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https://www.readbyqxmd.com/read/29349455/on-the-h2-interactions-with-transition-metal-adatoms-supported-on-graphene-a-systematic-density-functional-study
#1
Montserrat Manadé, Francesc Viñes, Adrià Gil, Francesc Illas
The attachment of H2 to the full set of transition metal (TM) adatoms supported on graphene is studied by using density functional theory. Methodology validation calculations on the interactions of H2 with benzene and graphene show that any of the vdW corrections under study, the Grimme D2, D3, D3 with Becke-Jonson damping (D3BJ), and Tkatchenko-Scheffler methods, applied on the PBE functional, are similarly accurate in describing such subtle interactions, with an accuracy of almost 2 kJ mol-1 compared to experiments...
January 19, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29344877/a-bioluminescent-test-system-reveals-valuable-antioxidant-properties-of-lactobacillus-strains-from-human-microbiota
#2
Maria Marsova, Serikbay Abilev, Elena Poluektova, Valeriy Danilenko
Oxidative stress cause serious damages in human organism resulting in multiple diseases. Antioxidant therapy includes diet, the use of chemical agents or commensal bacteria such as lactobacilli. This study aims to evaluate the antioxidant (AO) activity of cell-free culture supernatants of lactobacilli, isolated from different parts of the human body. A test system based on Escherichia coli MG1655 strains carrying plasmids encoding luminescent biosensors pSoxS-lux and pKatG-lux inducible by superoxide anion and hydrogen peroxide, respectively, was used to analyze cell-free culture supernatants of lactobacilli...
January 17, 2018: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/29338274/frequency-and-correlation-of-lip-prints-fingerprints-and-abo-blood-groups-in-population-of-sriganganagar-district-rajasthan
#3
Harpreet Sandhu, Pradhuman Verma, Sarfaraz Padda, Seetharamaiha Sunder Raj
OBJECTIVE: To investigate the frequency and uniqueness of different lip print patterns, fingerprint patterns in relation to gender and ABO Rh blood groups among a semi-urban population of Sriganganagar, Rajasthan. MATERIALS AND METHODS: The study was conducted on 1200 healthy volunteers aged 18-30 years. The cheiloscopic and dermatographic data of each subject were obtained and were analysed according to the Suzuki and Tsuchihashi and Henry systems of classification, respectively...
November 2017: Acta Medica Academica
https://www.readbyqxmd.com/read/29334611/understanding-complex-tribofilms-by-means-of-h3bo3-b2o3-model-glasses
#4
Fabiana Spadaro, Antonella Rossi, Shivaprakash N Ramakrishna, Emmanuel Lainé, Philip Woodward, Nicholas D Spencer
The discovery of the spontaneous reaction of boric oxides with moisture in the air to form lubricious H3BO3 films has led to great interest in the tribology of boron compounds in general. Despite this, a study of the growth kinetics of H3BO3 on a B2O3 substrate under controlled relative humidity (RH), has not yet been reported in the literature. Here, we describe the tribological properties of H3BO3-B2O3 glass systems after aging under controlled relative humidity over different lengths of time. A series of tribological tests has been performed applying a normal load of 15 N, at both room temperature and 100°C in Yubase 4 oil...
January 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29330014/frequency-of-red-blood-cell-genotypes-in-multi-transfused-patients-and-blood-donors-from-minas-gerais-southeast-brazil
#5
Vitor Mendonça Alves, Fernanda Bernadelli De Vito, Paulo Roberto Juliano Martins, Sheila Soares Silva, Lilian Castilho, Helio Moraes-Souza
BACKGROUND AND OBJECTIVES: The frequency of red blood cell (RBC) antigens in Brazil varies due to differences in the ethnic groups in different regions; however, these studies have not been performed in Minas Gerais, where African admixture is more prevalent in comparison with other states. Due to these facts, this study aimed to determine the frequency of RBC genotypes on Rh, Kell, Duffy and Kidd systems in blood donors and multi-transfused patients from Minas Gerais, Southeast Brazil...
December 16, 2017: Transfusion and Apheresis Science
https://www.readbyqxmd.com/read/29323112/signaling-ammonium-across-membranes-through-an-ammonium-sensor-histidine-kinase
#6
Tobias Pflüger, Camila F Hernández, Philipp Lewe, Fabian Frank, Haydyn Mertens, Dmitri Svergun, Manfred W Baumstark, Vladimir Y Lunin, Mike S M Jetten, Susana L A Andrade
Sensing and uptake of external ammonium is essential for anaerobic ammonium-oxidizing (anammox) bacteria, and is typically the domain of the ubiquitous Amt/Rh ammonium transporters. Here, we report on the structure and function of an ammonium sensor/transducer from the anammox bacterium "Candidatus Kuenenia stuttgartiensis" that combines a membrane-integral ammonium transporter domain with a fused histidine kinase. It contains a high-affinity ammonium binding site not present in assimilatory Amt proteins. The levels of phosphorylated histidine in the kinase are coupled to the presence of ammonium, as conformational changes during signal recognition by the Amt module are transduced internally to modulate the kinase activity...
January 11, 2018: Nature Communications
https://www.readbyqxmd.com/read/29317874/molecular-cloning-expression-and-characterization-of-plasmid-encoding-rhomboid-4-rom4-of-tachyzoite-of-toxoplasma-gondii-rh-strain
#7
Mohammad Taghi Rahimi, Shahabeddin Sarvi, Mahdi Sharif, Saeid Abediankenari, Ehsan Ahmadpour, Reza Valadan, Ahmad Daryani
Background: The objective of this study was to clone, express and characterize the gene encoding rhomboid 4 (ROM4) proteins, a vital gene in surface adhesion and host cell invasion process of tachyzoite of T. gondii in an appropriate expression vector and eukaryotic cell for production of recombinant protein. Methods: Toxoplasma RNA was isolated from tachyzoites (RH strain) and complementary DNA was synthesized. Oligonucleotide primer pair was designed based on Toxoplasma ROM4 gene sequence with XhoI and EcoRI restriction sites at 5' end of forward and reverse primers, respectively...
October 2017: Iranian Journal of Parasitology
https://www.readbyqxmd.com/read/29317481/iaps-cause-resistance-to-trail-dependent-apoptosis-in-follicular-thyroid-cancer
#8
Thomas Artur Werner, Inga Nolten, Levent Dizdar, Jasmin Riemer, Sina Christin Schütte, Pablo Emilio Verde, Katharina Raba, Matthias Schott, Wolfram Trudo Knoefel, Andreas Krieg
Follicular thyroid cancer's (FTC) excellent long-term prognosis is mainly dependent on complete surgical removal and postoperative radioactive iodine (RAI) treatment. However, once the tumour becomes RAI refractory the 10-year disease specific survival rate drops below 10 %. The aim of our study was to evaluate the prognostic and biological role of the TRAIL system in FTC and to elucidate the influence of small molecule mediated antagonization of inhibitor of apoptosis proteins (IAPs) on TRAIL-sensitivity in vitro...
January 9, 2018: Endocrine-related Cancer
https://www.readbyqxmd.com/read/29306191/investigations-on-the-micellization-of-amphiphilic-dendritic-copolymers-from-unimers-to-micelles
#9
Cuiyun Zhang, Huipeng Zhou, Yongxin Li, Yunyi Zhang, Cong Yu, Hongfei Li, Yu Chen, Ian W Hamley, Shichun Jiang
Since the micellization kinetics is influenced by polymer structure, the spherical three-dimensional topology of amphiphilic dendritic copolymers (ADPs) which hinders the phase separation during micellization is assumed to make the micellization kinetics different. In the literatures, most of the attention has been paid to the morphology transition or the morphology at equilibrium and the micellization kinetics of ADPs is rarely reported. In this study, the micellization processes of amphiphilic dendritic copolymers from unimers to the final equilibrium micelles were monitored by laser light scattering...
December 27, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29303524/multiple-binding-modes-of-an-unconjugated-bis-pyridine-ligand-stabilize-low-valent-cp-rh-complexes
#10
Davide Lionetti, Victor W Day, Benedikt Lassalle-Kaiser, James D Blakemore
The ligand 2,2'-bipyridine (bpy) can support metal centers in low formal oxidation states by delocalization of electron density into its π-system. We show that, in a model rhodium complex supported by the pentamethylcyclopentadienyl ligand (Cp*), the analogous dimethyldipyridylmethane ligand (Me2dpma) enforces a bpy-like coordination environment but disrupts the inter-ring conjugation responsible for charge delocalization upon metal reduction. As a result, reduction proceeds in discrete one-electron steps (Rh(iii) to Rh(ii) to Rh(i)), contrasting with the 2e- chemistry engendered by bpy...
January 5, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29296782/whole-exome-sequencing-for-rh-genotyping-and-alloimmunization-risk-in-children-with-sickle-cell-anemia
#11
Stella T Chou, Jonathan M Flanagan, Sunitha Vege, Naomi L C Luban, R Clark Brown, Russell E Ware, Connie M Westhoff
RH genes are highly polymorphic and encode the most complex of the 35 human blood group systems. This genetic diversity contributes to Rh alloimmunization in patients with sickle cell anemia (SCA) and is not avoided by serologic Rh-matched red cell transfusions. Standard serologic testing does not distinguish variant Rh antigens. Single nucleotide polymorphism (SNP)-based DNA arrays detect many RHD and RHCE variants, but the number of alleles tested is limited. We explored a next-generation sequencing (NGS) approach using whole-exome sequencing (WES) in 27 Rh alloimmunized and 27 matched non-alloimmunized patients with SCA who received chronic red cell transfusions and were enrolled in a multicenter study...
August 8, 2017: Blood Advances
https://www.readbyqxmd.com/read/29290462/-retinal-hemangioblastoma-treatment-strategy-and-long-term-follow-up-in-a-retrospective-cohort
#12
A Lefevre, T Mathis, P Denis, L Kodjikian
INTRODUCTION: Retinal hemangioblastoma (RH) is a benign vascular tumor frequently associated with Von Hippel-Lindau disease (VHL). Tumor growth of RH may lead to deterioration of visual acuity, which can be difficult to treat. Early diagnosis may reduce complication rate and side effects of treatment. The present retrospective study evaluates the long-term follow-up and complications of RH treatment as a function of the therapeutic strategy used. MATERIALS AND METHODS: The study included patients with RH, followed at Croix Rousse university hospital, Lyon between 2010 and 2017...
December 28, 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/29289996/vineyard-microclimate-and-yield-under-different-plastic-covers
#13
Ester Holcman, Paulo Cesar Sentelhas, Marco Antônio Fonseca Conceição, Hilton Thadeu Zarate Couto
The use of plastic cover in vineyards minimizes effects of adverse weather conditions. The northwest of São Paulo State is one of the largest grape producing regions in Brazil; however, few studies investigate the effects of different plastic covers on vineyards in this region. This study compared the effect of black shading screen (BSS) and braided polypropylene film (BPF) on BRS Morena vineyard microclimate, grown on an overhead trellis system in the northwestern São Paulo. The experiments were carried out during three growing seasons (2012-2014)...
December 30, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/29287767/resistant-hypertension-renal-denervation-or-intensified-medical-treatment
#14
REVIEW
Alberto Morganti, Giuseppe Mancia
Resistant hypertension (RH) can be diagnosed if blood pressure (BP) is not controlled with the combination of three antihypertensive drugs, including a diuretic, all at effective doses. Patients affected by this condition exhibit a marked increase in the risk of cardiovascular and renal morbid and fatal events. They also exhibit an increased activity of the sympathetic nervous system which is likely to importantly contribute at the renal and other vascular levels to the hypertensive state. Almost 10years ago renal denervation (RDN) by radiofrequency thermal energy delivery to the walls of the renal arteries was proposed for the treatment of RH...
December 27, 2017: European Journal of Internal Medicine
https://www.readbyqxmd.com/read/29286647/the-dehydropolymerization-of-h3b%C3%A2-nmeh2-to-form-polyaminoboranes-using-rh-xantphos-alkyl-catalysts
#15
Gemma M Adams, Annie Louise Colebatch, Joseph T Skornia, Alasdair I McKay, Heather C Johnson, Guy C Lloyd-Jones, Stuart A Macgregor, Nicholas A Beattie, Andrew S Weller
A systematic study of catalyst structure and charge for the dehydropolymerization of H3B•NMeH2 to form N-methylpolyaminoborane is reported using catalysts based upon neutral and cationic {Rh(Xantphos-R}} fragments, in which PR2 groups are selected from Et, iPr and tBu. The most efficient systems are based upon {Rh(Xantphos-iPr}}, i.e. [Rh(3-P,O,P-Xantphos-iPr)(H)2(2-H3B•NMe3)][BArF4], 6, and Rh(3-P,O,P-Xantphos-iPr)H, 11. While H2 evolution kinetics show both are fast catalysts (ToF ~ 1500 hr-1), and polymer growth kinetics for dehydropolymerization suggest a classical chain growth process for both, neu-tral 11 (Mn = 28,000 g mol-1, Ð = 1...
December 29, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29251389/water-stable-nanoporous-polymer-films-with-excellent-proton-conductivity
#16
Zhengbang Wang, Cong Liang, Haolin Tang, Sylvain Grosjean, Artak Shahnas, Joerg Lahann, Stefan Bräse, Christof Wöll
Achieving high values for proton conductivity in a material critically depends on providing hopping sites arranged in a regular fashion. Record values reported for regular, molecular crystals cannot yet be reached by technologically relevant systems, and the best values measured for polymer membranes suited for integration into devices are almost two orders of magnitude lower. Here, an alternative polymer membrane synthesis strategy based on the chemical modification of surface-mounted, monolithic, crystalline metal-organic framework thin films is demonstrated...
December 18, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29246439/development-of-solidified-self-microemulsifying-drug-delivery-systems-containing-l-tetrahydropalmatine-design-of-experiment-approach-and-bioavailability-comparison
#17
Nguyen-Thach Tung, Cao-Son Tran, Thi-Minh-Hue Pham, Hoang-Anh Nguyen, Tran-Linh Nguyen, Sang-Cheol Chi, Dinh-Duc Nguyen, Thi-Bich-Huong Bui
The study first aimed to apply a design of experiment (DoE) approach to investigate the influences of excipients on the properties of liquid self-microemulsifying drug delivery system (SMEDDS) and SMEDDS loaded in the pellet (pellet-SMEDDS) containing l-tetrahydropalmatine (l-THP). Another aim of the study was to compare the bioavailability of l-THP suspension, liquid SMEDDS and pellet-SMEDDS in the rabbit model. By using Central Composite Face design (CCF), the optimum ratio of Capryol 90, and Smix `(Cremophor RH 40: Transcutol HP) in the formulation of SMEDDS was determined...
December 12, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29243119/action-observation-or-imitation-of-virtual-hand-movement-affect-differently-regions-of-the-mirror-neuron-system-and-the-default-mode-network
#18
Nabila Brihmat, Mohamed Tarri, Yann Quidé, Ketty Anglio, Bernard Pavard, Evelyne Castel-Lacanal, David Gasq, Xavier De Boissezon, Philippe Marque, Isabelle Loubinoux
Virtual reality (VR)-based paradigms use visual stimuli that can modulate visuo-motor networks leading to the stimulation of brain circuits. The aims of this study were to compare the changes in blood-oxygenation level dependent (BOLD) signal when watching and imitating moving real (RH) and virtual hands (VH) in 11 healthy participants (HP). No differences were found between the observation of RH or VH making this VR-based experiment a promising tool for rehabilitation protocols. VH-imitation involved more the ventral premotor cortex (vPMC) as part of the mirror neuron system (MNS) compared to execution and VH-observation conditions...
December 14, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29224338/dynamic-behavior-of-rh-species-of-rh-al2o3-model-catalyst-during-three-way-catalytic-reaction-an-operando-xas-study
#19
Hiroyuki Asakura, Saburo Hosokawa, Toshiaki Ina, Kazuo Kato, Kiyofumi Nitta, Kei Uera, Tomoya Uruga, Hiroki Miura, Tetsuya Shishido, Jun-Ya Ohyama, Atsushi Satsuma, Katsutoshi Sato, Akira Yamamoto, Satoshi Hinokuma, Hiroshi Yoshida, Masato Machida, Seiji Yamazoe, Tatsuya Tsukuda, Kentaro Teramura, Tsunehiro Tanaka
The dynamic behavior of Rh species in 1 wt% Rh/Al2O3 catalyst during the three-way catalytic reaction was examined using a micro gas chromatograph, a NOx meter, a quadrupole mass spectrometer, and time-resolved quick X-ray absorption spectroscopy (XAS) measurements at a public beamline for XAS, BL01B1 at SPring-8, operando. The combined data suggest different surface rearrangement behavior, random reduction processes, and autocatalytic oxidation processes of Rh species when the gas is switched from a reductive to an oxidative atmosphere and vice versa...
December 11, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29216463/application-of-double-focusing-sector-field-icp-ms-for-determination-of-ultratrace-constituents-in-samples-characterized-by-complex-composition-of-the-matrix
#20
Ilia Rodushkin, Cora Paulukat, Simon Pontér, Emma Engström, Douglas C Baxter, Dieke Sörlin, Nicola Pallavicini, Katerina Rodushkina
The performance of double focusing, sector field mass spectrometry (ICP-SFMS) for determination of analytes, including technology critical elements (TCE), at ultra-trace levels in environmental and clinical matrices was critically evaluated. Different configurations of the ICP-SFMS introduction system as well as various sample preparations, pre-concentration and matrix separation methods were employed and compared. Factors affecting detection capabilities and accuracy of data produced (instrumental sensitivity, contamination risks, purity of reagents, spectral interferences, matrix effects, analyte recovery and losses) were discussed...
December 4, 2017: Science of the Total Environment
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