https://revistas.javeriana.edu.co/index.php/scientarium/issue/feed 2024-05-08T00:00:00-05:00 Angela Jhoana Espejo Mojica editorus@javeriana.edu.co Open Journal Systems <p><strong>Universitas Scientiarum:</strong> (ISSN: 0122-7483; E-ISSN: 2027-1352) is a multidisciplinary, Open-Acces, peer-reviewed, first-online journal devoted to the promotion of the recent progress in all fields of exact and natural sciences. The objective of Universitas Scientiarum is to publish timely (three times per year: April, August, and December), useful and informative results that will be of value to a general audience. All articles published in Universitas Scientiarum have undergone rigorous peer review by at least two international anonymous referees. Universitas Scientiarum was founded in 1987 by the Faculty of Sciences of the Pontificia Universidad Javeriana, Bogotá D.C., Colombia.</p> https://revistas.javeriana.edu.co/index.php/scientarium/article/view/37816 2023-08-14T14:22:15-05:00 José Leonardo Cano Botero jlcanob@uqvirtual.edu.co Yeferson Ospina Balvuena yospina@uniquindio.edu.co Jorge Andrés Gutiérrez Cifuentes JGUTIERREZ@UNIQUINDIO.EDU.CO María del Pilar Sepulveda Nieto msepulveda@uniquindio.edu.co Eunice Ríos Vásquez erios@uniquindio.edu.co

<p>Renealmia is a tropical plant genus within the Zingiberaceae family. In tropical South America, Renealmia plants are known for their therapeutic uses against bone and muscle pain, colds, and to counteract snake bite symptoms. Despite the biomedical importance of Renealmia metabolites, the components of their essential oils (EO) have been scarcely studied, and a cause thereof is the lack of local efficient, inexpensive, and environmentally friendly EO extraction methods. This work addressed the optimization of an EO extraction method from the aerial parts and rhizomes of Renealmia ligulata plants based on microwave-assisted hydrodistillation (MAHD) with an ultrasound-assisted extraction (UAE) pretreatment. Three MAHD extraction variables (radiation power, radiation exposure length, and solvent volume) were studied on their own and in combination using a response surface analysis to determine the value combinations leading to optimal EO yields. The results showed that the best average extraction duration time was 42.5 min, combined with a radiation power of 765 W and a solvent volume 225.9 mL for 30 g of aerial part plant material or 799 W and 145 mL of solvent for 20 g of plant rhizomes. A GC-MS analysis of the obtained R. ligulata EOs revealed that their main component was epi-Eudesmol (28% in plant aerial parts and 13% in rhizomes), which is a molecule of interest considering its reported neuro-protective properties. </p>

2024-05-21T00:00:00-05:00 Copyright (c) 2024 José Leonardo Cano Botero, Yeferson Ospina Balvuena, JORGE GUTIERREZ, María del Pilar Sepulveda Nieto, Eunice Ríos Vásquez https://revistas.javeriana.edu.co/index.php/scientarium/article/view/37750 2023-07-28T18:13:25-05:00 Luis Mejias lfmejias@espol.edu.ec Jorge Enrique Vielma jevielma@espol.edu.ec

<p>In this paper we prove that every T0 Alexandroff topological space (X, τ ) is homeomorphic to the avoidance of a subspace of (Spec(Λ), τ_Z), where Spec(Λ) denotes the prime spectrum of a semi-ring Λ induced by τ and τ_Z is the Zariski topology. We also prove that (Spec(Λ), τ_Z) is an Alexandroff space if and only if Λ satisfies the Gilmer property.</p>

2024-05-04T00:00:00-05:00 Copyright (c) 2024 Luis Mejias, Jorge Enrique Vielma