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Search Results: 1 - 10 of 231928 matches for " Sandra C. C.;Rodriguez "
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Ultrasound-assisted extraction of Ca, K and Mg from in vitro citrus culture
Arruda, Sandra C. C.;Rodriguez, Adriana P. M.;Arruda, Marco A. Z.;
Journal of the Brazilian Chemical Society , 2003, DOI: 10.1590/S0103-50532003000300023
Abstract: an ultrasound extraction procedure for ca, k and mg from in vitro plant cultures is proposed, comparing cultures of different embryogenic levels of citrus sinensis and citrus limonia, employing ultrasound energy. parameters related to metals extraction, such as plant material sampling, acid concentration and sonication time were investigated. for accuracy check, the proposed ultrasound extraction procedure was compared with a microwave-assisted digestion procedure and no differences in the results were verified at 95% of the confidence level. with this simple and accurate extraction procedure, it was possible to determine differences in ca, k and mg concentrations during citrus embryo formation/development and between cultures (embryogenic and non-embryogenic). finally, the ultrasound extraction method demonstrated to be an excellent alternative for handless sampling and operational costs.
Ultrasound-assisted extraction of Ca, K and Mg from in vitro citrus culture
Arruda Sandra C. C.,Rodriguez Adriana P. M.,Arruda Marco A. Z.
Journal of the Brazilian Chemical Society , 2003,
Abstract: An ultrasound extraction procedure for Ca, K and Mg from in vitro plant cultures is proposed, comparing cultures of different embryogenic levels of Citrus sinensis and Citrus limonia, employing ultrasound energy. Parameters related to metals extraction, such as plant material sampling, acid concentration and sonication time were investigated. For accuracy check, the proposed ultrasound extraction procedure was compared with a microwave-assisted digestion procedure and no differences in the results were verified at 95% of the confidence level. With this simple and accurate extraction procedure, it was possible to determine differences in Ca, K and Mg concentrations during Citrus embryo formation/development and between cultures (embryogenic and non-embryogenic). Finally, the ultrasound extraction method demonstrated to be an excellent alternative for handless sampling and operational costs.
Modulatory Communication Signal Performance Is Associated with a Distinct Neurogenomic State in Honey Bees
Cédric Alaux, Nhi Duong, Stanley S. Schneider, Bruce R. Southey, Sandra Rodriguez-Zas, Gene E. Robinson
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0006694
Abstract: Studies of animal communication systems have revealed that the perception of a salient signal can cause large-scale changes in brain gene expression, but little is known about how communication affects the neurogenomic state of the sender. We explored this issue by studying honey bees that produce a vibratory modulatory signal. We chose this system because it represents an extreme case of animal communication; some bees perform this behavior intensively, effectively acting as communication specialists. We show large differences in patterns of brain gene expression between individuals producing vibratory signal as compared with carefully matched non-senders. Some of the differentially regulated genes have previously been implicated in the performance of other motor activities, including courtship behavior in Drosophila melanogaster and Parkinson's Disease in humans. Our results demonstrate for the first time a neurogenomic brain state associated with sending a communication signal and provide suggestive glimpses of molecular roots for motor control.
Búsqueda de Tuberculosis en Pacientes Sintomáticos Respiratorios en Cuatro Hospitales de Bogotá D.C.
Henao-Riveros,Sandra C.; Sierra-Parada,Claudia R.; Sánchez-Morales,Edgar A; Saavedra Rodriguez,Alfredo;
Revista de Salud Pública , 2007, DOI: 10.1590/S0124-00642007000300009
Abstract: objective to identify individuals with the respiratory symptoms who receive different medical services in third level hospitals of bogotá d.c. for early diagnosis of tuberculosis. materials and methods an active search for individuals with tuberculosis respiratory symptoms through promotion and prevention activities was realized utilizing a format for obtaining social, demographic and clinical data. 566 samples of sputum from 354 individuals with respiratory symptoms were investigated in four bogota hospitals. by means of positive smear and bacillus culture the tuberculosis patients were detected. results the gender distribution was 39 % male and 61 % female, with an average age of 57,4 years. 48,5 % had respiratory symptoms for more than two months, 53,3 % presented bcg scar, 50 % belonged to socioeconomic level 2 and 72,8 % had an education level equal to or less than basic elementary school. the percentage detected by positive smear was of 3,67 % and by positive smear and/or culture was of 4,2 %. 11 cases of mycobacterium tuberculosis and 2 cases of non tuberculosis mycobacterium were found. the majority of patients with tuberculosis belonged to the masculine gender, presented coughing symptoms and expectoration greater than two months and 54,5 % had bcg vaccination. conclusions the active search patients with the respiratory symptoms detected cases of patients with positive smear, a source of contamination among the population, which facilitates the anti-tuberculosis therapy applying the dots strategy. the success of tuberculosis control will depend on government policies that follow the oms recommendations.
Production of Trametes pubescens Laccase under Submerged and Semi-Solid Culture Conditions on Agro-Industrial Wastes
Juan C. Gonzalez, Sandra C. Medina, Alexander Rodriguez, Johann F. Osma, Carlos J. Alméciga-Díaz, Oscar F. Sánchez
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0073721
Abstract: Laccases are copper-containing enzymes involved in the degradation of lignocellulosic materials and used in the treatment of phenol-containing wastewater. In this study we investigated the effect of culture conditions, i.e. submerged or semi-solid, and copper supplementation on laccase production by Trametes pubescens grown on coffee husk, soybean pod husk, or cedar sawdust. The highest specific laccase activity was achieved when the culture was conducted under submerged conditions supplemented with copper (5 mM), and using coffee husk as substrate. The crude extracts presented two laccase isoforms with molecular mass of 120 (Lac1) and 60 kDa (Lac2). Regardless of the substrate, enzymatic crude extract and purified fractions behaved similarly at different temperatures and pHs, most of them presented the maximum activity at 55 °C and a pH range between 2 and 3. In addition, they showed similar stability and electro-chemical properties. At optimal culture conditions laccase activity was 7.69±0.28 U mg-1 of protein for the crude extract, and 0.08±0.001 and 2.86±0.05 U mg-1 of protein for Lac1 and Lac2, respectively. In summary, these results show the potential of coffee husk as an important and economical growth medium to produce laccase, offering a new alternative use for this common agro-industrial byproduct.
Pandemic influenza: A global challenge for social marketing marketing  [PDF]
Sandra C. Jones, Don Iverson
Health (Health) , 2012, DOI: 10.4236/health.2012.430146
Abstract: Recent years have seen increased attention and concern regarding the potential for pandemic influenza, following large-scale outbreaks of swine flu and bird flu. Governments and health agencies have time to develop social marketing strategies and specific messages that have the potential to minimize fear, refute or inoculate against misinformation that the public may encounter, and enhance the likelihood of the public taking the recommended preventive and remedial actions should these become necessary. This paper presents an overview of how social marketing can be used to tackle the global challenge of pandemic influenza. The potential pandemic influenza poses a major challenge for social marketers (along with governments, health services, and businesses). There are a number of critical factors about a potential pandemic influenza that make it fundamentally different to the majority of issues to which social marketing has previously been applied. The underlying principles of social marketing are equally applicable to a global infectious disease outbreak (such as pandemic influenza). Even if the current strains do not become pandemic, social marketers should use this impetus to develop the skills and resources to address future communicable disease outbreaks. This paper applies the concepts of social marketing to a unique health issue which has the potential to become one of the largest global public health crises in history, but which can be tackled with effective global social marketing.
La Radiodifusión internacional ante la convergencia digital.Futuros, realidades e imaginaciones
RODRIGUEZ,CéSAR AUGUSTO;
Signo y Pensamiento , 2009,
Abstract: short-wave international broadcasting enters the last phase of a crisis that has lasted almost 20 years. in this last phase, international broadcasting has been confronted by internet and now faces up new challenges that emerge from social, economic, political and technology variables. if this phase cannot be surpassed, short wave international broadcasting will become a thing of the past, only to be appreciated as an old art. this article exposes the abovementioned different variables, being as it is, an issue of great uncertainty and constant changes, and makes plans for the future of radio broadcasting taking in stride today’s historic vectors and resorting to our imagination.
Double Chargino Production in $e^{-}e^{-}$ scattering
Rodriguez, M. C.
High Energy Physics - Phenomenology , 2007, DOI: 10.1142/S0217751X07039250
Abstract: We point out the production of the charginos and neutralinos in electron-electron process in several supersymmetric models, in order to show that the International Linear Collider can discover double charged charginos if these particles really exist in nature.
A supersymmetric 3-4-1 model
Rodriguez, M. C.
High Energy Physics - Phenomenology , 2007, DOI: 10.1142/S0217751X07037275
Abstract: We build the complete supersymmetric version of a 3-4-1 gauge model using the superfield formalism. We point out that a discrete symmetry, similar to the R-symmetry in the minimal supersymmetric standard model, is possible to be defined in this model. Hence we have both R-conserving and R-violating possibilities. We also discuss some phenomenological results coming from this model.
$R$-Parity in Supersymmetric Left-Right Models
Rodriguez, M. C.
High Energy Physics - Phenomenology , 2007,
Abstract: On this article we show explicity that Supersymmetric Left-Right Models already satisfy the R-parity. They also respect $L$-parity and $B$-parity.
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