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https://www.readbyqxmd.com/read/28088115/in-situ-synthesis-of-novel-z-scheme-sns2-biobr-photocatalysts-with-superior-photocatalytic-efficiency-under-visible-light
#1
Fazheng Qiu, Wenjun Li, Fangzhi Wang, Hongda Li, Xintong Liu, Jiayi Sun
In this study, a novel SnS2/BiOBr heterojunction photocatalyst was synthesized via a facile in-situ growth strategy. The heterojunction interface was formed by loading BiOBr nanosheets on the surface of ultrathin hexagonal SnS2 nanoplates. UV/Vis diffuse reflectance spectroscopy (DRS) indicated that SnS2/BiOBr composites possessed stronger visible-light absorption. The as-fabricated SnS2/BiOBr heterojunction nanoplates exhibited considerable improvement in terms of photocatalytic activity for the degradation of rhodamine B (RhB) under visible light irradiation as compared with BiOBr and SnS2...
December 30, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088106/uv-a-induced-delayed-development-in-the-larvae-of-coral-seriatopora-caliendrum
#2
Jie Zhou, Tung-Yung Fan, John Beardall, Kunshan Gao
Coral reefs are vulnerable to ultraviolet radiation (UVR, 280-400nm). Not only do the fluxes of UVR fluctuate daily, they are also increasing due to global ocean and atmospheric changes. The deleterious effects of UVR on scleractinian corals have been intensively studied, but much less is known about the response of corals in the early pre-settlement phase. In this study, we tested how UVR exposure affects survival and development of Seriatopora caliendrum larvae and examined the photophysiological changes induced in the symbiotic dinoflagellate Symbiodinium...
January 4, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28088104/biofabrication-of-size-controllable-silver-nanoparticles-a-green-approach
#3
Sireesh Babu Maddinedi, Badal Kumar Mandal, Swetha Kameswari Maddili
A facile biosynthetic approach for the size controllable production of silver nanoparticles (AgNPs) using the leaf extract of Cinnamomum tsoi as reducing and capping agent is developed. The polyphenolic functionalities present in the extract are essentially responsible for the synthesis and stabilization of AgNPs. The size and morphology of the AgNPs were effectively tuned by changing the volume of the extract. The availability of oxidized polyphenols play key role in tuning the size and morphology of the prepared NPs...
January 7, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28088102/effects-of-photoperiod-regimes-and-ultraviolet-c-radiations-on-biosynthesis-of-industrially-important-lignans-and-neolignans-in-cell-cultures-of-linum-usitatissimum-l-flax
#4
Sumaira Anjum, Bilal Haider Abbasi, Joël Doussot, Alain Favre-Réguillon, Christophe Hano
Lignans and neolignans are principal bioactive components of Linum usitatissimum L. (Flax), having multiple pharmacological activities. In present study, we are reporting an authoritative abiotic elicitation strategy of photoperiod regimes along with UV-C radiations. Cell cultures were grown in different photoperiod regimes (24h-dark, 24h-light and 16L/8D h photoperiod) either alone or in combination with various doses (1.8-10.8kJ/m(2)) of ultraviolet-C (UV-C) radiations. Secoisolariciresinol diglucoside (SDG), lariciresinol diglucoside (LDG), dehydrodiconiferyl alcohol glucoside (DCG), and guaiacylglycerol-β-coniferyl alcohol ether glucoside (GGCG) were quantified by using reverse phase-high performance liquid chromatography (RP-HPLC)...
January 7, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28088043/hplc-uv-method-for-simultaneous-determination-of-mk-1775-and-azd-7762-in-both-acetonitrile-aqueous-solution-and-mouse-plasma
#5
REVIEW
Kareem Ebeid, Giang N Ho, Aliasger K Salem
A sensitive and precise method is described for the simultaneous determination of two small molecule kinase inhibitors: MK-1775 (MK) and AZD-7762 (AZD), in acetonitrile (ACN)-aqueous solution and in mouse plasma. A Nova-Pak C18 reversed phase column (3.9mm×150mm, 4μm, 60Å) was utilized in the separation using an isocratic mobile phase of 0.1% v/v triethylamine in phosphate buffer (pH=7.4): acetonitrile (ACN) (60:40, v/v), at a flow rate of 0.8mL/min. Detection wavelength was set at 310nm for both MK and AZD, and 431nm for the internal standard sunitinib (SUN)...
December 30, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28088024/multi-year-record-of-atmospheric-and-snow-surface-nitrate-in-the-central-antarctic-plateau
#6
R Traversi, S Becagli, M Brogioni, L Caiazzo, V Ciardini, F Giardi, M Legrand, G Macelloni, B Petkov, S Preunkert, C Scarchilli, M Severi, V Vitale, R Udisti
Continuous all year-round samplings of atmospheric aerosol and surface snow at high (daily to 4-day) resolution were carried out at Dome C since 2004-05 to 2013 and nitrate records are here presented. Basing on a larger statistical data set than previous studies, results confirm that nitrate seasonal pattern is characterized by maxima during austral summer for both aerosol and surface snow, occurring in-phase with solar UV irradiance. This temporal pattern is likely due to a combination of nitrate sources and post-depositional processes whose intensity usually enhances during the summer...
December 30, 2016: Chemosphere
https://www.readbyqxmd.com/read/28088012/new-4-4-chlorophenyl-2-2-6-2%C3%A2-terpyridine-ruthenium-ii-complexes-synthesis-characterization-interaction-with-dna-bsa-and-cytotoxicity-studies
#7
Milan M Milutinović, Ana Rilak, Ioannis Bratsos, Olivera Klisurić, Milan Vraneš, Nevenka Gligorijević, Siniša Radulović, Živadin D Bugarčić
In this study, we have developed a series of new monofunctional Ru(II) complexes of the general formula mer-[Ru(Cl-Ph-tpy)(N-N)Cl]Cl in which Cl-Ph-tpy is 4'-(4-chlorophenyl)-2,2':6',2″-terpyridine, N-N is a bidentate chelating ligand (1,2-diaminoethane (en, 1), 1,2-diaminocyclohexane (dach, 2) or 2,2'-bipyridine (bpy, 3)). All complexes were fully characterized by elemental analysis and spectroscopic techniques (IR, UV-Vis, 1D and 2D NMR). Their chemical behavior in aqueous solution was studied by UV-Vis and NMR spectroscopy showing that all compounds are relatively labile leading to the formation of the corresponding aqua species 1aq-3aq...
October 14, 2016: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28087976/the-role-of-diode-array-ultraviolet-detection-for-the-identification-of-synthetic-cathinones
#8
Walter F Rowe, Ioan Marginean, Stephanie Carnes, Ira S Lurie
The utility of diode array UV detection for aiding in the identification of synthetic cathinones, including different sub classes and positional isomers is presented. For 35 synthetic cathinones' unique UV spectra are obtained for seven sub classes including mostly beta ketones, where position and type of substitution on benzene rings give rise to differences in UV maxima and relative intensity of the spectral bands. This aspect is key to distinguishing positional isomers which contain differences in R substitution (mono and di) around the benzene ring, which provides complementary information to electron ionization mass spectrometry, where the latter technique cannot distinguish between these types of positional isomers...
January 14, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28087932/the-complexity-of-fungal-vision
#9
Reinhard Fischer, Jesus Aguirre, Alfredo Herrera-Estrella, Luis M Corrochano
Life, as we know it, would not be possible without light. Light is not only a primary source of energy, but also an important source of information for many organisms. To sense light, only a few photoreceptor systems have developed during evolution. They are all based on an organic molecule with conjugated double bonds that allows energy transfer from visible (or UV) light to its cognate protein to translate the primary physical photoresponse to cell-biological actions. The three main classes of receptors are flavin-based blue-light, retinal-based green-light (such as rhodopsin), and linear tetrapyrrole-based red-light sensors...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087893/brompheniramine-as-a-novel-probe-for-indirect-uv-detection-and-its-application-for-the-capillary-electrophoresis-of-adamantane-drugs
#10
Pornpan Prapatpong, Brompoj Prutthiwanasan, Nantana Nuchtavorn, Sawanya Buranaphalin, Leena Suntornsuk
Brompheniramine, an antihistamine drug, was employed as a novel UV probe for capillary electrophoresis with indirect UV detection of adamantane drugs (memantine, amantadine, and rimantadine). The probe possesses high molar absorptivity of 24 × 10(3) L/mol cm at 6 mM, which enables the measurement of these non-chromophore analytes without derivatization. The simple background electrolyte (10 mM sodium dihydrogen phosphate (pH 5.0) containing 5 mM brompheniramine and 6 mM β-cyclodextrin) provided the separation of the analytes in a short time (7...
January 14, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28087479/synthesis-and-characterization-of-gold-nanostructured-chorin-e6-for-photodynamic-therapy
#11
L Vieira, M L Castilho, I Ferreira, J Ferreira-Strixino, K C Hewitt, L Raniero
Photodynamic therapy is an alternative treatment for cancer based on cellular uptake of a photosensitizer, illuminated with an appropriate wavelength in the presence of oxygen. A cascade of reactions generates reactive oxygen species leading to cell death. Using carbodiimide chemistry, chlorin e6 (Ce6) was covalently bonded to thiourea, and (via the sulphur end group) to gold nanoparticles (AuNPs), forming the Ce6-AuNP complex. Ce6 absorbs in the range 650-680nm, where the coefficient of biological tissue absorption is low (part of the therapeutic window), which is ideal for biological application...
January 10, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28087425/variations-of-metabolites-and-proteome-in-lonicera-japonica-thunb-buds-and-flowers-under-uv-radiation
#12
Wei Zhu, Wen Zheng, Xingjiang Hu, Xiaobao Xu, Lin Zhang, Jingkui Tian
Lonicera japonica Thunb., also known as Jin Yin Hua and Japanese honeysuckle, is used as a herbal medicine in Asian countries. Its flowers have been used in folk medicine in the clinic and in making food or healthy beverages for over 1500years in China. To investigate the molecular processes involved in L. japonica development from buds to flowers exposed to UV radiation, a comparative proteomics analysis was performed. Fifty-four proteins were identified as differentially expressed, including 42 that had increased expression and 12 that had decreased expression...
January 10, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28087152/corrigendum-to-numerical-study-of-the-effects-of-lamp-configuration-and-reactor-wall-roughness-in-an-open-channel-water-disinfection-uv-reactor-chemosphere-155-2016-170-179
#13
https://www.readbyqxmd.com/read/28081493/optical-and-vibrational-properties-of-phosphorylcholine-based-contact-lenses-experimental-and-theoretical-investigations
#14
Katarzyna Filipecka, Rafał Miedziński, Maciej Sitarz, Jacek Filipecki, Małgorzata Makowska-Janusik
The Raman, MIR and UV-vis spectroscopy have been used to characterize Omafilcon A material constructing the one of the Proclear family contact lenses. The Omafilcon A is hydrogel material composed of 2-hydroxyethyl methacrylate (HEMA) and 2-methacryloyloxyethyl phosphorylcholine (PC) polymers crosslinked with ethyleneglycol dimethacrylate (EGDMA). Vibrational and electronic properties of the Omafilcon A material were also investigated by quantum chemical calculations. Experimentally obtained Raman, MIR and optical spectra were compared to the theoretical ones calculated applying RHF and DFT methodology...
January 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28081492/hassle-free-synthesis-of-nanodimensional-ni-cu-and-zn-sulfides-for-spectral-sensing-of-hg-cd-and-pb-a-comparative-study
#15
Zarina Ansari, Shib Shankar Singha, Abhijit Saha, Kamalika Sen
A simple room temperature synthesis method of Ni, Cu and Zn sulfide nanoparticles (NPs) in aqueous medium is reported here. The NPs stabilized in aqueous medium by the citrate ions were characterized by UV-vis, ζ potentials, TEM and Raman spectroscopic techniques. The solid NPs could be isolated from the aqueous medium when allowed to stand for a prolonged time (~20h). The solids were also characterized by IR and powder X-ray analysis. The nanoparticles were further used for the development of facile optical sensing and detection of heavy metal ions at trace scale...
January 4, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28081483/enhanced-visible-light-driven-photocatalytic-bacteria-disinfection-by-g-c3n4-agbr
#16
Jun Deng, Jialiang Liang, Mian Li, Meiping Tong
g-C3N4-AgBr was synthesized by depositing AgBr nanoparticles onto g-C3N4. Scanning electron microscopy (SEM), Transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (DRS) and Photoluminescence (PL) spectra were employed to characterize the as-synthesized photocatalysts. The disinfection activities towards representative Gram-negative strain E. coli and Gram-positive strain S. aureus were examined under visible light irradiation...
January 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28081356/canna-edulis-leaf-extract-mediated-preparation-of-stabilized-silver-nanoparticles-characterization-antimicrobial-activity-and-toxicity-studies
#17
S V Otari, S H Pawar, Sanjay K S Patel, Raushan K Singh, Sang-Yong Kim, Jai Hyo Lee, Liaoyuan Zhang, Jung-Kul Lee
A novel approach to synthesize silver nanoparticles (AgNPs) using leaf extract of Canna edulis Ker-Gawl. (CELE) under ambient conditions is reported here. The as-prepared AgNPs were analyzed by UV-visible spectroscopy, transmission emission microscopy, X-ray diffraction, Fourier transform-infra red spectroscopy, energy-dispersive analysis of X-ray spectroscopy, zeta potential, and dynamic light scattering. The AgNPs showed excellent antimicrobial activity against various pathogens, including bacteria and various fungi...
January 12, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28081071/small-period-long-period-fiber-grating-with-improved-refractive-index-sensitivity-and-dual-parameter-sensing-ability
#18
Fangcheng Shen, Changle Wang, Zhongyuan Sun, Kaiming Zhou, Lin Zhang, Xuewen Shu
We UV inscribe and characterize a long-period fiber grating with a period of 25 μm. A series of polarization-dependent dual-peak pairs can be seen in the transmission spectrum, even though only the symmetrical refractive index modification is introduced. The fabricated grating exhibits a lower temperature sensitivity compared with standard long-period gratings and an enhanced refractive index sensitivity of ∼312.5  nm/RIU averaged from 1.315 to 1.395, which is more than four-fold higher than standard long-period gratings in this range...
January 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28080061/evaluation-of-a-new-biosensor-based-on-in-situ-synthesized-ppy-ag-pvp-nanohybrid-for-selective-detection-of-dopamine
#19
Balakumar Vellaichamy, Prakash Periakaruppan, Tharmaraj Paulmony
In the present work, in-situ synthesis of polypyrrole-silver-polyvinylpyrrolidone (PPy-Ag-PVP) nonohybrid using AgNO3 as an oxidant and polyvinyl pyrrolidone (PVP) as a stabilizer and surfactant is demonstrated. The obtained ternary PPy-Ag-PVP nanohybrid was characterized by UV-vis, FT-IR, XRD, Raman, TGA, SEM and HR-TEM analysis. Further the synthesized PPy-Ag-PVP has been investigated for its selective and sensitive sensing of dopamine (DA). The PPy-Ag-PVP modified glassy carbon electrode shows a reversible electrochemical behavior with superior response for DA...
January 12, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28080038/tracking-catalyst-redox-states-and-reaction-dynamics-in-ni-fe-oxyhydroxide-oxygen-evolution-reaction-oer-electrocatalysts-the-role-of-catalyst-support-and-electrolyte-ph
#20
Mikaela Goerlin, Jorge Ferreira de Araújo, Henrike Schmies, Denis Bernsmeier, Soeren Dresp, Manuel Gliech, Zenonas Jusys, Petko Chernev, Ralph Kraehnert, Holger Dau, Peter Strasser
Ni-Fe oxyhydroxides are the most active known electrocatalysts for the oxygen evolution reaction (OER) in alkaline electrolytes and are therefore of great scientific and technological importance in the context of electrochemical energy conversion. Here we uncover, investigate, and discuss previously unaddressed effects of conductive supports and the electrolyte pH on the Ni-Fe oxide catalyst redox behavior and catalytic OER activity, combining operando UV-vis spectro-electrochemistry, operando electrochemical mass spectrometry (DEMS), and in-situ cryo X-ray absorption spectroscopy (XAS)...
January 12, 2017: Journal of the American Chemical Society
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