Generación de Nuevo Conocimiento

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2008-2017 Bogota River Water Quality Assessment Based on the Water Quality Index
(MDPI Open Access Publishing, 2019) Diaz Casallas, Deissy Melina; Castro Fernandez, Mario Fernando; Gonzalez, Ruben
This article provides a deep analysis of the water quality at the upper basin of the Bogota River (Colombia) between 2008 and 2017. The Water Quality Index has been the indicator employed to determine the ecological status of the river.
A 6-amino acid insertion/deletion polymorphism in the mucin domain of TIM-1 confers protections against HIV-1 infection
(Elsevier Masson SAS, 2017) Biasin M.; Sironi M.; Saulle I.; Pontremoli C.; Garziano M.; Cagliani R.; Trabattoni D.; Lo Caputo S.; Vichi F.; Mazzotta F.; Forni D.; Riva S.; Aguilar-Jimenez W.; Cedeño S.; Sanchez J.; Brander C.; Zapata Builes, Wildeman; Rugeles M.T.; Clerici M.
We investigated whether a 6-amino acid insertion/deletion polymorphism in the mucin domain of TIM-1 (T-cell immunoglobulin and mucin domain 1), modulates susceptibility to HIV-1 infection. The polymorphism was genotyped in three case/control cohorts of HIV-1 exposed seronegative individuals (HESN) and HIV-1 infected subjects from Italy, Peru, and Colombia; data from a Thai population were retrieved from the literature. Across all cohorts, homozygosity for the short TIM-1 allele was more common in HESNs than in HIV-1 infected subjects. A meta-analysis of the four association analyses yielded a p value of 0.005. In vitro infection assays of CD4+ T lymphocytes indicated that homozygosity for the short allele is associated with lower rate of HIV-1 replication. These results suggest that the deletion allele protects from HIV-1 infection with a recessive effect. © 2016 Institut Pasteur
A 6-amino acid insertion/deletion polymorphism in the mucin domain of TIM-1 confers protections against HIV-1 infection
(Elsevier Masson SAS, 01/01/2017) Biasin M.; Sironi M.; Saulle I.; Pontremoli C.; Garziano M.; Cagliani R.; Trabattoni D.; Lo Caputo S.; Vichi F.; Mazzotta F.; Forni D.; Riva S.; Aguilar-Jimenez W.; Cedeño S.; Sanchez J.; Brander C.; Zapata Builes, Wildeman; Rugeles M.T.; Clerici M.
We investigated whether a 6-amino acid insertion/deletion polymorphism in the mucin domain of TIM-1 (T-cell immunoglobulin and mucin domain 1), modulates susceptibility to HIV-1 infection. The polymorphism was genotyped in three case/control cohorts of HIV-1 exposed seronegative individuals (HESN) and HIV-1 infected subjects from Italy, Peru, and Colombia; data from a Thai population were retrieved from the literature. Across all cohorts, homozygosity for the short TIM-1 allele was more common in HESNs than in HIV-1 infected subjects. A meta-analysis of the four association analyses yielded a p value of 0.005. In vitro infection assays of CD4+ T lymphocytes indicated that homozygosity for the short allele is associated with lower rate of HIV-1 replication. These results suggest that the deletion allele protects from HIV-1 infection with a recessive effect. © 2016 Institut Pasteur
A collaborative programme in sustainability and social responsibility
(Emerald Group Publishing Ltd., 2016) Albareda Tiana S.; Alferez Villarreal, Azul
Purpose: The purpose of this paper is to collect methodological strategies used in the training of future teachers to develop competences in sustainability and social responsibility (SSR). The proposal in this paper is to show how students learn and develop competences by performing practical activities and through a collaborative experience, conducted in a real-life context in the university campus. Design/methodology/approach: This paper collects together a selection of competences and sub-competences in SSR, together with the methodological scenarios that allowed their implementation. The results in the acquisition of competences, as well as the efficiency of the methodological strategies employed, were obtained from the qualitative analysis of student questionnaires and of their final academic results. Findings: Changing the teaching methods to include collaborative methodological strategies facilitates the acquisition of SSR competences. Research limitations/implications: A methodological limitation of this study is the fact that it has taken place in one academic year. The authors realize that to provide evidence of a profound behavioural change (which goes beyond the improvement of a habit), there is a need to carry out a longer study, which is complex when working with final year students. The authors are suggesting that the University carry out prolonged studies on the implementation and assessment of competences in SSR in the University and afterwards in the work place. Practical implications: At the start of the course year, a problem was identified, namely, that future teachers lacked sustainable habit patterns. This was turned into a learning opportunity that led to a collaborative SSR programme on the campus. Social implications: Creating varied practical methodological scenarios has contributed to the development of SSR competences by the pupils. Students have questioned their lifestyles and have modified their consumption habits. Additionally, doing a transdisciplinary collaborative programme in our own campus has played a part in changing our organization for the better and has facilitated combining research and teaching. Originality/value: This paper helps clarify how SSR competences can be developed in a local, real-life context. © 2016, © Emerald Group Publishing Limited.
A Comparative Analysis of Heuristics Applied to Collecting Used Lubricant Oils Generated in the City of Pereira, Colombia
(World Academy of Science Engineering and Technology, 2016) Fajardo Solarte, Diana Stefany; Herrera, Oscar; Santis Navarro, Angelicà Marìa
A Comparative Analysis of Heuristics Applied to Collecting Used Lubricant Oils Generated in the City of Pereira, Colombia
(World Academy of Science Engineering and Technology, 01/12/2016) Fajardo Solarte, Diana stefany; Santis Navarro, Angelicà marìa
A Comparison of Traditional and Geometric Morphometric Techniques for the Study of Basicranial Morphology in Horses: A Case Study of the Araucanian Horse from Colombia
(MDPI, 2020) Parés-Casanova P.M.; Salamanca Carreño, Arcesio; Crosby Granados, René Alejandro; Bentez Molano, Janeth
Skull size and shape have been widely used to study domestic animal populations and breeds. Although several techniques have been proposed to quantify cranial form, few attempts have been made to compare the results obtained by different techniques. While linear morphometrics has traditionally been used in breed characterization, recent advances in geometric morphometrics have created new techniques for specifically quantifying shape and size. The objective of this study was to compare two morphometric methods for their ability to describe external morphology. For this purpose, 20 skull specimens of adult male Araucanian horses were examined. Two age categories were established (the “mature group”, M3 not fully erupted to moderately worn, n = 7; and the “senile group”, M3 totally erupted and highly worn, n = 13). Both methods showed that there were statistical differences between generations, but discrimination rates were different between methods with the geometric morphometric analysis obtaining a rate of 97.5%. Although linear morphometrics was found to be compatible with geometric morphometrics, the latter was better able to discriminate the two groups and it also provides more information on shape. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
A Comparison of Traditional and Geometric Morphometric Techniques for the Study of Basicranial Morphology in Horses: A Case Study of the Araucanian Horse from Colombia
(MDPI, 10/01/2020) Parés-Casanova P.M.; Salamanca Carreño, Arcesio; Crosby Granados, René Alejandro; Bentez Molano, Janeth
Skull size and shape have been widely used to study domestic animal populations and breeds. Although several techniques have been proposed to quantify cranial form, few attempts have been made to compare the results obtained by different techniques. While linear morphometrics has traditionally been used in breed characterization, recent advances in geometric morphometrics have created new techniques for specifically quantifying shape and size. The objective of this study was to compare two morphometric methods for their ability to describe external morphology. For this purpose, 20 skull specimens of adult male Araucanian horses were examined. Two age categories were established (the “mature group”, M3 not fully erupted to moderately worn, n = 7; and the “senile group”, M3 totally erupted and highly worn, n = 13). Both methods showed that there were statistical differences between generations, but discrimination rates were different between methods with the geometric morphometric analysis obtaining a rate of 97.5%. Although linear morphometrics was found to be compatible with geometric morphometrics, the latter was better able to discriminate the two groups and it also provides more information on shape. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
A critical techno-economic analysis of coffee processing utilizing a modern fermentation system: Implications for specialty coffee production
(Universidad Cooperativa de Colombia, campus Pasto. Ingeniería Industrial, 2021) Coral Medina, Jesus David; Magalhaes, Antonio; Dao Pedro, de Carvalho Neto; Gilberto, Melo Pereira; Alexandre , da Silva; Julio, de carvalho; Carlos Ricardo, Soccol
Fermentation is an important step in coffee processing which promotes the removal of mucilage adhering to the fruits. This process has a direct impact on the coffee quality, and the use of bioreactors and starter cultures has been suggested for process control. In this study, a techno-economic analysis was performed to assess the investment costs and economic performance of the inclusion of a stirred tank bioreactor (STB) model and starter cultures into a coffee processing plant. The total capital investment and production costs for a 45-ton capacity coffee farm operating with 2 STB were US$ 1 million and 0.74 $/kg higher, respectively, than the conventional processing using open tanks. The main factors for rising costs included the implementation of bioreactors (73% of the equipment costs) and starter cultures (88% of the production costs). However, the modern fermentation system (STB with the use of starter cultures) enables the production of specialty coffee beverages with scores among 85.5 and 91.5, which can be sold at 15.50 and 40.92 $/kg, respectively—more than sixteen times the estimated price for commodity coffee. Thus, the techno-economic analysis showed a viable and extremely favorable scenario, providing the economic support for the modernization of coffee fermentation and to value co-creation in the specialty coffee chain
A new electromagnetic model for determining the speed of photon absorption in a photocatalytic process for wastewater treatment
(Italian Association of Chemical Engineering - AIDIC, 2019) Ramos Borda, German Ernesto; Santis Navarro, Angelicà Marìa; Velasquez Perilla, Pablo Elias; Acevedo Pabon, Paola Andrea; Rincon J.; Cabeza I.
In the following work a new mode of operation is presented, as a continuation of the research developed on the elaboration of an electromagnetic model for the determination of the speed of photonic absorption in a solar collector in V (V - collector) (Ramos et al. 2017). The electromagnetic characteristics of the fluid in the suspension will be studied, such as electric permittivity, magnetic permeability, electrical conductivity and frequency of incident light. Likewise, the time variable is included as the innovation in the model to obtain the factors of the phase and the attenuation of the electromagnetic wave that penetrates the suspending medium and the photocatalytic process. For the model, an opto-geometric analysis of the V collector was used, which was studied and contrasted with the literature (Bandala et al. 2004). Copyright © 2019, AIDIC Servizi S.r.l.
A new electromagnetic model for determining the speed of photon absorption in a photocatalytic process for wastewater treatment
(Italian Association of Chemical Engineering - AIDIC, 31/05/2019) Ramos Borda, German ernesto; Santis Navarro, Angelicà marìa; Velasquez Perilla, Pablo elias; Acevedo Pabon, Paola andrea; Rincon J.; Cabeza I.
In the following work a new mode of operation is presented, as a continuation of the research developed on the elaboration of an electromagnetic model for the determination of the speed of photonic absorption in a solar collector in V (V - collector) (Ramos et al. 2017). The electromagnetic characteristics of the fluid in the suspension will be studied, such as electric permittivity, magnetic permeability, electrical conductivity and frequency of incident light. Likewise, the time variable is included as the innovation in the model to obtain the factors of the phase and the attenuation of the electromagnetic wave that penetrates the suspending medium and the photocatalytic process. For the model, an opto-geometric analysis of the V collector was used, which was studied and contrasted with the literature (Bandala et al. 2004). Copyright © 2019, AIDIC Servizi S.r.l.
A novel approach to create an antibacterial surface using titanium dioxide and a combination of dip-pen nanolithography and soft lithography
(Nature Publishing Group, 2018) Arango Santander, Santiago; Pelaez Vargas, Alejandro; Da Cunha Freitas, Sidonio Ricardo; García González, Claudia Patricia
Soft lithography and Dip-Pen Nanolithography (DPN) are techniques that have been used to modify the surface of biomaterials. Modified surfaces play a role in reducing bacterial adhesion and biofilm formation. Also, titanium dioxide has been reported as an antibacterial substance due to its photocatalytic effect. This work aimed at creating patterns on model surfaces using DPN and soft lithography combined with titanium dioxide to create functional antibacterial micropatterned surfaces, which were tested against Streptococcus mutans. DPN was used to create a master pattern onto a model surface and microstamping was performed to duplicate and transfer such patterns to medical-grade stainless steel 316L using a suspension of TiO2. Modified SS316L plates were subjected to UVA black light as photocatalytic activator. Patterns were characterized by atomic force microscopy and biologically evaluated using S. mutans. A significant reduction of up to 60% in bacterial adhesion to TiO2 -coated and -micropatterned surfaces was observed. Moreover, both TiO2 surfaces reduced the viability of adhered bacteria after UV exposure. TiO2 micropatterned demonstrated a synergic effect between physical and chemical modification against S. mutans. This dual effect was enhanced by increasing TiO2 concentration. This novel approach may be a promising alternative to reduce bacterial adhesion to surfaces. © 2018, The Author(s).
A novel approach to create an antibacterial surface using titanium dioxide and a combination of dip-pen nanolithography and soft lithography
(Nature Publishing Group, 25/10/2018) Arango Santander, Santiago; Pelaez Vargas, Alejandro; Da cunha Freitas, Sidonio ricardo; García González, Claudia patricia
Soft lithography and Dip-Pen Nanolithography (DPN) are techniques that have been used to modify the surface of biomaterials. Modified surfaces play a role in reducing bacterial adhesion and biofilm formation. Also, titanium dioxide has been reported as an antibacterial substance due to its photocatalytic effect. This work aimed at creating patterns on model surfaces using DPN and soft lithography combined with titanium dioxide to create functional antibacterial micropatterned surfaces, which were tested against Streptococcus mutans. DPN was used to create a master pattern onto a model surface and microstamping was performed to duplicate and transfer such patterns to medical-grade stainless steel 316L using a suspension of TiO2. Modified SS316L plates were subjected to UVA black light as photocatalytic activator. Patterns were characterized by atomic force microscopy and biologically evaluated using S. mutans. A significant reduction of up to 60% in bacterial adhesion to TiO2 -coated and -micropatterned surfaces was observed. Moreover, both TiO2 surfaces reduced the viability of adhered bacteria after UV exposure. TiO2 micropatterned demonstrated a synergic effect between physical and chemical modification against S. mutans. This dual effect was enhanced by increasing TiO2 concentration. This novel approach may be a promising alternative to reduce bacterial adhesion to surfaces. © 2018, The Author(s).
A PROPOSAL FOR EDUCATIONAL ARTICULATION BASED ON THE CONCEPTS OF COLLABORATIVE NETWORK ENTREPRENEURSHIP
(Universidad Cooperativa de Colombia, Facultad de Ciencias Económicas, Administrativas y Contables, Administración de Empresas, Ibagué, 2023-07-14) Rodríguez Barrero, Mario Samuel ; Mosquera Rodas, Jhon Jairo; Hoyos Parra, Juan Carlos
The objective of this research is to generate a proposal for educational articulation based on the concepts of collaborative network entrepreneurship based on the concept of entrepreneurship, to propose the structure of a network of school entrepreneurship that facilitates the process of articulation of technical secondary education with the university, generating an integrated model based on the postulates of (Varela, 2001), (Valdés, 2000) and (Schvarstein, 2008). The methodology is of a quantitative descriptive nature, analysing the state of entrepreneurship in 51 official secondary schools in the city of Pereira. The most relevant results were that a significant number of secondary schools do not adequately develop entrepreneurship programmes and articulation with university education and the proposal of a flexible model for the articulation of universities with secondary education. With regard to the conclusions, the process of integration of an entrepreneurship network is presented in order to develop ways of articulation between secondary and higher education, which is recognised as a valid strategy and as a means of overcoming the difficulties encountered.
A Simple Method of Water Purification and Energy Extraction from Organic Wastewater: an Application of Green Chemistry Principles in Everyday Life
(Journal of Science Education, 2015) Colmenares Quintero, Juan Carlos; Arévalo García, Enzo; Colmenares Quintero, Ramón Fernando
A Simple Method of Water Purification and Energy Extraction from Organic Wastewater: an Application of Green Chemistry Principles in Everyday Life
(Journal of Science Education, 01/01/2015) Colmenares Quintero, Juan Carlos; Arévalo García, Enzo; Colmenares Quintero, Ramón Fernando
A Simulation Model for the Attention to Users in Emergency Situations in the City of Bogotá
(Springer Verlag, 2018) Mendez Giraldo, Germán; López Santana, Eduyn; Suarez Roldan, Carolina
A simulation model is presented for the attention to users in emergency situations in Bogota. This system is vital importance for the development, security and stability of the city. The simulation process begins with an intelligence model that allows acquiring the knowledge of complex process of attention of users and understanding relationships among resources which attend emergencies. This system is managed by Emergency Regulatory Center (ERC) assigned to the District Health Secretary. Within the results achieved, it is possible to obtain an improvement in measures of performance such as average time in the system and the average time blocked which show an inadequate level service because they are result of excessive time in waiting calls and the subsequent system exit. Different scenarios were proposed in order to increase reception capacity of the incidents in the activation system’s phase, which is equivalent to increase the technicians auxiliaries of regulatory medical (TARM) and of the regulatory doctor (RD). © 2018, Springer Nature Switzerland AG.
A Simulation Model for the Attention to Users in Emergency Situations in the City of Bogotá
(Springer Verlag, 19/10/2018) Suarez Roldan, Carolina
A simulation model is presented for the attention to users in emergency situations in Bogota. This system is vital importance for the development, security and stability of the city. The simulation process begins with an intelligence model that allows acquiring the knowledge of complex process of attention of users and understanding relationships among resources which attend emergencies. This system is managed by Emergency Regulatory Center (ERC) assigned to the District Health Secretary. Within the results achieved, it is possible to obtain an improvement in measures of performance such as average time in the system and the average time blocked which show an inadequate level service because they are result of excessive time in waiting calls and the subsequent system exit. Different scenarios were proposed in order to increase reception capacity of the incidents in the activation system’s phase, which is equivalent to increase the technicians auxiliaries of regulatory medical (TARM) and of the regulatory doctor (RD). © 2018, Springer Nature Switzerland AG.
A Solution to Manage the Full Life Cycle of Learning Analytics in a Learning Management System: AnalyTIC
(Education Society of IEEE (Spanish Chapter), 2019) Simanca Herrera, Fredys Alberto; Crespo R.G.; Baena L.R.; Burgos D.
Learning Analytics (LA) has a significant impact in learning and teaching processes. These processes can be improved using the available data retrieved from students' activity inside the virtual classrooms of a learning management system (LMS). This process requires the development of a tool that allows one to handle the retrieved information properly. This paper presents a solution to this need, in the form of a development model and actual implementation of an LA tool. Four phases (Explanation, Diagnosis, Prediction and Prescription) are implemented in the tool, allowing a teacher to track students' activity in a virtual classroom via the Sakai LMS. It also allows for the identification of users who face challenges in their academic process and the initiation of personalised mentoring by the teacher or tutor. The use of the tool was tested on groups of students in an algorithms course in the periods 2017-1, 2017-2, 2018-1 and 2018-2, with a total of 90 students - in parallel with the control groups in the same periods that totalled 95 students - obtaining superior averages in the test groups versus the control groups, which evidenced the functionality and utility of the software. © 2013 IEEE.
A Solution to Manage the Full Life Cycle of Learning Analytics in a Learning Management System: AnalyTIC
(Education Society of IEEE (Spanish Chapter), 01/01/2019) Simanca Herrera, Fredys alberto; Crespo R.G.; Baena L.R.; Burgos D.
Learning Analytics (LA) has a significant impact in learning and teaching processes. These processes can be improved using the available data retrieved from students' activity inside the virtual classrooms of a learning management system (LMS). This process requires the development of a tool that allows one to handle the retrieved information properly. This paper presents a solution to this need, in the form of a development model and actual implementation of an LA tool. Four phases (Explanation, Diagnosis, Prediction and Prescription) are implemented in the tool, allowing a teacher to track students' activity in a virtual classroom via the Sakai LMS. It also allows for the identification of users who face challenges in their academic process and the initiation of personalised mentoring by the teacher or tutor. The use of the tool was tested on groups of students in an algorithms course in the periods 2017-1, 2017-2, 2018-1 and 2018-2, with a total of 90 students - in parallel with the control groups in the same periods that totalled 95 students - obtaining superior averages in the test groups versus the control groups, which evidenced the functionality and utility of the software. © 2013 IEEE.

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