细化搜索
结果 1-10 的 25
Diethylnitrosamine-induced hepatic tumorigenesis in rats 3. Electron microscopic observaton of liver tissue
1999
Kwak, S.D. | Kim, C.S. | Koh, P.O. | Yang, J.H. | Seo, D.L. (Gyeongsang National University, Chinju (Korea Republic). Institute of Animal Medicine, College of Veterinary Medicine)
The study was designated to investigate the electron microscopic findings following diethylnitrosamine (DEN) treatment in rats. Forty four male (Srague Dawley) rats were continuously given water containing 0.01% DEN for 13 weeks and livers of five rats with more tumor lesions at 16 and 17 weeks after initial treatment were used as EM materials. In transmission electron microscopic findings, most small-sized hepatocytes were active cells containing large mount of organelles, but light (pale staining) hepatocyte among small-sized hepatocytes were injured cells containg disorganized organelles. Tumor cells among small-sized hepatocytes were irregularly arranged and have ;leomorphic nuclei containing electron dense chromatin but the organelles in cytoplasm were swelled. Large-sized hepatocytes were active cells with condensed chromatin but the cytoplasm of these cells were pale due to be injured and dilated organelles. Dark hepatocytes were apoptotic cells with homogenous pyknotic nuclei and cytoplasm, and the cytoplasm of these cells contained dilated smooth endoplasmic reticulum (sER) but these sER were non-vesiculated. Cholangiocarninoma cells were crowed and were pale by far less number of organelles in cytoplasm and nuclei. In scanning electron microscopic findings, the lumens of portal veins, bile canaliculi, bile ductules, bile ducts and sinusoids were dilated and have irregular folded inner surface by protruded parenchyma.
显示更多 [+] 显示较少 [-]Scanning electron microscopical study on the uterine development of fetuses and neonates in Korean native goats
1999
Jung, S.H. (Chinju Health College, Chinju (Korea Republic).) | Kim, C.S. | Kwack, S.D. (Gyeongsang National University, Chinju (Korea Republic). Institute of Animal Medicine, College of Veterinary Medicine) | Lee, J.H. (Ulsan University, Ulsan (Korea Republic). College of Medicine)
The development of uterus in fetuses on 60, 90 and 120 days of gastation and neonates of Korean native goats was investigated by scanning electron microscopy. The results were summarized as follows; 1. in the 60-day-old fetuses, the short microvilli were sporadically observed on the luminal surface of the endometrium. 2. In the 90-day-old fetuses, the mucosal folds, polygonal microridges, numerous microvilli, flower-like-buds, and domeshpaed or crateriform area were also observed on the luminal surface of endometrium. 3. In the 120-day-old fetuse, the primordial caruncles(nodules) of the endometrium were developed conspicuously and long microvilli were developed densely. 4. In the neonates, thecaruncles and microvilli of the endometrium were more developed than those of 120-day-old fetuses.
显示更多 [+] 显示较少 [-]Electron microscopical study on the cecal development in fetuses and neonates in Korean native goats
1999
Cho, G.H. | Kim, C.S. (Gyeongsang National University, Chinju (Korea Republic). Institute of Animal Medicine, College of Veterinary Medicine) | Lee, J.H. (Ulsan University, Ulsan (Korea Republic). College of Medicine)
The morphological studies on the cecal development in the 60-, 90-, and 120-day-old fetuses and the newborns of Korean native goats were investigated by scanning and transmission electron microscopy. The results were summarized as follows; Scanning electron microscopic studies: 1. In the 60-day-old fetuses, fold-like shpaes protrusion oon the cecal mucosa surface appeared. In the 90-day-old fetuses, the cecal villi appeared to be columnar shpaes. In the 120-day-old fetuses, the cecal villi showed variou tongue-like or columnar shpaes. In the newborns, only the rudimental trace of the villi and the intestinal glands were observed. 2. In the 60-day-old fetuses, the cecal epithelia were simple columnar in some areas and stratified columnar in others, and the epithelial cells contained nuclei, nucleoli, ER, mitochondria, Golgi complexes, zonula occuludens, desmosomes, digitiform intercellular junctions, and large masses of the glycogen granules. 3. In the 90-day-old fetuses, the cecal epithelia were simple columnar in some area and stratified columnar in other. The microvilli of the cecal epithelia became much larger and longer than those in the 60-day-old fetuses, and intercellular junctions were developed, and increased numbers of ER, mitochondria, Golgi complexes were observed and the goblet cells contained a lot of the secretory granules. 4. In the 120-day-old fetuses, the cecal epithelia were only columnar in all areas. Microvilli and cytoplasmic organelles were well developed and the irregular annular nuclei were observed. 5. In the newborns, the cecal epithelia were covered with extensive microvilli, and the goblet cells with secretory granules were protruded into lumen. And some goblet cells secreted the secretory granules into the lumen.
显示更多 [+] 显示较少 [-]Immunohistochemical study on the atratic and the growing follicles after experimental superovulation in rats 2. Atresia and growing of follicles
1997
Kwak, S.D. | Koh, P.O. | Kim, C.S. (Gyeongsang National University, Chinju (Korea Republic). College of Veterinary Medicine)
Ultrastructural studies on the parotid gland of Korean native goat
1994
Lee, H.S. | Lee, I.S. | Kang, T.C. (Seoul National University, Suwon (Korea Republic). College of Veterinary Medicine) | Kim, J.S. (Taegu University, Kyungsan (Korea Republic). College of Rehabilitation)
An occurrence of canine herpesvirus infection in Korea
1992
Kim, O.J. | Bak, U.B. (Seoul Nat'l Univ., Suwon (Korea Republic). Coll. of Veterinary Medicine) | An, S.H. | Kim, D.H. | Shin, J.H. (Rural Development Administration, Anyang (Korea Republic). Veterinary Research Inst.)
Study on functional elevations of sperm-host glands in domestic hens, 1; Histochemical and electron microscopical observations
1991
Kwak, S.D. | Woo, H.C. | Choe, S.Y. (Gyeongsang National Univ., Chinju (Korea Republic). Coll. of Veterinary Medicine)
The effect of selenium on renal lesions induced by adriamycin in rats
1997
Park, E.S. | Lee, J.S. (Seoul National University, Suwon (Korea Republic). College of Veterinary medicine)
Morphological studies on the development of the prenatal and postnatal rat stomach 2. Transmission electron microscopical observations
1997
Chung, H.S. | Kim, C.S. | Kwak, S.D. (Kyongsan National University, Chinju (Korea Republic). Institute of Animal Medicine)
Morphological studies on the development of the prenatal and postnatal rat stomach 1. Light and scanning electron microscopical observations
1997
Chung, H.S. | Kim, C.S. (Kyongsang National University, Chinju (Korea Republic). Institute of Animal Medicine) | Lee, J.H. (Ulsan University, Ulsan (Korea Republic). College of Medicine)