Variabilidad estacional de la productividad primaria y su relación con la estratificación vertical en la Bahía de la Paz, B. C. S.

Primary productivity (pp) during October of 1996, March, April, May, June, July, September, November of 1997 and January of 1998, was estimated via natural fluorescence in La Paz bay. Simultaneously to pp vertical temperatura profiles (CTD) were registered to determine the structure of the water column, which was calculated by using the stratification index (?) from 0 to 100 m depth. The highest average values in pp (16 mg C m-3 h-1) were observed during the spring and the minimum values of ? (50 J m-3)  corresponded to a almost homogeneous water column. In contrast, to other seasons (summer and autumn), the pp fell to minimum values (2 to 5 mg C m-3 h-1), while ? increased significantly (249 and 347 J m-3). The results indicated a lineal dependence between pp and water column mixture (r2 = 0.62, p <0.05) during the summer months. Periods with high stratification seem to inhibit the fertilization on the surface layer, while the well mixed water column facilitate the fertilization process. Therefore, it is evident that the water column stratification in La Paz bay plays an important role mechanism that controls the pp and partially explains the seasonal variability.Se estimó la productividad primaria (pp) vía fluorescencia natural en la bahía de La Paz durante octubre de 1996, marzo, abril, mayo, junio, julio, septiembre, noviembre de 1997, y enero de 1998. Simultáneamente a los registros de pp se realizaron perfiles verticales de temperatura (CTD) para determinar la estructura de la columna de agua, y de los cuales se estimó el índice de estratificación (?) de 0 a 100 m de profundidad. Durante primavera se observaron los valores promedio más altos de pp (16 mg C m-3 h-1) y valores bajos de ? (50 J m-3) que corresponden a una columna de agua casi homogénea. En contraste, en las subsecuentes estaciones (verano y otoño), la pp decreció a valores mínimos (2 y 5 mg C m-3 h-1), mientras que ? se incrementó significativamente (249 y 347 J m-3). Los resultados indican que existe una dependencia lineal de la pp y la mezcla en la columna de agua (r2 = 0.62, p<0.05) durante los meses de verano. Periodos con una alta estratificación tienden posiblemente a inhibir la fertilización de la capa superficial, mientras que una columna de agua bien mezclada facilita el proceso de fertilización. Por lo tanto, es evidente que en la Bahía de La Paz la estratificación asume un papel importante como mecanismo que controla la pp y explica parcialmente la variabilidad estacional observada en la bahía

Calentamiento por radiofrecuencia para esterilizar pinus radiata como material para embalajes. Parte 1: Tiempo total de tratamiento

In this work the total heating time was studied using radio frequency to sterilize wood packaging material of Pinus radiata, through the conditions 56 ° C and 60 ° C for 30 and 1 minutes respectively, according to international phytosanitary norms. The experimental tests were carried out in a laboratory radiofrequency equipment of 3 m3 capacity. The heating time was determined and prediction models were developed, depending on the thickness, plaque separation and wood loading volume, with confidence levels above 90%. The results showed that the total time of radiofrequency sterilization was greater in the surface of the pile and were statistically similar under both treatment conditions

“CLUPS”: A New Culture Medium for the Axenic Growth of Entamoeba histolytica

Amebiasis remains a major health problem in Mexico. Terefore, the search for better culture media and low-cost diagnostic and therapeutic tools is fundamental. We present a new culture medium for Entamoeba histolytica which allows the microbe to preserve its virulence factors and ability to induce hepatic abscesses in animal models. Te novel CLUPS medium is an improved version of the PEHPS medium, previously designed in our laboratory. Te main diference is the substitution of raw beef liver in PEHPS by raw beef lung in the CLUPS medium. To compare the performance of three-culture media (traditional TYI-S-33, PEHPS, and CLUPS), E. histolytica trophozoites were cultured in quintuplicate, followed by the evaluation of phospholipase activity and the induction of liver abscesses in golden hamsters. E. histolytica trophozoites grew signifcantly better in CLUPS medium than in TYIS-33. Likewise, CLUPS-cultured trophozoites produced signifcantly more phospholipases than TYI-S-33-cultured trophozoites. Finally, trophozoites grown in any of the three tested media had similar potential to induce liver abscesse

Eficacia y seguridad de la técnica coplanar en comparación con las técnicas de derotación convencional para la corrección quirúrgica de deformidades de la columna vertebral: una evaluación de tecnología sanitaria en niños, jóvenes y adultos

A health technology assessment (HTA) was carried out to critically analyze the evidence on the efficacy and safety of the surgical correction of spinal deformities using the coplanar technique, compared to the conventional derotation techniques, in children, adolescents and adults. A systematic search of the literature was carried out in the PubMed, Cochrane Library and LILACS databases. In addition, a manual search was carried out in the reference lists of the included studies, on Google and on the websites of specialized societies and groups that produce clinical practice guidelines (CPG) and HTA. In addition, we searched ClinicalTrials.gov and the International Clinical Trial Registry Platform (ICTRP) for clinical trial records in progress or not completed. Five documents were selected for evaluation, including two CPG, a randomized clinical trial, and two observational studies. After a critical evaluation of the evidence, it was concluded that both techniques showed a similar efficacy profile in terms of relevant outcomes such as correction of curvatures in the coronal and sagittal planes, quality of life and surgical time. Likewise, the rates of screw malposition, complications and volume of blood loss did not show significant differences between both techniques. However, the profile of  opportunity cost of the systems that allow the application of the coplanar technique is not favorable in the context of the evaluation, due to its high cost concerning conventional systems.Se realizó una evaluación de tecnología sanitaria (ETS) con el objetivo de analizar críticamente la evidencia sobre la eficacia y seguridad de la corrección quirúrgica de las deformidades de la columna vertebral con el uso de la técnica coplanar, en comparación con la técnica de derotación convencional, en pacientes niños, jóvenes y adultos. Se llevó a cabo una búsqueda sistemática de la evidencia en las bases de datos de PubMed, Cochrane Library y LILACS. Además, se realizó una búsqueda manual en las listas de referencias de los estudios incluidos, así como, en Google y páginas web de sociedades especializadas y grupos que realizan guías de práctica clínica (GPC) y ETS. Adicionalmente, se buscó registros de estudios clínicos en ejecución o aún no terminados en ClinicalTrials.gov y el International Clinical Trial Registry Platform (ICTRP). Se seleccionaron cinco documentos para evaluación, incluyendo dos GPC, un ensayo clínico aleatorizado y dos estudios observacionales. Luego de la evaluación crítica de la evidencia, se concluyó que, ambas técnicas mostraron un perfil de eficacia similar en cuanto a desenlaces de relevancia como corrección de curvaturas en el plano coronal, sagital, calidad de vida y tiempo quirúrgico. Asimismo, las tasas de malposición de tornillos, complicaciones y volumen de pérdida sanguínea no mostraron diferencias significativas entre ambas técnicas. Sin embargo, el perfil de costo de oportunidad de los sistemas que permiten la aplicación de la técnica coplanar no es favorable en el contexto de la evaluación, debido a su alto costo en relación con los sistemas convencionales

Systematic Characterizations of Text Similarity in Full Text Biomedical Publications

Computational methods have been used to find duplicate biomedical publications in MEDLINE. Full text articles are becoming increasingly available, yet the similarities among them have not been systematically studied. Here, we quantitatively investigated the full text similarity of biomedical publications in PubMed Central.72,011 full text articles from PubMed Central (PMC) were parsed to generate three different datasets: full texts, sections, and paragraphs. Text similarity comparisons were performed on these datasets using the text similarity algorithm eTBLAST. We measured the frequency of similar text pairs and compared it among different datasets. We found that high abstract similarity can be used to predict high full text similarity with a specificity of 20.1% (95% CI [17.3%, 23.1%]) and sensitivity of 99.999%. Abstract similarity and full text similarity have a moderate correlation (Pearson correlation coefficient: -0.423) when the similarity ratio is above 0.4. Among pairs of articles in PMC, method sections are found to be the most repetitive (frequency of similar pairs, methods: 0.029, introduction: 0.0076, results: 0.0043). In contrast, among a set of manually verified duplicate articles, results are the most repetitive sections (frequency of similar pairs, results: 0.94, methods: 0.89, introduction: 0.82). Repetition of introduction and methods sections is more likely to be committed by the same authors (odds of a highly similar pair having at least one shared author, introduction: 2.31, methods: 1.83, results: 1.03). There is also significantly more similarity in pairs of review articles than in pairs containing one review and one nonreview paper (frequency of similar pairs: 0.0167 and 0.0023, respectively).While quantifying abstract similarity is an effective approach for finding duplicate citations, a comprehensive full text analysis is necessary to uncover all potential duplicate citations in the scientific literature and is helpful when establishing ethical guidelines for scientific publications

Promoción de alimentación saludable y segura, actividad física y huerta orgánica

La pandemia por COVID-19 ha profundizado carencias socio-económicas y nutritivas en poblaciones vulnerables. A través de este proyecto pretendimos reducirlas, fomentando los hábitos saludables y promoviendo la puesta en valor de los beneficios de una huerta orgánica en el hogar y en la escuela. Los objetivos del trabajo fueron: a) Capacitar a los docentes para ser agentes multiplicadores de una alimentación saludable e inocua y de actividad física; y al personal de cocina en buenas prácticas de manipulación de alimentos. b) Promover la huerta escolar con hábitos agroecológicos y reciclaje. Los destinatarios directos fueron los docentes y cocineras (80 personas) y los indirectos, los alumnos de ambas escuelas (436 personas). Se trabajó interdisciplinariamente, cada uno con una visión desde su disciplina, logrando un enfoque integral y efectivo en el logro de los objetivos planteados, además de un enriquecimiento personal. La modalidad de trabajo fue a distancia (virtual), mediante Talleres (Google Meet) con docentes de ambas escuelas, estimulando el intercambio activo de ideas y propuestas de trabajo con sus alumnos. Ofrecimos recursos y actividades en un aula Moodle, proponiendo Foros de intercambio de aportes, saberes y consultas para cada tema tratado en Taller. Se evaluó la participación de los docentes en los talleres a través de su asistencia y de las prácticas frente al alumnado escolar. Los escolares elaboraron enmiendas orgánicas y armaron huertas, donde sembraron, cosecharon y usaron esos productos. La huerta escolar se planteó como estrategia educativa de alto impacto para promover hábitos de “reducir, reutilizar y reciclar” lo que consumimos, y generar un consumo responsable, ecológico y sostenible

Ciprofibrate therapy in patients with hypertriglyceridemia and low high density lipoprotein (HDL)-cholesterol: greater reduction of non-HDL cholesterol in subjects with excess body weight (The CIPROAMLAT study)

BACKGROUND: Hypertriglyceridemia in combination with low HDL cholesterol levels is a risk factor for cardiovascular disease. Our objective was to evaluate the efficacy of ciprofibrate for the treatment of this form of dyslipidemia and to identify factors associated with better treatment response. METHODS: Multicenter, international, open-label study. Four hundred and thirty seven patients were included. The plasma lipid levels at inclusion were fasting triglyceride concentrations between 1.6–3.9 mM/l and HDL cholesterol ≤ 1.05 mM/l for women and ≤ 0.9 mM/l for men. The LDL cholesterol was below 4.2 mM/l. All patients received ciprofibrate 100 mg/d. Efficacy and safety parameters were assessed at baseline and at the end of the treatment. The primary efficacy parameter of the study was percentage change in triglycerides from baseline. RESULTS: After 4 months, plasma triglyceride concentrations were decreased by 44% (p < 0.001). HDL cholesterol concentrations were increased by 10% (p < 0.001). Non-HDL cholesterol was decreased by 19%. A greater HDL cholesterol response was observed in lean patients (body mass index < 25 kg/m(2)) compared to the rest of the population (8.2 vs 19.7%, p < 0.001). In contrast, cases with excess body weight had a larger decrease in non-HDL cholesterol levels (-20.8 vs -10.8%, p < 0.001). There were no significant complications resulting from treatment with ciprofibrate. CONCLUSIONS: Ciprofibrate is efficacious for the correction of hypertriglyceridemia / low HDL cholesterol. A greater decrease in non-HDL cholesterol was found among cases with excess body weight. The mechanism of action of ciprofibrate may be influenced by the pathophysiology of the disorder being treated

Morphometric characteristics of lumbar vertebral pedicles in Mexican population. Implications for transpedicular lumbar fusion surgery

Introduction. Spinal fusion surgery using transpedicular fixation is the most common technique for surgical treatment of spinal pathologies of any etiology. The morphometric characteristics of the vertebral pedicle determine the size and shape of pedicle implants. The objective of this study is to determine the morphometric characteristics of the lumbar vertebral pedicle in Mexican population by direct measurement of bone parts. Materials and Methods. We analyzed 65 L1–L5 cadaver lumbar spines from a collection of bone specimens from the Department of Human Anatomy. Pedicle width, height, and length were determined bilaterally in each sample studied. We obtained measures of central tendency, and parametric correlation tests were performed with a 95% confidence interval to determine if significant differences exist between the lumbar vertebral levels. Results. Pedicle width increased from L1 to L5. We obtained a minimum mean value of 7.40 ± 1.84 mm at L1 and a maximum mean value of 14.74 ± 3.77 mm at L5. Pedicle height decreased from L1 to L4 with a subsequent increase at L5. We obtained a maximum mean value of 18.32 ± 4.15 mm at L5 and minimum mean value of 14.09 mm ± 2.75 at L4. Significant differences were observed (P < 0.05) when groups were compared. Conclusions. This study accurately describes the morphometric characteristics of the lumbar vertebral pedicle. These data will be useful for correct selection and positioning of transpedicular screws

Ética, hermenéutica y política. Filosofía en el fondo

Esta obra colectiva de ensayos académicos dictaminados, inspirados en el ciclo de conferencias Filosofía en el Fondo, ofrece una rica y entretejida lectura que, en cuatro secciones (La ética ante el problema del mal, Diferencia y alteridad, Hermenéutica de la modernidad, e Intersticios políticos), profundiza los problemas humanos que resisten el paso del tiempo desde enfoques hermenéuticos, genealógicos y críticos.ITESO, A.C