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Search Results: 1 - 10 of 194321 matches for " Jose Ricardo de; "
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Pressure- and Urea-Induced Denaturation of Bovine Serum Albumin: Considerations about Protein Heterogeneity  [PDF]
Douglas Ricardo Norberto, Joelma Mauricio Vieira, Ancelmo Rabelo de Souza, Jose Ailton Conceicao Bispo, Carlos Francisco Sampaio Bonafe
Open Journal of Biophysics (OJBIPHY) , 2012, DOI: 10.4236/ojbiphy.2012.21002
Abstract: Urea denatures proteins at different concentrations, depending on the experimental conditions and the protein. We in-vestigated the pressure-induced denaturation of bovine serum albumin (BSA) in the presence of subdenaturing concen-trations of urea based on a two-state equilibrium. Pressure-induced denaturation was enhanced at urea concentrations ([U]) of 3.5 M to 8.0 M, with the free energy of denaturation at atmospheric pressure ranging from +5.0 to –2.5 kJ/mol of BSA. The m values appeared to be biphasic, with m1 and m2 of 0.92 and 2.35 kJ mol–1?M–1, respectively. Plots of versus ln[U] yielded values of u, the apparent stoichiometric coefficient, of 1.68 and 6.67 mol of urea/mol of BSA for m1 and m2, respectively. These values were compared with the m and u values of other monomeric proteins reported in or calculated from the literature. The very low values of u systematically observed for proteins were suggestive of heterogeneity in the free energy of denaturation. Thus, a u value of 140 mol of urea/mol of BSA may indicate the existence of a heterogeneous molecular population with respect to the free energy of dena-turation.
Exchange Rates, Macroeconomic Fundamentals and Risk Aversion  [PDF]
Ricardo Laborda, Jose Olmo
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.46047
Abstract:

This paper proposes a theoretical model for determining the exchange rate based on the interaction between international bond markets with different maturities. The model accommodates the presence of risk premia between short- and long-term bonds. The difference in risk premium between international bond markets produces imbalances between their yields and is responsible for the differences in equilibrium between the future spot exchange rate and the corresponding forward price. These departures from the expectations hypothesis of the international term structure of interest rates lead to unintended effects on the efficacy of monetary policy in open economies. The existence of imbalances in the risk premium between countries can be considered by monetary authorities as an alternative tool for conducting monetary policy and boosting real output.

Traumatismo torácico: estudo retrospectivo de 168 casos
Cuba, Ricardo Mauricio Batista Feitosa;Bezerra, Jose Antonio Ferreira de;
Revista do Colégio Brasileiro de Cirurgi?es , 2005, DOI: 10.1590/S0100-69912005000200002
Abstract: background: our objective is to study thoracic trauma cases treated in a public hospital. methods: a retrospective study of 168 cases of thoracic trauma, enphasizing the initial approach, surgical and postoperative care. results: of 168 patients, 120 were males with an avarage age of 35.5 years. ten patients underwent thoracotomy as an emergency procedure: four heart wounds, four lung vessels lesions, one pericardial sac injury and one lesion of the lung hilum. the others had their clinical conditions resolved through thoracic drainage. there were two non surgical deaths and one death due to breathing failure. conclusions: thoracic trauma is still frequent, and the majority of cases are simple. on the othem hand some will require surgical skill and a high level support hospital.
Early Osseous Tissue Formation Associated to Submerged and Non-Submerged Dental Implants: A Histomorphometric Animal Study
Olate,Sergio; Chaves Netto,Henrique Duque de Miranda; Mazzonetto,Renato; Albergaria-Barbosa,Jose Ricardo de;
International Journal of Morphology , 2012, DOI: 10.4067/S0717-95022012000100023
Abstract: the purpose of this research was to compare the bone formation around submerged and non-submerged implants installed in a mandible of dog. seven beagle dogs were used in this protocol; initially, was performed extraction of posterior teeth of mandible and after 3 month healing were installed two dental implants with surface treatment (subtraction of titanium via acidification) in each hemimandible. a transmucosal healing screw of 7 mm without oclusal contact was installed at the anterior implant as a model of non-submerged implant; in the posterior implant were installed a cover screw, using the submerged technique. after six weeks of healing, histomorphometric analysis of osseous tissue between the threads was performed. was analyzed the implant unit as well as the cervical, meddle and apical region of implant. student t test with 5% significance was used. the non-submerged implant model showed more bone formation than submerged implant without statistically significance (p=0.106); for regional analyses, cervical area shows more osseous formation than middle and apical areas. the regional analyses did not present statistical difference between areas for comparative analysis of submerged and non-submerged implant model. non-submerged implant model it's not an obstacle for osseous formation.
Recuperación ósea en Procedimientos de Reconstrucción y Colocación de Implantes
Olate,Sergio; de Oliveira,Greison Rabelo; Jaimes,Miguel; Barbosa,Jose Ricardo de Albergaria-;
International Journal of Morphology , 2007, DOI: 10.4067/S0717-95022007000300030
Abstract: implantology had experienced a rapid evolution in the last 30 years and the use of biomaterials on tissue recuperation has been more frequent; for this reason it is necessary to know the repaired process and histological reaction between the hosted tissue and the biomaterials, thereby determining the success of the therapy in the long time. clinically, it has been to possible to see the effects of different biomaterials, but after an histological analyses, has been demonstrated some variations that make them unaccepted for dental treatment. the aim of this review is to report the way of the bone cicatrisation with different biomaterials and the form in which it is developed this cicatrisation on the rehabilitation with implants with different load protocols
Recuperación ósea en Procedimientos de Reconstrucción y Colocación de Implantes Osseous Recovery in Implant Insertion and Pre Implant Reconstructions
Sergio Olate,Greison Rabelo de Oliveira,Miguel Jaimes,Jose Ricardo de Albergaria- Barbosa
International Journal of Morphology , 2007,
Abstract: La implantología ha evolucionado rápidamente en los últimos 40 a os y el empleo de biomateriales en la recuperación de tejidos es cada vez más frecuente. Por esta razón, es necesario conocer el proceso de reparación y la reacción producida entre los los tejidos huéspedes y los biomateriales a nivel histológico, ya que ello contribuirá al éxito, en el largo plazo, de los tratamiento rehabilitadores. Clínicamente, se ha podido observar la efectividad de diferentes compuestos, pero cuando han sido analizados histológicamente, han demostrado algunas variaciones que, muchas veces, las hacen inaceptables para la terapia odontológica. Los objetivos de esta revisión es conocer la forma en que se produce la cicatrización ósea en torno a diferentes biomateriales y como se desarrolla la cicatrización ósea en rehabilitación sobre implantes con diferentes protocolos de carga Implantology had experienced a rapid evolution in the last 30 years and the use of biomaterials on tissue recuperation has been more frequent; for this reason it is necessary to know the repaired process and histological reaction between the hosted tissue and the biomaterials, thereby determining the success of the therapy in the long time. Clinically, it has been to possible to see the effects of different biomaterials, but after an histological analyses, has been demonstrated some variations that make them unaccepted for dental treatment. The aim of this review is to report the way of the bone cicatrisation with different biomaterials and the form in which it is developed this cicatrisation on the rehabilitation with implants with different load protocols
Early Osseous Tissue Formation Associated to Submerged and Non-Submerged Dental Implants: A Histomorphometric Animal Study Formación Temprana de Tejido óseo Asociado a Implantes Dentales Sumergidos y no Sumergidos: Un Estudio Histomorfométrico Animal
Sergio Olate,Henrique Duque de Miranda Chaves Netto,Renato Mazzonetto,Jose Ricardo de Albergaria-Barbosa
International Journal of Morphology , 2012,
Abstract: The purpose of this research was to compare the bone formation around submerged and non-submerged implants installed in a mandible of dog. Seven beagle dogs were used in this protocol; initially, was performed extraction of posterior teeth of mandible and after 3 month healing were installed two dental implants with surface treatment (subtraction of titanium via acidification) in each hemimandible. A transmucosal healing screw of 7 mm without oclusal contact was installed at the anterior implant as a model of non-submerged implant; in the posterior implant were installed a cover screw, using the submerged technique. After six weeks of healing, histomorphometric analysis of osseous tissue between the threads was performed. Was analyzed the implant unit as well as the cervical, meddle and apical region of implant. Student t test with 5% significance was used. The non-submerged implant model showed more bone formation than submerged implant without statistically significance (p=0.106); for regional analyses, cervical area shows more osseous formation than middle and apical areas. The regional analyses did not present statistical difference between areas for comparative analysis of submerged and non-submerged implant model. Non-submerged implant model it's not an obstacle for osseous formation. El objetivo de esta investigación fue comparar la formación ósea alrededor de implantes dentales sumergidos y no sumergidos instalados en mandíbula de perro. Siete perros Beagle fueron utilizados en este protocolo; inicialmente fueron realizadas las exodoncias de dientes posteriores de mandíbula y luego de 3 meses de recuperación fueron instalados dos implantes dentales con tratamiento de superficie en cada hemimandíbula (substracción de titanio vía acidificación). En el implante anterior fue instalado también un conector transmucoso de 7 mm sin contacto oclusal y en el implante posterior fue instalado el tornillo de cierre. Luego de 6 semanas de recuperación, se realizó un análisis histomorfométrico del tejido óseo presente entre las roscas. Se analizó el implante como unidad así como también sus sectores cervical, medio y apical. Se utilizó la prueba estadística t de student con 5% de significancia estadística. El implante no sumergido presentó mayor formación ósea sin diferencias estadísticamente significativa (p=0.106); en los análisis regionales, el área cervical presentó mayor formación ósea que las áreas medianas y apicales. El análisis regional no presentó diferencias estadísticamente significativas entre ambos tipos de implante. El modelo de implante no sume
A Framework for Reproducible, Interactive Research: Application to health and social sciences
Joao Ricardo Nickenig Vissoci,Clarissa G. Rodrigues,Luciano de Andrade,Jose Eduardo Santana,Amrapali Zaveri,Ricardo Pietrobon
Computer Science , 2013,
Abstract: The aim of this article is to introduce a reporting framework for reproducible, interactive research applied to Big Clinical Data, based on open source technologies. The framework is constituted by the following three axes: (i) data, (ii) analytical codes and (iii) dissemination. In this paper, different documentation formats and online repositories are introduced. To integrate and manage the reproducible contents, we propose the R Language as the tool of choice. All the information is then published and gathered in a website for different projects. This framework is free and user friendly and is proposed to enhance reproducibility of health-science reports.
Estudo da associa??o entre fatores socioambientais e prevalência de parasitose intestinal em área periférica da cidade de Manaus (AM, Brasil)
Visser,Silvia; Giatti,Leandro Luiz; Carvalho,Ricardo Augusto Chaves de; Guerreiro,Jose Camilo Hurtado;
Ciência & Saúde Coletiva , 2011, DOI: 10.1590/S1413-81232011000900016
Abstract: this study assesses the association between socio-environmental factors and urban sanitation conditions with the prevalence of intestinal parasitosis in a community on the periphery of the city of manaus. the study comprised a socio-environmental survey and a parasitological inquiry. a heterogeneous community was revealed with some socio-economic and environmental differences between the micro-areas evaluated, even though the urban sanitation conditions were found to be predominantly precarious. the prevalance of intestinal parasitosis was 44.2%. there was no significant difference between the micro-areas that could explain the occurrence of intestinal parasitosis. an association was found between intestinal parasitosis and residential building types, age bracket and the quality of the water used for personal hygiene and consumption in the home. open air sewerage was a risk factor associated with intestinal parasitosis (or=6.72; p=0.034) and also with intestinal protozoa (or=21.87; p=0.004). in terms of the presence of protozoa, two risk factors were verified: the dumping of sewage directly into the river system (or=12.98; p=0.011) and the use of rudimentary cesspits (or=9.54; p=0.019).
Blood loss in the minimally invasive posterior approach to total hip arthroplasty: a comparative study
Vicente, Jose Ricardo Negreiros;Croci, Alberto Tesconi;Camargo, Olavo Pires de;
Clinics , 2008, DOI: 10.1590/S1807-59322008000300011
Abstract: aims: our primary aimwas to evaluate whether there is really less bleeding in patients for whom the minimally invasive posterior approach is used in comparison with the direct lateral approachfor primary total hip arthroplasty. our secondary aim was to evaluate the clinical functional results after six months as well as the postoperative radiographic result. methods: in a comparative non-random prospective study, 76 adult patients underwent elective total hip arthroplasty using one of two approaches. the minimally invasive posterior approach (34 cases; mini-incision group) was compared with the standard direct lateral approach (42 cases; control group). results: lower total estimated bleeding (means of 1083.5 ml versus 1682.3 ml; p < 0.001) and lower intraoperative bleeding (means of 745.6 ml versus 1282.8 ml; p < 0.001) were found in the mini-incision group. there was, however, no difference in the volume of blood drained after the operation (means of 340 ml and 399 ml; p = 0.77). there was also a difference between the two groups regarding the need for allogenic transfusion (8.8% in the mini-incision group versus 28.6%, p = 0.02). we observed a better clinical result in the mini-incision group (p = 0.002) despite the lack of difference between the two groups in relation to the radiographic result. discussion: our results draw attention to the possibility that other authors may have underestimated blood losses when using minimally invasive approaches. conclusion: the minimally invasive approach gave rise to a positive final impression with regard to lower blood loss.
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