• 한국환경과학회지
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• 제25권7호
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• pp.937-950
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• 2016

Algal blooming in 4 major rivers introduces substantial impacts to water front activity. Concentrations of algae are increasing at major points along the Geum River. Ecosystem food webs can be affected by algal blooming because blue-green algae release toxic materials. Even though there have been many studies on blue-green algae, its causality to environmental factors has not been completely determined yet. This study analyzed the exclusive correlation between various hydrometeorological, water quality, and hydrologic variables and the cell number of cyanobacteria to understand causality of blue-green algae in the Geum River. A prewhitening process was introduced to remove the autocorrelation structure and periodicity, which is useful to evaluate the effective relationship between two time series.

• 수산해양교육연구
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• 제28권2호
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• pp.376-383
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• 2016

In this paper, the blue-green algae monitoring program of applying IoT(Internet of things) technologies is designed and implemented that can check out the status of the river's water quality in real time. The proposed system is to extract the image data from the camera of raspberry pi by an wireless network, and it is analyzed through the HSV color model. We measure the temperature using a DS18B20 1-wire temperature sensor. The extracted information of image data and temperature is then analyzed in C and Python programs for use with Raspberry Pi. The XML data in PHP program is made from the analyzed information and provides Web services. It also allows to refer the XML data using mobile devices.

• 생약학회지
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• 제31권2호
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• pp.252-255
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• 2000

In order to screen new radical scavenging principle which is expected to be antiaging drug lead, we have investigated 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity of the marine microalgae, greenalgae(10 speices), diatom (10 speices) and blue-green algae (10 speices). The significant activities$(IC_{50}:\;<100\;{mu}g/ml)$ were observed in 4 species of green algae (MA002, 006, 009, 010), 1 species of diatom (MA015) and 5 species of blue-green algae (MA017, 018, 019, 024, 025). Within the scope of family tested, MA009 $(IC_{50}:\;=78\;{mu}g/ml)$, MA015 $(IC_{50}:\;=38\;{mu}g/ml)$ and MA019 $(IC_{50}:\;=41\;{mu}g/ml)$ displayed the most significant activity. Among the marine microalgae tested at family level, cyanophycean blue-green algae was shown to be the most active family on screening of new bioactive compounds.

• 한국환경과학회지
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• 제18권3호
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• pp.289-298
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• 2009

The blue-green algae which caused odor problem in the tap water are difficult to precipitate in sedimentation basin and clogged the filter void rapidly. The studies of this paper were not only oxidation, coagulation and sedimentation processes for effectively removing blue-green algae but yellow clay and polyamine for verification as coagulants aids. The results of this research are summarized as follows: Higher ozone dose(C) and longer contact time(T) were needed for a high degree of removing blue-green algae efficiency. the removal rate of blue-green algae was proportional to the $C\times T$ value. The removal percent of chlorophyll-a by sedimentation and filter without pre-ozonation was about 75% but 1 mg/L pre-ozonation could increase the removal percent of chlorophyll-a to 99% and more pre-ozonation could remove completely. Though the removal efficiency of turbidity could increased by high dose of chlorination, the dissolved organic carbon was increased. More chlorine dose from 4 to 10 mg/L dissolved organic carbon was decreased. Using yellow clay as coagulant aids increased density of floc so the settling velocity of floc become rising but polyamine could not increase settling velocity of floc though it could formated large floc.

• ALGAE
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• 제19권3호
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• pp.227-234
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• 2004

A study on the dynamics of phytoplankton community and the physico-chemical environmental factors was performed biweekly from April 1998 to March 1999 in Youngchun Dam. A total 72 phytoplankton taxa was identified and dominant taxa were blue-green algae and diatoms. The highest value of phytoplankton standing crop (24,826cells·ml$^{-1}$) was observed in September 7, 1998, the blooming period of blue-green algae Phormidium sp., while the lowest (318cells·ml$^{-1}$) was measured in June 18, 1999. The phytoplankton communities were dominated by blue-green algae of Anabaena planktonica, Microcystis aeruginosa and Phormidium sp. during the summer and autumn periods and were dominated by diatoms of Synedra acus and Aulacoseira spp. during the spring and winter periods. Secchi disc transparency, chlorophyll-a, total nitrogen, total phosphorus and silicate concentration were varied in the ranges of 0.4-2.5 m, 2.4-32.2mg·m$^{-1}$, 0.845-2.352mg·l$^{-1}$, 0.005-0.093mg·l$^{-1}$, 0.2-15.7mg·l$^{-1}$, respectively. The trophic status of Youngchun Dam were estimated eutrophic according to Lake Trophic States Index (LTSI).

• 대한환경공학회지
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• 제35권4호
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• pp.289-293
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• 2013

2002년부터 2012년까지 낙동강 하류 물금지역에서의 식물플랑크톤 우점종의 군집비율 변화를 조사한 결과, 식물플랑크톤 생체량(클로로필-a 농도)은 점진적인 감소 추세였던 반면, 우점종의 개체수는 증가 추세를 나타내었다. 식물플랑크톤 종별로 우점종의 연도별 개체수 비율변화에서 규조류는 감소 추세를 보인 반면, 남조류는 증가 추세를 나타내었다. 또한, 우점기간의 경우 매년 우점기간의 75% 이상을 규조류가 차지하였다. 연중 식물플랑크톤 비율변화에서 규조류는 11월에서 5월까지 매우 높은 우점비율을 보였고, 6월부터 9월까지도 우점일수의 56%~74%를 차지하여 연중 규조류가 300일 정도 우점하였다. 남조류는 6월부터 9월까지 개체수 및 우점기간의 68%~94% 및 26%~36%를 차지하였으며, 녹조류는 4월부터 9월까지 낮은 우점률을 나타내었다. 규조류와 남조류 우점종들의 연중 천이패턴은 규조류의 경우 12월~5월은 Stephanodiscus spp., 5월~10월은 Aulacoseira spp.와 Fragilaria spp.가 대부분 우점하였으며, 남조류의 경우 5월~11월에 Microcystis spp.가 대부분을 우점하였다. 또한, 녹조류는 4월~9월에 Actinastrum spp., Pediastrum spp., Micractinium spp. 및 Pandorina spp.가 우점하였다.

• 한국환경과학회지
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• 제24권4호
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• pp.541-547
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• 2015

Formation of disinfection by-products (DBPs) including trihalomethans (THMs) and haloacetic acids (HAAs) from chlorination of six different species (Chlorella vulgaris, Scenedesmus sp., Anabaena cylindrical, Microcystis aeruginosa, Asterionella formosa and Aulacoseira sp.) of algal extracellular organic matter (EOM). The EOM characteristics evaluation of six algal species reaching at the stationary phase in the growth curve showed most of its SUVA254 showed below 1 and this means hydrophilic organic matter is much higher than hydrophobic organic matter. Chloroform formation potential (CFFP), dichloroacetic acid formation potential (DCAAFP) and trichloroacetic acid formation potential (TCAAFP) were mainly composed of THMFP and HAAFP in the EOM of various algal species. In the case of THMFP/DOC and HAAFP/DOC values, EOM of blue-green algae has appeared highest and EOM of green algae and diatom in order. THMFP/DOC was higher than HAAFP/DOC in EOM of blue-green algae. In comparison of formation potential by unit DOC composed of HAAFP in algal species EOM, DCAAFP/DOC was 1.5 times to 7.5 time higher than TCAAFP/DOC in the EOM of blue-green algae, while DCAAFP/DOC was found to be relatively high compared to TCAAFP/DOC in the EOM of green algae and diatom.

• 자연과학논문집
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• 제6권1호
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• pp.5-39
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• 1993

한국 해산 남조류(Cyanophyta) 의 목록을 작성하고 분류학적 위치를 확인하기 위하여 우리나라 전해역에서 채집된 남조류를 대상으로 형태분류학적 연구를 시도하였다. 그 결과 동정된 한국 해산 남조류는 총 3목 6과 20속 36종이며, 이 중 14종이 우리나라에서 그 생육이 처음으로 확인된 미기록종 (Chroococcus minutus ($K\"{u}$tzing) $N\"{a}$geli, Merismopedia punctata Meyen, Microcystis ichtyoblabe $K\"u$zing, Dermocarpa leibleiniae (Reinsch) Born. et Thur., Hydrocoleum confluens (Setchell et Gardner) Drouet, Lyngbya sordida (Zanard.) Gomont, Phormidium forveolarum (Mont.) Gomont, Phormidium hansgieri Schmidle, Skujaella hildebrandtii (Gomont.) de Toni, Sphaeronema lithophila (Ercegovic) Umezaki, Spirulina tenerrima $K\"u$tzing, Hormothamnion enteromorphoides Grunow, Michrochaete aeruginea Batters, Michrochaete grisea Thuret ex Born. et flah.)이었다. 본 연구에서는 간섭현미경과 위상차현미경을 이용하여 체형이 미소한 남조류의 현미사진을 작성하였다. 형태학적으로 분류된 각 종을 대상으로 세포내 함유물을 관찰하여 그 중 PHB ($poly-\SS$-hydroxybutyrate) granule의 존재 유무를 조사하였으며, Lyngbya confervoides, Lyngbya semiplena, Phormidium corium, Sirocoleum kurzii, Hormothanmnion enteromorphoides, Calothrix crustacea들은 PHB를 함유하고 있음이 확인되었다. 이 결과는 생리생화학적 특성을 기초로한 남조류의 분류체계를 정립하기 위한 자료로 활용될 수 있을 것이다.

• 한국잡초학회지
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• 제12권2호
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• pp.166-172
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• 1992

전국(全國) 논에 발생(發生)하는 부유성(浮遊性) 남조류(藍藻類)와 토양중(土壤中)에 서식(棲息)하면서 괴불 등(等)을 일으키는 남조류(藍藻類)를 1991년(年) 채집(採集) 동정(同定)하여 다음과 같은 결과(結果)을 얻었다. 1. 논에 서식(棲息)하는 남조중(藍藻中)에서 남조식물문(藍藻植物門)(Cyanophyta)으로 분류(分類) 동정(同定)된 종(種)은 소구체과(小球體科)(Chroococceaceae) 7종(種), 카마에시폰과(科)(Chamaesiphonaceae) 1종(種), 플레우로캅사과(科)(Pleurocapsaceae) 1종(種), 염주말科(Nostocaceae) 6종(種), 흔들말과(科) (Oscillatoriaceae) 5(종)種으로서 총(總) 5과(科)14속(屬) 20종(種)이었다. 2. 논에 서식(棲息)하며 질소(窒素) 고정능력(固定能力)이 있는 남조류(藍藻類)로서 Cylindrospermum, Anabaenopsis, Anabaena, Nostoc 등(等) 4속(屬) 6종(種)이 동정(同定)되었다. 3. 남색(藍色)을 띄는 괴불에는 사상(絲狀) 남조류(藍藻類) gms들말(Oscillatona) 등(等)이 주종(主種)을 이루고 있었다. 4. 단세포성(單細胞性) 남조류(藍藻類) Chamaesiphon은 서산(瑞山) 간척지(干拓地)에 많이 발생(發生)하는 Cladophora 등(等)에 부착생활(附着生活)하고 있었다. 5. Spirulina와 Oscillatona는 특유(特有)한 방법(方法)의 운동성(運動性)을 가지고 있었다.

• ALGAE
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• 제18권2호
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• pp.135-143
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• 2003

The seasonal dynamics of phytoplankton and trophic state were evaluated weekly at three sites in the Lake Unmoon from May to November 2001. The seasonal succession pattern of phytoplankton community in the Lake Unmoon showed that the dominant species were; i) diatoms during the late spring, ii) dinoflagellates in June, iii) blue green algae, diatoms and dinoflagellates in July, iv) green algae and blue green algae in August, v) blue green algae in September and early November, and vi) diatoms in November. Members of Microcystis were dominant from middle August to late October and members of Aulocoseira appeared as important species in autumn in the Lake Unmoon. The concentration of chlorophyll-a ranged from 2.4 to 23.0 mg ${\cdot}m^{-3}$ (average: 8.6 mg ${\cdot}m^{-3}$) during the study period. Concentrations of total phosphorus were high during the period from July to November with the maximum of 0.028 mg ${\cdot} l^{-1}$. The average N/P ratio was 121, indicating that concentrations of phosphorus may determine the high algal biomass in the Lake Unmoon. Concentrations of silicate were higher in the Lake Unmoon (average value: 10.016 mg ${\cdot}$ l-) than in other lakes (average values: 1.074-4.408 mg ${\cdot}$ l-), suggesting high potential of diatom growth. The average trophic state index in the Lake Unmoon was 52, which was close to eutrophic state, and the trophic state trend was increasing steadily since 1999.