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https://www.readbyqxmd.com/read/28212349/household-dengue-prevention-interventions-expenditures-and-barriers-to-aedes-aegypti-control-in-machala-ecuador
#1
Naveed Heydari, David A Larsen, Marco Neira, Efraín Beltrán Ayala, Prissila Fernandez, Jefferson Adrian, Rosemary Rochford, Anna M Stewart-Ibarra
The Aedes aegypti mosquito is an efficient vector for the transmission of Zika, chikungunya, and dengue viruses, causing major epidemics and a significant social and economic burden throughout the tropics and subtropics. The primary means of preventing these diseases is household-level mosquito control. However, relatively little is known about the economic burden of Ae. aegypti control in resource-limited communities. We surveyed residents from 40 households in a high-risk community at the urban periphery in the city of Machala, Ecuador, on dengue perceptions, vector control interventions, household expenditures, and factors influencing purchasing decisions...
February 16, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28209513/isoamyl-alcohol-odor-promotes-longevity-and-stress-tolerance-via-daf-16-in-caenorhabditis-elegans
#2
Chiho Kurino, Tsubasa Furuhashi, Kaori Sudoh, Kazuichi Sakamoto
The possibility that odor plays a role in lifespan regulation through effects on the nervous system is indicated by research on Caenorhabditis elegans. In fact, ablation of AWA and AWC, which are suggested as olfactory neurons, has been shown to extend lifespan via DAF-16, a homolog of FoxO. However, the effects of odor stimuli on the lifespan still remain unclear. Thus, we here aimed to clarify the effect of attractive and repulsive odors on longevity and stress tolerance in C. elegans and to analyze the pathways thereof...
February 13, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28205633/does-zika-virus-infection-affect-mosquito-response-to-repellents
#3
Walter S Leal, Rosângela M R Barbosa, Fangfang Zeng, Gabriel B Faierstein, Kaiming Tan, Marcelo H S Paiva, Duschinka R D Guedes, Mônica M Crespo, Constância F J Ayres
The World Health Organization (WHO) recommends that people travelling to or living in areas with Zika virus (ZIKV) outbreaks or epidemics adopt prophylactic measures to reduce or eliminate mosquito bites, including the use of insect repellents. It is, however, unknown whether repellents are effective against ZIKV-infected mosquitoes, in part because of the ethical concerns related to exposing a human subject's arm to infected mosquitoes in the standard arm-in-cage assay. We used a previously developed, human subject-free behavioural assay, which mimics a human subject to evaluate the top two recommended insect repellents...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28202077/repellent-effects-of-the-essential-oils-of-cymbopogon-citratus-and-tagetes-minuta-on-the-sandfly-phlebotomus-duboscqi
#4
Albert Kimutai, Moses Ngeiywa, Margaret Mulaa, Peter G N Njagi, Johnstone Ingonga, Lydia B Nyamwamu, Cyprian Ombati, Philip Ngumbi
BACKGROUND: The sandfly, Phlebotomus duboscqi is a vector of zoonotic cutaneous leishmaniasis (ZCL) that is an important public health problem in Eastern Africa. Repellents have been used for protection of humans against vectors of ZCL and other vectors that transmit killer diseases including malaria, Rift Valley fever, dengue, and yellow fever. The repellent effects of different doses of the essential oils from the lemon grass, Cymbopogon citratus and Mexican marigold, Tagetes minuta were evaluated in a two-chamber bioassay against 3- to 7-day-old unfed females of P...
February 15, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28199941/effect-directed-analysis-reveals-inhibition-of-zebrafish-uptake-transporter-oatp1d1-by-caulerpenyne-a-major-secondary-metabolite-from-the-invasive-marine-alga-caulerpa-taxifolia
#5
P Marić, M Ahel, I Senta, S Terzić, I Mikac, A Žuljević, T Smital
Caulerpa taxifolia is a marine alga of tropical and subtropical distribution and a well-known invasive species in several temperate regions. Its invasiveness mainly stems from the production of secondary metabolites, some of which are toxic or repellent substances. In this study we investigated the possible inhibitory effects of C. taxifolia secondary metabolites on the activity of two zebrafish (Danio rerio) uptake transporters that transport organic anions (Oatp1d1) and cations (Oct1). Both transporters were transiently transfected and overexpressed in human embryonic kidney HEK293T cells...
February 2, 2017: Chemosphere
https://www.readbyqxmd.com/read/28197551/ephrina5-signaling-is-required-for-the-distinctive-targeting-of-raphe-serotonin-neurons-in-the-forebrain
#6
Teng Teng, Afsaneh Gaillard, Aude Muzerelle, Patricia Gaspar
Serotonin (5-HT) neurotransmission in the brain relies on a widespread axon terminal network originating from the hindbrain raphe nuclei. These projections are topographically organized such that the dorsal (DR), and median raphe (MnR) nuclei have different brain targets. However, the guidance molecules involved in this selective targeting in development are unknown. Here, we show the implication of ephrinA5 signaling in this process. We find that the EphA5 gene is selectively expressed in a subset of 5-HT neurons during embryonic and postnatal development...
January 2017: ENeuro
https://www.readbyqxmd.com/read/28195733/unidirectional-wetting-of-liquids-on-janus-nanostructure-arrays-under-various-media
#7
Peng Ge, Shuli Wang, Wendong Liu, Tieqiang Wang, Nianzuo Yu, Shunsheng Ye, Huaizhong Shen, Yuxin Wu, Junhu Zhang, Bai Yang
In this paper, we report the unidirectional wetting behavior of liquids (water and oil) on Janus silicon cylinder arrays (Si-CAs) under various media (air, water, and oil). The Janus cylinders were prepared by chemical modification of nano-cylinders with different molecules on two sides. Through adjusting surface energies of the modified molecules, the as-prepared surfaces could control the wetting behavior of different types of liquids under various media. Herein, we discuss the regularity systematically and propose a strategy for preparing anisotropic wetting surfaces under arbitrary media...
February 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28195666/stable-hydrophobic-metal-oxide-photocatalysts-via-grafting-polydimethylsiloxane-brush
#8
Sanghyuk Wooh, Noemí Encinas, Doris Vollmer, Hans-Jürgen Butt
Polydimethylsiloxane (PDMS) can be grafted to metal-oxide photocatalysts such as titanium oxide by simple UV irradiation in solution or melt. The PDMS graft metal oxides are still photocatalytically active. They are hydrophobic, liquid repellent, self-cleaning, prevent biofouling and are long-term stable even in UV light.
February 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28193253/artemisia-spp-essential-oils-against-the-disease-carrying-blowfly-calliphora-vomitoria
#9
Stefano Bedini, Guido Flamini, Francesca Cosci, Roberta Ascrizzi, Maria Cristina Echeverria, Lucia Guidi, Marco Landi, Andrea Lucchi, Barbara Conti
BACKGROUND: Synanthropic flies play a considerable role in the transmission of pathogenic and non-pathogenic microorganisms. In this work, the essential oil (EO) of two aromatic plants, Artemisia annua and Artemisia dracunculus, were evaluated for their abilities to control the blowfly Calliphora vomitoria. Artemisia annua and A. dracunculus EOs were extracted, analysed and tested in laboratory bioassays. Besides, the physiology of EOs toxicity and the EOs antibacterial and antifungal properties were evaluated...
February 13, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28192661/development-of-liquid-like-copolymer-nanocoatings-for-reactive-oil-repellent-surface
#10
Peng Liu, Hengdi Zhang, Wenqing He, Hualin Li, Jieke Jiang, Meijin Liu, Hongyan Sun, Mingliang He, Jiaxi Cui, Lei Jiang, Xi Yao
Here, we describe a simple method to prepare oil-repellent surfaces with inherent reactivity. Liquid-like copolymers with pendant reactive groups are covalently immobilized onto substrates via a sequential layer-by-layer method. The stable and transparent nanocoatings showed oil repellency to a broad range of organic liquids even in the presence of reactive sites. Functional molecules could be covalently immobilized onto the oil-repellent surfaces. Moreover, the liquid repellency can be maintained or finely tailored after post-chemical modification via synergically tailoring the film thickness, selection of capping molecules, and labeling degree of the capping molecules...
February 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/28192657/durable-and-hydrophobic-organic-inorganic-hybrid-coatings-via-fluoride-rearrangement-of-phenyl-t12-silsesquioxane-and-siloxanes
#11
David James Krug, Richard M Laine
There have been many successful efforts to enhance the water shedding properties of hydro-phobic and superhydrophobic coatings, but durability is often a secondary concern. Here we de-scribe durable and hydrophobic coatings prepared via fluoride catalyzed rearrangement reaction of dodecaphenylsilsesquioxane [PhSiO1.5]12 (DDPS) with octamethylcyclotetrasiloxane (D4). Hydrophobic properties and wear resistance are maximized by incorporating both low surface energy moieties with crosslinkable moieties into the siloxane network...
February 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28189117/blocking-transmission-of-vector-borne-diseases
#12
REVIEW
Sandra Schorderet-Weber, Sandra Noack, Paul M Selzer, Ronald Kaminsky
Vector-borne diseases are responsible for significant health problems in humans, as well as in companion and farm animals. Killing the vectors with ectoparasitic drugs before they have the opportunity to pass on their pathogens could be the ideal way to prevent vector borne diseases. Blocking of transmission might work when transmission is delayed during blood meal, as often happens in ticks. The recently described systemic isoxazolines have been shown to successfully prevent disease transmission under conditions of delayed pathogen transfer...
January 30, 2017: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/28181430/ellipsoidal-colloids-with-a-controlled-surface-roughness-via-bio-inspired-surface-engineering-building-blocks-for-liquid-marbles-and-superhydrophobic-surfaces
#13
Pengjiao Zhang, Lu Yang, Qiang Li, Songhai Wu, Shaoyi Jia, Zhanyong Li, Zhenkun Zhang, Linqi Shi
Understanding the important role of the surface roughness of nano-/colloidal particles and harnessing them for practical applications need novel strategies to control the particles' surface topology. Although there are many examples of spherical particles with a specific surface roughness, non-spherical ones with similar surface features are rare. The current work report a one-step, straightforward and bio-inspired surface engineering strategy to prepare ellipsoidal particles with a controlled surface roughness...
February 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28177245/controlling-the-structure-of-supraballs-by-ph-responsive-particle-assembly
#14
Takafumi Sekido, Sanghyuk Wooh, Regina Fuchs, Michael Kappl, Yoshinobu Nakamura, Hans-Jürgen Butt, Syuji Fujii
Supraballs of various sizes and compositions can be fabricated via drying of drops of aqueous colloidal dispersions on super-liquid-repellent surfaces with no chemical waste and energy consumption. A "supraball" is a particle composed of colloids. Many properties, such as mechanical strength and porosity, are determined by the ordering of a colloidal assembly. To tune such properties, a colloidal assembly needs to be controlled when supraballs are formed during drying. Here, we introduce a method to control a colloidal assembly of supraballs by adjusting the dispersity of the colloids...
February 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28171823/the-insect-repellents-a-silent-environmental-chemical-toxicant-to-the-health
#15
REVIEW
Dijendra Nath Roy, Ritobrata Goswami, Ayantika Pal
In recent years, a large number of insect repellents have been developed with the idea of consumer benefits. In addition to already known advantageous application of insect repellents, there is increasing concern about the potential toxicity in environment leading to health caused by random use of these compounds. An increasing number of evidence suggests that insect repellents may trigger undesirable hazardous interactions with biological systems with a potential to generate harmful effects including intermediate metabolites...
January 29, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28171762/ephs-and-ephrins
#16
Hannah Taylor, Jessica Campbell, Catherine D Nobes
Eph receptors comprise the largest family of receptor tyrosine kinases (RTKs), with fourteen receptors divided into two subfamilies - EphAs and EphBs. Yet, despite their multitude of functions in almost all tissues of the body, these receptors represent one of the most underappreciated RTK families. What makes Eph receptors unique is that their cognate ligands, the ephrins, are tethered to the cell surface, in contrast to other RTKs whose ligands are generally soluble. This phenomenon means that signalling through Eph receptors is largely dependent on cell-cell contact...
February 6, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28168028/sex-specific-responses-to-territorial-intrusions-in-a-communication-network-evidence-from-radio-tagged-great-tits
#17
Lysanne Snijders, Kees van Oers, Marc Naguib
Signals play a key role in the ecology and evolution of animal populations, influencing processes such as sexual selection and conflict resolution. In many species, sexually selected signals have a dual function: attracting mates and repelling rivals. Yet, to what extent males and females under natural conditions differentially respond to such signals remains poorly understood, due to a lack of field studies that simultaneously track both sexes. Using a novel spatial tracking system, we tested whether or not the spatial behavior of male and female great tits (Parus major) changes in relation to the vocal response of a territorial male neighbor to an intruder...
February 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28165121/repellent-activity-of-apiaceae-plant-essential-oils-and-their-constituents-against-adult-german-cockroaches
#18
Hyo-Rim Lee, Gil-Hah Kim, Won-Sil Choi, Il-Kwon Park
No abstract text is available yet for this article.
December 26, 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28165017/bet-hedging-in-bacteriocin-producing-escherichia-coli-populations-the-single-cell-perspective
#19
Bihter Bayramoglu, David Toubiana, Simon van Vliet, R Fredrik Inglis, Nadav Shnerb, Osnat Gillor
Production of public goods in biological systems is often a collaborative effort that may be detrimental to the producers. It is therefore sustainable only if a small fraction of the population shoulders the cost while the majority reap the benefits. We modelled this scenario using Escherichia coli populations producing colicins, an antibiotic that kills producer cells' close relatives. Colicin expression is a costly trait, and it has been proposed that only a small fraction of the population actively expresses the antibiotic...
February 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28164702/superoleophilic-titania-nanoparticle-coatings-with-fast-fingerprint-decomposition-and-high-transparency
#20
Hyungryul J Choi, Kyoo-Chul Park, Hyomin Lee, Thomas Crouzier, Michael F Rubner, Robert E Cohen, George Barbastathis, Gareth H McKinley
Low surface tension sebaceous liquids such as human fingerprint oils are readily deposited on high energy surfaces such as clean glass, leaving smudges that significantly lower transparency. There have been several attempts to prevent formation of these dactylograms on glass by employing oil-repellent textured surfaces. However, nanotextured superoleophobic coatings typically scatter visible light and the intrinsic thermodynamic metastability of the composite superoleophobic state can result in failure of the oil repellency under moderate contact pressure...
February 6, 2017: ACS Applied Materials & Interfaces
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