Could people with stereo-deficiencies have a rich 3D experience using HMDs?

People with stereo-deficiencies usually have problems for the perception of depth using stereo devices. This paper presents a study that involves participants who did not have stereopsis and participants who had stereopsis. The two groups of participants were exposed to a maze navigation task in a 3D environment in two conditions, using a HMD and a large stereo screen. Fifty-nine adults participated in our study. From the results, there were no statistically significant differences for the performance on the task between the participants with stereopsis and those without stereopsis. We found statistically significant differences between the two conditions in favor of the HMD for the two groups of participants. The participants who did not have stereopsis and could not perceive 3D when looking at the Lang 1 Stereotest did have the illusion of depth perception using the HMD. The study suggests that for the people who did not have stereopsis, the head tracking largely influences the 3D experience

Combined use of vacuum assisted device and dermal monolayer substitutes

Artículo previamente publicado en Cirugia Plástica Iberolatinoamericana Vol. 36 - Nº 4. 2010 / Pag. 321-326El método de elección para la cobertura de algunos defectos cutáneos es el autoinjerto de piel parcial; sin embargo, sufre retracciones que pueden adquirir gran relevancia sobre áreas especiales. Diferentes autores han intentado evitar estos déficits funcionales mediante la interposición de matrices de regeneración dérmica monocapa e injerto en un solo tiempo quirúrgico. Diseñamos un estudio para comparar la tasa de integración de los injertos sobre una matriz monocapa con y sin la aplicación de terapia de vacío tipo VAC® sobre ellos. Se aleatorizaron 20 pacientes con defectos cutáneos sobre áreas especiales en 2 grupos. Recogimos los datos epidemiológicos y la etiología del defecto (quemadura aguda, secuelas de quemadura o defectos secundarios a extracción de colgajo fasciocutáneo). En 10 casos (Grupo I) se aplicó matriz dérmica monocapa Matriderm ® más un injerto cutáneo de piel parcial, realizando un cambio de vendaje a los 7 días y luego cada 3- 4 días hasta su estabilización. En otros 10 pacientes (Grupo II), tras realizar el mismo protocolo quirúrgico se aplicó VAC ® durante una semana y se cambió hasta la estabilización del injerto. La evaluación del prendimiento del injerto y su estabilidad la realizó un observador ciego. Se recogieron todas las complicaciones surgidas en el postoperatorio hasta 3 meses después de la estabilidad del injerto. Comprobamos la homogeneidad de ambos grupos para las variables epidemiológicas de los pacientes, así como para la etiología de los defectos. La media de tiempo hasta el prendimiento fue de 17,6 ± 8 días, de forma global con una tasa de complicaciones del 20%. Al estratificar en 2 grupos encontramos que las diferencias en la tasa de complicaciones no eran estadísticamente significativas. El tiempo hasta el prendimiento era de 21,4 ± 9 días en el grupo I, frente a 13,9 ± 4 días en el grupo II. Estas diferencias sí eran estadísticamente significativas. Como conclusión, la aplicación de matrices de regeneración dérmica monocapa es segura, con una tasa de prendimiento de los injertos sobre ella del 85%. El uso del VAC ® sobre las láminas monocapa de dermis sintética acorta el tiempo de integración de las mismas y el prendimiento de los injertos sobre ellas, con una tasa de complicaciones similarSplit thickness autografts are the gold standard for wound coverage. However, scars and retractions are frequent after skin grafts, and would be severe over special regions. Different authors avoid these complications using a dermal substitute interposed between the wound and the skin graft in the first surgical time. A prospective study was designed to evaluate the split thickness skin graft uptake time over a monolayer matrix, with and without a vacuum assisted therapy device (VAC®). Twenty patients with a full thickness wound over a special region were randomized between 2 groups. Epidemiological data and wound etiology (acute burn, burn sequelae or donor site after a fasciocutaneous flap raised) were collected. Matriderm ® (mono layer dermal substitute) and a split thickness skin graft was applied over 10 cases (Group I). The dressing was changed after 7 days, and every 3-4 days until the skin graft was uptake and stable. Another 10 cases were treated with the same surgical strategy (Group II). After surgery, a vacuum assisted therapy device (VAC®) was applied until the graft was uptake. The skin graft evaluation was done by a blind observer. All complications were reported until 3 months after the skin graft was stable. The homogeneity between groups was assessed. Averaged uptake time was 17, 6 ± 8 days, and the total complication rate was 20%. Statistically differences were not found between the 2 groups for the complication rate. The uptake time was 21,4 ± 9 days in the Group I and 13,9 ± 4 days in the Group II. These differences was statically significative. As a conclusion, the use of monolayer dermal substitutes is safe, with skin graft uptake rate of 85%. Time for skin graft uptake over a monolayer dermal matrix is shorter using a VAC ® device over the skin graft, with similar complication rat

Estudio histomorfométrico del hueso diafísario en la rata

Se ha realizado un estudio histomorfométrico de la diálisis femoral en la rata blanca cepa «Wistar» calculando las dimensiones del endostio y periostio, así como las modificaciones de las áreas de la corteza, cavidad medular y hueso total en relación a la actividad endóstica y perióstica del hueso durante el primer año de vida. Los resultados demuestran un crecimiento discontinuo con una fase de enlentecimiento entre los 25 y 45 días de vida. La evolución de los cambios diafisarios en la rata es superponible a la del hombre, considerándola un animal de experimentación válido para estudiar los fenómenos de remodelación ósea durante el crecimiento.A histomophometric study of the femoral diaphyseal bone was undertaken in «Wistar» albine rat. Measurements of the endosteal and periosteal thickness as weel as variations in cortical, medular and total bone areas in relation to the endosteal and periosteal bone activity during the first year of life were analyzed. The results showed a continuous growth increase with a phase of lower growth rate from the 25th to the 45th day of life. The pattern of diaphyseal growing changes resembled that found in humans. The rat can therefore be considered as a suitable experimental animal for the study of bone remodeling during growth

Anatomical dissection of the mimic facial musculature: iconographic review as a support to the complementary treatments in facial rejuvenation

A la hora de valorar las múltiples técnicas empleadas en el rejuvenecimiento facial y centrándonos de manera particular en aquellos procedimientos mínimamente invasivos complementarios a las intervenciones habituales en Cirugía Plástica-Estética, cobra especial relevancia el conocimiento exhaustivo de las estructuras musculares implicadas en la mímica facial. A tal efecto, se ha realizado un estudio anatómico en cadáveres frescos, en los que se han disecado las principales estructuras referidas. Se presenta un resumen iconográfico de los músculos faciales implicados, haciendo hincapié en su anatomía descriptiva y funcional, así como un recuerdo de las principales áreas problemáticas por alguna circunstancia especial (presencia de un nervio sensitivo o motor).To value the multiple technologies involved in facial rejuvenation and focusing in those minimally invasive complementary procedures to the usual Plastic and Aesthetic Surgeries, it´s very important the exhaustive knowledge of the muscular structures involved in the facial movements. To such an effect, an anatomical study has been realized in fresh corpses, dissecting the principal above-mentioned structures. We present an iconographic summary of the facial implied muscles, emphasizing in his descriptive and functional anatomy, as well as a recollection of the principal problematic areas for some special circumstance (presence of a sensory or motor nerv

Silk fibroin based magnetic nanocomposites for actuator applications

The need for technologies based environmentally friendlier materials, able to minimize the global dependence on fossil fuel derivatives, promotes the development of new hybrid materials based on natural polymers, such as silk derivatives. This work reports on a new generation of magnetically active materials based on silk fibroin (SF) from Bombyx mori silkworm. Magnetic cobalt ferrite (CFO) nanoparticles are introduced in an SF polymer matrix to develop CFO/SF nanocomposites with filler contents of up to 20 wt%. It is shown that the inclusion of CFO nanoparticles affects the β‐sheet conformation of SF polymer having relevant effect on mechanical and thermal properties. The incorporation of conductive nanoparticles into nonconductive matrix, induces an increase in electric conductivity and also in dielectric constant. The primitive magnetic behavior of CFO nanoparticles is successfully maintained after their incorporation into SF, which has made possible the processing of magnetic SF. These results enable the design and fabrication of a fully functional magnetic actuator based on SF, proving the suitable natural polymer‐based magnetic materials for a new generation of environmental‐friendlier smart and multifunctional materialsFundação para a Ciência e Tecnologia. Grant Numbers: UID/FIS/04650/2019, UID/EEA/04436/2019, UID/QUI/0686/2019, PTDC/FIS-MAC/28157/2017, PTDC/BTM-MAT/28237/2017, SFRH/BD/131729/2017, SFRH/BPD/112547/2015 Spanish Ministry of Economy and Competitiveness. Grant Number: MAT2016-76039- C4-3-R Basque Government Industry and Education Departments. Grant Number: PIBA- 2018-0

Analyzing the negative effects of motivating e-learning tools in archeology teaching

[EN] In this article we study the negative effects of applying motivating e-Learning tools as a method to increase students’ engagement through their learning process. In particular, we demonstrate that increasing students’ motivation can have a negative effect on students’ efficiency if they engage with the applications in a wrong way. In our carried out experience, we have used a virtual reconstruction of the TT 209 archeological site in Luxor. This application allows students to move inside and outside the site and get some information on the different activities that were done along the field work. We have found that students tend to use the application just as a game. This fact decreases students’ efficiency since they do not pay enough attention to the learning activities inside the system. To avoid this effect, we propose to use gamification strategies such as rewards to redirect students’ attention to the learning process

Acrylonitrile butadiene styrene-based composites with permalloy with tailored magnetic response

This work reports on tailoring the magnetic properties of acrylonitrile butadiene styrene (ABS)-based composites for their application in magnetoactive systems, such as magnetic sensors and actuators. The magnetic properties of the composites are provided by the inclusion of varying permalloy (Py—Ni75Fe20Mo5) nanoparticle content within the ABS matrix. Composites with Py nanoparticle content up to 80 wt% were prepared and their morphological, mechanical, thermal, dielectric and magnetic properties were evaluated. It was found that ABS shows the capability to include high loads of the filler without negatively influencing its thermal and mechanical properties. In fact, the thermal properties of the ABS matrix are basically unaltered with the inclusion of the Py nanoparticles, with the glass transition temperatures of pristine ABS and its composites remaining around 105 °C. The mechanical properties of the composites depend on filler content, with the Young’s modulus ranging from 1.16 GPa for the pristine ABS up to 1.98 GPa for the sample with 60 wt% filler content. Regarding the magnetic properties, the saturation magnetization of the composites increased linearly with increasing Py content up to a value of 50.9 emu/g for the samples with 80 wt% of Py content. A numerical model has been developed to support the findings about the magnetic behavior of the NP within the ABS. Overall, the slight improvement in the mechanical properties and the magnetic properties provides the ABS composites new possibilities for applications in magnetoactive systems, including magnetic sensors, actuators and magnetic field shielding.This project was supported by the PID program CDTI (EXP-00131900/IDI-20210369). Funding is from the Basque Government Industry Department under the ELKARTEK program. Support was received from the Portuguese Fundação para a Ciência e Tecnologia, grant SFRH/BPD/110914/2015

El consumo de probiótico Lactobacillus plantarum CECT 7315/7316 mejora el estado de salud general en personas de edad avanzada

Fundamentos: Con la edad avanzada se producen cambios en la microflora intestinal que pueden afectar al estado de salud general. En este trabajo analizamos el efecto de Lactobacillus plantarum CECT 7315/7316 sobre la regulación del tránsito intestinal y el estado nutricional. Métodos: Hemos realizado un estudio clínico dobleciego, controlado por placebo y aleatorizado. Hemos evaluado la evolución de la frecuencia de defecación semanal y los niveles en sangre de proteínas totales, albúmina,colesterol y proteína C-reactiva. Resultados: Lactobacillus plantarum CECT 7315/7316 ayuda a regular el tránsito intestinal y mejora el estado nutricional en personas mayores. Conclusiones: El consumo de productos funcionales que contengan L. plantarum CECT 7315/7316 mejora la calidad de vida de personas de la tercera edad

Agricultural policies against invasive species generate contrasting outcomes for climate change mitigation and biodiversity conservation

Direct consequences of biological invasions on biodiversity and the environment have been largely documented. Yet collateral indirect effects mediated by changes in agri-environmental policies aimed at combating invasions remain little explored. Here we assessed the effects of recent changes in water management in rice farming, which are aimed at buffering the impact of the invasive apple snail (Pomacea maculata, Lamarck) on greenhouse gas emissions and diversity of waterbird communities. We used observational data from a 2-year field monitoring (2015–2016) performed at the Ebro Delta regional scale. We found that drying rice fields reduced methane emission rates by 82% (2015) and 51% (2016), thereby reducing the contribution of rice farming to climate change. However, there was a marked reduction (75% in 2015 and 57% in 2016) in waterbird diversity in dry fields compared with flooded fields, thus suggesting that post-invasion policies might hinder biodiversity conservation. Our results highlight the need for accounting for potential collateral effects during the policy decision-making process to design efficient agricultural management plans that lessen undesirable agri-environmental outcomes.info:eu-repo/semantics/acceptedVersio

Morfología ovárica y foliculogénesis en Gymnotus carapo (Linnaeus, 1758)

El objetivo del presente trabajo fue el estudio de la morfología ovárica y la foliculogénesis de Gymnotus carapo, a fin de aportar información sobre su biología reproductiva, y que ésta sea de utilidad en el manejo de dicha especie como recurso pesquero. Se recolectaron 40 ejemplares hembras durante el periodo de febrero a diciembre del 2019 en ambientes naturales próximos a la Ciudad de Corrientes. Posteriormente a la captura fueron anestesiados con solución de lidocaína al 2% y sacrificados por sección medular. Los ovarios fueron aislados y fijados en formol al 10%; posteriormente fueron procesados para la técnica histológica convencional y coloreados con hematoxilina-eosina (H-E), tricrómica de Gomori y reacción histoquímica de PAS. Los preparados histológicos fueron analizados a través del microscopio óptico. Se pudo observar que la foliculogénesis en G. carapo es similar a la descrita para otros peces. El ovario y los ovocitos de G. carapo experimentan diferentes etapas de desarrollo: crecimiento primario, secundario, vitelogénesis y maduración durante el ciclo reproductivo, información que sienta base para estudios futuros sobre biología reproductiva. La información brindada en el presente trabajo es importante dado que aporta un estudio histológico detallado que describe la morfología ovárica y foliculogénesis en G. carapo y contribuye a la gestión y planificación de conservación de especies de importancia para el recurso pesquero