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허상우,김신권,김대중,이배익,박수진,황형규,전제천,명정인,이치훈,이영돈 한국발생생물학회 2016 발생과 생식 Vol.20 No.3
In this study, we investigated the characteristics of CCK-producing cells and mucus-secreting goblet cells with respect to stomach fish and stomachless fish of the Gobiidae in order to provide a basis for understanding the digestive physiology. Hairychin goby (Sagamia geneionema), which is stomachless fish, the numbers of mucus-secreting goblet cells is highest in the posterior intestine portion (P<0.05), while CCK-producing cells are scattered throughout the intestine. Gluttonous goby (Chasmichthys gulosus), which is stomach fish, mucus-secreting goblet cells are most abundant in the mid intestine portion (P<0.05), whereas CCK-producing cells are observed only in the anterior and mid intestine portion. Trident goby (Tridentiger obscurus) which is stomach fish, mucus-secreting goblet cells were most abundant in the mid intestine portion (P<0.05). CCK-producing cells are found in the anterior and mid intestine portion. Giurine goby, Rhinogobius giurinus which is also stomach fish, the largest number of mucus-secreting goblet cells showed in anterior intestine portion except for esophagus (P<0.05). CCK-producing cells are present only in the anterior and mid intestine portion. In S. geneionema, digestive action occurs in the posterior intestine portion to protect and functions to activate digestion. In contrast, in C. gulosus, T. obscurus and R. giurinus, their digestive action occurs in the anterior and mid intestine portion to protect and functions to activate digestion. Further studies of the modes of food ingestion by these fish, the contents of their digestive tracts, and the staining characteristics of the goblet cells need to be carried out.
넙치(Paralichthys olivaceus)용 고효율 곤충배합사료 양식현장적용 평가
허상우,이진혁,이승한,정성목,김강웅 한국수산과학회 2022 한국수산과학회지 Vol.55 No.5
We evaluated a worm-based extruded pellet diet with black soldier fly Hermetia illucens larvae (BSF) meal and BSF oil for olive flounder Paralichthys olivaceus through field feeding experiments at a commercial aquafarm. We prepared two experimental diets by replacing fish meal and fish oil with BSF meal and BSF oil (BEP-1, BSF meal 7%, BSF oil 1%) and (BEP-2, BSF oil 2%), respectively. We prepared raw-fish based moist pellets (MP) for comparison between the two experimental diets. We distributed the olive flounder (220±6.29 g) in square (10 m×10 m×1 m) concrete, 100 ton tanks at a density of 1,600 fish per tank (n=3) in triplicate for each dietary treatment. We fed the diets to the fish to apparent satiation for 7 months. At the end of the feeding trial, we found no substantial differences between the groups in terms of growth performance, survival, or feed utilization. None of the diet groups showed any changes in either hematological or non-specific immune responses. The histological observation of the intestine showed that the goblet cell number and cholecystokinin-producing cell activity increased in the fish fed the BEP diet compared with the those of the fish fed the MP diet. These results indicated that dietary BSF meal and oil can be used for olive flounder without compromising growth or, hematological and histological parameters.
제주연안에 서식하는 망둑어과 어류의 소화관 구조 및 조직학적 연구
허상우,노섬,김형배,이영돈 한국어류학회 2004 韓國魚類學會誌 Vol.16 No.1
제주연안에 서식하는 망둑어과 어류인 바닥문절, S. geneionema과 별망둑, C. gulosus 소화관의 형태와 조직학적 특성을 조사하였다. 바닥문절은 소화관 길이가 짧고 (RLG 0.45), 단순한 형태를 가지고 있으며, 위와 유뮨수는 가지고 있지 않다. 별망둑은 소화관 길이가 짧고 (RLG 0.43). 단순한 형태의 위를 가지고 있으며, 유문수는 가지고 있지 않다. 별망둑은 위선이 잘 발달된 위를 가지고 있다. 바닥문절 소화관의 점막주름은 다양한 형태를 가지고 있다. 장에 있어서 근육층의 두께, 점막주름의 길이는 유사한 양상을 하였다. 장 점막주름의 길이는 두 종 모두 전장부에서 다른 부분보다 길었다. 장 근육층의 두께는 두 종 모두 전장부에서 후장부로 갈수록 두꺼워지는 양상을 나타내었다. 점액을 분비하는 배상세포는 바닥문절의 경우 후장부, 별망둑의 경우 중장부에 가장 많이 분포하였다(P〈0.05). The morphology and histological characteristics of the digestive tract of two gobiid species, hairychin goby (Sagamia geneionema) and gluttonous goby (Chasmichthys gulosus), were investigated in the coastal area of the Jeju Island, Korea. The hairychin goby has a short (relative length of gut 0.45), simple gut and no obvious stomach and pyloric caeca. The gluttonous goby has a short (relative length of gut 0.43), simple gut and stomach, but no obvious pyloric caeca. Gastric gland cells are well developed in the stomach of gluttonous goby. In the mucosal fold of the intestine, hairychin goby has a regular branched form and gluttonous goby has a rather complex branched form. The length of mucosal fold and thickness of the muscle layer were similar in the two species. The length of mucosal fold was longer in anterior intestine portion, and the thickness of muscle layer was thicker in posterior intestine portion. In the number of mucous - secreting goblet cells, the hairychin goby was higher in the posterior intestine portion, and the gluttonous goby was higher in the mid-intestine portion (P< 0.05).
Morphology of Digestive Tract and Its Goblet Cells of Giurine Goby Rhinogobius giurinus
허상우,송영보,이치훈,임봉수,이영돈 한국수산과학회 2005 Fisheries and Aquatic Sciences Vol.8 No.2
Morphology, histology, and histochemical characteristics of the digestive tract of the guirine goby (Rhinogobius giurinus: Gobiidae), collected from the coast of Jeju Island, Korea, were investigated. The digestive tract of R. giurinus, which is a brackish water species, has a short (relative length of gut=0.42), simple, and narrow gut. The gastric glands are well developed in the stomach, but pyloric caeca are absent. The mucosal folds are regularly branched, and the muscularis externa is thickest in the esophagus, which also contained the most mucus-secreting goblet cells (P<0.05). In R. giurinus, digestive function occurs in the anterior portion of the digestive tract, where mucus protects the tract from the actions of digestive enzymes and functions to activate digestion.
뱀장어 Anguilla japonica의 해수순치 후 기관세포의 조직 변화
이승현,허상우,이치훈,허성표,이영돈 제주대학교 해양과환경연구소 2014 해양과환경연구소 연구논문집 Vol.38 No.-
In teleosts fish, a number of species perform spectacular migrations between seawater and freshwater environmental conditions. Japanese eel, Anguilla japonica is a commercially important species and catadromous fish that grows in fresh water, and moves to the sea to spawn. This study investigated the histological changes of organs of A. japonica based on acclimated to the aquatic environment of the seawater. To understand histological changes of organs tissue of A. japonica based on fresh water condition and seawater condition, 6 specimens (mean TL 62±2 cm, mean BW 578±43 g) were used for comparative observation using gills and skin. A large amount of mucous cells were found and chloride cells were rarely observed in the gills in fresh water condition. However, mucous cells were not observed and chloride cells were increased in seawater condition. In the skin, mucous cells were observed in each layer of epidermis from fresh water condition. On the other hand, mucous cells of seawater condition were decreased in each layer of epidermis. In the future, additional comparative studies on environmental characteristics related to the aspect of artificial sex maturation by hormone treatment, another organ tissue changes and osmotic pressure will be necessary.
이치훈,허상우,Akihiro Takemura,이영돈,Kazunori Takano 한국발생생물학회 2010 발생과 생식 Vol.14 No.1
We investigated the androgenic effects of 11-ketotestosterone (11-KT) on gonadal sex reversal and spermatogenesis in honeycomb grouper Epinephelus merra by method of gonadal biopsy. 11-KT was injected intramuscularly at a concentration of 1 and 10 ㎍/g body weight. The proportion of cross sectional area of the gonad occupied by each germ cell type was measured and compared pre- and post-injection group. During the sex change phase, the distribution ratio of oocytes was decreased in all fish of 11-KT treatment group while the distribution ratio of spermatocytes was increased than pre-injection group. In male phase, all fish of 11-KT treatment group shown the increased distribution ratio of spermatocytes, but the distribution ratio of spermatozoa was decreased than pre-injection group. The present results suggest that 11-KT can stimulate degeneration of oocytes, proliferation of spermatocytes and spermiation in honeycomb grouper.