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https://www.readbyqxmd.com/read/27907863/dimerization-redox-properties-and-antioxidant-activity-of-two-manganese-iii-complexes-of-difluoro-and-dichloro-substituted-schiff-base-ligands
#1
Claudia Palopoli, Guillermo Gómez, Ana Foi, Fabio Doctorovich, Sonia Mallet-Ladeira, Christelle Hureau, Sandra Signorella
Two mononuclear Mn(III) complexes [Mn(3,5-F2salpn)(H2O)2][B(C6H5)4]·2H2O (1·2H2O) and [Mn(3,5-Cl2salpn)(OAc)(H2O)]·H2O (2·H2O), where H2salpn=1,3-bis(salicylidenamino)propane, have been prepared and characterized. The crystal structure of 1·H2O shows that this complex forms μ-aqua dimers with a short Mn⋯Mn distance of 4.93Å. Under anaerobic conditions, the two complexes are stable in solution and possess trans-diaxial symmetry with the tetradentate Schiff base ligand symmetrically arranged in the equatorial plane...
November 18, 2016: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/27873259/sample-preparation-for-mass-spectrometry-based-absolute-protein-quantification-in-antibiotic-stress-research
#2
Florian Bonn, Sandra Maass, Dörte Becher
Absolute protein quantification is an essential tool for system biology approaches and elucidation of stoichiometry of multi-protein complexes. In this chapter, a universal protocol for gel free absolute protein quantification in bacterial systems is described, which can be used for sample preparation prior to miscellaneous mass-spectrometry-based quantification workflows like AQUA, Hi3, and emPAI. In addition, a focus has been set to the specific challenges in antibiotic stress research.
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27863868/establishing-geochemical-background-variation-and-threshold-values-for-59-elements-in-australian-surface-soil
#3
Clemens Reimann, Patrice de Caritat
During the National Geochemical Survey of Australia over 1300 top (0-10cm depth) and bottom (~60-80cm depth) sediment samples (including ~10% field duplicates) were collected from the outlet of 1186 catchments covering 81% of the continent at an average sample density of 1 site/5200km(2). The <2mm fraction of these samples was analysed for 59 elements by ICP-MS following an aqua regia digestion. Results are used here to establish the geochemical background variation of these elements, including potentially toxic elements (PTEs), in Australian surface soil...
November 15, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27847990/biological-and-chemical-factors-driving-the-temporal-distribution-of-cyanobacteria-and-heterotrophic-bacteria-in-a-eutrophic-lake-west-lake-china
#4
Hao Song, Jiahui Xu, Michel Lavoie, Xiaoji Fan, Guangfu Liu, Liwei Sun, Zhengwei Fu, Haifeng Qian
Physico-chemical parameters, hydrological conditions, and microbial interactions can affect the growth and persistence of cyanobacteria, but the interacting effects among these bloom-forming factors are still poorly known. This hampers our capacity to predict the occurrence of cyanobacterial bloom accurately. Here, we studied the relationship between temperature, N and P cycles, and the microbial community abundance and diversity at 0.5 m under the surface of West Lake (China) from January 21 to November 20, 2015, in order to better understand the key factors regulating temporal changes in the cyanobacterial community...
November 15, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27844242/relationship-between-heavy-metals-and-minerals-extracted-from-soil-clay-by-standard-and-novel-acid-extraction-procedures
#5
Vander Freitas Melo, Araína Hulmann Batista, Robert J Gilkes, Andrew W Rate
Strong acid digestions are commonly used to determine heavy metal (HM) contents in soils. In order to understand more fully the acid digestion processes, a logical step is to determine the extent of dissolution of mineral phases. The aims of this study were to compare the efficiency of extraction of HM by different acid digestions and to monitor the associated dissolution of the clay fraction. The context of the study was to develop a milder chemical extraction method (microwave-assisted 1 mol L(-1) HNO3 closed system (NACS)), which recovers more reactive HM and with little dissolution of minerals...
December 0: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27837363/remote-sensing-of-bacterial-response-to-degrading-phytoplankton-in-the-arabian-sea
#6
P Priyaja, R Dwivedi, S Sini, M Hatha, N Saravanane, M Sudhakar
A remote sensing technique has been developed to detect physiological condition of phytoplankton using in situ and moderate imaging spectroradiometer (MODIS)-Aqua data. The recurring massive mixed algal bloom of diatom and Noctiluca scintillans in the Northern Arabian Sea during winter-spring was used as test bed to study formation, growth and degradation of phytoplankton. The ratio of chlorophyll (chl) to particulate organic carbon (POC) was considered as an indicator of phytoplankton physiological condition and used for the approach development...
December 0: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27836721/the-european-seabass-dicentrarchus-labrax-innate-immunity-and-gut-health-are-modulated-by-dietary-plant-protein-inclusion-and-prebiotic-supplementation
#7
Rita Azeredo, Marina Machado, Eva Kreuz, Sven Wuertz, Aires Oliva-Teles, Paula Enes, Benjamín Costas
Inclusion of prebiotics in aqua feeds, though a costly strategy, has increased as a means to improve growth. Still, its effects on health improvement are not fully disclosed. Regarding their immunestimulatory properties, research has focused on carbohydrates such as fructooligosaccharides and xylooligosaccharides demonstrating their modulatory effects on immune defences in higher vertebrates but few studies have been done on their impact on fish immunity. Replacing fish meal (FM) by plant protein (PP) sources is a current practice in the aquaculture business but their content in antinutrients is still a drawback in terms of gut well-functioning...
November 9, 2016: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/27828553/simulations-of-the-water-exchange-dynamics-of-lanthanide-ions-in-1-ethyl-3-methylimidazolium-ethyl-sulfate-emim-etso4-and-water
#8
Yi-Jung Tu, Matthew J Allen, G Andrés Cisneros
The dynamics of ligand exchange on lanthanide ions is important for catalysis and organic reactions. Recent (17)O-NMR experiments have shown that water-exchange rates of lanthanide ions in water/1-ethyl-3-methylimidazolium ethyl sulfate (water/[EMIm][EtSO4]) increase as a function of increasing charge density. The trend of water-exchange rates in this solvent is opposite to that observed in water. Since the lanthanide ions and ionic liquids investigated in that work were highly charged, an advanced polarizable potential is desirable for accurate simulations...
November 9, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27815978/copper-ii-complexes-possessing-alkyl-substituted-polypyridyl-ligands-structural-characterization-and-in-vitro-antitumor-activity
#9
Noah R Angel, Raneen M Khatib, Julia Jenkins, Michelle Smith, Justin M Rubalcava, Brian Khoa Le, Daniel Lussier, Zhuo Georgia Chen, Fook S Tham, Emma H Wilson, Jack F Eichler
In an effort to find alternatives to the antitumor drug cisplatin, a series of copper (II) complexes possessing alkyl-substituted polypyridyl ligands have been synthesized. Eight new complexes are reported herein: μ-dichloro-bis{2,9-di-sec-butyl-1,10-phenanthrolinechlorocopper(II)} {[((di-sec-butyl)phen)ClCu(μ-Cl)2CuCl((di-sec-butyl)phen)]}(1), 2-sec-butyl-1,10-phenanthrolinedichlorocopper(II) {([mono-sec-butyl)phen) CuCl2} (2), 2,9-di-n-butyl-1,10-phenanthrolinedichlorocopper(II) {[(di-n-butyl)phen) CuCl2}(3), 2-n-butyl-1,10-phenanthrolinedichlorocopper(II) {[(mono-n-butyl)phen) CuCl2} (4), 2,9-di-methyl-1,10-phenanthrolineaquadichlorocopper(II) {[(di-methyl)phen) Cu(H2O)Cl2}(5), μ-dichloro-bis{6-sec-butyl-2,2'-bipyridinedichlorocopper(II)} {((mono-sec-butyl)bipy) ClCu(μ-Cl)2CuCl((mono-sec-butyl)bipy)} (6), 6,6'-di-methyl-2,2'-bipyridinedichlorocopper(II) {(6,6'-di-methyl)bipy) CuCl2} (7), and 4,4'-dimethyl-2,2'-bipyridinedichlorocopper(II) {(4,4'-di-methyl)bipy) CuCl2} (8)...
October 22, 2016: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/27814539/study-on-formation-of-2-4-6-trichloroanisole-by-microbial-o-methylation-of-2-4-6-trichlorophenol-in-lake-water
#10
Kejia Zhang, Zhang Luo, Tuqiao Zhang, Minmin Mao, Jie Fu
To explore the mechanisms and influence factors on the production of 2,4,6-trichloroanisole (2,4,6-TCA) in surface waters, the 2,4,6-TCA formation potential (FP) test was conducted by incubating the real lake water with the addition of 2,4,6-trichlorophenol (2,4,6-TCP) precursor. Besides bacteria and fungi, two common cyanobacteria and algae species, i.e., Chlorella vulgaris and Anabaena flos-aquae, have been proved to have strong capabilities to produce 2,4,6-TCA, which may contribute the high 2,4,6-TCA FP (152...
October 28, 2016: Environmental Pollution
https://www.readbyqxmd.com/read/27801507/development-of-the-anatomical-quality-assurance-aqua-checklist-guidelines-for-reporting-original-anatomical-studies
#11
Krzysztof A Tomaszewski, Brandon Michael Henry, Piravin Kumar Ramakrishnan, Joyeeta Roy, Jens Vikse, Marios Loukas, R Shane Tubbs, Jerzy A Walocha
BACKGROUND: The rise of evidence-based anatomy (EBA) has emphasized the need for original anatomical studies with high clarity, transparency, and comprehensiveness in reporting. Currently, inconsistencies in the quality and reporting of such studies have placed limits on accurate reliability and impact assessment. Our aim was to develop a checklist of reporting items that should be addressed by authors of original anatomical studies. MATERIALS AND METHODS: The study steering committee formulated a preliminary conceptual design and began to generate items on the basis of a literature review and expert opinion...
November 1, 2016: Clinical Anatomy
https://www.readbyqxmd.com/read/27793060/rhinitis-in-elite-and-non-elite-field-hockey-players
#12
A Walker, P Surda, M Rossiter, S Little
Rhinitis has been demonstrated to impose a significant disease burden upon the general population. We sought to determine the prevalence of rhinitis in athletes; to investigate its relationship with co-existing allergic symptoms; and to quantify the impact of rhinitis on quality of life in the athlete.3 subgroups were studied: elite field hockey players (FHP); non-elite FHP; and a sedentary control group.Participants were asked to complete a rhinitis self-report questionnaire; the "Allergic Questionnaire for Athletes" (AQUA), and quality of life Sinonasal Outcome Test - 22 (SNOT-22)...
October 28, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27783071/synthesis-structural-characterization-and-catalysis-of-ruthenium-ii-complexes-based-on-2-5-bis-2-pyridyl-pyrrole-ligand
#13
Yi-Qing Zhong, Hui-Qiong Xiao, Xiao-Yi Yi
Treatment of the 2,5-bis(2'-pyridyl)pyrrolato (PDP(-)) anion with {Ru(COD)Cl2}n in THF readily yielded [Ru(PDP)(COD)Cl] (1) in almost quantitative yield. Anion metathesis of 1 in organic solvent by NO3(-) and OTf(-) (OTf(-) = triflato) gave [Ru(PDP)(COD)(NO3)] (2) and [Ru(PDP)(COD)(OTf)] (3), and in aqueous solution by BF4(-) and PF6(-) afforded aqueous complexes [Ru(PDP)(COD)(H2O)](BF4) (4+·BF4(-)) and [Ru(PDP)(COD)(H2O)](PF6) (4+·PF6(-)), respectively. Treatment of 1 with PhICl2 in CH2Cl2 afforded 5 with halogenated pyrrole...
October 26, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27777840/mechanistic-investigation-into-olefin-epoxidation-with-h2o2-catalyzed-by-aqua-coordinated-sandwich-type-polyoxometalates-role-of-the-noble-metal-and-active-oxygen-position
#14
Chenggang Ci, Hongsheng Liu, Likai Yan, Zhongmin Su
Aqua-coordinated sandwich-type polyoxometalates (POMs), {[WZnTM2(H2O)2](ZnW9O34)2} (n-) (TM=Rh(III), Pd(II), and Pt(II)), catalyze olefin epoxidation with hydrogen peroxide and have been well established, and they present an advance toward the utilization of olefins. To elucidate the epoxidation mechanism, we systematically performed density functional calculations. The reaction proceeds through a two-step mechanism: activation of H2O2 and oxygen transfer. The aqua-coordinated complexes show two distinct H2O2 activation pathways: "two-step" and "concerted"...
October 2016: ChemistryOpen
https://www.readbyqxmd.com/read/27768615/daily-wear-contact-lenses-manufactured-in-etafilcon-a-are-noninferior-to-two-silicone-hydrogel-lens-types-with-respect-to-hypoxic-stress
#15
Loretta B Szczotka-Flynn, Sara Debanne, Beth Ann Benetz, Tawnya Wilson, Noel Brennan
PURPOSE: This study hypothesized that a traditional high-water contact lens of moderate oxygen transmissibility (Dk/t) is noninferior to common silicone hydrogel (SH) lenses worn for daily wear with respect to measures of hypoxic stress. METHODS: Thirty-six habitual contact lens wearers completed wear of three lens types worn in a randomized order: etafilcon A (ACUVUE 2, control), lotrafilcon B (Air Optix Aqua), and comfilcon A (Biofinity). Central corneal thickness (CT) and limbal hyperemia were measured >2 hr after waking and after 6 to 8 hr of wear on days 1 and 7...
October 20, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27767178/platinum-recycling-going-green-via-induced-surface-potential-alteration-enabling-fast-and-efficient-dissolution
#16
Nejc Hodnik, Claudio Baldizzone, George Polymeros, Simon Geiger, Jan-Philipp Grote, Serhiy Cherevko, Andrea Mingers, Aleksandar Zeradjanin, Karl J J Mayrhofer
The recycling of precious metals, for example, platinum, is an essential aspect of sustainability for the modern industry and energy sectors. However, due to its resistance to corrosion, platinum-leaching techniques rely on high reagent consumption and hazardous processes, for example, boiling aqua regia; a mixture of concentrated nitric and hydrochloric acid. Here we demonstrate that complete dissolution of metallic platinum can be achieved by induced surface potential alteration, an 'electrode-less' process utilizing alternatively oxidative and reductive gases...
October 21, 2016: Nature Communications
https://www.readbyqxmd.com/read/27746948/crystal-structure-of-di-aqua-bis-2-chloro-pyridine-%C3%AE%C2%BAn-bis-thio-cyanato-%C3%AE%C2%BAn-nickel-ii
#17
Stefan Suckert, Inke Jess, Christian Näther
The asymmetric unit of the title compound, [Ni(NCS)2(C5H4ClN)2(H2O)2], consists of one nickel(II) cation that is located on a center of inversion and one thio-cyanate anion, one water mol-ecule and one 2-chloro-pyridine ligand all occupying general positions. The Ni(II) cation is octa-hedrally coordinated by two terminal N-bound thio-cyanato ligands, two aqua ligands and two N-bound 2-chloro-pyridine ligands into discrete complexes. Individual complexes are linked by inter-molecular O-H⋯S and O-H⋯Cl hydrogen-bonding inter-actions into a layered network extending parallel to the bc plane...
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/27746937/glycine-zinc-sulfate-penta-hydrate-redetermination-at-10%C3%A2-k-from-time-of-flight-neutron-laue-diffraction
#18
A Dominic Fortes, Christopher M Howard, Ian G Wood, Matthias J Gutmann
Single crystals of glycine zinc sulfate penta-hydrate [systematic name: hexa-aqua-zinc tetra-aquadiglycinezinc bis-(sulfate)], [Zn(H2O)6][Zn(C2H5NO2)2(H2O)4](SO4)2, have been grown by isothermal evaporation from aqueous solution at room temperature and characterized by single-crystal neutron diffraction. The unit cell contains two unique ZnO6 octa-hedra on sites of symmetry -1 and two SO4 tetra-hedra with site symmetry 1; the octa-hedra comprise one [tetra-aqua-diglycine zinc](2+) ion (centred on one Zn atom) and one [hexa-aqua-zinc](2+) ion (centred on the other Zn atom); the glycine zwitterion, NH3(+)CH2COO(-), adopts a monodentate coordination to the first Zn atom...
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/27746931/isotypic-mn-ii-and-fe-ii-binuclear-complexes-of-the-ligand-5-6-bis-pyridin-2-yl-pyrazine-2-3-di-carb-oxy-lic-acid
#19
Monserrat Alfonso, Helen Stoeckli-Evans
The title isotypic complexes, bis-[μ-5,6-bis-(pyridin-2-yl)pyrazine-2,3-di-carboxylato]-κ(4)N(1),O(2),N(6):O(3);κ(4)O(3):N(1),O(2),N(6)-bis-[di-aqua-manganese(II)] tetra-hydrate, [Mn2(C16H8N4O4)2(H2O)4]·4H2O, (I), and bis-[μ-5,6-bis-(pyridin-2-yl)pyrazine-2,3-di-carboxyl-ato]-κ(4)N(1),O(2),N(6):O(3);κ(4)O(3):N(1),O(2),N(6)-bis-[di-aqua-iron(II)] tetrahydrate, [Fe2(C16H8N4O4)2(H2O)4]·4H2O, (II), are, respectively, the mangan-ese(II) and iron(II) complexes of the ligand 5,6-bis-(pyridin-2-yl)-pyrazine-2,3-di-carb-oxy-lic acid...
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/27746921/crystal-structure-of-trans-di-aqua-bis-4-cyano-benzoato-%C3%AE%C2%BAo-bis-n-n-di-ethyl-nicotinamide-%C3%AE%C2%BAn-zinc-ii
#20
Nurcan Akduran, Hacali Necefoğlu, Ömer Aydoğdu, Tuncer Hökelek
In the title complex, [Zn(C8H4NO2)2(C10H14N2O)2(H2O)2], the Zn(II) cation, located on an inversion centre, is coordinated by two water mol-ecules, two 4-cyano-benzoate (CB) anions and two di-ethyl-nicotinamide (DENA) ligands in a distorted N2O4 octa-hedral geometry. In the mol-ecule, the dihedral angle between the planar carboxyl-ate group and the adjacent benzene ring is 9.50 (14)°, while the benzene and pyridine rings are oriented at a dihedral angle of 56.99 (5)°. The water mol-ecules exhibit both an intra-molecular hydrogen bond [to the non-coordinating carboxyl-ate O atom, enclosing an S(6) hydrogen-bonding motif, where O⋯O = 2...
October 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
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