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https://www.readbyqxmd.com/read/28340527/synthesis-and-adsorption-properties-of-4-vinylpyridine-and-styrene-copolymer-in-situ-immobilized-on-silica-surface
#1
E S Yanovska, L O Vretik, O A Nikolaeva, Y Polonska, D Sternik, O Yu Kichkiruk
Copolymer of 4-vinylpyridine with styrene was in situ immobilized on silica gel surface via the heterogeneous radical polymerization. Anchorage of the copolymer on the surface layer was confirmed by IR spectroscopy. The quantity of copolymer on the silica gel surface was evaluated as 25.73 wt.% by TG and DSC-MS analysis. "Islet" location of polymer layer on the silica surface was confirmed by the scanning electron microscopy. A high adsorption activity of silica gel with immobilized copolymer towards microquantitatives of Cu(II), Cd(II), Pb(II), Fe(III), and Ni(II) ions in steady state conditions as well as of Ni(II) ions in dynamic regime was found...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28340524/controlled-hydrothermal-synthesis-and-photoluminescence-of-nanocrystalline-znga2o4-cr-3-monospheres
#2
Tian Luan, Jinhan Liu, Xiaoxue Yuan, Ji-Guang Li
The hydrothermal synthesis of nanocrystalline ZnGa2O4:Cr(3+) (ZGC) red phosphor monospheres was accomplished in this work, and the effects of system pH, reactant content, reaction time, and citrate anions (Cit(3-)) on the phase and morphology evolution of the product were systematically studied. Under the optimized conditions of Cit(3-)/M = 1.0 molar ratio (M = total cations), pH = 5.0, and 0.2 mmol of Zn(2+), well-dispersed ZGC monospheres with an average diameter of ~454 ± 56 nm (average crystallite size ~15 nm) were successfully obtained via hydrothermal reaction at 180 °C for 18 h...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28340522/tin-oxide-carbon-coated-sepiolite-nanofibers-with-enhanced-lithium-ion-storage-property
#3
Kai Hou, Xin Wen, Peng Yan, Aidong Tang, Huaming Yang
Natural sepiolite (Sep) nanofibers were coated with carbon and nanoscale SnO2 to prepare an emerging nanocomposite (SnO2-C@Sep), which exhibited enhanced electrochemical performance. Sepiolite could act as a steady skeleton, carbon coating principally led sepiolite from an isolated to an electric state, and decoration of nanoscale SnO2 was beneficial to the functionization of sepiolite. Cycling performances indicated that SnO2-C@Sep showed higher discharge capacities than commercial SnO2 after 50 cycles. The nanocomposite SnO2-C@Sep possessed enhanced lithium storage properties with stable capacity retention and low cost, which could open up a new strategy to synthesize a variety of functional hybrid materials based on the cheap and abundant clay and commercialization of lithium-metal oxide batteries...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28340512/activation-mechanisms-of-%C3%AE-v%C3%AE-3-integrin-by-binding-to-fibronectin-a-computational-study
#4
Lingyun Wang, Di Pan, Qi Yan, Yuhua Song
Integrin αVβ3 plays an important role in regulating cellular activities and in human diseases. Although the structure of αVβ3 has been studied by crystallography and electron microscopy, the detailed activation mechanism of integrin αVβ3 induced by fibronectin (Fn) remains unclear. In this study, we investigated the conformational and dynamical motion changes of Mn(2+) -bound integrin αVβ3 by binding to Fn with molecular dynamics simulations. Results showed that Fn binding to integrin αVβ3 caused the changes of the conformational flexibility of αVβ3 domains, the essential mode of motion for the domains of αV subunit and β3 subunit and the degrees of correlated motion of residues between the domains of αV subunit and β3 subunit of integrin αVβ3...
March 24, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28340481/metabolic-profiling-of-tyrosine-tryptophan-and-glutamate-in-human-urine-using-gas-chromatography-tandem-mass-spectrometry-combined-with-single-spe-cleanup
#5
Hyun Ju Shin, Na Hyun Park, Wonwoong Lee, Man Ho Choi, Bong Chul Chung, Jongki Hong
The tyrosine, tryptophan, and glutamate metabolic pathways play key roles on pathological state of neuronal functions and the change of their levels in biological systems reflects the progress degree of neuronal diseases. Comprehensive profiling of these metabolites is important to find new biomarkers for diagnosis or prognosis of various neuronal diseases. However, the overall profiling analysis of various neurochemicals in biological sample is confronted with several limitations due to their low concentration and physicochemical properties and the coexistence of matrices...
March 16, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28340480/using-uhplc-q-trap-ms-as-a-complementary-technique-to-in-depth-mine-uplc-q-tof-ms-data-for-identifying-modified-nucleosides-in-urine
#6
Zhiwei Lu, Qing Wang, Meiling Wang, Shuang Fu, Qingqing Zhang, Zhixin Zhang, Huizhen Zhao, Yuehong Liu, Zhenhai Huang, Ziye Xie, Honghong Yu, Xiaoyan Gao
Modified nucleosides, metabolites of RNA, are potential biomarkers of cancer before the appearance of morphological abnormalities. It is of great significance to comprehensively detect and identify nucleosides in human urine for discovery of cancer biomarkers. However, the lower abundance, the greater polarity and the matrix effects make it difficult to detect urinary nucleosides. In this paper, an integrated method consisted of sample preparation followed by ultraperformance liquid chromatography quadrupole time-of-flight mass spectrometry (UPLC Q-TOF/MS) detection and primary identification, then ultra-high performance liquid chromatography coupled with hybrid triple quadrupole linear ion trap mass spectrometer (UHPLC Q-Trap/MS) further identification and validation were introduced...
March 12, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28340471/chemotaxonomic-studies-of-nine-paris-species-from-china-based-on-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry-and-fourier-transform-infrared-spectroscopy
#7
Yuanzhong Wang, Ehu Liu, Ping Li
Paris species, which contain steroid saponins, have been used as herb folk medicines in Asia. In the present study, a comprehensive strategy based on liquid chromatography-tandem mass spectrometry (LC-MS/MS) and Fourier transform infrared (FT-IR) spectroscopy was firstly proposed to evaluate the chemotaxonomic relationships of nine Paris species sampled from different geographical regions in China. Principle component analysis (PCA) based on FT-IR data revealed chemical similarities in term of the nine species and geographical regions, indicating the accumulation of metabolites affected by the combination of geographical factors and species...
March 18, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28340464/a-review-on-various-electrochemical-techniques-for-heavy-metal-ions-detection-with-different-sensing-platforms
#8
REVIEW
BabanKumar Bansod, Tejinder Kumar, Ritula Thakur, Shakshi Rana, Inderbir Singh
Heavy metal ions are non-biodegradable and contaminate most of the natural resources occurring in the environment including water. Some of the heavy metals including Lead (Pb), Mercury (Hg), Arsenic (As), Chromium (Cr) and Cadmium (Cd) are considered to be highly toxic and hazardous to human health even at trace levels. This leads to the requirement of fast, accurate and reliable techniques for the detection of heavy metal ions. This review presents various electrochemical detection techniques for heavy metal ions those are user friendly, low cost, provides on-site and real time monitoring as compared to other spectroscopic and optical techniques...
March 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28340416/nonradical-oxidation-from-electrochemical-activation-of-peroxydisulfate-at-ti-pt-anode-efficiency-mechanism-and-influencing-factors
#9
Haoran Song, Linxia Yan, Jun Ma, Jin Jiang, Guangqiang Cai, Wenjuan Zhang, Zhongxiang Zhang, Jiaming Zhang, Tao Yang
Electrochemical activation of peroxydisulfate (PDS) at Ti/Pt anode was systematically investigated for the first time in this work. The synergistic effect produced from the combination of electrolysis and the addition of PDS demonstrates that PDS can be activated at Ti/Pt anode. The selective oxidation towards carbamazepine (CBZ), sulfamethoxazole (SMX), propranolol (PPL), benzoic acid (BA) rather than atrazine (ATZ) and nitrobenzene (NB) was observed in electrochemical activation of PDS process. Moreover, addition of excess methanol or tert-butanol had negligible impact on CBZ (model compound) degradation, demonstrating that neither sulfate radical (SO4(-)) nor hydroxyl radical (HO) was produced in electrochemical activation of PDS process...
March 21, 2017: Water Research
https://www.readbyqxmd.com/read/28340396/spectral-studies-on-anthracene-based-dual-sensor-for-hg-2-and-al-3-ions-with-two-distinct-output-modes-of-detection
#10
Navneet Kaur, Baljeet Kaur
A simple and easily synthesized colorimetric and fluorescent chemosensor 1, based on aromatic OH and imine moieties as a binding and anthracene as signaling unit, has been synthesized in a one-step procedure. The chemosensor 1 is developed as a dual chemosensor for detection of Hg(2+) and Al(3+) ions in CH3OH, which exhibited a color change from light yellow to dark yellow with Hg(2+) ions, enabling 1 a suitable "bare eye" indicator for Hg(2+) ions. On the other hand, fluorescent enhancement with blue shift along with brilliant cyan fluorescence was observed upon binding with Al(3+) ions...
March 15, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28340353/molecular-structure-of-the-human-cftr-ion-channel
#11
Fangyu Liu, Zhe Zhang, László Csanády, David C Gadsby, Jue Chen
The cystic fibrosis transmembrane conductance regulator (CFTR) is an ATP-binding cassette (ABC) transporter that uniquely functions as an ion channel. Here, we present a 3.9 Å structure of dephosphorylated human CFTR without nucleotides, determined by electron cryomicroscopy (cryo-EM). Close resemblance of this human CFTR structure to zebrafish CFTR under identical conditions reinforces its relevance for understanding CFTR function. The human CFTR structure reveals a previously unresolved helix belonging to the R domain docked inside the intracellular vestibule, precluding channel opening...
March 23, 2017: Cell
https://www.readbyqxmd.com/read/28340294/a-well-defined-osmium-cupin-complex-hyperstable-artificial-osmium-peroxygenase
#12
Nobutaka Fujieda, Takumi Nakano, Yuki Taniguchi, Haruna Ichihashi, Hideki Sugimoto, Yuma Morimoto, Yosuke Nishikawa, Genji Kurisu, Shinobu Itoh
Thermally stable TM1459 cupin superfamily protein from Thermotoga maritima was repurposed as an osmium (Os) peroxygenase by metal-substitution strategy employing the metal-binding promiscuity. This novel artificial metalloenzyme bears a datively bound Os ion supported by the 4-histidine motif. The well-defined Os center is responsible for not only the catalytic activity but also the thermodynamic stability of the protein folding, leading to the robust biocatalyst (Tm ≈ 120 °C). The spectroscopic analysis and atomic resolution X-ray crystal structures of Os-bound TM1459 revealed two types of donor sets to Os center with octahedral coordination geometry...
March 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28339978/ozone-sensitive-arabidopsis-mutants-with-deficiencies-in-photorespiratory-enzymes
#13
Shoko Saji, Srinivas Bathula, Akihiro Kubo, Masanori Tamaoki, Mitsuko Aono, Tomoharu Sano, Kazuo Tobe, Stefan Timm, Hermann Bauwe, Nobuyoshi Nakajima, Hikaru Saji
An ozone-sensitive mutant was isolated from T-DNA-tagged lines of Arabidopsis thaliana. The T-DNA was inserted at a locus on chromosome 3, where two genes encoding glycolate oxidases, GOX1 and GOX2, peroxisomal enzymes involved in photorespiration, reside contiguously. The amounts of the mutant's foliar transcripts for these genes were reduced, and glycolate oxidase activity was approximately 60% of that of the wild-type plants. No difference in growth and appearance was observed between the mutant and the wild-type plants under normal conditions with ambient air under a light intensity of 100 µmol photons m-2 s-1...
February 21, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28339846/estimation-of-whole-body-radiation-exposure-from-brachytherapy-for-oral-cancer-using-a-monte-carlo-simulation
#14
Y Ozaki, H Watanabe, A Kaida, M Miura, K Nakagawa, K Toda, R Yoshimura, Y Sumi, T Kurabayashi
Early stage oral cancer can be cured with oral brachytherapy, but whole-body radiation exposure status has not been previously studied. Recently, the International Commission on Radiological Protection Committee (ICRP) recommended the use of ICRP phantoms to estimate radiation exposure from external and internal radiation sources. In this study, we used a Monte Carlo simulation with ICRP phantoms to estimate whole-body exposure from oral brachytherapy. We used a Particle and Heavy Ion Transport code System (PHITS) to model oral brachytherapy with 192Ir hairpins and 198Au grains and to perform a Monte Carlo simulation on the ICRP adult reference computational phantoms...
February 24, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28339788/intravenous-dendritic-cell-administration-enhances-suppression-of-lung-metastasis-induced-by-carbon-ion-irradiation
#15
Ken Ando, Hidetoshi Fujita, Akihiro Hosoi, Liqiu Ma, Masaru Wakatsuki, Ken-Ichiro Seino, Kazuhiro Kakimi, Takashi Imai, Takashi Shimokawa, Takashi Nakano
Carbon-ion radiotherapy (CIRT) is an advanced radiotherapy and has achieved good local control, even in tumors that are resistant to conventional photon beam radiotherapy (PBRT). However, distant metastasis control is an important issue. Recently, the combination of radiotherapy and immunotherapy has attracted the attention. In immunotherapy, dendritic cells (DCs) play a pivotal role in the anti-tumor immune system. However, the mechanisms underlying the combination therapy of DCs and radiotherapy have been unclear...
February 27, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28339740/margin-estimation-and-disturbances-of-irradiation-field-in-layer-stacking-carbon-ion-beams-for-respiratory-moving-targets
#16
Shinya Tajiri, Mutsumi Tashiro, Tomohiro Mizukami, Chihiro Tsukishima, Masami Torikoshi, Tatsuaki Kanai
Carbon-ion therapy by layer-stacking irradiation for static targets has been practised in clinical treatments. In order to apply this technique to a moving target, disturbances of carbon-ion dose distributions due to respiratory motion have been studied based on the measurement using a respiratory motion phantom, and the margin estimation given by the square root of the summation Internal margin2+Setup margin2 has been assessed. We assessed the volume in which the variation in the ratio of the dose for a target moving due to respiration relative to the dose for a static target was within 5%...
February 23, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28339693/neuronal-signaling-repertoire-in-the-mammalian-sperm-functionality
#17
Alfredo Ramírez-Reveco, Franz Villarroel-Espíndola, Joan E Rodríguez-Gil, Ilona I Concha
The common embryonic origin has been a recurrent explanation to understand the presence of "neural receptors" in sperm. However, this designation has conditioned a bias marked by the classical neurotransmission model, dismissing the possibility that neurotransmitters can play specific roles in the sperm function by themselves. For instance, the launching of acrosome reaction, a fundamental sperm function, includes several steps that recall the process of presynaptic secretion. Unlike of postsynaptic neuron, whose activation is mediated by molecular interaction between neurotransmitter and postsynaptic receptors, the oocyte activation is not mediated by receptors, but by cytosolic translocation of sperm phospholipase (PLCζ)...
February 20, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28339550/the-tension-sensitive-ion-transport-activity-of-msl8-is-critical-for-its-function-in-pollen-hydration-and-germination
#18
Eric S Hamilton, Elizabeth S Haswell
All cells respond to osmotic challenges, including those imposed during normal growth and development. Mechanosensitive (MS) ion channels provide a conserved mechanism for regulating osmotic forces by conducting ions in response to increased membrane tension. We previously demonstrated that the MS ion channel MscS-Like 8 (MSL8) is required for pollen to survive multiple osmotic challenges that occur during the normal process of fertilization, and that it can inhibit pollen germination. However, it remained unclear whether these physiological functions required ion flux through a mechanically gated channel provided by MSL8...
January 10, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28339498/enhancement-of-osteogenic-differentiation-of-rat-adipose-tissue-derived-mesenchymal-stem-cells-by-zinc-sulphate-under-electromagnetic-field-via-the-pka-erk1-2-and-wnt-%C3%AE-catenin-signaling-pathways
#19
Ezzatollah Fathi, Raheleh Farahzadi
Zinc ion as an essential trace element and electromagnetic fields (EMFs) has been reported to be involved in the regulation of bone metabolism. The aim of this study was to elucidate the effects of zinc sulphate (ZnSO4) on the osteogenic differentiation of adipose tissue-derived mesenchymal stem cells (ADSCs) in the presence of EMF as a strategy in osteoporosis therapy. Alkaline phophatase (ALP) activity measurement, calcium assay and expression of several osteoblastic marker genes were examined to assess the effect of ZnSO4 on the osteogenic differentiation of ADSCs under EMF...
2017: PloS One
https://www.readbyqxmd.com/read/28339347/the-aging-kidney-and-the-nephrotoxic-effects-of-mercury
#20
Christy C Bridges, Rudolfs K Zalups
Owing to advances in modern medicine, life expectancies are lengthening and leading to an increase in the population of older individuals. The aging process leads to significant alterations in many organ systems, with the kidney being particularly susceptible to age-related changes. Within the kidney, aging leads to ultrastructural changes such as glomerular and tubular hypertrophy, glomerulosclerosis, and tubulointerstitial fibrosis, which may compromise renal plasma flow (RPF) and glomerular filtration rate (GFR)...
2017: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
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