• 한국양식학회지
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• 제15권1호
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• pp.1-6
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• 2002

기수재첩 (Corbicula japonica)의 서식환경과 서식밀도를 파악하기 위하여 강원도 양양군 남대천 하구를 대상으로 수질, 퇴적물 환경, 입도분석 및 서식밀도와 크기별 출현율 등을 조사하였다. 재첩 서식지의 수온은 -0.2∼26.8$\^{C}$, 염분은 0.50∼3.21$textperthousand$, 용존산소는 5.21∼8.13 ppm이었으며, 영양염류 중 PO$_{4-}$P은 ND∼1.37 ppm, NO$_{2-}$은 0.10∼0.81 ppm으로 나타났다. 퇴적물의 환경에서 COD는 1.53∼2.82 ppm, 황화물은 ND∼0.0012 ppm, 강열감량 (IL)은 0.85∼1.36%로 안정된 값을 보였다. 퇴적물 조성은 대부분 모래 또는 역질모래였으며, 분급도는 0.53∼1.77 $\phi$로 매우 양호하였다. 재첩의 서식밀도는 2∼464 개체/$m^2$로서 하류 50 개체/$m^2$, 중류 50∼400 개체/$m^2$, 상류 10∼200 개체/$m^2$로 다양하였으며, 크기에 따른 출현율은 각장 10 mm 이하가 3.2%, 10∼20 mm가 50.4%, 20∼30 mm가 43.3% 그리고 30 mm 이상이 3.1%로서 10 mm 이상은 전체의 96.8%로 나타났다.

• Parasites, Hosts and Diseases
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• 제22권1호
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• pp.43-50
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• 1984

이형흡충류의 하나인 Stellantchasmus falcatu에 의한 인체기생 2례가 praziquantel투약후 성충을 수집함으로써 화인되었다. 환자는 서울에 거주하는 24세 (제 1례) 및 55세 (제 2례) 남여로 제 1페는 설사, 복통 등 소화기증상과 불정맥(arrhythmia) 등 심식증상을 호소하면서 대편내에 광절렬류조충란이 양성이었고 제 2례는 소화불량과 조충류 편절 배출을 호소하였다. 조충감염 치료를 위해 praziquantel 15∼20mg/kg를 투여하고 MgSO4 30g으로 충체배출을 유도한 바 배출된 조충을 각각 확인하였다. 그러나 나머지 설사편을 입체해부현미경으로 세밀히 조사한 결과 제 1례에서는 188마리의 S. falcatus와 다른 3종의 이형흡충류가, 제 2례에서는 5마리의 S. falcatus가 수집되었다. 환자들은 숭어(Mugil cephalus) 등 반염수9을 회로 먹었다고 하며 이들이 감염원일 것으로 추측되었다.

• Parasites, Hosts and Diseases
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• 제22권1호
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• pp.37-42
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• 1984

이형흡충류의 하나인 Heterophyes heterophkes nocens에 의한 인체감염 2례가 치료후 충체를 얻세(제1예) 및 24세(제2예) 남자로 전남 고흥군 해안마을이 고향이거나 현재 거주지이며 제1예는 상복부 통증 및 소화불량 등의 증상을, 제2예는 EKG검사상 불정맥 및 ventricular premature be각 등 심장 기능이상과 설사, 복통 등 소화기 증상을 호소하였다. 1983연 4월 및 8월에 bithionol 30mg/kg 또는 prasiquantel 15mg/kg을 투여하고 설사편을 입체해부현미경하에서 검사한 바 각각 35및 67마리의 H. heterophyes noces가 수집되었다. 대편검사 또는 충체검사상 제 1예는 간흡충이, 제2예는 3종의 다른 이형흡충류와 광절렬두조충이 동시 감염되어 있었다. 환자들은 H. heterophyes nocens의 중간숙주인 숭어 (Mugil cephalus), 농어 (Lateolalabrax japonicus) 및 문절망둑(Acanthogobius navimanus) 등 반염수산 어류를 회로 먹은 정력이 있었다.

• Journal of Species Research
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• 제6권2호
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• pp.129-140
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• 2017

During a comprehensive investigation of indigenous prokaryotic species in Korea, a total 31 bacterial strains assigned to the class Alphaproteobacteria were isolated from diverse environmental habitats including freshwater, seawater, brackish water, ginseng soil, plant roots, natural caves, and tidal flats. Based on their high 16S rRNA gene sequence similarities(>99.1%) and formation of robust phylogenetic clades with the closest type species, each strain was assigned to an independent and predefined bacterial species. Because there were no published or official reports regarding the isolation of these 31 species in Korea, this study identified three species in two genera in the order Caulobacterales, 12 species in 10 genera in the order Rhodobacterales, three species in two genera in the order Rhizobiales, two species in two genera in the order Rhodospirillales and 11 species in seven genera, all in the order Sphingomonadaceae within the Alphaproteobacteria are reported as new alphaproteobacterial species in Korea. Gram reaction, colony and cell morphology, basic biochemical characteristics, isolation source, and strain IDs are described in the species description section.

• 한국패류학회지
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• 제21권1호
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• pp.57-64
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• 2005

Samples of Corbicula japonica Prime of Jujin estuary in Gochang were collected from July 2000 to September 2001. Age of C. japonica was determined from the rings on the shell. The relationship between shell length and ring radius in each ring group was expressed as a regression line. Therefore, there is a correspondence in each ring formation. Based on the monthly variation of the marginal index (MI') of the shell, it is assumed that the ring of this species was formed once a year during the period of February and March. The relationship between shell length (SL; mm) and total weight (TW; g) was expressed by the following equation: TW = 1.0942 ${\times}10^{-4}SL^{3.3217}$ ($r^2$ = 0.9905). Shell length (SL) and shell height (SH; mm) was highly correlated with shell height as the following equation: SH = 0.9174 SL - 0.9935 ($r^2$ = 0.9885). The shell length (SL) - shell width (SW) relation was also expressed by the following equation; SW = 0.5925 SL - 1.1706 ($r^2$ = 0.9726). Growth curves for shell length and total weight fitted to the von Bertalanffy's growth curve were expressed as: $$SL_t = 46.4861[1-e^{-0.3383(t+0.0958)}]$$, $$TW_t = 34.54[1-e^{-0.3383(t+0.0958)}]^3.3217$$.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.107-112
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• 2005

Road is built continuously along with development of industry and cut slope is happened necessarily in road construction. Geoengineers are executing cut slope stability analysis considering various cut slope condition such as topography, geology, hydraulic condition and so on. The Tertiary Jungja Basin is located in the southeastern coastal area of the Korea Peninsula. Jungja Basin area is created by geotectonic movement of the plate after Early Miocene epoch. The northwestern and southwestern boundary of the basin is fault zone. The Basement rock is hornfels (Ulsan Formation). Basin-fills consist of extrusive volcanic rock(Tangsa Andesites), unconsolidated fluviatile conglomerate(Kangdong Formation) and shallow brackish-water sandstone(Sinhyun Formation). The characteristics of cut slopes in this area is different with cut slopes in the other site. Soil layers in this area is unconsolidated sediments and is not formed the weathering and erosion of the rock. So, the depth of soil layer is very thick. Faults of this area are northwest-southeast and northeast-southwest direction. Expandible clay mineral as smectite, chlorite et al. detected from fault gouge using XRD. Therefore, Jungja Basin area must consider the characteristics of the faults and soil layers thickness necessarily cut slopes stability analysis.

• Parasites, Hosts and Diseases
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• 제45권3호
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• pp.219-223
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• 2007

A case of Diphyllobothrium latum infection in a 49-year old man is described, and diphyllobothriasis latum in the Republic of Korea is briefly reviewed. An incomplete strobila of a tapeworm, 95 cm in length, without scolex and neck, was spontaneously discharged in the feces of a patient. On the basis of morphologic characteristics of the worm and eggs, the worm was identified as D. latum. The patient was successfully treated with a single dose (15 mg/kg) of praziquantel. The most probable source of infection was salmon flesh according to the past history of the patient. The first case of D. latum infection was documented in 1971, and this is the 43rd recorded case in the Republic of Korea. The 43 cases were briefly reviewed. The patients' main complaints were gastrointestinal troubles, such as mild abdominal pain, indigestion, and diarrhea, and discharge of tapeworm segments in the feces. The suspected infection sources included raw or improperly cooked flesh of fresh or brackish water fish, including the perch, mullet, salmon, and trout.

• Animal cells and systems
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• 제16권5호
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• pp.391-399
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• 2012

We cloned cDNA-encoding arginine vasotocin (AVT) from the brain of the cinnamon clownfish Amphiprion melanopus, and that was predicted to encode a protein of 153 amino acids. We examined changes in the expression of AVT mRNA in the brain and arginine vasotocin receptor (AVTR) mRNA and osmotic stress transcription factor 1 (OSTF1) mRNA in the gills of the cinnamon clownfish using quantitative real-time PCR in an osmotically changing environment (seawater (35 psu) ${\rightarrow}$ brackish water (BW, 17.5 psu) and BW with prolactin [PRL]). The expression of AVT, AVTR, and OSTF1 mRNA in the brain and gills increased after transfer to BW, and the expression was repressed by PRL treatment. AVT-immunoreactive cells were almost consistently observed in the telencephalon. The plasma $Na^+$ and $Cl^-$ levels decreased in BW, but the level of this parameter increased in BW with PRL treatme during salinity change. These results suggest that AVT, AVTR, and OSTF1 play important roles in hormonal regulation in osmoregulation organs, and that PRL improves the hyperosmoregulatory ability of cinnamon clownfish in BW environment.

• 자원환경지질
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• 제9권1호
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• pp.45-73
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• 1976

This study has been made for the enlargement of a previous work of 1964 which was carried out by an author of this work emphasizing the stratigraphy, micropaleontology, depositional environment, and structural tectonics of the studied area. The stratigraphic sequences of the area are groupped into four units: (1) basement of Pre-Cretaceous, (2) lower sediments of Late Cretaceous, (3) upper sediments of Late Cretaceous and (4) igneous rocks of Late Cretaceous and Tertiary (?). The oldest rocks consisting of schists and gneisses of Pre-Cambrian and schistose granite' of Jurassic age are exposed at the base of this area on which the thick Cretaceous sediments were deposited. These old rocks are unconformably overlain by the lower sedimens of Late Cretaceous composed of three members, an alternation of black shale and tuffaceous sediments, fine tuff and rhyollite flow in ascending order. The oily material was found from the black shales of the alternation m"ember as semi-solid greaselike material, oily order and microscopic granular spherical material and oily stain. The lower sediments are also overlain, in low-angleunconfromity, by the 'upper sediments having three members, an alternation of volcanic conglomerate and andesitic tuff, rhyollitic tuff and andesite flow in the same order. The igneous suit of diabase, diorites, biotite granite, porphyritic granite and porphyries of the latest Cretaceous and small exposure of pitchstone of Tertiary (?) intruded into the pre-existed rocks above mentioned. Considerable amount of ostra- coda microfossils have been chemically extracted from the black shales of the lower sediments and the identification of the fossils suggests that the depositional environment of the sediments were under fresh or brackish water condition. The distribution of the geology and its tectonic data also suggest a combination of dome and basin structures in the area of San-i peninsula and Jin-do as shown in fig. 8. Between these two units an anticlinal structure was constructed. As a result of this study, a seismic survey in a district between U-su-yong and north coast of Jin-do is recommended to determine the underground features.

• 한국환경복원기술학회지
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• 제11권3호
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• pp.50-61
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• 2008

Environmental factors and phragmites growth properties at various habitats in Eulsukdo ecological park were investigated to understand major factors affecting phragmites distribution in constructed wetlands. Although phragmites is very important species in wetland ecosystem, it should be controlled to prevent excessive expansion within the restricted park area. The results showed that phragmites dominant sites have the highest LAI among other emerged plants habitats and could adversely affect for waders habitats. Phragmites were also found at the areas with wide ranges of water-depth than other plants, and showed phragmites could be favored for occupying the newly constructed wetlands like Eulsukdo ecological park. The results showed difference in soil redox potential between phragmites dominant and non-dominant sites. Because soil redox potential is affected by wetland hydrology like flooding duration, control of wetland hydrology should be considered for creation and management of constructed wetlands. The results also showed that differences in soil cation exchange capacity, soil salinity, soil organic matter content and site inclination between phragmites dominant and non-dominant sites as well as brackish and freshwater areas. Those abiotic factors can be important considerations for the sustainable wetland management especially for the phragmitest managements in the ecological park.