• Title/Summary/Keyword: Algicidal activity

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Characteristics of Algicide Produced by Micrococcus luteus SY-13 Inhibiting Cochlodinium polykrikoides and the Effects on Marine Organisms (적조생물 Cochlodinium polykrikoides를 저해하는 Micrococcus luteus SY-13이 생산하는 살조물질의 특성과 해양생물에 미치는 영향)

  • Kim, Min-Ju;Jeong, Seong-Yun;Cha, Mi-Sun;Lee, Sang-Joon
    • Journal of Environmental Science International
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    • v.17 no.4
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    • pp.439-449
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    • 2008
  • Algicidal bacterium was isolated from sea water during the declining period of Cochlodinium polykrikoides blooms and this bacterium had a significant algicidal activity against C. polykrikoides. In this study, algicidal bacterium was identified on the basis of biochemical and chemotaxonomic characteristics, and analysis of 16S rDNA sequences. The algicidal bacterium showed 98.6% homology with Micrococcus luteus ATCC $381^T$. Therefore, this bacterium was designated Micrococcus luteus SY-13. The optimal culture conditions of the algicidal bacterium was $25^{\circ}C$, initial pH 8.0, and 3.0% NaCl concentration. M. luteus SY-13 is assumed to produce secondary metabolites which have algicidal activity. When 10% culture filtrate of this strain was applied to C. polykrikoides ($1.0\;{\times}\;10^4\;cells/ml$) cultures, over 98% of C, polykrikoides cells were destroyed within 6 hours. The culture filtrate of M. luteus SY-13 exhibited similar algicidal activity after heat-treatment at $121^{\circ}C$ for 15 min. While algicidal activity remained in filtrates with pH adjusted to 8.0, loss of algicidal activity occurred when the pHs of filtrates were adjusted to over 9.0 or heat-treated at $121{\times}180^{\circ}C$ for 1 hour. M. luteus SY-13 showed significant algicidal activities against C. polykrikoides (98.9%) and a wide algicidal range against various harmful algal bloom (HAB) species. However, there was no algicidal effect on diatom and marine livefood organisms except Isocrysis galbana. These results suggest that M. luteus SY-13 could be a candidate for use in the control of HABs.

The Algicidal Activity of Arthrobacter sp. NH-3 and its Algicide against Alexandrium catenella and other Harmful Algal Bloom Species (Alexandrium catenella와 유해성 적조종에 대한 Arthrobacter sp. NH-3와 살조물질의 살조능)

  • Jeong, Seong-Yun;Jeoung, Nam Ho
    • Korean Journal of Environmental Agriculture
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    • v.34 no.2
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    • pp.139-148
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    • 2015
  • BACKGROUND: The aim of this study was to isolate and identify algicidal bacterium that tends to kill the toxic dinoflagellate Alexandrium catenella, and to determine the algicidal activity and algicidal range of algicide. METHODS AND RESULTS: Among of algicidal bacteria isolated in this study, NH-3 isolate was the strongest algicidal activity against A. catenella. NH-3 isolate was identified on the basis of biochemical characteristics and analysis of 16S rRNA gene sequences. The NH-3 isolate showed over 99% homology with Arthrobacter oxydans, and was designated as Arthrobacter sp. NH-3. The optimal culture conditions were $25^{\circ}C$, initial pH 7.0, and 2.0% (w/v) NaCl concentration. The algicidal activity of Arthrobacter sp. NH-3 was significantly increased to maximum value in the late of logarithmic phase. Arthrobacter sp. NH-3 showed algicidal activity through indirect attack, which excreted active substance into the culture filtrate. When 10% culture filtrate of NH-3 was applied to A. catenella, 100% of algal cells were destroyed within 30 h. In addition, the algicidal activities were increased in dose and time dependent manners. The pure algicide was isolated from the ethyl acetate extract of the culture filtrate of NH-3 by using silica gel column chromatography and high performance liquid chromatography (HPLC). We investigated the algicidal activity of this algicide on the growth of harmful algal bloom (HAB) species, including A. catenella. As a result, it showed algicidal activity against several HAB species at a concentration of $100{\mu}g/mL$ and had a relatively wide host range. CONCLUSION: Taken together, our results suggest that Arthrobacter sp. NH-3 and its algicide could be a candidate for controlling of toxic and harmful algal blooms.

Isolation and Characterization of Algicidal Bacteria KY1 (살조세균 KY1의 분리와 특성조사)

  • PARK Keun-Young;KIM Mi-Ryung;KIM Sung-Koo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.32 no.4
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    • pp.452-457
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    • 1999
  • Algicidal bacteria were isolated from the mud of south coastal sea of Korean peninsula and screened to evaluate algicidal activity on Cochlodinium polykrikoides. The optimum condition for the development of highest algicidal activity was determined, The optimum sodium chloride concentration for algicidal activity of isolated algicidal bacteria was $3\%$. The optimum temperature, pH and culture time for the highest algicidal activity were $30^{\circ}C$, pH 7 and above 24 hr, respectively. The algicidal activity were significantly increased at the stationary phase of the cell growth and continuously increased up to maximum at the death phase, probably due to the release of algicidal substance by cell Iysis. The effect of zinc ion addition on algicidal activity, was observed and indicated that the substance requires zinc for its activity. The candidate for the algicidal substance may be $\alpha$-mannosidase.

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Screening of Seaweed Extracts for Algicidal Substances Using a Photosensitization Effect (해조류 추출물로부터의 Photosensitizing 효과를 지니는 항 적조물질 탐색)

  • Jin, Hyung-Joo;Jin, Deuk-Hee
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.40 no.3
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    • pp.122-127
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    • 2007
  • Photosensitized extracts of 28 seaweed species were tested in vitro to examine the variation in their algicidal activities against the toxic microalga Cochlodinium polykrikoides. When both seaweed extracts and microalgae were exposed to UV and visible light, methanol extracts of Porphyra yezoensis showed 5.7- and 4.4-fold increasesin light-dependent algicidal activity, respectively. When only seaweed extracts were exposed to both UV (365 nm) and visible light (white lamp) at the same time, methanol extracts of Enteromorpha linza and Carpopeltis affinis showed 3.3- and 3.4-fold increases in algicidal activity, respectively. When UV-photosensitized extracts were left in the dark, the algicidal activity of Ecklonia cava increased 13-fold after 5 h. When visible light-photosensitized extracts were left in the dark, the algicidal activity of Monostroma nitidum increased by 3.3-fold in 1 h.

Algicidal Activity of Substance Purified from Marine Bacteria Metabolites against Cochlodinium polykrikoides

  • Byun Hee-Guk;Jeong Seong-Youn;Park Young-Tae;Lee Won-Jae;Kim Se-Kwon
    • Fisheries and Aquatic Sciences
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    • v.5 no.3
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    • pp.150-155
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    • 2002
  • Marine bacteria producing algicidal substance against Cochlodinium polykrikoides was screened and isolated from seawater. Metabolite of marine bacteria Micrococcus sp. LG-5 showed strong algicidal activity against C. polykrikoides. C. polykrikoides was inhibited above $90\%$ at $5\%$ solution of the metabolite within 24 hrs. Algicidal substance from the metabolite was extracted with ethyl acetate, and then purified by PTLC and reversed-phase HPLC. Algicidal activity of purified compound against C. polykrikoides was above $90\%$ at 3.7, 11.0 and 33.0${\mu}g/mL$ concentration after 12, 9 and 3 hrs, respectively. Ninety percent inhibition of other red tides, Gymnodinium sanguineum and Gyrodinium impudicum was observed when treated with 3.7${\mu}g/mL$ of purified compound within a period of 12 hrs. The microscopic view of red tides treated with purified compound showed the deformations such as cell node cuts and swelling of cells.

Growth Inhibition of the Diatom, Chaetoceros calcitrans by Alteromonas sp. SR-14 (Alteromonas sp. SR-14에 의한 규조 Chaetoceros calcitrans 증식저해)

  • KIM Ji Hoe;PARK Hi Yun;CHO Yong Chul;CHO Myo Heon;CHANG Dong Suck
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.32 no.2
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    • pp.160-164
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    • 1999
  • Algicidal activities of Alteromonas sp. SR-14 against Chaetoceros calcitrans were investigated at various culture conditions. The algicidal activity by Alteromonas sp. SK-14 was dependent on temperature. In mixed culture of C, calcitrans and Alteromonas sp. SR-14 at various temperatures, the algicidal activity of Alteronzonas sp. SR-14 was the highest at $20^{\circ}C$, but not showed algicidal activity above $25^{\circ}C$. With the inoculation of $10^4$ cells/ml of C. calcitrans, the diatom could not grow at the microalgal culture condition until 15 days by the simultaneous inoculation of less than 10 cells/ml of Alteromonas sp. SR-14. Alteromonas sp. SR-14 showed the strongest algicidal activity against logarithmic phase cells of C. calcitrans. During the mixed culture of C. calcitrans and Alteromonas sp. SR-14, supplementation of Conwy medium nutrients, changes of light intensity with 1,300$\~$4,600 lux and agitation with 200 rpm did not affect the algicidal activity.

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Effect of Vibrio alginolyticus on the Algicidal Activity of Shewanella sp. SR-14 (Vibrio alginolyticus가 Shewanella sp. SR-14의 미세조류 증식저해 활성에 미치는 영향)

  • KIM Ji Hoe;PARK Hee Yeon;LEE Tae Seek;KIM Shin-Hee;PARK Jeong Heum;CHANG Dong Suck
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.34 no.5
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    • pp.430-434
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    • 2001
  • The algicidal activity of Shewanella (formerly Alteromonas) sp. SR-14 against diatom, Chaetoceros calcitrans was reported in our previous papers. In this study, the effect of Vibrio alginolyticus on the algicidal activity of Shewanelia sp, SR-14 was examined under the optimum algicidal conditions, i.e., temperature ($21\pm1^{\circ}C$), light intensity (4,000 lux), and light: dark cycle (12 hour: 12 hour). Shewanella sp. SR-14 grew well in the presence or the absence of V. alginolyticus in Conwy medium. Algal growth was only inhibited by Shewanella sp. SR-14. V. alginolyticus did not show the algicidal activity, Growth of C. calcitrans increased synergistically with growth of V. alginolyticus. When the initial inoculum of V. alginolyticus was only 1 log cycle higher than that of Shewanella sp. SR-14, the effect of V. alginolyticus on the algicidal activity of Shewanella sp. SR-14 was insignificant during incubation of mixed culture, i.e., two bacterial species and the alga. However, when V. alginolyticus dominated Shewanella sp. SR-14 by 3 log cycles of bacterial counts, it was found that the strain SR-14 could not inhibited growth of C. calcitrans up to 5 days of incubation.

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Isolation of Marine Bacteria Killing Red Tide Microalgae -III. Algicidal Effects of Marine Bacterium, Micrococcus sp. LG-5 against the Harmful Dinoflagellate, Cochlodinium polykrikoides- (적조생물 살조세균 탐색 -III. 유해성 적조생물 Cochlodinium polykrikoides에 대한 Micrococcus sp. LG-5의 살조 효과-)

  • JEONG Seong-Youn;PARK Young-Tae;LEE Won-Jae
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.33 no.4
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    • pp.331-338
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    • 2000
  • The algicidal effects of marine bacteria were investigated and a strain, which had the strongest algicidal activity against the harmful dinoflagellate, Cochiodinim polykrikoides was selected. The bacterium was isolated in seawater during the period of blooming of C. polykrikoides in Masan Bay. This algicidal bacterium was identified as Micrococcus sp. LG-5 by means of morphological and biochemical tests. The optimal culture conditions of Micrococcus sp, LG-5 were $25^{\circ}C,\;pH 7.0\;and\;3.0{\%}$ NaCl concentration. The algicidal activity of Micrococcus sp. LG-5 was significantly increased to maximum value in the late of logarithmic phase of cell cuture. In addition, the culture filtrate ($pore size,\;0.1{\mu}m$) of Microcoocus sp. LG-5 showed strong algicidal effects. The cell numbers of C. polykikoides were decreased from $1.2{\times}10^4 cells/ml\;to\;less\;than\;2{\times}10^3\;cells/ml$ within 3, 6, 30 hours at the concentrations of culture filtrate $10{\%},\;5{\%}\;and\;1{\%}$, respectively. These results indicated that the algicidal effect was mediated by certain substances released from Microooccus sp. LG-5.

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Isolation and Characteristics of Brachybacterium sp. SY -97 Killing the Harmful Dinoflagellate Cochlodinium polykrikoides (유해적조생물 Cochlodinum polykrikoides를 살멸하는 Brachybacterium sp. SY-97의 분리 및 특성)

  • Kim, Yun-Sook;Jeong, Seong-Yun;Lee, Sang-Joon;Lee, Won-Jae
    • Journal of Environmental Science International
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    • v.18 no.4
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    • pp.435-443
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    • 2009
  • A bacterial strain SY-97 that showed algicidal activity against Cochlodinium polykrikoides was isolated from coastal water of Uljin (eastern coast of Korea) in August, 2005. The isolated strain was identified as Brachybacterium sp. by morphological and biological tests, and analysis of 16S rDNA sequence. The optimal culture conditions for the growth of strain SY-97 were $30^{\circ}C$, initial pH 7.0, and salinity 2.0%. From the result of cell culture insert experiment, Brachybacterium sp. SY-97 is assumed to produce secondary metabolites which have algicidal activity. When 10% culture filtrate of this strain was applied to C. polykrikoides ($1.2{\times}10^4\;cells/m{\ell}$) cultures, 100% of C. polykrikoides cells was destroyed within 15 hours. The released algicides were heat-tolerant to $100^{\circ}C$ and stable in pH $6.0{\sim}10.0$. These results suggest that Brachybacterium sp. SY-97 is potentially useful for controlling outbreaks of C. polykrikoides.

Inhibition of Growth and Microcystin Toxicity, and Characterization of Algicidal Substances from Lactobacillus graminis against Microcystis aeruginosa (Microcystis aeruginosa에 대한 Lactobacillus graminis의 성장 억제능, microcystin 분해 및 살조 물질의 특성)

  • Joo, Jae-Hyoung;Park, Bum Soo;Lee, Eun-Seon;Kang, Yoon-Ho;Han, Myung-Soo
    • Korean Journal of Ecology and Environment
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    • v.49 no.3
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    • pp.176-186
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    • 2016
  • For several decades, lactic acid bacterium (Lactobacillus graminis: LAB) has been generally recognized as safe. To develop the pan-environmental bio-control agent, algicidal activity of the live LAB cell and its culture filtrate (CF) was examined against Microcystis aeruginosa. LAB cells perfectly lysed M. aeruginosa within 3 days, while the CF had a less effect than the live cells, approximately 78% inhibition of algal growth during a same culture period. The concentration of microcystin in alone culture of M. aeruginosa was $7.1{\mu}gL^{-1}$, but gradually increased and leach $158.5{\mu}gL^{-1}$ on 10 days. However, LAB cells clearly decreased the microcystin by $10.3{\mu}gL^{-1}$ in the same period, approximately 93.5%. CF of LAB showed a strong algicidal activity over 75% between pH 2-7, 91.3% by the treatment of proteinase K, 87.8% by below 3 kDa in particle size, and 75.3% by heat treatment, respectively. Of five solvents, fractions of CF passed through solvents diethyl ether and ethyl acetate showed an obvious algicidal activity in the algal-lawn test. Among 5 fractions purified by silica-gel TLC plate, two spots showed a most strong removal activity on M. aeruginosa. Another analysis of GC indicate that CF contained six representative fatty acids. Even though most of these substance have been known as an anti-algal substance against M. aeruginosa, oleic acid is the most effective. These results suggested that the culture filtrate or specific substances, like a fatty acids, in comparison with live L. graminis can be a successful and eco-friendly agent to control Microcystis bloom.