• Applied Microscopy
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• 제17권1호
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• pp.131-160
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• 1987

Anatomical features of the renal papilla and pelvis and ultrastructures of the epithelium covering these areas in four species of mammals were studied by means of light, scanning and transmission electron microscopy. In terms of the morphology of mammalian kidney types distinguished by Sperber(1944), Pfeiffer(1968) and Schmidt-Nielsen(1977), the kidneys of animal species used in this experiment were; 1) the mouse kidney with the fornix between a long conical papilla and the funnel-shaped pelvis, 2) the guinea pig kidney with the peripelvic column and pelvic pouch between a short conical papilla and the funnel-shaped pelvis, 3) the dog kidney with the peripelvic column and pelvic pouch between the crest-shaped papilla and the funnel-shaped pelvis, and 4) the cattle kidney which is divided into multiple renculi with minor and major calyces and pelvis. The renal papilla was lined with the simple or pseudostratified columnar epithelium which covered the inner zone of the renal medulla. The epithelial cells with numerous short microvilli on the surface contained a few organelles. In the mouse, the fornix was lined with one to two cell-layered cuboidal epithelium which covered the outer zone of the renal medulla and a part of the cortex. The epithelial cells of the fornix with numerous short microvilli or microridges on the surface had well-developed organelles. In the guinea pig, the peripelvic column was lined with the simple cuboidal or low columnar epithelium which covered the outer zone of the renal medulla. The epithelial cells with numerous short microvilli on the surface contained well-developed organelles. The pelvic pouch was lined with the pseudostratified columnar epithelium which was composed of four kinds of cells; the secretory cell with small electron-dense granules (310 nm), the secretory cell with large granules (720 nm) showing various electron densities, the mitochondria-rich cell with a single cilium, and the basal cell. Pelves of the mouse and guinea pig, peripelvic column, pelvic pouch and pelvis of the dog, and minor and major calyces and pelvis of the cattle were lined with the transitional epithelium. The fusiform vesicles in the superficial cells of the epithelium were highly developed in the dog, relatively well developed in the mouse and guinea pig, and poorly developed in the cattle. From the above findings, it is suggested that the transport of solutes and water of the urine in the pelvic cavity can take place through the epithelia covering the renal papilla and fornix of the mouse, papilla and peripelvic column of the guinea pig, and papillae of the dog and the cattle. And specialized cell types in the epithelium of the guinea pig pelvic pouch, two kinds of secretory cells and mitochondria-rich cell with a single cilium, could have peculiar functions in the renal pelvis, respectively.

• 한국물환경학회지
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• 제36권4호
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• pp.284-299
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• 2020

Dam reservoirs play a particularly crucial role in processing the allochthonous and the autochthonous dissolved (DOC) and the particulate (POC) organic carbon and in the budget of global carbon cycle. However, the complex physical and biogeochemical processes make it difficult to capture the temporal and spatial dynamics of the DOC and the POC in reservoirs. The purpose of this study was to simulate the dynamics of the DOC and the POC in Daecheong Reservoir using the 3-D hydrodynamics and water quality model (AEM3D), and to quantify the mass balance through the source and sink fluxes analysis. The AEM3D model was calibrated using field data collected in 2017 and showed reasonable performance in the water temperature and the water quality simulations. The results showed that the allochthonous and autochthonous proportions of the annual total organic carbon (TOC) loads in the reservoir were 55.5% and 44.5%, respectively. In season, the allochthonous loading was the highest (72.7%) in summer, while in autumn, the autochthonous loading was the majority (77.1%) because of the basal metabolism of the phytoplankton. The amount of the DOC discharged to downstream of the dam was similar to the allochthonous load into the reservoir. However, the POC was removed by approximately 96.6% in the reservoir mainly by the sedimentation. The POC sedimentation flux was 36.21 g-C/㎡/yr. In terms of space, the contribution rate of the autochthonous organic carbon loading was high in order of the riverine zone, the transitional zone, and the lacustrine zone. The results of the study provide important information on the TOC management in the watersheds with extensive stagnant water, such as dam reservoirs and weir pools.

• 한국지리정보학회지
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• 제13권3호
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• pp.102-118
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• 2010

야산은 평지와 산지의 점이적인 지역이기 때문에 언제나 개발의 압력을 받고 있는 지역이다. 과거 야산은 산지에 비해 개발이 용이한 지역으로 인식되어 왔지만 이제는 산림 자원으로 인식하고 보전할 필요성도 있다. 현재 개간 현황 및 변화 과정에 대한 연구는 사례를 찾아보기 어렵다. 이에 본 연구에서는 시계열 자료를 활용하여 야산의 토지이용 변화를 정량적으로 파악하고자 하였다. 이를 위해 1915년, 1972년, 2002년, 2006년의 토지이용도를 작성하고 지리정보체계를 기반으로 공간분석을 수행하였다. 연구지역은 충청남도 당진군 면천면, 순성면, 합덕읍과 예산군 봉산면, 고덕면 경계 지역이며 야산의 총 면적은 3,034ha이다. 연구지역 야산의 산림 면적은 1915년~2006년 동안 50% 감소하였다. 2002년 이후 4년 사이의 산림 감소 면적은 그 이전 30년의 감소량과 비슷하다. 연구지역 야산의 산림감소는 논, 밭, 인공구조물, 나지 등 개간지의 증가로 이어졌다. 1915년부터 1980년대 말까지의 야산 개간은 1차 산업과 관련이 있으며, 그 이후의 야산 개간은 농공단지개발 등 2차 산업과 관련이 있다.

• 자원환경지질
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• 제28권6호
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• pp.599-612
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• 1995

Some REE ore deposits are located in the middle part the of Korean peninsula. Geotectonically, the REE ore deposits situated on the Kyemyeongsan Formation of northern margin of the Okcheon geosynclinal belt and in the transitional zone between Kyeonggi massif and the Okcheon belt, with a deep-seated fracture separating the two tectonic units. The Kyemyeongsan Formation are different in lithology and metamorphic grade from the Gyeonggi massif and the Okcheon super group. The sequence of Kyemyeongsan Formation is dominantly composed of acidic metavolcanic and volcaniclastic rocks associated with alkaline igneous rocks which are related to volcano-plutonism. The REE ore deposits contain mainly Ce-La, Ta-Nb, Y, Y-Nd and Nd-Th group minerals. More than 15 RE and REE minerals have been found in the deposits, such as allanite, fergusonite, thorite bestnaesite, euxenite, polyclase, monazite, columbite, (Nb)-rutile, okanoganite, sphene, zircon, illmenite and some other unknown minerals. According to the characteristics of the mineral association, the REE ore deposits may be divided into 4 ore types; Zircon-REE, allanite-REE, feldspar-REE and fluorite-REE type. The Sm-Nd isochron age of the REE ore is 330 Ma, and the Sm-Nd model age is 1.11 Ga with ${\varepsilon}_{Nd(t)}$ being - 2.9. This data suggest that the REE ore deposit was formed in the early Carboniferous, and the ore-forming material came from the mantle. The REE ores show distinct light REE enrichment with strong negative Eu anomaly. The REE patterns of schistose rocks from Kyemyeongsan Formation are similar to felsic volcanics from rifts or back arc basins in or near continental crust. The genesis of the REE ore deposit is quite complicated. Different geologic processes are displayed in the studied area; sedimentation, volcanic activity, metamorphism and hydrothermal replacement. Alkali granite has suffered extensive post-magmatic metasomatism of a high temperature to produce alkali metasomatites. Geochemical charateristics show that metasomatism of alkaline fluid was probably the dominant ore-forming process in Chungju district.

• Journal of Species Research
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• 제6권1호
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• pp.59-67
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• 2017

Southwest Primorye is located in the southern most part of the Russian Far East. The flora of this area is one of the most thoroughly studied and contains 1,530 species of vascular plants, belonging to 622 genera and 154 families, representing 55.6% of the flora of the Primorsky Territory. The flora native to Southwest Primorye encompasses 1,356 species from 547 genera and 148 families. Adventitious plants are represented by 174 species from 127 genera and 37 families. Among other areas of the Russian Far East, only Southwest Primorye has flora in common with the Korean Peninsula, which contains plant species in the subtropical and tropical latitudes: Mitrasacme indica Wight, Halosciastrum melanotilingia [Boissieu] M. Pimen. et V. Tichomirov, Streptolirion volubile Edgew., Lipocarpha microcephala [R. Br.] Kunth, Pueraria lobata [Willd.] Ohwi, Belamcanda chinensis [L.] DC., Zoysia japonica Steud., Deinostema violacea [Maxim.] Yamazaki and Parthenocissus tricuspidata [Siebold et Zucc.] Planch. Most of the flora is represented by the species restricted to Southwest Primorye (seven endemic species) or the Korean Peninsula (seven hemiendemic species). A total of 50.2% of the 10 largest families are nemoral (preboreal) floras, located in the transitional zone of the boreal and nemoral floras. In terms of the structure of the ranked taxonomic spectrum of the largest families, the flora of Southwest Primorye is more similar to that of Northeast China with influence of the Korean flora.

• Advances in pediatric surgery
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• 제5권2호
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• pp.146-151
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• 1999

Neurocristopathy originates from aberrant development of the neural crest by genetic abnormality. Dysgenetic or neoplastic neurocristopathy mayor may not combine at one or more organs. Congenital central hypoventilation syndrome (Ondine's curse) is characterized by the respiratory depression during sleep, although showing normal ventilation while awake, because the baby does not responde to hypercapnea or hypoxia. One newborn girl, full-term, 3,020 g of birth weight with neurocristopathy is reported. It showed poor respiration at birth, and temporary Improvement with oxygen and respiratory stimulations. Abdomen was distended. Abdominal x-ray revealed small bowel obstruction and calcified opacity at the right lower quadrant. Because transitional zone was noticed at the distal jejunum during laparotomy, jejunostomy was performed. Several times trial of extubation have failed becaused of the repeated apneas. Brain sonography and echocardiogram were normal. The patient died of sepsis at 37 days of age. Para-aortic ganglioneuroblastoma was found at autopsy. In this case, congenital central hypoventilation syndrome, Hirschsprung's disease and congenital ganglioneuroblastoma are combined as a neurocristopathy.

• Ocean and Polar Research
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• 제35권4호
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• pp.415-425
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• 2013

In order to understand phytoplankton and bacterial distribution in tropical coral reef ecosystems in relation to the mangrove community, their biomass and activities were measured in the sea waters of the Chuuk and the Kosrae lagoons located in Micronesia. Chlorophyll a and bacterial abundance showed maximal values in the seawater near the mangrove forests, and then steeply decreased as the distance increased from the mangrove forests, indicating that environmental conditions for these microorganisms changed greatly in lagoon waters. Together with chlorophyll a, abundance of Synechococcus and phototrophic picoeukaryotes and a variety of indicator pigments for dinoflagellates, diatoms, green algae and cryptophytes also showed similar spatial distribution patterns, suggesting that phytoplankton assemblages respond to the environmental gradient by changing community compositions. In addition, primary production and bacterial production were also highest in the bay surrounded by mangrove forest and lowest outside of the lagoon. These results suggest that mangrove waters play an important role in energy production and nutrient cycling in tropical coasts, undoubtedly receiving large inputs of organic matter from shore vegetation such as mangroves. However, the steep decrease of biomass and production of phytoplankton and heterotrophic bacteria within a short distance from the bay to the level of oligotrophic waters indicates that the effect of mangrove waters does not extend far away.

• 한국작물학회지
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• 제34권s02호
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• pp.96-114
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• 1989

There are several meterorolgical stresses in the winter cereal crops. Among these stresses, cold injury is one of the most important stresses for wheat and barley production in Korea. The reduction in grain yield of the wheat and barley due to cold injury has occurred almost every year in Korea. The objective of the study was to get the basic information in relation to the cold injury and to detect the method minimizing the damage of cold injury. When the air temperature was the ranges of -13$^{\circ}C$ to -15$^{\circ}C$, the soil temperature at the crown part of the plant was very stable, whereas in the ranges of -2$^{\circ}C$ to -3$^{\circ}C$ the soil surface temperature was more unstable and cold than air and subterranean temperatures. The different parts of the plant in wheat and barley possess the different levels of cold hardiness. In comparison to the cold hardiness of plant parts, the leaf and crown are the less sensitive to cold injury than root and vascular transitional zone. The type and extent of stress is determined by the redistribution pattern of water during freezing. These types from freezing processes were three types: a) Equilibrium freezing pattern b) Non -equilibrium freezing pattern, c) Non-equilibrium freezing pattern typical of tender tissues. Cold hardiness in wheat plants were more harder than barley plants at vegitative stage, but inverted at the reproductive stage. Injuries by low temperature during the seasons of barley cultivation in Korea were occured mainly in four stage; in the first and third stage, frost injury occurs, the second stage, freezing injury, and the fourth stage, chilling injury.

• 한국지역지리학회지
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• 제22권1호
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• pp.25-35
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• 2016

본 연구는 영남지역 내 하위지역들을 구분하고 그 핵심부를 파악함으로써, 영남지역에 내재된 문화적 특성을 밝히는 기반을 제공하고자 하였다. 지역의 인문환경 요소인 행정구역과 방언, 그리고 자연환경 요소인 하천유역과 기후 분포를 중첩하고, 계수관과 유사한 환경요소를 갖는 범위를 하위지역으로 설정하였다. 요소들의 조합이 동일하게 나타나는 구획은 1개의 시 군으로 이루어진 것에서부터 6개의 시 군으로 이루어진 것에 이르기까지 모두 27개의 구획으로 구분되었다. 이들은 안동, 상주, 경주, 대구, 김해, 진주 증 6개의 하위지역으로 구분되었다. 각 하위지역은 유통에 장애가 되는 산줄기나 하천을 경계로 하며, 장애가 뚜렷하지 않은 경우에는 점이지대가 나타났다. 안동하위지역은 봉화와 예천, 영주, 의성, 군위, 영양, 청송, 영덕, 울진 등으로 이루어져 있으며, 상주하위지역은 상주와 구미, 김천, 문경을 포함한다. 경주하위지역은 경주와 영천, 포항 등을 포함하고, 대구하위지역은 대구와 칠곡, 고령, 성주, 경산, 청도 등으로 이루어져 있다. 김해하위지역은 김해와 양산, 부산, 울산, 창녕, 밀양 등을 포함하며, 진주하위지역은 진주와 합천, 의령, 사천, 고성, 통영, 남해, 함안, 거창, 함양, 산청, 하동, 창원, 거제 등으로 이루어져 있다.

• 한국습지학회지
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• 제11권2호
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• pp.29-38
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• 2009

연안습지는 바다와 육지의 전이지대로서 다양한 생물종다양성을 가진 중요한 지역이다. 식물상 분석 결과, 85과 212속 278종 27변종 5품종 등 총 310분류군이 확인되었다. 염생식물은 가는갯능쟁이, 수송나물, 나문재등 총 14분류군이 조사되었고 수생 및 습생식물은 좀깨잎나무, 여뀌, 흰꽃여뀌 등 총 23분류군이 관찰되었다. 귀화식물은 메밀, 소리쟁이, 양명아주 등 40분류군이 조사되었고 평균 귀화율 및 도시화지수는 각각 17.9 % 및 3.67 %로 분석되었다. 식물구계학적 특정식물은 봉의꼬리, 쇠고비, 홍지네고사리 등 총 28분류군이 확인되었다. 향후 연안습지의 식물상을 시계열적으로 분석해야 할 것이며, 염생식물에 대한 군락 동태 및 종조성에 대한 조사가 병행되어야 할 것이다.