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Search Results: 1 - 10 of 678083 matches for " Oliveira M. C. de "
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Teleportation of a Bose-Einstein condensate state by controlled elastic collisions
M. C. de Oliveira
Physics , 2002, DOI: 10.1103/PhysRevA.67.022307
Abstract: A protocol for teleportation of the state of a Bose-Einstein condensate trapped in a three-well potential is developed. The protocol uses hard-sphere cross-collision between the condensate modes as a means of generating entanglement. As Bell state measurement, it is proposed that a homodyne detection of the condensate quadrature is performed through Josephson coupling of the condensate mode to another mode in a neighbouring well.
On the P-representable subset of all bipartite Gaussian separable states
M. C. de Oliveira
Physics , 2004, DOI: 10.1103/PhysRevA.70.034303
Abstract: P-representability is a necessary and sufficient condition for separability of bipartite Gaussian states only for the special subset of states whose covariance matrix are $Sp(2,R)\otimes Sp(2,R)$ locally invariant. Although this special class of states can be reached by a convenient $Sp(2,R)\otimes Sp(2,R)$ transformation over an arbitrary covariance matrix, it represents a loss of generality, avoiding inference of many general aspects of separability of bipartite Gaussian states.
Characterization and quantification of symmetric Gaussian state entanglement through a local classicality criterion
M. C. de Oliveira
Physics , 2004, DOI: 10.1103/PhysRevA.72.012317
Abstract: A necessary and sufficient condition for characterization and quantification of entanglement of any bipartite Gaussian state belonging to a special symmetry class is given in terms of classicality measures of one-party states. For Gaussian states whose local covariance matrices have equal determinants it is shown that separability of a two-party state and classicality of one party state are completely equivalent to each other under a nonlocal operation, allowing entanglement features to be understood in terms of any available classicality measure.
Effects of Sea Level Variation on Biological and Chemical Concentrations in a Coastal Upwelling Ecosystem  [PDF]
Marilia M. F. de Oliveira, Gilberto C. Pereira, Jorge L. F. de Oliveira, Nelson F. F. Ebecken
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.411A008

Oscillations in sea level due to meteorological forces related to wind and pressure affect the regular tides and modify the sea level conditions, mainly in restricted waters such as bays. Investigations surrounding these variations and the biological and chemical response are important for monitoring coastal regions mainly where upwelling shelf systems occur. A spatial and temporal database from Quick Scatterometer satellite vector wind, surface stations from the Southeast coast of Brazil and surface seawater data collected in Anjos Bay, Arraial do Cabo city, northeast of Rio de Janeiro State were used to investigate the meteorological influences in the variability of the dissolved oxygen, nutrients, meroplankton larvae and chlorophyll-a concentrations. Multivariate statistical approaches such as Principal Component Analysis (PCA) and Clustering Analysis (CA) were applied to verify spatial and temporal variances. A correlation matrix was also verified for different water masses in order to identify the relationship between the above parameters. A seasonal variability of the meteorological residual presents a well-defined pattern with maximum peaks in autumn/winter and minimum during spring/summer with negative values, period of occurrence of upwelling in this region. This lowering of the sea level is in accordance with the increasing of nutrients and meroplankton larvae for the same period. CA showed six groups and an importance of the zonal and meridional wind variability, including these variables in a single cluster. PCA retained eight components, explaining 64.10% of the total variance of data set. Some clusters and loadings have the same variables, showing the importance of the sea-air interaction.

Simulating Male Selfish Strategy in Reproduction Dispute
P. M. C de Oliveira,S. Moss de Oliveira
Physics , 2002, DOI: 10.1142/S0129183103004413
Abstract: We introduce into the Penna Model for biological ageing one of the possible male mechanisms used to maximize the ability of their sperm to compete with sperm from other males. Such a selfish mechanism increases the male reproduction success but may decrease the survival probability of the whole female population, depending on how it acts. We also find a dynamic phase transition induced by the existence of an absorbing state where no selfish males survive.
Local Cutaneous Effects Associated with Chlorhexidine-Impregnated Gel Dressing in Hematopoietic Stem Cell Transplantation Patients  [PDF]
Bruna Nogueira dos Santos, Maria Carolina de Oliveira, Fernanda T. M. M. Braga, Amanda Salles Margatho, Laís C. C. Esparrachiari, Renata C. de C. P. Silveira
Open Journal of Nursing (OJN) , 2018, DOI: 10.4236/ojn.2018.82010

Introduction: Hematopoietic stem cell transplantation (HSCT) often requires a central venous catheter (CVC) for quick and safe vascular access. Currently, new technologies are available to protect the catheter insertion site, such as chlorhexidine-impregnated gel dressings (CIGD). Objectives: To evaluate local cutaneous effects associated with CIGD in patients undergoing HSCT. Methods: In this cross-sectional, prospective study, we evaluated 25 HSCT patients who had a CVC inserted. Patients were visited daily to monitor the CIGD changing procedures and evaluate abnormalities of the underlying skin after dressing removal. Findings: Local erythema was the most frequently detected abnormality, although usually transient and considered secondary to the mechanical trauma of dressing removal. The most severe lesions, consisting of areas of skin loss, erythematous plaques and/or vesicles were classified as skin irritation and presented in 11 (44%) of the 25 patients. An association test showed that skin irritation was more frequent in patients who underwent allogeneic HSCT (p = 0.03). Skin irritation was most frequently observed in areas of contact with the non-woven polyester adhesive tape (n = 22; 88%), which made up the adhesive margins of the dressing. The CIGD was discontinued in 6 (54%) of the 11 patients who presented severe skin injuries. Conclusion: In this study, we detected that skin irritation was more frequent in patients who underwent allogeneic HSCT. The most common skin manifestation was skin loss.

Genetic Optimization of Artificial Neural Networks to Forecast Virioplankton Abundance from Cytometric Data  [PDF]
Gilberto C. Pereira, Marilia M. F.de Oliveira, Nelson F. F. Ebecken
Journal of Intelligent Learning Systems and Applications (JILSA) , 2013, DOI: 10.4236/jilsa.2013.51007

Since viruses are able to influence the trophic status and community structure they should be accessed and accounted in ecosystem functioning and management models. So, this work met a set of biological, chemical and physical time series in order to explore the correlations with marine virioplankton community across different trophic gradients. The case studied is the Arraial do Cabo upwelling system, northeast of Rio de Janeiro State in Southeast coast of Brazil. The main goal is to evolve three type of artificial neural network (ANN) by genetic algorithm (GA) optimization to predict virioplankton abundance and dynamic. The input variables range from the abundance of phytoplankton, bacterioplankton and its ratios acquired by one in situ and another ex situ flow cytometers. These data were collected with weekly frequency from August 2006 to June 2007. Our results show viruses being highly correlated to their host, and that GA provided an efficient method of optimizing ANN architectures to predict the virioplankton abundance. The RBF-NN model presented the best performance to an accuracy of 97% for any period in the year. A discussion and ecological interpretations about the system behavior is also provided.

Toad envenoming in dogs: effects and treatment
Journal of Venomous Animals and Toxins , 2000, DOI: 10.1590/S0104-79302000000100003
Abstract: toads (order: anura; family: bufonidae; genus: bufo) are distributed throughout the world, but more species are found in areas of tropical and humid temperate climates. although toads do not have a venom inoculation system, they are venomous animals because the glands covering the whole surface of their bodies secrete a milk-like venom of which composition is not yet completely known. some of these glands are the bilateral glands located in post-orbital position. these glands, which are somewhat diamond-shaped and can be seen by the naked eye, are known as parotids. toad envenoming in dogs may cause local and systemic alterations and may cause death by cardiac ventricular fibrillation. the electrocardiographic alterations observed consist of gradual deterioration of the normal standards with progressive appearance of negative ventricular deflections that can result in ventricular fibrillation and death if the envenomed dog is not promptly treated. traditional therapy consists mainly of administration of atropine and propranolol; the latter used to prevent ventricular fibrillation.
Use of lidocaine, propranolol, amiodarone, and verapamil in toad envenoming (genus bufo) in dogs
Journal of Venomous Animals and Toxins , 2001, DOI: 10.1590/S0104-79302001000200008
Abstract: toad envenoming in dogs can cause death by cardiac fibrilation (cvf). traditional therapy consists mainly of atropine and propranolol, the last one used to prevent the cvf, that is preceded by negative ventricular deflections (nvds) in the qrs complex of the electrocardiogram. this study intended to verify, comparatively, the lidocaine, propranolol, amiodarone, and verapamil abilities to prevent cvf in experimentally envenomed dogs. thirty-six dogs were divided into 6 groups (gl, gp, ga, gv, gst, and gsv) with n=6; the dogs were submitted to volatile anaesthesia. the animals of the groups gl, gp, ga, and gv received 0.38g of toad venom through oro-gastric catheter and were treated with the following drugs respectively: lidocaine (4mg/kg), propranolol (0.1mg/kg), amiodarone (8mg/kg), and verapamil (2mg/kg). these drugs were repeated if nvds reappeared with cardiac frequency >150, gst was not treated and gsv was just anaesthetized. the following results were obtained: gl, nvds present in 4 animals, 100% recuperation with 3.66 doses/animal; gp, nvds present in 2 animals, 100% recuperation with 1.66 dose/animal, with bradycardia at the anaesthetic return; ga, nvds present in 3 animals, 33.33% recuperation with 1.5 dose/animal; gv, nvds present in 4 animals, 100% recuperation with 2.16 doses/animal; gst, nvd present in 6 animals, 100% death and gsv, nvds absent, 100% recuperation. as a conclusion, the anaesthetic proceedings used, did not cause nvds, the envenoming that was not treated was lethal, and among the antiarrhythmics drugs used, verapamil was the most efficient, as it did not cause any serious bradycardia at the anaesthetic return and did not require repeated administrations. for lidocaine, it was efficient but required various administrations; amiodarone could not prevent the death of 4 animals; propranolol was efficient in relation to nvds control, but caused serious bradycardia at the anaesthetic return.
Mutantes letais termossensíveis em Aspergillus nidulans
Oliveira, P. C. de;Andersen, M. H.;
Memórias do Instituto Oswaldo Cruz , 1975, DOI: 10.1590/S0074-02761975000100004
Abstract: temperature sensitive strains (42oc) of aspergillus nidulans were obtaines by u.v. irradiation. the mutant alleles had not been located and among 18 thermosensitive mutants theree gave clear evidence that the determinant of thermosensitivity was caused by effects associated with the nucleus and were selected for further studies. diploids have been synthesised between normal straisn and the three latter variants eschibiting lethality at 42oc and a complete recessivity of the character in each case was shown. for comparative purposes attempts were made to find instances of "adaptation". nutritionally balanced heterokaryons, between tsl and the wild tipe strains for the corresponding alleles had show quite different results when experience on increasing initial incutation time at 37oc ant then were transfered to 41oc. heterokaryons had not showed adaptative reponse to the changes of temperature. the heterokaryon: heterozygote slight difference of behavior doubtless arose as result of dosage effects. the results reinforced and offered some confidence in heterokaryon stability under constant environmental conditions.
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