Repositorio Institucional Universidad EAFIT ::Examinando por Materia "Morphology"

Examinando por Materia "Morphology"

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Caracterización morfológica del depósito vetiforme epitermal en el NE del Batolito Antioqueño – Mina Los Balsos, Yolombó – Antioquia
(Universidad EAFIT, 2023) Cataño Soto, Cristian Camilo; Marín Cerón, María Isabel; Marín Cerón, María Isabel; Mina Los Balsos SAS
It is important to understand the morphology of a vein-type mineralization when seeking to estimate resources, as this knowledge supports subsequent decision-making in exploration and extraction processes, especially when structural factors play a significant role in mineral accumulation. In order to provide a tool that optimizes the exploration processes of the Los Balsos Mine project, a morphological model is being developed for the majority of structures intercepted by its tunneling, which serves as a basis for understanding the spatial behavior of veins, their hierarchization, spatial interaction, and their relationship with regional events. This information can be complemented with petrographic data in future projects. The study area is located in the northeastern part of the Antioquian batholith, in the youngest region of the body, where quartz vein deposits accompanied by sulfides are present and displaced by the interference zone of the Palestina Fault. These structures suffer from significant deficiencies in geometric and structural characterization, mainly due to the challenging accessibility of the area, which is mostly exploited by informal projects and lacks technical information in the public domain. That is why detailed mapping supported by samples and structural data was carried out, digitized into maps (1:500 and 1:50) that serve as the basis for prospective models. These models propose future exploration targets, which in turn facilitate economically and scientifically significant decision-making.
Clasificación de las desembocaduras fluviales del Caribe colombiano usando el diagrama de Galloway cuantitativo
(Universidad EAFIT, 2023) Cuervo Cano, Angie Lisbet; Paniagua Arroyave, Juan Felipe
Diversidad de murciélagos (Mammalia, Chiroptera) en una localidad de las estribaciones de la Serranía del Baudó al norte del Pacífico colombiano : Bahía Solano
(Universidad EAFIT, 2022) Alzate Zapata, Oscar Santiago; Díaz Nieto, Juan Fernando; Urrego Cárdenas, Danny Zulay
Extracción de fibras de celulosa de las hojas de piña para su uso en la industria papelera
(Universidad EAFIT, 2022) Quintero Quintana, María Camila; Ardila Arias, Alba Nelly; Politécnico Colombiano Jaime Isaza Cadavid, Grupo Camer, Semiller de Investigación SIVARE.
The influence of electrospinning parameters and solvent selection on the morphology and diameter of polyimide nanofibers
(Elsevier Ltd, 2018-03-01) Lasprilla-Botero; J.; Álvarez-Láinez; M.; Lagaron; J.M.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Polyimide (PI) fibers display excellent thermal and mechanical performance; they have been recently investigated to fabricate hydrophobic membranes (mats) for high-performance applications. We studied the effect of electrospinning processing parameters and solvent selection on the morphology and the diameter of PI fibers. 11 different solvents and 22 solvent systems able to dissolve PI were located in a Teas graph with the aim of building the solubility-electrospinnability map for this material. PI solutions prepared with various solvents were electrospun at different electrospinning process parameters according to a 34–1 fractional factorial design of experiments. Polymer concentration and applied voltage were the most significant factors to create thin and uniform fibers. More homogeneous fibers and reproducible electrospinning process were obtained by using polymer concentrations above 15 wt%. However, all solutions showed different morphological evolution according to the solvents used. Based on the solubility–spinnability region settled for this PI, non-woven mats were obtained with rough surface fiber morphology and high water contact angle, suitable for applications such as hydrophobic membranes for oil-water separation. © 2017 Elsevier Ltd
Morphodynamics of a high discharge tropical delta, San Juan River, Pacific coast of Colombia
(ELSEVIER SCIENCE BV, 2002-12-30) Restrepo, JD; Kjerfve, B; Correa, ID; Gonzalez, J; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
The San Juan River has one of the most extensive and best developed deltas on the Pacific coast of South America, measuring 800 km2. The river drainage basin measures 16465 km2 and is located in one of the areas with the highest precipitation in the western hemisphere. The annual rainfall varies from 7000 to 11 000 mm, and as a result the San Juan River has the highest water discharge (2550 m3 s-1), sediment load (16×106 t yr-1), and basin-wide sediment yield (1150 t km-2 yr-1) on the west coast of South America. The San Juan delta growth began approximately 5000 years BP. The structure of the delta is determined by the interactions between fluvial deposition and the effect of 1.7-m significant swells, mostly from the SW, and strong tidal currents. Analysis of delta progradation indicates that during 1848-1992 the morphology of the delta was characterized by beach ridge accretion, spit growth, narrowing of inlets, and a general advance of the delta shoreline. During the past decade processes such as rapid erosion of the delta shore, narrowing of barrier islands, and breaching of a new inlet, are the result of a long-term relative sea-level rise of 2.6 mm yr-1 due to tectonically induced subsidence coupled with a eustatic rise of sea-level. The delta also experiences strong oceanographic manifestations associated with the El Niño-La Niña cycle, causing regional sea-level elevation of 20-30 cm during El Niño years. Recent coastal subsidence in the delta is evidenced by (1) increased occurrence of non-storm washover events; (2) increased erosion of barrier islands with average loss of 11 m yr-1 during 1993-1997; and (3) a relative sea-level rise of 3.4 mm yr-1 during 1991-1999. The morphology and recent evolution of the San Juan delta are unique when compared to other deltas of South America because of the singular combination of extreme climatic, geologic, and oceanographic conditions under which the delta has formed and the absence of human-induced impact in the drainage basin. © 2002 Elsevier Science B.V. All rights reserved.
Morphological and mechanical characteristics of rigid polyurethane foams
(2009-01-01) Restrepo-Zapata, N.C.; Ossa H., E.A.; Mejia, F.C.; Restrepo-Zapata, N.C.; Ossa H., E.A.; Mejia, F.C.; Universidad EAFIT. Departamento de Ingeniería de Producción; Materiales de Ingeniería
Cellular materials are formed by solid cells in a gaseous core. They exhibit good strength to mass ratio and they are used as insulators and as a core in sandwich composite manufacture. This work describes an extensive study on the structure and physical-mechanical properties of rigid polyurethane (PU) foams. The effect of composition and processing conditions on the mechanical properties were studied. Morphology, specific strength and density were evaluated to determine the optimal levels of processing for a required application. Foam morphology was characterized using stereoscopy and optical microscopy. A basic mechanical property as compression strength was measured in the plateau zone.
Morphological, molecular and life cycle study of a new species of Oligogonotylus Watson, 1976 (Digenea: Cryptogonimidae) from Antioquia, Colombia.
(Universidad EAFIT, 2020) Vélez-Sampedro, Verónica; Lenis Vélez, Carolina
PTFE as a toughness modifier of high-performance PEI/PBT blends: Morphology control during melt processing
(John Wiley and Sons Ltd, 2021-02-01) Vásquez-Rendón M.; Álvarez-Láinez M.L.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
High-performance PEI/PBT blends are brittle because of phase distribution and blends densification. New morphologies developed by adding PTFE to PEI matrix during melt processing favor the toughness improvement of PEI/PBT blends. Ternary PEI/PBT/PTFE processability is not compromised by PTFE addition, and miscibility study by modulated differential scanning calorimetry and harmonic mean method shows that PTFE does not interfere with PEI and PBT interaction. Dual-phase and spore-like morphologies are formed for both PEI/PBT and PEI/PBT/PTFE blends, and they strongly influenced their mechanical performance. Although tensile strength of ternary blends does not decrease by PTFE addition, elongation at break deteriorates for blends with PEI concentrations <70 wt%. Nevertheless, blends with 80 wt% increase their ductility, and a synergic effect is observed in impact resistance results. PTFE acts as an impact modifier of PEI/PBT blends due to its distribution in the PEI matrix as debonded spheres and nanoparticles well-embedded in PEI matrix. © 2020 John Wiley & Sons Ltd
Relación entre el balance de flujos sedimentarios y la morfología actual del delta Sinú-Tinajones, Costa Caribe de Colombia
(Universidad EAFIT, 2021) Restrepo Muñoz, Juan Luis; Paniagua Arroyave, Juan Felipe
The role of volumetric power input in the growth, morphology, and production of a recombinant glycoprotein by Streptomyces lividans in shake flasks
(ELSEVIER SCIENCE BV, 2014-09-15) Marin-Palacio, Luz D.; Gamboa-Suasnavart, Ramses A.; Valdez-Cruz, Norma A.; Servin-Gonzalez, Luis; Soledad Cordova-Aguilar, Ma.; Soto, Enrique; Kloeckner, Wolf; Buechs, Jochen; Trujillo-Roldan, Mauricio A.; Universidad EAFIT. Departamento de Ciencias; Ciencias Biológicas y Bioprocesos (CIBIOP)
The impact of flask geometry on Streptomyces lividans growth and morphology, production and O-mannosylation of a recombinant O-glycoprotein (APA from Mycobacterium tuberculosis) was described and associated to the evolution of the volumetric power input (P/V) in three shake flask geometries. During the exponential growth, the highest P/V was found in baffled flasks (BF) with 0.51kW/m3, followed by coiled flasks (CF) with 0.44kW/m3 and normal Erlenmeyer flasks (NF) with 0.20kW/m3 (flasks volume of 250mL, filling with 50mL and agitated at 150rpm). During the stationary phase, P/V decreased 20% in BF and CF, but increased two times in NF, surely due to changes in mycelial morphology and its effects on rheology. Also, NF cultures were carried out at a filling volume and agitation of 15mL, 150rpm (15mL-NF), and 25mL, 168rpm (25mL-NF), in order to raise P/V closely to the values obtained in CF. However, different growth, morphology and recombinant protein productivity were obtained. These data indicate that P/V is not a definitive parameter that can determine bacteria growth and morphology, not even glycoprotein production. But it can be proposed that the oxygen transfer in the center of the pellets and hydromechanical stress might be the more relevant parameters than P/V. © 2014 Elsevier B.V.
Synthesis and characterization of Cu2+ substituted magnetite
(SPRINGER, 2011-11-01) Morales, A. L.; Velasquez, A. A.; Urquijo, J. P.; Baggio, E.; Universidad EAFIT. Departamento de Ciencias Básicas; Electromagnetismo Aplicado (Gema)
Samples of magnetite, both pure and doped with divalent copper, Fe3-xCuxO4, with x = 0, 0.05, 0.10 and 0.20 atm.%, were synthesized hydrothermally. The samples were characterized by Atomic Absorption Spectroscopy, Mössbauer Spectroscopy, X-ray diffraction, Scanning Electron Microscopy and SQUID magnetometry. The analyses made by the above techniques showed that as the Cu2+ concentration increases, a simultaneous reduction in the magnetic and structural parameters takes place, namely: magnetic hyperfine interactions at octahedral sites, particle size and lattice constant. Degradation in the particles morphology as well as a distribution of their size were also observed. Our study points two important effects of Cu2+ in magnetite, the first one is its incorporation within the structure, replacing Fe2+ ions and decreasing both the magnetic hyperfine interactions at octahedral sites and the bulk magnetization, the second one is the contraction of the crystalline lattice of magnetite, because incorporation of Cu2+ within the structure, generation of vacancies or both simultaneous effects. © 2011 Springer Science+Business Media B.V.
Tailoring the mechanical, thermal, and flammability properties of high-performance PEI/PBT blends exhibiting dual-phase continuity
(Elsevier Ltd, 2018-10-10) Vásquez-Rendón M.; Álvarez-Láinez M.L.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Binary PEI/PBT blends are prepared using a two-step melt processing method. Miscibility study by MDSC and DMA reveals partial miscibility, and new evidence on the morphological evolution of PEI/PBT blends is presented. Two groups of blends are recognized: PBT-rich blends and PEI-rich blends, as well as phase inversion at concentrations close to 50 wt% of PEI. Mechanical, thermal, and flame resistance performance is influenced by blends morphology, and an opportunity for tailoring blends properties is recognized. Tensile modulus shows synergic contribution for 50/50 and 80/20 blends and yield strength is strongly affected by interfacial adherence between constituents. In addition, elongation at break is compromised by PBT-rich blends morphology, and by PEI-rich blends densification. The 50/50 blend exhibits the best elongational at break result due to its co-continuous morphology. Thermal stability and flammability tests reveal that PEI improves the thermal resistance and charring of PBT, particularly for 50/50 blend. © 2018 Elsevier Ltd
The role of volumetric power input in the growth, morphology, and production of a recombinant glycoprotein by Streptomyces lividans in shake flasks
(ELSEVIER SCIENCE BV, 2014-09-15) Marin-Palacio, Luz D.; Gamboa-Suasnavart, Ramses A.; Valdez-Cruz, Norma A.; Servin-Gonzalez, Luis; Soledad Cordova-Aguilar, Ma.; Soto, Enrique; Kloeckner, Wolf; Buechs, Jochen; Trujillo-Roldan, Mauricio A.; Universidad EAFIT. Departamento de Ingeniería de Procesos; Procesos Ambientales (GIPAB)
The impact of flask geometry on Streptomyces lividans growth and morphology, production and O-mannosylation of a recombinant O-glycoprotein (APA from Mycobacterium tuberculosis) was described and associated to the evolution of the volumetric power input (P/V) in three shake flask geometries. During the exponential growth, the highest P/V was found in baffled flasks (BF) with 0.51kW/m3, followed by coiled flasks (CF) with 0.44kW/m3 and normal Erlenmeyer flasks (NF) with 0.20kW/m3 (flasks volume of 250mL, filling with 50mL and agitated at 150rpm). During the stationary phase, P/V decreased 20% in BF and CF, but increased two times in NF, surely due to changes in mycelial morphology and its effects on rheology. Also, NF cultures were carried out at a filling volume and agitation of 15mL, 150rpm (15mL-NF), and 25mL, 168rpm (25mL-NF), in order to raise P/V closely to the values obtained in CF. However, different growth, morphology and recombinant protein productivity were obtained. These data indicate that P/V is not a definitive parameter that can determine bacteria growth and morphology, not even glycoprotein production. But it can be proposed that the oxygen transfer in the center of the pellets and hydromechanical stress might be the more relevant parameters than P/V. © 2014 Elsevier B.V.
Volumetric power input as a reliable parameter for scale-up from shake flask to stirred-tank bioreactor: Production of a recombinant glycoprotein by Streptomyces lividans
(Universidad Autonoma Metropolitana-Iztapalapa, 2019-01-01) Gamboa-Suasnavart R.A.; Marín-Palacio L.D.; López-Griego L.; Córdova-Aguilar M.S.; Valdez-Cruz N.A.; Trujillo-Roldán M.A.; Universidad EAFIT. Departamento de Ciencias; Ciencias Biológicas y Bioprocesos (CIBIOP)
The filamentous morphology of Streptomyces lividans depends on the culture conditions, affecting the production, secretion and post-translational modifications of recombinant glycoproteins. In this work, the previously reported volumetric power input (P/V) in conventional (NF) and coiled (CF) shake flasks were scaled-up to a stirred bioreactor. The effects on the growth and morphology of S. lividans were analyzed, as well as, the production and O-mannosylation of the recombinant APA glycoprotein from Mycobacterium tuberculosis. Specific growth rates of 5. lividans and similar recombinant glycoprotein (rAPA) yields were observed between NF and bioreactor cultures. In addition, we have found up to seven mannose residues attached to the C-terminal of the rAPA in bioreactor cultures, one more than in NF and CF. However, at similar P/V values, morphological and kinetic differences were found. Our data indicate that P/V as scale-up criteria in the production of recombinant glycoproteins in S. lividans can be successful in some, but not all the kinetic and stoichiometric parameters, suggesting that the metabolic cell responses can be affected by aeration/hydrodynamics between bioreactor and shake flasks. © 2019, Universidad Autonoma Metropolitana Iztapalapa. All rights reserved.
Volumetric power input as a reliable parameter for scale-up from shake flask to stirred-tank bioreactor: Production of a recombinant glycoprotein by Streptomyces lividans
(Universidad Autonoma Metropolitana-Iztapalapa, 2019-01-01) Gamboa-Suasnavart R.A.; Marín-Palacio L.D.; López-Griego L.; Córdova-Aguilar M.S.; Valdez-Cruz N.A.; Trujillo-Roldán M.A.; Universidad EAFIT. Departamento de Ingeniería de Procesos; Procesos Ambientales (GIPAB)
The filamentous morphology of Streptomyces lividans depends on the culture conditions, affecting the production, secretion and post-translational modifications of recombinant glycoproteins. In this work, the previously reported volumetric power input (P/V) in conventional (NF) and coiled (CF) shake flasks were scaled-up to a stirred bioreactor. The effects on the growth and morphology of S. lividans were analyzed, as well as, the production and O-mannosylation of the recombinant APA glycoprotein from Mycobacterium tuberculosis. Specific growth rates of 5. lividans and similar recombinant glycoprotein (rAPA) yields were observed between NF and bioreactor cultures. In addition, we have found up to seven mannose residues attached to the C-terminal of the rAPA in bioreactor cultures, one more than in NF and CF. However, at similar P/V values, morphological and kinetic differences were found. Our data indicate that P/V as scale-up criteria in the production of recombinant glycoproteins in S. lividans can be successful in some, but not all the kinetic and stoichiometric parameters, suggesting that the metabolic cell responses can be affected by aeration/hydrodynamics between bioreactor and shake flasks. © 2019, Universidad Autonoma Metropolitana Iztapalapa. All rights reserved.

Examinando por Materia "Morphology"

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