Tetrads
Mostrando 1-12 de 135 artigos, teses e dissertações.
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1. Pollen diversity in selected species of the tribe Chironieae (Gentianaceae Juss.) that occur in the Atlantic Forest, Brazil
ABSTRACT Based on molecular data, the tribe Chironieae (Gentianaceae) is divided into three subtribes. This study aims to describe the pollen morphology of representatives of two of the three subtribes that occur in the Atlantic Forest in order to contribute to a better understanding of the palynology of these taxa and to clarify the taxonomy of the family:
Acta Bot. Bras.. Publicado em: 2017-03
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2. Cytoembryological evaluation, meiotic behavior and pollen viability of Paspalum notatum tetraploidized plants
Abstract This study evaluated the mode of reproduction, the meiotic behavior and the pollen viability of three tetraploid plants (2n=4x=40) originated from somatic chromosome duplication of Paspalum notatum plants. The plant WKS 3 changed the mode of reproduction after duplication and became apomictic. The plants WKS 63 and WKS 92 confirmed sexual mode of re
Crop Breed. Appl. Biotechnol.. Publicado em: 2016-12
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3. Genotoxic evaluation of the River Paranaíba hydrographic basin in Monte Carmelo, MG, Brazil, by the Tradescantia micronucleus
Abstract Pollutants have adverse effects on human health and on other organisms that inhabit or use water resources. The aim of the present study was to assess the environmental quality of three watercourses in Monte Carmelo, MG, Brazil, using the micronucleus test on Tradescantia. For each treatment, 15 plants were exposed to water samples for 24 h. The con
Genet. Mol. Biol.. Publicado em: 2015-12
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4. Avaliação do potencial genotóxico e citotóxico associado a queima artesanal da castanha de caju no Município de João Câmara
The Brazil is the third largest producer of cashew nuts in the world. Despite the social and economic importance of the cashew nut, its production is still carried out artisanally. One of the main problems encountered in the cashew production chain are the conditions under which the roasting of the nut occurs to obtain the kernel from the shell. In the prese
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/10/2011
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5. Avaliação dos constituintes e do potencial mutagênico do material particulado oriundo do beneficiamento artesanal da castanha do caju / Assessment of the components and mutagenic potential of particulate matter from artisanal cashew nut roasting
x Despite the social and economic importance of the processing of cashew nuts to Rio Grande do Norte, the production is still carried out artisanally. To collect the almond nut is necessary to roasting. The smoke generated during the burning of the nut has high concentrations of particulate matter (PM) and the PM produced is inhaled daily by families for a p
Publicado em: 2010
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6. Sistemas de referência locais no espaço-tempo
A descrição métrica do campo gravitacional não permite a definição de uma densidade de energia gravitacional tensorial. Uma definição surge no Teleparalelismo Equivalente à Relatividade Geral, que utiliza tétradas ao invés do tensor métrico para a descrição do campo gravitacional. Consideramos tétradas como sistemas de referência locais adapt
Publicado em: 2009
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7. Systematics of Helieae Gilg (Gentianaceae) / Sistemática de Helieae Gilg (Gentianaceae)
Helieae, one of the six Gentianaceae tribes, comprises about 23 genera and over 200 species found exclusively in the Neotropics. It is a highly diverse assemblage of plants, which have traditionally been problematic regarding generic circumscriptions. Several Helieae genera were understudied and phylogenetic relationships within the tribe were unclear. On th
Publicado em: 2009
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8. Filogenia do complexo Caladieae-zomicarpeae (araceae) baseada em seqüências do DNA plastidial
The complex Caladieae-Zomicarpeae is composed by the genera Zomicarpa, Zomicarpella, Ulearum, Filarum, Hapaline, Scaphispatha, Caladium, Jasarum, Xanthosoma, Chlorospatha and Syngonium. The complex has an essentially Neotropical distribution, with the sole exception of the Asian genera Hapaline. The group contains elements of moderate economic importance, as
Publicado em: 2008
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9. CARACTERIZAÇÃO MOLECULAR E BIOQUÍMICA DE CEPAS DE Saccharomyces cerevisiae UTILIZADAS NA CARACTERIZAÇÃO MOLECULAR E BIOQUÍMICA
Aiming the molecular characterization of Saccharomyces cerevisiae LBCM 427 strain, selected from fermentations vats of a cachaça distillery, several analysis using polymorphism analysis of DNA for the characterization/discrimination of this and the selvagem strains present in the origin place was used. Results showed that RAPD-PCR, mtDNA, and PCR using comp
Publicado em: 2007
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10. Meiose em hÃbridos hexaplÃides de capim elefante e milheto / Meiosis in hexaploid hybrids between elephant grass and pearl millet
A strategy of the breeding programs of the elephant grass (Pennisetum purpureum 2n = 2x = 28), is the hybrid production between elephant grass and pearl millet (P. glaucum, 2n = 2x = 14), originating triploids hybrids and sterile, however presenting forage quality and providing the obtaining of cultivars superiors to intensify the dairy production. The steri
Publicado em: 2006
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11. Symmetric pollen mitosis I and suppression of pollen mitosis II prevent pollen development in Brachiaria jubata (Gramineae)
Microsporogenesis and pollen development were analyzed in a tetraploid (2n = 4x = 36) accession of the forage grass Brachiaria jubata (BRA 007820) from the Embrapa Beef Cattle Brachiaria collection that showed partial male sterility. Microsporocytes and pollen grains were prepared by squashing and staining with 0.5% propionic carmine. The meiotic process was
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-11
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12. DISTRIBUIÇÃO DA VARIABILIDADE GENÉTICA EM POPULAÇÕES NATURAIS DE Baccharis trimera (Less) DC. (CARQUEJA) NO SUL DO BRASIL. / GENETIC VARIABILITY DISTRIBUTION IN NATURAL POPULATIONS OF Baccharis trimera (Less) DC. (CARQUEJA) IN SOUTHERN BRAZIL
Carqueja (Baccharis trimera) is a native plant from South America, occurs in several settings, it is highly employed in popular medicine, and has been explored under a grasping way. This study had the purpose of producing information for the establishment of adequate strategies to the conservation of genetic resources of this specie. Assuming this, one searc
Publicado em: 2004