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https://www.readbyqxmd.com/read/28646314/ozone-and-desiccation-tolerance-in-chlorolichens-are-intimately-connected-a-case-study-based-on-two-species-with-different-ecology
#1
Stefano Bertuzzi, Elisa Pellegrini, Fabio Candotto Carniel, Guido Incerti, Giacomo Lorenzini, Cristina Nali, Mauro Tretiach
Tropospheric ozone (O3) causes severe damage to many vascular plants but not to lichens. It was recently suggested that this may be due to their high levels of natural defences against the oxidative bursts associated to their fluctuating water content. In this study, the combined effects of watering regime (with or without a daily spray of distilled water), air relative humidity (20 ± 5 vs. 80 ± 5% RH) and O3 (250 vs. 0 ppb, 5 h day(-1) for 2 weeks) were monitored in two chlorolichens with different ecology, Parmotrema perlatum and Xanthoria parietina...
June 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28645642/ngs-and-blood-group-systems-state-of-the-art-and-perspectives
#2
Y Fichou, C Férec
Molecular analysis, or genotyping, of genes involved in the expression of blood group antigens has been a standard strategy used in immunohaematology laboratories routinely. For the past ten years, next-generation sequencing (NGS), or second-generation sequencing, has become the reference method in genetics. Extensive study of distinct targets, large genomic regions, and even whole genome is henceforth possible by this approach at minimal cost. Blood group genotyping has thus taken advantage of this technological advent...
June 20, 2017: Transfusion Clinique et Biologique: Journal de la Société Française de Transfusion Sanguine
https://www.readbyqxmd.com/read/28636359/relativistic-approximations-to-paramagnetic-nmr-chemical-shift-and-shielding-anisotropy-in-transition-metal-systems
#3
Syed Awais Rouf, Jiří Mareš, Juha Vaara
We apply approximate relativistic methods to calculate the magnetic property tensors, i.e., the g-tensor, zero-field splitting (ZFS) tensor (D), and hyperfine coupling (HFC) tensors, for the purpose of constructing paramagnetic nuclear magnetic resonance (pNMR) shielding tensors. The chemical shift and shielding anisotropy are calculated by applying a modern implementation of the classic Kurland-McGarvey theory (J. Magn. Reson. 1970, 2, 286), which formulates the shielding tensor in terms of the g- and HFC tensors obtained for the ground multiplet, in the case of higher than doublet multiplicity defined by the ZFS interaction...
June 21, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28615686/formation-and-electronic-properties-of-palladium-hydrides-and-palladium-rhodium-dihydride-alloys-under-pressure
#4
Xiao Yang, Huijian Li, Rajeev Ahuja, Taewon Kang, Wei Luo
We present the formation possibility for Pd-hydrides and Pd-Rh hydrides system by density functional theory (DFT) in high pressure upto 50 GPa. Calculation confirmed that PdH2 in face-centered cubic (fcc) structure is not stable under compression that will decomposition to fcc-PdH and H2. But it can be formed under high pressure while the palladium is involved in the reaction. We also indicate a probably reason why PdH2 can not be synthesised in experiment due to PdH is most favourite to be formed in Pd and H2 environment from ambient to higher pressure...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28609611/selective-aliphatic-carbon-carbon-bond-activation-by-rhodium-porphyrin-complexes
#5
Ching Tat To, Kin Shing Chan
The carbon-carbon bond activation of organic molecules with transition metal complexes is an attractive transformation. These reactions form transition metal-carbon bonded intermediates, which contribute to fundamental understanding in organometallic chemistry. Alternatively, the metal-carbon bond in these intermediates can be further functionalized to construct new carbon-(hetero)atom bonds. This methodology promotes the concept that the carbon-carbon bond acts as a functional group, although carbon-carbon bonds are kinetically inert...
June 13, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28606033/tc-99m-radiolabeled-alendronate-sodium-microemulsion-characterization-and-permeability-studies-across-caco-2-cells
#6
Yetkin Elitez, Meliha Ekinci, Derya Ilem-Ozdemir, Evren Gundogdu, Makbule Asikoglu
BACKGROUND: Alendronate sodium (ALD) is used orally but it is poorly absorbed from the gastrointestinal (GI) tract. For this reason, microemulsion system was chosen to evaluate ALD from the GI tract after oral delivery. OBJECTIVE: This study was aimed to prepare water-in-oil (w/o) microemulsion formulation of ALD and evaluate the permeability of ALD microemulsion from Caco-2 cell lines with radioactive and non-radioactive studies. METHOD: The ALD microemulsion was developed by using pseudo-ternary phase diagram and composed of Soybean oil, Colliphor EL, Tween 80, Transcutol and distilled water...
June 12, 2017: Current Drug Delivery
https://www.readbyqxmd.com/read/28602869/solid-state-properties-and-drug-release-behavior-of-co-amorphous-indomethacin-arginine-tablets-coated-with-kollicoat%C3%A2-protect
#7
Ina Petry, Korbinian Löbmann, Holger Grohganz, Thomas Rades, Claudia S Leopold
A promising approach to improve the solubility of poorly water-soluble drugs and to overcome the stability issues related to the plain amorphous form of the drugs, is the formulation of drugs as co-amorphous systems. Although polymer coatings have been proven very useful with regard to tablet stability and modifying drug release, there is little known on coating co-amorphous formulations. Hence, the aim of the present study was to investigate whether polymer coating of co-amorphous formulations is possible without inducing recrystallization...
June 8, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28596661/what-is-it-really-anti-g-or-anti-d-plus-anti-c-clinical-significance-in-antenatal-mothers
#8
Soumya Das, Shamee Shastry, M Murugesan, Poornima Baliga B, Shamee Shastry
G antigen of Rh blood group system is present either along with D and/or C positive red cells. Hence, [serologically anti-G presents with the similar picture as that of multiple antibodies (anti-D + anti-C). Differentiating them is important as anti-D + anti-C causes severe hemolytic disease of the fetus and newborn than anti-G. In pregnancies with anti-G alone, alloimmunization due to D antigen could be prevented by prophylactic administration of RhIg. Differentiating between anti-D + C from anti-G in alloimmunized pregnant mothers becomes essential...
June 2017: Indian Journal of Hematology & Blood Transfusion
https://www.readbyqxmd.com/read/28591563/evaluation-of-the-cytotoxicity-and-intestinal-absorption-of-a-self-emulsifying-drug-delivery-system-containing-sodium-taurocholate
#9
Hang Gao, Miao Wang, Dandan Sun, Shilin Sun, Cheng Sun, Jianguo Liu, Qingxiang Guan
Currently, many surfactants used in self-emulsifying drug delivery systems (SMEDDS) can cause gastrointestinal mucosal irritation and systemic toxicity. In the present study, SMEDDS were loaded with pueraria flavones, using sodium taurocholate to replace polyoxyl 40 dydrogenated castor oil (Cremophor® RH 40) as the surfactant (PF-SMEDDSNR) to reduce the toxicity of SMEDDS using Cremophor® RH 40 as the surfactant (PF-SMEDDSR). The absorption rate constants (Ka) and intestinal permeability coefficients (Peff) were measured...
June 4, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28590712/structural-characterization-of-intermetallic-compounds-by-27-al-solid-state-nmr-spectroscopy
#10
Christopher Benndorf, Hellmut Eckert, Oliver Janka
Intermetallic compounds are of broad interest for solid state chemists, condensed matter physicists, and material scientists due to their intriguing crystal chemistry, their physical properties, and their potential applications, ranging from lab curiosities to everyday objects. To characterize and understand the properties of new compounds and novel materials, the availability of structural information, particularly single-crystal X-ray diffraction data, is a mandatory prerequisite. Especially when it comes to the formation of compounds with deficient or mixed site occupancies, superstructures, or representatives crystallizing in other, thus far unknown structure types, a complementary method for structural analysis is of great value...
June 7, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28584838/evaluating-combined-effect-of-noise-and-heat-on-blood-pressure-changes-among-males-in-climatic-chamber
#11
Habibollah Dehghan, Mohamad Taghi Bastami, Behzad Mahaki
INTRODUCTION: Exposure to noise and heat causes individuals to experience some changes in the function of cardiovascular system in workplaces. This study aimed to find the combined effect of heat and noise on systolic and diastolic types of blood pressure in experimentally controlled conditions. METHODS: This quasi-experimental study was performed with 12 male students in a climatic chamber in 2014. Blood pressure including systolic and diastolic was measured in the following conditions: 15 min after rest in exposure to heat (40°C, relative humidity [RH]: 30%), exposure to noise with 75, 85, and 95 dB rates in thermal comfort condition (22...
2017: Journal of Education and Health Promotion
https://www.readbyqxmd.com/read/28583333/dry-powder-formulation-of-kanamycin-with-enhanced-aerosolization-efficiency-for-drug-resistant-tuberculosis
#12
Mohammad A M Momin, Shubhra Sinha, Ian G Tucker, Colin Doyle, Shyamal C Das
BACKGROUND: Kanamycin, an injectable agent, is currently used to treat drug-resistant tuberculosis (TB). Parenteral kanamycin causes high systemic toxicity which could be avoided by direct delivery to the lungs. This study focused on producing a highly aerosolizable dry-powder of hygroscopic kanamycin by spray-drying with l-leucine. METHODS: Kanamycin powders were prepared with different concentrations (0, 5, 10, 15 and 20% w/w) of l-leucine using the Buchi B-290 Mini Spray-Dryer...
June 3, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28576386/-identification-of-alloantibodies-and-their-associations-balance-sheet-of-3%C3%A2-years-at-the-regional-center-of-blood-transfusion-in-rabat-morocco-and-difficult-in-transfusion-management
#13
S Achargui, A Zidouh, S Abirou, F Z Merhfour, S Monsif, S Amahrouch, A El Ghobre, M El Halhali, H Temmara, A El Hryfy, M Motqi, A Satty, M Kandili, M Aghri, K Hajjout, M Benajiba
Red blood cell immunization can lead to delays or even an impasse in a transfusion. OBJECTIVES: Determine the specificities of the most common of alloantibodies and their associations to correct management of red blood cell transfused. METHODS AND MATERIALS: A retrospective study between 2013 and 2015 in immunohematology laboratories at the Blood Transfusion Center of Rabat in Morocco. The following data were studied: frequency, specificities of alloantibodies, blood group involved in alloimmunization and difficult of management of transfusion in case with association of alloantibodies...
May 30, 2017: Transfusion Clinique et Biologique: Journal de la Société Française de Transfusion Sanguine
https://www.readbyqxmd.com/read/28576096/an-initial-boundary-value-problem-for-the-integrable-spin-1-gross-pitaevskii-equations-with-a-4-%C3%A3-4-lax-pair-on-the-half-line
#14
Zhenya Yan
We extend the idea of the Fokas unified transform to investigate the initial-boundary value problem for the integrable spin-1 Gross-Pitaevskii equations with a 4 × 4 Lax pair on the half-line. The solution of this system can be expressed in terms of the solution of a 4 × 4 matrix Riemann-Hilbert (RH) problem formulated in the complex k-plane. The relevant jump matrices of the RH problem can be explicitly found using the two spectral functions s(k) and S(k), which can be defined by the initial data, the Dirichlet-Neumann boundary data at x = 0...
May 2017: Chaos
https://www.readbyqxmd.com/read/28566644/creation-of-novel-cyclization-methods-using-sp-hybridized-carbon-units-and-syntheses-of-bioactive-compounds
#15
Chisato Mukai
Some recent results on the development of new and reliable procedures for the construction of diverse ring systems based on the chemistry of sp-hybridized species, especially allene functionality, are described. This review includes: (i) synthesis of the multi-cyclic skeletons by combination of the π-component of allene with suitable other π-components such as alkyne, alkene, or additional allene under Rh-catalyzed conditions; (ii) synthesis of heterocycles as well as carbocycles by reaction of the sp-hybridized center of allene with some nucleophiles in an endo-mode manner; and (iii) total syntheses of natural products and related compounds from the sp-hybridized starting materials...
2017: Chemical & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28561096/enhancements-in-catalytic-reactivity-and-selectivity-of-homobimetallic-complexes-containing-heteroditopic-ligands
#16
Mark R D Gatus, Roy T McBurney, Mohan Bhadbhade, Barbara A Messerle
Rh(i) and Ir(i) homobimetallic complexes were synthesised using a heteroditopic ligand system on a xanthene scaffold containing a monodentate N-heterocyclic carbene ligand and a bidentate bis(pyrazol-1-yl)methane ligand. The complexes were tested as catalysts for the two-step dihydroalkoxylation and two-step hydroamination/hydrosilylation reactions. This is the first known report of an organometallic group 9 complex, Ir(i) bimetallic complex, 13, to selectively favour the opposite spirocyclisation product from that reported in the literature, 14cvs...
June 13, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28554698/effects-of-carotid-baroreceptor-stimulation-on-retinal-arteriole-remodeling-evaluated-with-adaptive-optics-camera-in-resistant-hypertensive-patients
#17
A Gallo, D Rosenbaum, C Kanagasabapathy, X Girerd
BACKGROUND AND AIM: Baroreceptor activation therapy (BAT) leads to a decrease in blood pressure (BP) in patients affected by resistant hypertension (RH) by reducing sympathetic outflow. This study aimed at evaluating the effects of BAT on RH patients' retinal arteriolar microvasculature, a territory devoid of adrenergic innervation. PATIENTS AND METHODS: Five patients defined as affected by RH after excluding secondary causes of hypertension and based on number of antihypertensive treatments, underwent the implantation of Barostim™ neo™...
May 26, 2017: Annales de Cardiologie et D'angéiologie
https://www.readbyqxmd.com/read/28548280/air-core-detectors-for-cerenkov-free-scintillation-dosimetry-of-brachytherapy-%C3%AE-sources
#18
Marion Eichmann, Benedikt Thomann
PURPOSE: Plastic scintillation detectors are used for dosimetry in small radiation fields with high dose gradients, green e.g. provided by β-emitting sources like (106) Ru/(106) Rh eye plaques. A drawback is a background signal caused by Cerenkov radiation generated by electrons passing the optical fibers (light guides) of this dosimetry system. Common approaches to correct for the Cerenkov signal are influenced by uncertainties resulting from detector positioning and calibration procedures...
May 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/28546909/porous-ionic-membrane-based-flexible-humidity-sensor-and-its-multifunctional-applications
#19
Tie Li, Lianhui Li, Hongwei Sun, Yan Xu, Xuewen Wang, Hui Luo, Zheng Liu, Ting Zhang
A highly flexible porous ionic membrane (PIM) is fabricated from a polyvinyl alcohol/KOH polymer gel electrolyte, showing well-defined 3D porous structure. The conductance of the PIM changes more than 70 times as the relative humidity (RH) increases from 10.89% to 81.75% with fast and reversible response at room temperature. In addition, the PIM-based sensor is insensitive to temperature (0-95 °C) and pressure (0-6.8 kPa) change, which indicates that it can be used as highly selective flexible humidity sensor...
May 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28546898/treatment-of-fly-ash-from-power-plants-using-thermal-plasma
#20
Sulaiman Al-Mayman, Ibrahim AlShunaifi, Abdullah Albeladi, Imed Ghiloufi, Saud Binjuwair
Fly ash from power plants is very toxic because it contains heavy metals. In this study fly ash was treated with a thermal plasma. Before their treatment, the fly ash was analyzed by many technics such as X-ray fluorescence, CHN elemental analysis, inductively coupled plasma atomic emission spectroscopy and scanning electron microscopy. With these technics, the composition, the chemical and physical proprieties of fly ash are determined. The results obtained by these analysis show that fly ash is mainly composed of carbon, and it contains also sulfur and metals such as V, Ca, Mg, Na, Fe, Ni, and Rh...
2017: Beilstein Journal of Nanotechnology
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