Characteristics of Staphylococcus aureus infections to consider in designing an effective vaccine.

_Staphylococcus aureus_ is a very versatile and adaptable microorganism. It can potentially infect virtually any host tissue. Given the appropriate conditions it can become a life-threatening pathogen, or a commensal colonizer of the nose. Extensive antibiotic use for infection control facilitated the rise of antibiotic resistance, stressing the need for alternate forms of control. Vaccine efforts in other pathogens have proved successful, but so far _S. aureus_ candidate vaccines have not been as effective. Here we review _S. aureus_ factors involved in pathogenesis that could help develop a successful vaccine, like host nasal colonization and immune evasion factors. An effective multicomponent vaccine could incorporate antigenic fragments from several _S. aureus_ proteins, preferably involved in colonization, immune evasion and/or toxicity

Autonomous Satellite Recovery Vehicle (ASRV) Final Report

In collaboration with Embry-Riddle Future Space Explorers and Developers Society (ERFSEDS), we came up with the idea to build a quad-copter/sensor system that could be deployed from a rocket. The goal is to build a new chassis for the quad-copters electronic components that will allow the quad-copters arms to fold inwards to meet the required space constraints of a rocket. In addition to the critical components of the quad-copter, our design will integrate a number of other data collecting sub-systems currently being used in a weather balloon designed by Society 4 S.P.A.C.E. club members. After being jettisoned from the rocket, the sensor systems objective would be to collect atmospheric data as it descends. At the altitude of 2,000 feet the quad-copter would be programmed to deploy a parachute. Once it has reached a safe velocity the arms would extend, motors engage, and the quad would autonomously navigate to a prearranged location. Flight planning will be done using a preexisting flight planning application. Data gathered from the sensors will include pressure, temperature, humidity, wind, and video. This project will give us a better understanding of rocket propulsion systems and the effect of launch on the payload. It will also allow us to gain valuable research, data retrieval, team development and multi-club collaboration experience

Atmospheric Weather Balloon for Near Space Research

Abstract The Society 4 S.P.A.C.E. Club at Embry-Riddle has been working on the development of a weather balloon that will reach a height of 80 to 100 thousand feet and collect data from the atmosphere. The weather balloon is attached to a Styrofoam box that contains an Arduino board controlling a set of sensors that will measure: temperature, humidity, atmospheric pressure, wind speed and direction. All the data collected will be transmitted with a XBEE antenna to the ground station. A capsule of compressed CO2 will be used to eject a parachute once the free falling Styrofoam box has reached an altitude of 1,000 feet. The Styrofoam box will be retrieved using GPS data, and once refurbished it will be fully reusable

Obtención de la fórmula de la Variancia del Estadístico de la Dócima de rangos de Wilcoxon-Mann-Whitney

En este artículo se deriva la fórmula de , en donde es el estadístico de la dócima de Wilcoxon-Mann-Whitney, para probar la hipótesis de igualdad de las distribuciones de dos poblaciones. El propósito es brindar detalles del tipo de pruebas propias de la Estadística No Paramétricas que a menudo son omitidos en los libros de texto especializados. El fundamento principal del procedimiento que se ofrece para derivar la fórmula, es el hecho de que bajo la hipótesis de igualdad de las distribuciones, los rangos , la muestra de una de las dos poblaciones constituye una muestra simple al azar sin reemplazo del conjunto de rangos en donde y son los tamaños de las dos muestras independientes obtenidas

El auditor interno y su independencia

El estudio realizado tuvo como objetivo general, el analizar la independencia del auditor, debido a que su contratación depende de lo que disponga el representante legal de la compañía que auditan. El soporte que se tuvo para este análisis fue con base en lo observado en la ley 87 de 1993 y otros artículos de internet donde se relaciona ejemplos de fraudes que ponen en tela de juicio la confianza del auditor. La metodología utilizada es sencilla entendible, donde resulta argumentando las posibles soluciones de contratación que facilita la imparcialidad de los auditores en los dictámenes e informes que emiten. Para la recopilación de la información se utilizó el Internet como herramienta de investigación y consulta, facilitando de esta manera un enfoque argumentativo al ensayo

Engineering Physics Propulsion Lab Thruster Test Stand - TTS

The Engineering Physics Propulsion Laboratory (EPPL) student team lead by Dr. Sergey Drakunov and Dr. Patrick Currier, has been working on the design, development, and construction of a Thruster Test Stand (TTS) in the College of Arts and Science. The TTS is a tool developed for a NASA STTR Phase II project titled “The World is Not Enough (WINE): Harvesting Local Resources for Eternal Exploration of Space” currently conducted in EPPL. This is a joint project of Honeybee Robotics, ERAU and UCF. It will allow the EPPL student team to measure the thrust, temperature, pressure, exhausted velocity, frequencies, and electrical loads on any kind of propulsion unit. Currently, cold gas propulsion is being tested with plans to develop and test a steam-based and chemical-based propulsion system. Current and future research to be conducted in optimizing the design parameters and conduct practical tests of the thrusters are being pursued at the University from several different departments, including the COAS, the COA, & the COE. The TTS is designed to be modular towards many different propulsion systems. The modularity on the design will allow all students involved in research related to propulsion and control thrusters to utilize the test stand and gather data on their projects. The TTS frame components are design to increase the stability and rigidity to minimize noise and unwanted natural frequencies on the readings

Economía social para el desarrollo humano en México y España 2020

"La presente investigación retoma las prácticas y características sobre el desarrollo humano y la economía social con las que cuenta México y España, generando un análisis para proponer a una de las entidades de la economía social como impulsora del desarrollo humano. Se inicia presentando la situación sociopolítica de ambas naciones, brindando un contexto general de los territorios. En el segundo capítulo se aborda al desarrollo humano, desde la perspectiva propuesta por el Programa de las Naciones Unidas para el Desarrollo (PNUD) y para ambas naciones, considerándolo como un concepto integral y en continua construcción, del cual, se retoma a la educación, la salud y el trabajo/ingreso como indicadores a impulsar por la economía social. El tercer capítulo aborda el concepto de economía social y cómo se ha desarrollado tanto en México como en España. Se realizan diversos análisis en la materia hasta llegar a determinar la entidad idónea de la economía social que impulse al desarrollo humano. El cuarto capítulo genera un análisis que propone a las cooperativas como entidades que impulsan al desarrollo humano, desde su funcionamiento, por los servicios que pueden brindar a la sociedad y por compartir diversas características y directrices"

From Polyethylene to Highly Graphitic and Magnetic Carbon Spheres Nanocomposites: Carbonization under Pressure

Carbon nanocomposites microspheres were synthesized from Low-Density Polyethylene (LDPE) by a facile one-step strategy under solvent-free conditions. The synthesis of these materials was carried out in a closed Hastelloy® reactor at 700 ºC. The treatment, during which autogenic pressure was generated, leads to highly graphitic materials with stunning properties, particularly concerning the oxidation resistance (compared to the graphite stability). The metallic doping triggers the growth of nanostructures with diverse morphologies around the spheres, obtaining samples with magnetic properties.This research is supported by the project P12-RNM-2892 and RMN-172 (Junta de Andalucía, Spain)