Amino Acid Transport Systems
Mostrando 1-12 de 232 artigos, teses e dissertações.
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1. Dietary protein effects on growth performance, carcass traits and expression of selected jejunal peptide and amino acid transporters in broiler chickens
The effect of dietary protein on growth, carcass traits and some specific intestinal intestinal peptide and amino acid transporters in broiler chickens was studied. Birds received a common pre-test diet, and were subsequently fed either a standard positive control diet (PC) or a reduced CP diet (RCP) from 21 to 42 d of age. Growth was negatively impacted wit
Revista Brasileira de Ciência Avícola. Publicado em: 2011-06
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2. Boron transport in Eucalyptus. 2. Identification in silico of a putative boron transporter for xylem loading in eucalypt
Boron (B) is a low mobility plant micronutrient whose molecular mechanisms of absorption and translocation are still controversial. Many factors are involved in tolerance to Boron excess or deficiency. Recently, the first protein linked to boron transport in biological systems, BOR1, was characterized in Arabidopsis thaliana. This protein is involved in boro
Genetics and Molecular Biology. Publicado em: 2005
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3. Multidrug efflux systems in Gram-negative bacteria
Multidrug efflux mechanisms in bacteria contribute significantly to intrinsic and acquired resistance to antimicrobial agents. Genome analysis have confirmed the broad distribution of these systems in Gram-negative as well as in Gram-positive bacteria. Among resistance mechanisms, the multidrug efflux system or pump deserves special attention, since a cell t
Brazilian Journal of Microbiology. Publicado em: 2004-06
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4. Estudo comparativo de parâmetros elétricos na absorção de substratos Na+/H+-dependentes em epitélio jejunal e ileal de coelho em câmaras de ussing / Comparative study of electric parameters in the substratum absorption Na+/H+-dependentes in epitélio jejunal and ileal de coelho in Chambers of Ussing
A cólera é uma doença que se tornou endêmica no Nordeste do Brasil após a pandemia iniciada no Peru em 1991. A toxina do Vibrio cholerae (TC) causa potente ação secretória no intestino delgado, podendo levar a desequilíbrio hidro-eletrolítico e choque hipovolêmico nos pacientes com cólera. Postulamos que a administração de substratos, tais como
Publicado em: 2002
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5. Amino acid transport systems required for diazotrophic growth in the cyanobacterium Anabaena sp. strain PCC 7120.
Uptake of 16 amino acids by the filamentous, heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120 was characterized with regard to kinetic parameters of transport, intracellular accumulation of the transported amino acids, and sensitivity of the transport process to energy metabolism inhibitors. Mutants resistant to certain toxic analogs of some am
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6. Carrageenin-induced arthritis. VI. Alterations in amino acid transport by articular cartilage in acute inflammatory arthritis.
The mechanism of transport of alanine and aminoisobutyric acid into chondrocytes in rabbit articular cartilage was shown to be mediated by transport systems similar to that described for other eukaryotic cells namely the A, ASC, and L systems. Three days after the initiation of an acute inflammatory arthritis by the intra-articular injection of carrageenin i
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7. Maintenance and Exchange of the Aromatic Amino Acid Pool in Escherichia coli
The pool of phenylalanine, tyrosine, and tryptophan is formed in Escherichia coli K-12 by a general aromatic transport system [Michaelis constant (Km) for each amino acid approximately 5 × 10−7m] and three further transport systems each specific for a single aromatic amino acid (Km for each amino acid approximately 2 × 10−6m, reference 3). When the ext
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8. Regulation of aromatic amino acid transport systems in Escherichia coli K-12.
The regulation of the aromatic amino acid transport systems was investigated. The common (general) aromatic transport system and the tyrosine-specific transport system were found to be subject to repression control, thus confirming earlier reports. In addition, tryosine- and tryptophan-specific transport were found to be enhanced by growth of cells with phen
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9. Active transport of amino acids in Thiobacillus thioparus is a low-affinity process.
A method for the isolation of amino acid auxotrophs of Thiobacillus thioparus is described. Characterization of a leucine auxotroph indicated that leucine biosynthesis in T. thioparus was not different from that of heterotrophic bacteria. T. thioparus cells accumulated amino acids via an active mechanism. Kt values of amino acid transport were between 15 and
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10. Role of transport systems in amino acid metabolism: leucine toxicity and the branched-chain amino acid transport systems.
The livR locus, which leads to a trans-recessive derepression of branched-chain amino acid transport and periplasmic branched-chain amino acid-binding proteins, is responsible for greatly increased sensitivity toward growth inhibition by leucine, valine, and serine and, as shown previously, for increased sensitivity toward toxicity by branched-chain amino ac
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11. Genetic analysis of amino acid transport in the facultatively heterotrophic cyanobacterium Synechocystis sp. strain 6803.
The existence of active transport systems (permeases) operating on amino acids in the photoautotrophic cyanobacterium Synechocystis sp. strain 6803 was demonstrated by following the initial rates of uptake with 14C-labeled amino acids, measuring the intracellular pools of amino acids, and isolating mutants resistant to toxic amino acids. One class of mutants
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12. Characterization of neutral amino acid transport in a marine pseudomonad.
The transport of neutral amino acids in marine pseudomonad B-16 (ATCC 19855) has been investigated. From patterns of competitive inhibition, mutant analysis, and kinetic data, two active transport systems with overlapping substrate specificities were distinguished and characterized. One system (DAG) served glycine, D-alanine, D-serine, and alpha-aminoisobuty