https://revistas.javeriana.edu.co/index.php/scientarium <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> Pontificia Universidad Javeriana en-US Universitas Scientiarum 0122-7483 <p><span id="aui_3_4_0_1_969" class="textos"><span id="aui_3_4_0_1_1007" style="line-height: 1.4;"><strong>Univ. Sci.</strong> is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights. Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.</span></span></p> https://revistas.javeriana.edu.co/index.php/scientarium/article/view/37816 <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> José Leonardo Cano Botero Yeferson Ospina Balvuena Jorge Andrés Gutiérrez Cifuentes María del Pilar Sepulveda Nieto Eunice Ríos Vásquez Copyright (c) 2024 José Leonardo Cano Botero, Yeferson Ospina Balvuena, JORGE GUTIERREZ, María del Pilar Sepulveda Nieto, Eunice Ríos Vásquez http://creativecommons.org/licenses/by-nc/4.0 2024-05-21 2024-05-21 29 2 108 125 10.11144/Javeriana.SC292.ooan https://revistas.javeriana.edu.co/index.php/scientarium/article/view/37750 <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> Luis Mejias Jorge Enrique Vielma Copyright (c) 2024 Luis Mejias, Jorge Enrique Vielma http://creativecommons.org/licenses/by-nc/4.0 2024-05-04 2024-05-04 29 2 97 106 10.11144/Javeriana.SC292.taso