Determinación ponderal de fibras en una mezcla y relación entre diametro y densidad aparente de la lana

Se hace un estudio crítico de los métodos corrientemente empleados en análisis de mezclas de fibras por microscopía, haciendo notar la imposibilidad de poder obtener resultados relativamente exactos al analizar mezclas en las que algunos de sus componentes son fibras celulósicas o proteicas, debido a que en los cálculos intervienen datos como el diámetro y la densidad de las mismas. El primero es determinado sin tener en cuenta que la fibra presenta poros sensibles dando lugar a un volumen aparente que al ser mayor que el volumen real (volumen de masa fibrilar sin huecos), hace que tenga que considerarse una densidad aparente, necesariamente menor que la real. El trabajo se orientó en el sentido de hallar un método factible de poder determinar la densidad aparente de cada fibra, con objeto de utilizarla en las fórmulas y método de análisis por contaje ya establecidos. Se determinó la densidad aparente de la lana en sus distintos tipos, encontrándose una correlación entre el diámetro y la densidad aparente, de la cual se deduce la ecuación analítica que liga estas dos variablesPeer Reviewe

Determinación ponderal de fibras en una mezcla y relación entre diametro y densidad aparente de la lana

Se hace un estudio crítico de los métodos corrientemente empleados en análisis de mezclas de fibras por microscopía, haciendo notar la imposibilidad de poder obtener resultados relativamente exactos al analizar mezclas en las que algunos de sus componentes son fibras celulósicas o proteicas, debido a que en los cálculos intervienen datos como el diámetro y la densidad de las mismas. El primero es determinado sin tener en cuenta que la fibra presenta poros sensibles dando lugar a un volumen aparente que al ser mayor que el volumen real (volumen de masa fibrilar sin huecos), hace que tenga que considerarse una densidad aparente, necesariamente menor que la real. El trabajo se orientó en el sentido de hallar un método factible de poder determinar la densidad aparente de cada fibra, con objeto de utilizarla en las fórmulas y método de análisis por contaje ya establecidos. Se determinó la densidad aparente de la lana en sus distintos tipos, encontrándose una correlación entre el diámetro y la densidad aparente, de la cual se deduce la ecuación analítica que liga estas dos variablesPeer Reviewe

Determinación ponderal de fibras en una mezcla y relación entre diametro y densidad aparente de la lana

Se hace un estudio crítico de los métodos corrientemente empleados en análisis de mezclas de fibras por microscopía, haciendo notar la imposibilidad de poder obtener resultados relativamente exactos al analizar mezclas en las que algunos de sus componentes son fibras celulósicas o proteicas, debido a que en los cálculos intervienen datos como el diámetro y la densidad de las mismas. El primero es determinado sin tener en cuenta que la fibra presenta poros sensibles dando lugar a un volumen aparente que al ser mayor que el volumen real (volumen de masa fibrilar sin huecos), hace que tenga que considerarse una densidad aparente, necesariamente menor que la real. El trabajo se orientó en el sentido de hallar un método factible de poder determinar la densidad aparente de cada fibra, con objeto de utilizarla en las fórmulas y método de análisis por contaje ya establecidos. Se determinó la densidad aparente de la lana en sus distintos tipos, encontrándose una correlación entre el diámetro y la densidad aparente, de la cual se deduce la ecuación analítica que liga estas dos variable

Behavior of hospitalized severe influenza cases according to the outcome variable in Catalonia, Spain, during the 2017-2018 season

Altres ajuts: Programme of Prevention, Surveillance and Control of Transmissible Diseases (PREVICET); CIBER de Epidemiología y Salud Pública (CIBERESP).Influenza is an important cause of severe illness and death among patients with underlying medical conditions and in the elderly. The aim of this study was to investigate factors associated with ICU admission and death in patients hospitalized with severe laboratory-confirmed influenza during the 2017-2018 season in Catalonia. An observational epidemiological case-to-case study was carried out. Reported cases of severe laboratory-confirmed influenza requiring hospitalization in 2017-2018 influenza season were included. Mixed-effects regression analysis was used to estimate the factors associated with ICU admission and death. A total of 1306 cases of hospitalized severe influenza cases were included, of whom 175 (13.4%) died and 217 (16.6%) were ICU admitted. Age 65-74 years and ≥ 75 years and having ≥ 2 comorbidities were positively associated with death (aOR 3.19; 95%CI 1.19-8.50, aOR 6.95, 95%CI 2.76-1.80 and aOR 1.99; 95%CI 1.12-3.52, respectively). Neuraminidase inhibitor treatment and pneumonia were negatively associated with death. The 65-74 years and ≥ 75 years age groups were negatively associated with ICU admission (aOR 0.41; 95%CI 0.23-0.74 and aOR 0.30; 95%CI 0.17-0.53, respectively). A factor positively associated with ICU admission was neuraminidase inhibitor treatment. Our results support the need to investigate the worst outcomes of hospitalized severe cases, distinguishing between death and ICU admission

Neuraxial analgesia is not associated with an increased risk of post-partum relapses in MS

International audienceBackground: Obstetrical analgesia remains a matter of controversy because of the fear of neurotoxicity of local anesthetics on demyelinated fibers or their potential relationship with subsequent relapses.Objective: To assess the impact of neuraxial analgesia on the risk of relapse during the first 3 months post-partum, with a focus on women who experienced relapses during pregnancy.Methods: We analyzed data of women followed-up prospectively during their pregnancies and at least 3 months post-partum, collected in the Pregnancy in Multiple Sclerosis (PRIMS) and Prevention of Post-Partum Relapses with Progestin and Estradiol in Multiple Sclerosis (POPARTMUS) studies between 1992-1995 and 2005-2012, respectively. The association of neuraxial analgesia with the occurrence of a post-partum relapse was estimated by logistic regression analysis.Results: A total of 389 women were included, 215 from PRIMS and 174 from POPARTMUS. In total, 156 women (40%) had neuraxial analgesia. Overall, 24% experienced a relapse during pregnancy and 25% in the 3 months post-partum. Women with a pregnancy relapse were more likely to have a post-partum relapse (odds ratio (OR) = 1.83, p = 0.02), independently of the use of neuraxial analgesia. There was no association between neuraxial analgesia and post-partum relapse (OR = 1.08, p = 0.78).Conclusion: Neuraxial analgesia was not associated with an increased risk of post-partum relapses, whatever multiple sclerosis (MS) activity during pregnancy

Processes in Pathogenic Biocolloidal Contaminants Transport in Saturated and Unsaturated Porous Media: A Review

There are several classes of subsurface colloids, abiotic and biotic. Basically, small particles of inorganic, organic and pathogenic biocolloids variety exist in natural subsurface system. Transport of these pathogenic biocolloidal contaminants (Viruses, bacteria and protozoa) pose a great risk in water resources and have caused large outbreaks of waterborne diseases. Biocolloid transport processes through saturated and unsaturated porous media is of significant interest, from the perspective of protection of groundwater supplies from contamination, assessment of risk from pathogens in groundwater and for the design of better water treatment systems to remove biocolloids from drinking water supplies This paper has reviewed the large volume of work that has already been done and the progress that has been made towards understanding the various basic multi-processes to predicting the biocolloid transport in saturated and unsaturated porous media. There are several basic processes such as physical, chemical and biological processes which are important in biocolloid transport. The physical processes such as advection, dispersion, diffusion, straining and physical filtration, adsorption and biological processes such as growth/decay processes and include active adhesion/detachment, survival and chemotaxis are strongly affected on biocolloid transport in saturated and unsaturated porous media.The unsaturated zone may play an important role in protecting aquifers from biocolloidal contamination by retaining them in the solid phase during their transport through the zone. Finally, author here highlighted the future research direction based on his critical review on biocolloid transport in saturated and unsaturated porous media