Encontrados 13 documentos, a visualizar página 1 de 2
Neural Electrode Array Based on Aluminum: Fabrication and Characterization
Peixoto, Alexandre; Goncalves, Sandra; Da Silva, Alexandre Ferreira; Dias, Nuno S.; Correia, J. HiginoA unique neural electrode design is proposed with 3 mm long shafts made from an aluminum-based substrate. The electrode is composed by 100 individualized shafts in a 10 × 10 matrix, in which each aluminum shafts are precisely machined via dicing-saw cutting programs. The result is a bulk structure of aluminum with 65 ° angle sharp tips. Each electrode tip is covered by an iridium oxide thin film layer (ionic tr...
Copulatory courtship song in Lutzomyia migonei (Diptera: Psychodidae)
Vigoder,Felipe M; Souza,Nataly A; Peixoto,Alexandre ALutzomyia migonei is a vector of leishmaniasis with a wide distribution in South America, which could favour population differentiation and speciation. Cryptic species of the Lutzomyia longipalpis complex, the widely distributed sand fly vector of visceral leishmaniasis in Latin America, have previously been shown to display distinct copulation songs. We found that Lu. migonei males also produce a song during c...
Sex pheromone and period gene characterization of Lutzomyia longipalpis sensu l...
Salomón,Oscar D; Araki,Alejandra S; Hamilton,James GC; Acardi,Soraya A; Peixoto,Alexandre ALutzomyia longipalpis s.l. is the primary vector of Leishmania (L.) infantum in the New World. In this study, male Lutzomyia longipalpis specimens from Posadas, Argentina were characterized for two polymorphic markers: the male sex pheromone and the period (per) gene. The male sex pheromone was identified as (S)-9-methylgermacrene-B, the same compound produced by Lu. longipalpis from Paraguay and many populatio...
Chromosomal inversion polymorphism in Drosophila mediopunctata : seasonal, alti...
Ananina, Galina; Peixoto, Alexandre A.; Bitner-Mathé, Blanche C.; Souza, Wilma N.; Silva, Luciano Basso; Gaiesky, Vera Lucia da Silva ValenteThe most polymorphic chromosome for inversions in Drosophila mediopunctata is the chromosome II, where 17 inversions have been found, eight of which occurring in the distal region and nine in the proximal region. We present an analysis of the chromosome II inversion polymorphism with respect to seasonal, altitudinal and latitudinal variation. In D. mediopunctata from the Parque Nacional do Itatiaia (southeaster...
Desenvolvimento de software de controlo e análise de uma Sonda Multi-Funcional ...
Peixoto, Alexandre Coumiotis MoreiraHoje em dia, com o desenvolver da técnica de gestão de processos agrícolas, torna-se imperativo a utilização de aparelhos de medição mais precisos e baratos de forma a rentabilizar o processo agrícola. Tradicionalmente, a instrumentação associada a esse tipo de aparelhos revela alguns pontos fracos a serem desenvolvidos, tais como a necessidade de fios ou então o desfasamento temporal entre leitura e verificaçã...
Effect of the chitin synthesis inhibitor triflumuron on the development, viabil...
Belinato,Thiago Affonso; Martins,Ademir Jesus; Lima,José Bento Pereira; Lima-Camara,Tamara Nunes de; Peixoto,Alexandre Afrânio; Valle,DeniseThe control of Aedes aegypti is impaired due to the development of resistance to chemical insecticides. Insect Growth Regulators (IGR) exhibit distinct mechanisms of action and are considered potential vector control alternatives. Studies regarding the effects of sublethal IGR doses on the viability of resulting adults will contribute to eval-uating their impact in the field. We analyzed several aspects of Ae. ...
Reproductive isolation between sympatric and allopatric Brazilian populations o...
Souza,Nataly A; Andrade-Coelho,Claudia A; Vigoder,Felipe M; Ward,Richard D; Peixoto,Alexandre ALutzomyia longipalpis s.l., the main vector of Leishmania chagasi in Latin America, is a species complex although the exact number of siblings is yet unknown. In Brazil, the siblings differ in male copulatory courtship songs and pheromones that most certainly act as pre-zygotic reproductive barriers. Here we analysed the reproductive isolation between three allopatric and two sympatric populations of Lu. longip...
Lutzomyia longipalpis in Brazil: a complex or a single species? A mini-review
Bauzer,Luiz GSR; Souza,Nataly A; Maingon,Rhayza DC; Peixoto,Alexandre ALutzomyia longipalpis is the main vector of Leishmania infantum chagasi, the causative agent of American visceral leishmaniasis (AVL). Although there is strong evidence that Lu. longipalpis is a species complex, not all data concerning populations from Brazil support this hypothesis. The issue is still somewhat controversial for this large part of Lu. longipalpis distribution range even though that it is the La...
Moonlight and blood-feeding behaviour of Lutzomyia intermedia and Lutzomyia whi...
Souza,Nataly A; Andrade-Coelho,Cláudia A; Silva,Vanderlei C; Peixoto,Alexandre A; Rangel,Elizabeth FLutzomyia intermedia (Lutz & Neiva, 1912) and L. whitmani (Antunes & Coutinho, 1939) (Diptera: Psychodidae: Phlebotominae), two important vectors of American cutaneous leishmaniasis in Brazil, occur in sympatry in the locality of Posse county, Petrópolis municipality, state of Rio de Janeiro, Brazil. We investigated the influence of the lunar cycle on the frequency of specimens of the two species caught...
Evaluation of methoprene effect on Aedes aegypti (Diptera: Culicidae) developme...
Braga,Ima Aparecida; Mello,Cícero Brasileiro; Peixoto,Alexandre Afrânio; Valle,DeniseSeveral Brazilian Aedes aegypti populations are resistant to the larvicidae temephos. Methoprene, that inhibits adult emergence, is one of the alternatives envisaged by the Brazilian Dengue Control Program (PNCD). However, at Brazil vector infestation rates are measured through larvae indexes and it has been claimed that methoprene use in the field could face operational problems. In order to define a standardi...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||