BA. Grupos de Investigaciónhttps://repositorio.ufps.edu.co/handle/ufps/552024-03-28T20:44:29Z2024-03-28T20:44:29ZIn Vitro antifungal activity of ethanol extracts from Cnidoscolus urens L. in controlling Colletotrichum spp. in Lycopersicum esculentum: a sustainable agricultural perspectiveCarrillo, Maria FernandaMora Estupiñan, Daniela AlejandraOrtiz, LuzChaves-Bedoya, Giovannihttps://repositorio.ufps.edu.co/handle/ufps/67682024-03-23T08:00:40Z2023-05-01T00:00:00ZIn Vitro antifungal activity of ethanol extracts from Cnidoscolus urens L. in controlling Colletotrichum spp. in Lycopersicum esculentum: a sustainable agricultural perspective
Carrillo, Maria Fernanda; Mora Estupiñan, Daniela Alejandra; Ortiz, Luz; Chaves-Bedoya, Giovanni
Anthracnose, caused by the pathogenic fungi Colletotrichum spp., poses a significant threat to table tomato (Lycopersicum esculentum) cultivation. This study delves into the potential of plant extracts from Cnidoscolus urens L. as an alternative biocontrol strategy to combat this disease. Rich in secondary metabolites like terpenes, which are instrumental in plant defense, these extracts also comprise esters and fatty acids. Although the latter are not classified as secondary metabolites, they contribute significantly to the plant's biochemical makeup. Our objective was to gauge the in vitro inhibitory efficacy of ethanolic extracts derived from the leaves and stems of Cnidoscolus urens L. against Colletotrichum spp. To achieve this, an agar dilution method with varying extract concentrations was employed. The results showed that concentrations ranging from treatment 3 to treatment 8 effectively inhibited fungal mycelial growth. Interestingly, the extracts' origin, whether from leaves or stems, did not show any significant differential impact on their inhibitory activity. These insights emphasize the consistent effect of Cnidoscolus urens L. extracts in stalling Colletotrichum spp. growth, underscoring their potential as biological antifungal agents in agriculture. Given the pronounced in vitro effectiveness of both leaf and stem extracts, they beckon further exploration as part of sustainable agricultural strategies to combat prominent diseases like anthracnose.
2023-05-01T00:00:00ZImpact of Biomass Drying Process on the Extraction Efficiency of C-PhycoerythrinVergel Suarez, Ariadna HazelGarcía-Martinez, JanetLópez Barrera, German LucianoBarajas Solano, andres FZUORRO, Antoniohttps://repositorio.ufps.edu.co/handle/ufps/67662024-03-23T08:00:41Z2023-04-23T00:00:00ZImpact of Biomass Drying Process on the Extraction Efficiency of C-Phycoerythrin
Vergel Suarez, Ariadna Hazel; García-Martinez, Janet; López Barrera, German Luciano; Barajas Solano, andres F; ZUORRO, Antonio
Drying the biomass produced is one of the critical steps to avoid cell degradation; however,
its high energy cost is a significant technological barrier to improving this type of bioprocess’s
technical and economic feasibility. This work explores the impact of the biomass drying method of
a strain of Potamosiphon sp. on the extraction efficiency of a phycoerythrin-rich protein extract. To
achieve the above, the effect of time (12–24 h), temperature (40–70 ◦C), and drying method (convection oven and dehydrator) were determined using an I-best design with a response surface. According to the statistical results, the factors that most influence the extraction and purity of phycoerythrin are temperature and moisture removal by dehydration. The latter demonstrates that gentle drying of the biomass allows removing the most significant amount of moisture from the biomass without
affecting the concentration or quality of temperature-sensitive proteins.
2023-04-23T00:00:00ZRedes sociodigitales y saberes colectivos de los venezolanos en BogotáPeña Garnica, Diego FernandoEspinel Rubio, Gladys Adrianahttps://repositorio.ufps.edu.co/handle/ufps/67632024-03-23T08:00:56Z2023-08-01T00:00:00ZRedes sociodigitales y saberes colectivos de los venezolanos en Bogotá
Peña Garnica, Diego Fernando; Espinel Rubio, Gladys Adriana
El objetivo del estudio es reconocer las dinámicas de redes y saberes colectivos dentro de la comunidad migrante venezolana en Bogotá (Colombia) durante la pandemia por COVID-19. Desde una perspectiva mixta exploratoria, en la que convergen la observación focalizada, la encuesta y
la entrevista, fue posible analizar el flujo de contenidos en las redes sociodigitales, las visiones de expertos en atención a población migrante y las realidades de esta comunidad.
Se comprobó que las redes administradas por ellos se configuran en una infraestructura comunicativa bidireccional y permanente que les permite intercambiar conocimientos prácticos a través de la inteligencia colectiva, logrando su supervivencia, no solo frente a la pandemia, sino en relación
con su salud mental y sus medios de vida durante el confinamiento físico obligatorio.
2023-08-01T00:00:00ZA Modified Radiopropagation Multipath Model for Constant Refractivity Gradient ProfilesParada Rozo, Diego AndresRego, CassioGuevara-Ibarra, DinaelNavarro, AndresRamos, GlaucioOliveira, Rodrigohttps://repositorio.ufps.edu.co/handle/ufps/67612024-03-23T08:00:18Z2023-06-01T00:00:00ZA Modified Radiopropagation Multipath Model for Constant Refractivity Gradient Profiles
Parada Rozo, Diego Andres; Rego, Cassio; Guevara-Ibarra, Dinael; Navarro, Andres; Ramos, Glaucio; Oliveira, Rodrigo
This paper presents a radiopropagation algorithm based on a Ray Tracing (RT) technique that combines a modified multipath model for constant refractivity gradient profiles and the Uniform Theory of Diffraction (UTD). A novel formulation is proposed by the authors for calculation and ground-reflection analysis of ray paths depending on atmospheric refractivity. The algorithm introduced herein was evaluated in a mixed scenario and in two more realistic case studies, under conditions of constant refractivity gradient and lossy terrain profiles. Pathloss results are obtained and compared with Parabolic Equation (PE) numerical solution results at 2.0 GHz, 3.5 GHz and 5.4 GHz. In such conditions, the modified radiopropagation multipath algorithm with atmospheric refractivity introduced herein showed satisfactory results.
2023-06-01T00:00:00Z