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https://www.readbyqxmd.com/read/28239773/high-resolution-solid-state-nmr-spectroscopy-of-the-yersinia-pestis-outer-membrane-protein-ail-in-lipid-membranes
#1
Yong Yao, Samit Kumar Dutta, Sang Ho Park, Ratan Rai, L Miya Fujimoto, Andrey A Bobkov, Stanley J Opella, Francesca M Marassi
The outer membrane protein Ail (Adhesion invasion locus) is one of the most abundant proteins on the cell surface of Yersinia pestis during human infection. Its functions are expressed through interactions with a variety of human host proteins, and are essential for microbial virulence. Structures of Ail have been determined by X-ray diffraction and solution NMR spectroscopy, but those samples contained detergents that interfere with functionality, thus, precluding analysis of the structural basis for Ail's biological activity...
February 26, 2017: Journal of Biomolecular NMR
https://www.readbyqxmd.com/read/28239663/radiographic-indices-for-lumbar-developmental-spinal-stenosis
#2
Jason Pui Yin Cheung, Karen Ka Man Ng, Prudence Wing Hang Cheung, Dino Samartzis, Kenneth Man Chee Cheung
BACKGROUND: Patients with developmental spinal stenosis (DSS) are susceptible to developing symptomatic stenosis due to pre-existing narrowed spinal canals. DSS has been previously defined by MRI via the axial anteroposterior (AP) bony spinal canal diameter. However, MRI is hardly a cost-efficient tool for screening patients. X-rays are superior due to its availability and cost, but currently, there is no definition of DSS based on plain radiographs. Thus, the aim of this study is to develop radiographic indices for diagnosing DSS...
2017: Scoliosis and Spinal Disorders
https://www.readbyqxmd.com/read/28239563/synthesis-of-some-mg-co-al-type-nano-hydrotalcites-and-characterization
#3
Khadijeh Shekoohi, Fatemeh Sadat Hosseini, Amir Hossein Haghighi, Atefe Sahrayian
Hydrotalcites are quite prevalent in nature and their importance is growing more and more because of their very wide range of potential applications and uses. Because hydrotalcite does not exist in significant quantities in nature, coprecipitation methods are the most used for prepartion of hydrotalcite. In this study: Two types of Nano hydrotalcite compounds containing one divalent (Mg-Al) and two divalent cation(Co-Mg-Al) were synthesized based on aqueous solutions of corresponding nitrates by co-precipitation method...
2017: MethodsX
https://www.readbyqxmd.com/read/28239232/evidence-of-decoupling-between-arsenic-and-phosphate-in-shallow-groundwater-of-bangladesh-and-potential-implications
#4
Z Aziz, B C Bostick, Y Zheng, M R Huq, M M Rahman, K M Ahmed, A van Geen
Reductive dissolution of iron oxyhydroxides and reduction of arsenic are often invoked as leading causes of high dissolved As levels in shallow groundwater of Bangladesh. The second of these assumptions is questioned here by comparing the behavior As and phosphate (P), a structural analogue for As (V) which also adsorbs strongly to Fe oxyhydroxides but is not subject to reduction. The first line of evidence is provided by a detailed groundwater time-series spanning two years for three wells in the 6-9 m depth range showing removal of As(III) from shallow groundwater during the monsoon without of loss of P...
February 2017: Applied Geochemistry: Journal of the International Association of Geochemistry and Cosmochemistry
https://www.readbyqxmd.com/read/28239226/temperature-and-moisture-dependent-studies-on-alunogen-and-the-crystal-structure-of-meta-alunogen-determined-from-laboratory-powder-diffraction-data
#5
Volker Kahlenberg, Doris E Braun, Hannes Krüger, Daniela Schmidmair, Maria Orlova
Starting from a synthetic sample with composition Al2(SO4)3·16.6H2O, the high-temperature- and moisture-dependent behavior of alunogen has been unraveled by TGA measurements, in situ powder X-ray diffraction as well as by gravimetric moisture sorption/desorption studies. Heating experiments using the different techniques show that alunogen undergoes a first dehydration process already starting at temperatures slightly above 40 °C. The crystalline product of the temperature-induced dehydration corresponds to the synthetic equivalent of meta-alunogen and has the following chemical composition: Al2(SO4)3·13...
2017: Physics and Chemistry of Minerals
https://www.readbyqxmd.com/read/28239202/increased-zinc-accumulation-in-mineralized-osteosarcoma-tissue-measured-by-confocal-synchrotron-radiation-micro-x-ray-fluorescence-analysis
#6
Mirjam Rauwolf, Bernhard Pemmer, Andreas Roschger, Anna Turyanskaya, Stephan Smolek, Angelika Maderitsch, Peter Hischenhuber, Martin Foelser, Rolf Simon, Susanna Lang, Stephan E Puchner, Reinhard Windhager, Klaus Klaushofer, Peter Wobrauschek, Jochen G Hofstaetter, Paul Roschger, Christina Streli
Abnormal tissue levels of certain trace elements such as zinc (Zn) were reported in various types of cancer. Little is known about the role of Zn in osteosarcoma. Using confocal synchrotron radiation micro X-ray fluorescence analysis, we characterized the spatial distribution of Zn in high-grade sclerosing osteosarcoma of nine patients (four women/five men; seven knee/one humerus/one femur) following chemotherapy and wide surgical resection. Levels were compared with adjacent normal tissue. Quantitative backscattered electron imaging as well as histological examinations was also performed...
January 2017: X-Ray Spectrometry: XRS
https://www.readbyqxmd.com/read/28237872/solid-state-characterization-of-azelnidipine-oxalic-acid-co-crystal-and-co-amorphous-complexes-the-effect-of-different-azelnidipine-polymorphs
#7
Yahui Pan, Wenzhe Pang, Jie Lv, Jing Wang, Caiqin Yang, Wei Guo
In present study, based on the two polymorphs (α and β form) of azelnidipine (AZE), 12 complexes of AZE and oxalic acid (OXA) were prepared by solvent-assisted grinding (SG) and neat powder grinding (NG) methods at the AZE/OXA molar ratios of 2:1, 1:1, and 1:2. The effect of the different polymorphs of AZE on the micro-structure of the complexes were investigated by powder X-ray diffraction (PXRD), tempreture modulated differential scanning calorimetry and thermogravimetric analysis, cryo-field emission scanning electron microscope system, fourier transform infrared (FTIR), and solid-state nuclear magnetic resonance spectroscopy...
February 4, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28237687/a-new-approach-to-improve-the-local-compressive-properties-of-ppdo-self-expandable-stent
#8
Fan Zhao, Wen Xue, Fujun Wang, Chenglong Yu, Haiyan Xu, Yi Hao, Lu Wang
The radial performance of bioabsorbable polymeric intravascular stents is extremely important in assessing the efficiency of these devices in expanding narrow lumen, reducing stent recoil, and recovering to their original states after suffering from pulsating pressure. However, these stents remain inferior to metallic stents. Several thermal treatment conditions (60°C, 80°C, and 100°C for 1h) were investigated to improve the characteristics of poly(p-dioxanone) (PPDO) self-expandable stents. The local compressive force, stiffness, and viscoelasticity of these stents were also evaluated...
February 16, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28237653/-low-bone-mineral-density-in-juvenile-idiopathic-arthritis-prevalence-and-related-factors
#9
Rocío Galindo Zavala, Esmeralda Núñez Cuadros, Laura Martín Pedraz, Gisela Díaz-Cordovés Rego, Carlos Sierra Salinas, Antonio Urda Cardona
INTRODUCTION: Height adjustment is currently recommended for Z-score bone mineral density (BMD) assessed by dual energy X-ray absorptiometry. At present there are no studies that evaluate the prevalence of low BMD in paediatric patients with Juvenile Idiopathic Arthritis (JIA) in Spain following current recommendations. OBJECTIVES: To evaluate low BMD in JIA in paediatric patients with JIA in Spain following the latest recommendations, as well as to assess associated factors...
February 23, 2017: Anales de Pediatría: Publicación Oficial de la Asociación Española de Pediatría (A.E.P.)
https://www.readbyqxmd.com/read/28237574/cellulose-nanocomposite-films-with-in-situ-generated-silver-nanoparticles-using-cassia-alata-leaf-extract-as-a-reducing-agent
#10
P Sivaranjana, E R Nagarajan, N Rajini, M Jawaid, A Varada Rajulu
Cotton linters were dissolved in aq. (8%LiOH+15% Urea) that was pre-cooled to -12.5°C. Using this solution cellulose gel films were prepared by regeneration method with ethyl alcohol as a coagulant. These wet films were diffused with 10wt. % Cassia alata leaf extract that acted as a reducing agent. The leaf extract diffused cellulose wet films were used as the matrix. The wet matrix films were dipped individually in lower concentrated 1mM to 5mM aq.AgNO3 source solutions in the presence of sunlight and allowed the solutions to react with the diffused leaf extract reducing agent which in situ generated the silver nanoparticles (AgNPs) inside the films as well as in the source solution...
February 22, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28237470/ex-situ-groundwater-treatment-triggering-the-mobilization-of-geogenic-uranium-from-aquifer-sediments
#11
Andre Banning, Nadine Pawletko, Julia Röder, Christine Kübeck, Frank Wisotzky
Uranium (U) concentrations in groundwater extracted for drinking water usage from a Quaternary fluvial aquifer partly exceed the German drinking water guideline of 10μgL(-1). Responsible sources and mobilization processes were unknown and gave rise to this study. Land use of the watershed is mainly agricultural leading to groundwater nitrate concentrations >50mgL(-1) and a need for water treatment prior to utilization as drinking water. This is successfully accomplished by addition of nutrients triggering bacterial nitrate reduction, followed by the addition of NaOH for water softening and CO2 for pH adjustment, with subsequent reinfiltration into the aquifer...
February 23, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28236662/monomer-to-dimer-transition-of-brucella-suis-type-iv-secretion-system-component-virb8-induces-conformational-changes
#12
Mahzad Sharifahmadian, Tarun Arya, Benoit Bessette, Lauriane Lecoq, Edward Ruediger, James G Omichinski, Christian Baron
Secretion systems are protein complexes essential for bacterial virulence and potential targets for anti-virulence drugs. In the intracellular pathogen Brucella suis, a type IV secretion system mediates the translocation of virulence factors into host cells and it is essential for pathogenicity. VirB8 is a core component of the secretion system and dimerization is important for functionality of the protein complex. We set out to study dimerization and possible conformational changes of VirB8 from Brucella suis (VirB8s) using nuclear magnetic resonance, X-ray crystallography and differential scanning fluorimetry...
February 25, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28235361/nanoporous-polymer-films-of-cyanate-ester-resins-designed-by-using-ionic-liquids-as-porogens
#13
Alexander Fainleib, Alina Vashchuk, Olga Starostenko, Olga Grigoryeva, Sergiy Rogalsky, Thi-Thanh-Tam Nguyen, Daniel Grande
Novel nanoporous film materials of thermostable cyanate ester resins (CERs) were generated by polycyclotrimerization of dicyanate ester of bisphenol E in the presence of varying amounts (from 20 to 40 wt%) of an ionic liquid (IL), i.e., 1-heptylpyridinium tetrafluoroborate, followed by its quantitative extraction after complete CER network formation. The completion of CER formation and IL extraction was assessed using gel fraction content determination, FTIR, (1)H NMR, and energy-dispersive X-ray spectroscopy (EDX)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28231455/synthetic-investigation-physicochemical-characterization-and-antibacterial-evaluation-of-ternary-bi-iii-systems-with-hydroxycarboxylic-acid-and-aromatic-chelator-substrates
#14
C M Nday, E Halevas, A Tsiaprazi-Stamou, D Eleftheriadou, A Hatzidimitriou, G Jackson, D Reid, A Salifoglou
Due to its physical and chemical properties, bismuth (Bi(III)) is widely used in the treatment of several gastrointestinal and skin diseases, and infections caused by bacteria. Herein, its known antimicrobial potential was taken into consideration in the synthesis of two new hybrid ternary materials of Bi(III) with the physiological α-hydroxycarboxylic glycolic acid and 1,10-phenanthroline (phen), [Bi2(C2H2O3)2(C2H3O3)(NO3)]n(.) nH2O (1) and [Bi(C12H8N2)(NO3)4](C10H8N4) (2), aiming at improving its antibacterial properties...
February 11, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28230900/x-ray-diffraction-and-rietveld-refinement-in-deferrified-clays-for-forensic-science
#15
Luis V Prandel, Vander de F Melo, André M Brinatti, Sérgio da C Saab, Fábio A S Salvador
Soil vestiges might provide information about a crime scene. The Rietveld method with X-ray diffraction data (RM-XRD) is a nondestructive technique that makes it possible to characterize minerals present in the soils. Soil clays from the metropolitan region of Curitiba (Brazil) were submitted to DCB treatment and analyzed using XRD with CuKα radiation in the step-scan mode (0.02° 2θ/5 s). The GSAS+EXPGUI software was used for RM refinement. The RM-XRD results, together with the principal component analysis (PCA) (52...
February 23, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28230756/synthesis-and-structural-evaluation-of-organo-ruthenium-complexes-with-%C3%AE-diketonates
#16
Matija Uršič, Tanja Lipec, Anton Meden, Iztok Turel
Four novel ruthenium organometallic complexes: [(η⁶-p-cymene)Ru(4,4,4-trifluoro-1-(4-bromophenyl)-1,3-butanedione)Cl] (1), [(η⁶-p-cymene)Ru(4,4,4-trifluoro-1-(4-bromophenyl)-1,3-butanedione)pta]PF₆ (2), [(η⁶-p-cymene)Ru(4,4,4-trifluoro-1-(4-iodophenyl)-1,3-butanedione)Cl] (3) and [(η⁶-p-cymene)Ru(4,4,4-trifluoro-1-(4-iodophenyl)-1,3-butanedione)pta]PF₆ (4) were synthesized and characterized by elemental analysis, infrared (IR), UV-Vis, NMR and mass spectroscopy and single-crystal X-ray diffraction...
February 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28230223/observation-of-charge-transfer-cascades-in-%C3%AE-fe2o3-irox-photoanodes-by-operando-x-ray-absorption-spectroscopy
#17
Alessandro Minguzzi, Alberto Naldoni, Ottavio Lugaresi, Elisabetta Achilli, Francesco D'Acapito, Francesco Malara, Cristina Locatelli, Alberto Vertova, Sandra Rondinini, Paolo Ghigna
Electrochemical devices for energy conversion and storage are central for a sustainable economy. The performance of electrodes is driven by charge transfer across different layer materials and an understanding of the mechanistics is pivotal to gain improved efficiency. Here, we directly observe the transfer of photogenerated charge carriers in a photoanode made of hematite (α-Fe2O3) and a hydrous iridium oxide (IrOx) overlayer, which plays a key role in photoelectrochemical water oxidation. Through the use of operando X-ray absorption spectroscopy (XAS), we probe the change in occupancy of the Ir 5d levels during optical band gap excitation of α-Fe2O3...
February 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28230032/x-ray-cross-complementing-groups-1-rs1799782-c-t-polymorphisms-and-colorectal-cancer-susceptibility-a-meta-analysis-based-on-chinese-han-population
#18
Liming Wang, Junfeng Qian, Chunxiao Ying, Yongwei Zhuang, Xingjie Shang, Fang Xu
OBJECTIVE: X-ray cross-complementing groups 1 (XRCC1) rs1799782 C>T polymorphisms and colorectal cancer susceptibility were not clear. The purpose of this study was to evaluate the association between XRCC1 rs1799782 C>T polymorphisms and colorectal cancer susceptibility by meta-analysis. MATERIALS AND METHODS: Related databases of Medline, CNKI, and Wanfang were systematic searched for the studies related to XRCC1 rs1799782 C>T polymorphisms and colorectal cancer risk in Chinese Han population...
December 2016: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28229991/a-novel-mutation-in-the-pyrin-domain-of-the-nod-like-receptor-family-pyrin-domain-containing-protein-3-in-muckle-wells-syndrome
#19
Jian Hu, Yun Zhu, Jian-Zhong Zhang, Rong-Guang Zhang, Hou-Min Li
BACKGROUND: Cryopyrin-associated periodic syndrome (CAPS) is a group of rare, heterogeneous autoinflammatory disease characterized by interleukin (IL)-1β-mediated systemic inflammation and clinical symptoms involving skin, joints, central nervous system, and eyes. It encompasses a spectrum of three clinically overlapping autoinflammatory syndromes including familial cold autoinflammatory syndrome, Muckle-Wells syndrome (MWS), and neonatal-onset multisystem inflammatory disease. CAPS is associated with gain-of-function missense mutations in NOD-like receptor family pyrin domain-containing protein 3 (NLRP3), the gene encoding NLRP3...
2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28229357/experimental-determination-and-theoretical-calculation-of-the-eutectic-composition-of-cefuroxime-axetil-diastereomers
#20
Namita Dalal, Ira S Buckner, Peter L D Wildfong
Cefuroxime axetil (CFA), an ester prodrug of cefuroxime exists as a pair of diastereoemers, namely isomer A and isomer B. To enable phase diagram construction, crystallization of the diastereomers of CFA from the commercially available amorphous drug substance was carried out. Isomer A was separated with a purity approaching 100% whereas the maximum purity of isomer B was 85% as confirmed by solution state proton NMR spectroscopy. The crystalline forms of isomer A and isomer B were confirmed as forms AI and BI, respectively, based on differential scanning calorimetry (DSC) analysis and powder X-ray diffraction...
February 22, 2017: AAPS PharmSciTech
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