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Henry Zúñiga-Benítez, Gustavo A Peñuela
Benzophenones (BPs) family is one of the most frequently used groups of UV-filters. However, it has been reported by different authors that this kind of chemical compounds could be associated with some endocrine disrupting activity, genotoxicity and reproductive toxicity. In addition, different studies have evidenced the presence of BPs in several environmental matrices, indicating that conventional technologies of water treatment are not able to remove them, which generates the necessity of evaluating new alternatives of remediation...
April 18, 2018: Journal of Environmental Management
Sreeja Nair, Giridhar B Nagarajappa, Krishna K Pandey
Nanoparticles of some of the metal oxides are known to have high UV protective efficiency. The UV filtering efficiency of nanoparticles invariably depends on their size and stability in the dispersion. In the present work, a stable dispersion of nanoparticles of three metal oxides, zinc oxide (ZnO), cerium oxide (CeO2 ) and titanium dioxide (TiO2 ), was prepared in propylene glycol (PG) using ultrasonication. The method is easy and useful as no additional surfactant or dispersant is needed. The particle size and its distribution was confirmed by Scanning Electron Microscopy and Dynamic Light Scattering...
April 12, 2018: Journal of Photochemistry and Photobiology. B, Biology
Tomasz J Merta, Nicholas E Geacintov, Vladimir Shafirovich
The mechanistic aspects of one-electron oxidation of G-quadruplexes in the basket (Na+ ions) and hybrid (K+ ions) conformations were investigated by transient absorption laser kinetic spectroscopy and HPLC detection of the 8-oxo-7,8-dihydroguanine (8-oxoG) oxidation product. The photo-induced one-electron abstraction from G-quadruplexes was initiated by sulfate radical anions (SO4 •- ) derived from the photolysis of persulfate ions by 308 nm excimer laser pulses. In neutral aqueous solutions (pH 7.0), the transient absorbance of neutral guanine radicals, G(-H)• is observed following the complete decay of SO4 •- radicals (~10 μs after the actinic laser flash)...
April 21, 2018: Photochemistry and Photobiology
Michele Board, Brendan McCormack
AIMS AND OBJECTIVES: To explore the meaning of home for six baby boomers and consider how this insight can be used when caring for older people in hospital or residential settings. BACKGROUND: Feeling at home is important to help retain a sense of autonomy, security and well-being, but home is a complex concept to understand. The baby boomers are a large cohort entering later life and understanding their sense of home is not only an example of anticipatory gerontology but it could also provide the tools to explore home with the current older population, who may be in a variety of care settings...
April 20, 2018: Journal of Clinical Nursing
Claudio Iacobucci, Christine Piotrowski, Anne Rehkamp, Christian H Ihling, Andrea Sinz
Cleavable cross-linkers are gaining increasing importance for chemical cross-linking/mass spectrometry (MS) as they permit a reliable and automated data analysis in structural studies of proteins and protein assemblies. Here, we introduce 1,3-diallylurea (DAU) as the first CID-MS/MS-cleavable, photo-thiol-reactive cross-linker. DAU is a commercially available, inexpensive reagent that efficiently undergoes an anti-Markovnikov hydrothiolation with cysteine residues in the presence of a radical initiator upon UV-A irradiation...
April 20, 2018: Journal of the American Society for Mass Spectrometry
Leandro O Conte, Agustina V Schenone, Bárbara N Giménez, Orlando M Alfano
The effects of four inorganic anions (Cl- , SO4 2 -, HCO3 - , NO3 - ) usually present in groundwater were investigated on the photo-Fenton degradation of 2,4-dichlorophenoxyacetic acid (2,4-D). A kinetic model derived from a reaction sequence is proposed using the ferrioxalate complex as iron source at pH close to natural conditions (pH = 5). It was demonstrated that oxalate not only maintained iron in solution for the natural groundwater system, but also increased the photochemical activation of the process...
April 5, 2018: Journal of Hazardous Materials
Bowen Shan, Jung Hyun Kim, Wonseok Choi
In this study, a functional coating technology to improve the anti-fouling properties of the photo-voltaic module is introduced. The coating was applied on the cover glass, which is the same material as the photovoltaic module. After coating the cover glass once, twice, and three times in the horizontal and vertical directions respectively, the anti-fouling properties was tested according to the coating times and the thickness of the coating film. To ensure the durability of the coating film, the annealing process was performed for 1 hour at 200 °C in a furnace after coating...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Duck Hyun Kim, Min Jae Lee, A-Young Sung
HPMA (hydroxypropyl methacrylate) and Bis-GMA (bisphenol A glycerolate dimethacrylate), the main ingredients, and styrene, TEGDMA (triethylene glycol dimethacrylate), BPO (benzoyl peroxide) and camphoroquinone, the photo-initiators, and BHT (butylated hydroxytoluene), the photocatalyst were mixed by different ratios and stirred to investigate the compatibility of dental materials with photoinitiators. The degree of polymerization was checked and determination of the most ideal ratio for photopolymerization was followed by establishing the basic combination of styrene, HPMA, Bis-GMA, BHT, TEGDMA and HEMA...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Jong-Woon Ha, Hea Jung Park, Junhoo Park, Inwon Lee, Hyun Park, Hoyoul Kong, Jong Mok Park, Do-Hoon Hwang
A series of polystyrene (PS) copolymers containing 2,3,4,5,6-pentafluorostyrene units with different monomer ratios were prepared for antifouling applications. PS, poly(styrene-co-pentafluorostyrene) (poly(S-co-FS)), and poly(pentafluorostyrene) (PFS) were synthesized by free-radical polymerization and characterized by 1H NMR, Fourier-transform infrared spectroscopy, and gel permeation chromatography. The surface energy of the polymer films decreased with increasing content of fluorinated styrene. Protein adsorption experiments were carried out on the synthesized polymer films using fluorescein isothiocyanate-labeled bovine serum albumin as a fluorescent protein...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Jinhwan Kim, Jae-Hoon Ji, Gae-Hun Jo, Sung-Wook Min, Jung-Hyuk Koh
Laser direct patterning (LDP) technology has attracted great attention due to its process simplification and environmental friendliness. It is replacing the existing photo-lithography technology. Infrared (IR) laser equipment also has advantages such as low cost and long duration, although it is difficult to implement fine line width compared to ultraviolet (UV) or excimer laser. Therefore, it is very important to realize 3-D patterning system based on cheap infrared laser system. In this paper, 3-D infrared laser direct patterning system was designed by introducing an etching process on Ag paste/ITO/PET flexible film...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Kyeong-Keun Choi, Jeong-Yoon Lee, Won-Beom Lee, Deok-Kee Kim, Chan-Gyung Park
Radio-frequency plasma enhanced CVD (RF-PECVD) carbon films were grown directly on 4-inch 4H-SiC substrates as a capping layer for MOSFET device applications. An approximately 50-nm-thick CVD carbon capping layer was found to reduce the surface roughness, as determined by atomic force microscopy (AFM). The secondary ion mass spectroscopy (SIMS) depth profile results revealed that carbon capping layer can suppress the dopant out-diffusion on the implanted surface after annealing even at high temperature (1700 °C) for 30 min...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Jinsuo Gao, Shouchun Wu, Yanling Han, Feng Tan, Yong Shi, Mengyao Liu, Xinyong Li
Increasing the amount of surface active sites of the material may be a feasible way to improve the efficiency ofthe generation of Fe2+ in the photo-Fenton process. In this work, a simple synthesis method was adopted to synthesize 3D ordered mesoporous CuFe2 O4 with large specific surface areaby using ferric nitrate and copper nitrate as the precursor and KIT-6 as the template. The synthesized materials were characterized by nitrogen adsorption-desorption, XRD, TEM, FT-IR and UV-vis DRS. The catalytic properties of the mesoporous material were thoroughly evaluated by activating hydrogen peroxide to remove sulfonamides in near neutral water...
April 1, 2018: Journal of Colloid and Interface Science
Santhosh Kalash Rajendrakumar, Saji Uthaman, Chong Su Cho, In-Kyu Park
Immune system evasion by cancer cells is one of the hallmarks of cancers, and it occurs with the support of tumor-associated immune cells (TICs) in the tumor microenvironment that increase the growth and invasiveness of tumor cells. With recent advancements in the development of novel near infrared (NIR)-responsive nanoparticles, specifically eradicating TICs or inducing an inflammatory immune response by activating killer T cells has become possible. This review will discuss the mechanisms and applications of photo-triggered immunotherapy in detail...
April 20, 2018: Biomacromolecules
Tadanobu Nagaya, Shuhei Okuyama, Fusa Ogata, Yasuhiro Maruoka, Peter L Choyke, Hisataka Kobayashi
Near infrared photoimmunotherapy (NIR-PIT) is a highly selective tumor treatment that employs an antibody-photo-absorber conjugate (APC) which is activated by near infrared light. Here, we describe the efficacy of endoscopic NIR-PIT using the APC trastuzumab-IR700DX (tra-IR700) in the setting of human epidermal growth factor 2 positive (HER2+) gastric carcinoma with peritoneal disseminations. In this in vivo study, fluorescence endoscopy showed high tumor accumulation of tra-IR700 within disseminated peritoneal implants...
April 20, 2018: Cancer Science
Ivan Maisuls, Franco Cabrerizo, Pedro David Gara, Bernd Epe, Gustavo Teodosio Ruiz
Re(I)-polypyridyl complexes show quite interesting and distinctive photochemical and photosensitizing properties. This work describes the capability to induce (or photoinduce) DNA damage of three Re(I)-complexes with a naturally occurring alkaloid called norharmane (nHo) as ligand: [Re(CO)3(nHo)(L)]CF3SO3 where L = 2,2´-bipyridine (ReBpy), phenanthroline (RePhen) or dipyrido[3,2-a:2',3'-c]phenazine (ReDppz). The interaction of the complexes with DNA was investigated by steady-state and time-resolved spectroscopy...
April 19, 2018: Chemistry: a European Journal
M A Peck, G R Hearne, C Obuah, J Darkwa
57Fe Mössbauer spectroscopy has been used to study electronic dispersions in complexes of Fe, Co, Ni and Pd anchored onto 3-ferrocenyl-5-methylpyrazolylmethylenepyridine and 3-ferrocenylpyrazolylmethylenepyridine ligands. Mössbauer spectroscopy shows that pyrazolyl-derivatizing of ferrocene increases the electron-density at the Fe-centre as well as facilitating the Fe to cyclopentadienyl ring back-donation of electron-density. The coordination of the ferrocenyl-pyrazolyl ligand to transition metals such as Fe, Co, Ni and Pd reduces the electron-density at the Fe-centre of the ferrocenyl moiety while increasing the electron-density at the coordinated metal centre, especially in the Fe complexes...
April 20, 2018: Physical Chemistry Chemical Physics: PCCP
Xia Hu, Guoting Zhang, Faxiang Bu, Xu Luo, Kebing Yi, Heng Zhang, Aiwen Lei
The dehydrogenative cross-coupling of arenes and alkenes is a particularly ideal approach for the synthesis of aryl alkenes. Herein, we report a photo-induced C-H/C-H cross-coupling between electron-rich arenes and styrene derivatives using a dual catalytic system containing an acridinium photosensitizer and a cobaloxime proton-reducing catalyst. This catalytic system enables the Csp2 -Csp2 bond formation accompanying H2 evolution. Various substituted aryl alkenes can be afforded with good to excellent yields and high β-regioselectivity...
February 14, 2018: Chemical Science
Ladislav Černý, Marco A Bologna
Diaphorocera neglecta sp. n. from Morocco is described. Photos of the new species are provided and male features are figured. The new species has intermediate characters between the groups of D. hemprichi and D. promelaena as defined in the literature. These groups are discussed and a new key to the species is presented.
2018: ZooKeys
Sybill K Amelon, Sarah E Hooper, Kathryn M Womack
The ability to recognize individuals within an animal population is fundamental to conservation and management. Identification of individual bats has relied on artificial marking techniques that may negatively affect the survival and alter the behavior of individuals. Biometric systems use biological characteristics to identify individuals. The field of animal biometrics has expanded to include recognition of individuals based upon various morphologies and phenotypic variations including pelage patterns, tail flukes, and whisker arrangement...
May 29, 2017: Journal of Mammalogy
Mariana Neamtu, Claudia Nadejde, Vasile-Dan Hodoroaba, Rudolf J Schneider, Liliana Verestiuc, Ulrich Panne
Cost-effective water cleaning approaches using improved treatment technologies, for instance based on catalytic processes with high activity catalysts, are urgently needed. The aim of our study was to synthesize efficient Fenton-like photo-catalysts for rapid degradation of persistent organic micropollutants in aqueous medium. Iron-based nanomaterials were chemically synthesized through simple procedures by immobilization of either iron(II) oxalate (FeO) or iron(III) citrate (FeC) on magnetite (M) nanoparticles stabilized with polyethylene glycol (PEG)...
April 19, 2018: Scientific Reports
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