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Johnson NAN, Ekumah JN, Ma Y, Akpabli-Tsigbe NDK, Adade SYSS, Manching X, Quaisie J, Kwaw E, Wang C. Optimization of fermentation parameters for the production of a novel selenium enriched mulberry (Morus nigra) wine. Lebensm Wiss Technol 2023. [DOI: 10.1016/j.lwt.2023.114608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
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Loutfi H, Pellen F, Jeune BL, Lteif R, Kallassy M, Brun GL, Abboud M. Interpretation of the bacterial growth process based on the analysis of the speckle field generated by calibrated scattering media. OPTICS EXPRESS 2020; 28:28648-28655. [PMID: 32988131 DOI: 10.1364/oe.400909] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 07/24/2020] [Indexed: 06/11/2023]
Abstract
The speckle imaging technique has been proven to be a reliable and effective method for real-time monitoring of the growth kinetics of any bacterium in suspension. To understand the interaction between the light and the bacterial density, a simulation of the bacterial growth of Bacillus thuringiensis was performed using calibrated microspheres of different concentrations and sizes. Results show that the decrease of speckle grain size with the increase of the medium scattering coefficient reveals the two essential phases of the bacterial growth: the exponential phase where the number of the bacteria increases and the stationary phase where sporulation and cell lysis occur.
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Loutfi H, Pellen F, Le Jeune B, Lteif R, Kallassy M, Le Brun G, Abboud M. Real-time monitoring of bacterial growth kinetics in suspensions using laser speckle imaging. Sci Rep 2020; 10:408. [PMID: 31941947 PMCID: PMC6962325 DOI: 10.1038/s41598-019-57281-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 12/23/2019] [Indexed: 11/09/2022] Open
Abstract
In microbiology, monitoring the growth of any microorganism in culture is important for studying and optimizing the growth kinetics, the biomass and the metabolite production. In this work, we show that laser speckle imaging is a reliable technique that can be used to perform real-time monitoring of bacteria growth kinetic in liquid culture media. Speckle parameters, specifically speckle grain size and the spatial contrast of the speckle images, and standard analytical parameters (optical density, pH and colony forming units) were measured during the culture of different strains of Bacillus thuringiensis. Our results show that both speckle grain size and spatial contrast decrease with bacterial growth. Furthermore, speckle parameters are sensitive to the fermentation conditions. Statistical analysis revealed a relatively high correlation between speckle and analytical parameters.
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Affiliation(s)
- Hadi Loutfi
- Physics Department, UR TVA, Faculty of Science, Saint Joseph University, B.P. 11-514, Riad El Solh Beirut, 1107 2050, Lebanon. .,Laboratoire OPTIMAG, IBSAM, Université de Bretagne Occidentale, 6 avenue Le Gorgeu, C.S. 93837, 29238, Brest Cedex, 3, France.
| | - Fabrice Pellen
- Laboratoire OPTIMAG, IBSAM, Université de Bretagne Occidentale, 6 avenue Le Gorgeu, C.S. 93837, 29238, Brest Cedex, 3, France
| | - Bernard Le Jeune
- Laboratoire OPTIMAG, IBSAM, Université de Bretagne Occidentale, 6 avenue Le Gorgeu, C.S. 93837, 29238, Brest Cedex, 3, France
| | - Roger Lteif
- Chemistry Department, UR TVA, Faculty of Science, Saint Joseph University, B.P. 11-514, Riad El Solh Beirut, 1107 2050, Lebanon
| | - Mireille Kallassy
- Faculty of Science, Biotechnology Laboratory, UR EGP, Saint Joseph University, B.P. 11-514, Riad El Solh Beirut, 1107 2050, Lebanon
| | - Guy Le Brun
- Laboratoire OPTIMAG, IBSAM, Université de Bretagne Occidentale, 6 avenue Le Gorgeu, C.S. 93837, 29238, Brest Cedex, 3, France.
| | - Marie Abboud
- Physics Department, UR TVA, Faculty of Science, Saint Joseph University, B.P. 11-514, Riad El Solh Beirut, 1107 2050, Lebanon.
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