巻号一覧
53 巻, 5 号
選択された号の論文の4件中1～4を表示しています
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Akoyoshi Takisawa, Yasuo Shimura, Katsuzi Kaneko1976 年 53 巻 5 号 p. 253-277
発行日: 1976/12/30
公開日: 2012/09/24
ジャーナル フリーThe effects of thyroxine o n the abductor muscles of the mouth during metamorphosis were investigated in Bufo vulgaris japonicus larvae. Normal differentiation of the muscles is compared in detail with that following 1-thyroxine treatment, using one of levatores hyoidei muscles, namely, m. orbitohyoideus as a structural indicator. Within this muscle, new myoblasts have been shown to differentiate into the adult muscle, m. depressor mandibulae. while all the larval muscles disappear through a degenerative process. Although concentrations below 0.005 ppm had no effect on muscle differentiation, rather interesting developmental changes occurred at higher doses. Treatment with thyroxine above 0.005 ppm induced the accelerated appearance of newly formed adult muscle and retarded the degeneration of larval muscles. This simultaneous action produced an array of anomalies. The concentration of thyroxine required for normal metamorphosis was lower than is generally held, namely less than 1.5 times that of the thyroid hormone concentration in normal tissues. The findings are discussed in terms of current theories of t h yroid action. The authors suggest that metamorphosis is biphasic process involving both adult neogenesis and larval degeneration. The results indicate that thyroxine accelerates adult neogenesis to a greater extent than the degeneration of the larval tissues.抄録全体を表示PDF形式でダウンロード (5520K) -
Hiroshi Nagai, Kimiko Kambara, Hiroko Sudo, Akio Hiura, Setsuya Yokoya ...1976 年 53 巻 5 号 p. 279-289
発行日: 1976/12/30
公開日: 2012/09/24
ジャーナル フリーUsing thirty-six fetuses fro m 13-21 days in gestation and young rats 1,2,10,15 day old, we made histological observations of the chronological growths of the incisors and molars in detailed developmental stages. The results are summarized in a table for convenience in the related research.抄録全体を表示PDF形式でダウンロード (3692K) -
Masaru Yamamoto, Kazuko Uchida, Toshio Ito1976 年 53 巻 5 号 p. 291-303
発行日: 1976/12/30
公開日: 2012/09/24
ジャーナル フリーRegeneration of olfactory c ells (bipolar neurons) has been revealed in the normal olfacotry epithelium of the adult bat. Some of the interstitial cells detectable between the perikarya of the olfactory cells and the basal cell layer of the epithelium are referred to as the precursors of the olfactory bipolar neurons. It is further suggested that other interstitial cells may probably participate in the regeneration of supporting cells of the olfactory epithelium.抄録全体を表示PDF形式でダウンロード (2923K) -
Hideo Isono, Shizuko Shoumura, Seiichi Taka, Tomo Yamahira, Shinitiro ...1976 年 53 巻 5 号 p. 305-321
発行日: 1976/12/30
公開日: 2012/09/24
ジャーナル フリーThe newt parathyroid glan d after administration of atropine or pilocarpine was studied with electron microscope. Serum calcium concentration was a l most unchanged after administration of atropine or pilocarpine. Remarkable changes in the ultrastructure of the basal cells were not recognized after administration of agents. In most suprabasal cells after administration of atropine, the elements of granular endoplasmic reticulum and the Golgi apparatus were so well developed as compared with the control animals. The number of secretory granules, heterogeneously dense bodies and lipofuscin-like bodies was decreased, while the number of vacuolar bodies was increased after administration of atropine. Most of the heterogeneously dense bodies consisted of the vesicular type at 3,6 and 12 hr after injection. In most suprabasal cells after administration of pilocarp i n e, cell. organelles such as granular endoplasmic reticulum and tho Golgi apparatus became smaller in size than those of the control newts. Secretory granules, heterogeneously dense bodies and lipofuscin-like bodies were increased, while vacuolar bodies were decreased in number after administration of pilocarpine. Most of the heterogeneously dense bodies consisted of the lysosomal type at 3,6 and 12 hr after injection. Such ultrastructural alterations in the newt parathyroid gland after administration of atropine or pilocarpine would support the participation of the autonomic nervous system.抄録全体を表示PDF形式でダウンロード (6283K)
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