Alteraciones morfológicas en riñones de ratas sometidos a isquemia reperfusión

Fundamento: La isquemia reperfusión renal es un proceso en donde se involucra una serie de eventos que pueden conducir al daño y muerte celular. Objetivo: Determinar las modificaciones morfológicas que se producen en el riñón a medida que progresa el tiempo en el proceso de isquemia reperfusión. Métodos: Se utilizó como muestra un grupo de 35 ratas Wistar, machos, que fueron divididos en cinco grupos de siete ratas cada uno. Al subgrupo que no se le provocó isquemia se le denominó control (C) y al resto se les nombró experimentales (E). El subgrupo experimental E- I fue sometido a 15 minutos de isquemia, el E-II a 30 minutos, el E-III a 45 minutos y el E-IV a una hora. Luego se tomaron muestras de tejido renal para estudio morfométrico. Resultados: Se produjo una reducción significativa del número de glomérulos y de la fracción de área ocupada por estos tras isquemia reperfusión temporal de 15 minutos (EI), la que parece ser reversible por la ligera mejoría observada tras 30 minutos (EII) a partir del cual sigue recayendo hasta después de una hora de isquemia reperfusión (EIV). Conclusiones: La combinación de isquemia con reperfusión supera el tiempo crítico para provocar lesión irreversible celular del tejido renal

Sexuality throughout all the stages of pregnancy: experiences of expectant mothers

Objective: To explore and understand the sexual experiences of expectant mothers during their pregnancy. Methods: The study was carried out in two healthcare centers in the Almería Health District, in southern Spain. The participants included pregnant women who received prenatal care and/or maternity education. The inclusion criteria were being pregnant, maintaining sexual activity and agreeing to participate in the study. The exclusion criteria were having limitations on sexual activity by medical prescription. The sample consisted of 15 expectant women selected using a convenience sample, of which 5 took part in a focus group (FG) and 10 in in-depth interviews (IDI). Data was collected between the months of June and December 2016. Participants were contacted by the main researcher and an appointment was made to carry out the FGs or the IDIs. Results: Three main categories emerged: False beliefs and a holistic approach to sexuality during pregnancy, which is related to the concept of sexuality, false beliefs, and limited sexual counseling during pregnancy. Limitations: From fear at the beginning to physical diffi culty at the end, referring to the fluctuations in sexual desire as well as the physical changes that limit sexual activity. Adapting to changes: safe practices and satisfaction with one’s body image, which encompasses concerns about the risks and the relationship between body image and self-esteem. Conclusion: A lack of sexual counseling during pregnancy leads to the creation of false beliefs, which, together with physical changes, concerns about the risk, and fl uctuations in sexual desire and interest, bring about a decrease in sexual activity. But sexuality remains an important aspect of pregnancy, toward which the participants must adopt a broader approach, not limited to intercourse, and adopt sexual practices that are adapted to the physical and emotional changes that happen during this time

Chitosan-Gold Nanoparticle Composites for Biomedical Application

The aim of this work is to synthesize chitosan-gold nanoparticles films by direct chemical reduction of HAuCl4 in a chitosan solution and to investigate the influence of gold nanoparticles concentration on the structure of films, conductivity and healing effect on mice skin after surgery. Results obtained have shown that new chitosan-gold nanoparticle-collagen bionananocomposites demonstrated better healing effect on the mice skin after surgery than control performed on commercial TheraFormTM material. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3540

Fuzzy PD+I Embedded Control System for a Multi-Phase DC-DC Bidirectional Converter

[EN] In this work is presented the design of a Fuzzy PD+I control system applied to the voltage control of a multi-phase DC-DC power electronic converter. The fuzzy controller has two inputs. The first input, named Error, is the difference between the desired voltage value in the output of the converter and the measured voltage at this particular point; the second input is defined by the changes in the measured voltage of the converter. The control system is embedded in the NI myRIO-1900 development kit, using LabVIEW as programming software employing the embedded system for experimental tests with a prototype of the converter. This control system allows the stabilization of the converter in the buck and boost operation modes, showing an appropriate behavior at the startup and under resistive load changes, presenting acceptable times for DC microgrids future applications while connecting the DC bus with supercapacitors or a battery bank.[ES] En este trabajo se presenta el diseño de un sistema de control difuso PD+I embebido aplicado en el control de voltaje de un convertidor electrónico de potencia bidireccional multi-fase CD-CD. El controlador difuso cuenta con dos entradas, la primera se le denomina Error y es la diferencia entre el valor de voltaje deseado en la salida del convertidor y el voltaje medido en la salida del mismo; la segunda entrada es definida por las variaciones en el voltaje medido. La salida del controlador difuso define las variaciones en el ciclo de trabajo de los interruptores de potencia que controlan el convertidor. El sistema de control difuso se embebió en la tarjeta de desarrollo NI myRIO-1900 utilizando como software de programación LabVIEW, empleando el sistema embebido para realizar pruebas experimentales con el prototipo del convertidor. Con este sistema de control de voltaje se logra estabilizar el convertidor en los modos de operación reductor y elevador, demostrando un adecuado comportamiento del convertidor en el arranque y ante cambios de carga resistiva, manteniendo tiempos aceptables para aplicaciones futuras en micro-redes de CD conectando el bus de CD con un banco de super-capacitores o un banco de baterías.Martínez Nolasco, JJ.; Rodríguez, E.; Rodríguez, H.; Morfin, J.; Padilla, A. (2018). Fuzzy PD+I Embedded Control System for a Multi-Phase DC-DC Bidirectional Converter. Revista Iberoamericana de Automática e Informática industrial. 15(4):457-466. https://doi.org/10.4995/riai.2018.8721OJS457466154Baek J. B., Choi, W. I., Cho, B. H., 2013. Digital adaptive frequency modulation for bidirectional DC-DC converter. IEEE Transactions on Industrial Electronics, 60(11), 5167-5176. DOI: 10.1109/TIE.2012.2224075Bolognani S., Morandin M., Calligaro S., Petrella R., Pevere A., 2014. Bidirectional PMSM drive employing a three level ANPC inverter and a multi-phase interleaved DC/DC converter for hybrid electric vehicles. Twenty-Ninth Annual IEEE in Applied Power Electronics Conference and Exposition (APEC), IEEE, 818-825. DOI: 10.1109/APEC.2014.6803402Brox M., Sánchez S., del Toro E., Brox P., Moreno F. J., 2013. CAD tools for hardware implementation of embedded fuzzy systems on FPGAs. IEEE Transactions on Industrial Informatics, 9(3), 1635-1644. DOI: 10.1109/TII.2012.2228871Burrett R., Clini C., Dixon R., Eckhart M., El-Ashry M., Gupta D., Houssin D., 2009. Renewable Energy Policy Network for the 21st Century.Dusmez S., Hasanzadeh A., Khaligh A., 2015. Comparative analysis of bidirectional three-level DC-DC converter for automotive applications. IEEE Transactions on Industrial Electronics, 62(5), 3305-3315. DOI: 10.1109/TIE.2014.2336605Hart D., 2011. Power Electronics, 1ra ed., McGraw-Hill, New York. 198-220.Hegazy O., Van Mierlo J., Lataire P., 2011. Design and control of bidirectional DC/AC and DC/DC converters for plug-in hybrid electric vehicles. International Conference in Power Engineering, Energy and Electrical Drives (POWERENG), IEEE, 1-7. DOI: 10.1109/PowerEng.2011.6036530Hossain M. I., Khan S. A., Shafiullah M., Hossain M. J. 2011. Design and implementation of MPPT controlled grid connected photovoltaic system. Symposium in Computers & Informatics (ISCI), IEEE, 284-289. DOI: 10.1109/ISCI.2011.5958928Khan S. A., Hossain M. I., 2010. Design and implementation of microcontroller based fuzzy logic control for maximum power point tracking of a photovoltaic system. International Conference in Electrical and Computer Engineering (ICECE), IEEE, 322-325. DOI: 10.1109/ICELCE.2010.5700693Kumar A., Gaur P., 2014. Bidirectional DC/DC converter for hybrid electric vehicle. International Conference in Advances in Computing, Communications and Informatics (ICACCI), IEEE, 839-843. DOI: 10.1109/ICACCI.2014.6968295Lee S. Y., Pfaelzer A. G., van Wyk, J. D., 2004. Thermal analysis for improved packaging of 4-channel 42 V/14 V DC/DC converter. 39th IAS Annual Meeting in Industry Applications Conference Vol. 4, IEEE, 2330-2336. DOI: 10.1109/IAS.2004.1348800Lee S. Y., Pfaelzer A. G., van Wyk J. D., 2007. Comparison of different designs of a 42-V/14-V dc/dc converter regarding losses and thermal aspects. IEEE Transactions on Industry Applications, 43(2), 520-530. DOI: 10.1109/TIA.2006.889808Liu D., Hu A., Wang G., Hu W., 2010. Current sharing schemes for multiphase interleaved DC/DC converter with FPGA implementation. International Conference in Electrical and Control Engineering (ICECE), IEEE, 3512-3515. DOI: 10.1109/iCECE.2010.854Markvart T., 2006. Microgrids: Power systems for the 21st century. Refocus, 7(4), 44-48.Martínez, J. J., Padilla-Medina, J. A., Cano-Andrade, S., Sancen, A., Prado, J., & Barranco, A. I. (2018). Development and Application of a Fuzzy Control System for a Lead-Acid Battery Bank Connected to a DC Microgrid. International Journal of Photoenergy, 2018.Omara A. M., Sleptsov M. A., 2016. Comparative study of different electric propulsion system configurations based on IPMSM drive for battery electric vehicles. International Conference in Electrical Machines and Systems (ICEMS), IEEE, 1-6.Sánchez S., Cabrera A., Baturone M. I., Moreno F. J., Brox M., 2007. FPGA implementation of embedded fuzzy controllers for robotic applications. IEEE Transactions on Industrial Electronics, 54(4), 1937-1945. DOI: http://dx.doi.org/10.1109/TIE.2007.898292Santos M., 2011. Un enfoque aplicado del control inteligente. Revista Iberoamericana de Automática e Informática Industrial RIAI, 8(4), 283-296. DOI: 10.1016/j.riai.2011.09.016Sikkabut S., Mungporn P., Ekkaravarodome C., Bizon N., Tricoli P., Nahid-Mobarakeh B., Thounthong P., 2016. Control of High-Energy High-Power Densities Storage Devices by Li-ion Battery and Supercapacitor for Fuel Cell/Photovoltaic Hybrid Power Plant for Autonomous System Applications. IEEE Transactions on Industry Applications, 52(5), 4395-4407. DOI: 10.1109/TIA.2016.2581138Thao N. G. M., Dat M. T., Binh T. C., Phuc N. H., 2010. PID-fuzzy logic hybrid controller for grid-connected photovoltaic inverters. International Forum in Strategic Technology (IFOST), IEEE, 140-144. DOI: 10.1109/IFOST.2010.5668024Vanti V. M., Leite L. C., Batista E. A., 2015. Monitoring and control of the processes involved in the capture and filtering of biogas using FPGA embedded fuzzy logic. IEEE Latin America Transactions, 13(7), 2232-2238. DOI: 10.1109/TLA.2015.7273782Yang Y., Li T., Liu J., Li H., 2012. A comprehensive analysis of coupled inductors in 4 phases interleaving bidirectional DC/DC converter. International Symposium in Power Electronics for Distributed Generation Systems (PEDG), IEEE, 603-607. DOI: 10.1109/PEDG.2012.6254064Yang Y., Ma J., Ma Y., Zou Y., 2014. The universal design criterion of coupled inductor in multiphase interleaving and magnetically integrated bidirectional DC/DC converter. Conference and Exposition International in Power Electronics and Application, IEEE, 1008-1013. DOI: 10.1109/PEAC.2014.7037998Yang Y., Dai S., 2015. Design criterion for asymmetric coupled inductors in interleaving & magnetically integrated bidirectional DC/DC converter. 2nd Conference International in Future Energy Electronics, IEEE, 1-11. DOI: 10.1109/IFEEC.2015.7361443Yu, B. (2016). Design and experimental results of battery charging system for microgrid system. International Journal of Photoenergy, 2016

Response of obesity-resistant BALB/c mice to a ketogenic diet

Introduction. The ketogenic diet (KD) is a high-fat, low-carbohydrate diet in which the body undergoes metabolic adjustments that stimulate ketogenesis, thereby increasing circulating ketone bodies. Loss of body weight is attributed to these adjustments, as well as neuroprotective properties. However, the mechanisms involved are still not fully elucidated. That aim of this work was to evaluate the effect of a ketogenic diet on body composition, feeding behavior and glucose metabolism in mice of the BALB/c strain, a mouse model resistant to obesity. Materials and methods. BALB/c mice of both sexes, 12 weeks old, were divided into KD and control groups, which received a ketogenic diet (Research Diets) or standard chow (LabDiet 5001), respectively, for 23 days. Throughout the experiment, body weight gain, water and food intake were measured, whereas body mass index (BMI), the percentage of interscapular, inguinal, and visceral adipose tissue and blood b-hidroxybutyrate levels were measured at the end of the protocol. In addition, glucose tolerance tests were carried out at the beginning and at the end of the experiment. Results. Similar body weight gain (10%) was observed in males and females on KD compared to the control group (p\u3c0.05). However, a higher BMI was observed only in males. The KD group consumed 50% less food in both sexes, whereas water consumption was diminished 25% in males and 50% in females, compared to the control (p= 0.0001). The estimated energy intake was lower (12 Kcal) in males on ketogenic diet, but not in females. Regarding the metabolic state at day 23, in KD mice levels of b-hidroxybutyrate increased to 0.4 mmol/L in males and 0.7 mmol/L in females. Mice of both sexes on KD showed increased inguinal and visceral fat, when compared to the control group on standard chow. At day 23, the glucose tolerance test showed an increase in the area under the curve, indicating impaired glucose tolerance, in both males and females on KD. Conclusions. In obesity-resistant BALB/c mice, the consumption of a ketogenic diet for a short period induces a state of nutritional ketosis accompanied by weight gain, increased fat tissue, and impaired glucose intolerance

Galaxies behind the Galactic plane: First results and perspectives from the VVV Survey

Vista Variables in The Via Lactea (VVV) is an ESO variability survey that is performing observations in near infrared bands (ZYJHKs) towards the Galactic bulge and part of the disk with the completeness limits at least 3 mag deeper than 2MASS. In the present work, we searched in the VVV survey data for background galaxies near the Galactic plane using ZYJHKs photometry that covers 1.636 square degrees. We identified 204 new galaxy candidates by analyzing colors, sizes, and visual inspection of multi-band (ZYJHKs) images. The galaxy candidates colors were also compared with the predicted ones by star counts models considering a more realistic extinction model at the same completeness limits observed by VVV. A comparison of the galaxy candidates with the expected one by Milennium simulations is also presented. Our results increase the number density of known galaxies behind the Milky Way by more than one order of magnitude. A catalog with galaxy properties including ellipticity, Petrosian radii and ZYJHKs magnitudes is provided, as well as comparisons of the results with other surveys of galaxies towards Galactic plane.Comment: 27 pages, 10 figures, 2 tables; in press at The Astronomical Journa

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Results of donor after cardiac death circulation activation: recuperation of spontaneous circulation analysis.

The activation procedure of a potential donor after cardiac death begins after recognition of a situation of unrecovered PCR patient meets the criteria donor after cardiac death. Still have to meet a number of medical conditions and logistical both for the potential donor becomes effective donor. The aim of this study is to describe this procedure and know the number of potential donors who finally become effective donors. Method: Collection of all activations procedure after cardiac death donor HU 12 de Octubre for 5 years (2009-2013). Data collection is performed on a web platform created for this purpose.post-print255 K

VOLUMEN 11, NÚMERO 25 (1977)

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