• Korean Journal of Fisheries and Aquatic Sciences
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• v.55 no.5
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• pp.714-720
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• 2022

A dietary comparison of yellow goosefish Lophius litulon in the South Sea and Yellow Sea was performed by analyzing stomach contents. Using a bottom trawl net from fisheries resources survey vessels of the National Institute of Fisheries Science, 326 individuals were collected from the South Sea and 166 individuals were collected from the Yellow Sea. The total length range of L. litulon was 5.3-68.4 cm for individuals collected from the South Sea and 7.5-55.1 cm for individuals collected from the Yellow Sea. Based on the index of relative importance and the variation in stomach contents by fish size, L. litulon was found to be a piscevore and a spatiotemporally opportunistic feeder fish that fed mainly on pisces. There were differences in the composition of the stomach contents by season, location, and the interaction between the season and the location. Thus, the diet of L. litulon is affected by the prey abundance and prey spectrum of the habitat.

• The Korean Journal of Soil Zoology
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• v.2 no.2
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• pp.98-103
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• 1997

This study was investigated, from October to November, 1995, how environmental factors affected both the diversity and the ecology of soil microarthropods according to the sampling sites at althletic training park located in Chonju, Chonbuk. The results obtained are as follow: At the sampling areas, the soil microarthropods were identified into 6 classes, 15 orders, 17,145 individuals. Arachnida showed the highest individual rate (74.10%) in soil mictoarthropods and Acari occupied the great majority (97.98%) in Archinida. Collembola showed the highest individual rate (82.01%) in Insecta. Species planted at althletic training park were 10 famillies 12 genera 20 species 2 varietas 1 forma. In environmental factors which have an effect on the distribution of the soil microarthropods, acarina showed positive correlation for rate of carbon/nitrogen, soil moisture, soil acidity, and lead(Pb) and also negative correlation for solidity and intensity of lightness. Collembola and other animals showed negative correlation for solidity.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2021.04a
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• pp.10-10
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• 2021

Natural products have been used as drugs and cosmetics due to their bioactivity and their biochemical diversity. Natural products usually refer to secondary metabolites produced by various living organisms including marine animals, insects, microbes, amphibians, and plants. These secondary metabolites, which usually have molecular weights less than 2,000 amu, are unnecessary for survival, development, growth, and reproduction but play major roles in plant defense systems against other species. These secondary metabolites such as lignans, flavonoids, monoterpenes, and phenylethanoid glycosides showed various biological activities like anti-oxidant behavior, anti-cancer properties, neuroprotective properties, and so forth. Thus, isolation and elucidation of secondary metabolites from living organisms is of great significance to human life.

• Journal of agriculture & life science
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• v.45 no.4
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• pp.23-28
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• 2011

This study was carried out to provide the basic information for variety improvement by means of nut characteristics of chestnut variety cultivated in Suncheon area. While Tsukuba has the largest number of burr with 125.5, it showed significant difference among chestnut variety. Average number of nuts per burr ranged from 1.3 in Kunumi to 2.4 in Pyeonggi, which showed significant difference among chestnut variety. Average nut weight varied between 17.5 g in Isseumo to 28.1 g in Kunumi. Nut yield ranged form 1,000.4 g in Sangrim to 5,479.5 g in Tsukuba, which showed significant difference among chestnut variety. Changbanggamyul had the highest rate of healthy nut, Kunumi, Tanzawa, Tsukuba, Daebo, Pyeonggi, and Sinyipyeong had the rate of healthy nut more than 80%. The rate of split pericarp showed significant difference among chestnut variety as ranged from 0.0% in Changbanggamyul to 26.1% in Gwangdeok.

• Journal of Marine Life Science
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• v.8 no.2
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• pp.136-149
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• 2023

Basic bioactivities (antioxidant, anti-inflammatory, antibacterial, anticancer, antiviral) were investigated from 370 strains of marine bacteria, fungi, and microalgae obtained from various marine environmental regions in Korea, and the activity results were obtained at the collection site, isolation source, and species level was compared. In the case of marine bacteria, strains belonging to the generally useful genera Streptomyces and Bacillus were observed to have particularly strong efficacy and useful resources were mainly isolated from marine sediments. In the case of marine fungi and microalgae, results showing strong species-specific activity were confirmed, and results showing efficacy-specific activity were also obtained. Based on these results, it is a research result that can facilitate priority access as a strategic material for industrial revitalization and the establishment of a strategy to secure resources based on usefulness when conducting research on chemicals that are selectively effective against specific diseases or when conducting resource-based research. In addition, we believe that by using these results as material for sale through the Marine BioBank (MBB), academia and industry can use them to help accelerate the revitalization of the marine bio industry.

• Korea Information Processing Society Review
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• v.15 no.2
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• pp.105-112
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• 2008

신약 개발의 효율상의 한계를 적극적으로 극복하기 위해서는, 인간 생명 현상에 관계되는 전체 유전자 정보와 이에 수반되는 단백질, 화합물정보들을 그 의미론 정보와 동시에 전산화하고, 전산 모사와 계산 작업을 통해 정보를 역으로 재 가공하는 작업이 필요하다. 또한 재사용성이 높은 대량의 전산 자원이 필요하며, 응용상의 실제연구에 직결되는 유연하고 편리한 사용자 환경이 필수적이다. 따라서 본 연구에서는 생명과학과 화학 정보를 대량으로 관리하기 위한 정보 체계와 전산 자원 관리 및 작업 수행을 그리드 컴퓨팅 환경에서 진행하였으며, 이를 통해 e-Science 포탈의 구축과 함께 현장 서비스를 통해 현실적으로 생명 연구의 혁신을 도모할 수 있는 결과를 제공할 수 있다.

• Research in Plant Disease
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• v.29 no.4
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• pp.433-439
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• 2023

Bacterial leaf blight in carrot is one of the most important diseases in the worldwide. In the past decade, its introduction into Korea is causing great concern due to the potential damage to carrot crops domestically. This bacterial disease is caused by Xanthomonas hortorum pv. carotae (Xhc). This study aimed to isolate and identify bacterial strains from the soil of carrot farms in Jeju Island. The bacterial isolates showing characteristics similar with those of Xhc were selected when cultured on artificial media. Through DNA sequencing and analysis based on NCBI data, some of the selected bacterial strains were identified as Xhc. Furthermore, the bacterial strains caused the typical symptom of bacterial leaf blight after inoculation on carrot leaves. The results of this study showed the potential establishment of Xhc in the soil of Jeju Island and it may be valuable data for establish a strategy preventing the domestic spread of carrot bacterial leaf blight in the future.

• Journal of Life Science
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• v.29 no.2
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• pp.272-278
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• 2019

The silkworm performs sexual reproduction for the production of its healthy offsprings from generations to generations. Parthenogenesis in the silkworm, Bombyx mori acquires immense use in the development of outstanding homozygouse lines with higher viability, hybrid vigour, combining ability and less phenotypic variability, and it can serve as a powerful tool in controlling sex of the offsprings as well as a useful tool in selection of breeding schemes. However, naturally occuring parthenogenesis in silkworm could not be found so far. Fortunately, artificial induction of parthenogenesis is possible in silkworm. So, it is very important to find out novel methods for induction of parthenogenesis. We investigated to attempt to get a novel parthenogenetic method. Accordingly, parthenogenetic studies on between unfertilized in vivo ovarian eggs of live silkworm moth(novel) and unfertilized in vitro ovarian eggs(conventional) taken out from live silkworm moth were investigated by hot water ($46^{\circ}C$), hot air ($46^{\circ}C$) and low temperature ($0^{\circ}C$ and $-20^{\circ}C$) treatments. The best ratio of parthenogenetic eggs was obtained with in vivo ovarian eggs of live silkworm moth rather than with in vitro ovarian eggs taken out from live silkworm moth in all the treatments. The optimum exposure time absolutely depended upon the temperatures of treatments and the forms of in vivo or in vitro ovarian eggs. From these results, we expect that in vivo artificial parthenogenetic treatments on live silkworm moth will be useful for the higher induction of parthenogenesis in the silkworm, B. mori.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.55 no.2
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• pp.224-228
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• 2022

The feeding habits of the Pacific herring Clupea pallasii were examined based on 333 specimens collected from the coastal waters of the East Sea of Korea. Sampling was conducted in April, June, and September 2019 and February 2020. The total length of the C. pallasii ranged from 11.9 cm to 37.7 cm. Euphausiids (93.0%, index of relative importance, IRI), especially Euphausia, comprised the primary diet of the pacific herring, in addition to amphipods, copepods, and fishes. The dietary composition of C. pallasii showed non-significant differences by size. As body size of C. pallasii increased, the mean number of preys per stomach (mN/ST) and the mean weight of preys per stomach (mW/ST) tended to increase.

• ANNALS OF ANIMAL RESOURCE SCIENCES
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• v.30 no.3
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• pp.111-120
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• 2019

The objective of this study was to investigate the effect of different feed inoculation method on rumen fermentation in an in vitro. Three experimental treatments were used: control (CON, direct dispersion of feed (2 g) in rumen fluid), combinations of direct dispersion (1 g) and nylon bag (DNB, pore size: 50 ㎛, 1 g), and nylon bag (NB, 2 g). An in vitro fermentation experiment was carried out using strained rumen fluid for 48 h incubation time and timothy was used as a substrate. At the end of the incubation, in vitro dry matter digestibility (IVDMD), in vitro neutral detergent fiber digestibility (IVNDFD), pH, volatile fatty acids (VFA), ammonia nitrogen (NH₃-N), and microbial community were evaluated and gas production was estimated at 3, 6, 12, 24, 48 h incubation periods. Gas production was higher in CON than DNB and NB at 6 and 12 h incubation time (p<0.01). There were no differences in final gas production, pH, NH₃-N concentration, total VFA production, and VFA profiles among treatments. The IVDMD was lowest in CON (p<0.01) but the IVNDFD was not differed by feed distribution methods. There were no significant differences in general bacteria and fungi. Protozoa count was highest in NB treatment among treatments (p<0.01). The abundance of cellulolytic bacteria, Ruminococcus flavefaciens and Fibrobacter succinogenes, was highest in the CON among treatments (p<0.01).