巻号一覧
53 巻 (1976 - 1977)
- 6 号 p. 323-
- 5 号 p. 253-
- 4 号 p. 143-
- 2-3 号 p. 77-
- 1 号 p. 1-
53 巻, 2-3 号
選択された号の論文の5件中1～5を表示しています
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Fusao Yamasaki, Hajime Satomi, Toshiro Kamiya1976 年 53 巻 2-3 号 p. 77-91
発行日: 1976/08/20
公開日: 2012/09/24
ジャーナル フリーWe observed two tongues of Pontoporia blainvillei (body length 98.5 and 171 cm, females) macro- and light microscopically. The Pontoporia's tongue is divided into two different parts: the front and the rear. The front part, the anterior one-third in the adult and the anterior one-fourth in the young, is nearly semicircular in outline having a completely smooth dorsum and a marginal free surface without an anterior free tip. The lateral free edges are scalloped in appearance but in the young many projections, about 3 mm long, can be seen at that position. The rear part continues from the front part at nearly the same level with irregular fissures and a remarkable longitudinal fissure present on the mid-line. But these features were unclear in the young. No trace of the sulcus terminalis and foramen caecum can be found on the tongue. Neither lingual papillae nor taste buds exist over the entire tongue. Many small pores are found on the dorsum from the mid-region of the front part to the base of the epiglottis. These pores also can be seen at the caudo-lateral free surface of the front part and on the continuing oral wall of the rear part. The pores are the orifices of the excretory canals of well developed salivary glands which are especially crowded at the rear part and are mucous in nature. Very scarce lymphatic nodules are observed in the lamina propria mucosae of the tongue and the neighboring part. Lingual tonsils can The tongue of Franciscana (La Plata Dolphin), Pontoporia blainvillei 85not be observed in Pontoporia. These findings obtained from our Pontoporia were compared with those of the other two kinds of Platanistidae (Platanista and Inia) we observed.抄録全体を表示PDF形式でダウンロード (5533K) -
Kohei Shiota1976 年 53 巻 2-3 号 p. 93-104
発行日: 1976/08/20
公開日: 2012/09/24
ジャーナル フリーCommercial preparations of p olychlorinated biphenyls (PCBs), Kanechlors 300 and 500, were mixed with food and given to pregnant Sprague-Dawley rats throughout gestation at levels of 20,100 and 500 ppm. Treatment with 500 ppm of Kanechlor 500 resulted in decreased maternal weight gain and suppressed food consumption. At 20 and 500 ppm of Kanechlor 300 and 500 ppm of Kanechlor 500, the fetal weight decreased significantly. Resorptions and major malformations were not increased by the Kanechlor treatment. These results indicate that PCBs at a high dose level are embryotoxic in the rat, although their teratogenic potential is not evidenced.抄録全体を表示PDF形式でダウンロード (1897K) -
Kohei Shiota1976 年 53 巻 2-3 号 p. 105-114
発行日: 1976/08/20
公開日: 2012/09/24
ジャーナル フリーSprague-Dawley rats receiv e d 20 or 100 mg/kg/day of Kanechlor 500 on days either 8-14 or 15-21 of gestation. Controls were given the solvent, olive oil, only. Offspring were evaluated for activity and emotionality on the open field and for maze-learning ability on the waterfilled multiple T-maze. The results showed that the prenatal treatment with PCBs altered learning ability as measured by the water maze, although activity and emotionality were similar to those of controls. On the maze-learning test, the offspring exposed to the Kanechlor in utero learned the maze slower than the control rats, and dose-response relationships appeared evident in this parameter. These results were discussed with reference to previous findings in this area, and the potential values of behavioral teratology were stressed.抄録全体を表示PDF形式でダウンロード (1403K) -
Kyozo Takahashi, Fusao Yamasaki1976 年 53 巻 2-3 号 p. 115-125
発行日: 1976/08/20
公開日: 2012/09/24
ジャーナル フリーThe extrahepatic bile duct s of four Pontoporia blainvillei were described macro- and light microscopically. The common hepatic duct is short and is embedded in the cranial thick potrion of the pancreas, and, after receiving the two main pancreatic ducts, enters the duodenum proper at its curved initial part. Since Pontoporia has no gall-bladder the common hepatic duct perforates the duodenal wall as the hepatopancreatic duct which is located intramurally for about 2 cm. No socalled duodenal pouch can be seen there. The papilla duodeni is not remarkable but is located at the caudal end of the plica longitudinalis duodeni. The glandular structures in the bile-passage first appear at the extrahepatic duct. The nature is mucous tubulo-alveolar. The duct glands, which are located in the duodenal wall, are well developed and are similar to those of the duodenum.抄録全体を表示PDF形式でダウンロード (4500K) -
Hideo Isono, Shizuko Shoumura, Seiichi Takai, Tomo Yamahira, Shinitiro ...1976 年 53 巻 2-3 号 p. 127-141
発行日: 1976/08/20
公開日: 2012/09/24
ジャーナル フリーThe parathyroid gland of R ana rugosa under stimulated circumstances (administration of EDTA) was studied with electron microscope. The large chief cell in the peripheral region and the s m all chief cell in the central region of the parathyroid gland were distinguishable. The former was active and the latter was inactive in function. It was difficult to identify the light and dark chief cells. Remarkable changes in the fine structure of the small chief cell were not observed in the EDTA treated frogs. The principal variations of the experimental frogs were the increase in the number of cell organelles and of secretory granules (though granules decreased temporally in number) in most large chief cells, and the appearance of dense materials in the enlarged intercellular spaces. The number of secretory granules decreased at 0.5 hrs after administration of EDTA (serum calcium concentration was very low), and thereafter increased. It could be suggested that the secretory function of the parathyroid gland was accelerated from depressed serum calcium levels and temporary release of many secretory granules was induced in order to keep serum calcium at control level. Secretory granules were observed in the peripheral cytoplasm and dense materials thought to be derived from the contents of secretory granules were seen in the enlarged intercellular spaces. These observations suggest that secretory granules may be released by eruptocrine type of secretion. Most of the large chief cells at 0.5,1 and 2 h r s after administration of EDTA were observed in active stage of secretory cycle as compared with the control frogs.抄録全体を表示PDF形式でダウンロード (9308K)
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