Papers by LIZBETH BEATRIZ GONZALEZ LOPEZ
Superficies y vacío, 1999
Ferroelectric Ba 1-x Sr x TiO 3 thin films were deposited by pulsed laser ablation on SiO 2 /Si, ... more Ferroelectric Ba 1-x Sr x TiO 3 thin films were deposited by pulsed laser ablation on SiO 2 /Si, RuO 2 /Ta/SiO 2 /Si and Pt/Ti/SiO 2 /Si substrates. The films were weakly crystalline in the as-deposited condition and subsequent crystallization was induced by annealing the films in the range of 550-650ºC. The BST films deposited on Pt/Ti/SiO 2 /c-Si substrates presented wide cracks that were promoted during the annealing process due to the thermal expansion mismatch between the BST films (α BST = 4 x 10 -6 ºC -1 ) and the Pt (α Pt = 9 x 10 -6 ºC -1 ). Smooth films showing slightly crackeded areas were obtained on SiO 2 /c-Si and RuO 2 /Ta/SiO 2 /Si substrates. The ruthenium oxide thermal expansion coefficient is α RuO2 = 5.2 x 10 -6 ºC -1 . A cross-sectional analysis at the ferroelectric/substrate interface showed that for the lower annealing temperature (550ºC) a mixed amorphous/nanocrystalline microstructure is formed. For temperatures above 600ºC a randomly oriented polycrystalline material is obtained. However, an amorphous layer of 4-6 nm still remains on the substrate even after heat-treatments up to 650ºC. The dielectric constant of the BST films varied in the range of 30-325.
PubMed, Nov 1, 1994
This paper discusses recent trends concerning the commercialization of pesticides in Mexico and f... more This paper discusses recent trends concerning the commercialization of pesticides in Mexico and focuses on organophosphates and their potential health risk impact. It points out the existing lack of knowledge on health effects associated to chronic exposure to organophosphate pesticides. A need for both toxicological and epidemiologic studies of chronic exposure is identified. Regulatory programs for pesticides in Mexico and the United States are also compared. The paper also addresses the possibility of effective enforcement of environmental and health regulations in Mexico as a result of more rigorous surveillance under NAFTA.
![Research paper thumbnail of [Reproductive risk factors and uterine cervix cancer in Mexico City]](https://a.academia-assets.com/images/blank-paper.jpg)
[Reproductive risk factors and uterine cervix cancer in Mexico City]
PubMed, 1993
An epidemiological case control study nested in the Early Cancer Detection program of the Health ... more An epidemiological case control study nested in the Early Cancer Detection program of the Health Ministry in Mexico City was carried out to evaluate the principal reproductive risk factors associated with uterine cervix cancer. Information from 12,741 gynecological cytologies reported to the National Cancer Registry, during the period between January 2 to March 31, 1987 was studied. In this population group the most important reproductive risk factors associated with uterine cervix cancer were: multiple births (seven or more births, OR = 3.24, IC 95% = 2.20-4.76), initiation of active sex life before 14 years (OR = 1.53, 95% IC = 1.13-2.08) and late menarche (in the group with menarche after 17 year of ages OR = 3.22, 95% IC = 1.06-9.77). In relation to the Early Cancer Detection program, an important number of women made use of the program when they showed symptoms. The prevalence among women who had at least one symptom was 43.09 per cent. Women with a tumor at the cervical level at the time of the cytology were 7.76 times more likely to have of uterine cervix cancer (95% IC = 4.84-13.15). Symptoms such as dysfunctional bleeding (OR 2.79, IC 95% = 1.90-4.12), metrorrhagia (OR 2.66, 95% IC 1.83-3.86) and bloody leukorrhea (OR 2.64, 95% IC 2.05-3.38) can be relevant findings in women at high risk. The attributable fraction of higher exposure in the presence of gynecological signs and symptoms is the cervical tumor, with 87.46 per cent.(ABSTRACT TRUNCATED AT 250 WORDS)
[NAFTA: a challenge and an opportunity for environmental health. The case of the maquila industry]
PubMed, Nov 1, 1994
The three countries that have signed the North American Free Trade Agreement (NAFTA) have focused... more The three countries that have signed the North American Free Trade Agreement (NAFTA) have focused particular interest and concern on the potential impact that this agreement will have on the environmental health, based on the premise that economical development should not detriment neither the environment nor the human health. In this paper, the NAFTA is presented as an opportunity to improve environmental and occupational health in Mexico and assumes that the study of the potential impact of NAFTA could help to find the solutions of the former and actual environmental health problems. From this perspective, the north-border maquila industry is analyzed as a case study for the purpose of identifying and predicting the impact of NAFTA on environmental and the occupational health. Preventive as well as control measurements are suggested. The general characteristics of the U.S.-Mexico border and the maquila industry are presented. The lack of both social investment and urban planning along with population and economical growth are described. An explanation of the impact that these factors have had on the environmental and occupational problems is discussed. Special emphasis is given to the human health problems including that of water, air and soil contamination by industrial toxic residues. Also, some possible health impact of NAFTA are outlined. Finally a sustainable developmental intervention is suggested, based on NAFTA as an opportunity to take advantage of coming structural changes that will improve the environmental health conditions at the northern-border and in the entire country.
Relación entre inteligencia emocional y cociente intelectual de los alumnos del 6to. grado de primaria de las instituciones educativas públicas de la zona urbana de San Juan Bautista - 2008
Anales De Pediatria, 2001
La hipomagnesemia familiar con hipercalciuria y nefrocalcinosis es un síndrome poco frecuente que... more La hipomagnesemia familiar con hipercalciuria y nefrocalcinosis es un síndrome poco frecuente que pertenece a un grupo de tubulopatías de naturaleza heterogénea, cuya característica común es la pérdida urinaria de magnesio. Se presenta el caso de un niño de 9 años de edad con sintomatología de poliuria, polidipsia y enuresis. Existía nefrocalcinosis ecográfica y radiológica. Se encontró hipomagnesemia, normopotasemia, hipermagnesiuria, hipercalciuria, acidosis tubular distal incompleta, hipocitraturia e insuficiencia renal leve. El tratamiento con sales de magnesio, hidroclorotiacida, citrato potásico y bicarbonato sódico no ha conseguido normalizar ni la magnesiuria ni la calciuria. La función renal y la nefrocalcinosis permanecen estables tras 3 años de control. Se trata de un nuevo caso de este raro síndrome producido por un defecto congénito de la resorción tubular de magnesio, y su evolución clínica y analítica tras 3 años de seguimiento.
Factores de riesgo y cáncer cervicouterino en pacientes atendidas en la unidad de prevención y control de cáncer ginecológico el Hospital Apoyo, 2015
Mitigation tools for jellyfish impact in coastal area through collaborative citizen science approach
Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives - North Meets South,... more Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives - North Meets South, 22-27 February 2015, Granada, SpainDuring the last years, jellyfish proliferations have been a common topic in coastal areas mainly due to the socio-economic impacts associated. Developing mitigation tools is one way of reducing this impact and we believe that information is a strong countermeasure against this problem. In the framework of the Med-Jellyrisk Project, the MEDJELLY mobile application, available for Spain, Malta and Tunisia, is working daily during the summer season to provide citizens real-time information about jellyfish presence in coastal areas. In the Catalan coast (Spain), this mobile App works within a collaborative citizen science approach, involving coastal municipalities and administrations through a jellyfish observation network formed by trained personnel from the Rescue Services of 260 beaches. Volunteers collect the information about presence of jellyfish, together with flag status and some environmental parameters every morning, which is validated by jellyfish experts and posted daily in the application. Results showed that this kind of tools are nicely welcome among society as a way of providing users a useful tool against jellyfish outbreaks and volunteers participation being rewarded by public information feedback on jellyfish awarenessPeer Reviewe
Toxicology Letters, 2016
Results: A total of 61 patients with drug-induced skin reactions, divided into 35 adult patients ... more Results: A total of 61 patients with drug-induced skin reactions, divided into 35 adult patients and 26 children were included. Twelve adults (34%) were men and 23 women (65%). Of the children, 11 were boys (42%) and 15 girls (58%). The most affected gender was female adults, while children had a higher condition. The most frequent was the NET entity with 36 individuals, representing 59% of cases and the lowest frequency was represented by DRESS syndrome and SJS/NET with 25 cases each (41%). The etiology was found to be carbamazepine in 40 cases, causing the largest number of drug-induced skin reactions; trimethoprimsulfamethoxazole and phenytoin showed to be involved in 21 cases. Conclusions: Based on the casuistry of our Poison Control Center, the most frequent drug-induced skin reactions were NET, which does not correlate with written literature. Another result obtained corresponds to the drug most frequently related to drug-induced skin reactions was carbamazepine.
Facultades De Comprobacion y Los Derechos De Los Contribuyentes
Journal of Pharmacogenomics & Pharmacoproteomics, 2013
Objective: This cross-sectional study was aimed at determining the allele frequencies for the CYP... more Objective: This cross-sectional study was aimed at determining the allele frequencies for the CYP2C19*2, CYP2C19*3, CYP2D6*10 and PON1 (rs662) polymorphisms in the Puerto Rican population. The CYP2C19, CYP2D6 and PON1 genes are known to be associated with functional changes in drug metabolism and activation. Individuals carrying the aforementioned polymorphisms are at a higher risk of suffering from drug-induced adverse events and/ or unresponsiveness from a variety of drugs that includes antidepressants, atypical antipsychotics and antiplatelet compounds. Information on the frequency of these polymorphisms is more commonly found on homogeneous populations, but is scarce in highly heterogeneous populations like Hispanics, as in the case of Puerto Ricans. Genotyping was carried out in 100 genomic DNA samples from dried blood spots supplied by the Puerto Rican Newborn Screening program using Taqman ® Genotyping Assays. The Minor Allele Frequencies (MAF) obtained were 9% for CYP2C19*2 and CYP2D6*10, 50% for PON1 (rs662), while the CYP2C19*3 variant was not detected in our study. Furthermore, Hardy Weinberg equilibrium analysis was assessed as well as a comparison between Puerto Rico and other reference populations using a Z-test for proportions. The observed allele and genotype frequencies on these relevant pharmacogenes in Puerto Ricans were more closely related to those early reported in two other reference populations of Americans (Mexicans and Colombians).
![Research paper thumbnail of [Reproducibility of a questionnaire for studying climacteric]](https://attachments.academia-assets.com/121829826/thumbnails/1.jpg)
Salud pública de México
This study evaluated the reproducibility of a questionnaire concerned with the clinical and epide... more This study evaluated the reproducibility of a questionnaire concerned with the clinical and epidemiological aspects of menopause. The study population consisted of a hundred perimenopausal Mexican women seeking care at gynecology and obstetric health care services. Their participation was voluntary and they answered the same questionnaire two times with a 15-30 day lag between each application. The Kappa coefficient was high (0.81-1.0) for categorical variables such as: type of menstrual cycles, type of menopause, breast-feeding, use of estrogen during menopause and use of hormonal contraceptives. The Kappa coefficient was moderate (0.7-0.8) for symptoms related to menopause such as hot flashes, sweating, painful coitus, vaginal dryness and a decrease in libido. Mean differences were calculated for continuous variables such as age at menarche, age at menopause, time using estrogen and the duration of breast-feeding, the majority had a value of zero and 95% confidence intervals for t...
[Research in Mexico on the health impact of environmental chemical pollutants]
Salud pública de México
This paper is intended to offer a qualitative and quantitative diagnosis on publications concerne... more This paper is intended to offer a qualitative and quantitative diagnosis on publications concerned with human health impact of exposure to environmental chemical pollutants in Mexico. The review of these subjects included scientific papers on studies carried out in Mexico, published both in Mexican and international journals. The articles were analyzed according to the following criteria: chemical pollutants, type of study and institution that conducted it, study population, design, and analysis of data. The article concludes that publications in this field are scarce. Moreover, this review showed that there is little diversity, limited methodology and an unequal distribution of the human and material resources for research. All this indicates a rudimentary level of scientific knowledge in Mexico regarding public health implications of chemical pollutants.
[Beliefs about chili pepper consumption and health in Mexico City]
Salud pública de México
Eating chili peppers is a cultural tradition in Mexico. Controversial characteristics have been e... more Eating chili peppers is a cultural tradition in Mexico. Controversial characteristics have been empirically associated to chili pepper consumption and human health. In this paper, the beliefs about the health impacts of chili pepper consumption in two independent groups of Mexico City residents are described. The results confirm, on the one hand, that there is a wide variety of health benefits and damages associated with chili pepper consumption, but on the other hand, that the levels of chili pepper consumption are not related to beliefs about its human health impact.
Sponge versus diaphragm for contraception
Reviews, 2002
The contraceptive vaginal sponge was developed as an alternative to the contraceptive diaphragm. ... more The contraceptive vaginal sponge was developed as an alternative to the contraceptive diaphragm. The sponge, made of polyurethane impregnated with nonoxynol-9 (1g), releases 125 mg of the spermicide over 24 hours of use. Unlike the diaphragm, the sponge can be used for more than one coital act within 24 hours without the insertion of additional spermicide, and the sponge does not require fitting or a prescription from a physician. How the sponge compares with the diaphragm in terms of efficacy and continuation is not clear. To compare the efficacy and continuation rates of the sponge with the diaphragm (used with nonoxynol-9). Our a priori hypothesis was that the sponge would have higher rates for failure and discontinuation than the diaphragm. In April 2013, we searched the computerized databases MEDLINE, POPLINE, LILACS, CENTRAL, ClinicalTrials.gov and ICTRP.Earlier searches also included EMBASE. For the initial review, we searched the reference lists of relevant articles and book chapters.We also contacted investigators involved with the identified trials for other published or unpublished trials. We included randomized controlled trials comparing the vaginal contraceptive sponge (Today; Collatex) with any diaphragm used with nonoxynol-9 to prevent pregnancy. We examined the studies identified through the literature searches for possible inclusion and evaluated their methodological quality using the Cochrane guidelines. We entered data into RevMan and calculated Peto odds ratios for overall pregnancy and 12-month discontinuation using numbers of women as the denominator. We also abstracted 12-month cumulative life-table ratios for these same outcomes but were unable to aggregate these data. Two trials met the inclusion criteria. The sponge was significantly less effective in both trials in preventing overall pregnancy than was the diaphragm. In the larger USA trial, the 12-month cumulative life-table termination rates per 100 women for overall pregnancy were 17.4 for the sponge and 12.8 for the diaphragm. The rates were 24.5 for the sponge and 10.9 for the diaphragm in the UK trial.Similarly, discontinuation rates at 12 months were higher with the sponge than with the diaphragm (Odds ratio 1.31; 95% CI 1.07 to 1.59). Allergic-type reactions were more common with the sponge, although discontinuation for discomfort differed in the two trials.No new trials have been identified since the initial review. The sponge was less effective than the diaphragm in preventing pregnancy.Discontinuation rates were higher at 12 months as well.Other randomized controlled trials will be needed to resolve the potential role of spermicides in preventing sexually transmitted infections or in causing adverse effects
Revista de Matemática: Teoría y Aplicaciones, 2010
El Problema de Coloración Robusta (PCR), es un problema combinatorio del tipo NP-duro del cual ya... more El Problema de Coloración Robusta (PCR), es un problema combinatorio del tipo NP-duro del cual ya se conocen varios algoritmos heurísticos rápidos y eficientes que lo resuelven. En el presente trabajo se plantea el problema de asignación de frecuencias para telefonía celular como un PCR: se proponen algunas instancias con este modelo para una red de celulares y se resuelven estas instancias con un algoritmo GRASP. Los resultados indican que se pueden disminuir las interrupciones intermitentes en el servicio y además aumentar la capacidad de la red en aproximadamente un 25%.
Historia y Comunicación Social, 2014
Entrar en la vida de Lola Rodríguez Tío es revivir el siglo XIX antillano. Conocer su vida, poesí... more Entrar en la vida de Lola Rodríguez Tío es revivir el siglo XIX antillano. Conocer su vida, poesías, artículos periodísticos, pensamientos, cartas, dedicatorias, escritos, inquietudes e ideales es rebuscar en las luchas antillanas, caribeñas y americanas del inigualable siglo XIX.
Efectividad de los medios alternativos de comunicacion en una campana de mercadotecnia social para motivar cambios de habitos en la poblacion
Derechos Reservados © 2008-2011 Universidad de las Américas Puebla. Centro Interactivo de Recurso... more Derechos Reservados © 2008-2011 Universidad de las Américas Puebla. Centro Interactivo de Recursos de Información y Aprendizaje, CIRIA. Santa Catarina Mártir, San Andrés Cholula, Puebla. CP 72820. México.
Salud Pública de México, 1994
ÜBLICA jr México Salud Pública de México Instituto Nacional de Salud Pública [email protected] ISS... more ÜBLICA jr México Salud Pública de México Instituto Nacional de Salud Pública [email protected] ISSN (Versión impresa): 0036-3634 ISSN (Versión en línea): 1606-7916 MÉXICO 1994 Javier Ortega Cesena / Felipe Espinosa Torres / Lizbeth Lopez Carrillo EL ...
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Papers by LIZBETH BEATRIZ GONZALEZ LOPEZ