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Numerical modeling and verification of a sonobioreactor and its application on two model microorganisms
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.ORCID-id: 0000-0002-3386-701x
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.ORCID-id: 0000-0002-4657-6844
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.ORCID-id: 0000-0003-2955-2776
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2020 (engelsk)Inngår i: PLoS ONE, E-ISSN 1932-6203, Vol. 15, nr 3, artikkel-id e0229738Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
PLOS , 2020. Vol. 15, nr 3, artikkel-id e0229738
HSV kategori
Forskningsprogram
Biokemisk processteknik; Teknisk akustik
Identifikatorer
URN: urn:nbn:se:ltu:diva-78111DOI: 10.1371/journal.pone.0229738PubMedID: 32160222Scopus ID: 2-s2.0-85081204531OAI: oai:DiVA.org:ltu-78111DiVA, id: diva2:1415834
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Validerad;2020;Nivå 2;2020-03-26 (alebob)

Tilgjengelig fra: 2020-03-19 Laget: 2020-03-19 Sist oppdatert: 2020-03-26bibliografisk kontrollert

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Najjarzadeh, NasimKrige, AdolfPamidi, Taraka Rama KrishnaJohansson, ÖrjanEnman, JosefineMatsakas, LeonidasRova, UlrikaChristakopoulos, Paul

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Najjarzadeh, NasimKrige, AdolfPamidi, Taraka Rama KrishnaJohansson, ÖrjanEnman, JosefineMatsakas, LeonidasRova, UlrikaChristakopoulos, Paul
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