Rav
Mostrando 13-24 de 100 artigos, teses e dissertações.
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13. x / Caracterização da microfísica da precipitação na região da Amazônia utilizando dados de radar e disdrômetro
A modulação diurna da convecção tem uma importante influência na forçante radiativa da cobertura de nuvens, sendo assim um fator de extrema relevância no balanço de radiação da Terra e na caracterização do ciclo diurno da precipitação descrita pelos modelos de circulação geral da atmosfera. A combinação entre diferentes medidas permite desc
Publicado em: 2007
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14. Espécies de Hypholoma (Fr.) P. Kumm. e Stropharia (Fr.) Quél. (Strophariaceae,Agaricales) no Rio Grande do Sul, Brasil
Espécimes de Hypholoma (Fr.) P. Kumm. e Stropharia (Fr.) Quél., ambos pertencentes à família Strophariaceae Singer & A.H. Sm., de ocorrência no estado do Rio Grande do Sul foram estudados. O estudo baseou-se em coletas realizadas pelo autor no período entre março de 2004 e setembro de 2005, e também na revisão do material depositado em herbários do
Publicado em: 2007
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15. RÃquiem à infÃncia: um estudo sobre Um sÃbado em 30 e Viva o cordÃo encarnado, de Luiz Marinho
Requiem à lâenfance Ãtudie deux comÃdies de Luiz Marinho (1926-2002), Um sÃbado em 30 et Viva o cordÃo encarnado. Le biais thÃorique que nous avons appliquà pour lâanalyse de ses piÃces a Ãtà celui de tracer, dans ses couches signifiantes, les formes du comique, à partir dâune lecture socioculturelle de lâauteur, ses propositions esthÃtiques
Publicado em: 2007
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16. Resistência do algodoeiro a ramulose e variabilidade de Colletotrichum gossypii f. sp. cephalosporioides
A resistência de quatro cultivares e 21 linhagens de algodão a ramulose (Colletotrichum gossypii f. sp. cephalosporioides ) foi avaliada em condições de campo, sob infecção natural, em látice quadrado de 5 x 5 com três repetições, em área onde a doença ocorre endemicamente. As linhagens CNPA 94-101 e CNPA precoce 2 foram empregadas como padrão d
Summa Phytopathologica. Publicado em: 2006-03
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17. Ribonucleotide Sequence Homology Among Avian Oncornaviruses
RNA sequence relatedness among avian RNA tumor virus genomes was analyzed by inhibition of DNA-RNA hybrid formation between 3H-labeled 35S viral RNA and an excess of leukemic or normal chicken cell DNA with increasing concentrations of unlabeled 35S viral RNA. The avian viruses tested were Rous associated virus (RAV)-0, avian myeloblastosis virus (AMV), RAV-
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18. Integration, expression, and infectivity of exogenously acquired proviruses of Rous-associated virus-O.
We investigated the integration sites, infectivities, and expression of Rous-associated virus-0 (Rav-0) DNAs in exogenously infected turkey and chicken cells. Restriction endonuclease analyses of the DNAs of RAV-0-infected cells indicated that unique integration sites of RAV-0 DNA were detectable in clones of RAV-0-infected cells but not in mass-infected cel
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19. Avian leukosis viruses of different subgroups and types isolated after passage of Rous sarcoma virus-Rous-associated virus-0 in cells from different ring-necked pheasant embryos.
Avian leukosis viruses of subgroups A and F (RAV-A and RAV-F) arose at a low rate after passage of Rous sarcoma virus-Rous-associated virus-0, which is subgroup E, in cells from ring-necked pheasant embryos. In cells of two embryos, all of the viruses isolated after virus passage were RAV-F. However, in cells of a third embryo, both RAV-A and RAV-F were isol
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20. Homology between avian oncornavirus RNAs and DNA from several avian species.
3H-labeled 35S RNA from avian myeloblastosis virus (AMV), Rous associated virus (RAV)-0, RAV-60, RAV-61, RAV-2, or B-77(w) was hybridized with an excess of cellular DNA from different avian species, i.e., normal or leukemic chickens, normal pheasants, turkeys, Japanese quails, or ducks. Approximately two to three copies of endogenous viral DNA were estimated
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21. Lack of infectivity of the endogenous avian leukosis virus-related genes in the DNA of uninfected chicken cells.
The infectivity of the avian leukosis virus-related genes in the DNA of four genetically distinct types of chicken cells was determined. Infectious DNA of Rous-associated virus-O(RAV-O) was obtained from V- chicken cells which were experimentally infected with RAV-O and from V+tvbs chicken cells, which spontaneously produced RAV-O and were sensitive to exoge
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22. Recombination between endogenous and exogenous RNA tumor virus genes as analyzed by nucleic acid hybridization.
Certain chicken cells that do not spontaneously release virus particles have been shown to produce a subgroup E avian RNA tumor virus, Rous-associated virus 60 (RAV-60), after infection with viruses of other subgroups. The nucleic acids of RAV-60 were analyzed for sequence homologies with the viral nucleic acids contained in the uninfected cell and with thos
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23. Embryonic infection with the endogenous avian leukosis virus Rous-associated virus-0 alters responses to exogenous avian leukosis virus infection.
We inoculated susceptible chicken embryos with the endogenous avian leukosis virus Rous-associated virus-0 (RAV-0) on day 6 of incubation. At 1 week after hatching, RAV-0-infected and control chickens were inoculated with either RAV-1 or RAV-2, exogenous viruses belonging to subgroups A and B, respectively. The chickens injected with RAV-0 as embryos remaine
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24. Sequences outside of the long terminal repeat determine the lymphomogenic potential of Rous-associated virus type 1.
Recombinant avian leukosis viruses have been constructed from the molecularly cloned DNAs of Rous-associated virus type 1 (RAV-1) and Rous-associated virus type 0(RAV-0). Virus encoded by the cloned RAV-1 DNA induced a high incidence of B-cell lymphoma and a moderate incidence of a variety of other neoplasms. Virus encoded by the cloned RAV-0 DNA did not cau