Deoxygenation
Mostrando 1-12 de 58 artigos, teses e dissertações.
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1. A practical approach to assess leg muscle oxygenation during ramp-incremental cycle ergometry in heart failure
Heart failure is characterized by the inability of the cardiovascular system to maintain oxygen (O2) delivery (i.e., muscle blood flow in non-hypoxemic patients) to meet O2 demands. The resulting increase in fractional O2 extraction can be non-invasively tracked by deoxygenated hemoglobin concentration (deoxi-Hb) as measured by near-infrared spectroscopy (NI
Braz J Med Biol Res. Publicado em: 02/10/2017
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2. Intercostal and forearm muscle deoxygenation during respiratory fatigue in patients with heart failure: potential role of a respiratory muscle metaboreflex
The purpose of this study was to determine the effect of respiratory muscle fatigue on intercostal and forearm muscle perfusion and oxygenation in patients with heart failure. Five clinically stable heart failure patients with respiratory muscle weakness (age, 66±12 years; left ventricle ejection fraction, 34±3%) and nine matched healthy controls underwent
Braz J Med Biol Res. Publicado em: 29/08/2014
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3. Osteoarticular involvement in sickle cell disease
The osteoarticular involvement in sickle cell disease has been poorly studied and it is mainly characterized by osteonecrosis, osteomyelitis and arthritis. The most frequent complications and those that require hospital care in sickle cell disease patients are painful vaso-occlusive crises and osteomyelitis. The deoxygenation and polymerization of hemoglobin
Revista Brasileira de Hematologia e Hemoterapia. Publicado em: 2012
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4. COEFICIENTES DE DESOXIGENAÇÃO E DE REAERAÇÃO SUPERFICIAL EM TRECHOS DO RIO VACACAÍ MIRIM / DEOXYGENATION AND REAERATION COEFFICIENTS ON VACACAÍ MIRIM RIVER REACHES
Esta dissertação apresenta a determinação experimental dos dois coeficientes mais importantes na modelagem do oxigênio dissolvido em corpos d‟água: o coeficiente de reaeração superficial K2, e o coeficiente de desoxigenação K1. O coeficiente de desoxigenação foi determinado em três seções representativas da bacia em estudo, sendo uma com
Publicado em: 2010
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5. An expeditious and consistent procedure for tetrahydrofuran (THF) drying and deoxygenation by the still apparatus
Despite the availability of alternative methods for drying tetrahydrofuran (THF), the use of the still apparatus, wherein a THF solution containing Na-bezophenone ketyl is heated to reflux, remains widespread. We herein propose a set of procedures to solve the problems usually faced in applying this drying technique. Moreover, a discussion is made on the che
Química Nova. Publicado em: 2009
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6. Atribuição Inequívoca dos Sinais de RMN de 1H e de 13C do Glaucolídeo B, Síntese de seus Derivados e Síntese de 2-Fenil-6,7-exo-Isopropilidenodioxi- 8-Oxabiciclo-[3.2.1]-Oct-2-eno, Visando a Obtenção de Novos Herbicidas
Considering the increasing need of new chemical products for the rational and efficient weeds control, it was conducted a research of new compounds provided with herbicide activity, as well as the study for unequivocal determination of Glaucolide B [1], structure a sesquiterpene lactone containing a cycle of ten members. For this, the Glaucolide B was isolat
Publicado em: 2008
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7. Estudo da desoxigenação do produto de craqueamento catalítico de óleo de mamona (Ricinus communis) na presença de diversos catalisadores
The purely thermal cracking of castor oil produces a mixture of compounds with unsatisfactory fuel properties, as high viscosity, high acid value and low cetane index. This low quality is associated with high value of oxygenated products in obtained product composition. The aim of this work was to improve the physical-chemical properties of cracking product
Publicado em: 2007
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8. Estudo do efeito da presença de alumina dopada com TiO2 e ZrO2 no craqueamento do óleo de soja
The catalytic cracking of triglycerides presents itself as a possible alternative to the production of biofuels with low emission of pollutants. In this work a study of the use of solids, constituted by mixed oxides of Ti, Zr and Al, as catalysts for the cracking reaction of soybean oil is presented. The study involves, after a large bibliographic review abo
Publicado em: 2006
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9. Desoxigenação de metanol com monoxido de carbono catalisada por compostos de metais de transição
The catalytic effect of transition metal compounds in the presence of base has been studied for the deoxygenation of methanol with carbon monoxide. The compounds Mo(CO)6, Ni(acac)2, Mn(acac)2, Fe(CO)5, RhCl3.3H2O, Rh2Cl2(CO)4, RuCl3 and CO2 (CO)8 were used as catalyst precursors. Gas chromatographic analysis of the gas and liquid reaction products show hydro
Publicado em: 1991
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10. Sickle-cell hemoglobin: fall in osmotic pressure upon deoxygenation.
Macromolecules such as hemoglobin exert both kinetic and matrix effects on osmotic pressure. The kinetic osmotic pressure of sickle-cell hemoglobin is lost upon deoxygenation at physiological erythrocyte concentrations. The non-kinetic or matrix component of osmotic pressure remains relatively unchanged. Loss of thermal-osmotic activity during deoxygenation
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11. Effects of deoxygenation on active and passive Ca2+ transport and cytoplasmic Ca2+ buffering in normal human red cells.
1. The effects of deoxygenation on cytoplasmic Ca2+ buffering, saturated Ca2+ extrusion rate through the Ca2+ pump (Vmax), passive Ca2+ influx and physiological [Ca2+]i level were investigated in human red cells to assess whether or not their Ca2+ metabolism might be altered by deoxygenation in capillaries and venous circulation. 2. The study was performed i
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12. The influence of deformation of transformed erythrocytes during flow on the rate of oxygen release.
The deoxygenation rates of transformed erythrocytes were compared with those of normal discocytes by both stopped-flow and continuous-flow methods. Echinocytic and spherostomatocytic transformations were induced by various anionic and cationic drugs, respectively, without altering the oxygen affinity of haemoglobin, the cell volume or the membrane fluidity.