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Estudos bioqu?micos comparativos dos ovos de Rhipicephalus (Boophilus) microplus (Acari: Ixodidae) durante a oviposi??o / Biochemical Analysis of eggs of Rhipicephalus (Boophilus) microplus (Acari: Ixodidae) during the Oviposition.

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Previous issue date: 2011-01-28 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / To fill some gaps about the intrinsic mechanisms of the biology of oviposition of R. (B.) microplus, we evaluated the concentration of lipids and carbohydrates, as well as the variability of lipid in eggs per day of posture. For this, engorged females weighing between 151 and 360 mg were placed in controlled environment (27 ? 1 ? C, 80 ? 5% RH, darkness), and after beginning of laying, three samples of the eggs pool were daily collected, packed and preserved at -20 ? C. Samples 1 and 2, weighing 50 mg each, were used to quantitate lipids and glucose, and to evaluate the lipid profile, respectively; and the third sample, containing 1 g of eggs, was used to quantitate glycogen. The determination of total lipids was performed using phospho-vanillin reagent, while the concentrations of cholesterol, triglycerides and glucose were obtained by colorimetric determination using endpoint enzymatic kit. The level of glycogen was performed using the acid 3,5 dinitrosalicylic reactive . The results were analyzed by nonparametric Kruskal-Wallis and the relationship between the concentrations of substrates and the days of laying was assessed by polynomial regression. There was no significant difference in the concentrations of these substrates in eggs from different days of oviposition, as there was no relationship of these concentrations with the days of laying. After lipid extraction, the samples were performed in thin layer chromatography, high-performance (HPTLC) for neutral lipids and phospholipids. Then, densitometry was performed using the Image Master Total Lab and the daily percentage of each lipid in the samples was calculated. Among the neutral lipids were identified the hydrocarbons, esterified cholesterol, triglycerides, fatty acids, free cholesterol and diacylglycerol. Of these, the cholesterol ester showed the highest variation, it was not detected in eggs at the fifth day of oviposition. Among the phospholipids were detected the phosphatidic acid, phosphatidylethanolamine, phosphatidylcholine and sphingomyelin fosfatidilinusitol. This latter was absent in eggs of the seventh day onwards. Thus, the different rates of hatchability of eggs from different laying days cannot be attributed to the concentrations of total lipids, although some specific lipids such as cholesterol ester and sphingomyelin might influence the difference in larval hatchability, more researches are needed for clarify the role of these substrates in embryogenesis / Objetivando preencher algumas lacunas sobre os mecanismos intr?nsecos da biologia da oviposi??o de R. (B.) microplus, foram avaliadas as concentra??es de lip?dios e carboidratos, assim como a variabilidade lip?dica dos ovos postos em diferentes dias de postura. Para isso, f?meas ingurgitadas pesando entre 151 e 360 mg foram colocadas em estufa biol?gica sob condi??es controladas (27 ? 1oC, 80 ? 5% UR, escotofase), e ap?s in?cio da postura, tr?s amostras di?rias do ?pool? de ovos foram coletadas, acondicionadas e preservadas a ?20?C. As amostras 1 e 2, pesando 50 mg cada, foram utilizadas para dosar lip?dios e glicose, e avaliar o perfil de lip?dios, respectivamente; a amostra 3, contendo 1 g de ovos foi utilizada para dosar glicog?nio. A dosagem de lip?dios totais foi realizada atrav?s do reagente de fosfo-vanilina, enquanto as concentra??es de colesterol, triglicer?dios e glicose foram obtidas atrav?s de determina??o colorim?trica com a utiliza??o de kit enzim?tico de ponto final. A dosagem de glicog?nio foi realizada atrav?s do reativo ?cido 3,5 dinitrosalic?lico. Os resultados das dosagens foram analisados pelo teste n?o param?trico de Kruskal-Wallis e a rela??o entre as concentra??es dos substratos e os dias de postura foi avaliada atrav?s de Regress?o polinomial. N?o foram constatadas diferen?as significativas entre as concentra??es destes substratos nos ovos de diferentes dias de oviposi??o, assim como n?o houve rela??o dessas concentra??es com os dias de postura. Ap?s extra??o dos lip?dios das amostras, foram realizadas cromatografias em camada delgada de alto desempenho (HPTLC) para lip?dios neutros e fosfolip?dios. Em seguida, a densitometria foi realizada atrav?s do programa Image Master Total Lab e o percentual di?rio de cada lip?dio nas amostras foi calculado. Dentre os lip?dios neutros foram identificados hidrocarbonetos, colesterol esterificado, triglicer?dios, ?cidos graxos, colesterol livre e diacilglicerol. Destes, o colesterol esterificado foi o que apresentou maior varia??o, n?o sendo detectado nos ovos do quinto dia de oviposi??o. Dentre os fosfolip?dios foram detectados o ?cido fosfat?dico, fosfatidiletanolamina, fosfatidilcolina, fosfatidilinusitol e esfingomielina. Sendo este ?ltimo ausente nos ovos do s?timo dia de postura em diante. Assim, as diferentes taxas de eclodibilidade por dia de postura n?o podem ser atribu?das ?s concentra??es de lip?dios totais, embora alguns lip?dios espec?ficos como o colesterol esterificado e a esfingomielina possam ter influ?ncia na diferen?a de eclodibilidade larval, sendo necess?rios mais estudos para eclarecer o papel desses substratos na embriog?nese

Identiferoai:union.ndltd.org:IBICT/oai:localhost:jspui/1195
Date28 January 2011
CreatorsRaia, Vanessa de Almeida
ContributorsFamadas, K?tia Maria, Pedrenho, Adriana Rayol, Silva, Jairo Pinheiro, Cunha, Nathalie Costa da, Can?ado, Paulo Henrique Duarte, Prata, M?rcia Cristina de Azevedo
PublisherUniversidade Federal Rural do Rio de Janeiro, Programa de P?s-Gradua??o em Ci?ncias Veterin?rias, UFRRJ, Brasil, Instituto de Veterin?ria
Source SetsIBICT Brazilian ETDs
LanguagePortuguese
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis
Formatapplication/pdf
Sourcereponame:Biblioteca Digital de Teses e Dissertações da UFRRJ, instname:Universidade Federal Rural do Rio de Janeiro, instacron:UFRRJ
Rightsinfo:eu-repo/semantics/openAccess
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