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Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Um estudo do aumento da capacidade de sistemas 3g WCDMA usando técnicas 3.5G de expansão do enlace reverso
A introdução de novos serviços digitais nas redes celulares, em taxas de transmissão cada vez mais elevadas, tem impulsionado recentes pesquisas que vêm estudando maneiras de aumentar a capacidade de transmissão de dados e diminuir os atrasos nos enlaces direto e reverso de sistemas de terceira geração WCDMA. Esses estudos têm resultado em novos pad
Publicado em: 2005
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2. U2 region of Epstein-Barr virus DNA may encode Epstein-Barr nuclear antigen 2.
Sequence analysis of the U2 regions of the B95-8 and AG876 Epstein-Barr virus (EBV) isolates reveals divergence within a long open reading frame previously identified as encoding 1.5 kilobases of the 3' end of a viral RNA expressed in latently infected, growth-transformed, B-lymphocyte cell lines. Differences among EBV isolates within the U2 open reading fra
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3. The GTS1 gene, which contains a Gly-Thr repeat, affects the timing of budding and cell size of the yeast Saccharomyces cerevisiae.
A gene with an open reading frame encoding a protein of 417 amino acid residues with a Gly-Thr repeat was isolated from the yeast Saccharomyces cerevisiae by using synthetic oligonucleotides encoding three Gly-Thr dimers as probes. The deduced amino acid sequence showed partial homology to the clock-affecting gene, per, of Drosophila melanogaster in the regi
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4. An analysis of 5'-noncoding sequences from 699 vertebrate messenger RNAs.
5'-Noncoding sequences have been compiled from 699 vertebrate mRNAs. (GCC) GCCA/GCCATGG emerges as the consensus sequence for initiation of translation in vertebrates. The most highly conserved position in that motif is the purine in position -3 (three nucleotides upstream from the ATG codon); 97% of vertebrate mRNAs have a purine, most often A, in that posi
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5. Molecular characterization of the testis specific c-abl mRNA in mouse.
The c-abl gene encodes a protein tyrosine kinase and is transcribed from at least two promoters giving rise to transcripts of two size classes of approximately 5 and 6 kb in length. These mRNAs only differ in their most 5' exon and encode proteins of similar size but with different N-termini. In the mouse testis an additional abundant c-abl mRNA of 4 kb is d
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6. Nucleotide sequence and analysis of the coliphage T3 S-adenosylmethionine hydrolase gene and its surrounding ribonuclease III processing sites.
To understand better the characteristics of the coliphage T3 S-adenosyl-L-methionine (AdoMet) hydrolase (AdoMetase, E.C. 3.3.1.2) and its expression in phage-infected Escherichia coli, we determined the DNA sequence of the cloned gene and its surrounding ribonuclease (RNase) III mRNA transcript processing sites. The AdoMetase gene contains two in-frame prote
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7. Molecular analysis of the linear 2.3 kb plasmid of maize mitochondria: apparent capture of tRNA genes.
The nucleotide sequence and transcription pattern of the linear 2.3 kb plasmid of maize mitochondria was analyzed in order to elucidate its possible function in the organelle. The plasmid has 170 bp inverted repeats at its termini composed, in turn, of shorter repetitive sequences. An open reading frame within the plasmid is transcribed and can potentially s
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8. Size and Sequence Polymorphism in the Isocitrate Dehydrogenase Kinase/Phosphatase Gene (Acek) and Flanking Regions in Salmonella Enterica and Escherichia Coli
The sequence of aceK, which codes for the regulatory catalytic enzyme isocitrate dehydrogenase kinase/phosphatase (IDH K/P), and sequences of the 5' flanking region and part or all of the 3' flanking region were determined for 32 strains of Salmonella enterica and Escherichia coli. In E. coli, the aceK gene was 1734 bp long in 13 strains, but in three strain
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9. Structure and polymorphism of the mouse prion protein gene.
Missense mutations in the prion protein (PrP) gene, overexpression of the cellular isoform of PrP (PrPC), and infection with prions containing the scrapie isoform of PrP (PrPSc) all cause neurodegenerative disease. To understand better the physiology and expression of PrPC, we retrieved mouse PrP gene (Prn-p) yeast artificial chromosome (YAC), cosmid, phage,
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10. Nucleotide sequence of transforming human c-sis cDNA clones with homology to platelet-derived growth factor.
Three c-sis cDNA clones were obtained from polyadenylated RNA of a human T-cell lymphotropic virus (HTLV) type I transformed cell line. Two clones, designated pSM-1 and pSM-2, have cDNA inserts of 2498 and 2509 base pairs (bp), respectively, excluding the sizes of the guanylate tails, and the polyadenylate tracts. These clones are shorter than the estimated
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11. Formal proof that different-size Lyt-2 polypeptides arise from differential splicing and post-transcriptional regulation.
We recently isolated the gene and a cDNA clone for the mouse T-cell surface antigen Lyt-2 and showed that Lyt-2 is homologous to the human Leu-2 (T8) antigen and that the gene encoding it is a member of the immunoglobulin gene superfamily. By screening a mouse thymus cDNA library with the Lyt-2 cDNA clone, we isolated two classes of cDNA clones, alpha and al
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12. Murine beta 1,4-galactosyltransferase: both the amounts and structure of the mRNA are regulated during spermatogenesis.
Previously we have shown that the gene encoding murine beta 1,4-galactosyltransferase (beta 1,4-GT; UDPgalactose:N-acetyl-D-glucosaminyl-glycopeptide 4-beta-D-galactosyltransferase, EC 2.4.1.38) is unusual in that it specifies two sets of mRNAs of about 3.9 and 4.1 kilobases (kb). Translation of the 3.9- and 4.1-kb mRNAs results in the predicted synthesis of