Ffh
Mostrando 1-12 de 35 artigos, teses e dissertações.
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1. Proposal of a New Approach for BER Evaluation of Multirate, Multiservice OCDMA Systems (Proposta de uma nova abordagem para o cálculo da BER de sistemas OCDMA de Múltiplas taxas e multiserviços)
A contínua evolução da tecnologia de comunicações ópticas observada nos últimos anos vem possibilitando atender a crescente demanda dos usuários por maior largura de banda. Esta nova demanda é atribuída principalmente à popularidade crescente de aplicações de banda larga, tais como TV por protocolo de Internet (IPTV), televisão de alta definiç
Publicado em: 06/04/2013
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2. Proposal of a new approach for BER evaluation of multirate, multiservice OCDMA systems / Proposta de uma nova abordagem para o cálculo da BER de sistemas OCDMA de múltiplas taxas e multiserviços
The continuous evolution of the optical communication technology in the last few years has allowed the growing users demand for higher bandwidth to be satisfactorily attended. This new demand is mainly attributed to the growing popularity of bandwidth-intensive networking applications, such as Internet protocol television (IPTV), high-definition television (
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/08/2012
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3. Stromal myofibroblasts in focal reactive overgrowths of the gingiva
Focal reactive overgrowths are among the most common oral mucosal lesions. The gingiva is a significant site affected by these lesions, when triggered by chronic inflammation in response to microorganisms in dental plaque. Myofibroblasts are differentiated fibroblasts that actively participate in diseases characterized by tissue fibrosis. The objective of th
Brazilian Oral Research. Publicado em: 21/06/2012
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4. A dívida líquida do setor público no Brasil pós-real : uma interpretação keynesiana
The public sector¿s net debt in Brazil has showed a remarkable growth in Brazil since 1995, immediately after the period in which the monetary stability, based on Real, became a reality. What are the determinants of the public debt¿s during the Brazilian Real era? Providing an answer for this question is the main objective of this thesis. In order to achie
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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5. Iterative decoding of q-ary turbo-product codes in FFH-CDMA systems / Decodificação iterativa de codigos turbo-produto q-arios em um Canal FFH-CDMA
This work presents a study of q-ary turbo decoding applied to FFH-CDMA systems. To attain the main objective of this dissertation, an algorithm to implement the q-ary soft decoding was designed. Specifically, an adaptation of the Chase decoding method was proposed to comply with q-ary symbols requirements. The proposal of iterative (turbo) decoding makes pos
Publicado em: 2007
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6. Sistemas FFH-CDMA codificados
Neste trabalho é desenvolvido um estudo sobre um sistema FFH-CDMA cujo receptor de máxima verossimilhança (MV) não-quantizado necessita de uma não-linearidade de difícil implementação. Para um sistema FFH-CDMA não-codificado propomos a utilização de um único perceptron para a implementação da não-linearidade. Esta proposta demonstrou apresenta
Publicado em: 2002
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7. Concentrations of 4.5S RNA and Ffh protein in Escherichia coli: the stability of Ffh protein is dependent on the concentration of 4.5S RNA.
We measured the concentrations of both 4.5S RNA and Ffh protein under a variety of growth conditions and found that there were 400 molecules of 4.5S RNA per 10,000 ribosomes in wild-type cells and that the concentration of Ffh protein was one-fourth of that. This difference in concentration is 1 order of magnitude less than that previously reported but still
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8. Methionine sulfoxide reductases protect Ffh from oxidative damages in Escherichia coli
In proteins, methionine residues are primary targets for oxidation. Methionine oxidation is reversed by methionine sulfoxide reductases A and B, a class of highly conserved enzymes. Ffh protein, a component of the ubiquitous signal recognition particle, contains a methionine-rich domain, interacting with a small 4.5S RNA. In vitro analyses reported here show
Nature Publishing Group.
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9. Cloning and characterization of a Bacillus subtilis gene encoding a homolog of the 54-kilodalton subunit of mammalian signal recognition particle and Escherichia coli Ffh.
By using a DNA fragment of Escherichia coli ffh as a probe, the Bacillus subtilis ffh gene was cloned. The complete nucleotide sequence of the cloned DNA revealed that it contained three open reading frames (ORFs). Their order in the region, given by the gene product, was suggested to be ORF1-Ffh-S16, according to their similarity to the gene products of E.
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10. Functional Analysis of the Signal Recognition Particle in Escherichia coli by Characterization of a Temperature-Sensitive ffh Mutant
The Ffh protein of Escherichia coli is a 48-kDa polypeptide that is homologous to the SRP54 subunit of the eukaryotic signal recognition particle (SRP). Efforts to understand the function of Ffh in bacteria have depended largely on the use of E. coli strains that allow depletion of the wild-type gene product. As an alternative approach to studying Ffh, a tem
American Society for Microbiology.
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11. Functional substitution of the signal recognition particle 54-kDa subunit by its Escherichia coli homolog.
The 54-kDa subunit of the mammalian signal recognition particle (SRP54) binds to the signal sequences of nascent secretory and transmembrane proteins and facilitates their cotranslational targeting to the membrane translocation apparatus in the endoplasmic reticulum (ER). A 48-kDa Escherichia coli protein that shares extensive sequence similarity with SRP54
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12. Evidence for a novel GTPase priming step in the SRP protein targeting pathway
Protein targeting by the signal recognition particle (SRP) pathway requires the interaction of two homologous GTPases that reciprocally regulate each other’s GTPase activity, the SRP signal peptide- binding subunit (SRP54) and the SRP receptor α-subunit (SRα). The GTPase domain of both proteins abuts a unique ‘N domain’ that appears to facilitate ex
Oxford University Press.