- Ultrasonic Treatment Enhanced Astaxanthin Production of Haematococcus pluvialis
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Yun Hwan Park , Jaewon Park , Jeong Sik Choi , Hyun Soo Kim , Jong Soon Choi , Yoon-E Choi
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J. Microbiol. 2023;61(6):633-639. Published online June 13, 2023
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DOI: https://doi.org/10.1007/s12275-023-00053-5
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In this study, effects of ultrasonic treatment on Haematococcus pluvialis (H. pluvialis) were investigated. It has been confirmed
that the ultrasonic stimulation acted as stress resources in the red cyst stage H. pluvialis cells containing astaxanthin,
result
ing in additional astaxanthin production. With the increase in production of astaxanthin, the average diameter of H.
pluvialis cells increased accordingly. In addition, to determine how ultrasonic stimulation had an effect on the further biosynthesis
of astaxanthin, genes related to astaxanthin synthesis and cellular ROS level were measured. As a result, it was
confirmed that astaxanthin biosynthesis related genes and cellular ROS levels were increased, and thus ultrasonic stimulation
acts as an oxidative stimulus. These results support the notion on the effect of the ultrasonic treatment, and we believe
our novel approach based on the ultrasonic treatment would help to enhance the astaxanthin production from H. pluvialis.
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Citations
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- Effect of Titanium Ion and Resistance Encoding Plasmid of Pseudomonas aeruginosa ATCC 10145
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J. Microbiol. 2006;44(3):255-262.
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DOI: https://doi.org/2388 [pii]
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Abstract
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Titanium and its alloys are technically superior and cost-effective materials, with a wide variety of aerospace, industrial, marine, and commercial applications. In this study, the effects of titanium ions on bacterial growth were evaluated. Six strains of bacteria known to be resistant to both metal ions and antibiotics were used in this study. Two strains, Escherichia coli ATCC 15489, and Pseudomonas aeruginosa ATCC 10145, proved to be resistant to titanium ions. Plasmid-cured P. aeruginosa resulted in the loss of one or more resistance markers, indicating plasmid-encoded resistance. The plasmid profile of P. aeruginosa revealed the presence of a 23-kb plasmid. The plasmid was isolated and transformed into DH5α. Interestingly, the untransformed DH5α did not grow in 300 mg/l titanium ions, but the transformed DH5α grew quite well under such conditions. The survival rate of the transformed DH5α also increased more than 3-fold compared to that of untransformed DH5α.
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