Influence of the critical parameters on the density estimate of some fatty acids by the Rackett's method

9 páginas, 3 figuras, 3 tablas.[ES] En este trabajo se realiza un estudio comparativo de las propiedades críticas temperatura y presión en los ácidos grasos palmítico, esteárico y oléico, proporcionadas por diferentes fuentes bibliográficas. Estas propiedades se utilizan en la ecuación de Rackett para estimar la densidad de las sustancias puras. Se describen y emplean los métodos más comúnmente aplicados en estos casos para estimar dichas propiedades críticas. Se selecciona un conjunto de valores de propiedades críticas para aplicarlas en la estimación de la densidad por la ecuación de Rackett. Se proponen los valores de las propiedades críticas con los que se obtiene una mejor estimación de la densidad, cuando se compara con resultados experimentales. Se demuestra que la selección de las propiedades críticas influye de forma decisiva en la estimación de propiedades físicas mediante la ecuación de Rackett.[EN] In this work a comparative study is carried out of the critical properties of temperature and pressure applied for the palmitic, stearic and oleic fatty acids, provided by different bibliographical sources. These properties are used in the Rackett's equation to estimate the density of the pure substances. The most commonly employed methods are described and applied in these cases to estimate these critical properties. A group of values of critical properties is selected to estimate the density using the Rackett's equation. The values of the critical properties that give a better estimation of the density, according to Rackett's equation, when compared with the experimental results are proposed. It is demonstrated that the selection of the critical properties influences in a decisive way in the estimation of physical properties by means of the Rackett's equation.Los autores hacen constar su agradecimiento a: La Comisión Interministerial de Ciencia y Tecnología, por la ayuda recibida para la realización de este trabajo: ALI 95 0517. Al Instituto de Cooperación Iberoamericana (ICI), por la beca proporcionada para la realización de la Tesis Doctoral.Peer reviewe

The age again in the eye of the COVID-19 storm: evidence-based decision making

Coronavirus SARS-CoV-2; COVID-19; 2019-nCoV; Immunosenescència; ConfinamentCoronavirus SARS-CoV-2; COVID-19; 2019-nCoV; Inmunosenescencia; ConfinamientoCoronavirus SARS-CoV-2; COVID-19; 2019-nCoV; Immunosenescence; LockdownBackground One hundred fifty million contagions, more than 3 million deaths and little more than 1 year of COVID-19 have changed our lives and our health management systems forever. Ageing is known to be one of the significant determinants for COVID-19 severity. Two main reasons underlie this: immunosenescence and age correlation with main COVID-19 comorbidities such as hypertension or dyslipidaemia. This study has two aims. The first is to obtain cut-off points for laboratory parameters that can help us in clinical decision-making. The second one is to analyse the effect of pandemic lockdown on epidemiological, clinical, and laboratory parameters concerning the severity of the COVID-19. For these purposes, 257 of SARSCoV2 inpatients during pandemic confinement were included in this study. Moreover, 584 case records from a previously analysed series, were compared with the present study data. Results Concerning the characteristics of lockdown series, mild cases accounted for 14.4, 54.1% were moderate and 31.5%, severe. There were 32.5% of home contagions, 26.3% community transmissions, 22.5% nursing home contagions, and 8.8% corresponding to frontline worker contagions regarding epidemiological features. Age > 60 and male sex are hereby confirmed as severity determinants. Equally, higher severity was significantly associated with higher IL6, CRP, ferritin, LDH, and leukocyte counts, and a lower percentage of lymphocyte, CD4 and CD8 count. Comparing this cohort with a previous 584-cases series, mild cases were less than those analysed in the first moment of the pandemic and dyslipidaemia became more frequent than before. IL-6, CRP and LDH values above 69 pg/mL, 97 mg/L and 328 U/L respectively, as well as a CD4 T-cell count below 535 cells/μL, were the best cut-offs predicting severity since these parameters offered reliable areas under the curve. Conclusion Age and sex together with selected laboratory parameters on admission can help us predict COVID-19 severity and, therefore, make clinical and resource management decisions. Demographic features associated with lockdown might affect the homogeneity of the data and the robustness of the results.This work has been carried out without funding

Modeling a multilevel converter for radiography and fluoroscopy

EPE'16 ECCE Europe, 18th European Conference on Power Electronics and Applications, 5-9 september 2016, Karsruhe, GermanyIn this paper a mathematical model for a resonant multilevel converter is presented. The topology has been conceived to be used in X-ray power supplies. The power stage has been designed to minimize the resonant current throughout the input voltage range: 400V to 750V. The inverter stage is based on the series-parallel resonant topology, LCC, to include the parasitic elements of the step-up transformer. However, the introduction of an additional magnetic coupling provides a way to modify the reactive elements depending on the output powe

Are Traditional Lima Bean (Phaseolus lunatus L.) Landraces Valuable to Cope with Climate Change? Effects of Drought on Growth and Biochemical Stress Markers

[EN] Agrobiodiversity and adaptability to environmental changes derived from global warming are challenges for the future of agriculture. In this sense, landraces often have high levels of genetic variation, tightly connected with the changing environmental conditions of a territory. The genus Phaseolus, with five domesticated species, is one of the most important sources of proteins, carbohydrates and micronutrients in various countries. This study aimed to compare the adaptation capacity to drought, in the vegetative growth phase, of a commercial cultivar and two landraces traditionally cultivated in the Mediterranean basin of Phaseolus lunatus (Lima bean). Growth and biochemical responses of the analysed genotypes to different water¿deficit treatments were evaluated and compared. In addition, the effectiveness of the voltammetric method for evaluating stress levels in cultivated plants was tested. The studied parameters revealed that P. lunatus is a drought tolerant species, showing similar results for the three cultivars. However, contrary to what was expected from the germination phase results, the commercial variety Peru showed some better responses under water stress conditions. Finally, the voltammetric method proved to be a good and fast tool for assessing oxidative stress in cultivated plants, showing results in agreement with total phenolic compounds and total flavonoid fluctuations.Martínez-Nieto, MI.; González-Orenga, S.; Soriano, P.; Prieto-Mossi, J.; Larrea, E.; Doménech-Carbó, A.; Tofei, AM.... (2022). Are Traditional Lima Bean (Phaseolus lunatus L.) Landraces Valuable to Cope with Climate Change? Effects of Drought on Growth and Biochemical Stress Markers. Agronomy. 12(7):1-20. https://doi.org/10.3390/agronomy1207171512012

Hepatitis B: Inmunogenicidad de la vacuna recombinante cubana anti-hbv en trabajadores de la salud vacunados sin seroprotección

We measured ant-HBs to 153 health care workers in the Children Hospital Lorencita Villegas de Santos in Bogota who had receive Hepatitis B vaccine in the last 4 years. 124 had receive three doses (6 with booster), 18 two doses and 11 only one. They hadn't any positive titles in 25%, 33% and 73% respectively. Their average age was 40 years old. Then we gave 32 of the worker who has negative titles one 20 mgms dose of the Cuban recombinant vaccine and we measured blind titles before and 15 days after with ELISA quantitative method. 81% went into seroconversion (> O UYL), 75% seroprotection (> 10 IUIL) and 56% had levels over 100 UVL. This results are hilly significant and raises a possibility for health care workers who are "poor antibody responders" with other types of vaccines or even other population with the same problem.Medimos anti-HBVs a 153 trabajadores de la salud del Hospital Infantil Universitario, "Lorencita Villegas de Santos" en Santafé de Bogotá, a quien se les había vacunado contra la Hepatitis B en los últimos 4 años. 124 habían recibido tres dosis (6 con refuerzo), 18 dos dosis y 11 una sola dosis; no tenían títulos el 25%. 33% Y 73% respectivamente. Estos trabajadores tenían promedios de edad de 40 años. Se vacunaron 32 de estos trabajadores sin títulos con 1 dosis de 20 mgms de la vacuna cubana recombinante y se cuantificaron títulos anti-HBVs antes y 15 días después de la vacunación con método inmuno-enzimático cuantitativo a ciegas; obteniéndose seroconversión en el 81% (> UI/L), seroprotección en el 75% (> 10 UI/L), y 56% de los individuos tuvieron valores superiores a 100 UI/L. Estos resultados son altamente significativos y dan una alternativa para un grupo de trabajadores de la salud que no ha logrado títulos protectores y plantea un posibilidad para las poblaciones con factores que los cataloguen como "malos respondedores"

Microbial colonization and resistome dynamics in food processing environments of a newly opened pork cutting industry during 1.5 years of activity

Artículo versión publicadaBackground: The microorganisms that inhabit food processing environments (FPE) can strongly influence the associated food quality and safety. In particular, the possibility that FPE may act as a reservoir of antibiotic-resistant microorganisms, and a hotspot for the transmission of antibiotic resistance genes (ARGs) is a concern in meat processing plants. Here, we monitor microbial succession and resistome dynamics relating to FPE through a detailed analysis of a newly opened pork cutting plant over 1.5 years of activity. Results: We identified a relatively restricted principal microbiota dominated by Pseudomonas during the first 2 months, while a higher taxonomic diversity, an increased representation of other taxa (e.g., Acinetobacter, Psychrobacter), and a certain degree of microbiome specialization on different surfaces was recorded later on. An increase in total abundance, alpha diversity, and β-dispersion of ARGs, which were predominantly assigned to Acinetobacter and associated with resistance to certain antimicrobials frequently used on pig farms of the region, was detected over time. Moreover, a sharp increase in the occurrence of extended-spectrum β-lactamase- producing Enterobacteriaceae and vancomycin-resistant Enterococcaceae was observed when cutting activities started. ARGs associated with resistance to β-lactams, tetracyclines, aminoglycosides, and sulphonamides frequently co-occurred, and mobile genetic elements (i.e., plasmids, integrons) and lateral gene transfer events were mainly detected at the later sampling times in drains. Conclusions: The observations made suggest that pig carcasses were a source of resistant bacteria that then colonized FPE and that drains, together with some food-contact surfaces, such as equipment and table surfaces, represented a reservoir for the spread of ARGs in the meat processing facility.S

Configuración de servicios para gestión de infraestructuras it en zentyal server 6.0

ImágenesZentyal server es un sistema operativo servidor basado en Linux que tiene las herramientas para administrar todos los servicios de TI en una organización con la ventaja que se enfoca en la usabilidad y facilidad de las configuraciones, por medio de su interfaz gráfica web en este artículo está la descripción de la instalación del servidor y la configuración de los módulosZentyal server is a Linux-based server operating system that has the tools to manage all IT services in an organization with the advantage that focuses on the usability and facility of configurations, through its graphical web interface, in this article there is the description of the server installation and the configuration of the module

The transiting multi-planet system HD3167: a 5.7 MEarth Super-Earth and a 8.3 MEarth mini-Neptune

HD3167 is a bright (V=8.9 mag) K0V star observed by the NASA's K2 space mission during its Campaign 8. It has been recently found to host two small transiting planets, namely, HD3167b, an ultra short period (0.96 d) super-Earth, and HD3167c, a mini-Neptune on a relatively long-period orbit (29.85 d). Here we present an intensive radial velocity follow-up of HD3167 performed with the FIES@NOT, [email protected], and HARPS-N@TNG spectrographs. We revise the system parameters and determine radii, masses, and densities of the two transiting planets by combining the K2 photometry with our spectroscopic data. With a mass of 5.69+/-0.44 MEarth, radius of 1.574+/-0.054 REarth, and mean density of 8.00(+1.0)(-0.98) g/cm^3, HD3167b joins the small group of ultra-short period planets known to have a rocky terrestrial composition. HD3167c has a mass of 8.33 (+1.79)(-1.85) MEarth and a radius of 2.740(+0.106)(-0.100) REarth, yielding a mean density of 2.21(+0.56)(-0.53) g/cm^3, indicative of a planet with a composition comprising a solid core surrounded by a thick atmospheric envelope. The rather large pressure scale height (about 350 km) and the brightness of the host star make HD3167c an ideal target for atmospheric characterization via transmission spectroscopy across a broad range of wavelengths. We found evidence of additional signals in the radial velocity measurements but the currently available data set does not allow us to draw any firm conclusion on the origin of the observed variation.Comment: 18 pages, 11 figures, 5 table