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Visual system of Korean Salamander(Hynobius leechi) was morphologically studied. Fertilized eggs in egg sacs were collected and were developed in sterile saline solution. Various sized larvae of 5-30mm in length were fixed. Specimens were paraffin sectioned and were observed under light microscope. In 5mm length larva, lens rudiment induced by optic cup was combined with sensory ectoderm. The shape of lens was changed as spherical in 12mm length larva, but the retinal layer did not differentiated into three layers. The differentiation of retinal layer was clear in 14-16mm length larva. The central region of lens fibers was degenerated. Iris and ciliary body were formed from the marginal zone of optic cup in 20mm length larva. Choroid was thicker in elder eye of 30mm length larva and cartilage developed at outer region of optic cup. The outer segment of photoreceptor cell layer grew longitudinally. Optic newe was corulected to the ventral part of brain through cartilage
본 연구에서는 최근 섬진강 하구역 습지에서 쇄방사늑조개의 대량발생 원인 파악을 위하여 개체의 특성 및 수질환경을 알아보았다. 채집된 개체의 각장은 11.82 ~ 20.93 mm, 각고는 7.75 ~ 13.15 mm, 각폭은 4.60 ~ 8.70 mm의 범위였다. 수질환경요인 중 수온, pH, DO는 2016년과 2017년의 월별 패턴의 변화양상이 유사하나 쇄방사늑조개가 대량 발생한 2017년에는 염분농도가 높았다. 염분농도의 변화는 강수량과 서로 유의한 상관성을 보였는데 이는 강수량이 염분농도의 변화에 영향을 주기 때문이다. 이를 통해 염분농도의 변화가 쇄방사늑조개의 대량발생에 있어서 주요 요인으로 작용했을 것으로 판단된다. In this study, water environment and individuals characteristics of Seomjin river estuary wetland were examined to find out the cause of bloom of Potamocorbula amurensis in the area. Collected individuals show 11.82 ~ 20.93 mm shell length, 7.75 ~ 13.15 mm shell height, and 4.60 ~ 8.70 mm shell width. Among the water environmental factors, water temperature, pH, and DO have similar change aspects in 2016 to 2017. However, salinity of Seomjin river estuary was higher in 2017 than it was in 2016. This phenomenon could be explained by the fact that precipitation affects on salinity of water. Therefore, it is determined that the changes of salinity is the main factor of bloom of Potamocorbula amurensis,
The distribution characteristics of functional feeding groups and biological evaluation of water quality with benthic macroinvertebrates were investigated from 2013 to 2014 in the mountain streams of Jirisan National Park. Both quantitative and qualitative collection had been performed six times during study periods in twelve sites located at upstream, midstream and downstream of four valleys, Chilsungol, Baemsagol, Daesunggol and Piagol of freshwater ecosystem in Jirisan National Park. As results, the total collected benthic macroinvertebrates were 3 phyla, 4 classes, 11 orders, 37 families, 107 species and 4,028 individuals. In 2013, 3 phyla, 4 classes, 10 orders, 32 families, 89 species and 1,829 individuals were collected. And in 2014, 3 phyla, 4 classes, 9 orders, 31 families, 80 species and 2,199 individuals were identified. The total dominant species was Ecdyonurus kibumensis, and EPT groups occupied 80.39% of total species number. Biotic indices were also compared to site and to season. The dominant index (DI) was highest at the downstream of Baemsagol in the spring of 2013, and the evenness index (J``) was highest at the downstream of Daesunggol in the summer of 2013. Both diversity index (H``) and richness index (RI) were highest at the upstream of Baemsagol in the summer of 2014. The correlation between altitude above sea level and functional feeding groups of benthic macroinvertebrates was also researched in this study. As a result, the species number of shredders and predators have significantly increased according to the increase of the altitude of their habitat. On the other hand, individuals of gathering collectors have increased according to the increase of altitude. The biological water quality was evaluated and compared with several methods in this study, and we suggest that ESB and GPI are more appropriate than KSI and BMI to evaluate biological water quality of mountain stream water.
Corythucha marmorata Uhler was newly recorded in Korea as a invasive species at Pohang-si, Gyeongsangbuk-do, Korea in 2011 and at Changwon-si, Gyeongsangnam-do, Korea in 2012. Adults of this species show reticular forewings with a lot of transparent membranes and also show pterigoid process of paranotum with strong processes. This invasive species was originated from North America, and then intruded into Europe and Japan. This species is presumed became an epidemic horticultural pest at present and it is injuring almost of Asteraceae leaves. It was presumed that the invasion of Corythucha marmorata into Korea was prior to September of 2011.
물수세미속(개미탑과) 1분류군을 국내 미기록종으로 보고한다. 이 분류군은 지금까지 일본에만 분포하는 것으로 알려졌던 Myriophyllum oguraense Miki로서, 근연종인 물수세미(M. verticillatum L.)와 같이 공기중에서 발달된 잎이 빗살모양으로 갈라져 있으나 물 속에 잠겨있는 잎의 크기가 훨씬 작다. 무엇보다 동아가 곤봉 모양으로 발달하는 물수세미에 비해 얇고 가느다란 선모양의 동아를 지님으로서 뚜렷이 구분된다. 새로운 국명 역시 이러한 동아의 특징을 고려해 ‘긴동아물수세미'로 신칭하였다. 한국산 물수세미속 분류군의 검색키와 더불어 긴동아물수세미에 대한 생육지사진, 형태적 특징, 기준표본 정보, 국내 분포현황 및 관찰표본 목록을 제시하였다. Here we report a previously unrecorded species of Korean Myriophyllum L. (Haloragaceae). This taxon, M. oguraense Miki has been regarded as a Japanese endemic for some 60 years. Myriophyllum oguraense and its closely related M. verticillatum L. share the characteristic of having pectinate emergent leaves that are similar in shape to, but much smaller than, the submerged leaves. However, the primary characteristic that differentiates these taxa is the turion shape (club shaped in M. verticillatum and linear in M. oguraense). The common name, ‘Gin-dong-a-mul-su-sae-mi' was also newly given considering its characteristic turion shape. Photographs and a key to Korean Myriophyllum species are provided in addition to complete descriptions including information on nomenclatural types, distributions and specimens examined.