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Volume 27 (1955)
- Issue 6 Pages 355-
- Issue 5 Pages 263-
- Issue 4 Pages 179-
- Issue 2-3 Pages 81-
- Issue 1 Pages 1-
Predecessor
Volume 27, Issue 2-3
Displaying 1-8 of 8 articles from this issue
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Sakae Morita1955 Volume 27 Issue 2-3 Pages 81-92
Published: 1955
Released on J-STAGE: September 24, 2012
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Tatsuya Iizuka1955 Volume 27 Issue 2-3 Pages 93-96
Published: 1955
Released on J-STAGE: September 24, 2012
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Tsuyuka Kakinuma, Hideyo Abe, Yoshiko Nomura1955 Volume 27 Issue 2-3 Pages 97-101_2
Published: 1955
Released on J-STAGE: September 24, 2012
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Shin-ichi Kato, Taro Sakuma, Yoshio Hayashi1955 Volume 27 Issue 2-3 Pages 103-113
Published: 1955
Released on J-STAGE: September 24, 2012
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Naobumi Kawai1955 Volume 27 Issue 2-3 Pages 115-131_7
Published: 1955
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThis is a comparative anatomical study of the bands of Sch re g e r in mammalian enamel. The observation was made on meridional ground section of the crown. The ground surface was stained with hematoxy lin.
Through the investigation it was established that the mentioned structure of the enamel has a characteristic feature specific to each kind of animal. The pattern of the bands of S chr eger can therefore be useful as one of the taxonomic criteria.
The zonial patterns can be classified into following main categories:
1) Carnivora type: The bands are conspicuous because the diazoniae consisting of cross sections of the enamel rods are bounded clearly against the parazoniae which are cut mostly in longitudinal direction and oriented parallel to the course of the bands. They stand verticalupon the dentine surface and describe rather a streight course. me indifferent bright layer under the enamel surface is relatively thin.
2) Primate type: The bands are relatively broad and each of them consists of 5-15 rods in its width. They stand oblique to the dentoenamel junction and run in more or less curved course. Leaving a thin indifferent layer above the dentine they vanish into a thicker bright layer under the enamel surface. The parazoniae are also composed with curved, oblique sections of the enamel rods so that the boundary of the dia- against the parazoniae is rather transitional.
3) Ungulate type: The bands are considerably long and the indifferent zones are broad in accordance with the thick enamel of the order. They stand oblique to the dento. enamel junction and are more or less curved. The boundary between para- and diazoniae is still more obscure than that in the Primate type. Even in the parazoniae a parallel arrangement of the longitudinally cut rods is scarcely to encounter. The rods in the diazoniae are arranged in rows.
4) Rodent type: The para- and diazoniae are in most Rodents bounded sharply against each other and no transition of the rods from a band to the adjacent one can be seen. They are straight and consist of rather small number of enamel rods, mostly of a single row of them. The Leporidae and Caviidae have, however, their own patterns of the bands of Schrege r. In general the molar teeth of the Rodents show zonial structures more or less modified from those found in the incisors.View full abstractDownload PDF (5528K) -
Tatsuya Iizuka1955 Volume 27 Issue 2-3 Pages 133-143
Published: 1955
Released on J-STAGE: September 24, 2012
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Terumasa Ikeda1955 Volume 27 Issue 2-3 Pages 145-154
Published: 1955
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSA large dose of saponin was repeatedly injected into adult rabbits, in an attempt to determine to what extent the repeated use of saponin may alter the pattern of colonization of bone marrow cells in different organs produced by a single injection of this agent.
It was revealed that no significant alterations in the pattern of colonization of bone marrow elements in different organs resulted from repetition of saponin injection, except for marked shift of these cells to the spleen. Even when the injection had been repeated as many as 31 times at intervals of 3 days, neither a particular increase of the early myeloid forms such as, proerythroblasts and promyelocytes, nor the occurrence of transition forms between the local fixed mesenchymal cells and the early myeloid forms, which may be regarded as indicative of an autochthonous formation of myeloid cells, could be demonstrated with certainty in any organs and tissues.
A marked shift of bone marrow cells to the spleen observed after repeated injections of saponin is interpreted as an effect of this agent causing dislodgment of these cells from the liver, lung and other organs and their transference to the spleen by way of the blood stream. It is to be emphasized that such shift by no means signifies that the spleen is the sole organ in which myeloid metaplasia may emerge.View full abstractDownload PDF (1526K) -
Jiro Koono1955 Volume 27 Issue 2-3 Pages 155-178
Published: 1955
Released on J-STAGE: September 24, 2012
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