• Title/Summary/Keyword: algae growth

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The Effects of tight Intensity in Producing EPA from Marine Green Algae (해양 녹조류로부터 Eicosapentaenoic acid(EPA) 생산의 최적 광도에 관한 연구)

  • 이현용;강재구
    • Microbiology and Biotechnology Letters
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    • v.17 no.2
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    • pp.170-172
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    • 1989
  • It is preyed that marine algae, Chlorella pyrenoidosa can synthesize about 3.52% of eicosapentaenoic (EPA) of dry cell weight at the light intensity of 10 W/$\m^2$ which is optimal light intensity of producing EPA at $25^{\circ}C$. An equation to predict the amounts of EPA in the culture broth is derived as an exponential form with 0.91 of the correlation factor. The behavior of cell growth follows a photo-inhibition model by showing 12 W/$\m^2$ of saturation light intensity.

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Combined effect of initial biomass density and nitrogen concentration on growth and astaxanthin production of Haematococcus pluvialis (Chlorophyta) in outdoor cultivation

  • Wang, Junfeng;Sommerfeld, Milton R.;Lu, Congming;Hu, Qiang
    • ALGAE
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    • v.28 no.2
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    • pp.193-202
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    • 2013
  • Nitrogen availability and cell density each affects growth and cellular astaxanthin content of Haematococcus pluvialis, but possible combined effects of these two factors on the content and productivity of astaxanthin, especially under outdoor culture conditions, is less understood. In this study, the effects of the initial biomass densities IBDs of 0.1, 0.5, 0.8, 1.5, 2.7, 3.5, and 5.0 g $L^{-1}$ DW and initial nitrogen concentrations of 0, 4.4, 8.8, and 17.6 mM nitrate on growth and cellular astaxanthin content of H. pluvialis Flotow K-0084 were investigated in outdoor glass column photobioreactors in a batch culture mode. A low IBD of 0.1 g $L^{-1}$ DW led to photo-bleaching of the culture within 1-2 days. When the IBD was 0.5 g $L^{-1}$ and above, the rate at which the increase in biomass density and the astaxanthin content on a per cell basis was higher at lower IBD. When the IBD was optimal (i.e., 0.8 g $L^{-1}$), the maximum astaxanthin content of 3.8% of DW was obtained in the absence of nitrogen, whereas the maximum astaxanthin productivity of 16.0 mg $L^{-1}\;d^{-1}$ was obtained in the same IBD culture containing 4.4 mM nitrogen. The strategies for achieving maximum Haematococcus biomass productivity and for maximum cellular astaxanthin content are discussed.

Laboratory cultivation of blue-green algae for use as a food for Lymnaeids the intermediate host of Fasciola hepatica (애기물달팽이의 먹이인 조류(藻類)의 실험실 배양(培養))

  • Lee, Chung-gil;Kim, Sang-ki;Lee, Chai-yong
    • Korean Journal of Veterinary Research
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    • v.32 no.2
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    • pp.239-243
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    • 1992
  • In the present experiment, the blue-green algae, the principal food of the vector snail of Fasciola hepatica were cultured. Mud from good natural habitats was sterilized, made slopes, inoculated with algae from the habitats and maintained in a saturated atmosphere. Under the fluorescent-mercury lamp(100W) at about $20^{\circ}C$ the algal growth was optimal, taking 8 days to fully grow and to be ready for feeding the snails. The algae collected from the habitats and cultured in the laboratory were mainly green.

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Seasonal Growth, Phenology and Spore Shedding in Polysiphonia platycarpa Børgesen (Ceramiales, Rhodophyta) of Visakhapatnam Coast, India

  • Rangaiah, G.Subba;Sudhakar, S.;Kumari, E.Vanilla
    • ALGAE
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    • v.18 no.2
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    • pp.177-181
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    • 2003
  • Variation in seasonal growth, phenology and periodicity in spore shedding in Polysiphonia platycarpa $B{\oslash}rgesen$ occurring on the coast of Visakhapatnam, India, have been described to know the growth behaviour, reproductive periodicity and spore producing capacities. This alga occurs for a short period from December to May in the intertidal region of the Visakhapatnam coast, showing maximum growth during January/February. Tetrasporophytic, carposporophytic and antheridial plants were observed in all months of their occurrence in the field. But the vegetative plants were not seen in January and February and all the plants collected were reproductive. The tetraspore and carpospore shedding was observed during all the six months of their occurrence.

Relationship between growth, respiration and permeability of chlorella cell treated with gibberellic acid (Gibberellic acid에 의한 chlorella의 생장과 호흡 및 투과성과의 관계)

  • 채인기
    • Korean Journal of Microbiology
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    • v.9 no.4
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    • pp.149-154
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    • 1971
  • Effect pf gibberellic acid (GA) on the growth rate, respiratory activity and solute uptake of Chlorella cells were measured and their correlation were discussed. Growth rate and respiratory activity of the algal cells are enhanced considerably by very samll amount (50 ppm) of GA treatment although they are suppressed by relatively higher concentration more than 100 ppm. Phosphate uptake of the algal cells, however, decreased even though lower concentration of GA is applied. Thereforem it is inferred that the growth enhancement of the algae by GA is not due to the increase of the permeability of the algal cells but expansion growth owing to the increase of osmotic pressure caused by the increase of hydrolase activity of the algae.

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Mesh size and Water Velocity for The growth of Filamentous Periphytic Algae (수질 정화를 위한 부착조류의 성장에 적합한 매질과 유속)

  • Park, Ku-Sung;Kim, Ho-Sub;Choi, Kwang-Hyun;Yoon, Chun-Gyeong;Hwang, Soon-Jin;Gong, Dong-Soo
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2001.10a
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    • pp.435-440
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    • 2001
  • The purpose of this study was to evaluate mesh size and water velocity for the growth of filamentous periphytic algae(FPA). The growth experiment was carried out in the constructed pilot waterway system with nutrient-rich treated wastewater. Growth rate of FPA was highest at water velocity about 10 cm/s. The maximum standing crop of FPA was $253\;{\mu}g\;chl.a/cm^{3}$, and an average of the net productivity was $3.92\;mgDW/cm^{2}/day\;or\;25.3\;{\mu}g\;chl.a/cm^{2}/day$. Biomass development and growth rates of FPA were highest at the net with 20mm mesh size during the fall season and 10mm mesh size during the winter season.

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Numerical Simulation of Growth/Decay of Algae using Equivalent Tracking Method of Decay Coefficient (감쇠계수 등가추적법을 이용한 조류 생장/소멸 수치모의)

  • Park, Inhwan;Kim, Sung Hoon;Song, Chang Geun
    • Journal of the Korean Society of Safety
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    • v.33 no.4
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    • pp.78-83
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    • 2018
  • Previous researches on the analysis of algae concentration were restricted to applying single-valued decay coefficient during simulation period, and the accuracy as well as the applicability were severely challenged. In this study, an equivalent tracking method of decay coefficient was proposed by introducing the time-series decay coefficients and restart option. Dye module in EFDC model was employed to route the temporal variation of Chl-a concentration. It was shown that the simulation results can be significantly improved up to 46% when the equivalent tracking method was activated.

Comparison of Models to Describe Growth of Green Algae Chlorella vulgaris for Nutrient Removal from Piggery Wastewater (양돈폐수의 영양염류 제거를 위한 녹조류 Chlorella vulgaris 성장 모형의 비교)

  • Lim, Byung-Ran;Jutidamrongphan, Warangkana;Park, Ki-Young
    • Journal of The Korean Society of Agricultural Engineers
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    • v.52 no.6
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    • pp.19-26
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    • 2010
  • Batch experiments were conducted to investigate growth and nutrient removal performance of microalgae Chlorella vulgaris by using piggery wastewater in different concentration of pollutants and the common growth models (logistic, Gompertz and Richards) were applied to compare microalgal growth parameters. Removal of nitrogen (N) and phosphorus (P) by Chlorella vulgaris showed correlation with biomass increase, implying nutrient uptake coupled with microalgae growth. The higher the levels of suspended solids (SS), COD and ammonia nitrogen were in the wastewater, the worse growth of Chlorella vulgaris was observed, showing the occurrence of growth inhibition in higher concentration of those pollutants. The growth parameters were estimated by non-linear regression of three growth curves for comparative analyses. Determination of growth parameters were more accurate with population as a variable than the logarithm of population in terms of R square. Richards model represented better fit comparing with logistic and Gompertz model. However, Richards model showed some complexity and sensitivity in calculation. In the cases tested, both logistic and Gompertz equation were proper to describe the growth of microalgae on piggery wastewater as well as easy to application.

Development of Red-Tide Prediction Technique Using Quartz Crystal Oscillator (수정진동자를 이용한 적조예측 방법의 개발)

  • Kim, Byoung-Chul;Kim, Young-Han;Chang, Sang-Mok
    • Journal of Navigation and Port Research
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    • v.28 no.6
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    • pp.573-578
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    • 2004
  • The most important effects on algae multiplication are coming from maintaining the growth environment such as necessary nutrients and proper temperature, but it is difficult to adjust for every species individually. In this study, therefore, the environment is obtained using the local water where target organisms live, and their growth is promoted by raising the water temperature. A sensor to count the organism population is developed here. Because the early stage of a sudden increase of the algae population is detected using the sensor, it is available to predict the sudden increase of algae, a source of red tide.

Process Development of Algae Culture for Livestock Wastewater Treatment Using Fiber-Optic Photobioreactor (축산폐수 처리를 위한 광섬유 생물반응기를 이용한 조류 배양 공정 개발)

  • 최정우;김영기;류재홍;이우창;이원홍;한징택
    • KSBB Journal
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    • v.15 no.1
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    • pp.14-21
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    • 2000
  • In this study, algae cultivation using the photobioreactor has been applied to remove the nitrogen and phosphorus compounds in the wastewater of the livestock industry. The optimal ratio of nitrate and ortho-phosphate concentration was found for the enhancement of removal efficiency. To achieve the high density culture of algae, the photobioreactor consisted of optical fibers wes developed to get the sufficient light intensity. The light could be illuminated uniformly from light source to the entire reactor by the optical fibers. The structured kinetic model was proposed to describe the growth rate, consumption rate of nitrates and ortho-phosphates in algae culture. The self-organizing fuzzy logic controller incorporated with genetic algorithm was constructed to control the semi-continuous wastewater treatment system. The proposed fuzzy logic controller was applied to maintain the nitrated concentration at the given set-point with the control of wastewater feeding rate. The experimental results showed that the self-organizing fuzzy logic controller could keep the nitrate concentration and enhance algae growth.

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