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https://www.readbyqxmd.com/read/27914330/synergistic-effect-of-p-n-heterojunction-supporting-and-zeolite-nanoparticles-in-enhanced-photocatalytic-activity-of-nio-and-sno2
#1
Hadis Derikvandi, Alireza Nezamzadeh-Ejhieh
Increased photocatalytic activity of NiO and SnO2 was achieved by coupling and supporting of them onto clinoptilolite nanoparticles (NC) via calcination of Ni(II)-Sn(IV) - exchanged NC in photocatalytic degradation of metronidazole (MZ) aqueous solution. XRD, XRF, FTIR, SEM, X-ray mapping, DRS, TEM, BET Cyclic voltammetry and electrochemical impedance spectroscopy techniques (EIS) were used for characterization of samples. Red shift occurred in bang gap energies of the coupled semiconductors with respect to monocomponent one...
November 21, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27863688/determination-of-the-activity-of-maleimide-functionalized-phospholipids-during-preparation-of-liposomes
#2
Mira Oswald, Simon Geissler, Achim Goepferich
Numerous examples exist in the literature for the use of maleimide-thiol-reactions in the area of functionalized nanoparticles. Although the hydrolysis tendency of maleimides is well-known, qualitative and quantitative information on the stability and reactivity of maleimide groups during preparation and in final formulations are missing. This is surprising, since hydrolysis of maleimides prevents nanoparticle functionalization and results in an increase of negative surface charge due to the hydrolysis product maleic acid...
November 30, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27859480/phospholipid-bilayer-affinities-and-solvation-characteristics-by-electrokinetic-chromatography-with-a-nanodisc-pseudostationary-phase
#3
William M Penny, Harmen B Steele, J B Alexander Ross, Chistopher P Palmer
Phospholipid bilayer nanodiscs composed of 1,2-dimyristoyl-sn-glycero-3- phosphocholine and synthetic maleic acid-styrene copolymer belts have been introduced as a pseudostationary phase (PSP) in electrokinetic chromatography and demonstrated good performance. The nanodiscs provide a suitable migration range and high theoretical plate counts. Using this nanodisc PSP, the affinity of the bilayer structure for probe solutes was determined and characterized. Good correlation is observed between retention factors and octanol water partition coefficients for particular categories of solutes, but the general correlation is weak primarily because the nanodiscs show stronger affinity than octanol for hydrogen bond donors...
November 14, 2016: Electrophoresis
https://www.readbyqxmd.com/read/27855331/phenanthrene-degradation-in-soil-by-ozonation-effect-of-morphological-and-physicochemical-properties
#4
J Rodriguez, A García, T Poznyak, I Chairez
The aim of this study was to characterize the ozone reaction with phenanthrene adsorbed in two types of soils (sand and agricultural). The effect of soil physicochemical properties (texture, bulk density, particle density, porosity, elemental composition, permeability, surface area and pore volume) on the phenanthrene decomposition was evaluated. Commercial sand has a uniform morphology (spherical) with a particle size range between 0.178 and 0.150 mm in diameter, regular elemental composition SiO2, specific density of 1701...
November 14, 2016: Chemosphere
https://www.readbyqxmd.com/read/27854308/characterization-of-chemically-induced-bacterial-ghosts-bgs-using-sodium-hydroxide-induced-vibrio-parahaemolyticus-ghosts-vpgs
#5
Hyun Jung Park, Sung Oh, Nagarajan Vinod, Seongmi Ji, Han Byul Noh, Jung Mo Koo, Su Hyeong Lee, Sei Chang Kim, Ki-Sung Lee, Chang Won Choi
Acellular bacterial ghosts (BGs) are empty non-living bacterial cell envelopes, commonly generated by controlled expression of the cloned lysis gene E of bacteriophage PhiX174. In this study, Vibrio parahaemolyticus ghosts (VPGs) were generated by chemically-induced lysis and the method is based on minimum inhibitory concentration (MIC) of sodium hydroxide (NaOH), acetic acid, boric acid, citric acid, maleic acid, hydrochloric acid, and sulfuric acid. The MIC values of the respective chemicals were 3.125, 6...
November 15, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27815573/solubilization-of-lipids-and-lipid-phases-by-the-styrene-maleic-acid-copolymer
#6
Juan J Dominguez Pardo, Jonas M Dörr, Aditya Iyer, Ruud C Cox, Stefan Scheidelaar, Martijn C Koorengevel, Vinod Subramaniam, J Antoinette Killian
A promising tool in membrane research is the use of the styrene-maleic acid (SMA) copolymer to solubilize membranes in the form of nanodiscs. Since membranes are heterogeneous in composition, it is important to know whether SMA thereby has a preference for solubilization of either specific types of lipids or specific bilayer phases. Here, we investigated this by performing partial solubilization of model membranes and analyzing the lipid composition of the solubilized fraction. We found that SMA displays no significant lipid preference in homogeneous binary lipid mixtures in the fluid phase, even when using lipids that by themselves show very different solubilization kinetics...
November 4, 2016: European Biophysics Journal: EBJ
https://www.readbyqxmd.com/read/27813108/antagonistic-effect-of-n-ethylmaleimide-on-arsenic-mediated-oxidative-stress-induced-poly-adp-ribosyl-ation-and-cytotoxicity
#7
Alexander Sheng-Shin Wang, Yu-Ting Chou, Yeong-Shiau Pu
Long-term exposure to arsenic has been known to induce neoplastic initiation and progression in several organs; however, the role of arsenic (As2 O3 ) in oxidative stress-mediated DNA damage remains elusive. One of the immediate cellular responses to DNA damage is poly(ADP-ribosyl)ation (PARylation), which mediates DNA repair and enhances cell survival. In this study, we found that oxidative stress (H2 O2 )-induced PARylation was suppressed by As2 O3 exposure in different human cancer cells. Moreover, As2 O3 treatment promoted H2 O2 -induced DNA damage and apoptosis, leading to increased cell death...
November 4, 2016: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/27806279/effect-of-polymer-composition-and-ph-on-membrane-solubilization-by-styrene-maleic-acid-copolymers
#8
Stefan Scheidelaar, Martijn C Koorengevel, Cornelius A van Walree, Juan J Dominguez, Jonas M Dörr, J Antoinette Killian
The styrene-maleic acid (SMA) copolymer is rapidly gaining attention as a tool in membrane research, due to its ability to directly solubilize lipid membranes into nanodisk particles without the requirement of conventional detergents. Although many variants of SMA are commercially available, so far only SMA variants with a 2:1 and 3:1 styrene-to-maleic acid ratio have been used in lipid membrane studies. It is not known how SMA composition affects the solubilization behavior of SMA. Here, we systematically investigated the effect of varying the styrene/maleic acid on the properties of SMA in solution and on its interaction with membranes...
November 1, 2016: Biophysical Journal
https://www.readbyqxmd.com/read/27796169/effect-of-application-time-of-maleic-acid-on-smear-layer-removal-and-mechanical-properties-of-root-canal-dentin
#9
Lin Wang, Yu Zhao, Liqin Mei, Haiyang Yu, Ibrahim Muhammad, Yihuai Pan, Shengbin Huang
OBJECTIVES: To evaluate the effect of maleic acid (MA) on the cleaning efficacy and mechanical properties of root canal dentine with respect to different time exposure. MATERIALS AND METHODS: One hundred and eighty single-canal premolars were instrumented with rotary-files and then randomly assigned to test groups receiving 7% MA for 30 s, 45 s, 1 min, or 3 min or to control groups treated with 0.9% saline or 17% ethylenediaminetetraacetic acid for 45 s...
October 31, 2016: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/27757116/down-regulation-of-korrigan-like-endo-%C3%AE-1-4-glucanase-genes-impacts-carbon-partitioning-mycorrhizal-colonization-and-biomass-production-in-populus
#10
Udaya C Kalluri, Raja S Payyavula, Jessy L Labbé, Nancy Engle, Garima Bali, Sara S Jawdy, Robert W Sykes, Mark Davis, Arthur Ragauskas, Gerald A Tuskan, Timothy J Tschaplinski
A greater understanding of the genetic regulation of plant cell wall remodeling and the impact of modified cell walls on plant performance is important for the development of sustainable biofuel crops. Here, we studied the impact of down-regulating KORRIGAN-like cell wall biosynthesis genes, belonging to the endo-β-1,4-glucanase gene family, on Populus growth, metabolism and the ability to interact with symbiotic microbes. The reductions in cellulose content and lignin syringyl-to-guaiacyl unit ratio, and increase in cellulose crystallinity of cell walls of PdKOR RNAi plants corroborated the functional role of PdKOR in cell wall biosynthesis...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27754382/quantitative-nuclear-magnetic-resonance-spectroscopy-based-on-pulcon-methodology-application-to-quantification-of-invaluable-marine-toxin-okadaic-acid
#11
Ryuichi Watanabe, Chika Sugai, Taichi Yamazaki, Ryoji Matsushima, Hajime Uchida, Masahiro Matsumiya, Akiko Takatsu, Toshiyuki Suzuki
ERETIC2 (Electronic Reference To access In vivo Concentrations 2) based on PULCON (Pulse Length-based Concentration determination) methodology is a quantitative NMR (qNMR) using an external standard. The performance of the PULCON method was assessed using maleic acid (MA). Quantification of the diarrhetic shellfish toxin and okadaic acid by PULCON was successfully consistent with that obtained by a conventional internal standard method, demonstrating that the PULCON method is useful for the quantification of invaluable marine toxins without any contaminations by an internal standard...
October 13, 2016: Toxins
https://www.readbyqxmd.com/read/27741396/polycationic-nanofibers-for-nucleic-acid-scavenging
#12
Jennifer Gamboa Jackman, Hemraj Juwarker, Luke P Poveromo, Howard Levinson, Kam W Leong, Bruce A Sullenger
Dying cells release nucleic acids (NA) and NA-containing complexes that activate inflammatory pathways of immune cells. Sustained activation of these pathways contributes to chronic inflammation frequently encountered in autoimmune and inflammatory diseases. In this study, grafting of cationic polymers onto a nanofibrous mesh enabled local scavenging of negatively charged pro-inflammatory molecules in the extracellular space. Nucleic acid scavenging nanofibers (NASFs) formed from poly(styrene-alt-maleic anhydride) conjugated with 1...
October 14, 2016: Biomacromolecules
https://www.readbyqxmd.com/read/27739678/evidence-of-lipid-exchange-in-styrene-maleic-acid-lipid-particle-smalp-nanodisc-systems
#13
Gavin Hazell, Thomas Arnold, Robert David Barker, Luke Ashley Clifton, Nina-Juliane Steinke, Cecilia Tognoloni, Karen J Edler
Styrene-alt-Maleic Acid lipid particles (SMALPs) are self-assembled discoidal structures composed of a polymer belt and a segment of lipid bilayer, which are capable of encapsulating membrane proteins directly from the cell membrane. Here we present evidence of the exchange of lipids between such "nanodiscs" and lipid monolayers adsorbed at either solid-liquid or air-liquid interfaces. This behavior has important implications for the potential uses of nanodiscs, including the potential to control lipid composition within nanodiscs containing membrane proteins...
October 14, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27736675/effects-of-root-exudates-on-gel-beads-reeds-combination-remediation-of-high-molecular-weight-polycyclic-aromatic-hydrocarbons
#14
Weijun Tian, Jing Zhao, Yuhang Zhou, Kaili Qiao, Xin Jin, Qing Liu
Changes in root exudates, including low molecular weight organic acids (LMWOAs), amino acids and sugars, in rhizosphere soils during the gel-beads/reeds combination remediation for high molecular weight polycyclic aromatic hydrocarbons (HMW-PAHs) and the degree of the effects on HMW-PAH biodegradation were evaluated in this study. The results showed that the gel-beads/reeds combination remediation notably increased the removal rates of pyrene, benzo(a)pyrene and indeno(1,2,3-cd)pyrene (65.0-68.9%, 60.0-68.5% and 85...
October 10, 2016: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/27694389/membrane-protein-extraction-and-purification-using-styrene-maleic-acid-sma-co-polymer-effect-of-variations-in-polymer-structure
#15
Kerrie A Morrison, Aneel Akram, Ashlyn Mathews, Zoeya A Khan, Jaimin H Patel, Chumin Zhou, David John Hardy, Charles Moore-Kelly, Roshani Patel, Victor Odiba, Tim Knowles, Masood-Ul-Hassan Javed, Nikola P Chmel, Timothy R Dafforn, Alice Jane Rothnie
The use of styrene maleic acid (SMA) co-polymers to extract and purify transmembrane proteins, whilst retaining their native bilayer environment, overcomes many of the disadvantages associated with conventional detergent based procedures. This approach has huge potential for the future of membrane protein structural and functional studies. In this investigation we have systematically tested a range of commercially available SMA polymers, varying in both the ratio of styrene to maleic acid and in total size, for the ability to extract, purify and stabilise transmembrane proteins...
September 30, 2016: Biochemical Journal
https://www.readbyqxmd.com/read/27693338/targeted-delivery-of-doxorubicin-to-breast-cancer-cells-by-magnetic-lhrh-chitosan-bioconjugated-nanoparticles
#16
Jaleh Varshosaz, Farshid Hassanzadeh, Hojat Sadeghi Aliabadi, Fatemeh Rabbani Khoraskani, Mina Mirian, Behshid Behdadfar
The novel dual targeted nanoparticles loaded with doxorubicin (DOX) and magnetic nanoparticles (MNPs) were prepared for treatment of breast cancer. Nanoparticles were produced by a layer-by-layer technique and functionalized with a bioconjugate of chitosan-poly(methyl vinyl ether maleic acid)(PMVMA)-LHRH to target LHRH receptors. The successful production of chitosan-PMVMA copolymer and its conjugation to LHRH was confirmed by FTIR and (1)HNMR spectroscopy. Capillary electrophoresis analysis showed 72.51% LHRH conjugation efficiency...
September 28, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27685977/removal-of-copper-ions-from-aqueous-solution-by-the-sodium-salt-of-the-maleic-acid-allylpropionate-styrene-terpolymer
#17
Elchin Akperov, Oktay Akperov, Elnara Jafarova, Sabahiye Gafarova
The sodium salt of the maleic acid-allylpropionate-styrene terpolymer was used for recovery of copper ions from aqueous solution. Effects of contact time, sorbent weight and initial Cu(2+) ion concentrations on removal efficiency were tested. The maximum experimental sorption capacity of the sorbent for copper ions is 0.71 g g(-1). The sorption isotherm of copper ions onto a prepared polymer sorbent has been studied and the equilibrium data were analyzed using Langmuir and Freundlich isotherm models. The adsorption isotherm data showed that copper ions adsorption on the sorbent was better fitted to the Langmuir isotherm model...
September 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27652250/comparative-analysis-of-endodontic-smear-layer-removal-efficacy-of-17-ethylenediaminetetraacetic-acid-7-maleic-acid-and-2-chlorhexidine-using-scanning-electron-microscope-an-in-vitro-study
#18
Kailash Attur, Mathew T Joy, Riyas Karim, V J Anil Kumar, C Deepika, Haseena Ahmed
AIM: The aim of the present study was to evaluate the efficiency of different endodontic irrigants in the removal of smear layer through scanning electron microscopic image analysis. MATERIALS AND METHODS: The present in vitro study was carried out on 45 single-rooted extracted human mandibular premolar teeth with single canal and complete root formation. Teeth were randomly assigned to three groups with 15 teeth in each group. Group I samples were irrigated with 17% ethylenediaminetetraacetic (EDTA) irrigation, Group II with 7% maleic acid irrigation, and Group III with 2% chlorhexidine irrigation...
August 2016: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/27620699/retracted-ph-responsive-polymer-conjugate-of-pirarubicin-with-styrene-maleic-acid-copolymer-as-a-potential-therapeutic-for-ovarian-cancer
#19
Lifeng Liu, Jinghua Sun, Hongzhuan Yin, Jun Fang, Xianyu Jin
No abstract text is available yet for this article.
October 2016: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27620332/isolation-of-yeast-complex-iv-in-native-lipid-nanodiscs
#20
Irina A Smirnova, Dan Sjöstrand, Fei Li, Markus Björck, Jacob Schäfer, Henrik Östbye, Martin Högbom, Christoph von Ballmoos, Gabriel C Lander, Pia Ädelroth, Peter Brzezinski
We used the amphipathic styrene maleic acid (SMA) co-polymer to extract cytochrome c oxidase (CytcO) in its native lipid environment from S. cerevisiae mitochondria. Native nanodiscs containing one CytcO per disc were purified using affinity chromatography. The longest cross-sections of the native nanodiscs were 11nm×14nm. Based on this size we estimated that each CytcO was surrounded by ~100 phospholipids. The native nanodiscs contained the same major phospholipids as those found in the mitochondrial inner membrane...
December 2016: Biochimica et Biophysica Acta
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