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Najjarzadeh, Nasim
Publications (1 of 1) Show all publications
Najjarzadeh, N., Krige, A., Pamidi, T. R., Johansson, Ö., Enman, J., Matsakas, L., . . . Christakopoulos, P. (2020). Numerical modeling and verification of a sonobioreactor and its application on two model microorganisms. PLoS ONE, 15(3), Article ID e0229738.
Open this publication in new window or tab >>Numerical modeling and verification of a sonobioreactor and its application on two model microorganisms
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2020 (English)In: PLoS ONE, E-ISSN 1932-6203, Vol. 15, no 3, article id e0229738Article in journal (Refereed) Published
Abstract [en]

Ultrasound has many uses, such as in medical imaging, monitoring of crystallization, characterization of emulsions and suspensions, and disruption of cell membranes in the food industry. It can also affect microbial cells by promoting or slowing their growth and increasing the production of some metabolites. However, the exact mechanism explaining the effect of ultrasound has not been identified yet. Most equipment employed to study the effect of ultrasound on microorganisms has been designed for other applications and then only slightly modified. This results in limited control over ultrasound frequency and input power, or pressure distribution in the reactor. The present study aimed to obtain a well-defined reactor by simulating the pressure distribution of a sonobioreactor. Specifically, we optimized a sonotrode to match the bottle frequency and compared it to measured results to verify the accuracy of the simulation. The measured pressure distribution spectrum presented the same overall trend as the simulated spectrum. However, the peaks were much less intense, likely due to non-linear events such as the collapse of cavitation bubbles. To test the application of the sonobioreactor in biological systems, two biotechnologically interesting microorganisms were assessed: an electroactive bacterium, Geobacter sulfurreducens, and a lignocellulose-degrading fungus, Fusarium oxysporum. Sonication resulted in increased malate production by Gsulfurreducens, but no major effect on growth. In comparison, morphology and growth of Foxysporum were more sensitive to ultrasound intensity. Despite considerable morphological changes at 4 W input power, the growth rate was not adversely affected; however, at 12 W, growth was nearly halted. The above findings indicate that the novel sonobioreactor provides an effective tool for studying the impact of ultrasound on microorganisms.

Place, publisher, year, edition, pages
PLOS, 2020
National Category
Bioprocess Technology Fluid Mechanics and Acoustics
Research subject
Biochemical Process Engineering; Engineering Acoustics
Identifiers
urn:nbn:se:ltu:diva-78111 (URN)10.1371/journal.pone.0229738 (DOI)32160222 (PubMedID)2-s2.0-85081204531 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-03-26 (alebob)

Available from: 2020-03-19 Created: 2020-03-19 Last updated: 2020-03-26Bibliographically approved
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