Iron Redistribution
Mostrando 1-12 de 17 artigos, teses e dissertações.
-
1. Estudo morfológico e hidroquímico de pequenas depressões na Nhecolândia, Pantanal, MS / Morphological and hydrochemical study of small depressions in Nhecolândia, Pantanal, MS
The southern part of the Taquari alluvial fan, called Nhecolândia, is a sub-region of the Pantanal of Mato-Grosso exhibiting a complex of round shape lakes, draining fields, forested sandy areas, small watercourses and small depressions. Former studies have shown that the sub-superficial water fluxes depend on the intensity of the flood and on the presence
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/09/2012
-
2. Avaliação dos métodos de extração sequencial de Tessier, Keller e Miller na determinação de ferro nativo em três tipos de solos: orgânico, brunizem e latossolo
Sequential extraction is not totally effective to dissolve distinct forms of trace elements. The extractive solution, for example, can dissolve less of the target fraction and more than another not wished fraction. The goal of this work is to compare the extraction of native iron with three sequential extraction methods of the heavy metals, using three soils
Química Nova. Publicado em: 2003-05
-
3. Status avaliation in magnesium, iron, zinc, and copper in female water polo athletes of the pre-competitive,detrain, and maintenance periods / Avaliação do estado nutricional em magnésio, ferro, zinco e cobre de atletas de polo aquático feminino em períodos de treinamento pré-competitivo, de destreinamento e de treinamento de manutenção
The study evaluated the effect of training on the magnesium, iron, zinc, and copper nutritional status, in female water polo athletes of the Brazilian national team, considering the concentrations of ErMg2+ and SMg2+; ErZn2+ and SZn2+; Cu/Zn-SOD activity and SCu2+; Hb, FER and %TS in pre-competitive, detraining, and maintenance periods. The intakes of these
Publicado em: 2002
-
4. Effect of intravenous iron-dextran (Imferon) infusion on antigen induced monarticular arthritis in rabbits.
The effect of intravenously infused iron-dextran (Imferon) on the progression of antigen induced monarticular arthritis in rabbits was studied. A rapid deposition of iron and apoferritin in the synovia of arthritis joints occurred after infusion of iron-dextran during either the acute or chronic phases of the disease. This coincided with the appearance of ca
-
5. Mechanism of impaired iron release by the reticuloendothelial system during the hypoferremic phase of experimental Neisseria meningitidis infection in mice.
Hypoferremia, the reduction of plasma transferrin iron levels during infection, has been shown to control Neisseria meningitidis infection in mice. The exact nature of the mechanism that regulates this response has been obscure. We have previously shown that hypoferremia does not result from an accelerated removal of iron from the plasma transferrin pool. In
-
6. Ankylosing spondylitis: a chronic inflammatory disease with iron overload in granulocytes and platelets.
The cellular stores of iron in granulocytes and platelets isolated from 29 patients with ankylosing spondylitis were measured by the nuclear microprobe technique. The mean iron content in polymorphonuclear cells (PMNs) was 32 (SD 3) micrograms/g dry weight and in platelets 11 (2.6) micrograms/g dry weight. Corresponding values for age and sex matched healthy
-
7. Turnover in the transferrin iron pool during the hypoferremic phase of experimental Neisseria meningitidis infection in mice.
Mouse transferrin was used to specifically label the plasma transferrin iron pool for studies of iron kinetics in normal mice and infected mice during the hypoferremic phase of experimental meningococcal infection. The plasma transferrin iron pool of normal mice was found to be very dynamic, with a half-life of iron in the pool of 0.7 h. Iron left the plasma
-
8. Translation of ferritin light and heavy subunit mRNAs is regulated by intracellular chelatable iron levels in rat hepatoma cells.
Acute administration of iron to rats has been previously shown to induce liver ferritin synthesis by increasing the translation of inactive cytoplasmic ferritin mRNAs for both heavy (H) and light (L) subunits by mobilizing them onto polyribosomes. In this report rat hepatoma cells in culture are used to explore the relationship of this response to intracellu
-
9. Hemin inhibits internalization of transferrin by reticulocytes and promotes phosphorylation of the membrane transferrin receptor.
Addition of hemin to reticulocytes inhibits incorporation of iron from transferrin [Ponka, P. & Neuwirt, J. (1969) Blood 33, 609-707]. Heme also regulates protein synthesis in immature erythroid cells through its effects on phosphorylation of the initiation factor eIF-2. We have therefore examined its effects on endocytosis of iron-transferrin and phosphoryl
-
10. Rapid mRNA degradation mediated by the c-fos 3' AU-rich element and that mediated by the granulocyte-macrophage colony-stimulating factor 3' AU-rich element occur through similar polysome-associated mechanisms.
The different 3' noncoding AU-rich elements (ARE) that mediate the degradation of many short-lived mRNAs may function through distinct decay pathways; translation-dependent and -independent mechanisms have been proposed. To investigate the cotranslational model, we designed an expression system that exploits the properties of the ferritin iron-responsive ele
-
11. Comparison of the iron proteins from the nitrogen fixation complexes of Azotobacter vinelandii, Clostridium pasteurianum, and Klebsiella pneumoniae
The molecular weights, amino acid compositions, amino- and carboxyl-terminal sequences, and ion-exchange peptide maps of the cysteine-containing tryptic peptides were determined for the iron proteins from the nitrogen fixation complexes of Azotobacter vinelandii (Av2) and Klebsiella pneumoniae (Kp2). Our results are compared to the known amino acid sequence
-
12. Subcellular localization of yeast ribonucleotide reductase regulated by the DNA replication and damage checkpoint pathways
The fidelity of DNA replication and repair processes is critical for maintenance of genomic stability. Ribonucleotide reductase (RNR) catalyzes the rate-limiting step in dNTP production and thus plays an essential role in DNA synthesis. The level and activity of RNR are highly regulated by the cell cycle and DNA damage checkpoints, which maintain optimal
National Academy of Sciences.