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Volume 64 (1987 - 198･･･
- Issue 6 Pages 291-
- Issue 5 Pages 223-
- Issue 4 Pages 157-
- Issue 2-3 Pages 99-
- Issue 1 Pages 1-
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Volume 64, Issue 5
Displaying 1-5 of 5 articles from this issue
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C K TAN, Colin B C TAN, H L CHAN1987 Volume 64 Issue 5 Pages 223-241
Published: 1987
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe outer surface of scales at the anterior end of the lateral line of a Chaetodon fish, Chelmon rostratus, were studied under the scanning electron microscope after fixation with mixed aldehyde both before and after decalcification with glacial acetic acid. In the anterior, dorsal and ventral fields of the scale, numerous concentrically-arranged ridges called circuli were observed. Each circulus bore numerous projections called denticles. In addition, grooves, which are called radii, were observed to radiate out from the focus of the cell to the anterior margin of the scale and were seen only in the anterior field. A sulcus with two open ends was observed to be present between two adjacent circuli and each one was observed to open into the radius. After treatment with acetic acid, the circuli and denticles were no longer present. In place of the circuli were low ridges and blebs of the limiting membrane which separated the calcified from the fibrillary layers of the scale. The posterior field of the scale bore numerous old ctenii called remnant ctenii while the posterior margin of the scale bore sharp cone-like ctenii. Each remnant ctenus appears like a truncated triangular structure with its truncated apex abutting on to the base of the ctenus posterior to it. However, after treatment with acetic acid, the remnant ctenii were observed to be made up of an uncalcified structure which has a Y-shaped configuration, each Y interlocking with the Y posterior to it. After treatment with acetic acid too, chromatorphores became evident. The present findings are compared with those by other works in other fishes and their functional significance discussed.View full abstractDownload PDF (5836K) -
Masumi AKITA, Seong Ho LEE, Katsuji KANEKO1987 Volume 64 Issue 5 Pages 243-251
Published: 1987
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe effects of various metal salts on the staining of elastic fibers with hematein were tested at light and electron microscopic levels. Potassium tungustate and sodium molybdate were effective at light and electron microscopic levels. Ammonium metavanadate, stannous chloride, potassium tellurate and uranyl acetate moderately stained elastic fibers at light microscopic level. However, these metal salts, except stannous chloride, did not show the marked enhancement of the electron density of elastin. Stannous chloride moderately enhanced the electron density of elastin. It was suggested that hematein is capable of binding to elastin and subsequently or simultaneously chelating metal ions which render the elastin electorn opaque.View full abstractDownload PDF (2736K) -
Carlos A, MANDARIM-DE-LACERDA, Francisco Jose, B. SAMPAIO1987 Volume 64 Issue 5 Pages 253-257
Published: 1987
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe hearts of four human embryos in stage 17 were studied by means of light microscopy and quantitative methods. The serial sections of the mebryos were projected by using a microprojector for the measurement of the cardiac diameters and cardiac profile areas. The calculated heart volume in stage 17 was 6.69±0.55 mm3 (mean±standard error of the mean). The cardiac volume can be considered an accessory index for embryonic classification.View full abstractDownload PDF (1760K) -
Asok GHOSH, Monisha MUKHERJEE1987 Volume 64 Issue 5 Pages 259-263
Published: 1987
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe effects of cholinergic agents on the testis and adrenal cortex were evaluated through histokaryometric assessments after administrations of acetylcholine and atropine in weaver bird. The prominent degeneration of the male gonad in the drug-treated birds hinted towards vasoconstriction. Moreover, the concimitant enlargement of adrenocortical regions indicated probable mediation of corticoids in controlling gonadal functions.View full abstractDownload PDF (2020K) -
Masashi SAKUMA1987 Volume 64 Issue 5 Pages 265-289
Published: 1987
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe mesiolingual randtubercle located on the mesiolingual corner of the protocone is one of the anomalous variables of the maxillary molar. This prominence was found on the second left maxillary molar of a 20-year-old Chewa girl residing in East-Central Africa. By some dental anatomists, this anomalous tubercle is regarded as a homologue of the protoconule, which has been assumed to be a primitive structure. In the present case, however, the hypocone reduction is clear, and the oblique ridge is not observed at all. Moreover, the mesial marginal ridge is interruped by a mesial groove of this trait. Judging from these findings, the mesiolingual randtubercle in the human dentition may not have any phylogenetical significance.View full abstractDownload PDF (7285K)
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