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https://www.readbyqxmd.com/read/28212379/distribution-and-abundance-of-key-vectors-of-rift-valley-fever-and-other-arboviruses-in-two-ecologically-distinct-counties-in-kenya
#1
Rosemary Sang, Samwel Arum, Edith Chepkorir, Gladys Mosomtai, Caroline Tigoi, Faith Sigei, Olivia Wesula Lwande, Tobias Landmann, Hippolyte Affognon, Clas Ahlm, Magnus Evander
BACKGROUND: Rift Valley fever (RVF) is a mosquito-borne viral zoonosis of ruminants and humans that causes outbreaks in Africa and the Arabian Peninsula with significant public health and economic consequences. Humans become infected through mosquito bites and contact with infected livestock. The virus is maintained between outbreaks through vertically infected eggs of the primary vectors of Aedes species which emerge following rains with extensive flooding. Infected female mosquitoes initiate transmission among nearby animals, which amplifies virus, thereby infecting more mosquitoes and moving the virus beyond the initial point of emergence...
February 17, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28212020/a-new-reaction-pathway-induced-by-plasmon-for-selective-benzyl-alcohol-oxidation-on-biocl-possessing-oxygen-vacancies
#2
Hao Li, Feng Qin, Zhiping Yang, Ximin Cui, Jianfang Wang, Lizhi Zhang
Selective organic transformation under mild conditions constitutes a challenge in green chemistry, especially for alcohol oxidation, which typically requires environmentally unfriendly oxidants. Here, we report a new plasmonic catalyst of Au supported on BiOCl containing oxygen vacancies. It photocatalyzes selective benzyl alcohol oxidation with O2 under visible light through synergistic action of plasmonic hot electrons and holes. Oxygen vacancies on BiOCl facilitate the trapping and transfer of plasmonic hot electrons to adsorbed O2, producing •O2(‒) radicals, while plasmonic hot holes remaining on the Au surface mildly oxidize benzyl alcohol to corresponding carbon-centered radicals...
February 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28211967/generation-of-the-scf3-radical-by-photoredox-catalysis-intra-and-intermolecular-carbotrifluoromethylthiolation-of-alkenes
#3
Guillaume Dagousset, Cédric Simon, Elsa Anselmi, Béatrice Tuccio, Thierry Billard, Emmanuel Magnier
We report herein the first use of N-trifluoromethylthiosaccharin as the source of SCF3 radical under photoredox catalysis. This allowed an efficient and general visible-light-mediated carbotrifluoromethylthiolation of alkenes. Under the optimized conditions using fac-Ir(ppy)3 as the photocatalyst, various N-aryl acrylamides as well as a wide range of substituted styrenes can readily be difunctionalized in an intra- or intermolecular fashion, affording the corresponding SCF3-containing products in good to excellent yield...
February 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28211366/l-cysteine-assisted-synthesis-of-hierarchical-nis2-hollow-spheres-supported-carbon-nitride-as-photocatalysts-with-enhanced-lifetime
#4
Chengzhang Zhu, Zhifeng Jiang, Linlin Chen, Kun Qian, Jimin Xie
Novel hierarchical NiS2 hollow spheres modified by graphite-like carbon nitride were prepared using a facile L-cysteine-assisted solvothermal route. The NiS2/g-C3N4 composites exhibited excellent photocatalytic efficiency in rhodamine B, methyl orange and ciprofloxacin degradation as compared to single g-C3N4 and NiS2, which could be due to the synergistic effects of the unique hollow sphere-like structure, strong visible-light absorption and increased separation rate of the photoinduced electron-hole pairs at the intimate interface of heterojunctions...
March 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28210885/cohesin-biology-meets-the-loop-extrusion-model
#5
REVIEW
Christopher Barrington, Ronald Finn, Suzana Hadjur
Extensive research has revealed that cohesin acts as a topological device, trapping chromosomal DNA within a large tripartite ring. In so doing, cohesin contributes to the formation of compact and organized genomes. How exactly the cohesin subunits interact, how it opens, closes, and translocates on chromatin, and how it actually tethers DNA strands together are still being elucidated. A comprehensive understanding of these questions will shed light on how cohesin performs its many functions, including its recently proposed role as a chromatid loop extruder...
February 16, 2017: Chromosome Research
https://www.readbyqxmd.com/read/28207883/application-of-an-optimized-flow-cytometry-based-quantification-of-platelet-activation-pact-monitoring-platelet-activation-in-platelet-concentrates
#6
Cécile H Kicken, Mark Roest, Yvonne M C Henskens, Bas de Laat, Dana Huskens
BACKGROUND: Previous studies have shown that flow cytometry is a reliable test to quantify platelet function in stored platelet concentrates (PC). It is thought that flow cytometry is laborious and hence expensive. We have optimized the flow cytometry-based quantification of agonist induced platelet activation (PACT) to a labor, time and more cost-efficient test. Currently the quality of PCs is only monitored by visual inspection, because available assays are unreliable or too laborious for use in a clinical transfusion laboratory...
2017: PloS One
https://www.readbyqxmd.com/read/28207598/newly-formed-bone-induced-by-recombinant-human-bone-morphogenetic-protein-2-a-histological-observation
#7
Azumi Hirata, Takaaki Ueno, Peter K Moy
PURPOSE: To observe, histologically, bone induced by recombinant human bone morphogenetic protein-2 (rhBMP-2) in onlay grafted and sinus lifted alveolaris. MATERIAL AND METHODS: Eighteen patients were treated with rhBMP-2 at concentration 1.5 mg/mL with an absorbable collagen sponge (ACS). The treated bone was harvested with small trephine bur at 5 or 7 months after surgery for the micro Computer Scanning (CT) and light microscopic observation. RESULTS: Micro CT showed clearly 3-dimensional trabecular bone structure...
February 14, 2017: Implant Dentistry
https://www.readbyqxmd.com/read/28206863/comparison-of-volatiles-and-mosquito-capture-efficacy-for-three-carbohydrate-sources-in-a-yeast-fermentation-co2-generator
#8
Robert L Aldridge, Seth C Britch, Sandra A Allan, Maia Tsikolia, Lesly Carolina Calix, Ulrich R Bernier, Kenneth J Linthicum
Mosquito surveillance in remote areas with limited access to canisters of CO2 or dry ice will benefit from an effective alternative CO2 source, such as the natural production of CO2 from yeast fermentation. In this study, we investigate differences in mosquito capture rates from the Centers for Disease Control and Prevention (CDC) light traps baited with dry ice compared with traps baited with yeast fermentation of several carbohydrate sources over 23 trap-nights. Results demonstrated the ability of yeast-generated CO2 to effectively attract mosquitoes to a CDC trap, regardless of carbohydrate source...
December 2016: Journal of the American Mosquito Control Association
https://www.readbyqxmd.com/read/28206857/phenotypic-plasticity-in-response-to-seasonal-variation-in-populations-of-culex-melanoconion-bastagarius
#9
Jeronimo Alencar, Cecilia Ferreira de Mello, Hélcio R Gil-Santana, Christina S da Silva, Juliana S Sarmento, Ana Laura Carbajal de La Fuente
The present study aimed to determine the effects of seasonal variation on phenotypic variation in Culex bastagarius, using geometric morphometric analysis based on wing shape and size. Samples were collected in the Guapiaçu Ecological Reserve, in Rio de Janeiro, Brazil. Mosquitoes were captured once every 2 months (December 2012-January 2014) using light traps. The results of geometric morphometric analysis revealed variations in wing size; however, variability was not evident in wing shape. The present study provides novel data regarding phenotypic plasticity of Cx...
December 2016: Journal of the American Mosquito Control Association
https://www.readbyqxmd.com/read/28199775/a-photoregulated-dna-based-rotary-system-and-direct-observation-of-its-rotational-movement
#10
Yangyang Yang, Ryu Tashiro, Yuki Suzuki, Tomoko Emura, Kumi Hidaka, Hiroshi Sugiyama, Masayuki Endo
Various DNA-based nanodevices have been developed on the nanometer scale using light as regulation input. However, the programmed controllability is still a major challenge for these artificial nanodevices. Herein, we demonstrate a rotary DNA nanostructure in which the rotations are controlled by light. A bar-shaped DNA rotor, fabricated as a stiff double-crossover molecule, was placed on the top of a rectangular DNA tile. The photoresponsive oligonucleotides modified with azobenzenes were employed as switching motifs to release/trap the rotor at specific angular position on DNA tile by switching photoirradiations between ultraviolet and visible light...
February 15, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28198837/radially-dependent-angular-acceleration-of-twisted-light
#11
Jason Webster, Carmelo Rosales-Guzmán, Andrew Forbes
While photons travel in a straight line at constant velocity in free space, the intensity profile of structured light may be tailored for acceleration in any degree of freedom. Here we propose a simple approach to control the angular acceleration of light. Using Laguerre-Gaussian modes as our twisted beams carrying orbital angular momentum, we show that superpositions of opposite handedness result in a radially dependent angular acceleration as they pass through a focus (waist plane). Due to conservation of orbital angular momentum, we find that propagation dynamics are complex despite the free-space medium: the outer part of the beam (rings) rotates in an opposite direction to the inner part (petals), and while the outer part accelerates, the inner part decelerates...
February 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28198579/tweezing-of-magnetic-and-non-magnetic-objects-with-magnetic-fields
#12
REVIEW
Jaakko V I Timonen, Bartosz A Grzybowski
Although strong magnetic fields cannot be conveniently "focused" like light, modern microfabrication techniques enable preparation of microstructures with which the field gradients - and resulting magnetic forces - can be localized to very small dimensions. This ability provides the foundation for magnetic tweezers which in their classical variant can address magnetic targets. More recently, the so-called negative magnetophoretic tweezers have also been developed which enable trapping and manipulations of completely nonmagnetic particles provided that they are suspended in a high-magnetic-susceptibility liquid...
February 15, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28198374/magnetic-routing-of-light-induced-waveguides
#13
Yana Izdebskaya, Vladlen Shvedov, Gaetano Assanto, Wieslaw Krolikowski
Among photofunctional materials that can be employed to control the propagation of light by modifying their properties, soft dielectrics such as nematic liquid crystals (NLCs) stand out for their large all-optical response. Through reorientation, the molecular distribution of NLCs can be modified by the electric field of light, permitting functional operations and supporting self-localized light beams or spatial optical solitons. To date, the generation and routing of such solitons have been limited by the boundary conditions employed to tailor the properties of NLCs in planar cells or capillaries...
February 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28195482/the-influence-of-interfacial-effects-on-the-photophysics-of-rhodamine-6g-thin-films-on-a-poly-vinylidene-fluoride-surface
#14
Matthew Mullen, William B Euler
The spectral response of ultrathin films of rhodamine 6G (Rh6G) cast onto polyvinylidene fluoride (PVDF) coated glass slides are studied to investigate a perceived fluorescence emission enhancement. Varying the thickness of the Rh6G layer (submonolayer - multiple layers) on the PVDF layer revealed the existence of multiple Rh6G species on the surface, similar to previous reports on glass. Excitation spectra show that J-type excitons are not responsible for an emission enhancement. Trends in the fluorescence emission intensity show that the surface roughness of the PVDF layer prevents the Rh6G molecules from organizing the way they would on a smooth glass surface...
February 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28191006/capability-of-neutrophils-to-form-nets-is-not-directly-influenced-by-a-cma-targeting-peptide
#15
Christian Maueröder, Nicolas Schall, Frédéric Meyer, Aparna Mahajan, Benjamin Garnier, Jonas Hahn, Deborah Kienhöfer, Markus H Hoffmann, Sylviane Muller
During inflammatory reaction, neutrophils exhibit numerous cellular and immunological functions, notably the formation of neutrophil extracellular traps (NETs) and autophagy. NETs are composed of decondensed chromatin fibers coated with various antimicrobial molecules derived from neutrophil granules. NETs participate in antimicrobial defense and can also display detrimental roles and notably trigger some of the immune features of systemic lupus erythematosus (SLE) and other autoimmune diseases. Autophagy is a complex and finely regulated mechanism involved in the cell survival/death balance that may be connected to NET formation...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28187779/bio-efficacy-of-deltamethrin-based-durable-wall-lining-against-wild-populations-of-anopheles-gambiae-s-l-in-northern-tanzania
#16
Eliningaya J Kweka, Ming-Chieh Lee, Beda J Mwang'onde, Filemoni Tenu, Stephen Munga, Epiphania E Kimaro, Yousif E Himeidan
BACKGROUND: Indoor residual spraying (IRS) is one of the preferred tools used for control of malaria in many settings in the world. However, this control tool still faces challenges that include lack of long lasting active ingredient, limited number of well-trained personal, and need of repeated treatment which increases operational costs and reduces acceptability by residents. As a result there is need to develop and validate other methods which can complement the existing controls. The current study compared the bio-efficacy of durable wall lining (DL) (treated with deltamethrin 265 mg/m(2)) and IRS (with deltamethrin 5% WP at 20 mg/m(2)) on indoor mosquitoes densities and biting behaviour of mosquitoes in comparison with control houses without either DL or IRS...
February 10, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28187592/-i-culicoides-i-latreille-biting-midges-diptera-ceratopogonidae-of-the-dongzhaigang-mangrove-forest-hainan-province-china
#17
Jia-Hui Li, David Gopurenko, DU-Cheng Cai, Ye-Meng Yang, Rong Hu, Arunrat Thepparat, April H Wardhana, Heung-Chul Kim, Terry A Klein, Myung-Soon Kim, Glenn A Bellis
The biting midge fauna of Dongzhaigang Mangrove Forest, Hainan Province, China was sampled on 14 October 2015 using three methods: a pan light trap operated from dusk until dawn the following morning and sweep net and human landing collections performed between 16:15-17:15 hr. Eight species, including two new records for China, Culicoides palawanensis and C. niphanae, and one new record for Hainan, C. circumbasalis, were collected. A key to assist with identification of specimens of these species is provided...
January 31, 2017: Zootaxa
https://www.readbyqxmd.com/read/28186004/rich-stochastic-dynamics-of-co-doped-er-yb-fluorescence-upconversion-nanoparticles-in-the-presence-of-thermal-non-conservative-harmonic-and-optical-forces
#18
Rene A Nome, Cecilia Sorbello, Matías Jobbágy, Beatriz C Barja, Vitor Sanches, Joyce S Cruz, Vinicius F Aguiar
The stochastic dynamics of individual co-doped Er:Yb upconversion nanoparticles (UCNP) were investigated from experiments and simulations. The UCNP were characterized by high-resolution scanning electron microscopy, dynamic light scattering, and zeta potential measurements. Single UCNP measurements were performed by fluorescence upconversion micro-spectroscopy and optical trapping. The mean-square displacement (MSD) from single UCNP exhibited a time-dependent diffusion coefficient which was compared with Brownian dynamics simulations of a viscoelastic model of harmonically bound spheres...
February 10, 2017: Methods and Applications in Fluorescence
https://www.readbyqxmd.com/read/28181794/morphology-evolution-and-degradation-of-cspbbr3-nanocrystals-under-blue-light-emitting-diode-illumination
#19
Shouqiang Huang, Zhichun Li, Bo Wang, Nanwen Zhu, Congyang Zhang, Long Kong, Qi Zhang, Aidang Shan, Liang Li
Under illumination of light emitting diode (LED) or sunlight, the green color of all-inorganic CsPbBr3 perovskite nanocrystals (CPB-NCs) often quickly changes to yellow, and follows by large photoluminescence (PL) loss. To figure out what is happening on CPB-NCs during the color change process, the morphology, structure and PL evolutions are systematically investigated by varying the influence factors of illumination, moisture, oxygen and temperature. We find that the yellow color is mainly originated from the large CPB crystals formed in the illumination process...
February 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28177522/neutrophil-extracellular-traps-sequester-circulating-tumor-cells-via-%C3%AE-1-integrin-mediated-interactions
#20
Sara Najmeh, Jonathan Cools-Lartigue, Roni F Rayes, Stephen Gowing, Phil Vourtzoumis, France Bourdeau, Betty Giannias, Julie Berube, Simon Rousseau, Lorenzo E Ferri, Jonathan D Spicer
Despite advances in cancer treatment, metastasis remains today the main cause of cancer death. Local control through complete surgical resection of the primary tumor continues to be a key principle in cancer treatment. However, surgical interventions themselves lead to adverse oncologic outcomes and are associated with significantly increased rates of metastasis. Neutrophils through release of neutrophil extracellular traps (NETs) in response to infections were shown to be able to capture circulating cancer cells, and in doing so, support the development of metastatic disease...
February 8, 2017: International Journal of Cancer. Journal International du Cancer
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