Assessing the influence of the carbon oxidation-reduction state on organic pollutant biodegradation in algal-bacterial photobioreactors

The influence of the carbon oxidation-reduction state (CORS) of organic pollutants on their biodegradation in enclosed algal-bacterial photobioreactors was evaluated using a consortium of enriched wild-type methanotrophic bacteria and microalgae. Methane, methanol and glucose (with CORS -4, -2 and 0, respectively) were chosen as model organic pollutants. In the absence of external oxygen supply, microalgal photosynthesis was not capable of supporting a significant methane and methanol biodegradation due to their high oxygen demands per carbon unit, while glucose was fully oxidized by photosynthetic oxygenation. When bicarbonate was added, removal efficiencies of 37¿±¿4% (20 days), 65¿±¿4% (11 days) and 100% (2 days) were recorded for CH(4,) CH(3)OH and C(6)H(12)O(6), respectively due to the additional oxygen generated from photosynthetic bicarbonate assimilation. The use of NO(3)(-) instead of NH(4)(+) as nitrogen source (N oxidation-reduction state of +5 vs. -3) resulted in an increase in CH(4) degradation from 0 to 33¿±¿3% in the absence of bicarbonate and from 37¿±¿4% to 100% in the presence of bicarbonate, likely due to a decrease in the stoichiometric oxygen requirements and the higher photosynthetic oxygen production. Hypothetically, the CORS of the substrates might affect the CORS of the microalgal biomass composition (higher lipid content). However, the total lipid content of the algal-bacterial biomass was 19¿±¿7% in the absence and 16¿±¿2% in the presence of bicarbonat

Aplicación de Regresión Logística a la Calificación Crediticia de los Municipios del Estado de México, 2011 – 2015

El objetivo de esta investigación es conocer el impacto que juegan algunas de estas variables a lo que concierne a las calificaciones obtenidas por algunos municipios del Estado de México, durante el periodo 2011 a 2015. En particular, nos interesa estudiar el impacto que tiene los factores económicos y financieros de manera global, es decir, conocer el impacto que estos dos rubros tienen sobre la calificación final, expresado como porcentaje de ésta, y de manera particular, conocer el impacto de las variables que integran estos factores, así como la interacción entre ellas. Las agencias calificadoras enfatizan el hecho de que el análisis que realizan para otorgar una calificación crediticia es por naturaleza subjetivo y no puede reducirse a fórmulas matemáticas simples, tales como relaciones lineales entre variables, sin embargo, los estudios concernientes al tema muestran que el análisis formal de ciertas 5 variables puede ayudar a identificar relaciones explícitas entre un subconjunto de todas las variables analizadas y las calificaciones crediticias. Nuestra hipótesis de este trabajo es: las variables que se clasifican como financieras, económicas y deuda proporcionan información suficiente para la correcta predicción de la mayor parte de las calificaciones crediticias de los municipios del Estado de México que cuentan con esta, usando el modelo logístico ordenado. El objetivo principal de la siguiente investigación es aplicar la regresión logística ordinal y nominal a una base de datos, que contiene la calificación crediticia como variable de respuesta, y un conjunto de variables económicas y financieras como posibles predictores de las calificaciones crediticias de los municipios del Estado de México durante el periodo 2011 a 2015. Mientra

Penile ulceration caused by a foreign body reaction in a crew member on board a cruise ship

A crew member had a foreign body implanted subcutaneously on his dorsum penis stealthily 6 years earlier by a fellow crew member without any medical training. He presented to the ship’s medical centre after a week of pain, erythema and oedema over the foreign body, which was eventually removed by the patient, leaving behind a penile ulceration. He was treated conservatively initially with intravenous and then with oral antibiotics until complete secondary wound closure was achieved

Medevac from a cruise ship of a patient with spontaneous coronary artery dissection who presented with epigastralgia

Spontaneous coronary artery dissection (SCAD) is a rare cause of acute coronary syndrome that has been associated with peripartum and postpartum periods. It results from the separation of the layers of the arterial wall of the coronary artery with the subsequent formation of a false lumen. We report a case of a 54-year-old female who presented to the cruise ship’s medical facility complaining of epigastralgia and dizziness. Work up including an electrocardiography and cardiac profile was ordered. Results yielded a diagnosis of non-ST segment elevation myocardial infarction (NSTEMI). Treatment following American Heart Association recommendations including nitrates, clopidogrel and enoxaparin was given. After debarkation at sea and referral to a reference hospital, the patient was diagnosed with SCAD. Patient’s outcome was favorable and she was discharged home a few days after, despite being managed as a NSTEMI

A metaheuristic approach for the repositioning problem in bike sharing systems (bss): a study case in Toluca, México

The impact of Bike Sharing Systems (BSS) in the world had experienced such success that nowadays most iconic cities in the world have adopted its own system. The particular characteristics of the user’s mobility in every city have not allowed developing a generalized procedure to operate the systems. Moreover, the lack of symmetry in the mobility patterns, and the dynamic users’ behavior lead to eventually “unbalance” the system, this is, to a lack of bikes at stations, and therefore bikes have to be repositioned to stations where effective demand is present, and there is no unified or scientifically supported methodology. In this paper we deal with a study case in Toluca city (Huizi system), in which the entity in charge of current operational activities wants to design a procedure scientifically based to perform repositioning daily activities at the minimum operational cost guarantying the availability of bikes for the users (service level). Due to operational requirements, this bi-objective problem was formulated using a dynamic scope and stated as a combinatorial optimization model and finally solved using a multi-objective evolutionary algorithm

Nuevos contextos, nuevas denominaciones. Aportes de Robert Castel para mirar la nueva cuestión social centrada en el trabajo y el trabajador

Robert Castel (2006) identifica para la década de 1830 la fecha en la cual se comenzó a hablar de la cuestión social como tal. Esta era entendida como una aporía fundamental en la cual una sociedad experimenta el enigma de su cohesión y trata de conjurar el riesgo de su fractura. Es un desafío que interroga, pone de nuevo en cuestión la capacidad de una sociedad (lo que en términos políticos se denomina una nación) para existir como un conjunto vinculado por relaciones de interdependencia?. Nos proponemos analizar dicho concepto enmarcado en el contexto de la economía social, específicamente en el fenómeno de empresas recuperadas por los trabajadores mediante cooperativas.Fil: Rosa, Paula Cecilia. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Saavedra 15. Centro de Estudios Urbanos y Regionales; ArgentinaFil: Toscani, María de la Paz. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Saavedra 15. Centro de Estudios Urbanos y Regionales; ArgentinaFil: Garcia, Liliana Ines. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Saavedra 15. Centro de Estudios Urbanos y Regionales; Argentin

Estructuración de plan para disminuir fuga de talentos en una empresa del sector Industrial

El presente caso tiene como objetivo estructurar un plan que reduzca la fuga de talentos dentro de una empresa del sector industrial. El problema radica porque es una situación que actualmente está causando complejidad al momento de sustituir a aquellos colaboradores con amplia experiencia y conocimientos que deciden abandonar la organización, es una realidad que enfrentan las empresas dedicadas al rubro industrial en donde la mayoría de colaboradores tienen formación técnica y comercial. Encontrar ese mix de habilidades en el mercado es complejo por lo cual es vital que la empresa cuide esos talentos calificados contando con un plan que permita ofrecer condiciones motivantes para que permanezcan en la organización. Se emplearon métodos empíricos, inicialmente se realizó un instrumento para entrevistar pero finalmente se optó por elaborar una encuesta que permita recopilar los datos que los colaboradores consideran motivantes para preservar su continuidad en la organización. Con esta información se pretende contar con los datos necesarios para estructurar un plan enfocado a cada talento potencial. Este plan será de gran utilidad no solo para organizaciones del sector industrial sino de cualquier rubro porque al conocer las expectativas de aquellas personas cuya gestión contribuye significativamente al crecimiento del negocio se reducirá el índice de rotación de personal, el cual al momento ha tenido un incremento considerable.This case aims to structure a plan to reduce the brain drain within an industrial company. The problem is because it is a situation that is currently causing complexity when replace those employees with extensive experience and knowledge who decide to leave the organization, it is a reality that companies engaged in the industrial sector where most employees have technical training face and commercial. Finding that mix of skills in the market is complex so it is vital that the company take care of those talents qualified having a plan to offer motivating conditions to remain in the organization. Empirical methods were used, initially an instrument was made to interview but eventually chose to develop a survey to collect data that employees consider motivating to preserve continuity in the organization. With this information is intended to have the necessary data to structure a focused plan every potential talent. This plan will be useful not only for industry organizations but any category because knowing the expectations of those whose management contributes significantly to business growth rate of staff turnover, which at the time had a considerable increase will be reduced

Vigas de pino silvestre sometidas a flexión : influencia de defectos y singularidades = Wild pine beams subjected to bending : influence of defects and singularities

This paper presents an experimental study of the behavior of 18 timber beams for structural use of 155x75x1090mm dimensions. The origin of the wood is Valsaín sawmill. The tests were performed at the Laboratory of Construction Materials at the University School of Technical Architecture. The objective of this work is the analysis of flexural behavior of test pieces according to the defects and singularities, carrying out an analysis of their influence. 18 pieces have been tested, of which 9 were placed in a flat position, and the other 9 were placed in edge position. Before testing, the samples were classified according to UNE 56544 visual grading of sawn timber for structural use, determining the structural quality of each piece and the strength class. Singularities and defects found in each one of the pieces, moisture, weight and dimensions are measured and identified. The results of the analysis are presented in the conclusions, comparing the test data with the characteristics of the beams, determining the influence of the presence of defects and the characteristics of the timber beams with resistance in tests

A Coronal Jet Ejects from Sunspot Light Bridge

Chromospheric brighten and H$\alpha$ surge are the evident and common phenomena along sunspot light bridge. In this paper, a coronal jet ejects from sunspot light bridge is presented. Using the data from the Solar Dynamics Observatory (SDO) and Hinode satellites, it is confirmed that the jet has the root near light bridge, this suggests that the jet may be a result of reconnection between main sunspot and light bridge. Due to the processing of jet ejects, the intensity and width of light bridge have some changes at some extent. This also suggests that jet is related to the interaction between light bridge and umbra, possibly magnetic reconnection or heat plasma trapped in light bridge escaping and moving along field line.Comment: It has been accepted for publication in PAS