BISTUA Revista de la Facultad de Ciencias Básicas
type: channel
description: BISTUA, the scientific journal of the Faculty of Basic Sciences at the University of Pamplona-Colombia, is dedicated to the dissemination of knowledge in natural and exact sciences. With a biannual frequency, it aims to contribute to scientific advancement by publishing original research results in areas such as Biology-Microbiology, Physics, Geology, Chemistry, Mathematics, and Applied Basic Sciences. The journal is aimed at researchers, academics, and professionals, both national and international, interested in these disciplines. It is an open-access, peer-reviewed journal that does not charge any fees for the submission or publication of articles. BISTUA provides a platform for the publication of scientific and technological research articles, review articles, and letters to the editor. Indexations: Latindex, Publindex, Dialnet, MIAR, Redalyc, EBSCO, BIBLAT, Others. Frequency: Biannual. Print ISSN: 0120-4211, Online ISSN: 2711-3027 Publindex Category: C
publisher: Departamento de Física, Facultad de Ciencias Básicas, Universidad de Pamplona
language: en
publication name: BISTUA Revista de la Facultad de Ciencias Básicas
issn: 0120-4211
copyright: © Autores; Licencia Universidad de Pamplona
items: Methods of 3D reconstruction by fringe projection: A comparative study
items: New records of Xylariales Macrofungi from the Tropical Dry Forest, Sucre Department, Colombia
items: Quantitative Determination of Periodic Size Variations in an Object via Phase Singularity Tracking in CGH
items: Water quality assessment and growth of red tilapia (Oreochromis sp.) and white cachama (Piaractus brachypomus) in earth ponds in Arauca, Colombia
items: Microplastics, the ubiquitous pollutant accompanying Climate Change: A bibliometric analysis of the context
items: Interferometric Migration and Modeling in VSP Configuration: Synthesizing Virtual Functions for Reflector Imaging
items: Ocean's microbial world, key to the health of marine organisms
items: Geological Evolution of the rodingites and associated rocks from the Cabo de La Vela mafic - ultramafic complex, Alta Guajira, Colombia
items: Productive efficiency of tilapia oreochromis sp Raised in geomembrane pond with biofloc and raceways technology
items: Nucleation and growth history of garnet in metamorphic rocks: 2D and 3D petrological insights
items: In vitro antagonistic activity of native Trichoderma strains against Botrytis sp
items: Antibacterial activity of a pigment produced by Serratia marcescens FCS2015 using peanut powder as a substrate and different glucose concentrations
items: Evaluation of the rate of utilization of organic substrates by microorganisms in fixed and suspended biomass in reactors that treat leachate from landfills
items: Molecular compatibility analysis between proteins and their inhibitors: a case study in the formulation of the monoclonal antibody 4trp
items: Integration of multiscale porosities and permeabilities in Paleogene reservoir rocks of the Middle Magdalena Valley Basin, Colombia
items: Efficiency and Spatial homogeneity of the SERS signal in plasmonic antennas: A study at the nano and micro scales
items: Epidemiological Characteristics of Polycystic Ovary Syndrome in a Population Attended at a University Hospital in Colombia
items: Bat Guano Carollia perspicillata is a source of Nitrogen Cycle Bacteria and its use as fertilizer
items: Real-Time Recording and Reconstruction of Holograms Integrating Optical and Digital Technology
items: Microbiological profile of paddy and commercial rice (Oryza sativa L) in the department of Norte de Santander, Colombia.
items: Approximation and Simulation of Signal Belonging to the Generalized Weighted Lipschitz Class by ...
items: Epidemiological profile of patients with malaria admitted to the Erasmo Meoz University Hospital in the municipality of Cúcuta, during the period 2014-2021
items: Bessel polynomials by context-free grammars
items: Microplastics in continental water sources: impact and mitigation strategies from the perspective of agroindustrial engineering
items: Power Aggregation Operators in MADM Problems Under Pythagorean Neutrosophic Numbers Based on Hamacher t-norm and t-conorm Operations
items: Evaluation of the Efficacy of a Micropropagation Protocol in Two Potato Varieties: Solanum tuberosum (Perla Negra) y Solanum phureja (Criolla Colombia)
items: Effect of Pinus patula (Pinaceae) plantations on soil and vegetation in the Rabanal moor, Samacá Boyacá
items: https://ojs.unipamplona.edu.co/bistua/article/view/2645
items: Introduction to actinic damage and actinomycetes as a promising source for eco-friendly photoprotective compounds
items: Association between virtual training during COVID-19 confinement and symptoms of depression, anxiety and stress in medical students in clinical practices post pandemic 2023

Methods of 3D reconstruction by fringe projection: A comparative study
type: item
description: This work proposes the design and construction of a three-dimensional reconstruction system based on fringe projection. The system is composed of a 752x480 pixels CMOS color camera and a DellM115HD mini-videobeam with LED illumination, these devices are located in triangulation configuration. An interface was developed in Matlab that controls the videobeam and the camera, which allows the capture of the images of the fringes projected on the sample automatically. In addition, some 3D reconstruction algorithms were implemented, such as: Phase Shifting (3, 4 and 5 images) and the Fourier transform phase analysis algorithm. In this work, a comparative analysis of accuracy and resolution of the methods is made, as well as advantages and disadvantages. Finally, reconstructions of various objects by the different algorithms implemented are presented.
subject: Paper
  topic: section
subject: Reconstrucción 3D, proyección de franjas, Transformada de Fourier, Phase shifting.
  topic: keywords
subject: Óptica
  topic: subjects
subject: OPTICA
  topic: disciplines
creator: Hosman-Yadir Gelvez-Ramirez
creator: Martha Lucia Molina Prado
creator: Néstor Alonso Arias Hernández
rights: Copyright (c) 2026 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2026-01-28
publication date: 2026-01-28
starting page: 1
ending page: 13
doi: 10.24054/6t2dej53

New records of Xylariales Macrofungi from the Tropical Dry Forest, Sucre Department, Colombia
type: item
description: Macrofungi from the order Xylariales are well-known for their presence in tropical regions, where they play crucial roles as decomposers of plant material within ecosystems. In the department of Sucre, knowledge about local fungal biodiversity remains in its early stages, and the Tropical Dry Forest ecosystem has particularly garnered limited attention in research focused on tropical macrofungi. This study aims to enhance knowledge of fungal diversity in the Montes de María natural region by identifying macrofungi species from the order Xylariales present in the area. Among these, six represent new records for Sucre, while two species—Xylaria mesenterica and Phylacia surinamensis—are newly recorded for Colombia. This research contributes to a greater understanding of the diversity of these species, both at the national level and within the context of the tropical dry forest.
subject: Paper
  topic: section
subject: Montes de María
  topic: keywords
subject: Ascomycota
  topic: keywords
subject: Colombian Caribbean
  topic: keywords
subject: Biology
  topic: subjects
subject: Mycology
  topic: disciplines
creator: Maria Claudia Ochoa Fajardo
creator: Hannya Andrea Chamorro Martínez
creator: Yulena Osorio Navarro
creator: Liliana Solano
rights: Copyright (c) 2026 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2026-05-04
publication date: 2026-05-04
starting page: 1
ending page: 7
doi: 10.24054/bistua.v23i2.4150

Quantitative Determination of Periodic Size Variations in an Object via Phase Singularity Tracking in CGH
type: item
description: In this work we demonstrate that it is possible to determine the size changes of an object from the tracking of optical vortices contained in the pseudophase information of computer generated holographic (CGH) videos, without the need for holographic reconstruction. To validate the proposal, holographic videos of a 3D object with periodic changes in size generated using a layer-based method with random phase. Two random phase approaches are tested to simulate the surface of a diffuse object during hologram generation. Next, homologous vortices are determined in the pseudophase information obtained by using the Laguerre-Gauss transform. The use of this transform allows precise control of the number of optical vortices to be tracked. The structural properties of the vortex cores are used to identified and to track the singularities and to determine the periodic variation of the object size along the frames of the holographic video.
subject: Paper
  topic: section
subject: Laguerre-Gauss transform; Optical vortices; Computer generated holographic.
  topic: keywords
subject: Research Outcome
  topic: subjects
subject: physics
  topic: disciplines
subject: Optics
  topic: disciplines
creator: Astrid Lorena Villamizar Amado
creator: Alejandro Velez Zea
creator: Myrian Tebaldi
rights: Copyright (c) 2025 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-06-20
publication date: 2025-06-20
starting page: 1
ending page: 8
doi: 10.24054/bistua.v23i1.4032

Water quality assessment and growth of red tilapia (Oreochromis sp.) and white cachama (Piaractus brachypomus) in earth ponds in Arauca, Colombia
type: item
description: In Colombia, polycultures are an important economic activity for food security and rural development, using together the species red tilapia (Oreochromis sp.) and white cachama (Piaractus brachypomus), this due to their adaptability to different aquatic conditions. Taking into account the knowledge gap in relation to water quality and biometric development of fish, the present study sought to determine the water quality index in polyculture and its relationship with the optimal development of the mentioned species. Four samples were taken, from each sample physicochemical data of the water and biometric data of 10 individuals were collected. It was calculated that there was a significant difference between the 4 samples in terms of physicochemical and biometric parameters, the Fulton condition index (K) was calculated where the cachama with a higher score contributes robustness to the hypothesis of considering a resistant species, the Spearman valuation determines that DO, ORP, and pH negatively affect development; On the other hand, the water quality index showed a considerable progressive improvement in the score, with sample 4 showing the best quality and an acceptable score. It can be concluded that acceptable water quality indices showed a direct positive association with better biometric performance, regardless of the species.
subject: Paper
  topic: section
subject: Biometrics, Correlation, Fulton, Physicochemical parameters, Polyculture
  topic: keywords
creator: Rafael Mauricio Hernández
creator: Hisnel Franco-Márquez
creator: Jorge Enrique Rangel-Soto
creator: Ingrid Berenice Florez-Villamizar
rights: Copyright (c) 2026 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2026-02-03
publication date: 2026-02-03
starting page: 1
ending page: 7
doi: 10.24054/bistua.v23i2.3800

Microplastics, the ubiquitous pollutant accompanying Climate Change: A bibliometric analysis of the context
type: item
description: The contamination of ecosystems by plastic fragments smaller than 5 mm in length (microplastics, MPs) and Climate Change (CC) threaten the health of terrestrial and aquatic ecosystems, biodiversity, and human existence. Because both phenomena occur simultaneously on a global scale, it is interesting to investigate whether they influence each other. Therefore, this study reviewed the state-of-the-art on the effect of MPs on CC and discussed the possible mechanisms that lead MPs to promote CC. To this end, a bibliometric analysis was conducted with publications from the Scopus database, and the discussion was complemented with information from relevant articles on the relationship between MPs and CC. The results showed that this is a developing field of knowledge, framed in five to seven clusters of study areas: sustainability, climate change and marine life, effects on organisms, components transported by MPs, methods for chemical characterization of MPs, and effects on human health. Moreover, most analyses of MPs-CC interactions are based on theoretical assumptions supported by limited empirical evidence, generally focusing on a single component. However, the few empirical studies linking the two events demonstrate that MPs pollution can intensify CC by inducing greenhouse gas (GHG) emissions through alterations in the biogeochemical cycles of water and sediments in aquatic and terrestrial ecosystems. These findings highlight the urgent need for experimental and field research to quantify and clarify the underlying mechanisms of the bidirectional interaction of MPs and CC with the environment.
subject: Paper
  topic: section
subject: Environmental pollution
  topic: keywords
subject: Biogeochemical cycles
  topic: keywords
subject: Network analysis
  topic: keywords
subject: Greenhouse gases
  topic: keywords
subject: Aquatic and terrestrial ecosystems
  topic: keywords
subject: environmental
  topic: subjects
subject: Earth sciences
  topic: disciplines
creator: Luis Parmenio Suescún Bolívar
creator: Natalia Carabantes
creator: Apolinar Santamaría-Miranda
rights: Copyright (c) 2025 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2026-01-28
publication date: 2026-01-28
starting page: 1
ending page: 9
doi: 10.24054/bistua.v23i2.3775

Interferometric Migration and Modeling in VSP Configuration: Synthesizing Virtual Functions for Reflector Imaging
type: item
description: Seismic interferometry is a technique that reconstructs subsurface images by cross-correlating seismic traces, leveraging the principles of acoustic wave interference propagating through the Earth. This approach generates virtual Green's functions between pairs of receivers, enabling the estimation of elastic properties and the morphology of subsurface layers. In reservoir exploration, obtaining high-resolution and accurate images is essential for geological interpretation and decision-making. Unlike traditional seismic methods, interferometry offers advantages such as reduced sensitivity to wavefield diffusivity and environmental noise. In this study, we present a numerical modeling of interferometric migration applied to synthetic geological structures, using a vertical seismic profile (VSP) configuration.
subject: Paper
  topic: section
subject: Seismic interferometry; Migration; Correlation
  topic: keywords
subject: Geophysics
  topic: subjects
subject: Seismic Migration
  topic: disciplines
creator: Helizain Pabón
creator: Jorge Enrique Rueda Parada
creator: Néstor Alonso Arias Hernández
rights: Copyright (c) 2025 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-05-26
publication date: 2025-05-26
starting page: 1
ending page: 7
doi: 10.24054/bistua.v23i1.3759

Ocean's microbial world, key to the health of marine organisms
type: item
description: Microscopic life in the oceans—including bacteria, archaea, viruses, fungi, protozoa, and microalgae—is essential for the health of marine ecosystems. These microorganisms form the microbiome, a community that establishes symbiotic relationships with organisms such as corals, sea anemones, and jellyfish of the phylum Cnidaria. In these cases, the host–microbiome complex is known as a holobiont, where microbes provide defense against pathogens, produce antimicrobial compounds, and supply nutrients that optimize host metabolism and physiology. This review explores the ecological role of the microbiome in cnidarians and its response to environmental stress. A key example is the symbiosis with microalgae of the family Symbiodiniaceae, which provide photosynthetic products that support the host’s energy needs. However, climate change and pollution disrupt this relationship, leading to bleaching, symbiont loss, and microbiome destabilization. These changes favor the proliferation of pathogenic bacteria and can ultimately result in cnidarian death. The use of anemones, corals, and jellyfish as model systems is highlighted to study these processes, including the decline of beneficial bacteria such as Endozoicomonas and the increase of opportunistic pathogens like Vibrio. The presence of key bacteria such as Ruegeria, even under stressful conditions, is also emphasized. Overall, the microbiome emerges as a sentinel of marine health, reflecting environmental shifts before visible damage occurs and offering tools for conservation in the face of global warming.
subject: Paper
  topic: section
subject: Marine microbiome
  topic: keywords
subject: Symbiosis
  topic: keywords
subject: Climate change
  topic: keywords
subject: 16S rRNA
  topic: keywords
subject: review
  topic: subjects
subject: microbiology
  topic: disciplines
subject: microbiome
  topic: disciplines
subject: bioinformatic
  topic: disciplines
subject: symbiosis
  topic: disciplines
creator: Natalia Carabantes
creator: Luis Parmenio Suescún Bolívar
rights: Copyright (c) 2025 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-05-27
publication date: 2025-05-27
starting page: 1
ending page: 9
doi: 10.24054/bistua.v23i1.3757

Geological Evolution of the rodingites and associated rocks from the Cabo de La Vela mafic - ultramafic complex, Alta Guajira, Colombia
type: item
description: At Cabo de La Vela, dikes, irregular massive bodies, pods, and banded masses of rodingite have been identified, indicating the presence of at least two distinct protoliths. Field relationships, petrographic analyses, and geochemical data allow differentiation between gabroic and hornblenditic protoliths, mainly evidenced by the occurrence of hydrogrossular and prehnite interacting within ultramafic and mafic serpentinites. This ophiolitic complex is strongly deformed within a mélange zone and underwent early mylonitization, which facilitated intense calcium metasomatism responsible for rodingite formation, as well as additional hydrothermal alterations such as uralitization and albitization associated with multiple elemental enrichments. The presence of minerals like prehnite and pumpellyite indicates low-grade metamorphism in the rocks of the complex.
subject: Paper
  topic: section
subject: Rodingites; Metasomatism; Serpentinization; Metamorphism; Peridotites; Ophiolitic Complexes.
  topic: keywords
creator: Enmanuel Arias
creator: Ingrid Peña
creator: Oscar Mauricio Castellanos-Alarcón
creator: Carlos Ríos
rights: Copyright (c) 2026 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2026-02-04
publication date: 2026-02-04
starting page: 1
ending page: 20
doi: 10.24054/bistua.v23i2.3754

Productive efficiency of tilapia oreochromis sp Raised in geomembrane pond with biofloc and raceways technology
type: item
description: The study compared the productive efficiency of red tilapia raised in geomembrane ponds with biofloc and raceways technology. Key physicochemical parameters in both systems were analyzed, highlighting correlations between variables and their impact on water quality and fish performance. In biofloc, a moderate positive correlation was found between dissolved oxygen, pH and temperature, highlighting the importance of maintaining optimal oxygen levels. In raceways, a strong positive correlation was found between dissolved oxygen and pH, underlining the influence of pH on oxygen availability. No significant differences were found in feeding rates, feed conversion, mortality, and survival between the systems, indicating their equal productive efficiency and mortality control. These findings support that both biofloc and raceways are viable options for tilapia culture, with comparable results in water quality, fish performance and economic efficiency. This study can guide aquaculture producers in choosing the most appropriate culture system according to their specific needs and conditions.
subject: Paper
  topic: section
subject: Aquaculture
  topic: keywords
subject: Tilapia
  topic: keywords
subject: Biology
  topic: subjects
subject: Biology
  topic: disciplines
creator: Ingris Yohana Hernandez-Martinez
creator: Margarita Del Rosario Salazar Sánchez
creator: Luis Francisco Pereira Flores
rights: Copyright (c) 2025 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-02-23
publication date: 2025-02-23
starting page: 1
ending page: 8
doi: 10.24054/bistua.v23i1.2936

Nucleation and growth history of garnet in metamorphic rocks: 2D and 3D petrological insights
type: item
description: This study investigates garnet nucleation and growth in metamorphic rocks through integrated controlled serial sectioning, high-resolution backscattered electron (BSE) imaging, and three-dimensional reconstruction. Implementation of a systematic material removal protocol significantly enhanced surface reproducibility and analytical consistency relative to conventional manual preparation methods. A dataset of 2,100 BSE images enabled the generation of high-resolution mosaics via automated image stitching. Digital processing and algorithmic segmentation allowed quantitative characterization of particle size distributions (PSD) across 50 consecutive layers. The resulting Gaussian PSD indicates spatial and temporal variability in nucleation rates and growth regimes, providing kinetic constraints on crystallization processes within the Arquía Complex. The integration of advanced imaging and computational modeling establishes a quantitative petro-textural framework for 2D and 3D analysis of metamorphic rocks, enabling rigorous assessment of grain size, morphology, orientation proxies, and spatial distribution of mineral phases, pores, and fractures. These parameters are critical for interpreting metamorphic reactions and reconstructing tectonometamorphic evolution. Our findings provide new quantitative constraints on garnet crystallization mechanisms and their role in regional metamorphic development.
subject: Paper
  topic: section
subject: crystal size distribution
  topic: keywords
subject: Arquía Complex
  topic: keywords
subject: granate
  topic: keywords
subject: NA
  topic: subjects
subject: Geología
  topic: disciplines
creator: Leydy Mariana Hernández-Marín
creator: Carlos Alberto Chacón-Ávila
creator: Carlos Alberto Ríos-Reyes
creator: Oscar Mauricio Castellanos-Alarcón
rights: Copyright (c) 2026 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2026-02-14
publication date: 2026-02-14
starting page: 1
ending page: 15
doi: 10.24054/bistua.v23i2.3672

In vitro antagonistic activity of native Trichoderma strains against Botrytis sp
type: item
description: Botrytis cinerea is a plant pathogen that affects a wide range of plants and is responsible for severe economic losses in more than 200 crops worldwide. Although the use of fungicides is the most common strategy for its control, the genetic plasticity of this fungus allows it to develop resistance. Consequently, biological control has gained ground as an alternative or complementary approach to fungicides. In this respect, the genus Trichoderma is the most extensively studied group with the greatest potential for biological control of B. cinerea. Therefore, the search and study of native Trichoderma strains with biocontrol potential is a line of interest for the local and regional agricultural sector. This study reports the in vitro investigation of the biocontrol capacity of a commercial product, in comparison with the antagonistic power of two native strains isolated from soils in the agricultural areas of the municipalities of Pamplona (TN01) and Bucarasica (TN02), in Norte de Santander. Morphological characterisation determined that both strains are taxonomically located in the Viride clade of the genus Trichoderma. The growth rate and the percentage of radial growth inhibition (PICR) of the antagonists were determined using the dual culture technique. The results indicated that TN01 was the strain with the highest potential to be used as a biological controller of Botrytis spp. This strain showed the highest apical growth rate and achieved a PICR of 80% at the end of the experiment, exceeding that achieved by the commercial reference product. Conversely, strain TN02 exhibited a diminished antagonistic capacity, with a PICR of 55% after a 12-day period. This observation suggests the potential for the autochthonous strain TN01 to be evaluated under cultivation conditions.
subject: Paper
  topic: section
subject: Biological control; phytopathogen; agrochemicals, grey mould.
  topic: keywords
subject: NA
  topic: subjects
subject: Microbiology
  topic: disciplines
creator: Cristian Schmelink Ramos Monterrosa
creator: María Cristina Rozo Flórez
creator: Ramón Ovidio García-Rico
creator: Angela Maritza Cajiao Pedraza
creator: Gladys Montañez Aceved
rights: Copyright (c) 2025 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-05-23
publication date: 2025-05-23
starting page: 1
ending page: 8
doi: 10.24054/bistua.v23i1.3660

Antibacterial activity of a pigment produced by Serratia marcescens FCS2015 using peanut powder as a substrate and different glucose concentrations
type: item
description: The search for sustainable strategies to obtain pigments with potential uses in industry is increasingly important, especially those that, in addition to presenting a certain color, show antimicrobial and antioxidant activities, among others. Many of these compounds with characteristic colors are produced by microorganisms and their production has been explored in different fermentation systems. Prodigiosin, for example, a bacterial pigment for which antibacterial, antifungal, antiparasitic and even antiviral activity has been reported, is produced by species such as Serratia marcescens in submerged fermentations using various substrates such as casein, peptone, glycerol, and starch. However, some sugars such as glucose when present in culture media can inhibit its synthesis. The objective of this study was to evaluate the production of prodigiosin in culture media supplemented with different concentrations of peanut powder, a substrate rich in lipids and proteins, in addition to determining how the concentration of glucose in these media affects the production of the pigment. The results revealed that the higher the concentration of peanut powder in the culture media, the greater the production of prodigiosin. Similarly, a decrease in pigment production was found as the glucose concentration in the media increased. The antimicrobial activity of the extracts obtained from the cultures in media with low glucose concentration was confirmed by inhibition of the growth of Staphylococcus aureus ATCC 29213 and Escherichia coli ATCC 700891. This work once again confirms the biological potential of the prodigiosin obtained from S. marcescens and it is proposed to carry out toxicity studies for this pigment in addition to new tests of antimicrobial activity using other organisms of clinical and biotechnological interest as controls.
subject: Paper
  topic: section
subject: antibacterial
  topic: keywords
subject: fermentations
  topic: keywords
subject: prodigiosin
  topic: keywords
subject: Microbiology
  topic: subjects
subject: Microbiology
  topic: disciplines
creator: Daniel Andrés López Restrepo
creator: Julián Esteban Pineda Montoya
creator: Victor Manuel Osorio-Echeverri
rights: Copyright (c) 2026 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2026-01-28
publication date: 2026-01-28
starting page: 1
ending page: 7
doi: 10.24054/bistua.v23i2.3633

Evaluation of the rate of utilization of organic substrates by microorganisms in fixed and suspended biomass in reactors that treat leachate from landfills
type: item
description: This study evaluates the effectiveness of DI-FAFS (two-stage) and TRI-FAFS (three-stage) systems for treating landfill leachate (LFL), comparing them with reactors such as rotating biological contactor (RBC), trickling filter (TF), and UASB. The results showed that TRI-FAFS achieved the highest COD removal efficiency (85%-95%), followed by DI-FAFS (70%-85%), due to its staged configuration, which enhances the degradation of recalcitrant compounds and reduces metabolic inhibition. COD loads ranged from 12–25 g/m²-day (RBC) to 18.65 kg/m³-day (UASB), under controlled pH (8–9) and temperature (18–34 °C) conditions.
subject: Paper
  topic: section
subject: Leachates
  topic: keywords
subject: Anaerobic reactors
  topic: keywords
subject: Microorganisms
  topic: keywords
subject: Degradation of organic matter
  topic: keywords
subject: Methane production
  topic: keywords
subject: NA
  topic: subjects
subject: applied basic sciences
  topic: disciplines
creator: Julio Isaac Maldonado Maldonado
creator: Jorge Luis Ortiz Carrillo
rights: Copyright (c) 2025 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-05-23
publication date: 2025-05-23
starting page: 1
ending page: 6
doi: 10.24054/bistua.v23i1.3588

Molecular compatibility analysis between proteins and their inhibitors: a case study in the formulation of the monoclonal antibody 4trp
type: item
description: The incorporation of protease inhibitors (saquinavir, ritonavir, indinavir, nelfinavir, amprenavir, and lopinavir) into antiretroviral therapy has significantly reduced the morbidity and mortality associated with AIDS. These non-peptidic compounds potently and selectively inhibit HIV-1 protease. Therefore, an affinity study was conducted between the protease enzyme and each of its inhibitors by their binding energy using molecular docking to determine which inhibitor exhibits the highest binding affinity. Additionally, hydrogen bond interactions between the receptor and each ligand were analyzed to evaluate their correlation. From another perspective, this study examines the synthesis of the monoclonal antibody 4BINDING AFFINITY (IgG2a, derived from a murine IgG3 subclass antibody. Several mutations were introduced into the protein structure, replacing residues identified as high-risk for deamidation reactions. The analysis aimed to compare structural modifications to identify those that minimize aggregation risk. A quality assessment of the mutated product was conducted, supporting the stability improvements observed.
subject: Paper
  topic: section
subject: Potential energy, chemical instability, physical instability, mutation, isoelectric potential
  topic: keywords
subject: Farmaceutica
  topic: subjects
subject: diseño de protuctos
  topic: subjects
subject: simulación
  topic: subjects
subject: Interacción de proteínas
  topic: subjects
subject: Química aplicada
  topic: disciplines
creator: Yina Paola Ortega Santiago
creator: Neleysis Bolaños
creator: José Miguel Pinto Gomez
rights: Copyright (c) 2025 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-05-14
publication date: 2025-05-14
starting page: 1
ending page: 9
doi: 10.24054/bistua.v23i1.3563

Integration of multiscale porosities and permeabilities in Paleogene reservoir rocks of the Middle Magdalena Valley Basin, Colombia
type: item
description: This study presents a descriptive mineralogical and textural analysis of sedimentary rocks located at the top of Paleogene formations in the Middle Magdalena Valley Basin, specifically within the La Paz, Esmeralda, Colorado, and Mugrosa formations. These units exhibit clearly distinguishable sedimentary structures, depositional environments, and mineral compositions. Advanced techniques such as X-ray computed tomography (CT), petrography, X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to thoroughly characterize the sedimentological, mineralogical, and porosity properties of the samples. X-ray CT enabled the identification of sedimentary and biogenic structures, as well as syn-sedimentary deformations, and provided density and effective atomic number values that are useful for facies differentiation. Petrographic analysis revealed sandstones with variable grain sizes, typical of fluvial environments, showing significant variations in grain size, a wide range of cementing materials, and well-developed secondary porosity that enhances reservoir permeability. XRD identified quartz, feldspars, and clay minerals as the main components, while SEM highlighted the distribution of clay minerals within the pores. The observed lithologies include polymictic conglomerates, shales, sandy shales, sublithic sandstones, and lithic sandstones, associated with fluvial channels, floodplains, and meandering river systems. Computed tomography is consolidated as a key non-destructive tool in sedimentological interpretation, offering high-resolution imaging and valuable data on density, mineralogy, lithology, porosity, and facies. This multidisciplinary approach provides essential information for reservoir characterization, the reconstruction of depositional environments, and the understanding of geological history, contributing to the advancement of geological research and resource exploration in the Middle Magdalena Valley Basin.
subject: Paper
  topic: section
subject: clay minerals
  topic: keywords
subject: petrophysical properties
  topic: keywords
subject: reservoirs
  topic: keywords
subject: sedimentary sequences
  topic: keywords
subject: Colombia
  topic: keywords
subject: Spanish
  topic: subjects
subject: Petrology
  topic: disciplines
subject: Mineralogy
  topic: disciplines
subject: Sedimentaology
  topic: disciplines
creator: Ricardo Amorocho
creator: Carlos Villarreal
creator: Jorge Meza
creator: Carlos Rios
rights: Copyright (c) 2025 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-06-06
publication date: 2025-06-06
starting page: 1
ending page: 20
doi: 10.24054/bistua.v23i1.3497

Efficiency and Spatial homogeneity of the SERS signal in plasmonic antennas: A study at the nano and micro scales
type: item
description: This study evaluates the efficiency and spatial homogeneity of the SERS signal in various gold optical antenna morphologies using 4-MBA as a probe molecule. The results demonstrate that AuFON antennas exhibit significantly higher SERS intensity compared to rough surfaces, spherical cavities, and the commercial Klarite system. Additionally, both AuFON and Klarite show improved signal homogeneity. These findings highlight the critical role of ordered nanostructure morphology in enhancing SERS signal amplification and uniformity, positioning AuFON as a promising platform for advanced ultrasensitive molecular detection applications.
subject: Paper
  topic: section
subject: Optical antennas
  topic: keywords
subject: Raman spectroscopy
  topic: keywords
subject: plasmonics
  topic: keywords
subject: SERS
  topic: subjects
subject: Plasmonics
  topic: subjects
subject: Optics
  topic: disciplines
subject: plasmonics
  topic: disciplines
creator: Luis Alfonso Guerra Hernández
creator: Oslen Dilayder Jaimes Suarez
creator: Jorge-Enrique Rueda-Parada
rights: Copyright (c) 2024 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2024-12-29
publication date: 2024-12-29
starting page: 1
ending page: 12
doi: 10.24054/bistua.v22i2.3338

Epidemiological Characteristics of Polycystic Ovary Syndrome in a Population Attended at a University Hospital in Colombia
type: item
description: The aim of this research is to determine the epidemiological profile of patients with polycystic ovary syndrome who are treated at the Erasmo Meoz University Hospital in the municipality of Cúcuta, Colombia, between 2018 and 2022. To achieve this objective, a cross-sectional, descriptive, and observational epidemiological study was conducted, seeking to determine the epidemiological profile of patients with polycystic ovary syndrome treated at this hospital, as well as the most frequent comorbidities and complications present in this patient population. The analysis of the results shows that the most affected age group is women between 20 and 24 years old (30.2%), and the most common comorbidity is obesity (20.8%). Among the patients treated, 67% were Colombian and 33% Venezuelan, who most frequently consulted for pelvic pain, and the majority were treated with combined oral contraceptives.
subject: Paper
  topic: section
subject: Polycystic Ovary Syndrome; Prevalance; Comorbidity; Hospitals, University
  topic: keywords
creator: Ivan Dario Higuita Anaya
creator: Yurany Yeraldine Dia Lagos
creator: Daniela Fernanda Villacorte
creator: David Calvache Mena
creator: Omar Geovanny Perez Ortiz
creator: Alvaro Uribe Gil
rights: Copyright (c) 2026 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2026-01-28
publication date: 2026-01-28
starting page: 1
ending page: 7
doi: 10.24054/bistua.v23i2.3305

Bat Guano Carollia perspicillata is a source of Nitrogen Cycle Bacteria and its use as fertilizer
type: item
description: Bat guano is considered a source of nutrients and bacteria that can act as a potential biofertilizer, associating vigorous growth of plants around where these mammals live, which today would be an environmentally friendly alternative, by reducing contamination by agrochemicals, the increase in production costs and meeting the demand for food acquisition. In Colombia, studies of bacteria that interact in bat guano, their potential as biofertilizers, the fixation of macro and micronutrients that interact in the endosphere and rhizosphere in symbiosis with plants are limited. The main objective of this research is to carry out a chemical and bacterial analysis of the nitrogen cycle of the Bat Guano Carollia perspicillata, analyzing its effectiveness with Phaseolus vulgaris (bean) cultures. The study place was La Palma-Cundinamarca, study population (Carollia perspicillata bat), a simple random sampling of the Guano was carried out in the rainy season and dry season and then an isolation of bacteria from the Nitrogen cycle was carried out in selective culture media. (MCN) and a chemical analysis of Nitrogen, Phosphorus and Potassium (NPK), identifying the bacteria Nitrobacter sp, Azotobacter sp and Nitrosomonas sp in the rainy season and Nitrosococcus sp in the dry season. Small-scale bioassays were carried out to analyze the biofertilizer potential of Guano with Phaseolus vulgaris (bean) crops, observing plant growth for a month, taking data every 7 days. The growth of Phaseolus vulgaris (bean) with the application of Guano showed double growth. Guano from Carollia perspicillata could be a good comprehensive fertilizer since it contains bacteria related to the Nitrogen Cycle and a high NPK.
subject: Paper
  topic: section
subject: Chemical analysis
  topic: keywords
subject: Actinobacteria
  topic: keywords
subject: Bacteria
  topic: keywords
subject: biofertilizers
  topic: keywords
subject: bioassay
  topic: keywords
subject: NPK
  topic: keywords
subject: Phaseolus vulgaris
  topic: keywords
subject: Phyllostomidae
  topic: keywords
subject: microbiologia
  topic: subjects
subject: Microbiología
  topic: disciplines
creator: Danna Marcela Piraquive Bermudez
creator: Hugo Mauricio Jimenez Melo
rights: Copyright (c) 2024 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2025-08-21
publication date: 2025-08-21
starting page: 1
ending page: 11
doi: 10.24054/bistua.v22i2.3045

Real-Time Recording and Reconstruction of Holograms Integrating Optical and Digital Technology
type: item
description: The implementation of a Mach-Zehnder interferometer for hologram recording and a coupled 2F optical processor for reconstruction is presented, allowing both processes to be carried out in real-time. Using a hybrid optical-digital system, the experimental setup employs a CMOS2500 camera and an LCR2500 modulator to achieve high-resolution recording and dynamic reconstruction of holographic images. The experimental results demonstrate the system's capability for real-time holography. Fourier hologram results are presented.
subject: Paper
  topic: section
subject: Holography
  topic: keywords
subject: Interference
  topic: keywords
subject: Diffraction
  topic: keywords
subject: Fourier
  topic: keywords
subject: Research Outcome
  topic: subjects
subject: Optics
  topic: disciplines
creator: Mileydi Cruz Mendoza
creator: Jorge Enrique Rueda Parada
rights: Copyright (c) 2024 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2024-07-12
publication date: 2024-07-12
starting page: 1
ending page: 10
doi: 10.24054/bistua.v22i1.3005

Microbiological profile of paddy and commercial rice (Oryza sativa L) in the department of Norte de Santander, Colombia.
type: item
description: Rice (Oryza sativa L.) is a globally important food, and in Colombia, it ranks as the third-largest crop, covering 25,000 hectares and yielding over 180,000 tons annually. This study assessed the microbiological profile of rice cultivated and marketed in the Norte de Santander department, analyzing 55 samples from the main production areas (Cúcuta, El Zulia, Tibú, and Puerto Santander). Total coliforms, Escherichia coli, mesophilic aerobes, molds, and yeasts were quantified. In paddy rice, high levels of total coliforms (5.37 log CFU/g) and E. coli (3.23 log CFU/g) were found, while in commercial rice, these values met the established standards. Counts of mesophilic aerobes and molds and yeasts were elevated in both paddy and commercial rice. These findings suggest deficiencies in irrigation water management and grain storage, posing a public health risk due to the potential production of mycotoxins. Therefore, effective strategies are needed to control microorganisms and ensure rice safety throughout the food supply chain.
subject: Paper
  topic: section
subject: Microbiological analysis
  topic: keywords
subject: rice
  topic: keywords
subject: microbial contamination
  topic: keywords
subject: food safety
  topic: keywords
subject: alimentos
  topic: subjects
subject: ambiental
  topic: subjects
subject: microbiologia
  topic: subjects
subject: alimentos
  topic: disciplines
creator: Jorge Luis Ortiz Carrillo
creator: Liliana Rojas Contreras
creator: Ramón Ovidio García Rico
rights: Copyright (c) 2024 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2024-10-21
publication date: 2024-10-21
starting page: 1
ending page: 6
doi: 10.24054/bistua.v22i2.2985

Approximation and Simulation of Signal Belonging to the Generalized Weighted Lipschitz Class by ...
type: item
description: In this study, the well-known Fourier Conjugate series, which is traditionally summable through various individual methods, demonstrates enhanced convergence speed and improved signal approximation when subjected to a product transform. This work aims to establish a novel theorem for approximating signals within a specific function class, utilizing product summability of conjugate Fourier series. Additionally, a range of illustrative examples is provided to validate the proposed summability method and highlight their convergence behavior. The findings are further supported through simulations conducted using MATLAB programming.
subject: Paper
  topic: section
subject: Generalized weighted Lipschitz class
  topic: keywords
subject: Conjugate Fourier series
  topic: keywords
subject: Holder inequality
  topic: keywords
subject: Mathematical analysis
  topic: subjects
subject: Mathematics
  topic: disciplines
creator: Smita Sonker
creator: Paramjeet Sangwan
creator: Bidu Bhusan Jena
creator: Susanta Kumar Paikray
rights: Copyright (c) 2024 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2024-11-03
publication date: 2024-11-03
starting page: 1
ending page: 8
doi: 10.24054/bistua.v22i2.2842

Epidemiological profile of patients with malaria admitted to the Erasmo Meoz University Hospital in the municipality of Cúcuta, during the period 2014-2021
type: item
description: The objective of this research is to describe the epidemiological profile of patients with malaria who enter the ESE HUEM of the Municipality of San José de Cúcuta, during the period 2014-2021. A cross-sectional observational epidemiological study is developed, which seeks to determine the prevalence of patients with malaria admitted to this hospital during the study period; Variables associated with sex, age, clinical manifestations, type of parasite, etc. are taken into account. The analysis of the results allows us to determine that the highest percentage of patients treated are of Colombian nationality (67.74%), although there is a high presence of Venezuelan patients (32.26%). Fever is presented as the clinical manifestation with the highest diagnosis in patients admitted to the hospital for this pathology (91.36%). The Plasmoidum vivax species is recorded as the parasite with the greatest presence. The male sex has a higher prevalence of hospitalization. When analyzing the age range with the highest risk of malaria infection, patients between 15 and 59 years old are recorded as the population that is hospitalized most frequently.
subject: Paper
  topic: section
subject: Malaria, Clinical Manifestations, Epidemiological Profile.
  topic: keywords
subject: enfermedades Infecciosas de alto impacto en Colombia
  topic: subjects
subject: ciencias de la salud
  topic: disciplines
creator: Omar Geovanny Perez Ortiz
creator: Juan Sebastián Pérez Llaín
rights: Copyright (c) 2024 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2024-10-29
publication date: 2024-10-29
starting page: 1
ending page: 7
doi: 10.24054/bistua.v22i2.2973

Bessel polynomials by context-free grammars
type: item
description: The Bessel polynomials are an orthogonal family of polynomials yn(x) introduced as solutions of the second-order differential equation x2y''+2(x+1)y'=n(n+1)y, they satisfy the recurrence relation yn(x)=(2n-1)xyn-1(x)+yn-2(x), where y1(x)=x+1 y y0(x)=1. In terms of derivatives, Bessel polynomials can be described by the recurrence yn(x)=(nx+1)yn-1(x) + x2y'n-1(x). In this paper, we study the connection between Bessel polynomials and context-free grammars through the formal derivative operator, and we prove some identities of this family of polynomials.
subject: Paper
  topic: section
subject: Bessel polynomials
  topic: keywords
subject: formal derivative operator
  topic: keywords
subject: context-free grammars
  topic: keywords
subject: mathematics
  topic: subjects
subject: Theory of computation
  topic: disciplines
creator: Juan Triana
rights: Copyright (c) 2024 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2024-10-24
publication date: 2024-10-24
starting page: 1
ending page: 5
doi: 10.24054/bistua.v22i2.2932

Microplastics in continental water sources: impact and mitigation strategies from the perspective of agroindustrial engineering
type: item
description: Microplastic research is essential because of their global impact on aquatic ecosystems and human health. Despite the recognition of the problem, there remains a gap in the understanding and mitigation of these pollutants in inland water bodies. This study aims to analyse the state of knowledge on the presence, impact, and mitigation strategies of microplastics from an agro-industrial engineering perspective. A systematic qualitative methodology was employed to review the scientific literature, using specific inclusion criteria in various bibliographic databases, focusing on the search equation microplastic AND freshwater. The results reveal that microplastic pollution is a complex and multifaceted problem, with diverse emission sources affecting aquatic and terrestrial ecosystems. Industrial, agricultural, tourism and domestic activities all contribute to the release of microplastics into the environment. Understanding these sources is essential to develop effective mitigation and removal strategies, such as reducing their generation, recycling existing ones and immobilization to prevent their dispersal. The adoption of sustainable agricultural practices and efficient wastewater treatment systems is crucial in this process. The evaluation of these strategies through mathematical modelling considering the amount and type of microplastics generated, as well as their environmental impact. Successful implementation requires collaboration with farmers and ranchers to promote more sustainable practices. Although examples of implementation are presented, it is important to recognize the limitations and to further research together with relevant stakeholders to find more effective and sustainable solutions.
subject: Paper
  topic: section
subject: Microplastic
  topic: keywords
subject: Agro-industry
  topic: keywords
subject: Impact
  topic: keywords
subject: Mitigation
  topic: keywords
subject: Resultado de proyecto de investigación
  topic: subjects
subject: Agroindustrial
  topic: disciplines
creator: Ana Isabel Gamarra- Jiménez
creator: Margarita del Rosario Salazar- Sánchez
rights: Copyright (c) 2024 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2024-06-21
publication date: 2024-06-21
starting page: 1
ending page: 10
doi: 10.24054/bistua.v22i1.2901

Power Aggregation Operators in MADM Problems Under Pythagorean Neutrosophic Numbers Based on Hamacher t-norm and t-conorm Operations
type: item
description: The notion of Pythagorean neutrosophic sets (PNSs) and their associated Pythagorean neutrosophic numbers (PNNs) is useful for exploring imprecise knowledge under restricted conditions. PNSs address deficiencies in existing theories and are easily applicable to various uncertain problems. On the other hand, Hamacher operators are effective tools for multi-attribute decision-making (MADM). This paper combines PNSs with Hamacher t-norm and t-conorm operators to develop novel aggregation operators based on PNNs, offering a powerful approach to model uncertainty in MADM problems. The proposed aggregation operators include the Pythagorean neutrosophic Hamacher power arithmetic (PNHPA) operator, the power geometric (PNHPG) operator, the power ordered weighted average (PNHPOWA) operator, and the power ordered weighted geometric (PNHPOWG) operator. Key properties of these operators are analyzed to ensure their applicability in MADM. Using these operators, the paper introduces a practical approach to solving multi-attribute decision-making problems under uncertainty represented by PNNs. A numerical example is provided to verify the proposed approach and conduct a comparative analysis to demonstrate its effectiveness against other methods. This study contributes to decision-making by providing innovative tools based on PNNs and Hamacher operators, expanding the ability to model uncertainty and tackle complex problems in multi-attribute contexts.
subject: Paper
  topic: section
subject: Hamacher operators; Pythagorean neutrosophic numbers; Pythagorean neutrosophic Hamacher aggregate operators; MADM
  topic: keywords
subject: mathematics
  topic: subjects
subject: Mathematics
  topic: disciplines
creator: Carlos Granados
creator: Somen Debnath
rights: Copyright (c) 2024 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2024-12-06
publication date: 2024-12-06
starting page: 1
ending page: 11
doi: 10.24054/bistua.v22i2.2826

Evaluation of the Efficacy of a Micropropagation Protocol in Two Potato Varieties: Solanum tuberosum (Perla Negra) y Solanum phureja (Criolla Colombia)
type: item
description: The quality of potato seeds is essential to ensure sustainable and profitable production in the Norte de Santander department. It is worth noting that the vegetative reproduction of potatoes exposes them to various seed-transmitted diseases, gradually affecting their quality. This study focused on the Norte de Santander region in Colombia, where the adoption of micropropagation is presented as an effective alternative for pre-basic potato seed production. The research aimed to confirm a micropropagation protocol proposed by Vollmer et al. (2020), applying it to two specific potato varieties: Papa Perla Negra and Papa Criolla Colombia. The validation took place in the in vitro plant tissue culture laboratory at the University of Pamplona. Statistically, no significant differences were found between the varieties in the evaluated variables, thus supporting the validity of the protocol. In conclusion, micropropagation proves to be an effective alternative for pre-basic potato seed production in the region, providing an efficient and rapid method for generating homogeneous and high-quality mother plants.
subject: Paper
  topic: section
subject: plant propagation
  topic: keywords
subject: micropropagation and potato Colombia
  topic: keywords
subject: Vegetal biotechnology
  topic: subjects
subject: Biotecnologia Vegetal
  topic: disciplines
creator: Giovanni Cancino Escalante
creator: Cesar Villamizar Quiñones
creator: Susan Cancino
rights: Copyright (c) 2024 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2024-06-21
publication date: 2024-06-21
starting page: 1
ending page: 6
doi: 10.24054/bistua.v22i1.2710

Effect of Pinus patula (Pinaceae) plantations on soil and vegetation in the Rabanal moor, Samacá Boyacá
type: item
description: The Rabanal moor covers 4,172 hectares, of which 16% corresponds to the municipality of Samacá, it has two reservoirs, a dam for storage and regulation of water and pine plantations that generate the immobilization of nutrients, the reduction of the capacity to carry out recycling processes, and soil acidification. The objective of this study is to evaluate the effect of Pinus patula plantations on the soil and vegetation of the Rabanal páramo in the municipality of Samacá-Boyacá. Taking into account the vegetation of the moor and the plantation in terms of height, coverage, frequency and DBH of the species. In the paramo, 16 families, 35 genera and 42 species were recorded, in 501 individuals, the most abundant species were Espeletia boyacensis, Paepalanthus alpinus, Arcytophyllum nitidum and Puya nitida, versus the paramo planted with P. patula where 6 families were recorded, 6 genera and 6 species, with 80 individuals. Regarding the soil, the variables that presented significant differences were calcium, magnesium, magnesium saturation, Mg/K and K/Mg. In the case study, forest plantation has eliminated 88% of the native species of the moor and has decreased the coverage of the 5 species that still remain there. The variable soil properties, such as the type of elements and exchange, are very similar between the two sites, due to the availability of water and nutrients that P. patula has in the study area. This research serves as input to take technical and management measures applicable to the Colombian paramos.
subject: Paper
  topic: section
subject: Loss of diversity; páramo vegetation; soil changes; pine plantations in páramo.
  topic: keywords
subject: Restauración
  topic: subjects
subject: Ciencias básicas aplicada
  topic: disciplines
creator: Alejandra Cardenas Cardenas
creator: Francisco Cortés Pérez
rights: Copyright (c) 2024 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2024-06-27
publication date: 2024-06-27
starting page: 1
ending page: 6
doi: 10.24054/bistua.v22i1.2697

https://ojs.unipamplona.edu.co/bistua/article/view/2645
type: item
title: A case study of PT pseudosections constructed in the MnNCKFMASH (MnO-Na2O-CaO-K2O-FeO-MgO-Al2O3-SiO2-H2O) system for metapelitic rocks in the garnet zone of the Silgará Formation, southwestern Santander Massif (Colombia)
description: PT pseudosections constructed in the MnNCKFMASH (MnO-Na2O-CaO-K2O-FeO-MgO-Al2O3-SiO2-H2O) system based on bulk-rock chemistry and mineral chemistry data of metapelitic rocks in the garnet zone of the Silgará Formation, southwestern Santander Massif (Colombia) were evaluated based on the application of computer programs such as THERIAK/DOMINO, GTB and GIBBS. They can be used to estimate peak metamorphic PT conditions and constrain parts of metamorphic PT paths. The previously published PT conditions (495-518 oC and 4.4-5.5 kbar garnet zone) are confirmed by the resultant pseudosections in in the MnNCKFMASH system with garnet + potassium feldspar + biotite + muscovite + quartz as the stable mineral assemblage. Several mineral reactions, such as chlorite after biotite and garnet, sericite after plagioclase, chlorite+sericite after staurolite, reveal a retrograde metamorphism, and the formation of these hydrous phases probably took place during decompression at lower PT conditions in the presence of high amounts of H2O.
subject: Paper
  topic: section
subject: Garnet zone; Silgará Formation; southwestern Santander Massif; PT pseudosections; Thermobarometry
  topic: keywords
subject: We have no additional information on our submission.
  topic: subjects
subject: We have no additional information on our submission.
  topic: disciplines
creator: Paula Giovanna Delgado
creator: Ana Milena Suárez
creator: Carlos Alberto Ríos
creator: Julián Andrés López
creator: Oscar Mauricio Castellanos
rights: Copyright (c) 2024 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2024-09-13
publication date: 2024-09-13
starting page: 1
ending page: 15
doi: 10.24054/bistua.v22i2.2645

Introduction to actinic damage and actinomycetes as a promising source for eco-friendly photoprotective compounds
type: item
description: The use of sunscreens is a fundamental strategy of an effective photoprotection scheme. Currently, several ultraviolet (UV) filters have been questioned for their side effects, mainly those that harm the environment. Therefore, there is a demand to find compounds with photoprotective properties. In this regard, natural products have traditionally been a promising source of compounds with diverse biological activities, including those related to photoprotection. Recently, natural microbial products have shown very promising opportunities supported by biotechnological advances, including those possibilities opened up by computer-aided tools. Under this scenario, several studies have recognized the great potential of the phylum Actinomycetota as a source of compounds with photoprotective properties. This review examines how solar radiation induces skin photodamage, explores existing photoprotection strategies, and highlights the immense potential that lies in the specialized metabolism of actinomycetes. These microorganisms offer a rich and untapped vein for the development of innovative products that could transform the sun protection industry.
subject: Paper
  topic: section
subject: Photodamage
  topic: keywords
subject: Sunscreen
  topic: keywords
subject: Natural Products
  topic: keywords
subject: Actinomycetota
  topic: keywords
subject: Actinobacteria
  topic: keywords
subject: Biology
  topic: subjects
subject: Basic applied sciences
  topic: disciplines
subject: Bioprospecting
  topic: disciplines
creator: Jeysson Sánchez-Suárez
creator: Luis Díaz
creator: Luisa Villamil
creator: Ericsson Coy-Barrera
rights: Copyright (c) 2024 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2024-06-21
publication date: 2024-06-21
starting page: 1
ending page: 10
doi: 10.24054/bistua.v22i1.2584

Association between virtual training during COVID-19 confinement and symptoms of depression, anxiety and stress in medical students in clinical practices post pandemic 2023
type: item
description: COVID-19 caused preventive isolation, prohibition of group meetings, in-person classes, and suspended clinical practices. The students continued their studies with virtual methodology, from March 2020 to December 2021, returning to academic presence in 2022-1. Objective: to analyze the association between the virtual training received during confinement due to COVID-19 (2020-2021) and symptoms of depression, anxiety and stress in medical students from the University of Pamplona who carry out clinical practices in post-pandemic 2023. Method: observational study cross-sectional analytical study, carried out on 205 students, using the DASS-21 scale and a self-administered questionnaire of academic, sociodemographic and free-time, leisure and religious variables. Results: symptoms of depression (57.6%), anxiety (57.6%) and stress (55.1%) were found in the students; The symptomatology values found are higher than the national average and other similar investigations. The risk of depression varies with the age of the students (p < 0.029), being higher in students at an early age. The difficulty in applying the knowledge acquired during virtual training in practices was the main finding, with the probability of suffering from depression being 4, 6 and 7 times higher in students who considered the application of knowledge regular, difficult and very difficult. acquired virtually in practices. Conclusions: there was a statistically significant relationship with the difficulty in applying the knowledge acquired virtually in clinical practices, where the greater the difficulty, the greater the degree of depression and stress. Sleep quality is a protective factor as is family functionality.
subject: Paper
  topic: section
subject: Depression
  topic: keywords
subject: Anxiety
  topic: keywords
subject: stress
  topic: keywords
subject: pandemic
  topic: keywords
subject: COVID19
  topic: keywords
subject: COVI19
  topic: subjects
subject: Medicine
  topic: disciplines
creator: Maritza Lizbeth Maldonado Llizcano
creator: Jorge Ivan Castaño Gutiérrez
creator: Sherlyn Willougby Diaz
rights: Copyright (c) 2023 © Autores; Licencia Universidad de Pamplona https://creativecommons.org/licenses/by-nc-nd/4.0
date: 2023-12-12
publication date: 2023-12-12
starting page: 34
ending page: 42
doi: 10.24054/bistua.v21i2.2589