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Search Results: 1 - 10 of 61501 matches for " Ionizete Garcia da; "
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Avalia??o da atividade inibidora do diflubenzuron na ecdise das larvas de Aedes aegypti (Linnaeus, 1762) (Diptera, Culicidae)
Martins, Flávia;Silva, Ionizete Garcia da;
Revista da Sociedade Brasileira de Medicina Tropical , 2004, DOI: 10.1590/S0037-86822004000200004
Abstract: the inhibiting activity of diflubenzuron on the ecdysis of aedes aegypti larvae was evaluated, with a view to using this product in mosquito control. this study also aimed to determine the interaction between this product, the type of artificial containers and the susceptibility of the mosquito. bioassays were carried out in the backyard of a residence, using seven kinds of artificial habitats: tires, glass, concrete roofing, cans, plastic containers, cement and pottery. in each kind of artificial habitat, 20 aedes aegypti larvae in the 4th instar were set. the same number of larvae was used as a control. each test was repeated five times and the observation of mortality was done once every 24 hours, until 100% mortality was reached at 1 ppm. there was no significant difference between the main surveillance periods of the larvae, nor between the various kinds of artificial habitats. a significant difference was found between the instars, in that the 3rd instar was the most resistant to diflubenzuron inhibiting activity. it was also shown that concentrations did not interact with instars or material of the artificial habitats at the 5% significance level.
Avalia o da atividade inibidora do diflubenzuron na ecdise das larvas de Aedes aegypti (Linnaeus, 1762) (Diptera, Culicidae)
Martins Flávia,Silva Ionizete Garcia da
Revista da Sociedade Brasileira de Medicina Tropical , 2004,
Abstract: Foi avaliada a atividade inibidora do diflubenzuron na ecdise de larvas do Aedes aegypti, visando à utiliza o desse produto no controle desse mosquito. Além disso, conhecer a intera o do produto com o tipo de criadouro e a suscetibilidade do mosquito. Os bioensaios foram realizados em um fundo de quintal de residência, em sete tipos potenciais de criadouros artificiais: pneu, vidro, cimento-amianto, cimento, lata, plástico e ceramica. Para cada tipo de criadouro colocaram-se 20 larvas de cada estádio do Aedes aegypti. O mesmo número de larvas foi utilizado para o controle. Foram feitas nove réplicas e as leituras de mortalidade foram em intervalos de 24 horas, após o início dos experimentos, até atingir o índice de 100%. Isto foi obtido a 1 ppm. N o houve diferen a significativa entre os períodos médios de sobrevivência das larvas e nem entre os diferentes tipos de criadouros. Houve diferen as significativas entre os estádios, sendo o 3° o mais tolerante. Constatou-se também que as concentra es n o interagiram com os estádios e tipos de criadouros, ao nível de 5%.
Influência da temperatura na biologia de triatomíneos: IX. Rhodnius nasutus Stal, 1859 (Hemiptera, Reduviidae)
Silva, Ionizete Garcia da;Silva, Heloisa Helena Garcia da;
Memórias do Instituto Oswaldo Cruz , 1989, DOI: 10.1590/S0074-02761989000300013
Abstract: the influence of temperature on the biology of rhodnius nasutus stal, 1859 (hemiptera, reduviidae) was studied in order to obtain a larger number of triatominae reared in laboratory to use in xenodiagnosis and to be able to get information for their proper control. the experiments were performed in two climatized chambers at 25 ± 0,5oc and 30 ± 1oc, 70 ± 5% of relative humidity and photoperiod of 12 hours. data in relation to evolution cycle, period between emergency of adults and first oviposition, fecundity, fertility, amount of blood ingested and fast resistance, are presented. the mean duration of the evolutive cycle for males and females was 145,7 days at 25oc and 114,2 days at 30oc. the mean of blood ingested to complete the evolutive cycle was 304,3 mg and 350,3 mg at 25oc and 30oc, respectively. the triatominae survival on conditions of absolute fast was significantly higher at 25oc than at 30oc (p<0,001).
Influência do período de quiescência dos ovos sobre o ciclo de vida de Aedes aegypti (Linnaeus, 1762) (Diptera, Culicidae) em condi??es de laboratório
Silva, Heloisa Helena Garcia da;Silva, Ionizete Garcia da;
Revista da Sociedade Brasileira de Medicina Tropical , 1999, DOI: 10.1590/S0037-86821999000400003
Abstract: the influence of the period of egg quiescence on the life cycle of aedes aegypti (linnaeus, 1762) (diptera, culicidae) was studied under laboratory conditions in order to improve the management of vector control. the eggs are known to be the most resistant stages during development, allowing a long survival of the mosquitoes under unfavorable climatic conditions. the experiments were performed in a biological chamber kept at 28 ± 1oc temperature, with 80 ± 5% relative humidity and 12 hours of photophase. data about the influence of different periods of quiescence on eclosion, larval and pupal development and the developmentals cycle are presented. we observed a highly significant effect of the period of quiescence on larval eclosion. the period of quiescence had no influence on the duration of larval or pupal incubation. eggs originating from the same period of quiescence showed significantly different periods of incubation the larvae emerged in groups defined by the period of incubation. this group effect was significant during the cycle. in 99.8% of the cycles the variation was determined by incubation.
Influência do período de quiescência dos ovos sobre o ciclo de vida de Aedes aegypti (Linnaeus, 1762) (Diptera, Culicidae) em condi es de laboratório
Silva Heloisa Helena Garcia da,Silva Ionizete Garcia da
Revista da Sociedade Brasileira de Medicina Tropical , 1999,
Abstract: Estudou-se a influência do período de quiescência dos ovos no ciclo de vida de Aedes aegypti (Linnaeus, 1762) (Diptera, Culicidae) em condi es de laboratório, na busca de informa es que possam melhorar o direcionamento das a es de controle, pois sabe-se que o ovo é a forma mais resistente do ciclo biológico, possibilitando ao mosquito ampla sobrevida, devido à resistência às adversidades climáticas. Os experimentos foram realizados numa camara biológica, mantida à temperatura de 28 ± 1oC, com umidade relativa de 80 ± 5% e fotofase de 12 horas. Apresentam-se os dados da influência de diferentes períodos de quiescência sobre a eclos o das larvas, desenvolvimento larval e pupal, ciclo evolutivo. Verificou-se o efeito altamente significativo do período de quiescência na eclos o das larvas. O período de quiescência n o influenciou nas dura es dos períodos de incuba o, larval e pupal. Constatou-se que ovos de um mesmo período de quiescência apresentaram períodos de incuba o estatisticamente diferentes entre si. As larvas eclodiam em grupos, definidos pela incuba o, e este efeito de grupo foi significativo na dura o do ciclo. Pode-se afirmar que, em 99,8% dos ciclos, a varia o foi determinada pela incuba o.
Distribui??o geográfica e indicadores entomológicos de triatomíneos sinantrópicos capturados no Estado de Goiás
Oliveira, Ant?nio Wilson Soares de;Silva, Ionizete Garcia da;
Revista da Sociedade Brasileira de Medicina Tropical , 2007, DOI: 10.1590/S0037-86822007000200011
Abstract: the geographic distribution of triatomines in goiás and entomological indicators in the home environment are presented: home infestation, home triatomine density and vector infection by trypanosoma cruzi. the indicators studied were from triatomines captured inside and outside homes in 201 municipalities in the state of goiás, brazil, between 2000 and 2003. a total of 249,868 home units were investigated and 51,570 triatomines were captured, and 335 specimens were found to be infected with trypanosoma cruzi. infestation outside the home was significantly greater than infestation inside the home for the species triatoma sordida, followed by panstrongylus megistus. the contrary was observed with the species rhodnius neglectus, panstrongylus geniculatus and triatoma pseudomaculata (p<0.018). there was no significant difference between infestations inside and outside the home for the species panstrongylus diasi, triatoma costalimai and triatoma williami. only one specimen of triatoma infestans was captured in the year 2000.
Associa??o entre incidência de dengue, pluviosidade e densidade larvária de Aedes aegypti, no Estado de Goiás
Souza, Sócrates Siqueira de;Silva, Ionizete Garcia da;Silva, Heloísa Helena Garcia da;
Revista da Sociedade Brasileira de Medicina Tropical , 2010, DOI: 10.1590/S0037-86822010000200009
Abstract: introduction: the larval density of aedes aegypti fluctuates according to seasonal climatic changes. it rises in seasons with higher rainfall, according to the number of potential breeding sites available, thereby predisposing towards increased incidence of dengue. this study aimed to show the association between dengue cases, rainfall and the building infestation rate. methods: the municipalities were stratified according to the risk and transmission of dengue, and according to presence or absence of mosquito infestation. we used the building larval infestation rate as an indicator for the risk of transmission. results: there was a positive correlation between the building infestation rate, number of dengue cases and rainfall. disease transmission was greater during the first four months of each year studied (period of high rainfall) and lower between june and september (season with low rainfall). dengue cases occurred continually and in increased numbers between january and march of each year, and then declined in the months of april and may, when it ceased in most municipalities. the metropolitan region of goiania was responsible for more than 80% of the dengue cases in goiás. transmission was continuous throughout the year, although lower during the period from may to december. over the last three months, there was increased transmission, but usually still at low rates. conclusions: the positive correlation between the building infestation rate and rainfall, and between this rate and the incidence of cases, indicated a significant association between increasing transmission and increasing numbers of dengue cases.
Toxicidade do extrato etanólico de Magonia pubescens sobre larvas de Aedes aegypti
Arruda, Walquíria;Oliveira, Gláucia Maria Cavasin;Silva, Ionizete Garcia da;
Revista da Sociedade Brasileira de Medicina Tropical , 2003, DOI: 10.1590/S0037-86822003000100004
Abstract: crude ethanol extracted from magonia pubescens trunks was utilized to prove its effect in the intestinal tract of aedes aegypti 3rd instar larvae. exposure times (2, 4, 6, 8, 10, 12, and 13 hours) were tested to verify when the morphological alterations begin to occur, in the intestinal tract of the larvae. the toxic effect of the extract was mainly in the midgut, beginning at the anterior midgut and followed through to posterior midgut. the main alterations observed were partial or total cell destruction, high citoplasmatic vacuolization, increase of subperitrophic space, cell hypertrophy and the epithelium did not maintain its monolayer appearance. the alterations began after four hours of exposure to m. pubescens extract. observations of tissue sections from larvae treated for different lengths of time revealed a wide variation in the degree of damage between exposure periods and midgut larvae region. the present study provides evidence regarding the mode of action of the m. pubescens extract and suggests its potential utilization as a larvicide to control aedes aegypti mosquito.
Toxicidade do extrato etanólico de Magonia pubescens sobre larvas de Aedes aegypti
Arruda Walquíria,Oliveira Gláucia Maria Cavasin,Silva Ionizete Garcia da
Revista da Sociedade Brasileira de Medicina Tropical , 2003,
Abstract: O efeito do extrato bruto etanólico da casca do caule da Magonia pubescens foi analisado no tubo digestivo de larvas de terceiro estádio do Aedes aegypti. Diferentes tempos de exposi o (2, 4, 6, 8, 10, 12 e 13 horas) foram utilizados com a finalidade de verificar, de forma progressiva, as altera es morfológicas. Os efeitos tóxicos do e.b.e. foram evidenciados, principalmente, ao nível do mesêntero, iniciando-se na regi o anterior e, estendendo-se para a regi o posterior. As principais altera es observadas incluíram, destrui o total ou parcial das células, alta vacuoliza o citoplasmática, aumento do espa o subperitrófico, hipertrofia das células e, aparente estratifica o epitelial. Essas altera es iniciaram-se após 4 horas de tratamento, sendo que, diferentes graus de destrui o foram observados de acordo com o aumento do tempo de exposi o ao e.b.e. e com a parte do mesêntero analisado. Este trabalho evidencia o mecanismo de a o do e.b.e. da M. pubescens, ampliando o seu potencial de utiliza o no controle do A. aegypti.
Correla o entre a positividade do xenodiagnóstico artificial e a quantidade de sangue e triatomíneos utilizados no exame, em pacientes chagásicos cr nicos
Franco Yara Bandeira Azevedo,Silva Ionizete Garcia da,Rassi Anis,Rocha Alessandra Carla Rodrigues Galv?o
Revista da Sociedade Brasileira de Medicina Tropical , 2002,
Abstract: Estudou-se a correla o entre a positividade do xenodiagnóstico artificial e a quantidade utilizada de sangue e de triatomíneos, em 200 pacientes na fase cr nica da doen a de Chagas. Colheram-se 10 ou 40ml de sangue através de tubos a vácuo, heparinizados com 20,4UI, sendo realizado com 60 e 360 triatomíneos, respectivamente. Usou-se Dipetalogaster maximus, Triatoma infestans, Triatoma vitticeps e Rhodnius neglectus, nos estádios 1°, 3°, 3° e 4°, respectivamente. A coproscopia dos triatomíneos foi realizada aos 30 e 60 dias após a aplica o. A positividade do xenodiagnóstico com o primeiro e o segundo métodos foi de 19% e 44%, respectivamente, sendo altamente significativa a correla o entre a quantidade utilizada de sangue e triatomíneos e a positividade (p<0,01). A xenopositividade nas faixas etárias variou de 9,7 a 100%, sendo maior em jovens e adultos até 34 anos, e independente em rela o ao sexo dos pacientes.
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