Evaluación de la actividad antimicrobiana de semillas de Leucaena esculenta y L. leucocephala de la localidad de Tlayacapan, Morelos (México).

Leucaena esculenta y L. leucocephala (Fabaceae) son especies comúnmente conocidas en México como “guajes” y usadas como recursos alimenticio y medicinal para aliviar diferentes enfermedades infecciosas. El objetivo del presente estudio fue la determinación de la actividad antimicrobiana de semillas de L. esculenta y L. leucocephala de la comunidad de Tlayacapan Morelos.  Los extractos fueron obtenidos mediante la técnica de maceración y reducidos por destilación al vacío. La actividad antimicrobiana, fue determinada cualitativa y cuantitativamente en 20 cepas bacterianas, 3 cepas levaduriformes y 4 cepas de hongos miceliados. En las pruebas cualitativas, se encontró actividad antimicrobiana en 6 cepas bacterianas, 1 cepa de hongos levaduriformes y 4 de hongos miceliados. Mediante la técnica de microdilución en caldo, Escherichia coli CUSI mostró valores de CMI de 2000 y 3000 μg/mL para L. leucocephala y L. esculenta respectivamente y para Staphylococcus aureus CUSI, CMI = 4000 y 2000 μg/mL para L. leucocephala y L. esculenta respectivamente, ambas cepas sensibles a los extractos metanólicos. Los valores de CBM para las cinéticas de muerte (6000 μg/mL para L. leucocephala y 4000 μg/mL para L. esculenta) tuvieron efecto significativo en las primeras horas de tratamiento. Por su parte, C. glabrata fue susceptible a los extractos metanólicos con valores de CFM de 4000 μg/mL (L. leucocephala) y 6000 μg/mL (L. esculenta). Mediante la técnica de inhibición del crecimiento radial, fue reportado, que los valores más bajos de CF50 corresponden a los extractos acetónicos de semillas (L. lecucocephala= 2.28 mg/mL y L. esculenta = 2.72 mg/mL) teniendo efecto significativo contra cepas de Trichophyton mentagrophytes y Aspergillus niger respectivamente. En las pruebas cualitativas para la determinación de metabolitos secundarios se encontró la presencia de alcaloides, triterpenos, monoterpenos, esteroides, saponinas y compuestos fenólicos, los cuales reportan potencial antimicrobiano. Los extractos metanólicos y acetónicos de semillas de ambos guajes presentaron actividad biológica significativa sobre diferentes cepas de bacterias y hongos, validando así, el uso medicinal de este recurso por parte de la comunidad de Tlayacapan

Arcopilus aureus MaC7A as a New Source of Resveratrol: Assessment of Amino Acid Precursors, Volatiles, and Fungal Enzymes for Boosting Resveratrol Production in Batch Cultures

The chemical factors that regulate the synthesis of resveratrol (RV) in filamentous fungi are still unknown. This work reports on the RV production by Arcopilus aureus MaC7A under controlled conditions and the effect of amino acid precursors (PHE and TYR), monoterpenes (limonone, camphor, citral, thymol, menthol), and mixtures of hydrolytic enzymes (Glucanex) as elicitors for boosting fungal RV. Batch cultures with variable concentrations of PHE and TYR (50–500 mg L−1) stimulated RV production from 127.9 ± 4.6 to 221.8 ± 5.2 mg L−1 in basic cultures developed in PDB (pH 7) added with 10 g L−1 peptone at 30 °C. Maximum levels of RV and biomass were maintained during days 6–8 under these conditions, whereas a dramatic RV decrease was observed from days 10–12 without any loss of biomass. Among the tested volatiles, citral (50 mg L−1) enhanced RV production until 187.8 ± 2.2 mg L−1 in basic cultures, but better results were obtained with Glucanex (100 mg L−1; 198.3 ± 7.6 mg L−1 RV). Optimized batch cultures containing TYR (200 mg L−1), citral (50 mg L−1), thymol (50 mg L−1), and Glucanex (100 mg L−1) produced up to 237.6 ± 4.7 mg L−1 of RV. Our results suggest that low concentrations of volatiles and mixtures of isoenzymes with β-1, 3 glucanase activity increase the biosynthesis of fungal RV produced by A. aureus MaC7A in batch cultures.</jats:p

Arcopilus aureus MaC7A as a New Source of Resveratrol: Assessment of Amino Acid Precursors, Volatiles, and Fungal Enzymes for Boosting Resveratrol Production in Batch Cultures

The chemical factors that regulate the synthesis of resveratrol (RV) in filamentous fungi are still unknown. This work reports on the RV production by Arcopilus aureus MaC7A under controlled conditions and the effect of amino acid precursors (PHE and TYR), monoterpenes (limonone, camphor, citral, thymol, menthol), and mixtures of hydrolytic enzymes (Glucanex) as elicitors for boosting fungal RV. Batch cultures with variable concentrations of PHE and TYR (50–500 mg L−1) stimulated RV production from 127.9 ± 4.6 to 221.8 ± 5.2 mg L−1 in basic cultures developed in PDB (pH 7) added with 10 g L−1 peptone at 30 °C. Maximum levels of RV and biomass were maintained during days 6–8 under these conditions, whereas a dramatic RV decrease was observed from days 10–12 without any loss of biomass. Among the tested volatiles, citral (50 mg L−1) enhanced RV production until 187.8 ± 2.2 mg L−1 in basic cultures, but better results were obtained with Glucanex (100 mg L−1; 198.3 ± 7.6 mg L−1 RV). Optimized batch cultures containing TYR (200 mg L−1), citral (50 mg L−1), thymol (50 mg L−1), and Glucanex (100 mg L−1) produced up to 237.6 ± 4.7 mg L−1 of RV. Our results suggest that low concentrations of volatiles and mixtures of isoenzymes with β-1, 3 glucanase activity increase the biosynthesis of fungal RV produced by A. aureus MaC7A in batch cultures

Primer Encuentro Internacional sobre la Enseñanza de las Ciencias Exactas y Naturales

Libro de texto completo sobre Primer Encuentro Internacional sobre la Enseñanza de las Ciencias Exactas y Naturale

Pseudomonas aeruginosa antibiotic susceptibility profiles, genomic epidemiology and resistance mechanisms: a nation-wide five-year time lapse analysisResearch in context

Summary: Background: Pseudomonas aeruginosa healthcare-associated infections are one of the top antimicrobial resistance threats world-wide. In order to analyze the current trends, we performed a Spanish nation-wide high-resolution analysis of the susceptibility profiles, the genomic epidemiology and the resistome of P. aeruginosa over a five-year time lapse. Methods: A total of 3.180 nonduplicated P. aeruginosa clinical isolates from two Spanish nation-wide surveys performed in October 2017 and 2022 were analyzed. MICs of 13 antipseudomonals were determined by ISO-EUCAST. Multidrug resistance (MDR)/extensively drug resistance (XDR)/difficult to treat resistance (DTR)/pandrug resistance (PDR) profiles were defined following established criteria. All XDR/DTR isolates were subjected to whole genome sequencing (WGS). Findings: A decrease in resistance to all tested antibiotics, including older and newer antimicrobials, was observed in 2022 vs 2017. Likewise, a major reduction of XDR (15.2% vs 5.9%) and DTR (4.2 vs 2.1%) profiles was evidenced, and even more patent among ICU isolates [XDR (26.0% vs 6.0%) and DTR (8.9% vs 2.6%)] (p < 0.001). The prevalence of Extended-spectrum β-lactamase/carbapenemase production was slightly lower in 2022 (2.1%. vs 3.1%, p = 0.064). However, there was a significant increase in the proportion of carbapenemase production among carbapenem-resistant strains (29.4% vs 18.1%, p = 0.0246). While ST175 was still the most frequent clone among XDR, a slight reduction in its prevalence was noted (35.9% vs 45.5%, p = 0.106) as opposed to ST235 which increased significantly (24.3% vs 12.3%, p = 0.0062). Interpretation: While the generalized decrease in P. aeruginosa resistance, linked to a major reduction in the prevalence of XDR strains, is encouraging, the negative counterpart is the increase in the proportion of XDR strains producing carbapenemases, associated to the significant advance of the concerning world-wide disseminated hypervirulent high-risk clone ST235. Continued high-resolution surveillance, integrating phenotypic and genomic data, is necessary for understanding resistance trends and analyzing the impact of national plans on antimicrobial resistance. Funding: MSD and the Instituto de Salud Carlos III, Ministerio de Ciencia e Innovación and Unión Europea—NextGenerationEU

New landscape of science, technology and innovation

La Ingeniería Química Colombiana está inmersa en nuevos panoramas de Ciencia, Tecnología e Innovación que traen consigo grandes retos para la industria, la academia y el Estado. Las investigaciones multidisciplinarias en energía, materiales, ingeniería de procesos y bioprocesos han llevado a estrategias de emprendimiento e innovación que prometen ser base de desarrollo en el país. En los siguientes capítulos se presentan los resultados más relevantes de las investigaciones realizadas por 19 instituciones colombianas en cooperación con 7 universidades internacionales, así como las contribuciones científicas de numerosas empresas colombianas. Este libro compila 236 resúmenes de investigaciones clasificadas en las siguientes líneas temáticas:1. Bioprocesos - 2. Economía circular - 3. Educación en Ingeniería Química - 4. Emprendimiento e innovación en Ingeniería Química - 5. Energías alternativas - 6. Oil & Gas - 7. Procesos y ciencia - 8. Tecnología en Ingeniería Química y simulación - 9. Tópicos ambientales - 10. MaterialesColombian Chemical Engineering is immersed in new scenarios of Science, Technology and Innovation that bring great challenges for industry, academia and the State. Multidisciplinary research in energy, materials, process engineering and bioprocesses have led to entrepreneurship and innovation strategies that promise to be the basis for development in the country. The following chapters present the most relevant results of the research carried out by 19 Colombian institutions in cooperation with 7 international universities, as well as the scientific contributions of numerous Colombian companies. This book compiles 236 research summaries classified in the following thematic lines: 1. Bioprocesses - 2. Circular economy - 3. Education in Chemical Engineering - 4. Entrepreneurship and innovation in Chemical Engineering - 5. Alternative energies - 6. Oil & Gas - 7. Processes and science - 8. Technology in Chemical Engineering and simulation - 9 Environmental topics - 10. MaterialsUniversidad EA