oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 42 )

2018 ( 391 )

2017 ( 409 )

2016 ( 479 )

Custom range...

Search Results: 1 - 10 of 233417 matches for " Alberto Ramos L. "
All listed articles are free for downloading (OA Articles)
Page 1 /233417
Display every page Item
Sistema semiautomático de control para procesos de corrugado en fabricación de cartón
Alfredo Chacón G.,Alberto Ramos L.,Alexander Ruiz M.
Visión Electrónica , 2012,
Abstract: El presente artículo presenta el desarrollo de un control semiautomático en una maquina corrugadora de papel. Este proyecto de desarrollo tecnológico se enfoca en optimizar y controlar tres procesos en la producción del cartón: montaje y alineación de rollos, control de arrope para la temperatura del papel y control de presión “Short- Press” en el proceso de unión y secado del cartón. Adicionalmente se acondiciona una interfaz gráfica para permitirle al operario el cambio de parámetros de funcionamiento, utilizando la estructura mecánica de la maquina corrugadora existente, así como algunos sensores e implementando y programando un control automático PLC, se logran procesos más precisos, que cumplen con estándares de fabricación, que además de mejorar la calidad del producto y aumentar la productividad protegen la maquina reduciendo tiempos muertos por paros de mantenimiento y reparaciones.
Playing with the kinetic term in the HMC
Alberto Ramos
Physics , 2012,
Abstract: The HMC algorithm, combining the advantages of molecular dynamics and Monte-Carlo methods, is the most efficient algorithm to simulate QCD including the effects of sea quarks. In the standard approach momentum fields are generated with a Gaussian probability density. In this work I will explore another possibility. By using a Lorentz distribution one can dynamically impose a cutoff in the rate of change of the coordinates that potentially could have a better behavior. I will present some results in pure SU(2) gauge theory.
The Yang-Mills gradient flow and renormalization
Alberto Ramos
Physics , 2015,
Abstract: In this proceedings contribution we will review the main ideas behind the many recent works that apply the gradient flow to the determination of the renormalized coupling and the renormalization of composite operators. We will pay special attention to the continuum extrapolation of flow quantities.
Prevalência de doen a tireoideana em pacientes com diabetes tipo 1
Ramos Alberto José S.,Costa Ana Débora M. da,Benicio Ana Valéria L.,Ramos André Luiz C.
Arquivos Brasileiros de Endocrinologia & Metabologia , 2003,
Abstract: INTRODU O: O diabetes mellitus tipo 1 (DM1) freqüentemente se acompanha de outras doen as autoimunes, principalmente doen a autoimune da tireóide (DAT). OBJETIVO: Determinar a prevalência de DAT em pacientes com DM1 e investigar possível relacionamento com outros fatores. MéTODOS: Em 126 pessoas com DM1, foram mensurados TSH, T4 livre, anticorpo anti-peroxidase e hemoglobina A1c. RESULTADOS: DAT foi encontrada em 26 pacientes (20,6%), sendo 11 (8,7%) com hipotireoidismo clínico, 6 (4,8%) com hipotireoidismo subclínico e 9 (7,1%) com tireoidite sem disfun o tireoideana. Em um paciente (0,8%), a DAT (hipertireoidismo) precedeu o DM1. Houve rela o entre DAT e idade atual e no diagnóstico do DM1. N o foram encontradas significancias para sexo, grupo racial, dura o do DM, paridade e local de moradia. CONCLUS ES: A prevalência de DAT é bastante alta para justificar seu rastreamento e está relacionada com a idade atual e a idade do diagnóstico do DM1.
Estudio toxicogenético de un extracto fluido de ocimun basilicum l. (albahaca blanca)
García López,Arilia; Vizoso Parra,ángel; Ramos Ruiz,Alberto; Piloto,Janet;
Revista Cubana de Plantas Medicinales , 2000,
Abstract: the results obtained on evaluating the toxicogenetic potential of a fluid extract with an ethanol menstruum 70 % of ocimun basilicum l. in 3 systems of short-term tests are presented. 2 in vitro models were used: the salmonella/microsome system (ames) and that of mitotic segregation with the aspergillus nidulans d-30 fungus. another in vivo model that uses the micronucleus induction test in mouse bone marrow was also included. a positive response was observed in the ames±test with the strains of salmonella typhimurium ta-98 with metabolic activation in the range of concentrations of 1 500 and 5 000 m g/plate and ta-1535 without metabolic activation in the range of concentrations of 50, 150, 500 and 1 500 m g/plate. concentrations from 0,005 to 1,00 mg of total solids/ml were evaluated in the mitotic segregation test. no significant concentration-depending increases were found in the frequency of segregating sectors by colonies (fsc). in the micronucleus induction test, doses of 500, 1 000 and 2 000 mg/kg of body weight were assayed. the results showed that the extract of ocimun basilicum l. proved to be mutagenic in the salmonella/microsome system and moderately cytotoxic in the mitototic segregation test. no genetic damage was detected in this assay.
Evaluación del potencial genotóxico de un extracto fluido de incienso (artemisia Absinthium L.)
Piloto Ferrer,Janet; Ramos Ruiz,Alberto; Vizoso Parra,ángel; García López,Arilia;
Revista Cubana de Plantas Medicinales , 2000,
Abstract: we assessed mytagenic activity of a fluid extract from artemisia absinthium l. (incense) prepared with an 70 % ethanol menstrum. two test were used: ames′ test and micronuclei induction test in bone marrow of the mouse. in the former one, results were negatives in all strains of salmonella typhimurium tested: ta 1535, ta 1537, ta 98, and ta 100, using a plateincorporation protocol and concentrations up to 5 mg/plate. in micronuclei trial, two oral administration were made at a rate of 10 ml/kg 24 hours apart, sacrifice was performed 24 hours after the last application. doses were of 500, 1 000, and 2 000 mg/kg. there weren′t variations in relationship between polychromatic erythrocytes (pce), and the normochromatic ones (nce), indicator of medullary toxicity. neither we found significant alterations in micronucleated pce frequency amongst different groups of treatment.
Ausencia de potencial genotóxico in vitro e in vivo de un extracto fluido de PIPER AURITUM H.K.B.
Vizoso Parra,Angel; García López,Arilia; Ramos Ruiz,Alberto;
Revista Cubana de Plantas Medicinales , 1999,
Abstract: we present results obtained in evaluation of genotoxic potential of a fluid extract, using ethanolic menstrum to 70 % from piper auritumh.k.b. (caisimón de anís) in three short term trial systems, two in vitro, using ames trial, and d-30 aspergillus nidulans system (somatic segregation trial), and other in vitro, using micronuclei induction test in mouse bone marrow. in ames trial, we evaluated concentrations in a rank of 50 to 5 000 μg/plate to strains ta-1535, ta-100, and ta-98 as well as to strain ta-1537 of 500 to 5 000 μg/plate. in somatic segregation trial, concentrations of 0,06 to 1,80 mg of total solids /ml, were analyzed. for micronuclei induction, a doserank of 283,00 to 1 134,63 mg/kg of body weight (b.w.) was assayed. results obtained showed that fluid extract from piper auritum h.k.b., was moderately cytotoxic in d-30 aspergillus nidulans system, but not in ames trial, and in micronuclei test. there wasn't genotoxic response in all three systems used.
Ausencia de potencial genotóxico in vitro e in vivo de un extracto fluido de PIPER AURITUM H.K.B.
Angel Vizoso Parra,Arilia García López,Alberto Ramos Ruiz
Revista Cubana de Plantas Medicinales , 1999,
Abstract: Se presentan los resultados obtenidos al evaluar el potencial genotóxico de un extracto fluido con un menstruo etanólico al 70 % de Piper auritum H K.B. (caisimón de anís) en 3 sistemas de ensayo a corto plazo, 2 in vitro, empleando el ensayo de Ames y el sistema Aspergillus nidulans D-30 (ensayo de segregación somática) y otro in vivo, utilizando la prueba de inducción de micronúcleos en médula ósea de ratón. En el ensayo de Ames se evaluaron concentraciones en un rango de 50 a 5 000 μg/placa para las cepas TA-1535, TA-100 y TA-98 y para la cepa TA-1537 de 500 a 5 000 μg/placa. En el ensayo de segregación somática se probaron concentraciones de 0,06 a 1,80 mg de sólidos totales/mL. Para la prueba de inducción de micronúcleos se ensayaron un rango de dosis de 283,00 a 1 134,63 mg/kg de peso corporal (pc). Los resultados obtenidos demuestran que el extracto fluido de Piper auritum H.K.B. fue moderadamente citotóxico en el sistema Aspergillus nidulans D-30, no comportándose así en el ensayo de Ames, ni en la prueba de micronúcleos. No se observó respuesta genotóxica en los 3 sistemas empleados. We present results obtained in evaluation of genotoxic potential of a fluid extract, using ethanolic menstrum to 70 % from Piper auritumH.K.B. (caisimón de anís) in three short term trial systems, two in vitro, using Ames trial, and D-30 Aspergillus nidulans system (somatic segregation trial), and other in vitro, using micronuclei induction test in mouse bone marrow. In Ames trial, we evaluated concentrations in a rank of 50 to 5 000 μg/plate to strains TA-1535, TA-100, and TA-98 as well as to strain TA-1537 of 500 to 5 000 μg/plate. In somatic segregation trial, concentrations of 0,06 to 1,80 mg of total solids /mL, were analyzed. For micronuclei induction, a doserank of 283,00 to 1 134,63 mg/kg of body weight (B.W.) was assayed. Results obtained showed that fluid extract from Piper auritum H.K.B., was moderately cytotoxic in D-30 Aspergillus nidulans system, but not in Ames trial, and in micronuclei test. There wasn't genotoxic response in all three systems used.
Derivados antraquinónicos del Aloe vera L: Tamizaje genotóxico
ángel Vizoso Parra,Arilia García López,Alberto Ramos Ruiz,Janet Piloto Fererr
Revista Cubana de Plantas Medicinales , 2000,
Abstract: Se presentan los resultados obtenidos al tamizar el posible efecto mutagénico de un extracto de derivados antraquinónicos del Aloe vera L. en 3 sistemas de ensayo a corto plazo, 2 in vitro empleando el ensayo de Ames y la prueba de segregación mitótica en el hongo Aspergillus nidulans D-30 y otro in vitro utilizando el ensayo de inducción de micronúcleos en médula ósea de ratón. En el ensayo de Ames se evaluaron concentraciones hasta 5 mg/placa para las cepas TA-1535, TA-1537, TA-98 y TA-100. En el ensayo de segregación mitótica se probaron concentraciones hasta 0,730 mg de sólidos totales/mL de medio completo. Para el ensayo de inducción de micronúcleos se ensayaron un rango de dosis de 500, 1 000 y 2 000 mg/kg de peso corporal del roedor. Los resultados obtenidos demuestran que el extracto de derivados antraquinónicos del Aloe vera L. fue genotóxico en el ensayo de Ames en la cepa TA-1537 con activación metabólica; no presentó efecto citotóxico ni genotóxico en el ensayo de segregación mitótica. En la prueba in vivo no indujo respuesta genotóxica significativa en la frecuencia de micronúcleos en los eritrocitos policromáticos ni da o medular. Results obtained are based on sifting through of possible mutagenic effect of and extract from anthraquinone derivatives of Aloe vera L. In three short-term trial systems, two of them were in vitro using Ames′ trial and mitotic segregation test in D-30 Aspergillus nidulans fungus, and another in vitro too, using micronuclei induction trial in bone marrow of mouse. In Ames′ trial concentrations up to 5 mg/plate for TA-1535, TA-1537, TA-98 and TA-100 strains, were assessed. In mitotic segregation, concentrations up to 0,730 mg of total solids/mL of complete culture medium. For micronuclei induction trial, a dose rank of 500, 1 000, and 2 000 mg/kg of body weight of rodent was analysed. Results obtained show that extract anthraquinone derivatives of Aloe vera L. was genotoxic in Ames′ trial in TA-1537 stran with metabolic activation hasn′t neither the cytotoxic nor genotoxic effect in mytotic segregation trial. In in vitro test, there wasn′t a significant genotoxic response in frequency of micronuclei in polychromatic red cells and medullary damage.
Extracto hidroalcohólico de cera de ca a no induce da o genético
ángel Vizoso Parra,Arilia García López,Alberto Ramos Ruiz,Aida Villaescusa González
Revista Cubana de Plantas Medicinales , 2002,
Abstract: El empleo de las plantas medicinales y sus derivados en la medicina tradicional halla su expresión natural y su desarrollo ulterior en la atención primaria de la salud. Cuba ha sabido aprovechar su rica flora y su vasta tradición en el empleo de los fitofármacos. Dentro de estos productos alternativos se encuentra la cera de ca a con propiedades farmacológicas reconocidas (antiinflamatoria, cicatrizante, etc.), la cual es obtenida como subproducto en el proceso de elaboración del azúcar. Los estudios genotóxicos se llevaron a cabo empleando 3 sistemas de ensayos a corto plazo, 2 in vitro y 1 in vivo. Para las pruebas in vitro se emplearon los ensayos de Salmonella/Microsomas (Ames) y segregación mitótica (Aspergillus nidulans D- 30) a una concentración máxima del producto de 5 mg/placa y 1,00 mg/mL, respectivamente. En el ensayo in vivo de inducción de micronúcleos en médula ósea de ratón se emplearon dosis hasta de 2 000 mg/kg de peso corporal. Los resultados obtenidos demuestran que el extracto hidroalcohólico de cera de ca a no tiene efecto mutagénico en ninguno de los ensayos empleados. The utilization of medicinal plants and their derivatives in traditional medicine finds its natural expression and its further development in primary health care. Cuba has taken advantage of its rich flora and of its vast tradition in the use of phytodrugs. The sugar cane wax is among these alternative products. It is obtained as a by-product in the sugar manufacture process and it has well-known pharmacological properties (antiinflammatory, healing, etc.). The genotoxic studies were conducted by using 3 short-term test systems, 2 in vitro and 1 in vivo. The tests of Salmonella/Microsomas (Ames) and mitotic segregation (Aspergillus nidulans D-30) were used for in vitro assays at a maximum concentration of the product of 5 mg/plate and 1.00 mg/mL, respectively. In the in vivo test of micronucleus induction in mouse bone marrow, doses of up to 2 000 mg/kg of body weight were used. The results showed that the hydroalcoholic extract of sugar cane wax has no mutagenic effect on any of the tests used.
Page 1 /233417
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.