Tópicos Sugeridos dentro de su búsqueda.
Tópicos Sugeridos dentro de su búsqueda.
Buscar alternativas:
para extender » para entender (Expander búsqueda), para atender (Expander búsqueda), para aprender (Expander búsqueda)
extender from » extender los (Expander búsqueda)
para extender » para entender (Expander búsqueda), para atender (Expander búsqueda), para aprender (Expander búsqueda)
extender from » extender los (Expander búsqueda)
1
artículo
This text is composed of 4 sections. In the first one, I recovered the emotive speech made by WilburSchramm about the first television broadcasting carried out on January 26th 1926 by John Logie Bairdin order to support the relevance of the term “Age of television”. The television is actually considered asthe emblematic media in the “Age of electricity”. In the second section, I studied the thesis developed byMarshall McLuhan about the so-called “shy giant”. At the beginning of 1960s, the television captivatedMarshall McLuhan. From a particular ecumenical perspective, the Canadian researcher believed thatthe television would restore the sensitive balance, thus favoring the transition to the “global village”. Asthe years went by, his optimism about the television started to vanish, and McLuhan adopted a morecritical position, similar to Neil Postman’s, against the televi...
2
artículo
This text is composed of 4 sections. In the first one, I recovered the emotive speech made by WilburSchramm about the first television broadcasting carried out on January 26th 1926 by John Logie Bairdin order to support the relevance of the term “Age of television”. The television is actually considered asthe emblematic media in the “Age of electricity”. In the second section, I studied the thesis developed byMarshall McLuhan about the so-called “shy giant”. At the beginning of 1960s, the television captivatedMarshall McLuhan. From a particular ecumenical perspective, the Canadian researcher believed thatthe television would restore the sensitive balance, thus favoring the transition to the “global village”. Asthe years went by, his optimism about the television started to vanish, and McLuhan adopted a morecritical position, similar to Neil Postman’s, against the televi...
3
artículo
Publicado 2011
Enlace
Enlace
We study a system formed by M dimers through half-filled two-site Hubbard model, with two electrons. Our approach use the third version of Nonextensive Statistical Mechanics as tool for calculating thermodynamic and magnetic parameters such as entropy, internal energy, magnetization and specific heat. In the computer simulations, we vary the q entropic index values between 1 and 2, such that, q = 1.0, 1.4, 1.7 and 2.0. These values are interesting to study small magnetic systems. We find the critical temperature regions in simulations with the simple Hubbard model, i.e. without the intersite interaction. For other side, adding this additional term, we notice an enlargement and shifting of the thermodynamic parameters comparing with the obtained from simple Hubbard model; even more, we found in some cases the absence of the critical temperature regions.
4
artículo
Publicado 2021
Enlace
Enlace
The structure of this essay consists of three sections. The first section refers to the historic weaving that has refined the new corrective technologies of the individual. The second section conceives a critical perspective of the school by comparing it with an industry that produces tame students with manipulable moralities. The third section exemplifies how, even in the extended classroom, the restraint and subjectivation devices of these corrective technologies of the student not only continued to manifest but when imbricated with authority in the family context, seem to increase. In addition, all the sections have been sustained in the sense of some critical student and teachers’ perspectives of what was (and still is), exercising their professional practice living those formative processes from the Aprende en Casa strategy. Furthermore, the sensation, maybe shared, of having lost...
5
artículo
Publicado 2024
Enlace
Enlace
The indiscriminate use of antimicrobials has led enterobacteria such as Escherichia coli to develop a variety of resistance mechanisms such as the production of extended-spectrum beta-lactamases (ESBL). Beta-lactam antimicrobials including penicillins, monobactams, and cephalosporins are among the most widely used in both animals and humans; Therefore, the presence of ESBL-producing E. coli (ESBL-EC) has the ability to hydrolyze these antimicrobials, leading to resistance against this class of agents, which represents a potencial threat to human and animal health. This study aimed to determine the presence of ESBL-EC in fecal samples from cattle at two slaughterhouses in Lima, Peru. A total of 260 fecal samples from cattle were collected at two slaughterhouses: S1 (n=134) and S2 (n=126). Antibiotic discs of cefotaxime (CTX) 30 µg, aztreonam (ATM) 30 µg, ceftazidime (CAZ) 30 µg, cefpod...
6
artículo
Publicado 2020
Enlace
Enlace
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...
7
artículo
Publicado 2020
Enlace
Enlace
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...
8
artículo
Publicado 2021
Enlace
Enlace
The aim of this study was to evaluate sodium caseinate (CS) in the dilution and freezing of bovine semen. Fifteen ejaculates from five bulls were diluted and then individually frozen using a diluent composed of tris-glycerol-citric acid with 8% v/v of low-density lipoproteins (LDL) and supplemented with CS in four treatments: CS 3% w/v (CS3), CS 4% w/v (CS4), CS 5% w/v (CS5) and without CS (Control). The mobility and kinetics (SCA® System) and the functional integrity of the membrane (HOS test) of the fresh, extended and thawed semen were evaluated. In addition, the morphology and vitality (eosin-nigrosin) of the fresh and extended semen, and the structural integrity of the membrane (SYBR14/IP), the acrosome integrity (FITC-PNA) and the in vitro fertilizing capacity (IVF) of thawed semen were evaluated. The statistical analysis of the sperm quality parameters was performed using linear ...
9
artículo
Publicado 2018
Enlace
Enlace
Objective: To determine the clonality pattern assessed by ERIC-PCR and REP-PCR in extended-spectrum beta-lactamase (ESBL)-producing Escherichia coli and Klebsiella pneumoniae isolates from patients with urinary tract infections at the Hospital Regional Lambayeque (HRL) from July to November 2015. Materials and methods: A total of 30 ESBL-producing E. coli and K. pneumoniae clinical isolates collected from the HRL’s emergency, medicine, surgery and pediatrics services were assessed. The clonal relationship was determined using the ERIC-PCR and REP-PCR markers. For clusters, UPGMA algorithm with Bio Rad Quantity One 1-D analysis software was used, thus generating dendrograms through the union of the electrophoretic profiles obtained by both molecular markers. Results: From the molecular analysis, three predominant clonal patterns were found in E. coli and two in K. pneumoniae. Conclusion...
10
artículo
Publicado 2025
Enlace
Enlace
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...
11
artículo
A literature review is presented on the effects of school day extension programs implemented in various Latin American countries. According to their objects of interest, the studies are grouped into four types of impacts: a) school performance, b) academic and career paths, c) labor, and d) school organization and culture. A predominance of quantitative evaluations that analyzed the results in Mathematics and Language were identified, thus it was considered pertinent to broaden the knowledge search proposed from the programs. Other studies identified positive impacts on students' trajectories and their household economy; however, these results still need to be strengthened through similar studies in other contexts, which also inquire about the factors that explain these causes. Lastly, future studies should consider the particularities of each program in the search for their effects.
12
artículo
Objective: To study the presence in two hospitals of Lima of extended spectrum β-lactamases (BLEE) and to identify TEM and SHV types produced by Escherichia coli and Klebsiella pneumoniae strains. Material and Methods: The selection and confirmation of BLEE producing strains was done by antimicrobial susceptibility tests. The identification of bla TEM and bla SHV genes was achieved by polymerase chain reaction (PCR) and DNA sequencing. Results: One hundred and thirty seven Escherichia coli and 18 Klebsiella pneumoniae strains were isolated from hospitalized patients between July and September 2000. Most showed high resistance to third-generation cephalosporins and aztreonam;2,9% of all E.coli and 44,4% of all K.pneumoniae isolates were confirmed as BLEE producer strains. All BLEE producer strains were multidrug-resistant and most presented coresistance to trimethoprim/sulfamethoxazole, ...
13
artículo
Publicado 2007
Enlace
Enlace
Thirty-two semen samples from four rams were frozed using two antioxidants, Tempo (2,2,6,6 tetramethyl-1-piperidinyloxyl) and Tempol (4-hidroxi 2,2,6,6 tetramethyl-1- piperidinyloxyl), each one in concentrations of 0.5, 1.0, and 2.5 mM, to evaluate the effects on post-thawing motility, viability, acrosomal integrity, and earlier sperm capacitation. Eight replications for each antioxidant concentration and control group, were done using four semen samples per replication. Semen samples were diluted on a Tris extender. Results showed that Tempo 0.5 mM improved frozen semen quality in comparison with control group (p<0.05), by increasing progresive motility (79 vs. 67%), viability and acrosomal integrity (70 vs. 58%), and decreasing earlier sperm capacitation (9 vs. 15%). On the other hand, Tempol decreased frozen semen quality. In conclusion, the use of Tempo 0.5 mM on a Tris extender, ...
14
artículo
Publicado 2018
Enlace
Enlace
Introducción. El aumento de las tasas de resistencia en bacterias uropatógenas y su propagación se han convertido en un problema de salud pública a nivel mundial, cobrando mayor importancia la diseminación de aislamientos resistentes productores de ß-lactamasas de espectro extendido, resultando útil la caracterización molecular de plásmidos y otros elementos genéticos de las bacterias para establecer la relación genética que existe entre ellas y tener datos relevantes que puedan sugerir la dirección de propagación de este tipo de resistencia. El objetivo de nuestra investigación fue determinar los perfiles plasmídicos en aislamientos de Escherichia coli y Klebsiella pneumoniae productoras de ß-lactamasas de espectro extendido de urocultivos del Instituto Nacional de Salud del Niño, Lima, Perú. Métodos. Estudio descriptivo, observacional de corte transversal. Resultado...
15
tesis de grado
Publicado 2024
Enlace
Enlace
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...
16
artículo
Publicado 2024
Enlace
Enlace
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...
17
artículo
Publicado 2010
Enlace
Enlace
El estudio tuvo por objetivo evaluar el efecto de tres dilutores (Tris, Tes y leche descremada) en la criopreservación de espermatozoides obtenidos del epidídimo de alpaca. Previamente se determinó el efecto del tiempo entre el beneficio/castración y la recuperación de los espermatozoides del epidídimo. Se utilizaron 24 testículos de alpacas para la obtención de los espermatozoides directamente del epidídimo en una solución fisiológica buferada (PBS). La recuperación de espermatozoides se realizó a las 0, 35, 48 y 72 horas (6 testículos por grupo) y se evaluó la motilidad, concentración espermática e integridad funcional de membrana. Los espermatozoides recuperados a partir de 35 horas post beneficio/castración no fueron aptos para ser congelados. Las muestras recuperadas a las 0 horas fueron diluidas con Tris, Tes y leche descremada, enfriadas desde 35 a 5 oC en 90 min...
18
artículo
Publicado 2010
Enlace
Enlace
The objective of this study was to evaluate the effect of three semen extenders (skim milk, Tris, and Tes) on cryopreservation of epididymal alpaca sperm. Previously, the effect of timespan since slaughtering or castration to the recovery of epididymal sperm was evaluated. Twenty-four alpaca testicles were used to obtain sperm from the epididymis in a buffered saline solution (PBS). The recovery of spermatozoa was performed at 0, 35, 48, and 72 hours (6 testes per group) after slaughtering or castration. Sperm motility, concentration, and sperm membrane functional integrity were analyzed. Sperm recovered after 35 hours was not usable for cryopreservation. Sperm samples recovered at 0 hours were subjected to the process of freezing. Samples were diluted with skim milk, Tris, and Tes, cooled from 35 to 5 °C in 90 minutes, packed into 0.25 ml straws and frozen in liquid nitrogen. After tha...
19
artículo
Publicado 2022
Enlace
Enlace
The objective of this investigation is to test the hypothesis of the possible association of one or more microsatellites located on 425-4933 with NSCLP. In this study a sample of 51 extended pedigrees were analyzed. From these pedigrees a sample of 51 caseparents trios was obtained. A novel genetic analysis was carried out using the Extended Transmission Disequilibrium Test (ETDT). Also a case control study was carried out with the 51 probands of the case-parents trios plus a sample of 94 controls of the Chilean population to test if differences were observed resulting from the methods used for the association studies. Microsatellites D4S1570, D4S1615, FGA, UCP1 and D4S1597 located in 4q were analyzed. The polymerase chain reaction (PCR) was used for analysis of DNA. Forward primers were marked with fluorescent-dye-label. Electrophoresis and analyses were carried out in an ABI PRISM 377 ...
20
artículo
Publicado 2020
Enlace
Enlace
Objective: To determine the frequency of extended spectrum β-lactamases (ESBL) in clinical infections caused by Escherichia coli y Klebsiella pneumoniae and the frequency of CTX-M among them at the Instituto Nacional de Salud del Niño-Breña, Lima, Peru. Methods: ESBL producing strains of E. coli and K. pneumoniae collected from August 2012 and January 2013 were analyzed; a total of 724 E. coli and 181 K. pneumoniae consecutive, non- repeated isolates from community and hospital acquired infections were included. Identification was performed by conventional biochemistry, ESBL phenotype was detected following the Jarlier´s method and PCR was used to detect CTX-M. Results: overall prevalence of ESBL was 31% (281 strains); 207/724 (28.6%) E. coli and 74/181 (40.9%) K. pneumoniae. The bla gene was detected in 256 of ESBL producing strains (91.1%). Conclusions: The CTX-M phe...
