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- Selective detection of human papilloma virus DNAs by specific synthetic DNA probesPublication . Cravador, A.; Herzog, A.; Houard, S.; D'ippolito, P.; Carroll, R.; Bollen, A.Specific oligodeoxynucleotide probes ranging from 20 to 35 nucleotides were defined to differentiate each of the HPV1a, 5, 6b, 8, 11, 16, 18 and 33. They were chosen using computer programs developed to compare simultaneously several 8000 bp long DNA sequences. Sequences common to all and to specific groups of the HPV DNA were also selected. Specificity of 32P-labelled probes for HPV6b, 11, 16, 18 and 33 was demonstrated and the sensitivity of the assays was evaluated by filter hybridization with viral clones and with DNA from cervical tumor biopsies. © 1989.
- A situação actual do Sida ao nível mundialPublication . Cravador, A.O objectivo deste artigo é informar sobre a situação actual do SIDA nos seus aspectos e implicações mais variados, da sua evolução, desde que foi descoberto e dos problemas sociais, políticos, legislativos e morais que o seu reconhecimento e a estratégia para o eliminar têm levantado em diferentes países.
- Highly specific and sensitive non-radioactive molecular identification of Phytophthora cinnamomiPublication . Coelho, A. C.; Cravador, A.; Bollen, A.; Ferraz, J. F. P.; Moreira, A. C.; Fauconnier, A.; Godfroid, EdmondIn response to the need for a faster, more reliable method for identifying Phytophthora cinnamomi in cork oak soils in Portugal, a simple, fast, sensitive molecular identification method is described. It is based on a colorimetric assay which involves an oligonucleotide capture probe covalently immobilised on microtitration wells, a multi-biotinylated oligonucleotide detection probe and the PCR-amplified target DNA. The target DNA is a 349 bp DNA fragment partially covering the 3'-translated and 3'- untranslated regions of the cinnamomin gene. When the specificity of the PCR reaction was evaluated in vitro using isolates of P. cinnamomi and eight other Phytophthora species, including the related P. cambivora, it was specific to P. cinnamomi. When 30 isolates of P. cinnamomi from oak roots in southern Portugal were assayed, 26 gave a strong positive response. The assay has a sensitivity of about 2±5 genome equivalents of P. cinnamomi. The reason for the negative response of four isolates remains unclear.
- Reduction vs acetalisation of some carbonyl-compounds by means of methylselenol and lewis-acidsPublication . Cravador, A.; Krief, A.; Hevesi, L.Aliphatic ketones and aromatic carbonyl compounds on reaction with methylselenol :and a Lewis acid, are shown to undergo acetalisation and/or reduction to methyl selenide, the unexpected reduction reaction being predominant in most cases.
- Exposition of cork oak roots to cryptogein reduced the Infection by Phytophtora cinnamomiPublication . Maia, I.; Medeira, C.; Candeias, I.; Moreira, A. C.; Melo, Eduardo P.; Cravador, A.The oomycete P. cinnamomi has been described as strong contributing factor to the decline of cork oak and holm oak stands occurring in the Iberian Peninsula. There are no eradication methods available against this pathogen.
- Anti-Phytophthora cinnamomi activity of Phlomis purpurea plant and root extractsPublication . Neves, D.; Caetano, P.; Oliveira, J. V.; Maia, Cristiana; Sousa, N.; Salgado, M.; Dionisio, L.; Magan, N.; Cravador, A.Phlomis purpurea (Lamiaceae), found in Quercus suber and Quercus ilex ssp. rotundifolia forest habitats in southern Portugal, is a non-host for the oomycete Phytophthora cinnamomi, the main biotic factor involved in cork oak and holm oak decline in the Iberian Peninsula. The effect of P. purpurea crude ethanol root extract was evaluated in vitro on P. cinnamomi mycelial growth, sporangial production, zoospore release and germination as well as on chlamydospore production and viability. The protection of cork oak against infection by the pathogen was also evaluated in planta. At 10 mg ml-1, in vitro inhibition of the pathogen structures was 85-100 %. In addition, P. purpurea plants were shown to protect Q. suber and Q. ilex from P. cinnamomi infection and to reduce the inoculum potential in glasshouse trials, indicating the ability to reduce root infection by the pathogen. The results suggest that P. purpurea has the potential to reduce disease spread and that their root extracts could provide candidate substances for control of the important pathogen, P. cinnamomi. © 2013 KNPV.
- Nouvelles méthodes de synthèse utilisant une entité séléniée comme précurseur de fonctionPublication . Cravador, A.Nous sommes intéressés au cours des derniéres annés à la mise au point de schémas de synthèses utilisant une entité séléniée comme précurseur de fonction.
- Molecular cloning, full-length sequence and preliminary characterization of a 56-kDa protein induced by human interferonsPublication . Wathelet, M.; Moutschen, S.; Defilippi, P.; Cravador, A.; Collet, M.; Huez, G.; Content, J.Among the various proteins which are induced when human cells are are treatened with interferon, a predominant protein of unknown function, with molecular mass 56 kDa, has been observed. With the aim of exploring the molecular basis of the regulation of this protein and of its mRNA, in order to understand its biological functionand its possible contribution to the various antiviral and non-antiviral actions exerted by interferons.
- Evolução da produção de leite em pequenos ruminantes: polimorfismos do gene da hormona de crescimentoPublication . Cravador, A.; Marques, M. Rosário; Belo, CarmonaOs efetivos autóctones de pequenos ruminantes têm vindo a diminuir,em parte devido ao seu baixo potencial produtivo. A necessidade de encontrar formas mais expeditas de aumentar o potencial produtivo das nossas raças, e assim promover a sua manutenção bem como a sustentabilidade dos sistemas extensivos onde são explorados, levou à procura de marcadores moleculares, nomeadamente no gene da hormona de crescimento (GH), associados com a produção e qualidade do leite em pequenos ruminantes. Nas raças ovinas Churra da Terra Quente, Merino da Beira Baixa, Saloia e Serra da Estrela e caprinas Algarvia e Serrana verificou -se que o gene da GH é muito polimórfico, tendo sido encontrados polimorfismos específicos em algumas das raças. Os resultados sugerem que os polimorfismos do gene da GH, entre outros (e.g., nas caseínas), poderão vir a ser utilizados na seleção assistida por marcadores genéticos, de modo a melhorar da produção de leite sem afetar a sua qualidade. Contudo, a resposta à seleção será sempre condicionada pela prática de um correto maneio alimentar dos animais.
- Unexpectedly easy formation of alpha-seleno-carbonyl compounds from vinyl selenidesPublication . Cravador, A.; Krief, A.Seleno-carbonyl compounds are formed on reaction of seleninic acid or anhydride with vinyl selenides and vinyl sulphides.