Caracterización de la presentación del concepto de distribución de frecuencias en libros de texto de grado sexto en el municipio de Florencia-Caquetá

La presente ponencia se deriva de la investigación realizada durante el segundo semestre de 2017 con sexto semestre de la Licenciatura en Matemáticas y Física, en el espacio académico Estadística y Probabilidad, en el cual se identificaron falencias en la conceptualización e interpretación de distribución de frecuencias, generado posiblemente por la presentación en los libros de texto que conlleva a la réplica de esta misma forma por parte de los profesores. La pregunta de investigación giró en torno a cómo presentan los libros de texto del grado sexto el tema Distribución de Frecuencias en las instituciones educativas urbanas del municipio de Florencia-Caquetá. La investigación se ubica en la teoría de Transposición Didáctica y el análisis de contenido. Se realizaron encuestas a docentes y estudiantes del grado sexto. La triangulación de la información fue el método de análisis. Se encontró que los profesores dan relevancia a los temas relacionados con las distribuciones de frecuencia pero no a este, y le dedican poco tiempo a su orientación, los libros de texto abordan de manera aritmética el concepto de distribución de frecuencias y la enmarcan más en la concepción matemática

Epidemiology of intra-abdominal infection and sepsis in critically ill patients: “AbSeS”, a multinational observational cohort study and ESICM Trials Group Project

Purpose: To describe the epidemiology of intra-abdominal infection in an international cohort of ICU patients according to a new system that classifies cases according to setting of infection acquisition (community-acquired, early onset hospital-acquired, and late-onset hospital-acquired), anatomical disruption (absent or present with localized or diffuse peritonitis), and severity of disease expression (infection, sepsis, and septic shock). Methods: We performed a multicenter (n = 309), observational, epidemiological study including adult ICU patients diagnosed with intra-abdominal infection. Risk factors for mortality were assessed by logistic regression analysis. Results: The cohort included 2621 patients. Setting of infection acquisition was community-acquired in 31.6%, early onset hospital-acquired in 25%, and late-onset hospital-acquired in 43.4% of patients. Overall prevalence of antimicrobial resistance was 26.3% and difficult-to-treat resistant Gram-negative bacteria 4.3%, with great variation according to geographic region. No difference in prevalence of antimicrobial resistance was observed according to setting of infection acquisition. Overall mortality was 29.1%. Independent risk factors for mortality included late-onset hospital-acquired infection, diffuse peritonitis, sepsis, septic shock, older age, malnutrition, liver failure, congestive heart failure, antimicrobial resistance (either methicillin-resistant Staphylococcus aureus, vancomycin-resistant enterococci, extended-spectrum beta-lactamase-producing Gram-negative bacteria, or carbapenem-resistant Gram-negative bacteria) and source control failure evidenced by either the need for surgical revision or persistent inflammation. Conclusion: This multinational, heterogeneous cohort of ICU patients with intra-abdominal infection revealed that setting of infection acquisition, anatomical disruption, and severity of disease expression are disease-specific phenotypic characteristics associated with outcome, irrespective of the type of infection. Antimicrobial resistance is equally common in community-acquired as in hospital-acquired infection

Fatigue Damage Initiation in Waspaloy Under Complex Cyclic Loading

The low-cycle fatigue damage initiation in Waspaloy under complex cyclic loading (out-of-phas

The multilingual business handbook: a guide to international correspondence, 2nd ed

A multilingual glossary of commercial expressions for anyone needing to write or understand business communication in English, French, German, Spanish and Italian. Contents cover sales and distribution, agencies, customs, property - sales and rentals, hotel and travel reservations and many other subjects. Also included is vocabulary related to banking, post office, using the telephone and a list of common abreviations for each language. Each expression has a key letter and number enabling the user to quickly find the corresponding expression in any of the other languages. Each language section has its own index

Genetic gains for grain yield in high latitude spring wheat grown in Western Siberia in 1900-2008

Short season high latitude (50 degrees N-56 degrees N) spring wheat (Triticum aestivum L) is grown on approximately 7 million ha in Western Siberia with average yield of 1.5-2.0 t/ha. A historical set of 47 varieties developed and grown in the region between 1900 and 2000 was evaluated at a trial in Siberian Research Institute of Agriculture (Omsk) in 2002-2008. The genetic gains for grain yield and associated changes in agronomic traits were analyzed for three maturity groups (early, medium and late) and four breeding periods (before 1930, 1950-1975, 1976-1985 and after 1985). The overall yield was 3.71 t/ha for modern varieties versus 2.18 t/ha for old varieties representing 0.7% increase per year in the course of 100 years. The genetic gains between the breeding periods indicated that the rate of progress for the early and medium maturity groups was more or less comparable from one breeding period to the other. For the late maturity group there was an obvious and sharp decline in genetic gain with time. Modern varieties were also characterized by average response to environmental mean and good grain yield stability evaluated according to Eberhart and Russell (1966). Thousand kernel weight and number of grains per unit area were linearly correlated with grain yield and genetic gain over time suggested their importance for breeding progress. Resistance to leaf rust in some modern varieties sustained and contributed to stability of genetic gains. The yield increase over time was not associated with plant height reduction and incorporation of Rht genes. The maturity range of the newer varieties is narrower compared to old germplasm as they tend to belong to medium maturity group. Translocation 1B.1R had limited contribution to Western Siberian germplasm being observed in only three varieties. The increase in adaptation, yield potential and its stability has been reached due to gradual accumulation of favorable genes through diverse crosses, robust selection and testing system. Resistance to leaf rust and other prevalent pathogens is of paramount importance for future progress