Repositorio Institucional USAT

Persona

Pamela Huanambal Esquén

Publicación

Antimicrobial Activity of Origanum vulgare Essential Oil against Staphylococcus aureus and Escherichia coli

(Multidisciplinary Digital Publishing Institute (MDPI), 2024-01-01)

Sonia Tejada-Muñoz

;

Denny Cortez

;

Jesús Rascón

;

Segundo G. Chavez

;

Aline C. Caetano

;

Diaz Manchay, Rosa Jeuna

;

Julio Sandoval-Bances

;

Sonia Huyhua-Gutierrez

;

Lizandro Gonzales

;

Stella M. Chenet

;

Rafael Tapia-Limonchi

Background/Objectives: Oreganum vulgare essential oil (OEO) is safe, effective, multifunctional, and widely used. This study aimed to evaluate OEO’s chemical composition and antimicrobial activity in vitro against S. aureus and E. coli. Methods: The composition of OEO was determined by gas chromatography–mass spectrometry (GC-MS). Results: Compounds included monoterpenes with known antimicrobial activity, such as 2-menthen-1-ol (36.33%), linalyl acetate (9.26%), terpinene-4-ol (9.01%), 4-thujanol (6.33%), menthen (5.81%), sabinene (5.18%), and carvacrol methyl ether (5.14%). Conclusions: OEO had a strong antimicrobial activity with a minimum inhibitory concentration (MIC) of 1.90 mg/mL for S. aureus and 0.49 mg/mL for E. coli after 18 h incubation. The minimum bactericidal concentration (MBC) was 7.9 mg/mL against S. aureus and 0.99 mg/mL against E. coli. Thus, OEO could be used as a natural antimicrobial against S. aureus and E. coli infections.

Publicación

Aplicación del ultrasonido para conservar las propiedades antioxidantes de la pitahaya

(Latin American and Caribbean Consortium of Engineering Institutions, 2024-01-01)

Escribano Siesquén, William Enrique

Pitahaya fruit has a considerable content of antioxidant and nutraceutical substances. Traditional techniques and thermal treatments used in fruit processing alter the phytochemical and nutritional components and limit their utilization, so a modern and suitable technology was sought to help preserve its components, finding ultrasound as one of the techniques that favors the preservation of the nutritional properties, bioactivity and antioxidants of the fruit pulp and its derived or processed products. In the processing of the pitahaya, the pulp was extracted by cutting it into slices and freezing it at -50°C, then freeze-drying it for about 49 hours. The dry ground sample was macerated in methanol for 7 days, separated into portions to determine the antioxidant capacity by DPPH method and analyzed by spectrophotometer. In a filtered portion, the antioxidant capacity was determined directly, and other portions were subjected to ultrasound before analysis, evaluating the times, power and frequency of application in order to preserve the natural antioxidant and nutritional composition of the pulp; it was found that the sample to which ultrasound was applied for 20 minutes at 180 W power and 40 kHz frequency was the most relevant to preserve the antioxidant capacity of the pitahaya pulp. © 2024 Latin American and Caribbean Consortium of Engineering Institutions. All rights reserved.

Publicación

Models for R+D+i+e interaction between the university and its context. A Literature Review

(Latin American and Caribbean Consortium of Engineering Institutions, 2024-01-01)

Annie Vidarte

;

Juan Franciosi

;

Karin Melendez

;

Abraham Dávila

The interaction of the university and its context determines the policies to ensure that research and development (R+D) have a positive impact on society. However, innovation and entrepreneurship (I+E) have been generating new scenarios and policies in the university. The aim of this study is to identify models for R+D+i+e interaction between the university and its context. In this research, a systematic mapping study (SMS) was performed in five digital libraries. In the process, 13,561 articles were obtained and 336 articles selected as primary studies. In the literature, 17 interaction models for R+D+i+e interaction between the university and its context were identified. The most reported models are: Industrial University, Triple Helix, Entrepreneurial University, Open Innovation and Stakeholders. Likewise, the main types of activities linked to the identified models are: research, innovation and the combination of research and development. In contrast, there are few for experimental development and entrepreneurship. © 2024 Latin American and Caribbean Consortium of Engineering Institutions. All rights reserved.

Publicación

Sustainability in undergraduate course curricula at Andalusian (Spain) universities: a critical analysis

(Frontiers Media SA, 2024)

Lourdes Aranda

;

Rocío del Pilar Rumiche Chávarry

;

José Manuel Ríos-Ariza

;

Esther Mena-Rodríguez

Education is one of the main tools used to implement sustainable development goals (SDGs). Higher education institutions (HEIs) have a major social responsibility regarding sustainability given the relevance and impact of their educational work and the creation of knowledge through their research. Sustainability is promoted and linked to values, teaching-learning methodologies, and studying of global–local problems. Within this framework, the objective of our research is to determine the presence and means by which sustainability appears in the course curricula of university bachelor’s degrees of the public universities of Andalusia (Spain). The study used quantitative methodology. As in other studies, major deficiencies have been revealed in terms of the inclusion of sustainability in the universities, determining a limited presence of local problems to address sustainability. Thus, Andalusian universities distance themselves from the society and community in which they exist. This may also limit student knowledge of sustainability issues in which they could potentially be relevant participants.

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