Effects of low- or medium-pressure ultraviolet lamp irradiation on Microcystis aeruginosa and Anabaena variabilis

Sakai, Hiromitsu; Oguma, Kumiko; Katayama, Hiroyuki; Ohgaki, Shinichiro

doi:10.1016/j.watres.2006.09.025

Cited by 52 publications

(14 citation statements)

References 23 publications

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“…UV-C radiation, unlike UV-A and UV-B, is completely filtered by the ozone layer and is considered to be the most harmful to living beings due to its highly energetic photons. Its strong germicidal effect causes irreversible damage to photosynthetic organisms (Adhikary & Sahu, 1998;Danon & Gallois, 1998;Jayakumar et al, 1999;Zvezdanović et al, 2009) and, in the case of algae and cyanobacteria, it has been demonstrated that this type of radiation has the potential to cause serious damage in the cell constituents involved in photosynthesis (Alam et al, 2001;Moharikar et al, 2006;Sakai et al, 2007;Tao et al, 2010Tao et al, , 2013Ou et al, 2011Ou et al, , 2012 (works cited in Borderie et al, 2014a). It is therefore used mainly as biocidal and disinfectant lighting in several sectors such as medicine, the food industry and water treatment (Borderie et al, 2014a).…”

Section: Ultraviolet Radiation (Uv-c)mentioning

confidence: 99%

The lampenflora in show caves and its treatment: an emerging ecological problem

Estévez¹,

Moreno-Merino²,

Román³

et al. 2019

IJS

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The artificial lighting of caves adapted for touristic visits, leads to the appearance and propagation of a complex community of phototrophic organisms known as "lampenflora". Formed mainly by algae and cyanobacteria, they produce the degradation of the colonized substrates and decrease the show value of the caves. This phenomenon became famous worldwide in the 1960s due to the damage caused to the paintings in the Lascaux Cave (France). Since then it has become an issue of serious concern to both managers of show caves and to the international scientific community. Over time, the problem has been approached following two complementary strategies: preventing colonization by the invading organisms or eliminating them once they have become established through the use of chemical products, mainly biocides and strong oxidants. This kind of treatment generates pollutant effluents that can move the problem from the walls of the caves to the groundwater. This paper presents a critical literature review of the problem and the proposed solutions, and emphasizes the need for further study of the optimal doses of treatment chemicals and to develop quantitative methods to determine their effectiveness. . The lampenflora in show caves and its treatment: an emerging ecological problem.

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Section: Ultraviolet Radiation (Uv-c)mentioning

confidence: 99%

The lampenflora in show caves and its treatment: an emerging ecological problem

Estévez¹,

Moreno-Merino²,

Román³

et al. 2019

IJS

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“…Although it was shown that the mechanisms of UVC irradiation for elimination of M. aeruginosa included the destruction of photosystems (Sakai et al, 2007a), the exact mechanism of photodamage by UVC was still a controversial issue as there are two possible targets for UV irradiation: the D1 protein (Wu et al, 2011) and manganese cluster (Hakala et al, 2005). To date, no data could be obtained to illustrate the exact lethal mechanism of UVC on cyanobacteria.…”

Section: à2mentioning

confidence: 99%

The combined effects of UV-C radiation and H 2 O 2 on Microcystis aeruginosa , a bloom-forming cyanobacterium

Wang

et al. 2015

Chemosphere

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“…This also suggests the inactivation mechanism of M. aeruginosa over 180 mJ cm À2 was not so much related to DNA damage. Previous research suggests DNA damage itself can be repaired even at 1800 mJ cm À2 (Sakai et al 2007). Therefore, possible damage might not be on molecular DNA but on cell metabolism, such as cell membrane or photosynthesis apparatus.…”

Section: Discussionmentioning

confidence: 98%

Effect of photoreactivation on ultraviolet inactivation of Microcystis aeruginosa

Sakai

Katayama

Oguma

et al. 2011

Water Science and Technology

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Microcystis aeruginosa forms algal bloom in lakes. They produce toxic compounds such as microcystin. Against such algal problems, the effect of UV treatment was examined. In UV treatment, the effect of photoreactivation should be examined. Photoreactivation is a repair mechanism of genomic DNA damage by sunlight irradiation. UV treatment causes DNA damages on target cyanobacteria, however sunlight can repair some of these DNA damages. To examine the effect of photoreactivation, both white and yellow light incubations were employed. White light allows both photoreactivation and photosynthesis, while yellow light prohibits photoreactivation and only allows photosynthesis. Microcystis aeruginosa NIES 98 strain and PCC 7806 strain were used as the test cultures. Those cultures were exposed to low-pressure (LP) or medium-pressure (MP) ultraviolet (UV) lamp, then incubated under white or yellow light. Yellow light incubation method was effective to examine photoreactivation. It was revealed that almost six times UV fluence was required to inactivate 99% of Microcystis aeruginosa, under photoreactivation condition, compared with non-photoreactivation condition. Inhibition of photoreactivation could greatly enhance UV treatment efficiency against Microcystis aeruginosa. One of the practical suggestions is to conduct UV treatment at night, when photoreactivation by sunlight rarely takes place. Highly efficient inactivation was achieved by avoiding photoreactivation.

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Effects of low- or medium-pressure ultraviolet lamp irradiation on Microcystis aeruginosa and Anabaena variabilis

Cited by 52 publications

References 23 publications

The lampenflora in show caves and its treatment: an emerging ecological problem

The lampenflora in show caves and its treatment: an emerging ecological problem

The combined effects of UV-C radiation and H 2 O 2 on Microcystis aeruginosa , a bloom-forming cyanobacterium

Effect of photoreactivation on ultraviolet inactivation of Microcystis aeruginosa

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