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Search Results: 1 - 10 of 13652 matches for " Mariana Ruiz "
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Uso de una Estación Experimental de Lombricomposta para Desarrollar Experiencias Multidisciplinarias a Nivel Universitario
Ruiz,Mariana; Acevedo,Adriana;
Formación universitaria , 2011, DOI: 10.4067/S0718-50062011000500004
Abstract: this paper describes the use of a vermicomposting station at the universidad iberoamericana in mexico city, as an educational tool to generate multidisciplinary experiences. students from five majors have participated in the station in one or more of the seven experiments that have been designed for this purpose, and the station has increased its productivity in almost 500%. this educational tool has allowed illustrating several topics on waste management, chemical analysis, biology, urban impact, efficiency and productivity, among others. in the near future, it is expected to incorporate new activities in several other courses, to continue promoting reflective practice, environmental concern, and sustainable technology development.
CARACTERIZACIóN DE RESIDUOS SóLIDOS EN LA UNIVERSIDAD IBEROAMERICANA, CIUDAD DE MéXICO
Mariana RUIZ MORALES
Revista internacional de contaminación ambiental , 2012,
Abstract: Como parte de un diagnóstico sobre el estado que guarda la generación, el manejo y la disposición de los residuos sólidos en la Universidad Iberoamericana, Ciudad de México (IBERO) y a fin de presentar propuestas que contribuyan al desarrollo sustentable de la institución, se realizó un estudio de cuantificación y caracterización en los a os 2008 y 2009. Entre los resultados obtenidos está la generación total diaria que asciende a alrededor de 3.3 toneladas (0.33 kg/per cápita, 0.017 kg /m2). Se encontró que el 52 % del residuo generado es susceptible al proceso de composteo, 27 % es material reciclable y únicamente el 21 % es residuo que se destinaría a relleno sanitario. El porcentaje de residuos totales aprovechados actualmente en la IBERO asciende a 26.23 %, se recicla el 100 % del residuo de jardinería, el 1 % del residuo alimenticio, el 23 % del papel, el 16.5 % del cartón, el 1.8 % de las botellas de PET y el 4 % de las latas de aluminio. Siendo que los materiales de mayor generación son recuperables, se presentan algunas recomendaciones para mejorar el sistema actual de separación y recolección.
Biodegradabilidad de Artículos Desechables en un Sistema de Composta con Lombriz Biodegradability of disposable products in a vermicomposting system
Mariana Ruiz,Karla Pastor,Adriana Acevedo
Información Tecnológica , 2013,
Abstract: El objetivo de este estudio es evaluar de manera preliminar si materiales denominados "verdes" o "biodegradables" son degradados satisfactoriamente en sistemas de composta con lombriz a peque a escala. La mayoría de dichos materiales se elaboran con derivados del papel o con biopolímeros naturales, de los cuales el más común es el ácido poliláctico (PLA). Para el estudio se sometieron a distintas pruebas cuatro artículos desechables etiquetados como biodegradables hechos de los siguientes materiales: bagazo de ca a de azúcar, PLA, papel recubierto por PLA y polímero de maíz. Los resultados mostraron que el PLA, el papel recubierto por PLA y el polímero de maíz no presentan una degradación adecuada en estos sistemas. Esto se atribuye a que no se tienen las condiciones necesarias para iniciar la hidrólisis que el biopolímero requiere para disminuir su masa molecular y hacerlo susceptible al ataque microbiológico y/o a la digestión por lombriz. En cambio el material de bagazo de ca a de azúcar mostró un desempe o positivo en la prueba. The objective of this study is to conduct an initial test of whether green disposable products satisfactorily degrade in small-scale vermicomposting systems. Most of these materials are made of paper/cardboard or natural biopolymers, being the polylactic acid (PLA) the most commonly employed. Four disposable green products, made of sugar cane fiber, PLA, paper covered with PLA and corn polymer, respectively, were tested. Results showed that disposable items made of PLA, paper covered with PLA, and corn polymer do not satisfactorily degrade in this kind of systems. This is mainly due to not having the ideal conditions for biopolymer hydrolysis, molecular weight reduction, and subsequent microbiological attack and/or worm digestion. However, the sugar cane fiber material had a positive performance in the test.
Chimerism induction by nonmyeloablactive preconditioning and bone marrow infusion in rat small bowel transplantation
Bakonyi Neto Alexandre,Behro Mariana,Ruiz Phillip,Misiakos Evangelos P.
Acta Cirurgica Brasileira , 2003,
Abstract: In our previous work we demonstrated that the use of donor specific bone marrow infusions ( DSBMI ) after small bowel transplantation did not improve the graft survival after a short course of immunossupression. PURPOSE: In the current study, we evaluated whether recipient preconditioning with different regimens of radiation combined with DSBMI may enhance small bowel allograft survival with minimum recipient morbidity. METHODS: Heterotopic small bowel transplantation (SBTx) was performed with Lewis rats as recipients and DA rats as donors, which were immunossupressed with a short course of tacrolimus (FK 506 ) at 1mg/Kg/day for 5 days and distributed in 4 groups: group 1 (n= 4) without both irradiation and DSBMI; Groups 2 (n= 6), 3 (n= 9) and 4 (n= 6) received 100 x 10(6) DSBM cells at the time of the transplant. Groups 3 and 4 were irradiated with 250 and 400 rd respectively. Animals were examined daily for clinical signs of rejection or GVHD. Blood samples were taken weekly for chimeric studies by FC and intestinal biopsies were performed every 2 weeks. RESULTS: Animals in G1 and G2 had minimal rejection at day 15 after SBTx while GVHD was clinically and histologically characterized in G 3 and G 4. Total chimerism and T-cell chimerism was higher in irradiated groups when compared to non-irradiated groups. With exception of G1 and 2 where rejection was the cause of death, all animals in G3 and 4 died of GVHD. CONCLUSION:We concluded that low cytoreductive of irradiation can successfully decrease the graft rejection but not prevent the occurrence of GVHD.
Estudiantes de pregrado: el futuro de la investigación Undergraduate students: the future of research
Jorge Osada,Paulo Ruiz-Grosso,Mariana Ramos
Revista Peruana de Medicina Experimental y Salud Pública , 2010,
Abstract:
Parallel queues with synchronization
Mariana Olvera-Cravioto,Octavio Ruiz-Lacedelli
Mathematics , 2014,
Abstract: Motivated by the growing interest in today's massive parallel computing capabilities we analyze a queueing network with many servers in parallel to which jobs arrive a according to a Poisson process. Each job, upon arrival, is split into several pieces which are randomly routed to specific servers in the network, without centralized information about the status of the servers' individual queues. The main feature of this system is that the different pieces of a job must initiate their service in a synchronized fashion. Moreover, the system operates in a FCFS basis. The synchronization and service discipline create blocking and idleness among the servers, which is compensated by the fast service time attained through the parallelization of the work. We analyze the stationary waiting time distribution of jobs under a many servers limit and provide exact tail asymptotics; these asymptotics generalize the celebrated Cram\'er-Lundberg approximation for the single-server queue.
Wild boar: an increasing concern for Aujeszky's disease control in pigs?
Mariana Boadella, Christian Gortázar, Joaquín Vicente, Francisco Ruiz-Fons
BMC Veterinary Research , 2012, DOI: 10.1186/1746-6148-8-7
Abstract: Sera from 1659 wild boar were collected from 2000 to 2010 within 6 areas of the Iberian Peninsula and tested for the presence of antibodies against ADV by ELISA. According to sampling date, wild boar were grouped into three time periods. ADV prevalence was compared through period both globally and by geographic area. Overall seroprevalence for the ten-year study period was 49.6 ± 2.4%. The highest seroprevalence was recorded in areas with intense wild boar management. The annual proportion of positive wild boar sampling sites remained stable through the study period, while the percentage of domestic pig AD positive counties decreased from 70% in 2003 to 1.7% in 2010.Results presented herein confirmed our hypothesis that ADV would remain almost stable in wild boar populations. This evidences the increasing risk wild boar pose in the final stages of ADV eradication in pigs and for wildlife conservation.Aujeszky's disease (AD), also known as pseudorabies, is one of the most economically important infectious diseases of swine for which suids are the natural hosts [1]. The disease is caused by Suid herpesvirus type I, a neuroinvasive virus with a wide host range that excludes only higher primates. Mammals other than suids are considered dead-end hosts since infection is normally fatal before virus excretion occurs. AD has a high economic impact in pig husbandry, both through direct effects of the disease on the animals and through movement and trade restrictions of pigs and their products. The direct impact of AD in wild boar population dynamics is considered to be low, but AD outbreaks with associated wild boar mortality have been reported and restrictions to wild boar movements may also have an impact on wild boar production for hunting [2,3].Implications in conservation are considerable since fatal cases have repeatedly been described in endangered carnivores after consumption of ADV contaminated meat [4,5]. In the Iberian Peninsula, the Iberian wolf (Canis lupus sign
Desempe?o de los procedimientos laparoscópicos en ginecología: adquisición y mantenimiento de la idoneidad
Vázquez Zárate,Víctor; Zepeda Zaragoza,Jorge; Briones Landa,Carlos; Hernández Ruiz,Mariana;
Revista chilena de obstetricia y ginecología , 2011, DOI: 10.4067/S0717-75262011000400012
Abstract: the advancement of new surgical techniques in medical specialties has become minimally invasive gynecologic surgery into a modern surgical technique. there are a number of advantages to the patient with laparoscopic surgery versus an open procedure, obtaining in most cases mayor benefits than traditional surgery techniques. the purpose of this study was to describe which are the best aspects and techniques for developing and maintaining skills in gynecologic laparoscopic surgery and identify the factors affecting learning curves. a lot of factors are involved: like institutional policies and the characteristics of the surgeon such as attitude and capacity for acquiring new skills. prior laparoscopic training has been shown to facilitate the process of learning, reduces complication rates and operative time. the type of training the surgeon has received is not significantly related to this learning curve. maintaining consistency is challenging: however, assessing laparoscopic learning can also examine surgical competence. consequently the implementation should be monitored by quantitative methods in order to provide both numerical and graphical representation of the learning process. the learning curves combined with the advantages of feedback using the rating scales open the possibility to design high-quality training curricula in advanced laparoscopy. it is clear that academic programs must be updated: this leads to an increasing demand for evidence and proficiency-based education, training and assessment of gynecologic laparoscopic skills. we need a feasible, structured and objective statistical system for assessment of both technical and procedural skills.
Implementación de un plan de verificación de material volumétrico en la Sección Química de la EEAOC (Tucumán, R. Argentina)
Navarro,María E.; Alva,Mariana E.; Kamiya,Norma I.; Ruiz,Roberto M.;
Revista industrial y agr?-cola de Tucum??n , 2010,
Abstract: a volumetric material verification plan which can be easily followed and an example of its practical application to the assessment of volumetric flasks are reported. the procedure would guarantee the reliability of analysis results, while ensuring that laboratories meet the requirements established by iram 301:2005 (iso/iec 17025:2005) standard.
Impacto de la duración de la psicosis no tratada (DPNT) en el curso y pronóstico de la esquizofrenia
García, Isis;Fresán, Ana;Medina-Mora, María Elena;Ruiz, Gabriela Mariana;
Salud mental , 2008,
Abstract: the duration of untreated psychosis (dup), defined as the period of time between the onset of psychotic symptoms, such as hallucinations and delusions, and the first effective treatment, has been associated to prognosis of schizophrenia. it has been demonstrated that although psychotic symptoms are initially detected by relatives of patients with schizophrenia, they take a long time to seek specialized attention, which in turn leads to a delay in the diagnosis and treatment of the disorder. schizophrenia has been considered by the world health organization as a public health problem and has been placed as the ninth cause of incapacity in the world. thus, dup represents part of this public health problem. in mexico, the average dup lasts 64 weeks, which is very similar to the average observed in other countries, where the mean dup in psychotic patients varies between one and two years. one of the main reasons of a prolonged dup is that patients and their families first assist with a general practitioner which, in many cases, does not perform an adequate diagnosis with the subsequent referral to a psychiatric facility, and the treatment given for the patient is based on sedative medication. this is also mexico's case, where seeking help primarily involves religious groups, with very few referrals to psychiatric facilities and with inadequate treatment support, which delays care in specialized services. it has been established that early treatment is related to a better prognosis and outcome, while treatment delay has been related to a longer time to achieve symptom remission. these results support the hypothesis that the presence of psychotic symptoms for a long period of time may predispose to biological damage, which may in turn lead to predominant negative symptoms and severe cognitive deficits after the first psychotic episode. also, some studies have found that a longer dup is related to a more insidious illness onset, frequent relapses and psychiatric hospitaliz
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