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Rh system

Martin Konečný, Miroslav Bartosik, Jindrich Mach, Vojtěch Švarc, David Nezval, Jakub Piastek, Pavel Procházka, Aleš Cahlík, Tomas Sikola
The article shows how the dynamic mapping of surface potential (SP) measured by Kelvin Probe Force Microscopy in combination with a calculation of diffusion-like equation and the theory based on the Brunauer-Emmett-Teller (BET) model of water condensation and electron hopping can provide the information concerning the resistivity of low conductive surfaces and their water coverage. This is enabled by a study of charge transport between isolated and grounded graphene sheets on a silicon dioxide surface at different relative humidity (RH) with regard to the use of graphene in ambient electronic circuits, and especially in sensors...
March 20, 2018: ACS Applied Materials & Interfaces
Ahmad Yaseen, Sa'd Suleiman, Omar Abu Zenah, Adham Abu Taha
BACKGROUND: Red blood-cell transfusion has greatly reduced the mortality and morbidity in multiply transfused patients with thalassaemia and sickle cell disease. However, this can result in red blood-cell isoimmunisation with autoantibodies and alloantibodies, which can lead to serious complications such as delayed haemolytic transfusion reaction. The aim of this study was to assess the frequency and types of alloantibodies in multiply transfused patients living in the north of the West Bank...
February 21, 2018: Lancet
John D Koerner, Dessislava Z Markova, Greg D Schroeder, Brian P Calio, Anuj Shah, Corbin W Brooks, Alexander R Vaccaro, D Greg Anderson, Chris K Kepler
BACKGROUND CONTEXT: The systemic response regarding cytokine expression after application of recombinant human Bone Morphogenetic Protein-2 (rhBMP-2) in a rat spinal fusion model has recently been defined1 , but the local response has not. Defining the local cytokine and growth factor response at the fusion site will help explain the roles of these molecules in the fusion process, as well as that of rhBMP-2. Our hypothesis is that application of rhBMP-2 to the fusion site will alter the local levels of cytokines and growth factors throughout the fusion process, in a manner that is different than the systemic response given the tissue-specific effects of rhBMP-2...
March 14, 2018: Spine Journal: Official Journal of the North American Spine Society
Yanfang Liu, Qingjiu Tang, Jingsong Zhang, Yongmei Xia, Yan Yang, Di Wu, Steve W Cui
β-D-glucan (GLP20) isolated from Ganoderma lucidum fruiting bodies was successfully fractionated into five fractions with different weight-average molecular weights (Mw ) through ultrasonic irradiation. The Mw , radius of gyration (Rg ), hydrodynamic radius (Rh ) and intrinsic viscosity ([η]) of these fractions in phosphate buffered saline (PBS) aqueous solution were determined using HPSEC-MALLS-RI-VS system. The results indicated that β-D-glucan displayed rigid chain conformations with ρ values lager than 2...
March 13, 2018: International Journal of Biological Macromolecules
Chun-Yu Wang, Shuai Jiang, Yi-Rong Liu, Hui Wen, Zhongquan Wang, Ya-Juan Han, Teng Huang, Wei Huang
Ammonia and amines are important common trace atmospheric species that can enhance new particle formation (NPF) in the Earth's atmosphere. However, the synergistic effect of these two bases involving nucleation is still lacking. We studied the most stable geometric structures and thermodynamics of quaternary (NH3)(CH3NH2)(H2SO4)m(H2O)n (m = 1-3, n = 0-4) clusters at the PW91PW91/6-311++G(3df,3pd) level of theory for the first time. We find that the proton transfer from H2SO4 molecule to CH3NH2 molecule is easier than to NH3 molecule in the free or hydrated H2SO4-base clusters, and thus leads to the stability...
March 16, 2018: Journal of Physical Chemistry. A
Taemoon Song, Ji Eun Park, Young Keun Chung
[Rh(COD)Cl]2/xantphos/Cs2CO3 efficiently catalyzes the reductive N-alkylation of aryl nitro compounds with alcohols by a borrowing-hydrogen strategy to afford the corresponding imine products in good to excellent yield. In the absence of xantphos, the [Rh(COD)Cl]2/Cs2CO3 catalytic system behaves as an effective catalyst for the dehydrogenative cou-pling of alcohols to esters, with nitrobenzene as hydrogen-acceptor. The reactivity of the rhodium catalytic system can be easily manipulated to selectively afford the imine or ester...
March 14, 2018: Journal of Organic Chemistry
Ricardo Dos Reis, Carlos E M C Andrade, Michael Frumovitz, Mark Munsell, Pedro T Ramirez
STUDY OBJECTIVE: The goal of our study is to compare outcomes of radical hysterectomy (RH) across age groups based on surgical approach. DESIGN: Cross-sectional study. CANADIAN TASK FORCE CLASSIFICATION: II-2 SETTING: Department of Gynecologic Oncology and Reproductive Medicine, The University of Texas MD Anderson Cancer Center. PATIENTS: We retrospectively reviewed patients with early-stage cervical cancer who underwent RH at a tertiary cancer center from 1990 to 2013...
March 9, 2018: Journal of Minimally Invasive Gynecology
Ignacio Funes-Ardoiz, Feliu Maseras
DFT calculations are applied to the study of the oxidative coupling between benzoic acid and 1-phenyl-1-propyne catalyzed by [CpRhCl2]2 using either Cu(OAc)2(H2O) or Ag(OAc) as terminal oxidants, a process that has been experimentally shown to have subtleties related to regioselectivity (placement of the phenyl substituent of the alkyne in the isocoumarin product) and chemoselectivity (isocoumarin or naphthalene derivatives). Calculations reproduce the experimental results, and show the involvement of the oxidant throughout the catalytic cycle...
March 12, 2018: Chemistry: a European Journal
Mingliang Li, Fuk Yee Kwong
A cobalt-catalyzed chelation-assisted tandem C-H activation/C-C cleavage/C-H cyclization of aromatic amides with alkylidenecyclopropanes (ACPs) is reported. This process allows the sequential formation of two C-C bonds, in which it is in sharp contrast to previous report of using Rh catalyst for the formation of C-N bond. Here the inexpensive catalyst system exhibits good functional group compatibility and relatively broad substrate scope. The desired products can be easily transformed into polycyclic lactones with m-CPBA...
March 8, 2018: Angewandte Chemie
Khaled Alkhalifah, Ajit Brindhaban
OBJECTIVE: To investigate the effect of exposure factors used in digital screening mammography on images quality of different breast compositions. MATERIAL AND METHODS: A digital mammographic unit, with Tungsten (W) as target, Rhodium (Rh) and Silver (Ag) as filters and amorphous selenium (a-Se) detectors, was used to image Computerized Imaging Reference Systems (CIRS) Model 12A phantoms of thickness 4, 5 and 6 cm. Images of each phantom were obtained using target-filter combinations of W/Rh and W/Ag, at 28, 30, and 32 kVp...
March 7, 2018: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
Ying Zheng, Li Tang, Xiangmei Chen, Guangyan Cai, Wenge Li, Zhaohui Ni, Wei Shi, Xiaoqiang Ding, Hongli Lin
BACKGROUND: Hypertension is prevalent in chronic kidney disease (CKD), but the control of hypertension is suboptimal. We reported the prevalence and characteristics of resistant and undertreated hypertension based on a nationwide survey aiming to improve blood pressure (BP) control. METHODS: Resistant hypertension (RH) was defined as BP above the target (<140/90 mm Hg) despite the use of 3 antihypertensive drugs or achieving the target BP by using ≥4 antihypertensive drugs...
March 6, 2018: Clinical and Experimental Hypertension: CHE
Amy Y Xu, Ebru Kizilay, Slawomir P Madro, Justin Z Vadenais, Kianan W McDonald, Paul L Dubin
"Self-suppression", the instability of complex coacervates at high concentration, is well-known for polycation-polyanion systems, but the transient nature of those complexes impedes development of a convincing model. The stable polyelectrolyte-micelle complexes of the polycation poly(diallyldimethylammonium chloride) (PDADMAC) with mixed micelles of sodium dodecyl sulfate (SDS)/Triton X-100 (TX100); and the stable complexes of PDADMAC with bovine serum albumin (BSA) can be characterized and identified as coacervate precursors...
March 5, 2018: Soft Matter
Fa-Cai Li, Qing Liu, Hany M Elsheikha, Wen-Bin Yang, Jun-Ling Hou, Xing-Quan Zhu
Toxoplasma gondii deploys many effector proteins in order to hijack and manipulate host cell signaling pathways, allowing parasite colonization, subversion of immune responses, and disease progression. T. gondii effector protein 14-3-3 (Tg14-3-3) promotes parasite dissemination inside the body, by enhancing the migratory ability of infected microglia and dendritic cells. Understanding both the mechanism of action and the host targets of Tg14-3-3 effector is important because of their importance to the parasite's virulence...
March 3, 2018: Parasitology Research
Xinxin Tang, Xiangqing Jia, Zheng Huang
Alkanes, the main constituents of petroleum, are attractive feedstocks for producing value-added chemicals. Linear aldehydes and amines are two of the most important building blocks in the chemical industry. To date, there have been no effective methods for directly converting n-alkanes to linear aldehydes and linear amines. Here, we report a molecular dual-catalyst system for production of linear aldehydes via regioselective carbonylation of n-alkanes. The system is comprised of a pincer iridium catalyst for transfer-dehydrogenation of the alkane using t-butylethylene or ethylene as a hydrogen acceptor working sequentially with a rhodium catalyst for olefin isomerization-hydroformylation with syngas...
March 2, 2018: Journal of the American Chemical Society
Takuya Fujimura, Tetsuya Shimada, Ryo Sasai, Shinsuke Takagi
A transparent hybrid film composed of cationic magnesium porphyrin and clay mineral was developed, and its chromic behavior depending on relative humidity (RH) was investigated. The hybrid film was obtained via intercalation of magnesium porphyrin into clay film; magnesium porphyrin was intercalated into the interlayer spaces of the clay mineral without aggregation. The absorption spectra of the hybrid film showed red shift compared to the aqueous solution of magnesium porphyrin because of the π-conjugated system extension with co-planarization of the meso-substituted pyridinium group and porphyrin ring...
February 27, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yann Fichou, Disha Parchure, Harita Gogri, Vidya Gopalkrishnan, Cédric Le Maréchal, Jian-Min Chen, Claude Férec, Manisha Madkaikar, Kanjaksha Ghosh, Swati Kulkarni
BACKGROUND: The Rh blood group system is the most polymorphic system and is implicated in hemolytic transfusion reaction and hemolytic disease of the fetus and newborn. Molecular genetics of the RH genes have been extensively studied in Caucasians, Africans, and East Asians and the variant alleles giving rise to weak and partial D phenotypes have been reported. However, limited genetic studies have been carried out in the large Indian population, even though the variability of Rh expression has been documented...
February 25, 2018: Transfusion
Jak Li, Keryn Lian
The effect of SiO2 additives on the conductivity and longevity of an alkaline tetraethylammonium hydroxide (TEAOH)-poly(acrylamide) (PAM) polymer electrolyte was investigated. Electrochemical impedance spectroscopy (EIS) and Raman microscopy studies were performed for TEAOH-PAM with micro-sized (mSiO2 ) or nano-sized (nSiO2 ) additives under highly hydrated and under ambient conditions. At a high relative humidity (RH) of 75%, nSiO2 significantly increased the ionic conductivity of OH- , achieving 25 mS cm-1 , while mSiO2 had little influence (10 mS cm-1 )...
February 26, 2018: Physical Chemistry Chemical Physics: PCCP
Jamshed Haneef, Renu Chadha, Vijay Gupta, Sanjay K Mandal
The present work highlights a novel polymorph (form II) of ambrisentan (AMT), a selective endothelin type A (ETA) receptor antagonist used in the treatment of pulmonary arterial hypertension (PAH). Form II was isolated by solution crystallization and characterised by differential scanning calorimetry, powder X-ray diffraction, solution calorimetry and aqueous solubility. The single crystal X-ray diffraction shows that it crystallizes in monoclinic system with space group P21/c different from the form I (commercial form)...
February 8, 2018: Journal of Pharmaceutical and Biomedical Analysis
Ling-Hsi Chen, Chiachung Chen
Humidity measurement is an important technique for the agricultural, foods, pharmaceuticals, and chemical industries. For the sake of convenience, electrical relative humidity (RH) sensors have been widely used. These sensors need to be calibrated to ensure their accuracy and the uncertainty measurement of these sensors has become a major concern. In this study, a self-made divided-flow generator was established to calibrate two types of electrical humidity sensors. The standard reference humidity was calculated from dew-point temperature and air dry-bulb temperature measured by a chilled mirror monitor...
February 21, 2018: Sensors
Behzad Darbasizadeh, Hamidreza Motasadizadeh, Behrouz Foroughi-Nia, Hassan Farhadnejad
The present study describes the fabrication of Tripolyphosphate (TPP)-crosslinked nanofibrous mats based on chitosan for use as a floating gastro-retentive delivery system. TPP-crosslinked chitosan (CH)/poly (ethylene oxide) (PEO)- ranitidine hydrochloride (RH) electrospun nanofibers (75.27 ± 2.10 nm) were prepared by electrospinning 70% v/v acetic acid solutions, and followed by crosslinking by TPP anions. The mechanical, structural and morphological properties of the prepared nanofibers were evaluated via tensile testing, XRD, FT-IR, TGA, NMR, AFM and SEM experimental techniques...
February 11, 2018: Journal of Pharmaceutical and Biomedical Analysis
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