Paramagnetism
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Studies of the magnetic properties on Mn-doped GaAs and Zn1-xCoxO thin films / Estudos das propriedades magneticas dos filmes finos de GaAs diopado com Mn e de Zn1-xCoxO
Ferromagnetic semiconductors (FM) are compounds of technological interest due to the possibility of combining their charge and spin degrees of freedom when producing electronic devices. In particular, semiconductor thin films doped with transition metal have become focus of intense scientific investigation since ferromagnetism with reasonably high Curie temp
Publicado em: 2007
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2. "Um biossusceptômetro supercondutor AC para quantificar o ferro hepático". / A Superconductor AC Susceptometer to Quantify Liver Iron.
This work consisted in the development of a system to measure the magnetization of large paramagnetic and diamagnetic samples. The main application was susceptometric measurements of the hepatic tissue for quantification of the iron overload. Iron excess is commonly observed in thalassemic and sickle cell anemia patients who have repeatedly received red bloo
Publicado em: 2001
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3. Estrutura eletronica das melaninas
Melanin?s form a class of biological pigments which presents photoprotection as its basic function and amorphous semiconductor features. Though the structure and composition of these pigments are not well characterized, there is no doubt 5,6,indolquinone (lQ) is the most important monomer related to them. In this work we have studied the electronic structure
Publicado em: 1989
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4. Reexamination of the evidence for paramagnetism in oxy- and carbonmonoxyhemoglobins.
Experiments have been carried out in an attempt to confirm previous reports of paramagnetism in the oxy- and carbonmonoxy derivatives of human and carp hemoglobin. When care is taken to ensure complete saturation of the hemoglobins with ligand and the diamagnetic contributions of all of the buffers are carefully evaluated, these hemoglobin derivatives are fo
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5. LIGHT-INDUCED PARAMAGNETISM IN CHLOROPLASTS*
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6. Variability of the magnetic moment of carbon monoxide hemoglobin from carp.
Deionized carp carbon monoxide hemoglobin in distilled water or in bis(2-hydroxyethyl)imino-tris(hydroxymethyl)methane or Tris buffer exhibits a slight but significant paramagnetism. This is most clearly demonstrated by the decrease in this paramagnetism that is caused by the addition of inositol hexaphosphate to this protein in the former buffer at pH 6.3-6
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7. Magnetic susceptibility of oxy- and carbonmonoxyhemoglobins.
The room temperature magnetic susceptibilities of human and carp oxy- and carbonmonoxyhemoglobin solutions were measured in a 30-gauss (1 G = 10(-4) T) field with a superconducting magnetometer. To within experimental uncertainty, the susceptibility was the same for both the oxy and carbonmonoxy forms, and salt concentration did not effect it. A variety of s
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8. Proton Magnetic Resonance Studies of Chromatium High-Potential Iron Protein
Contact-shifted nuclear magnetic resonances, arising from molecular paramagnetism, have been observed in both reduced and oxidized forms of the high-potential iron protein (HiPIP) isolated from Chromatium. Contact shifts of the reduced, formally diamagnetic form increase with temperature, indicating antiferromagnetic exchange coupling of the component iron a
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9. Magnetic susceptibility studies of laccase and oxyhemocyanin.
The magnetic susceptibility of Rhus vernicifera laccase has been remeasured over the temperature range 5-260 K. In contrast to our previous results [Solomon, E.I., Dooley, D. M., Wang R.-H., Gray, H.B., Cerdonio, M., Mogno, F. & Romani, G. L. (1975) J. Am. Chem. Soc. 98, 1029-1031] linear chi versus T-1 behavior was observed. The susceptibility of Limulus po
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10. Metal thiolate clusters in cobalt(II)-metallothionein.
Rabbit liver metallothionein-1 in which all seven metal-binding sites are occupied by cobalt(II) exhibits spectral features typical of tetrathiolate coordination with approximate Td microsymmetry [Vasák, M. (1980) J. Am. Chem. Soc. 102, 3953-3955]. With a total of 20 cysteine residues per molecule, this mode of metal binding implies that some of the thiolat