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1
artículo
Publicado 2019
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The development rates and the quality of the bovine embryos produced in vitro are lower than those produced in vivo, due to the oxidative stress to which they are subjected during their manipulation and the culture conditions. The aim of this study was to evaluate the production, cellularity and vitality of bovine blastocysts produced in vitro with different concentrations of quercetin. A total of 2108 oocytes were matured in vitro in medium 199 with 10% FBS, 5.0 μg/ml LH and 0.5 μg/ml FSH. Fertilization was carried out in TALP medium with 2x106 spermatozoa/ml. Potential zygotes were cultured at 38.7 °C with 5% CO2 in SOF culture medium supplemented with six concentrations of quercetin (1, 5, 10, 15, 20, 50 μM) and as controls were used the SOF medium without quercetin and supplemented with DMSO. The rates of cleavage (day 2) and blastocysts (day 7) were determined, as well as the ce...
2
artículo
Publicado 2019
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The development rates and the quality of the bovine embryos produced in vitro are lower than those produced in vivo, due to the oxidative stress to which they are subjected during their manipulation and the culture conditions. The aim of this study was to evaluate the production, cellularity and vitality of bovine blastocysts produced in vitro with different concentrations of quercetin. A total of 2108 oocytes were matured in vitro in medium 199 with 10% FBS, 5.0 μg/ml LH and 0.5 μg/ml FSH. Fertilization was carried out in TALP medium with 2x106 spermatozoa/ml. Potential zygotes were cultured at 38.7 °C with 5% CO2 in SOF culture medium supplemented with six concentrations of quercetin (1, 5, 10, 15, 20, 50 μM) and as controls were used the SOF medium without quercetin and supplemented with DMSO. The rates of cleavage (day 2) and blastocysts (day 7) were determined, as well as the ce...
3
artículo
Publicado 2022
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The aim of this study was to know the perception and knowledge of small producers about the behavior of the climate, its effect on milk production and the practices that allow adaptation to this behavior. The study was developed in Carmen de Carupa and Suesca (Cundinamarca, Colombia) with 40 producers who shared their knowledge through a semi-structured interview. The causes of climate change, events that affect milk production, changes in the climate in recent years and strategies that allow its adaptation were investigated. The humidity temperature index, precipitation, milk production and forage quality were determined. Frequency and principal component analysis were analysed through the Infostat® program. Producers considered deforestation as the main cause of climate change, perceived changes in climate and recognized droughts, frosts and high temperatures as events with the greate...
4
artículo
Publicado 2015
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Stevia rebaudiana Bertoni is an specie with sweetening properties, and a product used as alternative to sugar and artificial sweeteners. The objective of the research was to evaluate the hypoglycemic effect of a tablet made with the atomized extract of leaves of Stevia rebaudiana Bertoni. The hypoglycemic effect was determined using the glucose tolerance test, for which it was used 05 male rats, holtzman strain, average weight 210 ± 10g, divided in 5 groups with 6 specimens each, applying to each group a different treatment. The change in glucose levels versus time were evaluated, the area under the curve (AUC) of the different treatments was calculated. The tablet produced from the atomized stevia extract showed an AUC of 210,68 ± 57, similar to insulin with an AUC of 247,43 ± 24,2. From multiple comparisons of mean AUC, using the Duncan test at 95% confidence level, it was determine...
5
artículo
Publicado 2022
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The main idea of this article is to present the effects of the strategic and geopolitical theories of Golbery do Couto e Silva, on the other Brazilian military and political leaders who succeeded them. In addition to being a general in the Brazilian Army and a geopolitician, he was one of the main theoreticians of the National Security Doctrine of the 1950s and one of the creators of the National Information Service (SNI). The historical context in which Golbery lived was influenced by World War II, the rise and fall of international communist regimes, and the failed attempt to insert communism in Brazil, coexisting with the rise of the military to the Executive Power. In this way, the public life of Golbery do Couto e Silva was based on roles at the forefront of politics and the Brazilian Army, providing him with vast experience in matters related to national strategy, where he pr...
6
documento de trabajo
Publicado 2020
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Este estudio aborda los efectos que vinculan la planificación adaptativa y el capital social que impulsan la innovación empresarial. Se ha seleccionado un estudio de caso que involucra a una comunidad de productores de pisco, agrupados en torno a un centro de innovación productiva y transferencia de tecnología (CITE agroindustrial) en la zona sur de Lima, Perú. El estudio examina cómo han cambiado sus percepciones durante un período de seis años (2012-2018). Los resultados muestran el efecto de mediación que tiene la planificación adaptativa promovida a través de las actividades del CITE entre el capital social y la innovación, que además se fortalece con el tiempo. En conjunto con esto, se investiga una ruta para la innovación empresarial que va más allá de la dicotomía necesidad-oportunidad, a través de comportamientos asociativos y colaborativos, y una planificación...
7
artículo
Publicado 2021
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The research results obtained on the effect that occurs on the properties of the synthesis gas obtained as a result of a biomass downdraft gasification process is presents in this paper, working with a cogeneration system internal to the reactor. A study of the previous related works was carried out, from which the dependent and independent variables necessary to evaluate the final quality of the process in the presence and absence of cogeneration were determined. For this, an experimental statistical design of four levels of type 4n was implemented, which allowed the performance of a comparative statistical analysis of the working states of the gasifier. On the other hand, an energy and exergy analysis of both states is presented where the potential of the gasification process to reuse thermal energy can be verified by incorporating a cogeneration system.
8
artículo
Publicado 2021
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The research results obtained on the effect that occurs on the properties of the synthesis gas obtained as a result of a biomass downdraft gasification process is presents in this paper, working with a cogeneration system internal to the reactor. A study of the previous related works was carried out, from which the dependent and independent variables necessary to evaluate the final quality of the process in the presence and absence of cogeneration were determined. For this, an experimental statistical design of four levels of type 4n was implemented, which allowed the performance of a comparative statistical analysis of the working states of the gasifier. On the other hand, an energy and exergy analysis of both states is presented where the potential of the gasification process to reuse thermal energy can be verified by incorporating a cogeneration system.
9
artículo
Publicado 2024
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Se evaluó el efecto de cuatro edades de cosecha (90, 120, 150 y 180 días) sobre el rendimiento de biomasa aérea y composición química de la colza, así como su uso como suplemento henificado para vacas lecheras en pastoreo a 3279 msnm. El rendimiento forrajero y la composición química se evalúo en 16 parcelas, 4 por tratamiento, de acuerdo con un diseño de bloques completos al azar. La biomasa de colza cosechada fue henificada y picada a 1 cm de longitud, suministrada diariamente a razón de 3 kg por vaca. Dieciséis vacas Holstein cruzadas y multíparas se distribuyeron en cuatro tratamientos que consistieron en henos elaborados de acuerdo con la edad de cosecha. La producción de leche por vaca se registró durante seis semanas. Los sólidos totales, grasa, proteína y lactosa se determinaron en la última semana del estudio. A medida que la edad de la colza fue mayor se incre...
10
artículo
Publicado 2021
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The perception of environmental pollution from objective public and private advertising in Peru was diagnosed. A 20-question semi-structured survey was used that was composed of three dimensions: primary information, environmental impacts and consequences, and control measures. The sample was 1,200 people and ran from May 20 to June 06, 2019. Respondents consider signs for political campaigns as the worst form of visual contamination. Graffiti has an environmental impact in cities, generating a terrible image. Digital propaganda signs generate impacts associated with glare and distraction of people, and posters are polluting elements. Advertising affects their concentration, and generates distraction causing their senses to alter, causing them to be in a bad mood and changes in their mood, and increases their stress levels. Also, they consider that visual contamination has an impact on t...
11
artículo
Publicado 2023
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All stages of the scientific research process require communication, be it oral, written or audiovisual, for this purpose the knowledge producer (researcher) uses various academic-institutional strategies in order to construct science in writing. For this task of writing an academic text better, be it a research plan, academic report, final research report, scientific article, academic article, or another similar one, we appeal to the theory initiated by G. Genette (1989) called transtextuality, transcendence of the text. One of the modalities is intertextuality understood as the explicit or implicit co-presence of texts in one; This inevitable phenomenon is evident in the communication of science as soon as the various reference strategies are used, which make the academic text that is constructed result in a linguistic network based on the microstructure, macrostructure and textual sup...
12
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...
13
artículo
Publicado 2019
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Dehiscences and fenestrations are commonly observed as a result of a secondary effect in orthodontic treatment. These characteristics are only visualized with high resolution images. where thickness, depth and height are quantified. In addition, said images are taken by cone bean computed tomography, which is an specific tool to diagnose dehiscences and fenestration, due to its reliability and help in diagnosis of support tissue. The objective is to prevent bone defects after an appropiate treatment. The cone bean computed tomography (CBCT) is a useful tool to determine the prevalence of dehiscence and fenestration in post-orthodontic patients. That is why, the cone bean computer tomography must be included as a diagnostic assistance before the beginning of the orthodontic treatment with the purpose of avoiding bone defects which are caused by orthodontic movements like bucco-lingual d...
14
artículo
Publicado 2009
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This study aims to analyze the main causes of major environmental disasters caused by mining-metallurgical activities worldwide. 363 cases were analyzed, including significant incidents and disasters, as reflected in various databases, reports and publications. The main causes of these disasters should be noted: 1) insufficient or improper environmental impact study (EIA), 2) the failure of waste storage structures ( Tailing dams, tailings piles leaching, etc.). 3) No using best available techniques (BAT) in mines and metallurgical activities, 4) errors in the design of facilities, 5) failure to use appropriate security measures according to the risks involved. The magnitude of these disasters has been increasing for several reasons: the negligent behaviour of firms and administrations, the existence of nearby villages, the unique and fragile ecology of the area of location of mining ope...
15
artículo
Publicado 2009
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This study aims to analyze the main causes of major environmental disasters caused by mining-metallurgical activities worldwide. 363 cases were analyzed, including significant incidents and disasters, as reflected in various databases, reports and publications. The main causes of these disasters should be noted: 1) insufficient or improper environmental impact study (EIA), 2) the failure of waste storage structures ( Tailing dams, tailings piles leaching, etc.). 3) No using best available techniques (BAT) in mines and metallurgical activities, 4) errors in the design of facilities, 5) failure to use appropriate security measures according to the risks involved. The magnitude of these disasters has been increasing for several reasons: the negligent behaviour of firms and administrations, the existence of nearby villages, the unique and fragile ecology of the area of location of mining ope...
16
tesis doctoral
Publicado 2023
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Staphylococcus aureus is a major cause of subclinical mastitis in dairy cows, and the development of antibiotic resistance has limited effective treatment options. This comprehensive study evaluated the virulence, antimicrobial resistance, and therapeutic alternatives based on essential oils (EOs) for spa type t605 S. aureus isolates from subclinical bovine mastitis in São Paulo, Brazil. The study also aimed to investigate the presence of virulence genes, identify genetic variations through spa and agr typing, determine phenotypic antibiotic resistance profiles, identify major chemical constituents of eight different EOs (Citrus aurantium bergamia - Bergamot, Copaifera reticulata - Copaiba, Foeniculum vulgare - Fennel, Zingiber officinale - Ginger, Ocimum basilicum - Basil, Luma chequeen – Arrayan, Mentha spicata - Spearmint, and Eugenia caryophyllus – Clove), and assess their antim...
17
artículo
Publicado 2023
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The aim of this study is to evaluate the effects of ferrate (VI)-based treatment on surface water collected from the Rímac River as an irrigation water treatment model for bean (Phaseolus vulgaris), lettuce (Lactuca sativa), and radish (Raphanus sativus) plant species irrigated with treated water in the experimental field. The experimental field was divided into eight 625 m2 plots (50 m × 12.5 m) with sandy loam soil (sand 51%, silt 30%, clay 19%). The treatment system operated uninterrupted for three and a half months without deterioration in production, demonstrating that it can function continuously to improve water quality even when the effects on the parameters evaluated here did not reveal significant differences, presumably due to the prevailing effect from metal concentrations already found in the soil. This study also seeks to validate the effect of treatment on the concentrat...
18
artículo
Publicado 2022
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Stevia rebaudiana is considered an important medicinal plant possessing low-calorie glucoside sweeteners. The present work describes the comparison of three stevia genotypes (IBT 1, IBT 2 and IBT 3) in two contrasting environments simulated under controlled conditions: Sullana in Peru; and Misiones in Paraguay (regarded as the center of origin of Stevia). In the study, we explored the Euclidean distance as an integrating indicator for simultaneous selection of several stevia traits. Plant scientists often record multiple morphological, physiological and biochemical indicators in their experiments. Common statistical data evaluations involve univariate analyses such as t-test, Mann-Whitney and Analysis of Variance followed by Tukey HSD. However, these analyses do not evaluate integrally the effects of the experimental treatments because each indicator is analyzed independently. Euclidean ...
19
artículo
Publicado 2024
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Introduction: Hospital-acquired infections (HAI) due to antibiotic-resistant bacteria are a public health problem, and the hospital environment is a favorable reservoir for various pathogens, therefore a health option for pathogen control is to evaluate the bactericidal activity of textile platforms with yarn copper against pathogens that cause carbapenemase-resistant HAI. Materials and methods: the bactericidal capacity of the biomedical textile with and without copper thread was evaluated in four bacterial strains: Escherichia coli, Pseudomonas aeruginosa, Klebsiella peumoniae and Staphylococcus aureus. Differences in survival time and bacterial density were established using ANOVA and Tukey tests with a significance level of P <0.05 in triplicate. Results: The survival of E. coli, K. pneumoniae, P. aeruginosa and S. aureus, on biomedical textiles with copper thread, was 80, 90,...
20
artículo
Publicado 2001
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During the last decade of the Twentieth century Peru has undertaken a public firms' privatization process involving the transfer of ownership at firms producing intermediate goods to foreign investors. This essay proposes a model for assesing the macroeconomic effects produced by the privatization of this kind of companies on the telecommunication industry. By using National income as a reference unit for measuring impacts, the model captures analytically, as short-term effects the rise in the relative prices of telephone services along with the transfer of poverty and the filling of the market gap led by the raise in service coverage. Furthermore, the model finds in the long-term a positive effect from the consequences of technological innovation at the sector, in the end a source of endogenous growth. Synthesizing, the essay concludes that a priori it is impossible to determine the nat...
