• Journal of Microbiology and Biotechnology
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• v.28 no.3
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• pp.432-438
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• 2018

Microalgae hold promise as a renewable energy source for the production of biofuel, as they can convert light energy into chemical energy through photosynthesis. However, cost-efficient harvest of microalgae remains a major challenge to commercial-scale algal biofuel production. We first investigated the potential of electrolytic water as a flocculant for harvesting Tetraselmis sp. Alkaline electrolyzed water (AEW) is produced at the cathode through water electrolysis. It contains mineral ions such as $Na^+$, $K^+$, $Ca^{2+}$, and $Mg^{2+}$ that can act as flocculants. The flocculation activity with AEW was evaluated via culture density, AEW concentration, medium pH, settling time, and ionic strength analyses. The flocculation efficiency was 88.7% at 20% AEW (pH 8, 10 min) with a biomass concentration of 2 g/l. The initial biomass concentration and medium pH had significant influences on the flocculation activity of AEW. A viability test of flocculated microalgal cells was conducted using Evans blue stain, and the cells appeared intact. Furthermore, the growth rate of Tetraselmis sp. in recycled flocculation medium was similar to the growth rate in fresh F/2 medium. Our results suggested that AEW flocculation could be a very useful and affordable methodology for fresh biomass harvesting with environmentally friendly easy operation in part of the algal biofuel production process.

• Journal of Fisheries and Marine Sciences Education
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• v.11 no.2
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• pp.115-138
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• 1999

Since the STCW-F convention was adopted, The states concerned, has been investigated in many ways to adopt the prevailing circumstance and condition, accordingly, all preparation will be provided to accept the STCW-F convention to promote the safety of life and prevention of pollution. Prior to enter into force of this convention, we have to investigate the matter of policies, and must have great international concern to the seamen's education. Especially, we should discuss functional skill and knowledge matrix of fishing vessel seamen's education with the supplementary studies, and therefore, we should reflect to the contents, methods of education, inducement of advanced technics, application of education all aids to meet the acceptance of STCW-F convention. Also, we are attempt to implement to accept high quality of fishing vessel seamen's education as the application of simulator and any other advanced devices in future.

• Journal of Environmental Science International
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• v.21 no.7
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• pp.865-873
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• 2012

Clean plate education program was applied to change students' perception on food waste in the dormitory cafeteria of T campus G university that is located in Tongyeong, in which 408 students joined the program. From survey and food waste monitoring, it was found that clean plate education program was effective to change students' perception as well as action. Half students (50.5%) answered that their eating habit changed, and among them 30.1 % students left a little food on the plate and 13.1% students left no food behind. Many students become aware of the seriousness of food waste issue (84.5%), and 44.2% students were trying to reduce leftover. Food waste generation in cafeteria was 341.9, 576.1, 344.3g/capita/day in 2005, 2007 and 2008, respectively. And this shows that food waste generations were much less than national average data except 2007. Therefore we could conclude that clean plate education program was satisfactory to change students' perception on food and to change their action, and it could be an excellent new approach to resolve a social issue caused by food waste. In order to reduce food waste generation at dormitory cafeteria, food taste and diet should be improved and students' eating habits also should be changed. For this, a practical program like clean plate education should be organized.

• Journal of Fisheries and Marine Sciences Education
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• v.27 no.6
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• pp.1602-1609
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• 2015

The purpose of this study is to design of prototype for developing webpage of fisheries and marine education especially in the field of Busan area. For this, we extract the guideline for development from literature review, need and task analysis, and advices of subject domain experts. Followings were the results of the research: (a) We make the prototype for main menu and screen based on institute, time, subject, and location. (b) We make the prototype for program approach guide, which is consisted of location based menu constructing prototype guide, activation prototype guide, and selection prototype guide. (c) We make the prototype for functional guide, which is consisted of information section, participation section and other sections.

• Journal of Fisheries and Marine Sciences Education
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• v.24 no.2
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• pp.286-301
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• 2012

This study was to consider the development strategy of Jeju Marine leisure equipment industry for facilitating marine leisure tourism industry. For achieving this goal, the case studies related to domestic & foreign marine leisure equipment industry, interviews of marine leisure equipment company, the contents of specialist consultation meeting were used in this study. The strategies for promoting were suggested in progress that step 1 was the expansion of maintenance infrastructure as of a port of call, step 2 was the establishing of marie leisure tourism image, step 3 was the integration of marine leisure equipment industry. More specific suggestions were followed. As an aspect of infrastructure, the expansion of management of marine leisure equipment such as yacht, development of marina having similar image of Jeju were suggested. As an aspect of law/institution, the development of financial support system on the marine leisure equipment, promotion of establishment of professional education institutions were suggested. As an aspect of contents/programs, the hosting the exhibition of marine leisure used equipment of international trade, the development of environmental-friendly program associated with cruise were suggested, Finally, as an aspect of promotion/marketing, the promotions linked with drama & movie industry, the strategy of improvement of negative image to the yacht industry were suggested.

• Journal of Marine Bioscience and Biotechnology
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• v.5 no.4
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• pp.1-7
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• 2011

Bone health is maintained by balance between bone resorption and bone formation, and bone homeostasis requires balanced interactions between osteoblasts and osteoclasts. Most of drugs and functional foods for bone health have been developed as bone resorption inhibitors, which maintain bone mass by inhibiting the function of osteoclasts. The recent studies have shown beneficial effects of marine natural products on bone health. Therefore, this review is aimed to study effects of marine-derived natural substances on osteoarthritis inhibition via attenuation of MMPs and osteoblastic differentiation via activation of alkaline phosphatase (ALP), osteoclacin (OC), bone morphogenic protein-2 (BMP-2) as an important factor for bone formation, and mineralization. The present review can provide new insights in the osteoblastic differentiation of marine natural products and possibility for their application in bone health supplement.

• Journal of the Korean Society for Marine Environment & Energy
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• v.11 no.4
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• pp.175-180
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• 2008

The present study is aimed to investigate relation between Marine Environmental Engineering (MEE) and Environmental Education (EE). This study is necessary for mutual advance toward sustainable future between MEE which has the characteristic of the practicality of the present and EE which has that of the ideality of the future. For this, we analyzed the character of MEE by the theoretical frame of 'Environmental Studies for Environmental Education' that was presented recently as a new theoretical viewpoint of EE. This study prepares a base for the two fields to help each other and to develop as we elucidated the environmental educational character which is considered latent in MEE.

• Korean Journal of Ichthyology
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• v.34 no.2
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• pp.113-118
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• 2022

The feeding habits of sandfish, Arctoscopus japonicus were studied using 781 specimens collected by Eastern Sea Danish and gill net from January 2020 to December 2021 in the coastal waters of East Sea, Korea. The size of the specimens ranged from 14.8 to 25.4 cm in total length. A. japonicus were fed mainly on amphipods that constituted 54.7% in IRI. Cephalopods were the second largest prey component. The diets also include small quantities of euphausiids, crabs, shrimps, fishes, and worms. The diet composition of A. japonicus showed changes in season. The cephalopods feeding rate was highest in summer, whereas the proportion of euphausiids was higher in spring than in other seasons. The proportion of cephalopods has increased as the body size of A. japonicus increased, whereas the proportion of amphipods and euphausiids decreased gradually. As the body size of A. japonicus increased the mean weight of prey per the stomach (mW/ST) tended to increase significantly (One-way ANOVA, P<0.05).

• Journal of Fisheries and Marine Sciences Education
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• v.26 no.2
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• pp.421-429
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• 2014

We investigated the feeding ecology of juvenile chum salmon (Oncorhynchus keta) during the critical early life stage prey selectivity of juvenile chum salmon during early marine migration in Korean waters at spring 2011. Salmon juveniles and zooplanktons were collected to draw with $20m{\times}5m$ gill net and $300{\mu}m$ mesh zooplankton net at each station on 11th-13th April n 2011. Collected zooplanktons were classified to 5 Phylum, 6 Class, 9 Order 17 Species in this study. Almost 76.4-100% species were classified to Phylum Arthropoda, dominant species was a species out of Hyperia galba of Order Amphipoda, Acartia spp and Paracalanus parvus of Order Calanoida. Collected salmon juveniles were grew up to average 4.7-5.4 cm fork length and average 1.0-1.5 g wet weight in whole station. Fish stomach content (mg/salmon) was heaver to 97.4, 82.4 and 63.2 mg wet weight/salmon in ST 2, 3, 4 than 20.4, 18.9 mg/salmon of ST 1, 5, because there are fish (sand eel, Hypoptychus dybowskii) and Krill (Euphausia) as prey in salmon stomach in ST 2, 3, 4. And ST 2, 3, 4 and 5 were dominated by Amphipoda as Hyperia galba, Themisto japonica and Gammarus sp., but ST 1 was dominated by copepod, because of absence of Amphipoda in the station. Therefore small Amphipoda as Hyperia galba was good prey for just released salmon juvenile in nature.

• Journal of Microbiology and Biotechnology
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• v.28 no.6
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• pp.931-937
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• 2018

Glycosyltransferases (GTs) from microbes are an emerging and rich source for efficient glycol-transformation of natural/unnatural compounds. Here, we probed the catalytic capability and substrate promiscuity of BmmGT1 from marine-derived Bacillus methylotrophicus B-9987. The regioselectivity of BmmGT1 on macrolactin A (1) was explored by optimization of the reaction conditions, in which a series of O-glycosylated macrolactins (1a-1e) were generated, including two new di/tri-O-glucosyl analogs (1b and 1e). Furthermore, BmmGT1 was able to catalyze the glycosylation of the thiol (S-) or amine (N-) sites of phenolic compounds (2 and 3), leading to the generation of N- (2a) or S-glycosides (3a and 3b). The present study demonstrates that BmmGT1 could serve as a potential enzyme tool for O-, N-, or S-glycosyl structural diversification of compounds for drug discovery.