Valency
Mostrando 13-24 de 50 artigos, teses e dissertações.
-
13. Estrutura local em manganitas por espectroscopia de absorção de raios-X
Transition metal oxides with perovskite structure ABO3, exhibit large diversity of interesting physical properties and have recently been the subject of a great number of studies. The manganites, AMnO3, in particular, may exhibit colossal magneto-resistance, a phenomenon strongly related to the formal valency of the Mn ions and to structural local order arou
Publicado em: 2004
-
14. THE RELATIONSHIPS BETWEEN VERBS OF MOVEMENT AND THEIR LOCATIVE COMPLEMENTS OF ORIGEN AND GOAL ACCORDING TO THE VALENCY GRAMMAR APROACH / AS RELAÇÕES ENTRE VERBOS DE MOVIMENTO E COMPLEMENTOS LOCATIVOS DE ORIGEM E META COM ENFOQUE DA GRAMÁTICA DE VALÊNCIAS
Na descrição do português do Brasil, as expressões adverbiais locativas de origem e de meta, exigidas pela valência de verbos de movimento tetravalentes, apresentam peculiaridades quanto à realização nos enunciados. Neste trabalho, a análise realizada é de caráter qualitativo, com base nas propostas da gramática de valências. Examina a possibili
Publicado em: 2002
-
15. Reflexões, isometrias e arvores
We define a reflection in a graph as an involutive automorphism whose set of fixed points is a complete geodesic. Using this concept, we prove that the product of two such reflections is an eliptic isometry if and only if its sets of fixed points has nonempty intersection. Moreover, for the case of a regular tree of valency 4k, we prove that the topological
Publicado em: 2002
-
16. As derivadas de momento dipolar e as intensidades vibracionais dos difluoroetilenos
Using the F and G intensity sum rules, the absolute vibrational intensities measured by Kagel for vic-, cis-, and trans-C2HxD2-xF2 (x = 1, 2) are found to be free of large systematic experimental error. Preferred values for the dipole moment derivatives with respect to the symmetry coordinates of these molecules based on approximate semiempirical MO results
Publicado em: 1979
-
17. Disrupting integrin transmembrane domain heterodimerization increases ligand binding affinity, not valency or clustering
Residues important in the interaction between the 23-residue transmembrane (TM) domains of the integrin αIIb- and β3-subunits were identified by mutating each non-Leu residue to Leu. Leu substitutions of αIIb at G972, G976, and T981, and of β3 at I693 and G708, increased ligand binding. Substitutions with other amino acids at αIIbG972 and β3G708 could
National Academy of Sciences.
-
18. Valency of Antibody Binding to Enveloped Virus Particles as Determined by Surface Plasmon Resonance
A simple method is described for determining the valency of binding of immunoglobulin G to immobilized influenza A virus. Where there is a free Fab arm (monovalent binding), a second virus particle is captured. This is detected by surface plasmon resonance. The methodology should be applicable to all enveloped and nonenveloped viruses.
American Society for Microbiology.
-
19. Quaternary structure dynamics and carbon monoxide binding kinetics of hemoglobin valency hybrids.
The kinetics of CO binding and changes in quaternary structure for symmetric valency hybrids of human hemoglobin have been extensively studied by laser photolysis techniques. Both alpha+beta and alpha beta+ hybrids were studied with five different ferric ligands, over a broad range of CO concentrations and photolysis levels. After full CO photolysis, the hyb
-
20. Roles of immunoglobulin valency and the heavy-chain constant domain in antibody-mediated downregulation of Sindbis virus replication in persistently infected neurons.
Clearance of infectious Sindbis virus from neurons is mediated by antibody to the E2 glycoprotein. Properties of the antibody important for downregulation of Sindbis virus replication are unknown. Immunoglobulin isotypes and valency determine many biological properties of antibodies. An immunoglobulin G1 (IgG1) isotype switch mutant and F(ab')2 and Fab fragm
-
21. Titration of Isolated Cell Walls of Lemna minor L 1
A theoretical model has been built to bypass the equation of titration of the cell wall. This equation, which is an extension of the Henderson-Hasselbach equation, underlines the importance of the exchange constant, the ionic strength as well as the rate of neutralization. The model is restricted to the case when the ionization degree is equal to the neutral
-
22. Direct observation of brownian motion of lipids in a membrane.
Nanovid microscopy, which uses 30- to 40-nm colloidal gold probes combined with video-enhanced contrast, can be used to examine random and directed movements of individual molecules in the plasma membrane of living cells. To validate the technique in a model system, the movements of lipid molecules were followed in a supported, planar bilayer containing fluo
-
23. Structure of Hemoglobin M Boston, a Variant with a Five-Coordinated Ferric Heme
X-ray analysis of the natural valency hybrid α2+M Bostonβ2deoxy shows that the ferric iron atoms in the abnormal α subunits are bonded to the phenolate side chains of the tyrosines that have replaced the distal histidines; the iron atoms are displaced to the distal side of the porphyrin ring and are not bonded to the proximal histidines. The resulting cha
-
24. Nuclear magnetic resonance study of heme-heme interaction in hemoglobin M Milwaukee: implications concerning the mechanism of cooperative ligand binding in normal hemoglobin.
Hemoglobin M Milwaukee (beta 67E11 val leads to Glu) is a naturally occurring valency hybrid containing two permanently oxidized hemes in the beta-chains. In this mutant, the two abnormal beta-chains cannot combine with oxygen, whereas the two alpha-chains are normal and can combine with oxygen cooperatively with a Hill coefficient of approximately 1.3. High