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Search Results: 1 - 10 of 12039 matches for " Natalia; Ortega Rodriguez "
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Interculturalidad y percepciones en salud materno-perinatal, Toribio Cauca 2008-2009
Mu?oz Bravo,Sandra Felisa; Castro,Edgar; Castro Escobar,Zindy Alexandra; Chávez Narvaez,Natalia; Ortega Rodriguez,Diana Marcela;
Revista de la Universidad Industrial de Santander. Salud , 2012,
Abstract: introduction: interculturality is a proposal for dialogue, exchange and complementarity. objective: analyse the factors related with attention to intercultural health of the pregnant women of the municipality of toribio 2008- 2009. materials and methods: qualitative and ethnographic study. involving 19 health agents e.s.e cxayutc'e jxut*, 24 health promoters, 10 pregnant women nasa and 6 midwives and thewala of the association of indigenous cabildos of north of cauca. for the collection of data using a semi-structured interview, ethnographic survey, and focus group was used for data collection. results: cultural differences between the traditional and optional medical systems create barriers around the care of the pregnant woman; it determine the search for optional health services. highlight the preservation of the care of cultural for the nasa family and the recognition of optional medicine. the study allowed to elucidate the committed staff of health as a passive actor uncommitted. the agents aspire to recognize local health practices and its incorporation into the health systems, to strengthen attention to intercultural and institutional as complement. conclusions: 1.barriers to intercultural care range from the divergence of concepts, the little credibility, lack of knowledge of the capabilities and limitations, negative experiences when trying to integrate the two systems of health. 2.the search for balance and harmonization of the accompanied by prenatal body, are health activities of the native that gestated and care practices, are governed by the cultural locally and family hegemony as a right. salud uis 2012; 44 (1): 39-44
The interaction of binary systems with accretion disks
Manuel Ortega Rodriguez
Revista mexicana de astronomía y astrofísica , 2004,
Abstract: Se estudia las uctuaciones (temporales) en la radiaci on saliente de discos de acreci on en sistemas binarios, con el objeto de determinar las propiedades de dichos sistemas (comparando con las observaciones), tales como el momento angular de la estrella compacta alojada en el disco. Despu es de una discusi on de los efectos de la estrella compa~nera se presenta una predicci on de la frecuencia de la radiaci on saliente (modulada) de rayos X.
Review of the Regulatory Requirements for the Maintenance of Aerobic Treatment Units and Greywater Treatment Systems in Western Australia  [PDF]
Tessa McGrath, Natalia Shishkina, Richard Theobald, Clemencia Rodriguez
Journal of Water Resource and Protection (JWARP) , 2015, DOI: 10.4236/jwarp.2015.717124
Abstract: Aerobic Treatment Units (ATU) and Greywater Treatment Systems (GTS) are onsite wastewater treatment systems (OWTS) designed to treat wastewater to secondary effluent quality standards. Consequently, the electrical, mechanical and chemical components of these OWTS need to be regularly maintained to ensure their consistent and reliable operation to the required standards. In Western Australia (WA), the Department of Health set out the regulatory requirements for the maintenance of OWTS as well as when and how it is to occur. This paper reviews the maintenance requirements for ATU and GTS in WA and provides recommendations for the proposed changes in guidelines and regulations. State and national guidelines were reviewed and information from industry and regulators was obtained through surveys. The review found that although the guidelines are generally satisfactory there are a number of areas which could be improved and specific recommendations are discussed.
Tenofovir Nephrotoxicity: 2011 Update
Beatriz Fernandez-Fernandez,Ana Montoya-Ferrer,Ana B. Sanz,Maria D. Sanchez-Ni?o,Maria C. Izquierdo,Jonay Poveda,Valeria Sainz-Prestel,Natalia Ortiz-Martin,Alejandro Parra-Rodriguez,Rafael Selgas,Marta Ruiz-Ortega,Jesus Egido,Alberto Ortiz
AIDS Research and Treatment , 2011, DOI: 10.1155/2011/354908
Abstract: Tenofovir is an acyclic nucleotide analogue reverse-transcriptase inhibitor structurally similar to the nephrotoxic drugs adefovir and cidofovir. Tenofovir is widely used to treat HIV infection and approved for treatment of hepatitis B virus. Despite initial cell culture and clinical trials results supporting the renal safety of tenofovir, its clinical use is associated with a low, albeit significant, risk of kidney injury. Proximal tubular cell secretion of tenofovir explains the accumulation of the drug in these mitochondria-rich cells. Tenofovir nephrotoxicity is characterized by proximal tubular cell dysfunction that may be associated with acute kidney injury or chronic kidney disease. Withdrawal of the drug leads to improvement of analytical parameters that may be partial. Understanding the risk factors for nephrotoxicity and regular monitoring of proximal tubular dysfunction and serum creatinine in high-risk patients is required to minimize nephrotoxicity. Newer, structurally similar molecular derivatives that do not accumulate in proximal tubules are under study. 1. Tenofovir Tenofovir disoproxil fumarate is an orally bioavailable prodrug of tenofovir, an acyclic nucleotide analogue reverse-transcriptase inhibitor (NtRTI) structurally similar to adefovir and cidofovir [1] (Figure 1). Acyclic nucleotides differ in their side chains: hydroxy phosphonomethoxypropyl (HPMP) for cidofovir, phosphonomethoxyethyl (PME) for adefovir and phosphonomethoxypropyl (PMP) for tenofovir [2]. Tenofovir diphosphate is a structural analog of deoxyadenosine-5′-triphosphate, the usual substrate for viral RNA-directed DNA polymerase, and is a weak inhibitor of mammalian DNA α- and β-polymerases and mitochondrial DNA γ-polymerase [3]. Figure 1: Chemical structure of the three main nephrotoxic acyclic nucleotide analogs, adefovir, cidofovir and tenofovir, as well as less nephrotoxic tenofovir derivatives under development. A lesser uptake by proximal tubular cells can be achieved by either esterifying the compounds with an alkoxyalkyl group, in effect disguising them as lysophospholipids (hexadeciloxypropyl-tenofovir, CMX157) or by ribose-modification (GS-9148 and its oral prodrug GS-9131). Tenofovir was the first (2001), and remains the only, NtRTI approved by the US Food and Drug Administration (FDA) for the treatment of HIV infection [1]. Tenofovir was also approved for treatment of chronic hepatitis B in adults in 2008 [4]. Tenofovir is now a widely used component of antiretroviral regimens for both treatment-naive and experienced patients on the basis of its
Las Coordinadoras Interfabriles de Capital y Gran Buenos Aires (1975-1976): Un estado del arte
Melisa Slatman,Florencia Rodriguez,Natalia Lascano
Revista Theomai , 2009,
On the Perturbations of Viscous Rotating Newtonian Fluids
Manuel Ortega-Rodriguez,Robert V. Wagoner
Physics , 2000, DOI: 10.1086/309060
Abstract: The perturbations of weakly-viscous, barotropic, non-self-gravitating, Newtonian rotating fluids are analyzed via a single partial differential equation. The results are then used to find an expression for the viscosity-induced normal-mode complex eigenfrequency shift, with respect to the case of adiabatic perturbations. However, the effects of viscosity are assumed to have been incorporated in the unperturbed (equilibrium) model. This paper is an extension of the normal-mode formalism developed by Ipser & Lindblom for adiabatic pulsations of purely-rotating perfect fluids. The formulas derived are readily applicable to the perturbations of thin and thick accretion disks. We provide explicit expressions for thin disks, employing results from previous relativistic analyses of adiabatic normal modes of oscillation. In this case, we find that viscosity causes the fundamental p- and g- modes to grow while the fundamental c-mode could have either sign of the damping rate.
Cellular replication limits in the Luria-Delbrück mutation model
Ignacio A Rodriguez-Brenes,Dominik Wodarz,Natalia L. Komarova
Quantitative Biology , 2015,
Abstract: Originally developed to elucidate the mechanisms of natural selection in bacteria, the Luria-Delbr\"uck model assumed that cells are intrinsically capable of dividing an unlimited number of times. This assumption however, is not true for human somatic cells which undergo replicative senescence. Replicative senescence is thought to act as a mechanism to protect against cancer and the escape from it is a rate-limiting step in cancer progression. Here we introduce a Luria-Delbr\"uck model that explicitly takes into account cellular replication limits in the wild type cell population and models the emergence of mutants that escape replicative senescence. We present results on the mean, variance, distribution, and asymptotic behavior of the mutant population in terms of three classical formulations of the problem. More broadly the paper introduces the concept of incorporating replicative limits as part of the Luria-Delbr\"uck mutational framework. Guidelines to extend the theory to include other types of mutations and possible applications to the modeling of telomere crisis and fluctuation analysis are also discussed.
Obtención Y Caracterización De Nanopartículas Coloidales Empleando Métodos ópticos
Lorenzo Echevarria,Maria Alejandra Ortega,Luis Rodriguez,Jimmy Castillo
Bistua : Revista de la Facultad de Ciencias Básicas , 2008,
Abstract: Hoy en día, la nanotecnología tiene un importante papel a nivel mundial en cuanto a la investigación y desarrollo científico e industrial se refiere. Las nanopartículas metálicas forman parte de esta tecnología y tienen diversas aplicaciones debido al cambio de sus propiedades ópticas con respecto a sus características morfológicas. La ablación láser es un método físico aplicado para la obtención de este tipo de nanoestructuras. Para la estabilización de estos sistemas en soluciones líquidas se requiere de un medio estabilizante, que evite la aglomeración de las nanopartículas generadas mediante la formación de coloides. Se presentan los diferentes factores que permiten ejercer cierto control en la morfología de las nanopartículas empleando este tipo de metodologías para su generación. Entre estos factores se encuentran algunos parámetros del láser que induce la ablación tales como la cantidad de impactos sobre el material e irradiancia y otros que dependen de la naturaleza del estabilizante. Entre las principales virtudes de esta metodología se encuentran su eficiencia en la generación de nanopartículas, la posibilidad de utilizar diversos materiales que pueden ser ableados en estas condiciones y el uso de diversos medios estabilizantes. Esta última característica permite el estudio de la interacción entre las nanopartículas y su entorno. En particular es de gran interés evaluar la trasferencia de energía entre nanopartículas y moléculas de interés para aplicaciones biológicas y energéticas. La caracterización de los sistemas obtenidos se efectúa mediante Microscopía Electrónica de Transmisión, espectroscopia de UV-Visible y espectroscopia fototérmica. Mediante el estudio de las propiedades ópticas lineales y no lineales de estos nanofluidos, se pueden explorar diversas aplicaciones tecnológicas de interés particular en la generación de fuentes alternativas de energía, intercambio de calor en refrigerantes y en el ámbito del desarrollo de sensores químicos y biológicos.
DYNA , 2012,
Abstract: Las aguas residuales hospitalarias se consideran como una de las principales fuentes de contaminantes emergentes, resultado de las diferentes actividades que allí se realizan y la excreción de las sustancias por los pacientes. Estudios han demostrado que estos componentes no son fácilmente removidos por medio de procesos de tratamiento convencionales como las plantas de tratamiento que emplean procesos biológicos. En este sentido el propósito de este trabajo consistió en evaluar la degradación de la materia orgánica presente en aguas hospitalarias reales aplicando ozono en diferentes condiciones de pH (3,0, 6,7, 10). Para esto se analizaron los valores de la UV254, la relación de biodegradabilidad DQO/DBO5 y el color (VIS436). Adicional a esto, se realizó un ensayo de toxicidad aguda, utilizando bulbos de cebolla común (Allium cepa L). Los resultados mostraron que con una dosis aplicada de ozono de 187 mgO3/h y valores de pH=10 la biodegradabilidad se aumento en un 70% y la toxicidad aguda se redujo en 62%, mientras que para valores de pH =3,0, se favoreció la remoción de la UV254 y el color. La aplicación de ozono demostró ser una alternativa viable para tratar efluentes hospitalarios como pretratamiento de un proceso biológico.
Proton-Proton Spin Correlations at Charm Threshold and Quarkonium Bound to Nuclei
Guy F. de Teramond,Randall Espinoza,Manuel Ortega-Rodriguez
Physics , 1997, DOI: 10.1103/PhysRevD.58.034012
Abstract: The anomalous behavior of the spin-spin correlation at large momentum transfer in pp elastic scattering is described in terms of the degrees of freedom associated with the onset of the charm threshold. A non-perturbative analysis based on the symmetries of QCD is used to extract the relevant dynamics of the charmonium-proton interaction. The enhancement to pp amplitudes and their phase follow from analyticity and unitarity, giving a plausible explanation of the spin anomaly. The interaction between charmonium and light quarks in nuclei may form a distinct kind of nuclear matter, nuclear bound quarkonium.
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