Gene Nts
Mostrando 1-12 de 49 artigos, teses e dissertações.
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1. The study of the organization of the 5S ribosomal gene in populations of Amazonian Engystomops (Anura, Leiuperidae) / Estudo da organização do gene ribossomal 5S em populações de Engystomops da Amazônia (Anura, Leiuperidae)
O gênero Engystomops apresenta ampla distribuição geográfica e constitui um interessante grupo de anuros para estudos cariotípicos. As populações de Engystomops encontradas na Amazônia têm sua identificação taxonômica ainda controversa. Análises genéticas e citogenéticas apoiam hipóteses que sugerem a existência de um complexo de espécies c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2012
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2. Evolução temporal dos efeitos do treinamento aeróbio sobre o conteúdo de ácido g-aminobutírico e glutamato em áreas de controle autonômico de ratos normotensos e hipertensos. / Temporal evolution of the effects of aerobic training on the content of g-aminobutyric acid and glutamate in areas of autonomic control of normotensive and hypertensive rats.
A hipertensão arterial cursa com hiperativação de neurônios glutamatérgicos (excitatórios) e depressão de neurônios gabaérgicos (inibitórios) em áreas centrais autonômicas. Avaliamos em ratos SHR e WKY os efeitos temporais do treinamento aeróbio (T) sobre a expressão/funcionalidade das vias gabaérgicas e glutamatérgicas no núcleo paraventric
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/02/2012
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3. Desiccation tolerance and sensitivity in Medicago truncatula and Inga vera seeds
Orthodox seeds acquire desiccation tolerance (DT) during their development which enables them to pass through the phase of maturation drying by the end of their development and enter a state of quiescence. After harvesting, these seeds can be dried further and stored for the long-term without significant loss of viability. On the other hand, there are many s
Publicado em: 2006
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4. Regular distribution of length heterogeneities within non-transcribed spacer regions of cloned and genomic rDNA of Saccharomyces cerevisiae.
A length difference of about 50 bp in the EcoRI fragment B of the rDNA from two different strains of Saccharomyces cerevisiae has been mapped in detail by sequencing of cloned fragments. This 2.4 kb EcoRI fragment contains the start of the 35S rRNA gene at one end and the 5S rRNA gene in the middle flanked by non-transcribed spacers, NTS1 and NTS2. The diffe
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5. RNA polymerase II transcription inhibits DNA repair by photolyase in the transcribed strand of active yeast genes.
Yeast uses nucleotide excision repair (NER) and photolyase (photoreactivation) to repair cyclobutane pyrimidine dimers (CPDs) generated by ultraviolet light. In active genes, NER preferentially repairs the transcribed strand (TS). In contrast, we recently showed that photolyase preferentially repairs the non-transcribed strands (NTS) of the URA3 and HIS3 gen
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6. Identification of DNA cis Elements Essential for Expansion of Ribosomal DNA Repeats in Saccharomyces cerevisiae
Saccharomyces cerevisiae carries ∼150 ribosomal DNA (rDNA) copies in tandem repeats. Each repeat consists of the 35S rRNA gene, the NTS1 spacer, the 5S rRNA gene, and the NTS2 spacer. The FOB1 gene was previously shown to be required for replication fork block (RFB) activity at the RFB site in NTS1, for recombination hot spot (HOT1) activity, and for rDNA
American Society for Microbiology.
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7. In situ transcription and splicing in the Balbiani ring 3 gene
The Balbiani ring 3 (BR3) gene contains 38 introns, and more than half of them are co-transcriptionally excised. We have determined the in situ structure of the active BR3 gene by electron tomography. Each of the 20–25 nascent transcripts on the gene is present together with splicing factors and the RNA polymerase II in a nascent transcript and splicing
Oxford University Press.
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8. Isolation and properties of soybean [Glycine max (L.) Merr.] mutants that nodulate in the presence of high nitrate concentrations
Soybean seeds [Glycine max (L.) Merr. ev. Bragg] were mutagenized with ethyl methanesulfonate. The M2 progeny (i.e., the first generation after mutagenesis) of these seeds were screened for increased nodulation under high nitrate culture conditions. Fifteen independent nitrate-tolerant symbiotic (nts) mutants were obtained from 2500 M2 families. In culture o
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9. Structure and function of the nontranscribed spacer regions of yeast rDNA.
The sequences of the nontranscribed spacers (NTS) of cloned ribosomal DNA (rDNA) units from both Saccharomyces cerevisiae and Saccharomyces carlsbergensis were determined. The NTS sequences of both species were found to be 93% homologous. The major disparities comprise different frequencies of reiteration of short tracts of six to sixteen basepairs. Most of
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10. Transcriptional role for the nontranscribed spacer of rat ribosomal DNA.
In vitro transcription of the rat rRNA gene led to the identification of a region within a 3.4-kilobase fragment of the nontranscribed spacer (NTS) which significantly increased the transcription of rat ribosomal DNA. Promoter constructs containing this region were transcribed up to 17-fold more efficiently in vitro than templates with only 167 or 286 base p
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11. Interaction between the yeast mitochondrial and nuclear genomes influences the abundance of novel transcripts derived from the spacer region of the nuclear ribosomal DNA repeat.
We have identified stable transcripts from the so-called nontranscribed spacer region (NTS) of the nuclear ribosomal DNA repeat in certain respiration-deficient strains of Saccharomyces cerevisiae. These RNAs, which are transcribed from the same strand as is the 37S rRNA precursor, are 500 to 800 nucleotides long and extend from the 5' end of the 5S rRNA gen
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12. A conserved region in the sea urchin U1 snRNA promoter interacts with a developmentally regulated factor.
The expression of the sea urchin L. variegatus U1 snRNA gene is temporally regulated during embryogenesis. Using a microinjection assay we show that a region between 203 and 345 nts 5' of the gene is required for expression. There are four conserved regions between two sea urchin species in the 345 nts 5' to the U1 gene. One region, located at about -300, bi