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1
artículo
Publicado 2022
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The Universidad Nacional Abierta y a Distancia (UNAD), a public higher education institution in Colombia, offers distance education programs at different levels of technical and professional training, specializations, and master’s degrees in virtual learning environments. Therefore, those entering the unadista student community for the first time require induction systems and tools that help their entry, adaptation, and transition to virtual training. Thus, an information system that supports the induction process of first time students focused on their transition from face-to-face to virtual training is needed. This information system must comply with two basic requirements: firstly, to be an online system that guides students in the first steps of their virtual training and, secondly, to help the university’s decision-making regarding the induction tools and the adaptation resource...
2
artículo
Publicado 2022
Enlace
Enlace
The Universidad Nacional Abierta y a Distancia (UNAD), a public higher education institution in Colombia, offers distance education programs at different levels of technical and professional training, specializations, and master’s degrees in virtual learning environments. Therefore, those entering the unadista student community for the first time require induction systems and tools that help their entry, adaptation, and transition to virtual training. Thus, an information system that supports the induction process of first time students focused on their transition from face-to-face to virtual training is needed. This information system must comply with two basic requirements: firstly, to be an online system that guides students in the first steps of their virtual training and, secondly, to help the university’s decision-making regarding the induction tools and the adaptation resource...
3
artículo
Publicado 2014
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The article begins by specifying the concepts of reason and thought, needed in scientific activity. Then develop the basic ideas of Aristotle, who was concerned to provide the scientific construction methods. Methods, the important thing is what kind of conclusion lead. Thus, the deduction that uses the syllogism leads to true conclusions, but the induction was always a concern for the kind of real conclusion to which it leads. Concerns arise from the ancient Greeks, the medieval and modern on the induction, since the positions of logicians and philosophers. Similarly, the article focuses on the problem of justification of induction, logically speaking (Hume and Mill), but also in the justification as data gather process for building cognitive structures (Whewell). Induction was always criticized and even eliminated by Popper, but scientists in the natural sciences defend it in its metho...
4
Publicado 2022
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The objective of this research work is as we already know, the teaching of grammar has been a quite complex topic for the teacher who teaches this subject, which is often not completely relevant when teaching the English language but at the same time very important in learning a foreign language.In fact, the language has had and has variations in teaching methods and approaches when it you eat grammar. As we know, there are some difficulties in teaching the language effectively, especially to people who have English as a second language. Grammar is an important component of any language as it involves the use of rules to achieve language understanding goals and the language itself. For this reason, it is important to know the teaching process of teachers regarding the grammar that learning a new language details.
5
artículo
Drought is one of the main limitations of agricultural productivity and food security, in Andean mountain. The use of atmospheric nitrogen-fixing rhizobia in symbiosis with legumes, and tolerant to a wide range of adverse conditions, such as drought, is a great potential in sustainable agriculture. The aim of this review is to compile studies about drought stress effect on the legume-rhizobia symbiosis and rhizobia mechanisms to induce drought tolerance in legumes. The search for information was conducted from August to December 2020, using key terms. The drought effect on the nodulation and atmospheric nitrogen fixation process is made known, as well as the rhizobia ability to synthesize exopolysaccharides, enzymes, phytohormones, siderophores, osmolytes and solubilize phosphates as induction mechanisms to mitigate drought stress in legumes. This review will serve to propose future...
6
artículo
Drought is one of the main limitations of agricultural productivity and food security, in Andean mountain. The use of atmospheric nitrogen-fixing rhizobia in symbiosis with legumes, and tolerant to a wide range of adverse conditions, such as drought, is a great potential in sustainable agriculture. The aim of this review is to compile studies about drought stress effect on the legume-rhizobia symbiosis and rhizobia mechanisms to induce drought tolerance in legumes. The search for information was conducted from August to December 2020, using key terms. The drought effect on the nodulation and atmospheric nitrogen fixation process is made known, as well as the rhizobia ability to synthesize exopolysaccharides, enzymes, phytohormones, siderophores, osmolytes and solubilize phosphates as induction mechanisms to mitigate drought stress in legumes. This review will serve to propose future...
7
artículo
Field orientation control is a technique used in AC servo mechanisms that makes it possible to achieve a rapid torque response because it is based on the interaction between flux and current as in a DC motor. An alternative for servo controlmechanisms in AC is the Direct Torque Control that represents an advance in the objective of improving the performance and reliability in the control of induction motors and is fundamentally based on the comparison of the instantaneous values of Torque and Flow, calculated from of its primary variables (stator voltage and current), with their respective reference values. The resulting Flow and Torque errors are processed by hysteresis controllers to then select the voltage to be applied, through the activation of the power switches of a three-phase voltage inverter. The selection criteria are made so that there is a rapid torque response and hig...
8
artículo
Publicado 2018
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The papaya (Carica papaya L.), Caricaceae, is an important crop for its high nutritional value and its medicinal and industrial applications, however, this crop has problems of pests and diseases, which requires research to obtain improved varieties of papaya. An alternative is the cultivation of anthers for which it is necessary to know their competence with the induction of calluses; with the stated objective of this experience was to determine the effect of naphthaleneacetic acid and 6-benzylaminopurine in the induction of embryogenic calluses in anthers of C. papaya L. var. criolla. The obtained buds were measured and grouped according to their length, to determine the state of development of the pollen grain and the microspore state was confirmed with the coloring of acetic carmine and HCl. Then the explants were subjected to a cold pretreatment (6 ° C) for 4 days, then ...
9
artículo
Publicado 2018
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The papaya (Carica papaya L.), Caricaceae, is an important crop for its high nutritional value and its medicinal and industrial applications, however, this crop has problems of pests and diseases, which requires research to obtain improved varieties of papaya. An alternative is the cultivation of anthers for which it is necessary to know their competence with the induction of calluses; with the stated objective of this experience was to determine the effect of naphthaleneacetic acid and 6-benzylaminopurine in the induction of embryogenic calluses in anthers of C. papaya L. var. criolla. The obtained buds were measured and grouped according to their length, to determine the state of development of the pollen grain and the microspore state was confirmed with the coloring of acetic carmine and HCl. Then the explants were subjected to a cold pretreatment (6 ° C) for 4 days, then ...
10
artículo
Publicado 2018
Enlace
Enlace
The papaya (Carica papaya L.), Caricaceae, is an important crop for its high nutritional value and its medicinal and industrial applications, however, this crop has problems of pests and diseases, which requires research to obtain improved varieties of papaya. An alternative is the cultivation of anthers for which it is necessary to know their competence with the induction of calluses; with the stated objective of this experience was to determine the effect of naphthaleneacetic acid and 6-benzylaminopurine in the induction of embryogenic calluses in anthers of C. papaya L. var. criolla. The obtained buds were measured and grouped according to their length, to determine the state of development of the pollen grain and the microspore state was confirmed with the coloring of acetic carmine and HCl. Then the explants were subjected to a cold pretreatment (6 ° C) for 4 days, then ...
11
artículo
Publicado 2018
Enlace
Enlace
The papaya (Carica papaya L.), Caricaceae, is an important crop for its high nutritional value and its medicinal and industrial applications, however, this crop has problems of pests and diseases, which requires research to obtain improved varieties of papaya. An alternative is the cultivation of anthers for which it is necessary to know their competence with the induction of calluses; with the stated objective of this experience was to determine the effect of naphthaleneacetic acid and 6-benzylaminopurine in the induction of embryogenic calluses in anthers of C. papaya L. var. criolla. The obtained buds were measured and grouped according to their length, to determine the state of development of the pollen grain and the microspore state was confirmed with the coloring of acetic carmine and HCl. Then the explants were subjected to a cold pretreatment (6 ° C) for 4 days, then ...
12
artículo
Publicado 2020
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Physalis peruviana L. "aguaymanto" is a Solanaceae highly prized in countries such as Peru, Colombia and Ecuador due to its high nutritional value and numerous medicinal properties. Its cultivation has high variability because it is propagated by seeds, which makes it necessary to maintain its homogeneous morphological and productive characteristics. An alternative is in vitro micropropagation to subsequently achieve its technification and industrialization. Therefore, the objective of this work was to induce shoots and roots in hypocotyls and cotyledons of P. peruviana L. using auxins and cytokinins. Nine combinations were made between the concentrations of 2,4-D (0.25, 0.5 and 1.0 mg / l) and BAP (0.1, 0.25 and 1.0 mg / l), in which 20-day-old explants were introduced. The basal medium was that of Murashige & Skoog supplemented with 3% sucrose, phytagel (0.5%) and pH 6. After 70 da...
13
artículo
Publicado 2020
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Physalis peruviana L. "aguaymanto" is a Solanaceae highly prized in countries such as Peru, Colombia and Ecuador due to its high nutritional value and numerous medicinal properties. Its cultivation has high variability because it is propagated by seeds, which makes it necessary to maintain its homogeneous morphological and productive characteristics. An alternative is in vitro micropropagation to subsequently achieve its technification and industrialization. Therefore, the objective of this work was to induce shoots and roots in hypocotyls and cotyledons of P. peruviana L. using auxins and cytokinins. Nine combinations were made between the concentrations of 2,4-D (0.25, 0.5 and 1.0 mg / l) and BAP (0.1, 0.25 and 1.0 mg / l), in which 20-day-old explants were introduced. The basal medium was that of Murashige & Skoog supplemented with 3% sucrose, phytagel (0.5%) and pH 6. After 70 da...
14
artículo
Publicado 2020
Enlace
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Physalis peruviana L. "aguaymanto" is a Solanaceae highly prized in countries such as Peru, Colombia and Ecuador due to its high nutritional value and numerous medicinal properties. Its cultivation has high variability because it is propagated by seeds, which makes it necessary to maintain its homogeneous morphological and productive characteristics. An alternative is in vitro micropropagation to subsequently achieve its technification and industrialization. Therefore, the objective of this work was to induce shoots and roots in hypocotyls and cotyledons of P. peruviana L. using auxins and cytokinins. Nine combinations were made between the concentrations of 2,4-D (0.25, 0.5 and 1.0 mg / l) and BAP (0.1, 0.25 and 1.0 mg / l), in which 20-day-old explants were introduced. The basal medium was that of Murashige & Skoog supplemented with 3% sucrose, phytagel (0.5%) and pH 6. After 70 da...
15
artículo
Publicado 2020
Enlace
Enlace
Physalis peruviana L. "aguaymanto" is a Solanaceae highly prized in countries such as Peru, Colombia and Ecuador due to its high nutritional value and numerous medicinal properties. Its cultivation has high variability because it is propagated by seeds, which makes it necessary to maintain its homogeneous morphological and productive characteristics. An alternative is in vitro micropropagation to subsequently achieve its technification and industrialization. Therefore, the objective of this work was to induce shoots and roots in hypocotyls and cotyledons of P. peruviana L. using auxins and cytokinins. Nine combinations were made between the concentrations of 2,4-D (0.25, 0.5 and 1.0 mg / l) and BAP (0.1, 0.25 and 1.0 mg / l), in which 20-day-old explants were introduced. The basal medium was that of Murashige & Skoog supplemented with 3% sucrose, phytagel (0.5%) and pH 6. After 70 da...
16
artículo
Publicado 2020
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The technique of lost wax cast by induction centrifugation (CPCI) and selective laser fusion (SLM) in design and computer- aided manufacturing (CAD / CAM) with clinical scanning, are techniques for manufacturing cobalt-chromium copings (Co-Cr), have different production processes. Objective: To evaluate, in vitro, the marginal and internal adaptation of Co- Cr metal copings made on a chamfer termination line with the CPCI and SLM technique in CAD / CAM with clinical scanning. Material and Methods: A master model of Co-Cr premolar shape was made in CAD / CAM with chamfer termination line. With a clinical scanner, the master model was scanned and 13 Co-Cr copings manufactured in SLM were obtained. Impressions were taken to obtain models in type IV plaster where 13 Co-Cr copings with CPCI technique were manufactured. The marginal and internal adaptation was evaluated using the silicone rep...
17
artículo
Publicado 2012
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This present study of experimental design had as aim determines the anti-inflammatory effect of Oenothera rosea (Yawar socco) in rats which were induced acute and chronic inflammation. The whole plant was dried at 38 °C in an oven with circulating air, ground and macerated with a mix ethanol/water (70:30)1. It was used winter experimental model to evaluate the acute state (subplantar edema) induced with carrageenan and the model of xylene-induced edema ear. To determine the chronic inflammatory activity was used the model of carrageenan-induced granuloma using a modification of the technique described by Sedwick and Lees. It was used 132 albino rats of 300 g randomly divided in groups of eight each, one whereas a control with saline solution 5 mL/kg, one with the agent that induces inflammation (AI), AI groups and extract in 3 doses also with dexamethasone and ibuprofen, being 56 rats f...
18
artículo
In this study the work of induction of microbial carbonate genesis was carried out in order to obtain an improvement in the consolidation of the materials used in construction such as mortars and paving stones, in order to confer them greater resistance and conservation. As a result of the tests carried out, it was found that the inclusion of a bacterial biomass culture formed by bacteria of the genus Bacillus sp., in the formulation of the mortar and paving stones, helped to increase the resistance to compression with Fc values. 266.3 kg/cm2 higher compared to the control of Fc 261.0 kg/cm2. Also, the state of aggregation of the particles improved remarkably, we observed that in the fragmentation tests the structures showed a geometrically more homogeneous grid, compared with the cobbles of the control test. Regarding the texture and roughness aspects, it was proved that the paving ston...
19
artículo
In this study the work of induction of microbial carbonate genesis was carried out in order to obtain an improvement in the consolidation of the materials used in construction such as mortars and paving stones, in order to confer them greater resistance and conservation. As a result of the tests carried out, it was found that the inclusion of a bacterial biomass culture formed by bacteria of the genus Bacillus sp., in the formulation of the mortar and paving stones, helped to increase the resistance to compression with Fc values. 266.3 kg/cm2 higher compared to the control of Fc 261.0 kg/cm2. Also, the state of aggregation of the particles improved remarkably, we observed that in the fragmentation tests the structures showed a geometrically more homogeneous grid, compared with the cobbles of the control test. Regarding the texture and roughness aspects, it was proved that the paving ston...
20
artículo
The purpose of this article is to establish the processes of the modern Latin American tragic hero in four novels by the writer Gabriel García Márquez: One Hundred Years of Solitude, Love in the Time of Cholera, Of Love and Other Demons, and Chronicle of a Death Foretold. To this end, their relationship with the period and historical context was identified. Based on different analyses and texts that describe the characteristics of archiving and narratology: the historical in literature, the registry, and the archive. The methods employed were inductive-deductive, narratology, historical analysis, and hermeneutics, through which the research hypothesis was demonstrated: that the process of the tragic hero in Latin America is closely related to the historical context and the construction of identity, as evidenced by the results. In conclusion, the simultaneous study of the novels with th...
