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1.
Cytotherapy ; 26(1): 25-35, 2024 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-37897472

RESUMEN

BACKGROUND AIMS: There are currently no effective anti-viral treatments for coronavirus disease 2019 (COVID-19)-hospitalized patients with hypoxemia. Lymphopenia is a biomarker of disease severity usually present in patients who are hospitalized. Approaches to increasing lymphocytes exerting an anti-viral effect must be considered to treat these patients. Following our phase 1 study, we performed a phase 2 randomized multicenter clinical trial in which we evaluated the efficacy of the infusion of allogeneic off-the-shelf CD45RA- memory T cells containing severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-specific T cells from convalescent donors plus the standard of care (SoC) versus just the SoC treatment. METHODS: Eighty-four patients were enrolled in three Spanish centers. The patients were randomized into the infusion of 1 × 106/kg CD45RA- memory T cells or the SoC. We selected four unvaccinated donors based on the expression of interferon gamma SARS-CoV-2-specific response within the CD45RA- memory T cells and the most frequent human leukocyte antigen typing in the Spanish population. RESULTS: We analyzed data from 81 patients. The primary outcome for recovery, defined as the proportion of participants in each group with normalization of fever, oxygen saturation sustained for at least 24 hours and lymphopenia recovery through day 14 or at discharge, was met for the experimental arm. We also observed faster lymphocyte recovery in the experimental group. We did not observe any treatment-related adverse events. CONCLUSIONS: Adoptive cell therapy with off-the-shelf CD45RA- memory T cells containing SAR-CoV-2-specific T cells is safe, effective and accelerates lymphocyte recovery of patients with COVID-19 pneumonia and/or lymphopenia. TRIAL REGISTRATION: NCT04578210.


Asunto(s)
COVID-19 , Linfopenia , Humanos , SARS-CoV-2 , COVID-19/terapia , Células T de Memoria , Resultado del Tratamiento , Linfopenia/terapia , Antivirales
2.
Int Microbiol ; 2023 Nov 23.
Artículo en Inglés | MEDLINE | ID: mdl-37995017

RESUMEN

This study aimed to analyze Escherichia coli from marketed meat samples in Peru. Sixty-six E. coli isolates were recovered from 21 meat samples (14 chicken, 7 beef), and antimicrobial resistance levels and the presence of mechanisms of antibiotic resistance, as well as clonal relationships and phylogeny of colistin-resistant isolates, were established. High levels of antimicrobial resistance were detected, with 93.9% of isolates being multi-drug resistant (MDR) and 76.2% of samples possessing colistin-resistant E. coli; of these, 6 samples from 6 chicken samples presenting mcr-1-producer E. coli. Colistin-resistant isolates were classified into 22 clonal groups, while phylogroup A (15 isolates) was the most common. Extended-spectrum ß-lactamase- and pAmpC-producing E. coli were found in 18 and 8 samples respectively, with blaCTX-M-55 (28 isolates; 16 samples) and blaCIT (8 isolates; 7 samples) being the most common of each type. Additionally, blaCTX-M-15, blaCTX-M-65, blaSHV-27, blaOXA-5/10-like, blaDHA, blaEBC and narrow-spectrum blaTEM were detected. In addition, 5 blaCTX-M remained unidentified, and no sought ESBL-encoding gene was detected in other 6 ESBL-producer isolates. The tetA, tetE and tetX genes were found in tigecycline-resistant isolates. This study highlights the presence of MDR E. coli in Peruvian food-chain. The high relevance of CTX-M-55, the dissemination through the food-chain of pAmpC, as well as the high frequency of unrelated colistin-resistant isolates is reported.

3.
Trials ; 23(1): 784, 2022 Sep 15.
Artículo en Inglés | MEDLINE | ID: mdl-36109825

RESUMEN

BACKGROUND: Corticosteroids are one of the few drugs that have shown a reduction in mortality in coronavirus disease 2019 (COVID-19). In the RECOVERY trial, the use of dexamethasone reduced 28-day mortality compared to standard care in hospitalized patients with suspected or confirmed COVID-19 requiring supplemental oxygen or invasive mechanical ventilation. Evidence has shown that 30% of COVID-19 patients with mild symptoms at presentation will progress to acute respiratory distress syndrome (ARDS), particularly patients in whom laboratory inflammatory biomarkers associated with COVID-19 disease progression are detected. We postulated that dexamethasone treatment in hospitalized patients with COVID-19 pneumonia without additional oxygen requirements and at risk of progressing to severe disease might lead to a decrease in the development of ARDS and thereby reduce death. METHODS/DESIGN: This is a multicenter, randomized, controlled, parallel, open-label trial testing dexamethasone in 252 adult patients with COVID-19 pneumonia who do not require supplementary oxygen on admission but are at risk factors for the development of ARDS. Risk for the development of ARDS is defined as levels of lactate dehydrogenase > 245 U/L, C-reactive protein > 100 mg/L, and lymphocyte count of < 0.80 × 109/L. Eligible patients will be randomly assigned to receive either dexamethasone or standard of care. Patients in the dexamethasone group will receive a dose of 6 mg once daily during 7 days. The primary outcome is a composite of the development of moderate or more severe ARDS and all-cause mortality during the 30-day period following enrolment. DISCUSSION: If our hypothesis is correct, the results of this study will provide additional insights into the management and progression of this specific subpopulation of patients with COVID-19 pneumonia without additional oxygen requirements and at risk of progressing to severe disease. TRIAL REGISTRATION: ClinicalTrials.gov NCT04836780. Registered on 8 April 2021 as EARLY-DEX COVID-19.


Asunto(s)
Tratamiento Farmacológico de COVID-19 , COVID-19 , Dexametasona , Neumonía , Corticoesteroides/efectos adversos , Adulto , Proteína C-Reactiva , COVID-19/complicaciones , Dexametasona/efectos adversos , Humanos , Lactato Deshidrogenasas , Estudios Multicéntricos como Asunto , Oxígeno , Neumonía/tratamiento farmacológico , Ensayos Clínicos Controlados Aleatorios como Asunto , Síndrome de Dificultad Respiratoria/epidemiología , Insuficiencia Respiratoria/epidemiología
4.
J Physiol Biochem ; 77(4): 531-538, 2021 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-33909240

RESUMEN

This study aimed to determine in lactating rats how fatty acid profiles are affected by litter size. On day 2 after parturition, litters of lactating rats were adjusted to a normal litter size of 9 pups/dam (NL) or to a small litter of 4 pups/dam (SL), and dams were studied at day 21 of lactation. Plasma glucose, insulin, and docosahexaenoic acid (DHA) concentrations were higher in SL than in NL dams, whereas the concentrations of most other fatty acids, triacylglycerols (TAG), and non-esterified fatty acids were lower in the SL dams. In the liver, the concentration of TAG was lower in SL than in NL dams as was the concentration of most fatty acids, with the exception of stearic acid (STA), arachidonic acid (ARA), and DHA concentrations that were higher in SL. Both plasma and liver Δ9 desaturase indices were lower in SL than in NL dams, whereas both Δ5 and Δ6 desaturase indices were higher in SL dams. In the liver, the expression of acetyl CoA carboxylase was lower in SL than in NL dams, and among the different adipose tissue depots, only mesenteric adipose tissue showed a higher concentration of most fatty acids in SL than in NL dams. It is proposed that reduction of litter size during lactation decreases liver lipogenesis de novo, although the synthesis of long-chain polyunsaturated fatty acids from their corresponding precursors increases, and lipolytic activity in mesenteric adipose tissue decreases probably as result of increased insulin responsiveness.


Asunto(s)
Ácidos Grasos , Lactancia , Tejido Adiposo , Animales , Femenino , Tamaño de la Camada , Embarazo , Ratas , Triglicéridos
5.
Multimed (Granma) ; 24(6): 1349-1365, nov.-dic. 2020. tab
Artículo en Español | LILACS-Express | LILACS | ID: biblio-1143336

RESUMEN

RESUMEN El aborto espontáneo es uno de los más frecuentes de su tipo, con el objetivo de determinar algunos aspectos epidemiológicos del aborto espontáneo y disminuir su incidencia se realizó el presente estudio. A través del método observacional, transversal, descriptivo y prospectivo; se investigaron pacientes atendidas en el Hospital Fe del Valle en el primer semestre del 2019. La muestra estuvo conformada por 109 pacientes con aborto espontáneo, de un universo de 342 remitidas por esta causa. Entre los resultados, se identificó que la edad media es de 27 años. De 88 gestantes, con parto anterior, 40.84% fueron eutócicos, de 111 con abortos anteriores 29.74% fueron espontáneos. La manifestación clínica más frecuente fue el sangrado transvaginal (79.81%). La mayoría de los abortos espontáneos ocurrieron en el primer trimestre del embarazo, la edad gestacional media al momento de ocurrencia del evento fue 9.3 semanas; los factores de riesgo más frecuentes fueron: consumo de café (62.39%), aborto previo (44.04%). El consumo de cafeína, el tabaquismo y el aborto espontáneo precoz son factores de riesgo frecuentes en las pacientes estudiadas.


ABSTRACT Spontaneous abortion is one of the most frequent of its kind. In order to determine some epidemiological aspects of spontaneous abortion and reduce its incidence, the present study was carried out. Through the observational, transversal, descriptive and prospective method; Patients treated at the Hospital Fe del Valle in the first half of 2019 were investigated. The sample consisted of 109 patients with spontaneous abortion, out of a universe of 342 referred for this cause. Among the results, it was identified that the mean age is 27 years. Of 88 pregnant women, with previous delivery, 40.84% ​​were eutocic, of 111 with previous abortions 29.74% were spontaneous. The most frequent clinical manifestation was transvaginal bleeding (79.81%). The majority of spontaneous abortions occurred in the first trimester of pregnancy, the mean gestational age at the time of occurrence of the event was 9.3 weeks; the most frequent risk factors were: coffee consumption (62.39%), previous abortion (44.04%). Caffeine consumption, smoking and early spontaneous abortion are frequent risk factors in the patients studied.


RESUMO O aborto espontâneo é um dos mais frequentes desse tipo e, com o objetivo de determinar alguns aspectos epidemiológicos do aborto espontâneo e reduzir sua incidência, foi realizado o presente estudo. Pelo método observacional, transversal, descritivo e prospectivo; Foram investigados pacientes atendidos no Hospital Fe del Valle no primeiro semestre de 2019. A amostra foi constituída por 109 pacientes com aborto espontâneo, de um universo de 342 encaminhados por essa causa. Dentre os resultados, identificou-se que a média de idade é de 27 anos. Das 88 gestantes, com parto anterior, 40,84% foram eutócicas, das 111 com abortos anteriores 29,74% foram espontâneos. A manifestação clínica mais frequente foi sangramento transvaginal (79,81%). A maioria dos abortos espontâneos ocorreu no primeiro trimestre da gravidez, a idade gestacional média no momento da ocorrência do evento era de 9,3 semanas; os fatores de risco mais frequentes foram: consumo de café (62,39%), aborto anterior (44,04%). O consumo de cafeína, tabagismo e aborto espontâneo precoce são fatores de risco frequentes nas pacientes estudadas.

6.
Mater Sci Eng C Mater Biol Appl ; 114: 111075, 2020 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-32993970

RESUMEN

Biological membranes are currently used in Ophthalmology in order to treat different ocular disorders. These membranes have different properties such as cellular biocompatibility and promoting wound healing. Moreover, intrinsic antimicrobial properties could also be desirable because it would allow their use reducing the risk of infections. Graphene and its derivatives are promising biomaterials that already proved their bactericidal effect. However, their clinical use is limited due to the controversial results regarding their toxicity. In this work, we have developed and characterized a reduced graphene oxide membrane (rGOM) for its use in ocular Regenerative Medicine, and studied its in vitro and in vivo biocompatibility and genotoxicity with different types of human ocular cells. We proved that rGOM allowed the growth of different ocular cells without inducing in vitro or in vivo cytotoxicity or genotoxicity in the short-term. These results indicate that rGOM may be a promising candidate in Regenerative Medicine for the treatment of different ocular pathologies.


Asunto(s)
Grafito , Materiales Biocompatibles/farmacología , Ojo , Humanos , Medicina Regenerativa
7.
Arch Gerontol Geriatr ; 91: 104204, 2020 Jul 27.
Artículo en Inglés | MEDLINE | ID: mdl-32771883

RESUMEN

INTRODUCTION: Older subjects have a higher risk of COVID-19 infection and a greater mortality. However, there is a lack of studies evaluating the characteristics of this infection at advanced age. PATIENTS AND METHODS: We studied 404 patients ≥ 75 years (mean age 85.2 ±â€¯5.3 years, 55 % males), with PCR-confirmed COVID-19 infection, attended in two hospitals in Madrid (Spain). Patients were followed-up until they were discharged from the hospital or until death. RESULTS: Symptoms started 2-7 days before admission, and consisted of fever (64 %), cough (59 %), and dyspnea (57 %). A total of 145 patients (35.9 %) died a median of 9 days after hospitalization. In logistic regression analysis, predictive factors of death were age (OR 1.086; 1.015-1.161 per year, p = 0.016), heart rate (1.040; 1.018-1.061 per beat, p < 0.0001), a decline in renal function during hospitalization (OR 7.270; 2.586-20.441, p < 0.0001) and worsening dyspnea during hospitalization (OR 73.616; 30.642-176.857, p < 0.0001). Factors predicting survival were a female sex (OR 0.271; 0.128-0.575, p = 0.001), previous treatment with RAAS inhibitors (OR 0.459; 0.222-0.949, p = 0.036), a higher oxygen saturation at admission (OR 0.901; 0.842-0.963 per percentage point increase, p = 0.002), and a greater platelet count (OR 0.995; 0.991-0.999 per 106/L, p = 0.025). CONCLUSION: Elderly patients with COVID-19 infection have a similar clinical course to younger individuals. Previous treatment with RAAS inhibitors, and demographic, clinical and laboratory data influence prognosis.

8.
Epigenetics ; 15(3): 283-293, 2020 03.
Artículo en Inglés | MEDLINE | ID: mdl-31512544

RESUMEN

The presence of nanomaterials in our everyday life is ever increasing, and so too are concerns about the possible health consequences of exposure to them. While evidence of their biological activity is growing, there is still scant knowledge of the epigenetic mechanisms that could be at play in these processes. Moreover, the great variability in the chemical and physical structures of these compounds handicaps the study of their possible health risks. Here we have synthesized reduced graphene oxide (rGO) through the thermal exfoliation/reduction of graphite oxide, and characterized the resulting material. We have then made use of Illumina's MethylationEPIC arrays and bisulphite pyrosequencing to analyse the genome-wide and global DNA methylation dynamics associated with the medium-term exposure of human lung epithelial cells to rGO at concentrations of 1 and 10 µg/mL. The results show no genome-wide or global DNA methylation changes associated with either condition. Our observations thus suggest that medium-term rGO exposure does not have significant effects on the DNA methylation patterns of human lung epithelial cells.


Asunto(s)
Células Epiteliales Alveolares/efectos de los fármacos , Metilación de ADN , Epigenoma , Grafito/toxicidad , Nanoestructuras/toxicidad , Células Epiteliales Alveolares/metabolismo , Células Cultivadas , Grafito/farmacología , Humanos
9.
Polymers (Basel) ; 11(3)2019 Mar 08.
Artículo en Inglés | MEDLINE | ID: mdl-30960433

RESUMEN

Multifunctional elastomer nanocomposites have been applied in several high-tech fields. The design of materials with tailored properties capable of tuning their performance is a topical challenge. Here, we demonstrate that it is possible to modulate the mechanical and transport properties of silicone rubber nanocomposites by controlling the structure, chemical composition and morphology of the graphene material. Intrinsic graphene properties, such as remaining oxygen groups, specific surface area, and aspect ratio, among others, have a profound effect on the final properties of the nanocomposite. Thus, the thermal conductivity benefits from larger filler size and high aromatic restoration. Whereas mechanical properties and electrical conductivity require a proper balance between filler/polymer matrix interaction and a partial aromatic restoration.

10.
Food Chem Toxicol ; 123: 546-552, 2019 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-30543894

RESUMEN

We studied in rats the effects of cafeteria diet (CD) supplemented (or not) with fish oil (FO) during just the first 12 days of pregnancy, or during the whole of pregnancy and lactation in 14-month old offspring. Female rats were given standard diet (STD) or CD and after mating some animals remained on STD or CD; for some CD rats the diet was supplemented with 8.78% FO. After 12 days, half of the CD-FO group returned to CD (CD-FO12) and the others remained on CD-FO. From weaning all offspring were given STD. The adiposity index of male offspring of CD dams increased but was normal in CD-FO males. Plasma triacylglycerols (TAG) and individual fatty acid concentrations were similar among the groups. Liver total lipids, TAG, fatty acid concentrations, Δ9-desaturase indices and the mRNA expression of fatty acid synthase were higher in male offspring of CD than in those of STD; most of these differences disappeared in male offspring of CD-FO12 and CD-FO dams. Female offspring showed smaller changes. Thus, a moderate supplement with FO during just the first half of gestation or during pregnancy and lactation in rats on CD decreases the liver steatosis in male adult offspring.


Asunto(s)
Dieta/efectos adversos , Suplementos Dietéticos/análisis , Hígado Graso/prevención & control , Aceites de Pescado/administración & dosificación , Efectos Tardíos de la Exposición Prenatal/prevención & control , Animales , Ácidos Grasos/sangre , Hígado Graso/sangre , Hígado Graso/etiología , Femenino , Humanos , Hígado/metabolismo , Masculino , Embarazo , Efectos Tardíos de la Exposición Prenatal/sangre , Efectos Tardíos de la Exposición Prenatal/etiología , Ratas , Ratas Sprague-Dawley , Factores Sexuales , Triglicéridos/sangre
11.
Medisur ; 14(6): 671-688, nov.-dic. 2016.
Artículo en Español | LILACS | ID: biblio-829241

RESUMEN

La elevada importancia que ha tenido el desarrollo y utilización adecuada de la radiología (actualmente imagenología) para el diagnóstico de diversas afecciones médicas en el presente siglo, especialmente en las últimas décadas, unida a la ausencia de investigaciones relacionadas con el surgimiento y evolución de dicha especialidad en nuestra localidad, sustenta la necesidad de brindar un mayor conocimiento de la historia de la Radiología en Cienfuegos. El objetivo de este estudio es exponer los elementos relacionados con el surgimiento y desarrollo de la Radiología en Cuba, particularmente en Cienfuegos, así como los beneficios que ha traído a la población de esta ciudad. Para ello se realizó un estudio cualitativo, de perfil histórico y descriptivo. Se exponen aspectos relacionados con la asistencia y la docencia del personal no médico y se hace alusión a diversas personalidades relevantes vinculadas a esta actividad. El surgimiento de la Radiología en la provincia se remonta a los primeros años de la segunda década del 1900, sin embargo, no fue hasta después del triunfo de la revolución en 1959, que experimentó un verdadero avance tecnológico.


The need of providing a better understanding of Radiology in Cienfuegos, is founded on the importance the development and the adequate use of Radiology (currently imaging) has had for the diagnosis of diverse medical conditions in the present century, specially in the last decades, so as the absence of research associated to the origin and evolution of this specialty in the locality. The objective of this paper is to present the elements related with the emergence and development of Radiology in Cuba, particularly in Cienfuegos, and the benefits it has brought about for the population of this city. Aimed at that, a qualitative study was carried out, with a historical and descriptive profile. Aspects related to non medical personnel assistance and teaching are presented and it is alluded to diverse relevant personalities linked to this activity. The emergence of Radiology in the province dates back to the early years of the second decade of 1900, however, it was not until after the triumph of the revolution in 1959, which experienced true technological advances.

12.
Eur J Nutr ; 55(4): 1741-53, 2016 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-26195235

RESUMEN

PURPOSE: The aim was to determine the effects of cafeteria diet (CD) and fish oil supplements given to pregnant and lactating rats on the birth weight and fatty acid profiles of their offspring. METHODS: Female rats were given standard diet (STD) or CD for 22 days before pregnancy. After mating, some animals remained on STD or CD; for some CD rats, the diet was supplemented with 8.78 % fish oil (CD-FO). After 12 days, half the CD-FO group returned to CD (CD-FO12) and the others remained on CD-FO. RESULTS: At birth, body weights of pups of the three CD groups were lower than STD, maintained until 21 days in the CD-FO group only. At the end of lactation, dams of the CD groups had increased plasma triacylglycerols (TAG), non-esterified fatty acids, and glycerol concentrations, whereas most n-6 long-chain polyunsaturated fatty acids (LCPUFA) were decreased, the effect being greatest in the CD-FO group, where most n-3 LCPUFA were increased and indices of Δ(5) and Δ(6) desaturase activities decreased. The 21-day-old pups of the CD group had increased plasma TAG, not present in the CD-FO group, which had increased 3-hydroxybutyrate concentrations. In both 2- and 21-day-old CD pups, plasma concentrations of ARA were lower than STD, and even lower in the two CD-FO groups. CONCLUSIONS: The effect of CD and CD-FO decreasing pups body weight could be related to decreased concentrations of ARA, caused by the inhibition of the Δ(5) and Δ(6) desaturases in the pathway of n-6 LCPUFA biosynthesis.


Asunto(s)
Peso Corporal/efectos de los fármacos , Dieta/veterinaria , Aceites de Pescado/farmacología , Lactancia/efectos de los fármacos , Ácido 3-Hidroxibutírico/sangre , Animales , Animales Recién Nacidos , Ácido Araquidónico/sangre , Peso al Nacer/efectos de los fármacos , Grasas de la Dieta/administración & dosificación , Suplementos Dietéticos , Ácidos Grasos Omega-3/sangre , Ácidos Grasos Omega-6/sangre , Femenino , Embarazo , Ratas , Ratas Sprague-Dawley , Triglicéridos/sangre
13.
Phys Chem Chem Phys ; 17(2): 1084-92, 2015 Jan 14.
Artículo en Inglés | MEDLINE | ID: mdl-25412831

RESUMEN

The proliferation of novel types and designs of electrochemical capacitors makes it necessary to obtain a better understanding of the behavior of these systems together with a more systematic classification of them. In this study a rational classification of supercapacitors based on the charge storage mechanism and the active material of each electrode is proposed. The internationally accepted terminology - the terms symmetric, asymmetric and hybrid - is also clarified in an attempt to standardize the current definitions and facilitate the systematic classification of each device. Additionally, the selection of suitable mathematical expressions to calculate the capacitance of each kind of system is rationalized throughout the discussion taking into account the behavioral characteristics of each electrode. An examination of the potential evolution profile of each electrode during the galvanostatic cycling of the supercapacitor is presented as a key tool for understanding the fundamental behavior of these devices.

14.
J Colloid Interface Sci ; 428: 36-40, 2014 Aug 15.
Artículo en Inglés | MEDLINE | ID: mdl-24910032

RESUMEN

Enhanced SO2 adsorption of activated carbon fibers is obtained by tailoring a specific micro-mesoporous structure in the fibers. This architecture is obtained via metal catalytic activation of the fibers with a novel precursor, cobalt naphthenate, which contrary to other precursors, also enhances spinnability and carbon fiber yield. In the SO2 oxidation, it is demonstrated that the combination of micropores and large mesopores is the main factor for an enhanced catalytic activity which is superior to that observed in other similar microporous activated carbon fibers. This provides an alternative way for the development of a new generation of catalytic material.

15.
ChemSusChem ; 7(3): 914-8, 2014 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-24520000

RESUMEN

A graphite felt decorated with bismuth nanoparticles was studied as negative electrode in a vanadium redox flow battery (VRFB). The results confirm the excellent electrochemical performance of the bismuth modified electrode in terms of the reversibility of the V(3+) /V(2+) redox reactions and its long-term cycling performance. Moreover a mechanism that explains the role that Bi nanoparticles play in the redox reactions in this negative half-cell is proposed. Bi nanoparticles favor the formation of BiHx , an intermediate that reduces V(3+) to V(2+) and, therefore, inhibits the competitive irreversible reaction of hydrogen formation (responsible for the commonly observed loss of Coulombic efficiency of VRFBs). Thus, the total charge consumed during the cathodic sweep in this electrode is used to reduce V(3+) to V(2+) , resulting in a highly reversible and efficient process.


Asunto(s)
Bismuto/química , Suministros de Energía Eléctrica , Grafito/química , Nanopartículas del Metal/química , Vanadio/química , Electroquímica , Electrodos , Oxidación-Reducción , Textiles
16.
Lipids ; 49(3): 265-73, 2014 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-24449164

RESUMEN

Dietary trans-fatty acids (t-FA) during pregnancy have adverse effects on growth and development. To determine the effect of dietary t-FA during just the first half of pregnancy, rats were given a diet containing 8 % hydrogenated peanut oil and 2 % olive oil (PO) and compared to rats given a diet containing 10 % olive oil (OO). After 12 days all rats were fed standard diet and were studied at days 12 or 20 of pregnancy or days 1 or 6 postpartum. At day 12 of pregnancy there were small differences in the plasma and lumbar adipose tissue fatty acid profiles and elaidic acid [18:1(n-9)t] was present in the PO group. From day 12 to 20 of pregnancy, plasma non-esterified fatty acids, glycerol, triacylglycerols (TAG) and most individual fatty acids increased more in PO than in OO. At day 20 of pregnancy in the PO group most plasma elaidic acid appeared as plasma TAG and was also present in the mammary gland, to decline in both sites at day 1 postpartum. Elaidic acid concentration was low in the plasma of 20-day fetuses, increased in 1-day newborns declining at day 6. Thus t-FA, eaten during early pregnancy, accumulated in maternal adipose tissue and were released during late pregnancy to be taken up by the mammary gland becoming available to the newborns during suckling.


Asunto(s)
Exposición Materna , Ácidos Grasos trans/administración & dosificación , Animales , Animales Lactantes , Femenino , Embarazo , Ratas , Ratas Sprague-Dawley
17.
Chem Rev ; 114(3): 1608-36, 2014 Feb 12.
Artículo en Inglés | MEDLINE | ID: mdl-24080106
18.
Gac Sanit ; 26(6): 519-24, 2012.
Artículo en Español | MEDLINE | ID: mdl-22483409

RESUMEN

OBJECTIVE: To describe sexual behavior and activity among adolescents aged 12-17 years old in Andalusia (Spain) in 2007-2008. METHOD: The data for this study were collected through an anonymous questionnaire distributed to a stratified random sample of 2,225 secondary school students in Andalusia. Participation was voluntary. RESULTS: A total of 388 respondents (18.2%) reported having had complete sexual intercourse, with no statistically significant differences between boys (18.0%) and girls (18.5%). However, boys initiated the following practices earlier than girls: sexual activity (14 years versus 14.4 years), masturbation (11.3 years versus 12.7 years), oral sex (13.8 years versus 14.6 years) and mutual masturbation (13.7 years versus 14.4 years). Other gender differences included the number of sexual partners (two in boys versus 1.6 in girls), recent sexual activity (higher in girls), internet sex (higher in boys), contraceptive use during the first coitus (lower in boys) and knowledge about double-barrier methods of contraception and sexually transmitted diseases (higher in girls). CONCLUSIONS: One out of six Andalusian secondary education students had had sexual intercourse. Two-thirds of the students were sexually active, especially girls, with limited knowledge of double-barrier methods and sexually transmitted diseases. The results of this study demonstrate the importance of including sex education as a core subject in the secondary education curriculum.


Asunto(s)
Conducta del Adolescente , Conducta Sexual/estadística & datos numéricos , Adolescente , Niño , Conducta Infantil , Conducta Anticonceptiva/estadística & datos numéricos , Femenino , Conocimientos, Actitudes y Práctica en Salud , Necesidades y Demandas de Servicios de Salud , Humanos , Internet , Masculino , Embarazo , Muestreo , Educación Sexual , Parejas Sexuales , Enfermedades de Transmisión Sexual/epidemiología , Enfermedades de Transmisión Sexual/prevención & control , España , Encuestas y Cuestionarios
19.
J Hazard Mater ; 192(3): 1525-32, 2011 Sep 15.
Artículo en Inglés | MEDLINE | ID: mdl-21782335

RESUMEN

A coal-tar-derived mesophase was chemically activated to produce a high surface area (~3200 m(2)/g) carbon with a porosity made up of both micropores and mesopores. Its adsorption capacities were found to be among the highest ever reported in literature, reaching values of 860 mg/g and 1200 mg/g for the adsorption of benzene and toluene, respectively, and 1200 mg/g for the combined adsorption of benzene and toluene from an industrial wastewater. Such high values imply that the entire pore system, including the mesopore fraction, is involved in the adsorption process. The almost complete pore filling is thought to be due to the high relative concentrations of the tested solutions, resulting from the low saturation concentration values for benzene and toluene, which were obtained by fitting the adsorption data to the BET equation in liquid phase. The kinetics of adsorption in the batch experiments which were conducted in a syringe-like adsorption chamber was observed to proceed in accordance with the pseudo-second order kinetic model. The combined presence of micropores and mesopores in the material is thought to be the key to the high kinetic performance, which was outstanding in a comparison with other porous materials reported in the literature.


Asunto(s)
Benceno/química , Carbono/química , Tolueno/química , Contaminantes Químicos del Agua/análisis , Purificación del Agua/métodos , Adsorción , Técnicas de Química Analítica , Diseño de Equipo , Residuos Industriales , Cinética , Porosidad , Soluciones
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