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1.
Arq. Inst. Biol ; 87: e0692019, 2020. ilus
Article in English | VETINDEX, LILACS | ID: biblio-1145886

ABSTRACT

Four deutonymphs of bulb mites (hypopus) from Rhizoglyphus echinopus (Fumouze & Robin) (Acari: Acaridae) were found attached to the head of Atta sexdens in Rio de Janeiro, Brazil. This mite species is commonly associated with ornamental plants and trees with bulbs, corms and tubers. The results of this study provided an insight into the phoretic relationship between mites and ants, indicating the role of the latter in the dispersion of the first. Despite the abundant and diverse mite fauna existing in ants, little is known about their diversity, biology, ecology and the nature of their associations.(AU)


Quatro deutoninfas de ácaros do bulbo (hipopus) da espécie Rhizoglyphus echinopus (Fumouze & Robin) (Acari: Acaridae) foram encontradas fixadas na cabeça de formigas da espécie Atta sexdens no Rio de Janeiro, Brasil. Essa espécie de ácaro está comumente associada a plantas ornamentais e plantas com bulbos e tubérculos. Os resultados desse estudo fornecem uma visão sobre a relação forética entre ácaros e formigas, indicando o papel destas últimas na dispersão dos primeiros. Apesar da abundância e da fauna diversa do ácaro em formigas, pouco se sabe sobre a diversidade, a biologia, a ecologia e a natureza dessa associação.(AU)


Subject(s)
Ants , Medulla Oblongata , Mites , Arthropods , Agricultural Pests , Acaridae , Plant Tubers , Insecta
2.
J Med Entomol ; 54(5): 1201-1212, 2017 09 01.
Article in English | MEDLINE | ID: mdl-28399274

ABSTRACT

The Rhipicephalus sanguineus (Latreille) complex (Acari:Ixodidae) is composed of species with intra- and interspecific morphological variation that make their diagnosis difficult. In the present study, male specimens of the R. sanguineus complex were collected from dogs in six districts of three regions of Brazil and submitted to molecular and scanning electron microscopy (SEM) analyses. Analysis of COX1 gene, 12S rDNA, and D-loop rDNA shows that ticks classified as R. sanguineus form two different clades. Morphological comparisons using SEM found adult males to exhibit morphological differences in Haller's organ, festoons, and adanal, spiracular, and genital plates, with the last having potential usefulness in distinguishing male specimens of the complex.


Subject(s)
Rhipicephalus sanguineus/ultrastructure , Animals , Brazil , Genes, Mitochondrial , Male , Microscopy, Electron, Scanning , Rhipicephalus sanguineus/genetics , Species Specificity
3.
Acta Trop ; 147: 6-11, 2015 Jul.
Article in English | MEDLINE | ID: mdl-25817237

ABSTRACT

Antibiotic-resistant bacteria in hospitals and communities increasingly threaten public health in Brazil and the rest of the World. There is an urgent need for additional antimicrobial drugs. Calliphorid blowfly larvae are a rich source of antimicrobial factors but the potential of Neotropical species has been neglected. This preliminary study evaluates the antimicrobial activity of the native excretions/secretions of larvae of three species of Brazilian calliphorids, Chrysomya megacephala, Chrysomya albiceps and Chrysomya putoria. Native excretions/secretions were collected from third instar larvae, sterile filtered and tested for antibacterial activity against Staphylococcus aureus 9518, Escherichia coli K12 4401 and Serratia marcescens 365. Turbidometric assays were made in micro-plates, using an ELISA reader, with readings taken up to 22 h. Bacterial suspensions at the start and end of each experiment were also serially diluted, spread on nutrient agar plates and then colony forming units counted. The physico-chemical characteristics of the native excretions/secretions were also tested by freezing/thawing, boiling, and protease digestion. The native excretions/secretions of larvae from these three Chrysomya species significantly inhibited bacterial growth. Therefore, Brazilian calliphorid flies could potentially provide new classes of antibiotics.


Subject(s)
Anti-Bacterial Agents/pharmacology , Bodily Secretions , Diptera/metabolism , Drug Discovery , Escherichia coli K12/drug effects , Larva/metabolism , Serratia marcescens/drug effects , Staphylococcus aureus/drug effects , Animals , Anti-Infective Agents/pharmacology , Brazil
4.
Rio de Janeiro; s.n; 2012. xv,89 p. ilus, tab, graf.
Thesis in Portuguese | LILACS | ID: lil-691461

ABSTRACT

A entomologia forense é uma ferramenta utilizada pela justiça criminal que usa os insetos como prova criminal, tanto na estimativa do intervalo pós-morte como em casos onde houve deslocamento do cadáver, maus-tratos de crianças, idosos ou incapazes, uso de substâncias químicas e na rota de entorpecentes. Conhecer os dados bionômicos existentes na literatura das espécies necrófagas é primordial para a aplicação correta desta técnica. Este trabalho teve como objetivo estudar a distribuição temporal de dípteros caliptrados, em três diferentes locais dentro do campus da Fiocruz, RJ, em duas estações climáticas durante dois anos consecutivos: primavera e outono. Como modelo experimental, foi utilizada uma carcaça de porco doméstico para cada ponto de coleta. Os experimentos foram realizados durante as estações da primavera dos anos de 2007 e 2008 e do outono de 2008 e 2009. Foram capturados 14645 dípteros caliptrados totalizando 42 espécies pertencentes às famílias Calliphoridae (nove espécies), Muscidae (14 espécies) e Sarcophagidae (19 espécies); 5099 dípteros caliptrados capturados na primavera de 2007 (34,82(por cento)), 5289 na primavera de 2008 (34,82(por cento)), 1343 capturados no outono de 2008 (9,17(por cento)) e 2914 no outono de 2009 (19,90(por cento)). As cinco espécies mais abundantes foram Chrysomya albiceps (16,55(por cento)), Atherigona orientalis (15,77(por cento)), Chrysomya megacephala (13,40(por cento)), Ophyra aenescens (12,52(por cento)) e Synthesiomyia nudiseta (10,17(por cento)); as demais espécies juntas obtiveram 31.59(por cento) do total.


Subject(s)
Diptera , Entomology , Forensic Medicine , Muscidae
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