Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 34
Filtrar
1.
Chemosphere ; 358: 142140, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38688348

RESUMEN

Carbon-encapsulated iron oxide nanoparticles (CE-nFe) have been obtained from an industrial waste (oil mill wastewater-OMW, as a carbonaceous source), and using iron sulfate as metallic precursor. In an initial step, the hydrochar obtained has been thermally activated under an inert atmosphere at three different temperatures (600 °C, 800 °C and 1000 °C). The thermal treatment promotes the development of core-shell nanoparticles, with an inner core of α-Fe/Fe3O4, surrounded by a well-defined graphite shell. Temperatures above 800 °C are needed to promote the graphitization of the carbonaceous species, a process promoted by iron nanoparticles through the dissolution, diffusion and growth of the carbon nanostructures on the outer shell. Breakthrough column tests show that CE-nFe exhibit an exceptional performance for H2S removal with a breakthrough capacity larger than 0.5-0.6 g H2S/gcatalyst after 3 days experiment. Experimental results anticipate the crucial role of humidity and oxygen in the adsorption/catalytic performance. Compared to some commercial samples, these results constitute a three-fold increase in the catalytic performance under similar experimental conditions.


Asunto(s)
Carbono , Sulfuro de Hidrógeno , Residuos Industriales , Carbono/química , Residuos Industriales/análisis , Sulfuro de Hidrógeno/química , Adsorción , Catálisis , Hierro/química , Aguas Residuales/química , Nanopartículas/química , Compuestos Férricos/química
2.
Environ Res ; 251(Pt 2): 118672, 2024 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-38508360

RESUMEN

A series of TiO2 - based photocatalysts have been prepared by the incorporation of 10 wt% of various carbon-based nanomaterials as modifying agents to titania. More specifically, commercial TiO2 P25 was modified through a wet impregnation approach with methanol with four different carbon nanostructures: single-walled carbon nanotubes (SWCNTs), partially reduced graphene oxide (prGO), graphite (GI), and graphitic carbon nitride (gCN). Characterization results (XPS and Raman) anticipate the occurrence of important interfacial phenomena, preferentially for samples TiO2/SWCNT and TiO2/prGO, with a binding energy displacement in the Ti 2p contribution of 1.35 eV and 1.54 eV, respectively. These findings could be associated with an improved electron-hole mobility at the carbon/oxide interface. Importantly, these two samples constitute the most promising photocatalysts for Rhodamine B (RhB) photodegradation, with nearly 100% conversion in less than 2 h. These promising results must be associated with intrinsic physicochemical changes at the formed heterojunction structure and the potential dual-role of the composites able to adsorb and degrade RhB simultaneously. Cyclability tests confirm the improved performance of the composites (e.g., TiO2/SWCNT, 100% degradation in 1 h) due to the combined adsorption/degradation ability, although the regeneration after several cycles is not complete due to partial blocking of the inner cavities in the carbon nanotubes by non-reacted RhB. Under these reaction conditions, Rhodamine-B xanthene dye degrades via the de-ethylation route.


Asunto(s)
Nanotubos de Carbono , Titanio , Titanio/química , Catálisis , Nanotubos de Carbono/química , Rodaminas/química , Fotólisis , Carbono/química , Procesos Fotoquímicos , Grafito/química , Grafito/efectos de la radiación
3.
Inorg Chem ; 61(47): 18861-18872, 2022 Nov 28.
Artículo en Inglés | MEDLINE | ID: mdl-36378868

RESUMEN

A series of UiO-66 materials with different functional groups (-H, -NH2, and -NO2) have been evaluated for the adsorption and release of a common ocular drug such as brimonidine tartrate. UiO-66 samples were synthesized under solvothermal conditions and activated by solvent exchange with ethanol. Experimental results suggest that the incorporation of surface functionalities gives rise to the development of structural defects (missing linker defects) but without altering the basic topology of the UiO-66 framework. These defects improve the adsorption performance of the parent metal-organic framework (MOF), while the bulkier functionalities infer slower release kinetics, with the associated benefits for prolonged delivery of brimonidine. Among the evaluated MOFs, defective UiO-66-NO2 can be proposed as the most promising candidate due to the combination of a larger brimonidine volumetric uptake (680 mg/cm3), a prolonged delivery (period of up to 25 days), a small particle size, and a larger instability. Contrariwise, at high concentrations UiO-66-NO2 has higher toxicity toward human retinal pigment epithelium cells (ARPE-19) compared to the pure and NH2-functionalized UiO-66.


Asunto(s)
Estructuras Metalorgánicas , Humanos , Estructuras Metalorgánicas/farmacología , Estructuras Metalorgánicas/química , Adsorción , Preparaciones Farmacéuticas , Dióxido de Nitrógeno , Tartrato de Brimonidina/farmacología
4.
ACS Appl Mater Interfaces ; 12(27): 30189-30197, 2020 Jul 08.
Artículo en Inglés | MEDLINE | ID: mdl-32530261

RESUMEN

Novel MOF-based polymer nanocomposite films were successfully prepared using Zr-based UiO-67 as a metal-organic framework (MOF) and polyurethane (PU) as a polymeric matrix. Synchrotron X-ray powder diffraction (SXRPD) analysis confirms the improved stability of the UiO-67 embedded nanocrystals, and scanning electron microscopy images confirm their homogeneous distribution (average crystal size ∼100-200 nm) within the 50 µm thick film. Accessibility to the inner porous structure of the embedded MOFs was completely suppressed for N2 at cryogenic temperatures. However, ethylene adsorption measurements at 25 °C confirm that at least 45% of the MOF crystals are fully accessible for gas-phase adsorption of nonpolar molecules. Although this partial blockage limits the adsorption performance of the embedded MOFs for ocular drugs (e.g., brimonidine tartrate) compared to the pure MOF, an almost 60-fold improvement in the adsorption capacity was observed for the PU matrix after incorporation of the UiO-67 nanocrystals. The UiO-67@PU nanocomposite exhibits a prolonged release of brimonidine (up to 14 days were quantified). Finally, the combined use of SXRPD, thermogravimetric analysis (TGA), and Fourier transform infrared (FTIR) analyses confirmed the presence of the drug in the nanocomposite film, the stability of the MOF framework and the drug upon loading, and the presence of brimonidine in an amorphous phase once adsorbed. These results open the gate toward the application of these polymeric nanocomposite films for drug delivery in ocular therapeutics, either as a component of a contact lens, in the composition of lacrimal stoppers (e.g., punctal plugs), or in subtenon inserts.


Asunto(s)
Sistemas de Liberación de Medicamentos/métodos , Tartrato de Brimonidina/química , Estructuras Metalorgánicas/química , Nanocompuestos/química , Espectroscopía Infrarroja por Transformada de Fourier , Termogravimetría
5.
Nat Commun ; 10(1): 2345, 2019 05 28.
Artículo en Inglés | MEDLINE | ID: mdl-31138802

RESUMEN

Widespread access to greener energy is required in order to mitigate the effects of climate change. A significant barrier to cleaner natural gas usage lies in the safety/efficiency limitations of storage technology. Despite highly porous metal-organic frameworks (MOFs) demonstrating record-breaking gas-storage capacities, their conventionally powdered morphology renders them non-viable. Traditional powder shaping utilising high pressure or chemical binders collapses porosity or creates low-density structures with reduced volumetric adsorption capacity. Here, we report the engineering of one of the most stable MOFs, Zr-UiO-66, without applying pressure or binders. The process yields centimetre-sized monoliths, displaying high microporosity and bulk density. We report the inclusion of variable, narrow mesopore volumes to the monoliths' macrostructure and use this to optimise the pore-size distribution for gas uptake. The optimised mixed meso/microporous monoliths demonstrate Type II adsorption isotherms to achieve benchmark volumetric working capacities for methane and carbon dioxide. This represents a critical advance in the design of air-stable, conformed MOFs for commercial gas storage.

6.
Biomed Opt Express ; 10(3): 1111-1125, 2019 Mar 01.
Artículo en Inglés | MEDLINE | ID: mdl-30891333

RESUMEN

OCT instruments permit fast and non-invasive 3D optical biopsies of biological tissues. However, they are bulky and expensive, making them only affordable at the hospital and thus, not sufficiently used as an early diagnostic tool. Significant reduction of system cost and size is achieved by implementation of MOEMS technologies. We propose an active array of 4x4 Mirau microinterferometers where the reference micro-mirrors are carried by a vertical comb-drive microactuator, enabling the implementation of the phase-shifting technique that improves the sensitivity and eliminates unwanted interferometric terms. We focus on the design of the imaging system, the microfabrication and the assembly of the Mirau microinterferometer, and the swept-source OCT imaging.

7.
Dalton Trans ; 45(13): 5444-50, 2016 Apr 07.
Artículo en Inglés | MEDLINE | ID: mdl-26959701

RESUMEN

Cationic mono-, di-, tri- and tetra-nuclear silver complexes with Buchwald-type phosphane (XPhos) and cyclooctatetraene (COT) have been synthesized and characterized. Formation of [(XPhos-Ag)n(COT)][SbF6]n (n = 1 and 2) complexes was confirmed by single-crystal X-ray crystallography and multinuclear NMR spectroscopy. Variable-temperature NMR spectroscopy in CD2Cl2 solution shows the fluxionality of the COT ring in the mono-Ag(i) XPhos complex. Fluxionality of COT was also confirmed in the case of the di-Ag(i) XPhos complex by solid-state and solution (31)P NMR spectroscopy. The C-C bond cleavage of coordinated acetonitrile [XPhos-Ag(i)-NCCH3] resulting in cyanide bridged Ag cluster formation [(XPhos-Ag)2(µ-CN)n(µ-Ag)n-1] (n = 1, 2, 3 and 4) upon light excitation of [(XPhos-Ag)n(COT)] was confirmed by HRESI-MS, UV-Absorption and HR-TEM.

8.
Chem Commun (Camb) ; 52(18): 3639-42, 2016 Mar 04.
Artículo en Inglés | MEDLINE | ID: mdl-26845644

RESUMEN

The gate-opening phenomenon in ZIFs is of paramount importance to understand their behavior in industrial molecular separations. Here we show for the first time using in situ inelastic neutron scattering (INS) the swinging of the -CH3 groups and the imidazolate linkers in the prototypical ZIF-8 and ZIF-8@AC hybrid materials upon exposure to mild N2 pressure.

9.
Chem Commun (Camb) ; 51(75): 14191-4, 2015 Sep 28.
Artículo en Inglés | MEDLINE | ID: mdl-26256926

RESUMEN

One of the main concerns in the technological application of several metal-organic frameworks (MOFs) relates to their structural instability under pressure (after a conforming step). Here we report for the first time that mechanical instability can be highly improved via nucleation and growth of MOF nanocrystals in the confined nanospace of activated carbons.


Asunto(s)
Carbono/química , Nanopartículas/química , Compuestos Organometálicos/química , Estructuras Metalorgánicas , Estructura Molecular
10.
Langmuir ; 30(41): 12220-8, 2014 Oct 21.
Artículo en Inglés | MEDLINE | ID: mdl-25255054

RESUMEN

With global warming becoming one of the main problems our society is facing nowadays, there is an urgent demand to develop materials suitable for CO2 storage as well as for gas separation. Within this context, hierarchical porous structures are of great interest for in-flow applications because of the desirable combination of an extensive internal reactive surface along narrow nanopores with facile molecular transport through broad "highways" leading to and from these pores. Deep eutectic solvents (DESs) have been recently used in the synthesis of carbon monoliths exhibiting a bicontinuous porous structure composed of continuous macroporous channels and a continuous carbon network that contains a certain microporosity and provides considerable surface area. In this work, we have prepared two DESs for the preparation of two hierarchical carbon monoliths with different compositions (e.g., either nitrogen-doped or not) and structure. It is worth noting that DESs played a capital role in the synthesis of hierarchical carbon monoliths not only promoting the spinodal decomposition that governs the formation of the bicontinuous porous structure but also providing the precursors required to tailor the composition and the molecular sieve structure of the resulting carbons. We have studied the performance of these two carbons for CO2, N2, and CH4 adsorption in both monolithic and powdered form. We have also studied the selective adsorption of CO2 versus CH4 in equilibrium and dynamic conditions. We found that these materials combined a high CO2-sorption capacity besides an excellent CO2/N2 and CO2/CH4 selectivity and, interestingly, this performance was preserved when processed in both monolithic and powdered form.

11.
Clin Anat ; 25(8): 983-5, 2012 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-22730067

RESUMEN

This study investigated the frequency of an accessory pudendal artery in 15 adult cadavers fixed with formaldehyde solution. The prevalence of accessory pudendal artery varies between 7 and 75% according to the method of identification (imaging studies, microstereoscopic cadaveric dissection, and open and laparoscopic surgeries). Currently, under discussion is the role of this artery in postprostatectomy erectile dysfunction. Accordingly, it is important to know the true prevalence to appreciate its clinical significance. The internal pudendal system was examined through direct dissection, and findings were compared with the different methods of identification published.


Asunto(s)
Arterias/anomalías , Genitales Masculinos/irrigación sanguínea , Pelvis/irrigación sanguínea , Perineo/irrigación sanguínea , Adulto , Cadáver , Disección , Humanos , Masculino , Prevalencia
12.
Rev. int. androl. (Internet) ; 10(1): 11-20, ene.-mar. 2012.
Artículo en Español | IBECS | ID: ibc-100436

RESUMEN

Introducción: La disfunción eréctil (DE) es un problema de salud importante que afecta a la calidad de vida de millones de personas, hecho que ha adquirido importancia, tanto en estudios individuales como poblacionales, en la calidad de la atención médica y eficacia de las intervenciones a nivel de salud pública. Objetivos: Valorar la calidad de vida y comorbilidades de pacientes, con y sin DE, en atención primaria. Material y método: Pacientes: los participantes se captaron en los centros de salud incluidos en el estudio. Se reclutó una muestra de 210 varones, de los cuales 31 no pudieron concluir el estudio por diversos motivos (n final = 179). Análisis de variables: la variable principal, de carácter cualitativo, es la ausencia o presencia de DE. Las variables secundarias se distribuyen según 3 campos: demográficas, bioquímicas y comorbilidades con fármacos asociados, además de las variables de grado de DE y calidad de vida, mediante el cuestionario de salud sexual del varón y el cuestionario de satisfacción con la vida, respectivamente. Análisis estadístico: estudio de observación, descriptivo y analítico, de sección transversal. Variables cuantitativas: comparación entre medias con la prueba t de Student para grupos independientes o la U de Mann-Whitney si las condiciones de normalidad (aplicación del test de Kolmogorov-Smirnoff o de Shapiro-Wilks) no se cumplían. Variables cualitativas: prueba de χ2. Resultados: De las 210 personas seleccionadas, completaron correctamente la encuesta 179 (85,2%). La edad media fue de 64,5 ± 11,6 años. Respecto de las variables demográficas, el incremento de los años aumenta la incidencia de DE, llegando al 95% entre 71-86 años. En las variables bioquímicas, se encontró una relación significativa entre la ausencia o existencia de DE con el índice aterogénico y su variable recodificada en riesgo aterogénico alto y bajo (p < 0,04)...(AU)


Introduction: Erectile dysfunction (ED) is an important health problem that affects the quality of life of millions of persons, a fact that has acquired importance both in individual and population studies, quality of medical care and efficacy of the interventions on the public health level. Objectives: To evaluate quality of life and comorbidities of patients with and without ED in Primary Care. Material and methods: Patients: The participants were obtained in the health care centers included in the study. A sample of 210 males were recruited, 31 of whom did not complete the study for different reasons (final no. =179). Analysis of variables: The principal variable, having qualitative character, is the absence or presence of ED. The secondary variables are distributed according to 3 fields: demographic, biochemical and comorbidities with associated drugs as well as the variables grade of ED and quality of life, by questionnaire Sexual Health Inventory for Men and Fugl-Meyer Life Satisfaction Checklist respectively. Statistical analysis: Observation, descriptive and analytic, cross-sectional study. Quantitative variables: comparison between means with Student's T test for independent groups of Mann-Whitney U Test if the normality conditions (application of Kolmogorov-Smirnoff or Shapiro-Wilks test) are not met. Qualitative variables: Chi square test. Results: Of the 210 persons selected, 179 (85.2%) completed the survey correctly. Mean age was 64.5 ± 11.6 years. Regarding the demographic variables, increased age increased the incidence of ED, reaching 95% between 71-86 years. In the biochemical variables, a significant relation was found between absence or existence of ED, with the atherogenic index and its variable recodified in high and low atherogenic risk (p< 0.04). The same occurs with the HDL-cholesterol, transaminase GPT and GGT levels...(AU)


Asunto(s)
Humanos , Masculino , Adulto , Persona de Mediana Edad , Calidad de Vida , Disfunción Eréctil/epidemiología , Disfunción Eréctil/prevención & control , Comorbilidad , Enfermedades Cardiovasculares/epidemiología , Enfermedades Cardiovasculares/prevención & control , Antropometría/métodos , Hipertensión/complicaciones , Factores de Riesgo , Atención Primaria de Salud/métodos , Atención Primaria de Salud , Resultado del Tratamiento , Evaluación de Eficacia-Efectividad de Intervenciones , Encuestas y Cuestionarios
13.
Nutr. hosp ; 26(6): 1355-1362, nov.-dic. 2011. ilus, tab
Artículo en Español | IBECS | ID: ibc-104811

RESUMEN

Objetivo: Conocer la prevalencia del hipotiroidismo subclínico en la población general de un centro de salud urbano y describir las características clínicas y factores de riesgo cardiovascular de los pacientes con hipotiroidismo subclínico. Métodos: Se realizó un estudio observacional descriptivo, transversal, retrospectivo, revisando las historias clínicas de los pacientes incluidos en la muestra desde junio de 2005 hasta julio de 2007. Se analizaron las siguientes variables; Datos generales: edad y sexo. Antecedentes familiares: patología tiroidea y otras enfermedades. Antecedentes personales: cardiovasculares, pulmonares, enfermedades autoinmunes, alteraciones gineco-obstétricas, diabetes, hipertensión (HT), dislipemia, obesidad, alteraciones psiquiátricas y hematológicas. Datos de laboratorio: niveles de TSH, niveles de T4 libre, presencia de anticuerpos antiperoxidasa, niveles de colesterol total y sus fracciones. Resultados: La prevalencia de la muestra de 100 pacientes recogida durante 8 meses fue de 3,8% de la población general mayor de 14 anos, de la cual 79 eran mujeres y 21 eran hombres. El 13% eran diabéticos tipo 2, 23% tenían HT y un 40% tenían dislipemia. Sobrepeso y obesidad estaban presentes en un 26%. El nivel medio de TSH fue 6.92 ± 2,29 μU/ml y el nivel medio de T4 libre fue 1,16 ± 0,16 ng/ml. Conclusiones: La prevalencia del hipotiroidismo subclínico fue 3,8%. sobre todo en mujeres con una edad media de 46 años. La incidencia de factores de riesgo cardiovascular en los sujetos estudiados es mayor en DM (13%), similar a la población general en cuanto a la dislipemia (40%) y obesidad (20%) y menor en HTA (23%). En nuestro estudio no se observa una pauta común en el manejo del hipotiroidismo subclínico, siendo necesaria la implementación y promoción de guías de actuación en Atención Primaria (AU)


Objective: To determine the prevalence of subclinical hypothyroidism in the general population of an urban health center and describe the clinical characteristics and cardiovascular risk factors in patients with subclinical hypothyroidism. Methods: An observational study, retrospective, reviewing the medical histories of patients sampled from June 2005 until July 2007. We analyzed the following variables; facts: age and sex. Family history thyroid disease and other diseases. Personal history: cardiovascular pulmonary autoimmune, alterations gynecology obstetric diabetes, hypertension (HT) dislipemia, obesity, psychiatric alterations and haematological. Laboratory data: novel TSH, free T4, antiperoxidase antibodies, total cholesterol and its fractions. Results: The prevalence of the sample of 100 patients collected over 8 months was 3.8% in the general population over 14 years, of which 79 were women and 21 were men. 13% were type 2 diabetics, 23% had HT and 40% had dyslipidemia. Overweight and obesity were present in 26%. The average level of TSH was 6.92 ± 2.29 μU/ml and the average level of free T4 was 1.16 ± 0.16 ng/ml. Conclusions: Prevalence subclinical hypothyroidism was 3.8%. especially in women with a mean age of 46. The incidence of cardiovascular risk factors in the subjects studied is higher in DM (13%), similar to general population in terms of dyslipidemia (40%) and obesity (23%) and lowest in hypertension (23%). In our study we observed a common pattern in the management of subclinical hypothyroidism, requiring the implementation and promotion of practice guidelines in primary care (AU)


Asunto(s)
Humanos , Hipotiroidismo/complicaciones , Hipertensión/epidemiología , Hipercolesterolemia/epidemiología , Enfermedades Cardiovasculares/epidemiología , Diabetes Mellitus/epidemiología , Factores de Riesgo , Sobrepeso/epidemiología , Obesidad/epidemiología
14.
Nutr Hosp ; 26(6): 1355-62, 2011.
Artículo en Español | MEDLINE | ID: mdl-22411383

RESUMEN

OBJECTIVE: To determine the prevalence of subclinical hypothyroidism in the general population of an urban health center and describe the clinical characteristics and cardiovascular risk factors in patients with subclinical hypothyroidism. METHODS: An observational study, retrospective, reviewing the medical histories of patients sampled from June 2005 until July 2007. We analyzed the following variables; facts: age and sex. Family history thyroid disease and other diseases. Personal History: cardiovascular pulmonary autoimmune, alterations gynecology obstetric diabetes, hypertension (HT) dislipemia, obesity, psychiatric alterations and haematological. Laboratory data: novel TSH, free T4, antiperoxidase antibodies, total cholesterol and its fractions. RESULTS: The prevalence of the sample of 100 patients collected over 8 months was 3.8% in the general population over 14 years, of which 79 were women and 21 were men. 13% were type 2 diabetics, 23% had HT and 40% had dyslipidemia. Overweight and obesity were present in 26%. The average level of TSH was 6.92 ± 2.29 µU/ml and the average level of free T4 was 1.16 ± 0.16 ng/ml. CONCLUSIONS: Prevalence subclinical hypothyroidism was 3.8%. especially in women with a mean age of 46. The incidence of cardiovascular risk factors in the subjects studied is higher in DM (13%), similar to general population in terms of dyslipidemia (40%) and obesity (23%) and lowest in hypertension (23%). In our study we observed a common pattern in the management of subclinical hypothyroidism, requiring the implementation and promotion of practice guidelines in primary care.


Asunto(s)
Enfermedades Cardiovasculares/complicaciones , Hipotiroidismo/complicaciones , Adulto , Factores de Edad , Anciano , Anciano de 80 o más Años , Enfermedades Cardiovasculares/epidemiología , Colesterol/sangre , Complicaciones de la Diabetes/epidemiología , Dislipidemias/epidemiología , Familia , Femenino , Humanos , Hipotiroidismo/epidemiología , Técnicas para Inmunoenzimas , Masculino , Persona de Mediana Edad , Obesidad/complicaciones , Obesidad/epidemiología , Sobrepeso/complicaciones , Sobrepeso/epidemiología , Estudios Retrospectivos , Factores de Riesgo , Factores Sexuales , Tirotropina/sangre , Tiroxina/sangre , Resultado del Tratamiento
15.
Eur J Med Chem ; 45(5): 1982-90, 2010 May.
Artículo en Inglés | MEDLINE | ID: mdl-20153564

RESUMEN

Novel nanostructured TiO2 and SiO2 based biocatalysts, with 3-4 wt. % of Pt have been developed. The obtained materials exhibit a high surface area together with a broad pore size distribution. The method of synthesis allowed obtaining high dispersed platinum metal nanoparticles. In vitro DNA reactivity test of the biocatalysts were carried out by electrophoresis and formation of DNA adducts was observed. The most active biocatalyst was H2PtCl6/SiO2. These biocatalysts were also tested in an experimental model of C6 brain tumours in Wistar rats. Administration of the material was made by stereotactic brain surgery to place it directly in the malignant tissue. A significant decrease in tumour size and weight as well as morphologic changes in cancer cells were observed.


Asunto(s)
Neoplasias Encefálicas/tratamiento farmacológico , ADN/efectos de los fármacos , Modelos Animales de Enfermedad , Nanopartículas del Metal/uso terapéutico , Nanomedicina , Neoplasias Experimentales/tratamiento farmacológico , Platino (Metal)/farmacología , Animales , Apoptosis/efectos de los fármacos , Biocatálisis , Neoplasias Encefálicas/patología , Neoplasias Encefálicas/cirugía , Proliferación Celular/efectos de los fármacos , ADN/química , ADN/metabolismo , Ensayos de Selección de Medicamentos Antitumorales , Masculino , Nanopartículas del Metal/química , Neoplasias Experimentales/patología , Neoplasias Experimentales/cirugía , Tamaño de la Partícula , Platino (Metal)/química , Ratas , Ratas Wistar , Propiedades de Superficie
16.
An Acad Bras Cienc ; 80(3): 427-32, 2008 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-18797795

RESUMEN

To find out natural antimicrobial agents as alternative in therapeutics and to preserve food, the methanol extract of Solanum palinacanthum aerial parts was submitted to purification steps guided by antibacterial and antifungal assays. As a consequence, the flavonoid rutin and 3,5-dicaffeoylquinic acid were isolated by column chromatography and high performance liquid chromatography, and identified by mass and nuclear magnetic resonance spectrometry. Minimal inhibitory concentrations (MIC) of the quinic acid derivative against Aeromonas hydrophila, Bacillus subtilis, Staphylococcus aureus and the fungus Aspergillus ochraceus were 250, 1000, 1000 and > 568 microg/mL, respectively. Against the same microorganisms, MIC for rutin were 1000, > 1000, > 1000 and 35 microg/mL, respectively. Rutin was very promising for A. ochraceus control, since its MIC against such fungus was close to the one observed for benzalkonium chloride, which is used as a fungicide in Brazil.


Asunto(s)
Antibacterianos/aislamiento & purificación , Antifúngicos/aislamiento & purificación , Solanum/química , Antibacterianos/farmacología , Antifúngicos/farmacología , Aspergillus ochraceus/efectos de los fármacos , Cromatografía , Bacterias Gramnegativas/efectos de los fármacos , Bacterias Grampositivas/efectos de los fármacos , Espectroscopía de Resonancia Magnética , Espectrometría de Masas , Pruebas de Sensibilidad Microbiana , Extractos Vegetales/farmacología
17.
An. acad. bras. ciênc ; 80(3): 427-432, Sept. 2008. ilus, tab
Artículo en Inglés | LILACS | ID: lil-491823

RESUMEN

To find out natural antimicrobial agents as alternative in therapeutics and to preserve food, the methanol extract of Solanum palinacanthum aerial parts was submitted to purification steps guided by antibacterial and antifungal assays. As a consequence, the flavonoid rutin and 3,5-dicaffeoylquinic acid were isolated by column chromatographyand high performance liquid chromatography, and identified by mass and nuclear magnetic resonance spectrometry. Minimal inhibitory concentrations (MIC) of the quinic acid derivative against Aeromonas hydrophila, Bacillus subtilis, Staphylococcus aureus and the fungus Aspergillus ochraceus were 250, 1000, 1000 and > 568µg/mL, respectively. Against the same microorganisms, MIC for rutin were 1000, > 1000, > 1000 and 35µg/mL, respectively. Rutinwas very promising for A. ochraceus control, since its MIC against such fungus was close to the one observed for benzalkonium chloride, which is used as a fungicide in Brazil.


Com vistas a descobrir antimicrobianos de origem natural para uso terapêutico ou para a preservação de alimentos, o extrato metanólico das partes aéreas de Solanum palinacanthum foi submetido a fracionamentos direcionados por testes para avaliar a atividade antibacteriana e antifúngica. Em decorrência, o flavonóide rutina e o ácido 3,5-dicafeoilquínico foram isolados por cromatografia em coluna e por cromatografia líquida de alta eficiência, para serem identificados por espectrometria de massas e de ressonância magnética nuclear. As concentrações inibitórias mínimas (CIM) do derivado do ácido cafeico contra Aeromonas hydrophila, Bacillus subtilis, Staphylococcus aureus e o fungo Aspergillus ochraceus foram 250, 1000, 1000 e > 568µg/mL, respectivamente. Contra os mesmos organismos, os valores de CIM para a rutina foram 1000, > 1000, > 1000 e 35µg/mL, respectivamente. A rutina mostrou-se muito promissora para o controle de A. ochraceus, pois seu valor de CIM contra tal fungo foi bem próximo ao observado para o cloreto de benzalcônio, que é empregado como fungicida no Brasil.


Asunto(s)
Antibacterianos/aislamiento & purificación , Antifúngicos/aislamiento & purificación , Solanum/química , Antibacterianos/farmacología , Antifúngicos/farmacología , Aspergillus ochraceus/efectos de los fármacos , Cromatografía , Bacterias Gramnegativas/efectos de los fármacos , Bacterias Grampositivas/efectos de los fármacos , Espectroscopía de Resonancia Magnética , Espectrometría de Masas , Pruebas de Sensibilidad Microbiana , Extractos Vegetales/farmacología
18.
Rev Esp Enferm Dig ; 99(4): 190-200, 2007 Apr.
Artículo en Español | MEDLINE | ID: mdl-17590100

RESUMEN

OBJECTIVE: to assess the relationship between different colorectal cancer risk factors in Albacete province. MATERIAL AND METHOD: the incidence and prevalence of CC (colorectal cancer) in Albacete province during the years from 1992 to 1999 were calculated using data from the Surgery and Anatomical Pathology Departments of hospitals located in the province, both public ("Complejo Hospitalario Universitario de Albacete" and "Hospital Comarcal de Hellín") and private ("Recoletas", "Sanatorios del Rosario" and "Santa Cristina"), and the provincial archives of the National Cancer Registry. Subsequently, the same calculation was made for each of the 33 Health Areas into which the province is organized. The three Health Areas with the highest incidence, and the three with the lowest incidence, of CC were selected for the study. By means of a systematic randomization of persons over 50 years, 445 persons were selected for the study using the census of the 25 villages and towns located in the high and low CC incidence areas. Subsequently we carried out the survey in these two zones: high and low incidence areas. Data were collected in Dbase IV, and the statistical analysis was carried out with the statistical package SPSS 10.1 for Windows. RESULTS: during the period studied 531 new cases of CC were registered, of which 291 (54.99%) were men. Mean rate was 15.9 per 100,000 persons/year. Highest incidence areas included Elche de la Sierra (30.2 per 100,000 persons/year), followed by Alcadozo (28.3), and Ontur (26.9). Lowest incidence areas were Ossa de Montiel (5.9), Munera (5.1), and Balazote (6.5). Out of 450 participants 414 (92%) filled out the questionnaire correctly. Variables including some kind of alcohol use (beer, wine, and coffee with brandy) are significantly associated with CC and multiply by more than one the risk for this disease. Some qualitative variables with statistically significant association increase, while some decrease, the risk of CC. For example, associated pathologies multiplies the risk of CC by 0.6, physical exercise by 0.3, moderate intake of alcohol by 0.5, olive oil intake by 0.7, and water intake by 0.3. Furthermore, a high intake of alcohol multiplies the risk of CC by 1.8, eggs and omelette by 2.95, pasta and rice by 2.15, blue fish by 1.8, meat and cold meats by 1.6, and having a first- or second-degree relative with cancer by 3. CONCLUSIONS: there is a significant relationship between colorectal cancer and familial cancer, physical activity, and the ingestion of alcohol, water, pasta, rice, and eggs.


Asunto(s)
Neoplasias Colorrectales/epidemiología , Neoplasias Colorrectales/etiología , Dieta , Estilo de Vida , Anciano , Estudios Transversales , Femenino , Humanos , Masculino , Persona de Mediana Edad , Factores de Riesgo
19.
Rev. esp. enferm. dig ; 99(4): 190-200, abr. 2007. ilus, tab
Artículo en Es | IBECS | ID: ibc-056556

RESUMEN

Objetivo: conocer el patrón de consumo alimentario y de estilo de vida de la población de estudio y evaluar la relación de los componentes de este patrón con el CCR. Material y método: se trata de un estudio observacional, descriptivo y analítico, de sección transversal. Utilizando los archivos de los Servicios de Cirugía y Anatomía Patológica del Complejo Hospitalario Universitario de Albacete y del Hospital Comarcal de Hellín, así como de las clínicas privadas de nuestra provincia (Recoletas, Sanatorios del Rosario y de Santa Cristina) y el Registro de Cáncer de la Delegación Provincial de Sanidad de Albacete, se determinó la incidencia y prevalencia del CCR en la provincia de Albacete durante los años 1992 a 1999 y posteriormente se fueron describiendo estas en las 33 zonas de salud que conforman la provincia. Se seleccionaron las tres zonas básicas de salud con más alta incidencia de CCR y las tres con más baja incidencia del CCR de la provincia de Albacete, así como los 25 censos de las poblaciones que pertenecían a estas dos zonas de alta y baja incidencia. Mediante muestreo aleatorio sistemático entre la población de 50 años o más 445 personas fueron seleccionadas para ser incluidas en el estudio. Posteriormente se realiza la encuesta en las dos zonas: alta y baja incidencia. Se recogen los datos en una base de datos estadística Dbase IV y se analizan con se paquete SPSS .10.1 Resultados: durante el periodo de estudio han aparecido en nuestra área 531 casos de CCR, de los que 291 (54,99%) eran hombres, con una tasa media de 15,9 por 100.000 hab./año. Los resultados seleccionaron como zonas de mayor incidencia a Elche de la Sierra con una tasa de 30,2 por 100.000 hab./año, seguida de Alcadozo con 28,3 por 100.000 hab./año y Ontur con 26,9 por 100.000 hab./año. Mientras que las zonas de menor incidencia son Ossa de Montiel con un 5,9 y en Munera con 5,1 por 100.000 hab./año. Balazote con 6,5 por 100.000 hab./año también forma parte del grupo de baja incidencia. De las 450 personas seleccionadas, completaron correctamente la encuesta 414 personas, el 92%. Dentro de las variables podemos ver que las que consumen algún tipo de alcohol: cerveza, vino y carajillos tienen una asociación estadísticamente significativa y multiplican por algo más de 1 el riesgo de padecer CCR. En las variables cualitativas podemos observar que dentro de las que tienen asociación estadísticamente significativa, existen unas que disminuyen el riesgo de padecer CCR y otras que lo aumentan. Así podemos ver que disminuye el riesgo de CCR la presencia de patologías asociadas que lo multiplicaría por 0,6, el hacer ejercicio multiplicaría el riesgo de CCR por 0,3, el consumo medio de alcohol lo multiplicaría por 0,5, el consumo de aceite de oliva lo multiplicaría por 0,7 y por último el consumo de agua lo haría por 0,3. Por otra parte aumenta el riesgo de padecer CCR el consumo alto de alcohol que lo multiplicaría por 1,8, el consumo de huevos y tortillas lo multiplicaría por 2,95, el consumo de pasta y arroz por 2,15, el consumo de pescado azul por 1,8, el consumo de embutidos y de carnes por 1,6 y finalmente el tener familiares de primer y segundo grado multiplicaría casi por 3 el riesgo de padecer CCR. Conclusiones: en nuestro estudio resultan factores protectores de CCR: tener alguna enfermedad, hacer ejercicio físico, consumo moderado de alcohol, consumo de aceite de oliva e ingestión de agua. Mientras que actúan como factores predisponentes el consumo alto de alcohol, consumo de huevos y tortillas, consumo de pasta y arroz, consumo de pescado azul, consumo de embutidos y carnes y tener familiares con cáncer


Objective: to assess the relationship between different colorectal cancer risk factors in Albacete province. Material and method: the incidence and prevalence of CC (colorectal cancer) in Albacete province during the years from 1992 to 1999 were calculated using data from the Surgery and Anatomical Pathology Departments of hospitals located in the province, both public (“Complejo Hospitalario Universitario de Albacete” and “Hospital Comarcal de Hellín”) and private (“Recoletas”, “Sanatorios del Rosario” and “Santa Cristina”), and the provincial archives of the National Cancer Registry. Subsequently, the same calculation was made for each of the 33 Health Areas into which the province is organized. The three Health Areas with the highest incidence, and the three with the lowest incidence, of CC were selected for the study. By means of a systematic randomization of persons over 50 years, 445 persons were selected for the study using the census of the 25 villages and towns located in the high and low CC incidence areas. Subsequently we carried out the survey in these two zones: high and low incidence areas. Data were collected in Dbase IV, and the statistical analysis was carried out with the statistical package SPSS 10.1 for Windows. Results: during the period studied 531 new cases of CC were registered, of which 291 (54.99%) were men. Mean rate was 15.9 per 100,000 persons/year. Highest incidence areas included Elche de la Sierra (30.2 per 100,000 persons/year), followed by Alcadozo (28.3), and Ontur (26.9). Lowest incidence areas were Ossa de Montiel (5.9), Munera (5.1), and Balazote (6.5). Out of 450 participants 414 (92%) filled out the questionnaire correctly. Variables including some kind of alcohol use (beer, wine, and coffee with brandy) are significantly associated with CC and multiply by more than one the risk for this disease. Some qualitative variables with statistically significant association increase, while some decrease, the risk of CC. For example, associated pathologies multiplies the risk of CC by 0.6, physical exercise by 0.3, moderate intake of alcohol by 0.5, olive oil intake by 0.7, and water intake by 0.3. Furthermore, a high intake of alcohol multiplies the risk of CC by 1.8, eggs and omelette by 2.95, pasta and rice by 2.15, blue fish by 1.8, meat and cold meats by 1.6, and having a first- or second-degree relative with cancer by 3. Conclusions: there is a significant relationship between colorectal cancer and familial cancer, physical activity, and the ingestion of alcohol, water, pasta, rice, and eggs


Asunto(s)
Humanos , Conducta Alimentaria , Neoplasias Colorrectales/epidemiología , Estilo de Vida , Factores de Riesgo , Ingestión de Líquidos , Ejercicio Físico , Estudios Epidemiológicos
20.
Rev Esp Enferm Dig ; 98(6): 449-59, 2006 Jun.
Artículo en Inglés, Español | MEDLINE | ID: mdl-16948544

RESUMEN

OBJECTIVE: To Determine the incidence of constipation in Albacete province and its relation with diet and lifestyle. PATIENTS AND METHODS: Cross-sectional population survey. We studied 414 participants over 50 years of age in Albacete province. 445 persons over 50 years of age were included in the study. All participants were selected by systematic random sampling; 414 participants filled in the questionnaire correctly. MAIN MEASURES: age, weight and height, marital status, level of education and occupation; presence of a disease, number of sleep hours a day, physical exercise, smoking, alcohol intake, drug intake (anti-inflammatories and laxatives); bowel habit, diet, meal frequency and place; food intake frequency per week, daily intake of water, coffee, tea and herbal beverages; vitamin and fiber supplements; presence of cancer in the family. RESULTS: 56.9% of participants were women. Mean age 67.07 years. In Albacete province, 4.4% of the population over 50 years have a bowel habit consistent with constipation. Most participants had three meals a day (breakfast, lunch, and supper), while 50% had another meal in the morning or afternoon. These meals took place, habitually, in the domicile. There was a preponderance in daily intake of the following foods: milk (83.7%), bread (95.1%), vegetables (68.8%), fruit (91.8%), and virgin olive oil (96.6%). Fish was eaten every one to two days, and pulses and meat every three to six days. 44.4% of participants drank one to two liters of water a day. Only 3.9% of participants took some supplement; 35% of participants were on a diet. It was observed that 97.7% of participants with more than three defecations a week had a high intake of virgin olive oil; 65.7% of participants did some physical exercise customarily; 70.2% of participants were non-smokers, 10.2% were smokers, and 18.4% were ex-smokers. With regard to alcohol, the percentage of drinkers was 35.1%. The main class of medications taken by participants was NSAIDs - 14.5%; 79.7% took neither NSAIDs nor laxatives. Only 2.7% of participants took laxatives regularly. CONCLUSIONS: Most participants had relatively healthy eating habits.


Asunto(s)
Estreñimiento/epidemiología , Anciano , Estudios Transversales , Dieta , Conducta Alimentaria , Femenino , Humanos , Estilo de Vida , Masculino , Persona de Mediana Edad , Factores Sexuales , Factores Socioeconómicos , España/epidemiología
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA