Proceedings of the Japan Academy, Series B

Trilobites of Thailand and Malaysia

Teiichi KOBAYASHI, Takashi HAMADA

1981 Volume 57 Issue 1 Pages 1-6
Published: 1981
Released on J-STAGE: October 06, 2006

DOIhttps://doi.org/10.2183/pjab.57.1

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A Karyotype Study of Colored-Carp (Cyprinus carpio)

A Preliminary Report

Yoshio OJIMA, Akinori TAKAI

1981 Volume 57 Issue 1 Pages 7-12
Published: 1981
Released on J-STAGE: October 06, 2006

DOIhttps://doi.org/10.2183/pjab.57.7

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Karyotype studies were undertaken in the Japanese colored-carps, the 'Ogon' (Golden carp), the 'Kohaku' (Red and white carp) and the 'Sanshoku' (Tripple color carp) by way of comparison with the chromosomes of the wild black-carp. The basic karyotype of the colored-carp consisted basically of 6 pairs of metacentrics; 17 paired and an unpaired submetacentrics; 25 paired and an unpaired subtelocentrics and one L.C., being 2n, 99 in total. But, it is usual that the diploid number of chromosomes of the colored-carp appeared as 2n, 100 containing an L.C. and a single micro-chromosome.

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Cytogenetic Studies on the Indian Spiny Mouse, Mus platythrix. I

Frequency of Sister Chromatid Exchanges in Lung Primary Cultures

Tosihide H. YOSIDA, Toru INOUE

1981 Volume 57 Issue 1 Pages 13-17
Published: 1981
Released on J-STAGE: October 06, 2006

DOIhttps://doi.org/10.2183/pjab.57.13

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Sister chromatid exchanges (SCEs) in the lung cultured cells of the Indian spiny mouse were examined at several concentrations of BrdU. The spontaneous occurrence of SCEs in this animal was determined to be 11.1/cell at the dose of 0.5μg BrdU. The frequency value was slightly higher than that of the house mouse. This may be due to less C-band heterochromatin in the Indian spiny mouse than in the house mouse.

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Active Development in Preimplantation Stages of Giant Digynic Triploids in the Chinese Hamster

Kenji FUNAKI

1981 Volume 57 Issue 1 Pages 18-22
Published: 1981
Released on J-STAGE: October 06, 2006

DOIhttps://doi.org/10.2183/pjab.57.18

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Developmental and chromosomal aspects of giant digynic triploids were studied with three 4-cell embryos, one 8-cell embryo and one blastocyst. Without exception, they displayed normal development and a complete set of triploid chromosomal complements. Their mitotic activity was normal or even high when compared with their diploid sibs. The giant blastocyst had the largest number of blastomeres and metaphasic cells among eight blastocysts of the same batch. Suggestion is made that the triploids developing from giant oocytes are more favoured for preimplantation development than the triploids caused by any other mechanism.

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Gizzard Actin Confers a Magnesium Sensitivity to Skeletal Muscle Myosin at Low Ionic Strengths

Takashi MIKAWA, Koscak MARUYAMA

1981 Volume 57 Issue 1 Pages 23-28
Published: 1981
Released on J-STAGE: October 06, 2006

DOIhttps://doi.org/10.2183/pjab.57.23

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