• Title/Summary/Keyword: Inhabit

Search Result 260, Processing Time 0.025 seconds

Antifungal Activity of Bacterial Strains isolated from Tidal Mudflat and Salted Seafood (traditional Jeotgal) Against Six Major Plant Pathogens (갯벌 및 젓갈에서 분리한 세균의 작물 주요 병원균에 대한 항균활성 효과 검정)

  • Kim, Tack-Soo;Lee, Ga-Hyung;Kim, Gyun-Jang;Lee, Se-Won;Park, Kyung-Seok;Park, Jin-Woo
    • The Korean Journal of Pesticide Science
    • /
    • v.14 no.4
    • /
    • pp.421-426
    • /
    • 2010
  • Many bacterial strains inhabit strong saline condition, such as tidal mudflat and salted seafoods, were identified and reported for the proposed protease activities and salt resistance; however antifungal activities against plant fungal pathogen have not well been studied until now. In this study, primary screening was performed for the isolation of promising strains against major plant pathogens like Sclerotinia sclerotiorum, Fusarium oxysporum, Phytophthora capsici, Botrytis cineria, Collectotrichum acutatum and Pythium ultimum. Totally 423 bacterial strain were isolated from laboratory media which was based on different morphological characteristics and all the strains were dual cultured against major fungal pathogens on PDA, finally 40 strains were selected as antifungal bacterial strain and identified by fatty acid phylogenic difference analysis from MIDI shorlock gas chromatography system. As a result, antifungal strains from tidal mudflat were 10 species of 6 genus. Paenibacillus macerans was dominant species; 5 strains among the 17 isolates from tidal mudflat. Antifungal strains from salted seafoods were 7 species of 3 genus and Bacillus atrophaeus was dominant species; 12 strains among the 23 isolates from salted fishes.

The Problems of Dokdo's Development Policy and an Alternative for Future Development (정부의 독도개발정책 문제점과 미래대안 모색)

  • Lee, Jaeha
    • Journal of the Korean association of regional geographers
    • /
    • v.19 no.2
    • /
    • pp.282-300
    • /
    • 2013
  • This study regards that a cause of intensifying sovereignty disputes between Korea and Japan over the Dokdo island has resulted from the fallacy of Dokdo's development policy directly related to exertion and consolidation of Korean government's sovereignty on Dokdo, which has been under Korea's effective control since 1953. From this internal view, this study critically reviews the Korean government's development policy for Dokdo from the 1950s to the end of July 2012 and suggests an ideal alternative for future development of Dokdo on the basis of the discussion of the problems of Dokdo's development policy and its different future development directions proposed in Korean society. The Korean government implemented quite passively the development policy for the inhabited island which is required for the consolidation of sovereignty over Dokdo not to hinder the friendly diplomatic relationship between Korea and Japan. Dokdo is currently not acknowledged as the Korea's Dokdo island in international society, but mostly called Liancourt Rocks. It may be due to the fact that Korea did not positively develop Dokdo as a valuable island which a number of Koreans can inhabit. Consequently this paper proposes 'Dokdo eco-village' as an alternative development plan from the perspective of sustainable development which the UN has adopted. It is a small scale village that contains economic function of eco-friendly fishing, eco-tourism and East Sea research. The hope is that Dokdo eco-village draft plan will be a clue to the discussion and establishment of new Dokdo's development policy to strengthen the Korea's sovereignty and effective control over Dokdo in the future.

  • PDF

Distribution and Status of the Big and Old Trees as Plant Genetic Resources in Ansung City (경기도 안성지역의 노거수 식물유전자원 분포 및 실태)

  • 안영희;최광율
    • Korean Journal of Plant Resources
    • /
    • v.16 no.2
    • /
    • pp.99-108
    • /
    • 2003
  • This study was carried out to make a standard criteria for protection and maintenance of the big and old trees in Ansung city, Kyonggi Prvince. There have been found 6 vegetative species cultivated in this area, which are Zelkova serrata, Gingko biloba, Kalopanax pictus, Pyrus ussuriensis var. macrostipes, Pyrus ussuriensis var. acidula, Pinus densiflora, etc. The Zelkova serrata tree is the major species among them and about 73.5% in the population of the big and old trees in this area. The DBH (diameter at brest height) of them is 1.5-1.9m in 29.4% of whole population and the tree height is 10-l4m in 47.1%. The estimate age of 7 trees is more than 500 years old and they were 20.6% of the whole population. Interesting point is that about 64.7% of these trees in this area have own succeed story in terms of folk religion, object of worship, taboo, legend or secret. This study has also revealed that many fowls, small animals and epiphyte inhabited with the big and old trees have been found. However, 97.1% of them are in danger from the plant disease and noxious insects or cutting damage of branches, but no management has been taken. More over, 85.3% of the whole investigated big and old trees have been in the poor condition for percolation or aeration because the area around them has been payed with asphalt or concrete.

Distribution and Ecology of a Land-Locked Ayu, Plecoglossusaltivelis (Pisces: Osmeridae) in Lake Okjeong, Korea (옥정호 육봉형 은어 Plecoglossus altivelis (Pisces: Osmeridae)의 서식분포와 생태)

  • Ko, Myeong-Hun;Kim, Ik-Soo;Park, Jong-Yeong;Lee, Yong-Joo
    • Korean Journal of Ichthyology
    • /
    • v.19 no.1
    • /
    • pp.24-34
    • /
    • 2007
  • After releasing more than 1,000,000 fertilized eggs of Plecoglossus altivelis into Lake Okjeong, Jeollabuk-do, on October, 2001 by KOWACO, they seem to be land-locked. Study on the distribution and ecology of a land-locked ayu, P. altivelis, was performed from Lake Okjeong to upper streams as Jowon, Churyeong, Oknyedong where consisted of rocky bottom with fast current freshwater system during April to October. The hatched larva and juveniles descended from streams to Lake Okjeong and inhabit Lake Okjeong from November to next March. The sex ratio of female to male was 1 : 2.70, and the size in standard length of females and males was similar, in $90{\sim}220(142{\pm}29.3)mm$. During the middle September to the middle October, they laid eggs on the pebbly bottom of the rapids which are $20{\sim}22^{\circ}C$ in water temperature and 30~70 cm in depth. The number of full-grown eggs was greatly various from 14,283~91,500.

The Environmental Characteristics and Vegetation Structures of Kirengeshoma Koreana Habitats (나도승마 서식지의 환경적 특성과 식생구조)

  • Cho, Seon-Hee;Kim, Dae-Woo;Kang, Sang-Ho;Jeong, Yeo-Hong;Lee, Sung-Jae;Kim, Joon-Sun
    • Journal of Korean Society of Forest Science
    • /
    • v.102 no.3
    • /
    • pp.446-454
    • /
    • 2013
  • The present study investigated the biological agents and environmental conditions of the habitats of the Kirengeshoma koreana, a class 2 endangered species class according to the South Korean Ministry of Environment (MOE), elucidated the structural characteristics of the forest stands in the habitats with the importance value and the diversity index, conducted comparative analysis of the factors, and explored their relationship with environmental factors. According to the results of direction analysis of natural habitats of the Kirengeshoma koreana, the direction was distributed to the north or the northeast, and the slope amounted to $15-40^{\circ}$, thus demonstrating that the slope has little effect. In addition, the results showed that the distribution of Kirengeshoma koreana populations dramatically increased starting in areas at least 600 m above the sea level and that the relative light intensity was 3.79% on an average. Most populations were native to gorges and crevices between rocks so that they mainly tended to inhabit areas that could see soil loss in times of precipitation. In addition, a considerable number of the populations were close to hiking trails as well, thus leading to concerns about their artificial destruction. The soil of layer a in the main growth space of the Kirengeshoma koreana was analyzed and turned out to be strongly acidic, measuring pH 4.45-4.89 (average: 4.68). All investigation sections were typical natural broad-leaved tree areas, and, judging from the fact that the Kirengeshoma koreana was most likely to appear in colonies of the Mongolian oak tree (Quercus mongolica Fisch. ex Ledeb.), the Mongolian oak tree seems to be the species of tree that has the greatest effect on the inhabitation of the Kirengeshoma koreana.

Studies on the Age and Growth fo Sun and Moon Scallop, Amusium japonicum japonicum (GMELIN) (해가리비, Amusium japonicum japonicum (GMELIN)의 연령과 성장에 관한 연구)

  • Son Pal-Won;Ha Dong-Soo;Rho Sum;Chang Dae-Soo
    • Journal of Aquaculture
    • /
    • v.9 no.4
    • /
    • pp.409-417
    • /
    • 1996
  • Age, annual growth pattern, and other ecologically important observations are reporting from the analysis of annual growth annuli of the sun and moon scallop, Amusium japonicum. Field survey made from 1993 to 1994 indicated that the sun and moon scallops are mostly distributed along the southern coast of Cheju-do, especially around the Sogwipo area. They inhabit on muddy sand bottom, at depth between 30 and 40 m where water temperature varies from 14 to $23^{\circ}C$ annually. The gonadal analysis indicated that the spawning mostly occurs during October and December and they exhibit multiple spawning peaks. The formation of annual growth annuli was found to be related with their spawning period. The shell growth on A. japonium japonicum appeared that their shell growth rate is comparatively faster than that of other scallops : 1. japonium japonicum reaches 6.28 cm in shell hight at the first year and 9.07 cm at the second year. The growth rate of gonadal somatic tissue was also found to be faster than growth rates of other scallops. One year old scallops weigh about 18.8 g, two and three year old scallops weigh 60 and 102.4 g. Based upon these observations, it is concluded that A. japonium japonicum can be a valuable species for aquaculture development due to their rapid growth.

  • PDF

PHYSIOLOGIC INTERDENTAL SPACES AND PROXIMAL CARIES IN THE ANTERIOR MAXILLARY PRIMARY DENTITION (상악 유전치부의 치간공간과 인접면 우식에 관한 조사연구)

  • Kim, Jin-Young;Lee, Kwang-Hee;La, Ji-Young;An, So-Youn;Jeong, Seung-Yeol;Im, Kyeong-Uk;Ban, Jae-Hyurk
    • Journal of the korean academy of Pediatric Dentistry
    • /
    • v.36 no.3
    • /
    • pp.387-393
    • /
    • 2009
  • The purpose of this study was to assess the relationship between interdental spaces and proximal caries in maxillary anterior primary teeth. 555 children aged 3-7 inhabit in Iksan were divided into two groups, depending on the presence of interdental space which was detected by a dental explorer. They were determined to have proximal caries if cavity was formed or the enamel surface was softened. The results were as follows : 1. Regarding interdental spaces, 77.4% had primate spaces; 54.4% had developmental spaces between central and lateral incisor, and 39.0% between central incisors. 2. Interproximal caries incidences in right primary canine, lateral incisor, and central incisor were 6.3%, 14.7%, and 33.5%, respectively. Also interproximal caries incidences in left primary central incisor, lateral incisor, and canine were 33.7%, 16.0%, and 4.7%, respectively. 3. Children with more interdental spaces had less caries incidence, but the relationship was weak(r=-0.024). 4. The mean caries incidence was higher in absence of interdental space of maxillary primary incisors than in presence of space. The mean caries incidence with no interdental space was twice as high as that with presence of interdental space.

  • PDF

Habitat Selection and Environmental Characters of Acheilognathus signifer (묵납자루, Acheilognathus signifer의 서식지 선택과 환경특성)

  • Baek, Hyun-Min;Song, Ho-Bok
    • Korean Journal of Ecology and Environment
    • /
    • v.38 no.3 s.113
    • /
    • pp.352-360
    • /
    • 2005
  • Acheilognathus signifer is distributed widely in high density in the Naechon-stream. The order of this-stream was 2 ${\sim}$ 4 and the water width is wide but the depth is relatively shallow and the sinuosity is 1.83, which indicates a meandering stream. The water width/stream width ratio is 1.59, which suggests moderate entrenchment. Naechon-stream was classed as B type by Rosgen (1995). The natural habitat of A. signifer is a slow flow velocity pool, like a backwater pool, which is made up of piled up boulders that restricts the flow of water. The stream bed is made up of boulders and sands that enable the spawning host to inhabit. A. signifer selects a microhabitat where the boulders furnish hiding places. The Habitat of A. signifer is strongly affected by the existence or not there of U. douglasiae sinuolatus. After hatching from the mussel, A. signifer inhabits the surface of the water. It then moves to the low layer once it acquires swimming ability. While A. signifer inhabits the river in summer, A. signifer moves to the deeper layers in winter, where there are the refuge like rocks and boulders. In spring A. signifer moves from the deep water to the river line where the mussels reside.

Fish Community Structure and Inhabiting Status of Endangered Species in Baebong Stream (고성 배봉천의 어류군집과 멸종위기어종의 서식현황)

  • Ko, Myeong-Hun;Moon, Shin-Joo;Bang, In-Chul
    • Korean Journal of Ecology and Environment
    • /
    • v.46 no.2
    • /
    • pp.192-204
    • /
    • 2013
  • Fish community structure and inhabit status of endangered fish species were investigated during April to November 2011 in Baebong Stream, Gangwon do, Korea. The number of fish species inhabiting the upper section (Stations 1~3, 5) was 14 and the stream bottoms were mostly composed of cobbles and boulders (Aa-type). Meanwhile, the number of fish species inhabiting the lower section (Stations 4, 6, 7) was 26 and the stream bottoms were mostly composed of pebbles, cobles and sand (Bb-type). A total of 26 species belonging to ten families were found in the stream during the survey period. The dominant and subdominant species were Rhynchocypris steindachneri (31.1%) and Squalidus multimaculatus (13.3%), respectively, and others such as Pungitius kaibarae (11.0%), Zacco koreanus (7.8%), Misgurnus anguillicaudatus (7.0%), Iksookimia pacifica (5.5%) and Z. platypus (5.3%) were followed in the order. Four species of Squalidus multimaculatus, Z. koreanus, I. pacifica and Liobagrus andersoni were endemic to Korea. And, Lethenteron japonica, L. reissneri, Pungitius sinensis and Cottus hangiongensis were endangered fish species in this stream. Oncorhynchus keta, L. japonica and Tribolodon hakonensis were anadromous species, and Plecoglossus altivelis was an amphidromous species. The similarity index based on species composition and abundance clearly divided the fish community structure of the Baebong Stream into two sections fragmented by a weir installed into the stream. It is necessary to install a fish ways on the weirs for a fish migration and movements.

Species Composition and Biology of Major Species of Gobiid Fish in Cheonsu Bay of the Yellow Sea, Korea (한수만(漢水灣) 망둑어과(Family Gobiidae) 어류(魚類)의 계절(季節)에 따른 종조성(種組成) 변화(變化)와 우점종(優點種)의 생태(生態))

  • Im, Yang-Jae;Lee, Tae-Won
    • Korean Journal of Ichthyology
    • /
    • v.2 no.2
    • /
    • pp.182-202
    • /
    • 1990
  • Gobiid fish were collected monthly in Cheonsu Bay by a beach seine from the shallow water and by an otter trawl from the deep water from September, 1984 to August, 1986. Seasonal variation in species composition and biology of the major species were examined with the data of length and age composition. Fourteen speices of gobies were identified. Gobiid fish were more abundant in the shallow water than in the deep water. In the shallow water, they constituted 66% and 39% of the fish collected in the mud flat and the sand beach, respectively. The suction discs of the gobies explains that they inhabit successfully in the surf zone where the wave action is strong. Of the major species, Chaenogobius mororanus predominated in the shallow mud flat. A large number of adults of this species were obtained in Spring and their juveniles were collected from Summer through Autumn. Favonigobius gymnauchen was abundant in the shallow water, especially in the sand beach. This fish seemed to spawn from May through June, about two months later than Chaenogobius mororanus. Acanthogobius hasta juveniles lived in the shallow water and moved into the deep water as the fish grew. Chaturichthys stigmatias was collected mainly in the deep zone.

  • PDF