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Teng-Sing Wei, Bok Yeop Ahn, Julia Grotto, Jennifer A Lewis
The growing demand for rechargeable lithium-ion batteries (LIBs) with higher capacity in customized geometries underscores the need for new battery materials, architectures, and assembly strategies. Here, the design, fabrication, and electrochemical performance of fully 3D printed LIBs composed of thick semisolid electrodes that exhibit high areal capacity are reported. Specifically, semisolid cathode and anode inks, as well as UV curable packaging and separator inks for direct writing of LIBs in arbitrary geometries are created...
March 15, 2018: Advanced Materials
Anna Baldisserotto, Piergiacomo Buso, Matteo Radice, Valeria Dissette, Ilaria Lampronti, Roberto Gambari, Stefano Manfredini, Silvia Vertuani
Moringa oleifera has gained increasing popularity as a food supplement but not in the pharmaceutical and cosmetic area. The aim of this study was the preparation, characterization, and evaluation of extracts from the leaves of Moringa oleifera as a herbal sun care phytocomplex. Three different extracts of Moringa oleifera leaves, from Senegal, have been prepared and chemically characterized in the phenolic fraction by HPLC-DAD and Folin-Ciocalteu test. To explore photoprotective properties, an extensive evaluation of UV filtering, antioxidant (DPPH, FRAP, ORAC, PCL), and anti-hyperproliferative (human melanoma Colo38 cells) capacities have been conducted...
March 15, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Andreu Presa, Guillem Vázquez, Leoní A Barrios, Olivier Roubeau, Luís Korrodi-Gregório, Ricardo Pérez-Tomás, Patrick Gamez
The development of photoactivatable metal complexes with potential anticancer properties is a topical area of current investigation. Photoactivated chemotherapy using coordination compounds is typically based on photochemical processes occurring at the metal center. In the present study, an innovative approach is applied that takes advantage of the remarkable photochemical properties of diarylethenes. Following a proof-of-concept study with two complexes, namely, C1 and C2, a series of additional platinum(II) complexes from dithienylcyclopentene-based ligands was designed and prepared...
March 15, 2018: Inorganic Chemistry
Ayrat Dimiev, Vadim Neklyudov, Vera Agieienko, Marat Ziganshin
The self-association and solvation pattern of graphene oxide (GO) in water, ethylene glycol (EG) and their mixtures were analyzed by means of UV-Vis spectrophotometry. A careful analysis of the absorbance dependencies vs. the GO concentration shows that self-association of the GO sheets in EG occurs at higher concentration compared to that in water. It was established that depending on the mixed solvent composition two different types of the GO solvates are formed. The results of quantum chemical calculations allow one to suggest that in the water-rich compositions the GO oxygen containing groups are in direct contact with water molecules while in the glycol-rich media the EG molecules fully substitute water in the GO's first solvation layer...
March 15, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Shou-Fei Gao, Ying-Ying Wang, Wei Ding, Pu Wang
UV guiding fibers are highly sought after in laser and spectroscopy applications. Recent advances in hollow-core fiber orient a practical approach for proper UV light delivery sustainable to high-power and long-term irradiation. In this Letter, we report two types of hollow-core negative-curvature fibers (NCFs) in a UV spectral range. Their structures consist of one ring of six small (7.9 μm in diameter) and four big (20.8 μm in diameter) tubes, enclosing a hollow core of similar size (∼15  μm in diameter)...
March 15, 2018: Optics Letters
Fedor Rudakov, Joseph D Geiser, Peter M Weber
A technique for the spatially resolved and molecule-specific detection of chemical vapors is presented. The chemical specificity arises from a transient absorption spectrum where an ultraviolet (UV) pulse excites the molecule to a Rydberg state, and a near-infrared (NIR) or visible probe pulse records a transient absorption spectrum. By recording the NIR pulse reflected off a random, distant object and measuring the elapsed time between the emission of the UV pulse and the absorption of a counter-propagating NIR pulse, the distance to the absorber is obtained...
March 15, 2018: Optics Letters
Hao Huang, Xiaohui Ren, Zhongjun Li, Huide Wang, Zongyu Huang, Hui Qiao, Pinghua Tang, Jinlai Zhao, Weiyuan Liang, Yanqi Ge, Jie Liu, Jianqing Li, Xiang Qi, Han Zhang
Two dimensional (2D) Bi nano-sheets had been employed to fabricate electrodes for broadband photo-detection. A series of characterization techniques including SEM and HRTEM verify that Bi nanosheets with intact lamellar structure have been obtained after facile liquid phase exfoliation. In the meanwhile, UV-Vis and Raman spectra are also carried out and confirm the inherent optical and physical properties of Bi nanosheets. Inherited from the topological characteristics of Bi bulk counterpart, the resultant Bi nanosheet-based photo-detector exhibits preferable photo-response activity as well as environmental robustness...
March 15, 2018: Nanotechnology
J A Marozas, M Hohenberger, M J Rosenberg, D Turnbull, T J B Collins, P B Radha, P W McKenty, J D Zuegel, F J Marshall, S P Regan, T C Sangster, W Seka, E M Campbell, V N Goncharov, M W Bowers, J-M G Di Nicola, G Erbert, B J MacGowan, L J Pelz, S T Yang
Cross-beam energy transfer (CBET) results from two-beam energy exchange via seeded stimulated Brillouin scattering, which detrimentally reduces ablation pressure and implosion velocity in direct-drive inertial confinement fusion. Mitigating CBET is demonstrated for the first time in inertial-confinement implosions at the National Ignition Facility by detuning the laser-source wavelengths (±2.3  Å UV) of the interacting beams. We show that, in polar direct-drive, wavelength detuning increases the equatorial region velocity experimentally by 16% and alters the in-flight shell morphology...
February 23, 2018: Physical Review Letters
Shohei Kumagai, Shinya Takaishi, Mengqi Gao, Hiroaki Iguchi, Brian K Breedlove, Masahiro Yamashita
MX chains have been widely studied as a 1D mixed-valence system. Although there have been a large number of studies on the boundary between class II and III materials of the Robin-Day classification, there are few studies of compounds at the boundary between classes I and II. In this study, we synthesized a series of Pt- and Pd- MX-chain compounds with perrhenate counterions, [M(en)2 ][M(en)2 X2 ](ReO4 )4 (X = Br for M = Pd and X = Cl, Br, and I for M = Pt). All compounds were isostructural, and the metal-metal distances within the chain exceed 6 Å, which is the longest among MX-chain compounds thus far reported...
March 15, 2018: Inorganic Chemistry
Melissa P Woodard, Scott T Akin, Collin J Dibble, Michael A Duncan
Ultra-small chromium oxide nanoclusters produced by laser vaporization in a fast flowtube reactor are ligand-coated by gas phase reactions with acetonitrile vapor and then captured in a cold trap and transferred to solution. The resulting clusters are characterized with mass spectrometry, UV-visible absorption and emission, infrared spectroscopy, and surface-enhanced Raman spectroscopy (SERS). According to mass spectrometry, clusters of the form CrxOy(MeCN)z are produced in the size range of x  10 and y < 25...
March 15, 2018: Journal of Physical Chemistry. A
Jing Zhang, Xitao Liu, Xianfeng Li, Shiguo Han, Kewen Tao, Yuyin Wang, Chengmin Ji, Zhihua Sun, Junhua Luo
Organic-inorganic hybrid perovskites, with the formula ABX3 (A=organic cation, B=metal cation, and X=halide; for example, CH3 NH3 PbI3 ), have diverse and intriguing physical properties, such as semiconduction, phase transitions, and optical properties. Herein, a new ABX3 -type semiconducting perovskite-like hybrid, (hexamethyleneimine)PbBr3 (1), consisting of one-dimensional inorganic frameworks and cyclic organic cations, is reported. Notably, the inorganic moiety of 1 adopts a perovskite-like architecture and forms infinite columns composed of face-sharing PbBr6 octahedra...
March 15, 2018: Chemistry, An Asian Journal
Giacomo Reina, Ngoc Do Quyen Chau, Yuta Nishina, Alberto Bianco
Several studies have demonstrated the ability of graphene oxide (GO) to efficiently adsorb small-interfering RNA (siRNA) on its surface and to transport it into cells. However, studies on whether and how siRNA interacts with GO are still inconclusive. In this context, understanding the interaction between GO and siRNA is fundamental to design new efficient gene silencing tools. In this work, the interactions between GO and siRNA molecules were systematically investigated. We focused on how the GO size, oxygenated groups present on the surface and chemical functionalization affect the double helix siRNA structure, using gel electrophoresis, UV-Vis spectroscopy, fluorescence resonance energy transfer (FRET) and circular dichroism (CD)...
March 15, 2018: Nanoscale
Sulagna Patnaik, Gayatri Swain, K M Parida
Herein, a novel Cu-MoO3 /g-C3 N4 hybrid nanocomposite was successfully synthesized by a two-step strategy of one-pot pyrolysis followed by the impregnation method. The structure, phase, morphology and electronic environment of MoO3 , g-C3 N4 and Cu in the composite were determined by various characterization methods. The oxygen vacancies of MoO3 were ascertained by UV-DRS, Raman, and XPS analysis. The formation of the heterostructure was characterised by electrochemical measurements. The photocatalytic performance of the composite was investigated by the water reduction reaction and the reduction of an important inorganic pollutant, Cr(vi)...
March 15, 2018: Nanoscale
Motoki Kida, Mayuko Kubo, Tomoyuki Ujihira, Takayuki Ebata, Manabu Abe, Yoshiya Inokuchi
Observation of an excimer fluorescence in solution is proposed for detecting the encapsulation of potassium ion as opposed to other alkali ions by dibenzo-crown ethers. The scheme has been validated by ultraviolet photodissociation (UVPD) spectroscopy of dibenzo-21-crown-7 and dibenzo-24-crown-8 complexes with potassium ion, K+·DB21C7 and K+·DB24C8, performed under cold (~10 K) conditions in the gas phase and by quantum chemical calculations of the geometry and electronic structures of the complexes. Calculations suggest formation of a closely spaced excimer structure of benzene rings only for the K+·DB24C8...
March 15, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Neerupma Bhardwaj, Kirtimaan Syal, Dipankar Chatterji
ppGpp, an alarmone for stringent response, plays an important role in the reprogramming of the transcription complex at the time of stress. In Escherichia coli, ppGpp mediates its action by binding to at least two different sites on RNA polymerase (RNAP). One of the sites to which ppGpp binds to RNAP is at the β'-ω interface; however, the underlying molecular mechanism and the physiological relevance of ppGpp binding to this site remain unclear. In this study, we have performed UV cross-linking experiments using32 P azido-labeled ppGpp to probe its association with RNAP in the absence and presence of ω, and observed weaker binding of ppGpp to the RNAP without ω...
March 15, 2018: Genes to Cells: Devoted to Molecular & Cellular Mechanisms
Rainer Benndorf, Robert R Gilmont, Sahoko Hirano, Richard F Ransom, Peter R Jungblut, Martin Bommer, James E Goldman, Michael J Welsh
When analyzing small stress proteins of rat and human tissues by electrophoretic methods followed by western blotting, and using the anti-HspB1/anti-HspB5 antibody clone 8A7, we unexpectedly found a protein with a molecular mass of ~44 kDa. On two-dimensional gels, this protein resolved into four distinct species. Electrophoretic and immunological evidence suggests that this 44 kDa protein is a derivative of HspB5, most likely a covalently linked HspB5 dimer. This HspB5-like 44 kDa protein (HspB5L-P44) is particularly abundant in rat heart, brain, and renal cortex and glomeruli...
March 14, 2018: Cell Stress & Chaperones
S Kaiser, S V Radl, J Manhart, S Ayalur-Karunakaran, T Griesser, A Moser, C Ganser, C Teichert, W Kern, S Schlögl
The present work aims at the preparation of dry adhesives with switchable bonding properties by using the reversible nature of the [4πs+4πs] cycloaddition of anthracenes. Photo-responsive hydrogenated carboxylated nitrile butadiene rubber with photo-responsive pendant anthracene groups is prepared by one-pot synthesis. The formation of 3D networks relies on the photodimerization of the anthracene moieties upon UV exposure (λ > 300 nm). Controlled cleavage of the crosslink sites is achieved by either deep UV exposure (λ = 254 nm) or thermal dissociation at 70 °C...
March 15, 2018: Soft Matter
Ricardo Bisquert, Sara Muñiz-Calvo, José M Guillamón
Melatonin (Mel) is considered a potent natural antioxidant molecule given its free-radical scavenging ability. Its origin is traced back to the origin of aerobic life as early defense against oxidative stress and radiation. More complex signaling functions have been attributed to Mel as a result of evolution in different biological kingdoms, which comprise gene expression modulation, enzyme activity, and mitochondrial homeostasis regulation processes, among others. Since Mel production has been recently reported in wine yeast, we tested the protective effect of Mel on Saccharomyces cerevisiae against oxidative stress and UV light...
2018: Frontiers in Microbiology
Katarzyna Brach, Akiko Hatakeyama, Claude Nogues, Joanna Olesiak-Banska, Malcolm Buckle, Katarzyna Matczyszyn
The anisotropic shape of DNA molecules allows them to form lyotropic liquid crystals (LCs) at high concentrations. This liquid crystalline arrangement is also found in vivo (e.g., in bacteriophage capsids, bacteria or human sperm nuclei). However, the role of DNA liquid crystalline organization in living organisms still remains an open question. Here we show that in vitro, the DNA spatial structure is significantly changed in mesophases compared to non-organized DNA molecules. DNA LCs were prepared from pBluescript SK (pBSK) plasmid DNA and investigated by photochemical analysis of structural transitions (PhAST)...
March 14, 2018: Scientific Reports
Xingrong Peng, Xia Wang, Long Chen, Han Yang, Lei Li, Shuangyang Lu, Lin Zhou, Minghua Qiu
Ganoderma cochlear, as edible and medicinal fungus, has long been used to prevent and treat various diseases. As our continuously phytochemical investigation of this fungus, a HPLC-UV-guided method led to the isolation of nine previously undescribed aromatic meroterpenoids with different ring systems, including six pairs of racemates, (±)-cochlearins A-E, G (1-5, 7), and three new analogues, cochlearins F, H and I (6, 8, 9). Their structures were elucidated by extensive 1D, 2D NMR spectroscopic data and MS analyses...
March 11, 2018: Fitoterapia
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