Lt Codes
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. LT CODES VARIATIONS / VARIAÇÕES SOBRE CÓDIGOS LT
A construção de novos códigos através de modificações (alongamento, puncionamento, etc) de um código conhecido é uma prática comum quando se lida com códigos clássicos. Neste trabalho é mostrado que bons códigos podem ser obtidos com algumas dessas técnicas, aparentemente não efetivas aos códigos fontanais. Os Códigos LT (Luby Transform) Sis
Publicado em: 2010
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2. BIDIMENSIONAL FOUNTAIN CODES FOR ERASURE CHANNELS / CÓDIGOS FONTANAIS BIDIMENSIONAIS PARA CANAIS COM APAGAMENTO
Fountain Codes (LT Codes and Raptor Codes) are a class of codes proposed to efficient and reliably transmit data through Erasure Channels. LT Codes and Raptor Codes are a good approximation to the concept of digital fountain and as such are named as fountain codes. They are said to be rateless codes in the sense that the number of symbols produced by the enc
Publicado em: 2008
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3. Study of a class of rateless codes for data transmission over erasure channels / Estudo de uma classe de cÃdigos sem-taxa para transmissÃo de dados em canais com apagamento
Erasure channels have been extensively used as appropriate models for data transmission over packet based communication networks, which have the Internet as its most notable example. The research on codes capable of dealing with erasures, guaranteeing reliability and efficiency on the utilization of such channels, has been the subject of much research on com
Publicado em: 2007
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4. Characterization of bovine respiratory syncytial virus isolated in Brazil
This paper presents the first isolation of bovine respiratory syncytial virus in Brazil and its physicochemical, morphological and molecular characterization. The virus was isolated from 33 samples of nasotracheal secretions, successively inoculated into a Madin-Darby bovine kidney cell culture, which was characterized by physicochemical tests and morphologi
Brazilian Journal of Medical and Biological Research. Publicado em: 2003-02
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5. Construction of a nontoxic fusion peptide for immunization against Escherichia coli strains that produce heat-labile and heat-stable enterotoxins.
The 5' terminus of the gene that codes for the heat-stable enterotoxin of Escherichia coli (ST) was genetically fused to the 3' terminus of the gene that codes for the binding subunit of the heat-labile enterotoxin of E. coli (LT-B). The ST-encoding gene used for these studies was constructed synthetically with appropriate restriction sites to permit in-fram
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6. In vivo induction of interleukin-12 mRNA expression after oral immunization with Salmonella dublin or the B subunit of Escherichia coli heat-labile enterotoxin.
Mice orally immunized with Salmonella dublin EL23, a nonreverting, aromatic-dependent, histidine-requiring mutant transformed with a plasmid which carries a gene that codes for production of the B subunit of the heat-labile toxin (LT-B) of enterotoxigenic Escherichia coli, or with purified LT-B alone were compared for their ability to initiate expression of
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7. Identification and initial characterization of the eutF locus of Salmonella typhimurium.
We report the isolation and initial characterization of mutations in the newly described eutF locus of Salmonella typhimurium LT2. Mutations in eutF render a strain unable to utilize ethanolamine as a source of carbon and/or energy and impair growth on ethanolamine as a sole nitrogen source. Strains carrying eutF mutations exhibit a 2-order-of-magnitude decr
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8. Nucleotide sequence and biochemical characterization of the metJ gene from Salmonella typhimurium LT2.
The nucleotide sequence of the Salmonella typhimurium metJ gene is presented along with the sequence of the promoter region for the closely linked metB gene. The two genes are transcribed in opposite directions, with transcription initiating from a single promoter for metB, and from two apparent promoters for metJ. RNA polymerase binding sites for metJ and m
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9. Identification of the Operon for the Sorbitol (Glucitol) Phosphoenolpyruvate:Sugar Phosphotransferase System in Streptococcus mutans
Transposon mutagenesis and marker rescue were used to isolate and identify an 8.5-kb contiguous region containing six open reading frames constituting the operon for the sorbitol P-enolpyruvate phosphotransferase transport system (PTS) of Streptococcus mutans LT11. The first gene, srlD, codes for sorbitol-6-phosphate dehydrogenase, followed downstream by srl
American Society for Microbiology.
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10. Cassette-like variation of restriction enzyme genes in Escherichia coli C and relatives
A surprising result of comparative bacterial genomics has been the large amount of DNA found to be present in one strain but not in another of the same species. We examine in detail one location where gene content varies extensively, the restriction cluster in Escherichia coli. This region is designated the Immigration Control Region (ICR) for the density an
Oxford University Press.
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11. Isolation of Salmonella typhimurium strains that utilize exogenous 3-deoxy-D-manno-octulosonate for synthesis of lipopolysaccharide.
Spontaneous mutants of Salmonella typhimurium LT2 were selected for the ability to accumulate exogenous 3-deoxy-D-manno-octulosonate (KDO). Bacteria containing a gene (kdsA) which codes for a temperature-sensitive KDO-8-phosphate synthetase were plated at the restrictive temperature of 42 degrees C on medium containing 5 mM KDO. Since bacteria containing the