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1
artículo
Publicado 2021
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Luego de haber leído con mucho interés el articulo “Bolos epidurales intermitentes programados para mantenimiento de la analgesia del trabajo de parto: estudio observacional, analítico de tipo cohorte” por Calderon Lozano Marjorie et al. publicado en el volumen 9 número 3 de la Revista Peruana de la Investigación Materno Perinatal (INMP), considero de suma importancia poder responder la pregunta si realmente esta tecnica de mantenimiento de analgesia prolonga los tiempos del trabajo de parto teniendo en cuenta la información actual. La analgesia epidural actualmente es la técnica más segura y eficaz con la que contamos para controlar el dolor de parto1. Ya se ha comprobado seguridad materna fetal1,2 y en general no prolonga los tiempos del trabajo de parto, solo se la asocia con un aumento del parto instrumentado en el expulsivo1. El mantenimiento de la analgesia p...
2
artículo
Publicado 2021
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Luego de haber leído con mucho interés el articulo “Bolos epidurales intermitentes programados para mantenimiento de la analgesia del trabajo de parto: estudio observacional, analítico de tipo cohorte” por Calderon Lozano Marjorie et al. publicado en el volumen 9 número 3 de la Revista Peruana de la Investigación Materno Perinatal (INMP), considero de suma importancia poder responder la pregunta si realmente esta tecnica de mantenimiento de analgesia prolonga los tiempos del trabajo de parto teniendo en cuenta la información actual. La analgesia epidural actualmente es la técnica más segura y eficaz con la que contamos para controlar el dolor de parto1. Ya se ha comprobado seguridad materna fetal1,2 y en general no prolonga los tiempos del trabajo de parto, solo se la asocia con un aumento del parto instrumentado en el expulsivo1. El mantenimiento de la analgesia p...
3
artículo
Publicado 2024
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Objective: To determine the standard surgical times of the four most common general surgery procedures (unilateral inguinal hernioplasty, bilateral inguinal hernioplasty, umbilical hernioplasty and cholecystectomy) in a second-level hospital and to estimate the probability of extending the time of each of the procedures. Efficiency is a widely studied subject in economics. It involves the need for fewer elements in the production of a certain level of goods and services. Therefore, it is extremely important to consider it in the field of surgery. Materials and methods: An observational, descriptive and retrospective study. It used the operating room records from 2017 to 2019 of the General Surgery service in a second-level hospital. Based on this information, the time required for each procedure was standardized using the mean for each one (umbilical hernioplasty, unilateral or bilateral...
4
artículo
Publicado 2020
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The aim of this research was to evaluate the use of different extenders for cooling of rabbit semen and its effect on sperm quality. Thirty semen samples from 10 sexually mature rabbits (Oryctolagus cuniculus) were used. Each sample was diluted separately in a 1:10 ratio in four extenders, composed of skim milk and sugars (T1); dextrose, sodium citrate, and potassium acetate (T2); sodium caseinates, phosphates and sugars (T3); and tris-citric acid and egg yolk (T4). The semen was kept at 16 °C for 72 hours. At the time of dilution and every 24 hours, total motility (MT), progressive motility (MP) and sperm kinetics were evaluated with the Sperm Class Analyzer® system, and vitality and morphology were evaluated by the eosin-nigrosin staining. Statistical analysis was performed using mixed models and the comparison of means by the Duncan test. At the time of dilution (0 h), a lower MT fo...
5
artículo
Publicado 2020
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The aim of this research was to evaluate the use of different extenders for cooling of rabbit semen and its effect on sperm quality. Thirty semen samples from 10 sexually mature rabbits (Oryctolagus cuniculus) were used. Each sample was diluted separately in a 1:10 ratio in four extenders, composed of skim milk and sugars (T1); dextrose, sodium citrate, and potassium acetate (T2); sodium caseinates, phosphates and sugars (T3); and tris-citric acid and egg yolk (T4). The semen was kept at 16 °C for 72 hours. At the time of dilution and every 24 hours, total motility (MT), progressive motility (MP) and sperm kinetics were evaluated with the Sperm Class Analyzer® system, and vitality and morphology were evaluated by the eosin-nigrosin staining. Statistical analysis was performed using mixed models and the comparison of means by the Duncan test. At the time of dilution (0 h), a lower MT fo...
6
artículo
Publicado 2024
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Introduction: Silver has been used since ancient times for its significant antibacterial potential that can be an effective alternative to combat antibiotic-resistant bacteria.. Objective: The objective was to evaluate the bactericidal activity of aqueous silver solution on strains of Escherichia coli and Klebsiella pneumoniae producing extended spectrum beta-lactamases (ESBL). Material and Methods: Experimental study with increasing stimulus, where 225 units of analysis were evaluated, consisting of 14 cultures of E. coli BLEE, 01 culture of Kl. pneumoniae BLEE, 5 concentrations of aqueous solution, with three applications per experiment. The electrochemical method was used to obtain the aqueous silver solution and its bactericidal activity was determined with the minimum bactericidal concentration. In addition, the growth curve of the bacterial strains was established by counti...
7
artículo
Publicado 2025
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Future time perspective extension is an individual's perception of the psychological distance between future goals. The concept of extension can be expanded to include how far into the future an individual habitual time space extends and the diffusion of goals within that time space. This alignment and distance may be related to the individual episodic future thinking, the pre-experiencing of future events. Research in FTP and EFT are typically siloed; considering both approaches to future thinking provides not only greater insight into the two constructs but may also provide avenues for developing interventions. Participants in this study (n = 13) were recruited from a scholarship program designed to provide them with financial support as they progress from community college to high-wage careers in science and engineering. Students were transitioning from two-year programs at local comm...
8
artículo
Publicado 2022
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This article analyzes the dynamic of an extended SEIR model for the spread of COVID-19 considering a system of 7 differential equations whose stages are susceptible, exposed, infected, quarantined, recovered, dead and vaccinated. The necessary and sufficient conditions are determined for non-negativity, delimitation, existence and uniqueness of the solution of the model, local stability of the equilibrium points and the next generation matrix method. The simulations made in Python complement the qualitative analysis of the mathematical model to conclude the behavior of the virus spread over time; the information shown in this work could also be useful for the development of new prevention measures.
9
artículo
Publicado 2025
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Se evaluó el efecto del contenido de materia grasa (%MG), en leche descremada UHT usada como diluyente seminal sobre la integridad de membrana plasmática y la motilidad progresiva (MP) de espermatozoides caninos preservados a 4 °C. Se obtuvieron 20 eyaculados mediante manipulación digital de 10 perros Bulldog Inglés y American Bully de fertilidad probada. Cada eyaculado fue evaluado a través de espermiograma convencional y de una prueba hipoosmótica simplificada (HOST-s). Las muestras fueron fraccionadas y diluidas en relación 1:3 con leche descremada UHT como diluyente a 0%MG y 0.5%MG, con adición de estreptomicina (50 mg/100 ml) y penicilina sódica (50 mg/100 ml). El semen fue mantenido en refrigeración a 4 °C. La MP fue 92.50 ± 6.72% y la respuesta a HOST-s fue 90.65 ± 5.03% en el semen fresco. Se realizaron evaluaciones de MP y HOST-s a las 0, 24, 48 y 72 horas de ref...
10
tesis de grado
Publicado 2022
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Universidad Nacional Agraria La Molina. Facultad de Zootecnia. Departamento Académico de Producción Animal
11
tesis de grado
Publicado 2024
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El presente informe por suficiencia profesional muestra la selección de un equipo de microfiltrado, diseño y montaje a bordo en una pala hidráulica 6040FS de la empresa COSAPI MINERÍA S.A.C. Este nuevo sistema de microfiltración realizará una filtración adicional y en paralelo al sistema que la pala hidráulica tiene de fábrica, con el objetivo de obtener un lubricante más limpio y así extender la vida útil del aceite hidráulico y, por consiguiente, cuidar los componentes hidráulicos que interactúan con este aceite. La instalación de este equipo de microfiltrado se planteó que sea a bordo puesto que de esa forma asegurará que el aceite en circulación esté lo más limpio posible en tiempo real, para que pueda ser utilizado en los distintos componentes hidráulicos del equipo durante la operación. También se muestra el seguimiento al funcionamiento de este nuevo sistem...
12
artículo
El presente trabajo tuvo el propósito de evaluar la eficiencia de tres dilutores: Trisglucosa, Tris-fructosa y un dilutor comercial de cerdo, en la conservación del semen de alpaca. Se utilizaron 12 machos que fueron entrenados por un mes en la colección de semen con vagina artificial y frazadilla eléctrica. Los animales fueron de la Sub-Estación ExperimentalQuimsachata del INIA, Puno. El semen tuvo las siguientes características: volumen de 2.7 ± 0.8 ml, viscosidad de 1.04 ± 0.3, motilidad de 54.0 ± 8.0%, pH con tendencia a la alcalinidad, concentración de 248,100 espermatozoides/ml, y el color que predominó fue el blanco lechoso. El tiempo promedio de cópula fue de 26.5 ± 3.8minutos. Se utilizó un factor de dilución de 1 en 2 para semen y dilutor, respectivamente. Las diluciones fueron evaluadas considerando lamotilidad individual como único parámetro para determinar l...
13
artículo
The present workwas carried out at the Experimental Research Station Quimsachata- INIA, Puno. The objective was to evaluate the efficiency of three semen extenders in alpaca semen: Tris-glucose,Tris-fructose and a pig´s commercial extender. Twelve animals were selected for semen collection using the artificial vagina. Males were trained for a month.Mean values for semen parameterswere: volume of 2.7 ± 0.8ml, viscosityof 1. 04 ± 0.3, motility of 54.0 ± 8.0%, pHtowards to alkaline, concentration of 248,000 sperms/ml, and themost common color wasmilkywhite. The average time for the copula was 26.5 ± 3.8 minutes. Semen was diluted in 1:2 and the dilutions were evaluated on individual motility as the only parameter for sperm viability. The extender Tris-glucose had an average of 5.8 ± 1.1 hours viability, Tris-fructose had 6.1 ± 2.5 hours, and the commercial extender had 5.5 ± 1.0 hou...
14
artículo
Publicado 2021
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The time interval after tooth bleaching is a significant variable for the adhesion to the tooth structure. The bleaching agents used on the enamel surface, due to the degradation of the peroxides used, generate oxygen free radicals that alter the bonding strength. The literature has shown conclusively that the time that has elapsed since a bleaching to the moment of restoration is decisive for the adhesion to the enamel. The objective of this work was to review the literature about the influence of time after dental bleaching and its effect on the strength of adhesion to enamel of composite resins. Data collection was carried out through electronic databases such as: Scielo, EBSCO, academic repositories, obtaining 36 articles and thesis. After the analysis, it can be considered that time is decisive in the adhesive resistance and that the alterations after tooth bleaching extend until th...
15
artículo
Publicado 2021
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The research focuses on analyzing transmedia narratives when reporting on an earthquake from a national digital newspaper, an international one, and also the impact of Facebook when disseminating the event. The objective is to compare the content generated about the earthquake of April 16, 2016, in Ecuador through transmedia tools in El Comercio (Ecuador) and El País (Spain), and Facebook. The aim is to know the role of the audience as prosumers of information. The methodology applied was mixed: qualitative and quantitative; the sample analyzed was 1126 informative pieces from El Comercio, 44 from El País and 1155 Facebook mentions. The need to educate and inform citizens about preventing the consequences of natural disasters and the treatment given by digital media justifies the study. The importance of having prevention measures makes this research a contribution to citizenship. The ...
16
artículo
The analytical model proposed by Bazant & Oh based on compatibility of deformations and equilibrium of forces in RC cross sections is extended and presented to predict short-time deformations. Stresses and deflections in beams strengthened with 01' without FRP plates epoxy- bonded to the tension face of rectangular and T cross sections. The theory assumes concrete to have a nonzero tensile carrying capacity. A parametric study was conducted to invesugate some design parameters such as plate area. plate stiffness and strength, concrete compressive strength and steel reinforcement ratio. To this end. moment-curvat ure diagrams lI'ere generated to know the influence of such parameters in the flexural response of the section. In all cases studied, adding the plate to the cross section increases the yield and ultimate tnoment capacity substantially in sections with a low steel reinforceni...
17
artículo
The analytical model proposed by Bazant & Oh based on compatibility of deformations and equilibrium of forces in RC cross sections is extended and presented to predict short-time deformations. Stresses and deflections in beams strengthened with 01' without FRP plates epoxy- bonded to the tension face of rectangular and T cross sections. The theory assumes concrete to have a nonzero tensile carrying capacity. A parametric study was conducted to invesugate some design parameters such as plate area. plate stiffness and strength, concrete compressive strength and steel reinforcement ratio. To this end. moment-curvat ure diagrams lI'ere generated to know the influence of such parameters in the flexural response of the section. In all cases studied, adding the plate to the cross section increases the yield and ultimate tnoment capacity substantially in sections with a low steel reinforceni...
18
artículo
Publicado 2011
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The aim of the study was to determine the maximum time to recover and cryopreservespermatozoa from the tail of canine epididymis post orchiectomy. The testes were obtainedthrough orchiectomy from 20 dogs aged 1 to 8 years. The testis were placed in sodiumchloride 0.9% and stored at 5 °C for 0, 24, 48 and 72 hours. Spermatozoa were recoveredby cutting the tail of the epididymis in an extender based on Tris-citrate-fructose. For the cryopreservation process, egg yolk (20%) and glycerol (5%) was added to the dilutedsample (sperm + dilutor). The new dilution was packaged in 0.5 ml straws, which weresubjected to a cooling curve and then placed in liquid nitrogen. Total motility, progressivemotility and functional integrity of the membrane were evaluated. Beforecryopreservation process, total motility after 24 and 72 hours of storage at 5 ºCdecreased (p<0.05). However, total motility foun...
19
tesis de grado
Publicado 2024
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La investigación aborda los desafíos que enfrenta el Perú en el desarrollo de infraestructura y procesos, destacando la importancia de tecnologías como SLAM (Localización y Mapeo Simultáneos) para mejorar la precisión en la localización y mapeo en tiempo real. Se propone desarrollar una solución SLAM mediante un filtro de Kalman extendido para la odometría visual, implementado con la librería OpenCV en un entorno de desarrollo integrado. Aunque no se lograron resultados experimentales completos, se estableció una sólida base teórica e de implementación para EKF-SLAM, incluyendo la infraestructura para la asociación de datos y el seguimiento de puntos de referencia. Sin embargo, persisten dificultades prácticas como la derivación empírica de la matriz de covarianza y la asociación de datos. Estos hallazgos señalan la necesidad de abordar limitaciones económicas y tec...
20
artículo
Publicado 2018
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Purpose - This study aims to investigate the market timing strategy in different market conditions (i.e. up, down, normal and in-financial-crisis situation) in the emerging market of Pakistan over the period 1995 to 2015. Furthermore, this study tests the validity of the capital asset pricing model (CAPM) and Fama and French model. Design/methodology/approach - This study considers monthly stock returns of 167 firms and constructs six different portfolios on the basis of different size and book to market ratio. The Treynor and Mazuy model is used to capture the market timing strategy. Findings - The results indicate evidence of the market timing in normal market conditions. However, there is less supportive evidence of market timing in up-market, down-market and in-financial-crisis situations. This study also confirms the validity of the capital asset pricing model and Fama and French th...
