Polyploidy
Mostrando 25-36 de 116 artigos, teses e dissertações.
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25. Estudos evolutivos em Myrtaceae : aspectos citotaxonomicos e filogeneticos em Myrteae, enfatizando Psidium e generos relacionados
Myrtaceae is one of the most diverse families in Neotropical region; principally belong to Mata Atlântica and Cerrado, reaching 10 to 15% of biodiversity of these biomes. Myrteae is the most generically tribe (73 genera and 2375 species) in this family. Generally, South-American taxa are considered a complex group and biosystematic studies are necessary to
Publicado em: 2009
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26. Biossistematica das especies do complexo Anemopaegma arvense (Vell.) Stellf. ex de Souza (Bignoniaceae, Bignonieae) : aspectos anatomicos, citologicos, moleculares, morfologicos e reprodutivos / Biossystematics of the Anemopaegma arvense (Vell.) Stellf. ex de Souza complex (Bignoniaceae, Bignonieae) : anatomical, cytological, molecular, morphological and reproductive aspects
Anemopaegma arvense complex is constituted by species and varieties of difficult delimiting. Taxonomists opinions based upon morphologic features are controversial as to considering them either an only highly polymorphic species or separating them into different taxa. In order to help with the circumscription of such taxa, a biosystematic study was conducted
Publicado em: 2009
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27. Estudo comparativo entre híbridos diploides e tetraploides de mandioca (Manihot esculenta Crantz): citogenética, apomixia e anatomia caulinar
Os híbridos interespecíficos diploide e tetraploide entre Manihot esculenta Crantz e M. oligantha Pax foram analisados em nível citogenético, anatômico embrionário e anatômico caulinar com o objetivo de se verificar os efeitos do tratamento de poliploidização. A análise citogenética foi realizada para determinar o número cromossômico de esporoci
Publicado em: 2009
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28. AvaliaÃÃo de aberraÃÃes cromossÃmicas em bovinos (Bos taurus taurus) infectados pelo papilomavÃrus bovino
Bovine papillomavirus (BPV) is represented by 10 papillomavirus subtypes, epiteliotropic or mucosotropic, which are transmitted among bovines through contaminated blood and ephitelial contact. This virus may be in a latent form on host lymphocytes, triggering chromosomal instabilities. In this context, this study aimed to evaluate chromosomal aberrations whi
Publicado em: 2009
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29. Caracterização da diversidade genetica molecular em germoplasma de Brachiaria spp / Molecular genetic diversity characterization in a germplasm collection of Brachiaria spp
Brachiaria is a genus that comprises about 100 species. In the last decades, some of its species have been widely used as forages in the Tropics. A germplasm collection with 14 species represented by 443 accessions was introduced to Brazil in the decade of 1980 and is maintained at Embrapa Beef Cattle, Campo Grande, central Brazil. This collection has been u
Publicado em: 2009
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30. Citogenética evolutiva en Leguminosas americanas
ABSTRACT Chromosomic features described so far for Americans legumes are reviewed and analyzed, simultaneously with morphological and molecular characters. This is an invaluable opportunity to propose hypotheses about chromosome changes during the family divergence and speciation processes. The chromosome studies showed wide inter-generic, inter and intra-sp
Rodriguésia. Publicado em: 2008-07
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31. Polyploidy in accessions of Lippia alba (Mill) NE. Br (Verbenaceae) / Poliploidia em acessos de Lippia alba (Mill)NE Br (Verbenaceae)
Lippia alba Mill. N.E.Br, comumente conhecida no Brasil como cidreira, Ã uma planta medicinal nativa da AmÃrica do Sul, utilizada na medicina popular contra desordens gastrintestinais e respiratÃrias, dentre outras. Ã uma espÃcie cariologicamente variÃvel, que apresenta poliploidia natural entre indivÃduos, com nÃmeros cromossÃmicos de 2n=2x=30, 2n=
Publicado em: 2008
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32. Estudos biossistematicos em especies de Hoffmannseggella H.G. Jones (Orchidaceae: Laeliinae) ocorrentes em complexos rupestres de altitude / Biosystematic studies in Hoffmannseggella H.G. Jones (Orchidaceae: Laeliinae) occuring in altitude rocky complexes of Brazil
A biosystematic study of the neotropical and Brazilian endemic genus Hoffmannseggella H. G. Jones was carried out. This genus is characterized by rupiculous habit, with varied-contrasting flowers colors. These species are distributed at high altitude rocky complexes, mainly in the Southeast (MG, RJ and ES) and Northeast (BA). The geographic distribution patt
Publicado em: 2008
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33. Natural triploidy in Leporinus cf. elongatus bearing sex chromosomes
Although several cases of natural triploidy in fish have already been described, spontaneous polyploidy in species with differentiated sex chromosomes are rare. We report the occurrence of a triploid fish (3n = 81) Leporinus cf. elongatus, a species characterized by a highly differentiated ZZ/ZW sex chromosome system, from the São Francisco river. The occur
Genetics and Molecular Biology. Publicado em: 2007
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34. Desenvolvimento de marcadores moleculares EST-SSRs e mapeamento funcional em cana-de-açucar (Saccharum spp.) / Development of EST-SSR molecular markers and functional mapping in sugarcane
Sugarcane (Saccharum spp.) is one of the most important cash crops, highly contributing towards the production of raw sugar and bioethanol produced worldwide. Even though Brazil is the major producer, sugar yield is considered low. Breeding programs for the attainment of new improved sugarcane varieties, which are more productive and more resistant to plague
Publicado em: 2006
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35. Efeito da cisplatina em cultura de linhagens estabelecidas e sua capacidade de induzir transformação celular in vitro / Effesct of cisplatin on culture cell lines and its ability to induce cellular transformation in vitro
Cisplatin is an antineoplastic agent used to treat solid malignancies, such as testicular, ovarian and bladder tumors. However, both in vitro and in vivo, cisplatin has been shown to be mutagenic, genotoxic and tumorigenic. Maintained in culture, Vero cells presented behavioral and morphological alterations associated with cellular transformation in vitro, a
Publicado em: 2005
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36. Efeito citotóxico causado por emulsão lipídica contendo 7-cetocolesterol (OxLE) em cultura de células tumorais / Cytotoxic effects caused by 7-ketocholesterol-containing emulsion (OXLE) in tumor cells in culture
Oxysterols are oxygenated derivatives of cholesterol that may be formed by autoxidation or by action of specific enzymes. They exhibit a number of biologic activities including inhibition of cellular proliferation and cytotoxicity. Among oxysterols, 7-ketocholesterol (7-KC), that differs form cholesterol by a functional ketone group at C7, is known to induce
Publicado em: 2004