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https://www.readbyqxmd.com/read/28334923/validated-rp-hplc-dad-method-for-the-quantification-of-insect-repellent-ethyl-2-aminobenzoate-in-membrane-moderated-matrix-type-monolithic-polymeric-device
#1
Johirul Islam, Kamaruz Zaman, Srijita Chakrabarti, Nilutpal Sharma Bora, Santa Mandal, Manash Pratim Pathak, Pakalapati Srinivas Raju, Pronobesh Chattopadhyay
A simple, accurate and sensitive reversed-phase high-performance liquid chromatographic (RP-HPLC) method has been developed for the estimation of ethyl 2-aminobenzoate (EAB) in a matrix type monolithic polymeric device and validated as per the International Conference on Harmonization guidelines. The analysis was performed isocratically on a ZORBAX Eclipse plus C18 analytical column (250 × 4.4 mm, 5 μm) and a diode array detector (DAD) using acetonitrile and water (75:25 v/v) as the mobile phase by keeping the flow-rate constant at 1...
March 14, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28334232/walking-responses-of-tribolium-castaneum-coleoptera-tenebrionidae-to-its-aggregation-pheromone-and-odors-of-wheat-infestations
#2
B J Stevenson, L Cai, C Faucher, M Michie, A Berna, Y Ren, A Anderson, S Chyb, W Xu
The red flour beetle, Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae), is a worldwide pest of stored grains. Using "Y"-tube olfactometry we studied the response of T. castaneum to odors from simulated wheat infestations containing conspecifics, and infestations containing the lesser grain borer, Rhyzopertha dominica (F.) (Coleoptera: Bostrichidae), and the granary weevil Sitophilus granarius (L.) (Coleoptera: Curculionidae). Tribolium castaneum larvae were significantly attracted to odors from all three test species...
March 3, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334229/functional-and-nonfunctional-forms-of-cquior91-an-odorant-selectivity-subunit-of-culex-quinquefasciatus
#3
David T Hughes, Julien Pelletier, Suhaila Rahman, Sisi Chen, Walter S Leal, Charles W Luetje
In Culex quinquefasciatus, CquiOR91 is the ortholog of 2 larvae-specific odorant receptors (ORs) from Anopheles gambiae (Agam\Or40, previously shown to respond to several odorant ligands including the broad-spectrum repellent N,N-diethyl-3-methylbenzamide, DEET) and Aedes aegypti (Aaeg\Or40). When we cloned full-length CquiOR91 from a Culex quinquefasciatus larval head RNA sample, we found 2 alleles of this OR, differing at 9 residues. Functional analysis using the Xenopus oocyte expression system and 2-electrode voltage clamp electrophysiology revealed one allele (CquiOR91...
March 3, 2017: Chemical Senses
https://www.readbyqxmd.com/read/28334192/insecticidal-properties-of-essential-oils-and-some-of-their-constituents-on-the-turkestan-cockroach-blattodea-blattidae
#4
Sudip Gaire, Mary O'Connell, Francisco O Holguin, Anup Amatya, Scott Bundy, Alvaro Romero
The Turkestan cockroach, Blatta lateralis (Walker), has become the most important peridomestic species in urban areas of the Southwestern United States. The aim of this study was to evaluate the use of botanical compounds to control this urban pest. We tested the acute toxicity and repellency of six botanical constituents and three essential oils on Turkestan cockroach nymphs. Chemical composition of the essential oils was also determined. Topical and fumigant assays with nymphs showed that thymol was the most toxic essential oil constituent, with a LD50 of 0...
March 3, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28330095/potential-mosquito-repellent-compounds-of-ocimum-species-against-3n7h-and-3q8i-of-anopheles-gambiae
#5
Venugopal Gaddaguti, Talluri Venkateswara Rao, Allu Prasada Rao
Mosquitoes are exceptionally efficient in detecting their hosts for blood meal using odorant binding proteins, viz. 3N7H and 3Q8I and spread several dreadful diseases. DEET is a synthetic mosquito repellent widely used all over world for protection against mosquito bite. Reports reveal that, synthetic mosquito repellents may pose health problems in considerably large population. In view of the above fact, we made an attempt to discover efficient and novel natural mosquito repellent compounds with least impact on human health...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28327611/biomimetic-surface-structuring-using-cylindrical-vector-femtosecond-laser-beams
#6
Evangelos Skoulas, Alexandra Manousaki, Costas Fotakis, Emmanuel Stratakis
We report on a new, single-step and scalable method to fabricate highly ordered, multi-directional and complex surface structures that mimic the unique morphological features of certain species found in nature. Biomimetic surface structuring was realized by exploiting the unique and versatile angular profile and the electric field symmetry of cylindrical vector (CV) femtosecond (fs) laser beams. It is shown that, highly controllable, periodic structures exhibiting sizes at nano-, micro- and dual- micro/nano scales can be directly written on Ni upon line and large area scanning with radial and azimuthal polarization beams...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28324242/numerical-insights-into-the-phase-diagram-of-p-atic-membranes-with-spherical-topology
#7
A G Hansen, N Ramakrishnan, P B Sunil Kumar, J H Ipsen
The properties of self-avoiding p-atic membranes restricted to spherical topology have been studied by Monte Carlo simulations of a triangulated random surface model. Spherically shaped p-atic membranes undergo a Kosterlitz-Thouless transition as expected with topology induced mutually repelling disclinations of the p-atic ordered phase. For flexible membranes the phase behaviour bears some resemblance to the spherically shaped case with a p-atic disordered crumpled phase and p-atic ordered, conformationally ordered (crinkled) phase separated by a KT-like transition with proliferation of disclinations...
March 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28322784/flaviviridae-viruses-use-a-common-molecular-mechanism-to-escape-nucleoside-analogue-inhibitors
#8
James J Valdés, Philip T Butterill, Daniel Růžek
The RNA-dependent RNA polymerases of Flaviviridae viruses are crucial for replication. The Flaviviridae polymerase is organized into structural motifs (A-G), with motifs F, A, C and E containing interrogating, priming and catalytic substrate-interacting sites. Modified nucleoside analogues act as antiviral drugs by targeting Flaviviridae polymerases and integrating into the synthesized product causing premature termination. A threonine mutation of a conserved serine residue in motif B of Flaviviridae polymerases renders resistance to 2'-C-methylated nucleoside analogues...
March 17, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28318002/dissipation-of-the-excess-energy-of-the-adsorbate-thermalization-via-electron-transfer
#9
Pawel Strak, Konrad Sakowski, Pawel Kempisty, Stanislaw Krukowski
A new scenario for the thermalization process of adsorbates at solid surfaces is proposed. The scenario is based on the existence of an electric dipole layer in which the electron wavefunctions extend over the positive ions, creating a strong local electric field which drags the electrons into the solid interior and repels the positive ions. During adsorption the electrons tunnel into the solid interior, conveying the excess energy. The positive ions are retarded by the field, losing the excess kinetic energy, and are located smoothly into the adsorption sites...
March 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28316243/underwater-transparent-miniature-mechanical-hand-based-on-femtosecond-laser-induced-controllable-oil-adhesive-patterned-glass-for-oil-droplet-manipulation
#10
Jinglan Huo, Qing Yang, Feng Chen, Jiale Yong, Yao Fang, Jingzhou Zhang, Lin Liu, Xun Hou
The development of underwater superoleophobic surfaces makes researchers be swept up in boundless imagination of their applications, thereinto the oil manipulation based on such surface attracts much attention. Here, we show a simple and effective way to fabricate an underwater transparent miniature "mechanical hand" based on controllable oil-adhesive patterned glass prepared by femtosecond laser. The underwater oil-adhesive force of the patterned glasses that compose the "mechanical hand" device can be controlled from ultralow to ultrahigh through adjusting the different fraction of the untreated flat glass area to the laser-ablated rough area...
March 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28304284/scanning-gate-microscopy-of-magnetic-focusing-in-graphene-devices-quantum-vs-classical-simulation
#11
Marko D Petrović, Slaviša Milovanović, Francois Peeters
We compare classical versus quantum electron transport in recently investigated magnetic focusing devices [S. Bhandari et al., Nano Lett. 16, 1690 (2016)] exposed to the perturbing potential of a scanning gate microscope (SGM). Using the Landauer-Büttiker formalism for a multi-terminal device, we calculate resistance maps that are obtained as the SGM tip is scanned over the sample. There are three unique regimes in which the scanning tip can operate (focusing, repelling, and mixed regime) which are investigated...
March 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28303526/a-herbivore-tag-and-trace-system-reveals-contact-and-density-dependent-repellence-of-a-root-toxin
#12
Zoe Bont, Carla Arce, Meret Huber, Wei Huang, Adrien Mestrot, Craig J Sturrock, Matthias Erb
Foraging behavior of root feeding organisms strongly affects plant-environment-interactions and ecosystem processes. However, the impact of plant chemistry on root herbivore movement in the soil is poorly understood. Here, we apply a simple technique to trace the movement of soil-dwelling insects in their habitats without disturbing or restricting their interactions with host plants. We tagged the root feeding larvae of Melolontha melolontha with a copper ring and repeatedly located their position in relation to their preferred host plant, Taraxacum officinale, using a commercial metal detector...
March 16, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28303280/insect-repellents-and-contact-sensitization-an-observational-study
#13
Monica Corazza, Annarosa Virgili, Alberto Maria Bertoldi, Giulia Toni, Dario Cristofaro, Alessandro Borghi
is missing (Short communication).
March 17, 2017: Acta Dermato-venereologica
https://www.readbyqxmd.com/read/28300199/effect-of-hydro-oleophobic-perfluorocarbon-chain-on-interfacial-behavior-and-mechanism-of-perfluorooctane-sulfonate-in-oil-water-mixture
#14
Pingping Meng, Shubo Deng, Ziwen Du, Bin Wang, Jun Huang, Yujue Wang, Gang Yu, Baoshan Xing
Perfluorocarbon chain of perfluorooctane sulfonate (PFOS) is not only hydrophobic but also oleophobic, and its effect on PFOS distribution in oil-water mixture and underlying mechanism are unclear. For the first time, we propose that PFOS can emulsify oil-water mixture only in the presence of air, completely different from hydrocarbon surfactants. The perfluorocarbon chain repels hydrophobic compounds and its oleophobicity increases with decreasing polarity of organic solvents. The formed emulsion in oil phase contains high concentrations of PFOS, resulting in PFOS decrease in water...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28297637/toxicity-of-%C3%AE-citronellol-geraniol-and-linalool-from-pelargonium-roseum-essential-oil-against-the-west-nile-and-filariasis-vector-culex-pipiens-diptera-culicidae
#15
Mohaddeseh Abouhosseini Tabari, Mohammad Reza Youssefi, Aryan Esfandiari, Giovanni Benelli
Insect vectors are responsible for spreading devastating parasites and pathogens. A large number of botanicals have been suggested for eco-friendly control programs against mosquito vectors, and some of them are aromatic plants. Pelargonium roseum, a species belonging to the Geraniaceae family, due to its pleasant rose-like odor may represent a suitable candidate as mosquito repellent and/or larvicide. In this research, we evaluated the toxicity of the essential oil from P. roseum and its major constituents against the West Nile and filariasis vector Culex pipiens...
March 6, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28296390/clickable-antifouling-polymer-brushes-for-polymer-pen-lithography
#16
Uwe Bog, Andres de Los Santos Pereira, Summer L Mueller, Shana Havenridge, Viviana Parrillo, Michael Bruns, Andrea E Holmes, Cesar Rodriguez-Emmenegger, Harald Fuchs, Michael Hirtz
Protein-repellent reactive surfaces that promote localized specific binding are highly desirable for applications in the biomedical field. Nonspecific adhesion will compromise the function of bioactive surfaces, leading to ambiguous results of binding assays and negating the binding specificity of patterned cell-adhesive motives. Localized specific binding is often achieved by attaching a linker to the surface, and the other side of the linker is used to bind specifically to a desired functional agent, as e...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28296187/lethal-and-sublethal-effects-of-pesticides-in-the-management-of-polyphagotarsonemus-latus-banks-acari-tarsonemidae-on-capsicum-annuum-l
#17
Mariana O Breda, José V Oliveira, Alberto B Esteves Filho, Douglas R S Barbosa, Andrezo A Santos
BACKGROUND: The evaluation of lethal and sublethal effects are of great importance for a complete assessment of the total impact of chemical compounds upon pest populations and the development of management strategies. At this study, the lethal and sublethal effects of different synthetic and botanical products were evaluated upon the broad mite, Polyphagotarsonemus latus (Banks), a major pest of Capsicum annuum L and other crops. RESULTS: Abamectin presented the highest lethal effect to P...
March 15, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28287561/magnetically-induced-rotating-rayleigh-taylor-instability
#18
Matthew M Scase, Kyle A Baldwin, Richard J A Hill
Classical techniques for investigating the Rayleigh-Taylor instability include using compressed gasses(1), rocketry(2) or linear electric motors(3) to reverse the effective direction of gravity, and accelerate the lighter fluid toward the denser fluid. Other authors(e.g.)(4)(,)(5)(,)(6) have separated a gravitationally unstable stratification with a barrier that is removed to initiate the flow. However, the parabolic initial interface in the case of a rotating stratification imposes significant technical difficulties experimentally...
March 3, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28283645/natural-flea-repellents
#19
(no author information available yet)
No abstract text is available yet for this article.
March 11, 2017: Veterinary Record
https://www.readbyqxmd.com/read/28283033/resting-and-feeding-preferences-of-anopheles-stephensi-in-an-urban-setting-perennial-for-malaria
#20
Shalu Thomas, Sangamithra Ravishankaran, N A Johnson Amala Justin, Aswin Asokan, Manu Thomas Mathai, Neena Valecha, Jacqui Montgomery, Matthew B Thomas, Alex Eapen
BACKGROUND: The Indian city of Chennai is endemic for malaria and the known local malaria vector is Anopheles stephensi. Plasmodium vivax is the predominant malaria parasite species, though Plasmodium falciparum is present at low levels. The urban ecotype of malaria prevails in Chennai with perennial transmission despite vector surveillance by the Urban Malaria Scheme (UMS) of the National Vector Borne Disease Control Programme (NVBDCP). Understanding the feeding and resting preferences, together with the transmission potential of adult vectors in the area is essential in effective planning and execution of improved vector control measures...
March 10, 2017: Malaria Journal
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