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https://www.readbyqxmd.com/read/28934661/dextran-coated-silver-nanoparticles-chemical-sensor-for-selective-cysteine-detection
#1
Slađana Davidović, Vesna Lazić, Ivana Vukoje, Jelena Papan, S Phillip Anhrenkiel, Suzana Dimitrijević, Jovan M Nedeljković
A simple, fast and non-costly method for selective cysteine (Cys) detection, based on optical changes of silver colloids, is developed. For that purpose, stable colloids consisting of silver nanoparticles (Ag NPs) coated with polysaccharide dextran (Dex), isolated from bacterium species Leuconostoc mesenteroides T3, were prepared. The synthesized samples were thoroughly characterized including absorption and FTIR spectroscopy, as well as transmission electron microscopy and X-ray diffraction analysis. The silver colloids display high sensitivity and selectivity towards Cys detection in aqueous solutions...
September 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28934607/a-visible-light-driven-heterojuncted-composite-wo3-bi12o17cl2-synthesis-characterization-and-improved-photocatalytic-performance
#2
Jiaojiao Zheng, Fei Chang, Mingzhi Jiao, Quan Xu, Baoqing Deng, Xuefeng Hu
Novel visible-light-driven WO3/Bi12O17Cl2 heterojuncted photocatalysts with different mass ratios were successfully fabricated by a facile hydrothermal process and were characterized by XRD, UV-Vis DRS, SEM, TEM, HRTEM, XPS, BET, Raman, PL, and ESR techniques. The original morphology of Bi12O17Cl2 was maintained after the addition of WO3 nanoparticles and the specific surface area values of WBx composites were obviously enlarged. The intimate contact of both components in HRTEM confirmed the generation of smooth phase interface...
September 14, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28934354/synthesis-of-irregular-graphene-oxide-tubes-using-green-chemistry-and-their-potential-use-as-reinforcement-materials-for-biomedical-applications
#3
Ángel Serrano-Aroca, Sanjukta Deb
Micrometer length tubes of graphene oxide (GO) with irregular form were synthesised following facile and green metal complexation reactions. These materials were obtained by crosslinking of GO with calcium, zinc or strontium chlorides at three different temperatures (24, 34 and 55°C) using distilled water as solvent for the compounds and following a remarkably simple and low-cost synthetic method, which employs no hazardous substances and is conducted without consumption of thermal or sonic energy. These irregular continuous GO networks showed a very particular interconnected structure by Field Emission Scanning Electron Microscopy with Energy-Disperse X-Ray Spectroscopy for elemental analysis and High-resolution Transmission Electron Microscopy with Scanning Transmission Electron Microscope Dark Field Imaging, and were analysed by Raman Spectroscopy...
2017: PloS One
https://www.readbyqxmd.com/read/28933535/development-of-visible-light-induced-photoelectrochemical-platform-based-on-cyclometalated-iridium-iii-complex-for-bioanalysis
#4
Chunxiang Li, Weisen Lu, Ming Zhu, Bo Tang
The performance of the photoelectrochemical (PEC) bioanalysis relies closely on the properties of the usedphotoactive species. In this study, a visible-light induced PEC active species, [(C6)2Ir(dcbpy)]+PF6- (C6 = coumarin 6, dcbpy = 2,2'-bipyridine-4,4'-dicarboxylic acid) was prepared based on C6 with the stronger absorbance in the visible region. The as-prepared complex was characterized by 1H NMR,UV-visible absorption and cyclic voltammetry. It exhibits intense absorption in visible region at 480 nm with a molar extinction coefficient (ε) of more 40000 M-1cm-1, which is approximately twice that of Ru(bpy)32+...
September 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28933289/recent-applications-of-silver-amalgam-electrodes-for-analysis-of-pharmaceuticals-and-vitamins
#5
Sylwia Smarzewska, Radovan Metelka, Bogusław Baś, Karel Vytřas
The features and applications of silver amalgam electrodes in electroanalysis of pharmaceuticals and vitamins are summarized in this review. The state-of-art in the preparation and construction of solid silver amalgam electrodes for prolonged and user-friendly use is presented. Although not as widely spread as other electrode materials, silver amalgam possesses a unique and viable combination of favorable electrochemical properties, which are close to ideal mercury electrodes, non-toxic character, high durability and mechanical stability, if properly prepared...
September 20, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28933217/implantation-of-brain-derived-extracellular-matrix-enhances-neurological-recovery-after-traumatic-brain-injury
#6
Yun Wu, Jiayin Wang, Yejie Shi, Hongjian Pu, Rehana K Leak, Anthony K F Liou, Stephen F Badylak, Zhixiong Liu, Jun Zhang, Jun Chen, Ling Chen
Scaffolds composed of extracellular matrix (ECM) are being investigated for their ability to facilitate brain tissue remodeling and repair following injury. The present study tested the hypothesis that the implantation of brain-derived ECM would attenuate experimental traumatic brain injury (TBI) and explored potential underlying mechanisms. TBI was induced in mice by a controlled cortical impact (CCI). ECM was isolated from normal porcine brain tissue by decellularization methods, prepared as a hydrogel, and injected into the ipsilesional corpus callosum and striatum 1 h after CCI...
July 2017: Cell Transplantation
https://www.readbyqxmd.com/read/28933154/superhydrophobic-substrates-from-off-the-shelf-laboratory-filter-paper-simplified-preparation-patterning-and-assay-application
#7
Lishen Zhang, Honoria Kwok, Xiaochun Li, Hua-Zhong Yu
Off-the-shelf laboratory filter paper of different pore-sizes and thicknesses can be modified with fluorine-free organosilanes to be superhydrophobic, patternable, and ready for quantitative assay applications. In particular, we have demonstrated that cellulose filter paper treated with a binary hexane solution of short (methyltrichlorosilane, MTS) and long (octadecyltrichlorosilane, OTS) organosilanes, exhibits remarkably high water contact angles (> 150 °) and low wetting hysteresis (~10 °). Beyond the optimized ratio between the two organosilanes, we have discovered that the thickness rather than the pore size dictates the resulting superhydrophobicity...
September 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28932830/a-lipophilic-ionic-liquid-based-on-formamidinium-cations-and-tfsi-the-electric-response-and-the-effect-of-co2-on-the-conductivity-mechanism
#8
Federico Bertasi, Guinevere A Giffin, Keti Vezzù, Giuseppe Pace, Yaser Abu-Lebdeh, Michel Armand, Vito Di Noto
This work describes the preparation of the new lipophilic ionic liquid tetraoctyl-formamidinium bis(trifluoromethanesulfonyl) imide (TOFATFSI), which is miscible with lower alkanes. In particular, this work focuses on the electric behaviour of TOFATFSI in the particularly challenging highly apolar environment of supercritical CO2. The conductivity and relaxation phenomena are revealed through the analysis of the broadband electric spectra with a particular emphasis on the effect of temperature and CO2 uptake on the IL conductivity...
September 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28932657/draw-spinning-of-kilometer-long-and-highly-stretchable-polymer-submicrometer-fibers
#9
Suiyang Liao, Xiaopeng Bai, Jianan Song, Qingyun Zhang, Jie Ren, Yusen Zhao, Hui Wu
A new method is developed to directly spinning perfectly uniaxial fibers in an ultrafast manner. Besides, this method can tune the fibers' diameter through adjusting processing parameters such as the feeding rate of precursors. Uniaxial nylon 66 fibers prepared via this method show superior mechanical properties due to the alignment in each level of the structure.
September 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28932619/extraction-of-phosphate-from-polluted-waters-using-calcium-alginate-beads-doped-with-active-carbon-derived-from-a-aspera-plant-as-adsorbent
#10
Ravulapalli Sujitha, Kunta Ravindhranath
An adsorbent prepared by entrapping active carbon derived from the stems of Achyranthes aspera plant in the calcium alginate beads (CABAA) has been investigated for its adsorption nature towards the removal of phosphate by varying various physicochemical parameters. Surface morphological studies are made using FTIR, XRD, FESEM, and EDX. The sorption mechanism is analyzed using Freundlich, Langmuir, Dubinin-Radushkevich, and Temkin adsorption isotherms. The adsorption kinetics is found to follow the pseudo-second-order model...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28932127/an-in-vitro-model-of-renal-inflammation-after-ischemic-oxidative-stress-injury-nephroprotective-effects-of-a-hyaluronan-ester-with-butyric-acid-on-mesangial-cells
#11
Olga Baraldi, Francesca Bianchi, Viola Menghi, Andrea Angeletti, Anna Laura Croci Chiocchini, Maria Cappuccilli, Valeria Aiello, Giorgia Comai, Gaetano La Manna
BACKGROUND: Acute kidney injury, known as a major trigger for organ fibrosis and independent predictor of chronic kidney disease, is characterized by mesangial cell proliferation, inflammation and unbalance between biosynthesis and degradation of extracellular matrix. Therapeutic approaches targeting the inhibition of mesangial cell proliferation and matrix expansion may represent a promising opportunity for the treatment of kidney injury. An ester of hyaluronic acid and butyric acid (HB) has shown vasculogenic and regenerative properties in renal ischemic-damaged tissues, resulting in enhanced function recovery and minor degree of inflammation in vivo...
2017: Journal of Inflammation Research
https://www.readbyqxmd.com/read/28931969/supramolecular-polymerization-of-a-ureidopyrimidinone-based-2-catenane-prepared-via-ring-closing-metathesis
#12
Abraham J P Teunissen, José Augusto Berrocal, Christiaan H W A Corbet, E W Meijer
The synthesis and supramolecular polymerization of a ureidopyrimidinone-based Sauvage-type [2]catenane is reported. The monomer synthesis explores many routes using the elegant metathesis catalysts of Bob Grubbs, yielding a catenane with one ureidopyrimidinone in each cycle. The supramolecular polymer obtained features both mechanical bonds and quadruple hydrogen bonding connections.
September 15, 2017: Journal of Polymer Science. Part A, Polymer Chemistry
https://www.readbyqxmd.com/read/28931857/eu-3-activated-la2moo6-la2wo6-red-emitting-phosphors-with-ultrabroad-excitation-band-for-white-light-emitting-diodes
#13
Peng Du, Jae Su Yu
A series of novel Eu(3+)-activated La2MoO6-La2WO6 red-emitting phosphors have been successfully prepared by a citrate-assisted sol-gel process. Both photoluminescence excitation and emission spectra suggest that the resultant products have the strong ultrabroad absorption band ranging from 220 to 450 nm. Under the excitation of 379 nm, the characteristic emissions of Eu(3+) ions corresponding to the (5)D0 → (7)F J transitions are observed in the doped samples. The optimal doping concentration for Eu(3+) ions is found to be 12 mol% and the quenching mechanism is attributed to the dipole-dipole interaction...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28931848/integrated-analysis-of-microrna-and-mrna-expression-profiles-during-the-sex-differentiation-sensitive-period-in-oriental-river-prawn-macrobrachium-nipponense
#14
Shubo Jin, Hongtuo Fu, Shengming Sun, Sufei Jiang, Yiwei Xiong, Yongsheng Gong, Hui Qiao, Wenyi Zhang, Yan Wu
Male oriental river prawns (Macrobrachium nipponense) grow faster than females, and therefore, reach larger sizes by harvest time. Histological observations have indicated that the sex-differentiation sensitive period (which includes the formation of the androgenic gland, the testis, and the ovary) is from post-larvae (PL) developmental stage for M. nipponense. In this study, we prepared four microRNA (miRNA) and mRNA libraries using samples collected from sex-differentiation sensitive period (PL7 to PL16) to perform RNA-sequencing for identifying sex-related candidate miRNAs, genes, and metabolic pathways...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28931720/ph-control-in-the-midgut-of-aedesaegypti-under-different-nutritional-conditions
#15
Denise Barguil Nepomuceno, Vânia Cristina Santos, Ricardo Nascimento Araújo, Marcos Horácio Pereira, Maurício Roberto Sant'Anna, Luciano Andrade Moreira, Nelder Figueiredo Gontijo
Aedes aegypti is one of the most important disease vectors in the world. Because their gut is the first site of interaction with pathogens, it is important to understand A. aegypti gut physiology. In this study, we investigated the mechanisms of pH control in the midgut of A. aegypti females under different nutritional conditions. We found that unfed females have an acidic midgut (pH ∼6). The midgut of unfed insects is actively maintained at pH 6 regardless of the ingestion of either alkaline or acidic buffered solutions...
September 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28931416/social-disparities-in-food-preparation-behaviours-a-dedipac-study
#16
Caroline Méjean, Wendy Si Hassen, Séverine Gojard, Pauline Ducrot, Aurélie Lampuré, Hans Brug, Nanna Lien, Mary Nicolaou, Michelle Holdsworth, Laura Terragni, Serge Hercberg, Katia Castetbon
BACKGROUND: The specific role of major socio-economic indicators in influencing food preparation behaviours could reveal distinct socio-economic patterns, thus enabling mechanisms to be understood that contribute to social inequalities in health. This study investigated whether there was an independent association of each socio-economic indicator (education, occupation, income) with food preparation behaviours. METHODS: A total of 62,373 adults participating in the web-based NutriNet-Santé cohort study were included in our cross-sectional analyses...
September 20, 2017: Nutrition Journal
https://www.readbyqxmd.com/read/28931275/hempseed-peptides-exert-hypocholesterolemic-effects-with-a-statin-like-mechanism
#17
Chiara Zanoni, Gilda Aiello, Anna Arnoldi, Carmen Lammi
This study had the objective of preparing a hempseed protein hydrolysate and investigating its hypocholesterolemic properties. The hydrolysate was prepared treating a total protein extract with pepsin. Nano HPLC-ESI-MS/MS analysis permitted identifying in total 90 peptides belonging to 33 proteins. In the range 0.1-1.0 mg/mL, it inhibited the catalytic activity of 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMGCoAR) in a dose-dependent manner. HepG2 cells were treated with 0.25, 0.5, and 1.0 mg/mL of the hydrolysate...
September 20, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28930870/hamstring-myoelectrical-activity-during-three-different-kettlebell-swing-exercises
#18
Michael J Del Monte, David A Opar, Ryan G Timmins, James Ross, Justin Wl Keogh, Christian Lorenzen
Kettlebell exercises have become an increasingly popular form of resistance training and component of lower body rehabilitative training programs; despite a lack of scientific literature illustrating internal mechanisms and effectiveness of these approaches. Participants (n=14) performed three different styles of kettlebell swings (hip hinge, squat and double knee extension) and were assessed for medial hamstrings (MH) and biceps femoris (BF) myoelectrical activity via surface electromyography (sEMG). Bipolar pre-gelled Ag/AgCl surface electromyography (sEMG) electrodes (10mm diameter, 20mm inter-electrode distance) were placed on the participant's dominant limb after correct skin preparation...
September 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28930448/direct-observation-of-oxygen-rebound-with-an-iron-hydroxide-complex
#19
Jan Paulo T Zaragoza, Timothy H Yosca, Maxime A Siegler, Pierre Moënne-Loccoz, Michael T Green, David P Goldberg
The rebound mechanism for alkane hydroxylation was invoked over 40 years ago to help explain reactivity patterns in cytochrome P450, and subsequently has been used to provide insight into a range of biological and synthetic systems. Efforts to model the rebound reaction in a synthetic system have been unsuccessful, in part because of the challenge in preparing a suitable metal-hydroxide complex at the correct oxidation level. Herein we report the synthesis of such a complex. The reaction of this species with a series of substituted radicals allows for the direct interrogation of the rebound process, providing insight into this uniformly invoked, but previously unobserved process...
September 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28930358/fabrication-and-characterization-of-a-3d-bioprinted-nanoparticle-hydrogel-hybrid-device-for-biomimetic-detoxification
#20
Maggie S Chen, Yue Zhang, Liangfang Zhang
A biomimetic micro/nanodevice is 3D bioprinted using polyethylene glycol (PEG) hydrogel as the supporting platform, along with the red blood cell (RBC) membrane-coated nanoparticles (RBC-NPs) encapsulated in the hydrogel as the detoxification mechanism. RBC-NPs are prepared through a nanoprecipitation and coating method and then mixed into the poly(ethylene glycol) diacrylate (PEGDA) monomer solution for 3D bioprinting through photopolymerization. This resulting detoxification device is engineered with multiple inner channels for the RBC-NPs to nonspecifically soak up the various toxins flowing through the channels...
September 20, 2017: Nanoscale
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