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Search Results: 1 - 10 of 212 matches for " mosquitoes "
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"Irritability Level of Anopheles Stephensi to Different Insecticides in Iran"
H Vatandoost
Iranian Journal of Public Health , 2001,
Abstract: Susceptibility levels of a lab strain of An. Stephensi to WHO standard papers of DDT 4%, dieldrin 0.4%, malathion 5%, permethrin 0.25%, lambdacyhalothrin 0.1%, cyfluthrin 0.1% and deltamethrin 0.025% were determined in our laboratory in 1999. Results showed that at the diagnostic dose of insecticides this species exhibited resistance to DDT and dieldrin with mortality rate of 54±2.5% and 30±2.5%, respectively. Malathion 5% caused 96±1% mortality. Permethrin killed 90±2% of the populations. Alpha-cyano groups of pyrethroids, e.g., deltamethrin, cyfluthrin and lambdacyhalothrin had highest efficacy, the mortality was 99.5±0.5, 100%, and 99±0.5% respectively. The results of irritability of this species to lambdacyhalothrin, permethrin cyfluthrin and deltamethrin revealed that lambdacyhalothrin had the most and deltamethrin the least irritancy effect. The average number of take offs/fly/minutes for lambdacyhalothrin and deltamethrin were 1.699±0.35 and 0.946±0.13%, respectively. For permethrin and cyfluthrin the equivalent values were 1.52±0.2 and 1.385±0.25, respectively.
Topical Preparation of Newer and Safer Analogs of N,N-diethyl-2-phenylacetamide (DEPA) against Aedes aegypti Mosquitoes  [PDF]
Akanksha Garud, Kumaran Ganesan, Navneet Garud, R. Vijayaraghavan
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2013, DOI: 10.4236/jcdsa.2013.31A005

Cosmetic acceptability and primary skin irritation are the two main parameters for assessing the suitability of any topical formulation meant for protection against the painful bites of mosquitoes. In the present study four newer analogs of N,N-diethyl-2-phenylacetamide (DEPA), were synthesized and formulated for topical application as insect repellent. They were assessed for their irritant behavior on rabbit’s skin for erythema and edema. The topical formulations of the analogs were also assessed for their protection time at varying concentrations against Aedes aegypti mosquitoes.

Nocturnal man biting habits of mosquito species in Serian, Sarawak, Malaysia  [PDF]
Ahmad Rohani, Ismail Zamree, Wan Najdah Wan Mohamad Ali, Azahari Abdul Hadi, Matusop Asmad, David Lubim, Zurainee Mohamed Nor, Lee Han Lim
Advances in Entomology (AE) , 2013, DOI: 10.4236/ae.2013.12009
Abstract:  Knowledge of the composition and biting habits of mosquito associated with endemic areas is important in establishing sound vector control programmes and understanding the epidemiology of vector borne diseases. The biting activity cycle of several mosquito species in Serian, Sarawak was observed and described. Collections were carried out indoors and outdoors for 12 hours from 6.00 pm to 6.00 am using human landing catch techniques. A total of 7271 mosquitoes comprising 27 species belonging to sixgenera were collected. Mansonia bonneae (23.6%) was the predominant species caught in the study areas followed by Culex vishnui (22.3%), Culex pseudovishnui (19.6%) and Culex tritaenorhynchus (13.7%). A high rate of human biting activity by Ma. bonneae was detected during November but the activity was low during January.The biting activity of Ma.bonneae was found higher outdoor compared to indoorand peaked at 7.00 pm-8.00 pm.Cx.vishnui also exhibited similar biting activity peak while Anopheles letiferex-hibited biting activity peaked at 12.00 am-1.00 am.Cx.pseudovishnui showed biting patterns which were almost similar between indoor and outdoor activity and could be considered active throughout the 12 hour period.

André von Mühlen
Periódico Tchê Química , 2004,
Abstract: This project aims to study computer image analysis of malarial parasites using morphological operators as its main method of approach. Malaria is a life-threatening parasitic disease transmitted through female Anopheles mosquitoes. It is found throughout the tropical and subtropical regions of the world, and affects over 300 million people annually. As globalization, ease and frequency of travel increase, malaria cases may occur in any country. Over one million people die due to malaria every year.
P.F.D. Van Peenen,Soeroto Atmosoedjono,S. Eko Muljono,J. C. Lien
Bulletin of Health Research , 2012,
Abstract: Pengumpulan nyamuk dalam waktu singkat di sembilan tempat di Kalimantan Timur dan Selatan menghasilkan 57 species dari 11 genera. Species yang terbanyak dikumpulkan ialah dari genus Culex 27 percent Mansonia 16 percent. Anopheles 16 percent, Aedes 12 percent, Armigeres 7 percent, Mimomia 7 percent, Uranotaenia 7 percent, Hodgesia. Tripteroides, Heizmania dan Culiseta masing-masing 2 percent.
Isolation and identification of a distinct strain of Culex Flavivirus from mosquitoes collected in Mainland China
Wang Huanyu, Wang Haiyan, Fu Shihong, Liu Guifang, Liu Hong, Gao Xiaoyan, Song Lizhi, Simon Rayner, Xu Aiqiang, Liang Guodong
Virology Journal , 2012, DOI: 10.1186/1743-422x-9-73
Abstract: A virus (SDDM06-11) was isolated from Culexpipiens collected in Shandong Province, China in 2006. The strain caused cytopathic effect (CPE) in Aedesalbopictus (C6/36) cells by 3 days post-infection and immunofluorescence assay (IFA) showed a reaction with Japanese encephalitis virus (JEV) polyclonal antibodies. Phylogenetic analysis of the E gene sequence showed CxFV formed two genotypes with the SDDM06-11 strain assigned to genotype 1. Analysis of the E gene nucleotide homology showed the virus possessed characteristic amino acids at specific sites. The nucleotide homology of the open reading frame (ORF) was 94.8%-95.1% between SDDM06-11 and isolates from Japan, Iowa and Texas, and 90.2%-90.5% between SDDM06-11 and isolates from Uganda and Mexico.In this paper we report the first isolation and identification of an isolate of CxFV in mainland China. Phylogenetic analysis indicates the isolate belongs to genotype 1. Our findings provide insight into the occurrence of CxFV in Culex mosquito populations and its distribution on a global scale.The genus Flavivirus in the family Flaviviridae is a group of single stranded positive sense RNA viruses that are primarily arthropod borne [1]. Phylogenetic analysis classifies these viruses into mosquito-borne, tick-borne, no known vector and viruses that are specific to insects, but which do not infect vertebrates [2,3]. This final group includes cell fusing agent virus (CFAV) [4], Kamiti River virus (KRV)[5] and Culexflavivirus (CxFV)[6].CxFV is an insect-specific virus that can replicate in C6/36 cells but not in other mammalian cell lines. CxFV was first isolated in 2003 in Japan (in species Culexpipiens and Culextritaeniorhynchus) and then in Indonesia in 2004 (Culexquinquefasciatus)[6]. Subsequently the virus has been isolated in North America: Iowa and Texas in the United States [7,8] (2007-2008, Culexquinquefasciatus, Culexrestuans); Central America: Guatemala (2006, Culexquinquefasciatus) [9], the Yucatan peninsula in Me
Germline transformation of Aedes fluviatilis (Diptera:Culicidae) with the piggyBac transposable element
Rodrigues, Flávia Guimar?es;Oliveira, Sabrina Barbosa;Rocha, Bruno Coelho;Moreira, Luciano Andrade;
Memórias do Instituto Oswaldo Cruz , 2006, DOI: 10.1590/S0074-02762006000700008
Abstract: the technique to generate transgenic mosquitoes requires adaptation for each target species because of aspects related to species biology, sensitivity to manipulation and rearing conditions. here we tested different parameters on the microinjection procedure in order to obtain a transgenic neotropical mosquito species. by using a transposon-based strategy we were able to successfully transform aedes fluviatilis (lutz), which can be used as an avian malaria model. these results demonstrate the usefulness of the piggybac transposable element as a transformation vector for neotropical mosquito species and opens up new research frontiers for south american mosquito vectors.
Mosquitos no Parque Nacional da Serra dos Org?os, Estado do Rio de Janeiro, Brasil: III. Preferência horária para hematofagia
Guimar?es, Anthony érico;Victório, Vania M. N.;
Memórias do Instituto Oswaldo Cruz , 1986, DOI: 10.1590/S0074-02761986000100013
Abstract: as part of our study on the ecology of culicinae in the serra dos órg?os national park, state of rio de janeiro, we report here the preferential feeding hours of females for hematophagy. we have conducted, from march 1981 to february 1982, weekly captures on the human baits at soil level and at the tree canopy using different time schedules and during 24 consecutive hours. abiotic variables, such as illumination, temperature and humidity were taken in consideration. some species show clear diurnal preference for feeding on blood during the brightest hours of the day. among these are haemagogus leucocelaenus and ha. capricornii, which are important vectors of sylvan yellow fever in the north and central-west regions of brazil, as well as the majority of the sabethinae. other species were captured in large quantities during sunset and first hours of the evening: anopheles cruzii, the main carrier of human and simian malarias in south brazil, culex nigripalpus and trichoprosopon digitatum. many species can be present at different times without preference for any specific period, but we did not find any truly ecletic species.
Mosquito control based on larvicides in the State of Rio Grande do Sul, Brazil: choice of the control agent
Ruas-Neto, Ant?nio L.;Silveira, Sydnei M.;Colares, Evandro Ricardo da C.;
Cadernos de Saúde Pública , 1994, DOI: 10.1590/S0102-311X1994000200009
Abstract: a comparison between chemical and biological larvicides in routine operations against mosquitoes in rio grande do sul state was carried out in this study. in laboratory bioassays against culex quinquefasciatus, biological formulations vectobac 12 as and teknar 3000 (bacillus thuringiensis israelensis) as well as abg 6262 (b. sphaericus 2362), both in liquid and powder form, were highly effective. locally produced b.thuringiensis israelensis, formulations also yielded good results. among chemical larvicides, pyrethroid compounds pirisa and k-othrine yielded better results than the organophosphates lebaycid and abate. these last formulations yielded responses ten weaker than predicted in other studies. under field conditions, a dose of 1250 mg/m2 for biological formulations was considered adequate for routine application because at this level it is possible to overcome physical influences on results. only b.sphaericus preparations caused important disruption of mosquito colonization in active breeding sites. up to 39 weeks were tabulated without complete colonization in natural conditions and one month in artificially colonized tanks. this study suggests that biological alternatives should be considered in mosquito control programs. they may be a solution to such problems as resistance to larvicides, elimination of natural enemies, and short-lasting effects of applications.
Lista das espécies de Culicidae (Diptera) depositadas na Cole??o de Entomologia Pe. J. S. Moure
Tissot, Ana Cristina;Silva, Mario Antonio Navarro da;
Revista Brasileira de Entomologia , 2008, DOI: 10.1590/S0085-56262008000200004
Abstract: the entomological collection of departamento de zoologia of universidade federal do paraná (dzup) accommodates about 5,000,000 insect specimens. the collection of diptera is represented by approximately 2,000,000 specimens, being muscidae, culicidae and syrphidae the most representative families. the diptera order consists of approximately 150,000 described species and in the collection about 103,000 specimens within 78 families are registered. the list of species of the family culicidae presents 9,579 specimens within 2 subfamilies, 7 tribes, 17 genera, 26 subgenera and 85 species. most specimens were captured in forest remnants in urban and rural areas, wild and urban environments in coastal regions or urban areas of different cities of paraná state, including some species captured in the states of s?o paulo, mato grosso and santa catarina and at distrito federal. the specific information of each specimen, such as collection site, latitude, longitude, collector, collection date, collection method and the specialist's name who identified it, as well as taxonomic data (order, tribe, genus, subgenus and species), was included in a electronic data base.
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