Class I Codes
Mostrando 1-12 de 36 artigos, teses e dissertações.
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1. Avaliação da metodologia de cálculo de dose em microdosimetria com fontes de elétrons com o uso de código MCNP5 / Evaluation of the methodology for dose calculation in microdosimetry with electrons sources using the MCNP5 code
Este trabalho realizou uma comparação entre alguns dos principais códigos de transporte que empregam a abordagem estocástica de Monte Carlo para aplicação em cálculos dosimétricos em Medicina Nuclear. Foram analisados com detalhes os diversos modelos físicos e numéricos utilizados pelo código MCNP5 em relação códigos como Penelope e EGS. A iden
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/11/2010
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2. Ateliê de vídeo e cultura juvenil: um estudo de caso sobre aprendizagem e socialização de jovens urbanos de segmentos populares através das tecnologias do vídeo digital / Video atelier and youth culture: a case study on the learning and socialization of urban young people from poor social segments through digital video technologies
The goal of this study is to investigate how video technologies can mediate new ways to learn and socialize. The core question it aims to answer is how and why a video atelier contributes to the education of low-income class youths living in poor suburbs of Great São Paulo, using video creation and production strategies. In the investigation process I have
Publicado em: 2007
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3. Concerted evolution of class I genes in the major histocompatibility complex of murine rodents.
Full-length cDNA sequences of two class I major histocompatibility complex molecules from the DA strain of Rattus norvegicus are reported. One codes for the classical class I restriction element RT1.Aa, which maps to the locus in the rat major histocompatibility complex homologous to H-2K in the mouse. The other probably codes for a soluble nonclassical clas
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4. Class I release factors in ciliates with variant genetic codes
In eukaryotes with the universal genetic code a single class I release factor (eRF1) most probably recognizes all stop codons (UAA, UAG and UGA) and is essential for termination of nascent peptide synthesis. It is well established that stop codons have been reassigned to amino acid codons at least three times among ciliates. The codon specificities of c
Oxford University Press.
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5. Negative and positive regulation of human leukocyte antigen class I gene transcription in K562 leukemia cells.
The mechanism of transcriptional activation of human leukocyte antigen class I genes by gamma interferon and 5-azacytidine was studied in K562 human leukemia cells. Nuclear run-on transcription assays with various protein and RNA synthesis inhibitors yield evidence for both stimulation of a positive regulatory factor and inhibition of an mRNA that codes for
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6. Deletion Mapping of the Genes Coding for HPr and Enzyme I of the Phosphoenolpyruvate: Sugar Phosphotransferase System in Salmonella typhimurium
Sugars transported by a bacterial phosphoenolpyruvate:sugar phosphotransferase system (PTS) require two soluble proteins: HPr, a low-molecular-weight phosphate-carrier protein, and enzyme I. The structural genes coding for HPr (ptsH) and Enzyme I (ptsI) are shown to be cotransducible in Salmonella typhimurium. The gene order of this region of the Salmonella
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7. Downregulation of MHC class I expression due to interference with p105-NF kappa B1 processing by Ad12E1A.
We have previously demonstrated that expression of major histocompatibility complex (MHC) class I genes is repressed in baby rat kidney cells transformed by early region 1 of oncogenic adenovirus type 12 (Ad12E1). Reduced expression of MHC class I antigens contributes to the escape of Ad12-transformed cells from T-cell-mediated immune surveillance and to tum
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8. Identification and sequence analysis of the Rhizobium meliloti dctA gene encoding the C4-dicarboxylate carrier.
Transposon Tn5-induced C4-dicarboxylate transport mutants of Rhizobium meliloti 2011 which could be complemented by cosmid pRmSC121 were subdivided into two classes. Class I mutants (RMS37 and RMS938) were defective in symbiotic C4-dicarboxylate transport and in nitrogen fixation. They were mutated in the structural gene dctA, which codes for the C4-dicarbox
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9. A novel class of plant proteins containing a homeodomain with a closely linked leucine zipper motif.
The homeobox, a 183 bp DNA sequence element, was originally identified as a region of sequence similarity between many Drosophila homeotic genes. The homeobox codes for a DNA-binding motif known as the homeodomain. Homeobox genes have been found in many animal species, including sea urchins, nematodes, frogs, mice and humans. To isolate homeobox-containing s
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10. Structural and functional analysis of Tn4430: identification of an integrase-like protein involved in the co-integrate-resolution process.
The 4149-bp transposon Tn4430 from Bacillus thuringiensis is delineated by 38-bp inverted repeats and codes for a 113-kd protein that shares homology with the transposases (TnpA) of Tn3, Tn21 and Tn501. Through transpositional recombination, this protein generates the formation of co-integrates between both donor and target replicons, with duplication of Tn4
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11. PhaQ, a New Class of Poly-β-Hydroxybutyrate (PHB)-Responsive Repressor, Regulates phaQ and phaP (Phasin) Expression in Bacillus megaterium through Interaction with PHB
Bacillus megaterium can produce poly-β-hydroxybutyrate (PHB) as carbon and energy storage materials. We now report that the phaQ gene, which is located upstream of the phasin-encoding phaP gene, codes for a new class of transcriptional regulator that negatively controls expression of both phaQ and phaP. A PhaQ binding site that plays a role in this control
American Society for Microbiology.
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12. Identification and cloning of a tetracycline resistance gene from the fish pathogen Vibrio salmonicida.
Vibrio salmonicida is the causative agent of cold-water vibriosis in farmed Atlantic salmon. We cloned a 6.9-kb PstI fragment from the 170-MDa plasmid (pRVS1) containing a tetracycline resistance determinant. A subcloned 1.96-kb HindIII fragment was found to mediate the tetracycline resistance. The 2.5-kb ClaI-PvuI fragment carrying the Tet E determinant fro