Absorption and reaction of CO2 in capillaries

The process of carbon dioxide (CO2) reduction to value-added chemicals is being extensively studied worldwide. The main purpose is to decrease emissions to the environment that are associated with global warming, as well as the creation of renewable and sustainable energy sources. In the aforementioned process, the absorption of CO2 is of paramount importance as well as the reactor where the CO2 conversion takes place. In this context, the objective of this chapter is to present and analyze the results of the CO2 absorption in alkaline solutions in capillary reactors. A hydrodynamic study is included in order to establish the operational window of liquid and gas velocities in order to achieve the Taylor flow regime. All experiments were conducted in a capillary reactor (dc = 3 mm). The studied variables were temperature, NaOH concentration (0-0.75 M) and capillary length (300 and 100 mm). It was found that the volumetric mass transfer coefficient of the absorption of CO2 in water increases when the temperature decreases, while the CO2 absorption in NaOH solutions increases directly with temperature. By means of the Ha number, it was concluded that the mass transfer controlled the absorption process when usingalkaline solutions.CONACYT SCHOLARSHIP (239954) CONACYT Project No. 269093 UAEMEX project 6235/2020CI

Moxifloxacin versus Clindamycin/Ceftriaxone in the management of odontogenic maxillofacial infectious processes: a preliminary, intrahospital, controlled clinical trial

Background: The aim of this study was to compare the days of hospitalization length between patients treated with Moxifloxacin with that of patients treated with a Clindamycin/Ceftriaxone combination and additionally, to isolate and identify the oral pathogens involved in orofacial odontogenic infections. Material and Methods: A pilot-controlled-clinical-trial was carried out on hospitalized patients with cervicofacial odontogenic abscesses or cellulitis, who were randomly asigned to two study groups: 1) patients who received Moxifloxacin, and 2) patients receiving Clindamycin/Ceftriaxone combination. Infiltrate samples were collected through transdermic or transmucosal punction and later cultured on a media specific for aerobic and anaerobic microorganisms. Mean hospitalization duration in days until hospital discharge and susceptibility assessment in rates were established. Results: Mean hospitalization time in days of patients treated with Moxifloxacin was 7.0 ± 1.6 days, while in the Clindamycin/Ceftriaxone group, this was 8.4 ± 1.8 days, although significant difference could not be demonstrated ( p =0.074). A total of 43 strains were isolated, all of these Gram-positive. These strains appeared to be highly sen - sitive to Moxifloxacin (97.5%) and Ceftriaxone (92.5%). Conclusions: Moxifloxacin and Ceftriaxone appear to be potential convenient and rational alternatives to traditional antibiotics, for treating severe odontogenic infections, in conjunction with surgical extraoral incision, debridement, and drainage

Prevalence and genotype distribution of cervical human papilomavirus infection in the pre-vaccination era: a population-based study in the Canary Islands

Objective: National Spanish studies show that prevalence of cervical human papillomavirus (HPV) infection in the female population is increasingly frequent, with an overall estimate of 14% in women aged 18-65 years. The objective of this study is to know the prevalence and distribution of HPV types in the female population of the Canary Islands prior to the introduction of HPV vaccines and to investigate the associated clinical and sociodemographic factors. Methods: Based on the Primary Health Care database, a sample of adult women (aged 18-65 years) of Gran Canaria (GC) and Tenerife (TF) stratified into nine age groups was carried out between 2002 and 2007. Women were contacted by postal letter and telephone call and were visited in their primary care centre. A clinical-epidemiological survey was completed and cervical samples were taken for cytological study and HPV detection. HPV prevalence and its 95% CI were estimated, and multivariate analyses were performed using logistic regression to identify factors associated with the infection. Results: 6010 women participated in the study, 3847 from GC and 2163 from TF. The overall prevalence of HPV infection was 13.6% (CI 12.8%-14.5%) and 11.1% (CI 10.3%-11.9%) for high-risk types. The most frequent HPV type was 16 followed by types 51, 53, 31, 42 and 59. HPV types included in the nonavalent vaccine were detected in 54.1% of infected women. Factors associated with an increased risk of infection were: young ages (18-29 years), the number of sexual partners throughout life, not being married, being a smoker, and having had previous cervical lesions or genital warts. Conclusions: It is confirmed that prevalence of HPV infection in the female population of the Canary Islands is high, but similar to that of Spain, HPV 16 being the most frequent genotype. The determinants of infection are consistent with those of other populations

Evolución de la Auditoría Financiera en América Latina: Un Análisis Comparativo de los Países De Ecuador y Colombia periodo 2009-2019

Tesis previa obtención del título de Licenciado/a en Contabilidad y Auditoría CPALa presente investigación tiene como objetivo principal analizar la evolución de la auditoría financiera en América Latina: caso Ecuador y Colombia, correspondiente al periodo 2009-2019. La metodología fue abordada bajo un enfoque cualitativo, con un método descriptivo y un diseño no experimental, la técnica utilizada fue análisis de contenido cualitativo de 35 documentos que fueron archivados en el instrumento CHECK LIST conformado una base de datos. Los resultados obtenidos, evidencian que la auditoría financiera es una herramienta fundamental para las organizaciones, por cuanto permite identificar la razonabilidad o desviaciones que pueden presentar los estados financieros, de acuerdo con la opinión profesional e independiente que emite el auditor. Se concluye que la auditoría financiera ha ido evolucionando y progresando permanentemente con los avances tecnológicos, políticos y sociales

Determinación del contenido de cobre en papa variedad parda pastusa, por absorción atómica, como parte de la evaluación de trazabilidad de un fungicida ecológico para control de Phytophthora infestans

83 páginas : gráficas, fotografíasCon el fin de evaluar parte de la trazabilidad del fungicida CERAQUINT SP se realizo el ensayo por BCA (bloques completos al Azar), haciendo 5 tratamientos, un testigo absoluto, una muestra comercial y tres dosificaciones diferentes de CERAQUINT SP (3.5, 7.0 y 14 g/l), para determinar la concentración de cobre en foliar y tubérculo se recolectaron las muestras de foliar dos días después de cada aplicación y se hicieron los procedimientos descritos hasta llegar a la determinación cuantitativa de cobre por espectrofotometría de absorción atómica, adaptando la norma técnica Colombiana NTC 1369 (Fertilizantes. Determinación de boro, calcio, cobalto, cobre, hierro, magnesio, manganeso, molibdeno, níquel, silicio y zinc por absorción atómica) y la norma International Organization for Standarization ISO 7952 (Determinación de cobre en frutas y verduras) terminando con la recolección de tubérculo y haciendo las mismas determinaciones utilizando las mismas técnicas. Se realizaron 2 análisis de suelo uno antes de iniciar el ensayo en campo y otro finalizando el ensayo para determina residualidad de cobre proveniente del fungicida.Incluye bibliografi

Serie Ciencia

El presente libro tiene como propósito principal impulsar el debate y la reflexión colectiva para alcanzar a lo largo de la década las metas científicas, sociales y cívicas a las que nos hemos comprometido de forma colectiva. Ello exige situa el conocimiento científico y las estrategias para el conjunto de los ciudadanos accedan a él entre los factores centrales del desarrollo humano.Organización de Estados Iberoamericanos, OE

Prevalence and genotype distribution of cervical human papilomavirus infection in the pre-vaccination era: a population-based study in the Canary Islands

Objective National Spanish studies show that prevalence of cervical human papillomavirus (HPV) infection in the female population is increasingly frequent, with an overall estimate of 14% in women aged 18–65 years. The objective of this study is to know the prevalence and distribution of HPV types in the female population of the Canary Islands prior to the introduction of HPV vaccines and to investigate the associated clinical and sociodemographic factors.Methods Based on the Primary Health Care database, a sample of adult women (aged 18–65 years) of Gran Canaria (GC) and Tenerife (TF) stratified into nine age groups was carried out between 2002 and 2007. Women were contacted by postal letter and telephone call and were visited in their primary care centre. A clinical-epidemiological survey was completed and cervical samples were taken for cytological study and HPV detection. HPV prevalence and its 95% CI were estimated, and multivariate analyses were performed using logistic regression to identify factors associated with the infection.Results 6010 women participated in the study, 3847 from GC and 2163 from TF. The overall prevalence of HPV infection was 13.6% (CI 12.8%–14.5%) and 11.1% (CI 10.3%–11.9%) for high-risk types. The most frequent HPV type was 16 followed by types 51, 53, 31, 42 and 59. HPV types included in the nonavalent vaccine were detected in 54.1% of infected women. Factors associated with an increased risk of infection were: young ages (18–29 years), the number of sexual partners throughout life, not being married, being a smoker, and having had previous cervical lesions or genital warts.Conclusions It is confirmed that prevalence of HPV infection in the female population of the Canary Islands is high, but similar to that of Spain, HPV 16 being the most frequent genotype. The determinants of infection are consistent with those of other populations

Diagnostic yield of chest and thumb ECG after cryptogenic stroke, Transient ECG Assessment in Stroke Evaluation (TEASE): an observational trial

Objective In stroke survivors, atrial fibrillation (AF) is typically evaluated solely by short-term ECG monitoring in the stroke unit. Prolonged continuous ECG monitoring or insertable cardiac monitors require substantial resources. Chest and thumb ECG could provide an alternative means of AF detection, which in turn could allow prompt anticoagulation to prevent recurrent stroke. The objective of this study was to assess the yield of newly diagnosed AF during 28 days of chest and thumb ECG monitoring two times per day in cryptogenic stroke.Methods This study, Transient ECG Assessment in Stroke Evaluation, included patients who had a stroke from Region Gävleborg, Sweden, between 2017 and 2019. Patients with a recent ischaemic stroke without documented AF (or other reasons for anticoagulation) before or during ECG evaluation in the stroke unit were evaluated using the Coala Heart Monitor connected to a smartphone application for remote monitoring.Results The prespecified number of 100 patients (mean age 67.6±10.8 years; 60% men) was analysed. In nine patients (9%, number needed to screen 11) AF but no other significant atrial arrhythmias (>30 s) was diagnosed. The mean CHA2DS2-VASc score was similar among patients with AF and no AF (4.9±1.1 vs 4.3±1.3; p=0.224) and patients with AF were older (74.3±9.0 vs 66.9±10.8; p=0.049). Patients performed on average 90.1%±15.0% of scheduled transmissions.Conclusion In evaluation of cryptogenic stroke, 9% of patients had AF detected using chest and thumb ECG two times per day during 1 month. In many stroke survivors, this is a feasible approach and they will be potentially protected from recurrent stroke by anticoagulation treatment.Trial registration number NCT03301662