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Guzmán-Armenteros TM, Ruales J, Villacís-Chiriboga J, Guerra LS. Experimental Prototype of Electromagnetic Emissions for Biotechnological Research: Monitoring Cocoa Bean Fermentation Parameters. Foods 2023; 12:2539. [PMID: 37444278 DOI: 10.3390/foods12132539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 06/19/2023] [Accepted: 06/24/2023] [Indexed: 07/15/2023] Open
Abstract
A Helmholtz-type electromagnetic emission device, which uses an oscillating magnetic field (OMF), with potential applications in biotechnological research, was built and validated. The coils were connected to an alternating current (AC) generator to generate a 0.5 to 110 mT field at their center. OMF measurements were performed with a Hall effect sensor with a digital signal connection (Arduino nano) and data output to a PC using LabVIEW v2017SP1 software. The fermentation process of the cocoa bean variety CCN 51, exposed to four levels of OMF density for 60 min (0, 5, 40, and 80 mT/60 min), was analyzed. Different variables of the grain fermentation process were evaluated over six days. The ANOVA test probed the device's linearity, accuracy, precision, repeatability, reliability, and robustness. Moreover, CCN 51 cocoa beans' EMF-exposure effect was evaluated under different OMF densities for 60 min. The results show the validity of the equipment under working conditions and the impact of EMF (electromagnetic fields) on the yield, deformation, and pH of cocoa beans. Thus, we concluded that the operation of the prototype is valid for use in biotechnological studies.
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Affiliation(s)
| | - Jenny Ruales
- Department of Food Science and Biotechnology, Escuela Politécnica Nacional, Quito P.O. Box 17-01-2759, Ecuador
| | - José Villacís-Chiriboga
- Department of Food Science and Biotechnology, Escuela Politécnica Nacional, Quito P.O. Box 17-01-2759, Ecuador
| | - Luis Santiago Guerra
- Carrera de Medicina, Facultad de Ciencias Médicas, Universidad Central del Ecuador, Quito P.O. Box 17-12-759, Ecuador
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Li H, Xie R, Xu X, Liao X, Guo J, Fang Y, Fang Z, Huang J. Static Magnetic Field Inhibits Growth of Escherichia coli Colonies via Restriction of Carbon Source Utilization. Cells 2022; 11:cells11050827. [PMID: 35269449 PMCID: PMC8909705 DOI: 10.3390/cells11050827] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 02/21/2022] [Accepted: 02/21/2022] [Indexed: 02/01/2023] Open
Abstract
Magnetobiological effects on growth and virulence have been widely reported in Escherichia coli (E. coli). However, published results are quite varied and sometimes conflicting because the underlying mechanism remains unknown. Here, we reported that the application of 250 mT static magnetic field (SMF) significantly reduces the diameter of E. coli colony-forming units (CFUs) but has no impact on the number of CFUs. Transcriptomic analysis revealed that the inhibitory effect of SMF is attributed to differentially expressed genes (DEGs) primarily involved in carbon source utilization. Consistently, the addition of glycolate or glyoxylate to the culture media successfully restores the bacterial phenotype in SMF, and knockout mutants lacking glycolate oxidase are no longer sensitive to SMF. These results suggest that SMF treatment results in a decrease in glycolate oxidase activity. In addition, metabolomic assay showed that long-chain fatty acids (LCFA) accumulate while phosphatidylglycerol and middle-chain fatty acids decrease in the SMF-treated bacteria, suggesting that SMF inhibits LCFA degradation. Based on the published evidence together with ours derived from this study, we propose a model showing that free radicals generated by LCFA degradation are the primary target of SMF action, which triggers the bacterial oxidative stress response and ultimately leads to growth inhibition.
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Affiliation(s)
- Haodong Li
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai 200234, China; (H.L.); (R.X.); (X.X.); (X.L.); (J.G.)
| | - Runnan Xie
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai 200234, China; (H.L.); (R.X.); (X.X.); (X.L.); (J.G.)
| | - Xiang Xu
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai 200234, China; (H.L.); (R.X.); (X.X.); (X.L.); (J.G.)
| | - Xingru Liao
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai 200234, China; (H.L.); (R.X.); (X.X.); (X.L.); (J.G.)
| | - Jiaxin Guo
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai 200234, China; (H.L.); (R.X.); (X.X.); (X.L.); (J.G.)
| | - Yanwen Fang
- Heye Health Industrial Research Institute, Zhejiang Heye Health Technology, Anji, Huzhou 313300, China; (Y.F.); (Z.F.)
| | - Zhicai Fang
- Heye Health Industrial Research Institute, Zhejiang Heye Health Technology, Anji, Huzhou 313300, China; (Y.F.); (Z.F.)
| | - Jirong Huang
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai 200234, China; (H.L.); (R.X.); (X.X.); (X.L.); (J.G.)
- Correspondence:
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Serrano G, Miranda-Ostojic C, Ferrada P, Wulff-Zotelle C, Maureira A, Fuentealba E, Gallardo K, Zapata M, Rivas M. Response to Static Magnetic Field-Induced Stress in Scenedesmus obliquus and Nannochloropsis gaditana. Mar Drugs 2021; 19:md19090527. [PMID: 34564189 PMCID: PMC8468276 DOI: 10.3390/md19090527] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 09/07/2021] [Accepted: 09/13/2021] [Indexed: 01/20/2023] Open
Abstract
Magnetic fields in biological systems is a promising research field; however, their application for microalgae has not been fully exploited. This work aims to measure the enzymatic activity and non-enzymatic activity of two microalgae species in terms of superoxide dismutase (SOD), catalase (CAT), and carotenoids, respectively, in response to static magnetic fields-induced stress. Two magnet configurations (north and south) and two exposure modes (continuous and pulse) were applied. Two microalgae species were considered, the Scenedesmus obliquus and Nannochloropsis gaditana. The SOD activity increased by up to 60% in S. obliquus under continuous exposure. This trend was also found for CAT in the continuous mode. Conversely, under the pulse mode, its response was hampered as the SOD and CAT were reduced. For N. gaditana, SOD increased by up to 62% with the south configuration under continuous exposure. In terms of CAT, there was a higher activity of up to 19%. Under the pulsed exposure, SOD activity was up to 115%. The CAT in this microalga was increased by up to 29%. For N. gaditana, a significant increase of over 40% in violaxanthin production was obtained compared to the control, when the microalgae were exposed to SMF as a pulse. Depending on the exposure mode and species, this methodology can be used to produce oxidative stress and obtain an inhibitory or enhanced response in addition to the significant increase in the production of antioxidant pigments.
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Affiliation(s)
- Génesis Serrano
- Laboratorio de Biotecnología Ambiental Aplicada, Departamento de Biotecnología, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile; (G.S.); (C.M.-O.); (A.M.); (M.Z.)
| | - Carol Miranda-Ostojic
- Laboratorio de Biotecnología Ambiental Aplicada, Departamento de Biotecnología, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile; (G.S.); (C.M.-O.); (A.M.); (M.Z.)
| | - Pablo Ferrada
- Centro de Desarrollo Energético Antofagasta, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile;
- Correspondence: (P.F.); (M.R.)
| | - Cristian Wulff-Zotelle
- Laboratorio de Biología Celular, Molecular y Genética, Departamento Biomédico, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile;
| | - Alejandro Maureira
- Laboratorio de Biotecnología Ambiental Aplicada, Departamento de Biotecnología, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile; (G.S.); (C.M.-O.); (A.M.); (M.Z.)
| | - Edward Fuentealba
- Centro de Desarrollo Energético Antofagasta, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile;
| | - Karem Gallardo
- Centro de Investigación Tecnológica de Agua en el Desierto (CEITSAZA), Universidad Católica del Norte, Av. Angamos 0610, Antofagasta 1270709, Chile;
| | - Manuel Zapata
- Laboratorio de Biotecnología Ambiental Aplicada, Departamento de Biotecnología, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile; (G.S.); (C.M.-O.); (A.M.); (M.Z.)
| | - Mariella Rivas
- Laboratorio de Biotecnología Ambiental Aplicada, Departamento de Biotecnología, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile; (G.S.); (C.M.-O.); (A.M.); (M.Z.)
- Correspondence: (P.F.); (M.R.)
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Zhu YM, Ji H, Ren H, Geng J, Xu K. Enhancement of static magnetic field on nitrogen removal at different ammonium concentrations in a sequencing batch reactor: Performance and biological mechanism. CHEMOSPHERE 2021; 268:128794. [PMID: 33139049 DOI: 10.1016/j.chemosphere.2020.128794] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 10/14/2020] [Accepted: 10/25/2020] [Indexed: 06/11/2023]
Abstract
This study aimed to investigate the effects and biological mechanism of external static magnetic fields (SMFs) on enhancing nitrogen removal at different influent ammonium nitrogen (NH4+) concentrations. Four sequential batch reactors (SBRs) with SMFs of 0, 15, 30, and 50 mT were operated continuously for 196 days, during which the influent NH4+-N concentration increased stepwise as 50, 100, 350, and 600 mg L-1. The results showed that 50 mT had optimum effects on enhancing nitrogen removal, especially at high NH4+-N concentrations (350 and 600 mg L-1). The biological mechanism by which SMF influences nitrogen removal varies depending on the NH4+ concentration. At low NH4+-N concentrations (50 and 100 mg L-1), a field of 50 mT increased key enzyme activities and corresponding functional gene abundances. Additionally, it further improved functional bacterial abundances, which involved nitrifying and denitrifying bacteria at high NH4+ concentrations. These findings could provide guidance for the selection of optimum SMF intensity at different influent NH4+ concentrations.
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Affiliation(s)
- Yuan-Mo Zhu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Hongmin Ji
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Jinju Geng
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Ke Xu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China.
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Deng Y. Editorial: Surmounting challenges in natural and engineered water systems. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2020; 92:1102-1103. [PMID: 32666558 DOI: 10.1002/wer.1390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Accepted: 06/29/2020] [Indexed: 06/11/2023]
Affiliation(s)
- Yang Deng
- Department of Earth and Environmental Studies, Montclair State University, Montclair, New Jerey, United States
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