• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2006.11a
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• pp.173-176
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• 2006

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.10a
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• pp.937-938
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• 2012

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1501-1502
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• 2011

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2015.10a
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• pp.203-204
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• 2015

• Journal of Life Science
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• v.28 no.3
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• pp.345-350
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• 2018

This study examines the role of six species of microalgae, including Phaeodacylum tricrnutum (PT), Chaetoceros gracilis (CG), Nanochloris oculata (NO), Pavlova lutheri (PL), Chlorella ellipsoidae (CE), and Scendedemus obliquus (SO), on hair loss prevention and scalp improvement. To determine the effects of microalgae extracts on hair loss prevention and scalp improvement, antioxidant activity, cell proliferation in HaCaT cells and HFDPC cells, and the inhibition level of 5-alpha reductase activity were examined. In the study of antioxidant activity, the $EC_{50}$ values of DPPH anti-radical activities indicated that the SO, CG, and ST9 treatment groups demonstrate significant antioxidant activity. In the study of the hydroxyl radical scavenging activity, CG (6.6~42.1%), ST9 (26.0~44.0%), and SO (7.8~44.3%) demonstrated significant effects. Furthermore, SO promoted the proliferation of HaCaT cells and a human epidermal cell line during a 6-day treatment. In the study of the proliferation of HFDPC cells, a hair follicle dermal papilla cell line, CG, and SO significantly stimulated cell proliferation. Finally, PT, CG, and SO significantly inhibited 5-alpha reductase activity. These results suggest that among the six microalgae used in this study, CG and SO have antioxidant effects, induce cell proliferation, inhibit 5-alpha reductase activity, and can be used for hair loss prevention and scalp improvement.

• Microbiology and Biotechnology Letters
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• v.44 no.3
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• pp.400-407
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• 2016

A unicellular green alga, Chlorella vulgaris KNUA027, was isolated from the roots of Panax ginseng seedlings and its biotechnological potential was investigated. The results of GC/MS analysis showed that C. vulgaris KNUA027 was rich in nutritionally important polyunsaturated fatty acids (PUFAs) such as alpha-linolenic acid (C_18:3 ω3, 45.8%, 50.8 mg/g) and hexadecatrienoic acid (C_16:3 ω3, 11.8%, 13.1 mg/g). Therefore, this Korean indigenous microalga may have potential as a source of omega-3 PUFAs. It was also found that the saturated palmitic acid (C_16:0, 37.1%, 41.2 mg/g), which is suitable for biodiesel production, was one of the major fatty acids produced by strain KNUA027. The proximate analysis showed that the volatile matter content was 88.5%, and the ultimate analysis indicated that the higher heating value was 19.8 MJ/kg. Therefore, the results from this research with C. vulgaris KNUA027 may provide the basis for the production of microalgae-based biofuels and biomass feedstock.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2004.05a
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• pp.245-248
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• 2004

다대포 갯벌의 YP는 0.06~0.13 mg/L이었고 진우도의 TP는 0.06~0.11 mg/L로 조사시기별로는 두 조사지역간 차이는 없었고 TN은 다대포의 경우 1.44~2.87 mg/L, 진우도는 0.15~1.09 mg/L로 조사되어 매 조사시기마다 진우도보다는 다대포에서 월등히 높았으며 두 지역 모두 해역의 어염등급에 비추어볼 때 상당히 오염이 진행된 상태였다. 조사된 미세조류는 Navicula, Nitzschia, Cyclotella, Cymbella, Synedra 등 13속 26종류로 호청수성 조은 Achnanthes convergence 등 1속 2종류, 호오염성 종은 Nitzschia palea 등 5속 8종류, 광적응성 종은 Cymbella minuta 등 3속 5종류였으며 매 시기마다 우점을 보인 종은 Nitzschia, Navicula 였다. DAIpo 지수는 다대포의 경우, 평균 31.1 진우도는 평균 48.4로 조사되어 비교적 낮은 DAIpo 값을 보였지만 계절별로는 다대포와 진우도의 경우 모두 봄인 5월에 가장 높은 DAIpo 값으로 비슷한 경향을 보였으나 다대포의 경우에서는 매 계절마다 진우도보다 더 DAIpo값이 낮게 조사되었다. DAIpo 값으로부터 갯벌의 오염도를 판정하면 다대포는 $\alpha$-중부수성, 진우도는 $\beta$-중부수성에 해당하여 다대포의 경우가 진우도보다 더 오염이 심한 것으로 조사되었다.

• The Korean Journal of Mycology
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• v.33 no.2
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• pp.86-88
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• 2005

Antifungal activity of the extracts of plants and marine microalgae against Magnaporthe grisea was investigated. Acetone extracts of promegranate rind, leek seed, and maize husk demonstrated high antifungal activity against M. grisea. MIC (minimum inhibitory concentration) of acetone extracts of promegranate rind, leek seed, and maize husk was 100 ng/ml, $50\;{\mu}g/ml,\;and\;100\;{\mu}g/ml$ respectively. Ethanol extract of Amphiprora gigantea showed antifungal activity against M. grisea with MIC of $100\;{\mu}g/ml$.

• Journal of the Korean Society for Precision Engineering
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• v.28 no.2
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• pp.125-132
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• 2011

This paper describes current status and future prospects of the mass production of microalgae biomass. Microalgae have attracted considerable attention since they not only effectively fix $CO_2$ gas during their metabolic process but also have the great potential to be utilized for producing valuable substances as a kind of efficient light-harvesting cell factories. In this review, we outline various types of photobioreactors employed for mass production of biomass by culturing microalgae in a well controlled way and give an overview about the present state of affairs, both domestic and international, in the field of the microalgal culturing technologies.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.19 no.2
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• pp.111-118
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• 2020

Recently, bioenergy research using microalgae, one of the most promising biofuel sources, has attracted much attention. Cell disruption, which can be classified as physical or chemical, is essential to extract functional ingredients from microalgae. In this study, we investigated the cell disruption efficiency of Chlorella sp. using low-frequency non-focused ultrasound (LFNFU). This is a continuously physical method that is superior to chemical methods with respect to environmental friendliness and low processing cost. A flat panel photobioreactor was employed to cultivate Chlorella sp. and its growth curve was fitted both with Logistic and Gompertz models. The temporal change in cell reduction by cell disruption using LFNFU was fitted with a Logistic model. The experimental conditions that were investigated were the initial concentration of microalgal cells, relative amplitude of output ultrasound waves, processing volume of microalgal cells, and initial pH value. The optimal conditions for the most efficient cell disruption were determined through the various tests.