oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Search Results: 1 - 10 of 303 matches for " culex. "
All listed articles are free for downloading (OA Articles)
Page 1 /303
Display every page Item
Observa??o sobre característica natural de oviposi??o de Culex (Melanoconion) Grupo Pilosus (Diptera: Culicidae)
Gomes,Almério de Castro; Concei??o,Maria Bernadete Elias da; Sallum,Maria Anice Mureb; Portes,Maria da Gra?a Teixeira; Machado,Jo?o Paradela; Silva,Isidoro José da;
Revista de Saúde Pública , 1998, DOI: 10.1590/S0034-89101998000400010
Abstract: eggs of culex (melanoconion) grupo pilosus were found in three oviposition traps set in the toilet of a bus station in joinville city, state of santa catarina, brazil, during a surveillance study of aedes aegypti. the intrinsic characteristic of group oviposition not directly on the water was confirmed.
Distribui??o sazonal de Culex (Culex) eduardoi Casal & Garcia (Diptera, Culicidae) em criadouros antrópicos introduzidos em mata residual degradada, área urbana de Curitiba, Paraná,Brasil
Ribeiro, Magda Clara Vieira da Costa;Tissot, Ana Cristina;Silva, Mário Ant?nio Navarro da;
Revista Brasileira de Zoologia , 2002, DOI: 10.1590/S0101-81752002000500008
Abstract: the utilization of artificial receptacles to oviposition by mosquitoes in forest environment may indicate a sinantropic tendency or behaviour. our data revealed that tires were as the most acceptable breeding for culex (culex) eduardoi casal & garcia 1968.the population density of this species was higher and summer seasons.
Observa??es sobre domicilia??o de mosquitos Culex (Melanoconion), em ambiente com acentuadas modifica??es antrópicas
Forattini,Oswaldo Paulo; Gomes,Almério de Castro; Kakitani,Iná; Marucci,Daniel;
Revista de Saúde Pública , 1991, DOI: 10.1590/S0034-89101991000400004
Abstract: some data on culex (melanoconion) mosquito behavior in human environments are presented. adults were collected simultaneously through peridomiciliary and extradomiciliary catches, with the use of human bait inclusive. dominant species were identified as cx. delpontei, cx. ocossa, cx. ribeirensis, cx. sacchettae and cx. taeniopus. in the domiciliary environment cx. ribeirensis and cx. sacchettae, the principal species found, were collected with considerables frequency by the use of human bait placed in the peridomiciliar environment. cx. delpontei and cx. ocossa showed a lower frequency in that environment. greater numbers of adults were obtained in the first three months of the year, particularly in march. nocturnal activities showed two apparently distincts patterns. one of them was presented by cx. ribeirensis, cx. sacchettae and cx. taeniopus as a curve increasing quickly during the first hours os the night and mantaining the same level until dawn. the other was shown by cx. delpontei and cx. ocossa, as a curve which increased gradually until midnight, and then decreased gradual by until dawn. breeding places of cx. delpontei were found in medium and large rivers with a covering of aquating floating vegetation, mainly pistia. considerations relating to those ecological aspects of epidemiological interest are made.
Gynandromorphs in mosquitoes (Diptera: Culicidae) from Valle del Cauca, Colombia
Barreto, Mauricio;Burbano, María E.;Barreto, Pablo;
Neotropical Entomology , 2008, DOI: 10.1590/S1519-566X2008000300008
Abstract: gynandromorphs of culex nigripalpus theobald (2), cx. pedroi sirivanakarn and belkin (1) and aedes albopictus (skuse) (2) are described. two individuals of the latter species were reared in the laboratory, while the remaining three specimens were wild-caught with different traps in rural areas in valle del cauca department, southwestern colombia. all of the individuals were mounted on microscopic slides with canada balsam. from each mosquito, main morphological characteristics are described and illustrated. due to the paucity of information about this subject, these findings as well as other relevant cases are discussed.
A new species of culex (Melanoconion) from atlantic tropical system of Souther Brazil (Diptera: Culicidae)
Forattini, Oswaldo Paulo;Sallum, Maria Anice Mureb;
Memórias do Instituto Oswaldo Cruz , 1989, DOI: 10.1590/S0074-02761989000100001
Abstract: the male adult of culex (melanoconion) anoplicitus, a new species from southern tropical atlantic system of brazil, south america, is described and illustrated. identification may be made by characteristic morphological aspects of genitalia which are peculiar to this species.
A new species of Cullex (Melanoconion) from the Amazonian Region (Diptera: Culicidae)
Foratini, Oswaldo Paulo;Sallum, Maria Anice Mureb;
Memórias do Instituto Oswaldo Cruz , 1992, DOI: 10.1590/S0074-02761992000200015
Abstract: culex (melanoconion) eknomios, a new species from amazonian region is described, including the adult, pupal and larval stages. available data about distribution and binomics are presented.
A new species of Culex (Melanoconion) from Southern Brazil (Diptera: Culicidae)
Forattini,Oswaldo Paulo; Sallum,Maria Anice Mureb;
Revista de Saúde Pública , 1985, DOI: 10.1590/S0034-89101985000200007
Abstract: a new species from southern brazil, named culex (melanoconion) ribeirensis is described. the description includes adults, pupal and larval stages, illustrating the morphological aspects and a picture of a breeding place. some data about known distribution and bionomics are presented.
Observa??es sobre os mosquitos Culex da cidade de S?o Paulo, Brasil
Forattini,Oswaldo Paulo; Ishiata,George Kenge; Rabello,Ernesto Xavier; Cotrim,Maria das Dores;
Revista de Saúde Pública , 1973, DOI: 10.1590/S0034-89101973000400001
Abstract: with the use of new jersey-50 light traps, a survey of culex mosquitoes was made in the urban área of s?o paulo city, brazil. beside culex pipiens fatigans several other species were found, mainly represented by culex chidesteri, c. dolosus and c. bidens. the combined incidence of these three populations follows nearly the fatigans one and frequently exceeding it. the most high levels of density were found at areas with water treatment but without sewage disposal. domiciliary collections showed great culex pipiens fatigans predominancy.
Evolución de la resistencia en una cepa de Culex quinquefasciatus a partir de la selección con el insecticida piretroide lambdacialotrina
TANIA GONZáLEZ,JUAN A BISSET,CRISTINA DíAZ,MARíA M RODRíGUEZ
Revista Cubana de Medicina Tropical , 1996,
Abstract: Se estudiaron los cambios en la resistencia a diferentes insecticidas en una cepa de Culex quinquefasciatus seleccionada en el laboratorio con dosis del piretroide lambdacialotrina que provocaran el 90 % de mortalidad en larvas. Se logró un aumento de la resistencia a este insecticida de 144,5 veces respecto al nivel original, y se obtuvo una cepa resistente (287x). También aumentaron los niveles de resistencia a metilpirimifos (2.4 veces), propoxur (6 veces), DDT (5,2 veces), clorpirifos (22 veces), cipermetrina (67,5 veces) y deltametrina (20,2 veces). Las frecuencias de los genes que codifican para las enzimas esterasas elevadas y acetilcolinesterasa modificada alcanzaron su máximo valor y se observaron cambios notables en los fenotipos para esterasas en las electroforesis en geles de poliacrilamida. Se detectó sinergismo de DEF y PB con lambdacialotrina, por lo que las esterasas elevadas y las esterasas de función múltiple pueden contribuir a la resistencia. The resistance change to different insecticides in Culex quinquesfasciatus strain select at the laboratory with doses of pyrethroid lambda-cyhalothrin that would cause a larva mortality of 90 % were studied. It was attained an increase of the resistance to this insecticide of 144.5 times compared with the original level, and it was obtained a resistant strain (287x). There was an increase of the levels of resistance to methyl-pyrimifos (2.4 times), propoxur (6 times), DDT (5,2 times), clorpirifos (22 time), cypermethrin (67.5 times), and deltamethrin (20.2 times). The frecuencies of the genes that codify for the elevated esterases enzymes and for the modified acetylcholinesterase reached their maximum value. Significant changes were observed in the phenotypes for esterases in the electrophoresis in polyacralamide gels. It was detected synergism of DEF and PB with lambda-cyhalothrin. Therefore, the elevated esterases and the esterases of multiple function may contribute to resistance.
Polymorphism of mitochondrial COI and nuclear ribosomal ITS2 in the Culex pipiens complex and in Culex torrentium (Diptera: Culicidae)
E Shaikevich,I Zakharov
Comparative Cytogenetics , 2010, DOI: 10.3897/compcytogen.v4i2.45
Abstract: Polymorphism of the mtDNA gene COI encoding cytochrome C oxidase subunit I was studied in the mosquitoes Culex pipiens Linnaeus, 1758 and C. torrentium Martini, 1925 from sixteen locations in Russia and in three laboratory strains of subtropical subspecies of the C. pipiens complex. Representatives of this complex are characterized by a high ecological plasticity and there are significant ecophysiological differences between its morphologically similar members. The full-size DNA sequence of the gene COI spans 1548 bp and has a total A+T content of 70.2 %. The TAA is a terminating codon in all studied representatives of the C. pipiens complex and C. torrentium. 64 variable nucleotide sites (4 %) were found, fifteen haplotypes were detected, and two heteroplasmic specimens of C. torrentium were recorded. COI haplotype diversity was low in Wolbachia–infected populations of the C. pipiens complex. Monomorphic haplotypes were found in C. p. quinquefasciatus and C. p. pipiens f. molestus. Three haplotypes were detected for the C. p. pipiens, but these haplotypes were not population-specific. On the other hand, each of the ten studied Wolbachia-uninfected C. torrentium individuals from three different populations had unique mitochondrial haplotypes. Polymorphism of the 478-bp ITS2 nucleotide sequences was similar in infected C. p. pipiens and C. p. pipiens f. molestus and uninfected C. torrentium specimens. The ITS2 genetic distance between C. p. pipiens and C. torrentium reached 12.5 %. Possible effects of Wolbachia invasion on C. pipiens populations are discussed.
Page 1 /303
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.