oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 267 )

2018 ( 492 )

2017 ( 509 )

2016 ( 764 )

Custom range...

Search Results: 1 - 10 of 376172 matches for " Jhon D Ríos-Salazar "
All listed articles are free for downloading (OA Articles)
Page 1 /376172
Display every page Item
Actividad antioxidante in vitro de extractos de tallos de Polygala sp.
Puertas-Mejía,Miguel A; Ríos-Salazar,Jhon D; Sáez-Vega,Jairo A;
Revista Cubana de Plantas Medicinales , 2009,
Abstract: introduction: from long time ago, the use of natural extracts with therapeutical properties has been very important for control of many human and plant diseases. from the medicinal point of view some reports are studied in relation to biological activity of polygala sp. species. it entails that this plant may be a promissory source of compounds having a high level of antioxidant activity. objective: to isolate, identify and assess the antioxidant extracts activity and of some of its constituents. methods: dried and pulverized stems of poygala sp. underwent a percolation with methanol and dichloromethane; respective extracts underwent a column chromatography and two compounds were isolated and identified by nuclear magnetic resonance spectroscopy. antioxidant potential was determined on the base of trapping ability of stable radical 2,2-diphenyl -1-picrylhydraziyl. results: study of chemical composition of stem extracts allowed us to identify two lignins type 2,7-cyclolignans-9 olides, identified as a- and b-peltatin. conclusions: data from this study demonstrate that all assessed samples have antioxidant properties supporting the traditional use of polygala spp. for the treatment of different diseases.
Actividad antioxidante in vitro de extractos de tallos de Polygala sp. In vitro antioxidant activity of extracts from Polygala sp. stems
Miguel A Puertas-Mejía,Jhon D Ríos-Salazar,Jairo A Sáez-Vega
Revista Cubana de Plantas Medicinales , 2009,
Abstract: INTRODUCCIóN: desde hace mucho tiempo, el empleo de extractos naturales con propiedades terapéuticas ha sido de gran importancia para el control de muchas enfermedades en humanos y plantas. Desde el punto de vista medicinal se encuentran bajo estudio algunos reportes sobre la actividad biológica de la especie Polygala sp. Lo anterior permite suponer que esta planta puede ser una fuente promisoria de compuestos con una alta actividad antioxidante. OBJETIVO: aislar, identificar y evaluar la actividad antioxidante de extractos y algunos de sus componentes. MéTODOS: tallos secos y pulverizados de Poygala sp. fueron sometidos a percolación con metanol y diclorometano; sus respectivos extractos se sometieron a cromatografía en columna y 2 compuestos fueron aislados e identificados por espectroscopia de resonancia magnética nuclear. El potencial antioxidante se determinó sobre la base de la capacidad de atrapamiento del radical estable 2,2-difenil-1-picrilhidrazilo (DPPH·, 2-2-diphenyl-1-picrylhydrazyl). RESULTADOS: el estudio de la composición química de los extractos de los tallos permitió la identificación de 2 lignanos de tipo 2,7′-ciclolignanos-9′-olidos, conocidos como a- y b-peltatina. CONCLUSIONES: los datos presentados en este estudio demostraron que todas las muestras evaluadas poseen propiedades antioxidantes, lo cual soporta el uso tradicional de Polygala spp. para el tratamiento de diferentes enfermedades. INTRODUCTION: from long time ago, the use of natural extracts with therapeutical properties has been very important for control of many human and plant diseases. From the medicinal point of view some reports are studied in relation to biological activity of Polygala sp. species. It entails that this plant may be a promissory source of compounds having a high level of antioxidant activity. OBJECTIVE: to isolate, identify and assess the antioxidant extracts activity and of some of its constituents. METHODS: dried and pulverized stems of Poygala sp. underwent a percolation with methanol and dichloromethane; respective extracts underwent a column chromatography and two compounds were isolated and identified by nuclear magnetic resonance spectroscopy. Antioxidant potential was determined on the base of trapping ability of stable radical 2,2-diphenyl -1-picrylhydraziyl. RESULTS: study of chemical composition of stem extracts allowed us to identify two lignins type 2,7-cyclolignans-9 olides, identified as a- and b-peltatin. CONCLUSIONS: data from this study demonstrate that all assessed samples have antioxidant properties supporting the traditional use
Prevalence of lifestyle-related cardiovascular risk factors in Peru: the PREVENCION study
Medina-Lezama,Josefina; Morey-Vargas,Oscar L.; Zea-Díaz,Humberto; Bola?os-Salazar,Juan F.; Corrales-Medina,Fernando; Cuba-Bustinza,Carolina; Chirinos-Medina,Diana A.; Chirinos,Julio A.;
Revista Panamericana de Salud Pública , 2008, DOI: 10.1590/S1020-49892008000900003
Abstract: objectives: to estimate the prevalence of lifestyle-related cardiovascular risk factors in the adult population of arequipa, the second largest city in peru. methods: the prevalence and patterns of smoking, alcohol drinking, lack of physical activity, high-fat diet, and low fruit and vegetable intake were evaluated among 1 878 subjects (867 men and 1 011 women) in a population-based study. results: the age-standardized prevalence of current smoking, former smoking, and never smoking were 21.6%, 14.3%, and 64.1%, respectively. the prevalence of current smoking was significantly higher in men than women (31.1% vs. 12.1%; p < 0.01). the prevalence of current alcohol use was 37.7% and significantly higher in men than women (55.5% vs. 19.7%; p < 0.01). similarly, the prevalence of binge drinking was 21.2%, and the percentage of men who binge drink (36.1%) was significantly higher than for women (6.4%; p < 0.01). the vast majority of alcohol drinkers reported a pattern of alcohol consumption mainly on weekends and holidays rather than regular drinking with meals during the week. the proportion of insufficiently active people was 57.6% and was significantly higher in women than men (63.3% vs. 51.9%; p < 0.01). overall, 42.0% of adults reported consuming high-fat diets, 34.5% reported low fruit intake, and 33.3% reported low vegetable intake. conclusions: the high prevalence of lifestyle-related cardiovascular risk factors found in this andean population is of concern. preventive programs are urgently needed to deal with this growing problem.
Introducción a la teoría geométrica de grupos
SALAZAR-DíAZ,OLGA; VERGARA-RíOS,GRABIEL;
Revista Integración , 2011,
Abstract: abstract. in this article we will give an introduction to geometric group theory. we will see how from a finite presentation of a group, we can give this group a metric space structure. we discuss the action of the group on this space and we study geometric properties preserved under quasiisometry.
OBTENCIóN DE OLEORRESINA DE PIMENTóN (Capsicum annuum L.)
CARDONA. R.,Jhon A; LOPERA M.,Guillermo L.; MONTOYA R.,Alejandra M.; MONTOYA V.,Ana M.; PE?A A.,Juan D.; GIL M.,Manuela; BENAVIDES,Julie F.; R.,María; RíOS,Luis A.; RESTREPO V.,Gloria M.;
Vitae , 2006,
Abstract: oleoresin from sweet pepper (capsicum annuum l.), which contains mainly carotenoids, capsaicinoids and some vitamins, has been currently used in the food industry. and is obtained with the following procedure: a) scalding, b) chopping, c) drying, d) milling, and e) solvent extraction (hexane, acetone, ethyl acetate). extracted pigments are analyzed using reverse phase hplc and the results are compared with the oleoresin obtained from comercial paprika imported by tecnas?. the yield achieved in the laboratory is 3-6%. the results show that scalding and drying are important: the scalding allows to reach an humidity of 13.56% in 320 min (without scalding the humidity reached is 21.01%) and the drying allows extraction with solvents.
Interferencia lingüística en el aprendizaje simultáneo de varias lenguas extranjeras
Buitrago,Sandra Hibeth; Ramírez,José Fernando; Ríos,Jhon Fredy;
Revista Latinoamericana de Ciencias Sociales, Ni?ez y Juventud , 2011,
Abstract: foreign languages teachers at university de caldas have observed that the students, who are learning more than two foreign languages simultaneously, mix words and expressions of the different languages they are learning while using one of them. in these terms, this study analyzes the phenomenon as a linguistic interference, based on authentic texts written by 20 students who belong to the modern languages program at the same university.
Interferencia lingüística en el aprendizaje simultáneo de varias lenguas extranjeras
Sandra Hibeth Buitrago,José Fernando Ramírez,Jhon Fredy Ríos
Revista Latinoamericana de Ciencias Sociales, Ni?ez y Juventud , 2011,
Abstract: Foreign languages teachers at University de Caldas have observed that the students, who are learningmore than two foreign languages simultaneously, mix words and expressions of the different languages they are learning while using one of them. In these terms, this study analyzes the phenomenon as a linguistic interference, based on authentictexts written by 20 students who belong to the Modern Languages Program at the same University.
Human native lipoprotein-induced de novo DNA methylation is associated with repression of inflammatory genes in THP-1 macrophages
Rubén Rangel-Salazar, Marie Wickstr?m-Lindholm, Carlos A Aguilar-Salinas, Yolanda Alvarado-Caudillo, Kristina BV D?ssing, Manel Esteller, Emmanuel Labourier, Gertrud Lund, Finn C Nielsen, Dalia Rodríguez-Ríos, Martha O Solís-Martínez, Katarzyna Wrobel, Kazimierz Wrobel, Silvio Zaina
BMC Genomics , 2011, DOI: 10.1186/1471-2164-12-582
Abstract: Native lipoprotein-induced de novo DNA methylation was associated with a general repression of various critical genes for macrophage function, including pro-inflammatory genes. Lipoproteins showed differential effects on epigenetic marks, as de novo DNA methylation was induced by VLDL and to a lesser extent by LDL, but not by HDL, and VLDL induced H4K20 hypermethylation, while HDL caused H4 deacetylation. The analysis of candidate factors mediating VLDL-induced DNA hypermethylation revealed that this response was: 1) surprisingly, mediated exclusively by the canonical maintenance DNA methyltransferase DNMT1, and 2) independent of the Dicer/micro-RNA pathway.Our work provides novel insights into epigenetic gene regulation by native lipoproteins. Furthermore, we provide an example of DNMT1 acting as a de novo DNA methyltransferase independently of canonical de novo enzymes, and show proof of principle that de novo DNA methylation can occur independently of a functional Dicer/micro-RNA pathway in mammals.Atherosclerosis is characterised by the accumulation of lipids, extracellular matrix, smooth muscle, inflammatory and immune cells in the arterial wall [1]. Diet-related and environment-related factors are pivotal determinants of atherosclerosis risk, thus epigenome remodelling by such factors has been proposed as an important underlying molecular mechanism for that disease [2]. According to this view, environmental and nutritional risk factors might impose stable epigenetic "hits" during an individual's lifetime that, possibly in synergy with other concomitant molecular changes, cause anti- or pro-atherogenic gene expression patterns [3,4]. Indeed, altered DNA methylation patterns have been detected in atherosclerosis [5-7]. Such changes may at least in part be caused by abnormal lipoprotein profiles, given their central role in atherogenesis [1]. This idea is supported by our previous observation that a very low density- and low density lipoprotein (VLDL and LDL, res
Predictors of mortality and adverse outcome in elderly high-risk patients undergoing percutaneous coronary intervention
Miranda Malpica, Emma;Pe?a Duque, Marco Antonio;Castellanos, José;Exaire, Emilio;Arrieta, Oscar;Salazar Dávila, Eduardo;Villavicencio Fernández, Ramón;Delgadillo-Rodríguez, Hilda;González-Quesada, Carlos J;Martínez-Ríos, Marco A;
Archivos de cardiología de México , 2007,
Abstract: objectives: we sought to identify predictors of in-hospital and long-term (> 1 year) mortality and major adverse cardiac events (mace) in elderly patients referred for percutaneous coronary intervention (pci). methods: seventy-three patients (> 80 years) were included. clinical and interventional characteristics were collected retrospectively. primary end points were in-hospital and long-term mortality, and a composite of non-fatal myocardial infarction, target vessel revascularization, urgent coronary artery bypass graft surgery, and death (mace). results: eighty-three percent of the patients had acute coronary syndromes, 43% three-vessel disease, and 42% heart failure. in-hospital mortality and mace were 16.4% and 19%, respectively. long-term mortality and mace were 11.3% and 16.4%, respectively. univariate characteristics associated with in-hospital mortality and mace were: killip class iii-iv, heart failure, cardiogenic shock, timi 0-2 flow prior and after intervention, diabetes mellitus, contrast nephropathy, and presence of a-v block or atrial fibrillation (af). long term predictors for mortality were the presence of heart failure, cardiogenic shock, diabetes mellitus, timi flow 0-2 before and after intervention, and a-v block or af. conclusion: the identification of the factors previously mentioned may help to predict complications in elderly patients.
Actividad biológica de los aceites esenciales de Acmella ciliata (Kunth) Cass
Rincón Mejía,Carlos Andrés; Casta?o Osorio,Jhon Carlos; Ríos Vázquez,Eunice;
Revista Cubana de Plantas Medicinales , 2012,
Abstract: introduction: acmella ciliata (kunth) cass. is a native weed of northern south america known by its aliphatic alkamide content and used as an anesthetic and analgesic for toothache and sore throat. objective: to obtain, to analyze and to evaluate the biological activities of essential oils from acmella ciliata (kunth) cass flowers and leaves. methods: acmella ciliata essential oils were obtained by hydrodistillation and microwave-assisted hydrodistillation and analyzed by gas chromatography coupled to mass spectrometry. the biological activity of both essential oils was determined by using the modified agar-well diffusion assay, evaluating their activities against five bacteria and one fungus, along with tests of toxicity in artemia salina (lethal dose 50). results: microwave-assisted hydrodistillation was the technique with the best performances in the extraction of acmella ciliata. essential oils. their volatile fractions contain a high proportion of sesquiterpenes such as β-trans-caryophyllene, the major component. essential oils at two different concentrations (25 mg/ml and 15 mg/ml) showed a strong antimicrobial activity against gram-positive bacteria staphylococcus aureus and staphylococcus epidermidis, in addition they exhibited low toxicity against artemia salina, presenting mean lethal doses of 176, 156 and 100,104 ppm for the essential oils from leaves and flowers, respectively. conclusions: acmella ciliata essential oils are products with high content of terpenoids and marked antimicrobial activity against gram-positive bacteria (staphylococcus aureus and staphylococcus epidermidis) and low toxicity against artemia salina.
Page 1 /376172
Display every page Item


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