Effects of acute γ-irradiation on the aquatic microbial microcosm in comparison with chemicals

Fuma, Shoichi; Ishii, Nobuyoshi; Takeda, Hiroshi; Miyamoto, Kiriko; Yanagisawa, Kei; Doi, Kazutaka; Kawaguchi, Isao; Tanaka, Nobuyuki; Inamori, Yuhei; Polikarpov, G.G.

doi:10.1016/j.jenvrad.2009.06.007

Cited by 21 publications

(7 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, when the microalgal cells were exposed to high doses of γ-rays, the cells disintegrated, or broken down, if it loses their ability to self-repair and failed to recover completely (Agarwal, Rane, & Sainis, 2008;Kovacs & Keresztes, 2002). Whereas under low irradiation doses, cells were still slightly damaged and within a short time the cells recovered to normal levels (Fuma et al, 2009). Furthermore, protein synthesis was noted to decrease with increasing irradiation dose, which may lead to an enhancement of the photosynthetic photoinhibition (Agarwal et al, 2008).…”

Section: Gamma Radiationmentioning

confidence: 99%

Effect of nutrients and gamma radiation on growth and lipid accumulation of Chlorella vulgaris for biodiesel production

Abo-State

Shanab

Ali

2019

Journal of Radiation Research and Applied Sciences

View full text Add to dashboard Cite

The present work investigated the effects of nitrogen (N), phosphorus (P), magnesium (Mg), carbonate (CO 3) concentrations and gamma radiation doses on growth and lipid production of Chlorella vulgaris. The obtained results showed that culture conditions have highly significant effects on biomass and lipid accumulation. The maximum lipid content was observed at 350, 40, 150,20 mg L −1 of N, P, Mg, and CO 3 concentrations, respectively. While the highest biomass yield was achieved at high N and P as well as reduced Mg and CO 3 concentrations. Whereas gamma radiation showed a negative effect. Lipid profile recorded maximum saturated (SFAs, 62.44%) and unsaturated fatty acids (UFAs, 37.56%) with palmitic acid (C16:0), linoleic acid (C18:2), pentadecanoic acid (C15:0), palmitoleic acid (C16:1) and oleic acid (C18:1) as predominant fatty acids, which prove that Chlorella vulgaris is a promising feedstock for biodiesel production.

show abstract

Section: Gamma Radiationmentioning

confidence: 99%

Effect of nutrients and gamma radiation on growth and lipid accumulation of Chlorella vulgaris for biodiesel production

Abo-State

Shanab

Ali

2019

Journal of Radiation Research and Applied Sciences

View full text Add to dashboard Cite

show abstract

“…The following mechanisms were speculated: (1) mitigation of competition for light, CO 2 and inorganic nutrients with the green algae Chlorella sp. and Scenedesmus sp., (2) decrease in grazing pressure by A. hemprichi and (3) increase in breakdown products such as CO 2 and inorganic nutrients originating from dead organisms (Fuma et al, 2009). It is likely that these mechanisms also account for the Tolypothrix sp.…”

Section: Discussionmentioning

confidence: 99%

Effects of acute γ-irradiation on community structure of the aquatic microbial microcosm

Fuma¹,

Ishii²,

Takeda³

et al. 2010

Journal of Environmental Radioactivity

Self Cite

View full text Add to dashboard Cite

“…The survival recovery percentage decreased with the increasing γ radiation dosages, indicating that microalgae had a higher mortality rate under higher radiation intensity. This was because γ rays from nuclear radiation generate oxidative stress on thylakoid structures in microalgal cells, thereby impacting the PSII and Calvin cycle, or even causing death (Fuma et al, 2009). Meanwhile, photosynthesis of the remaining cells was more likely to be affected under higher radiation intensity, thus generating more phenotypes.…”

Section: Mutating and Screening Nannochloropsismentioning

confidence: 99%

Enhancing Photosynthetic Characterization and Biomass Productivity of Nannochloropsis Oceanica by Nuclear Radiation

Cheng

Wang

et al. 2020

Front. Energy Res.

View full text Add to dashboard Cite

Microalgae with a high growth rate and a carbon fixation rate present a promising potential to produce diverse renewable energy products and reduce greenhouse gas emissions. However, some microalgal species may have limited light-use efficiency and specific growth rate. To alleviate these issues, Nannochloropsis oceanica was subjected to 137 Cs-γ radiation to obtain the desired mutant with enhanced light-use efficiency and increased biomass productivity. The N. oceanica mutant ZJU700 showed a 26.7% increase in biomass productivity after nuclear irradiation at a 700 GY dosage. It was found that the mutant had a 30.2% higher oxygen evolution rate than the wild type cells. High-throughput transcriptome sequencing showed that expression of photosynthetic related genes in the mutant were much higher than in wild type cells. Expression of the psbO gene increased by 455% in mutant ZJU700, contributing to an increased oxygen evolution rate by splitting water. Three up-regulated genes, namely petC, petF, and petH, resulted in enhanced electron transport during the photoreaction process. Up-regulation of many genes involved in the Calvin cycle indicated that CO 2 fixation rate was likely to be increased to produce more carbohydrates in mutant, thereby contributing to the increased biomass productivity in mutant ZJU700.

show abstract

Effects of acute γ-irradiation on the aquatic microbial microcosm in comparison with chemicals

Cited by 21 publications

References 21 publications

Effect of nutrients and gamma radiation on growth and lipid accumulation of Chlorella vulgaris for biodiesel production

Effect of nutrients and gamma radiation on growth and lipid accumulation of Chlorella vulgaris for biodiesel production

Effects of acute γ-irradiation on community structure of the aquatic microbial microcosm

Enhancing Photosynthetic Characterization and Biomass Productivity of Nannochloropsis Oceanica by Nuclear Radiation

Contact Info

Product

Resources

About