Gilfillan, Marina Cella, Herbert W Virgin, Emil R Unanue, Yaming Wang, Maxim N Artyomov, David M Holtzman, Marco Colonna
Elevated risk of developing Alzheimer's disease (AD) is associated with hypomorphic variants of TREM2, a surface receptor required for microglial responses to neurodegeneration, including proliferation, survival, clustering, and phagocytosis. How TREM2 promotes such diverse responses is unknown. Here, we find that microglia in AD patients carrying TREM2 risk variants and TREM2-deficient mice with AD-like pathology have abundant autophagic vesicles, as do TREM2-deficient macrophages under growth-factor limitation or endoplasmic reticulum (ER) stress...
August 10, 2017: Cell
https://www.readbyqxmd.com/read/28801609/micro-to-nano-scale-filling-behavior-of-pmma-during-imprinting
#15
Jingmin Li, Ziyang Liu, Chao Liang, Xia Li, Jinguang Fan, Hao Zhang, Chong Liu
The filling behavior of polymers in narrow gaps or small pores is important for the dynamics of polymeric micro/nanostructure fabrication. Here, the filling behavior, the mechanical properties, and the stress versus strain relationship of 996 kD poly (methyl methacrylate) (PMMA) at a scale from micron to molecular confinement are measured. It has been found that the solid polymer exhibits elastic-plastic dominant deformation behavior at micron scale. As the scale reduces to submicron, the resistance to deformation of the polymeric solid has a pronounced reduction...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800752/a-type-i-combi-targeting-approach-for-the-design-of-molecules-with-enhanced-potency-against-brca1-2-mutant-and-o6-methylguanine-dna-methyltransferase-mgmt-expressing-tumour-cells
#16
Zhor Senhaji Mouhri, Elliot Goodfellow, Bertrand Jean-Claude
BACKGROUND: Mutations of the DNA repair proteins BRCA1/2 are synthetically lethal with the DNA repair enzyme poly(ADP-ribose) polymerase (PARP), which when inhibited, leads to cell death due to the absence of compensatory DNA repair mechanism. The potency of PARP inhibitors has now been clinically proven. However, disappointingly, acquired resistance mediated by the reactivation of wild type BRCA1/2 has been reported. In order to improve their efficacy, trials are ongoing to explore their combinations with temozolomide (TMZ)...
August 11, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28799375/comparison-of-liquid-state-anomalies-in-stillinger-weber-models-of-water-silicon-and-germanium
#17
Debdas Dhabal, Charusita Chakravarty, Valeria Molinero, Hemant K Kashyap
We use molecular dynamics simulations to compare and contrast the liquid-state anomalies in the Stillinger-Weber models of monatomic water (mW), silicon (Si), and germanium (Ge) over a fairly wide range of temperatures and densities. The relationships between structure, entropy, and mobility, as well as the extent of the regions of anomalous behavior, are discussed as a function of the degree of tetrahedrality. We map out the cascade of density, structural, pair entropy, excess entropy, viscosity, and diffusivity anomalies for these three liquids...
December 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28799177/racemic-and-enantiopure-forms-of-3-ethyl-3-phenylpyrrolidin-2-one-adopt-very-different-crystal-structures
#18
Arcadius V Krivoshein, Sergey V Lindeman, Tatiana V Timofeeva, Victor N Khrustalev
3-Ethyl-3-phenylpyrrolidin-2-one (EPP) is an experimental anticonvulsant based on the newly proposed α-substituted amide group pharmacophore. These compounds show robust activity in animal models of drug-resistant epilepsy and are thus promising for clinical development. In order to understand pharmaceutically relevant properties of such compounds, we are conducting an extensive investigation of their structures in the solid state. In this article, we report chiral high-performance liquid chromatography (HPLC) separation, determination of absolute configuration of enantiomers, and crystal structures of EPP...
August 11, 2017: Chirality
https://www.readbyqxmd.com/read/28798853/simulations-of-knotting-of-dna-during-genome-mapping
#19
Aashish Jain, Kevin D Dorfman
Genome mapping involves the confinement of long DNA molecules, in excess of 150 kilobase pairs, in nanochannels near the circa 50 nm persistence length of DNA. The fidelity of the map relies on the assumption that the DNA is linearized by channel confinement, which assumes the absence of knots. We have computed the probability of forming different knot types and the size of these knots for long chains (approximately 164 kilobase pairs) via pruned-enriched Rosenbluth method simulations of a discrete wormlike chain model of DNA in channel sizes ranging from 35 nm to 60 nm...
March 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28798671/bodily-sensory-inputs-and-anomalous-bodily-experiences-in-complex-regional-pain-syndrome-evaluation-of-the-potential-effects-of-sound-feedback
#20
Ana Tajadura-Jiménez, Helen Cohen, Nadia Bianchi-Berthouze
Neuroscientific studies have shown that human's mental body representations are not fixed but are constantly updated through sensory feedback, including sound feedback. This suggests potential new therapeutic sensory approaches for patients experiencing body-perception disturbances (BPD). BPD can occur in association with chronic pain, for example in Complex Regional Pain Syndrome (CRPS). BPD often impacts on emotional, social, and motor functioning. Here we present the results from a proof-of-principle pilot study investigating the potential value of using sound feedback for altering BPD and its related emotional state and motor behavior in those with CRPS...
2017: Frontiers in Human Neuroscience
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