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Volume 51 (1976)
- Issue 6 Pages 377-
- Issue 5 Pages 297-
- Issue 4 Pages 223-
- Issue 3 Pages 149-
- Issue 2 Pages 71-
- Issue 1 Pages 1-
Volume 51, Issue 4
Displaying 1-8 of 8 articles from this issue
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NOBUMICHI INOMATA, MASASUKE OKAMOTO, HITOSHI ASAMI1976 Volume 51 Issue 4 Pages 223-228
Published: 1976
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSBehavior of unstable lines of telocentric chromosomes in cultured callus cells was investigated. Callus tissues were induced from the germinated seeds in the medium of RM-64 with 3.0mg/l of 2, 4-C. Short telos of 3BS1 were most unstable. In the 3BS1 line the cells with less than diploid chromosome number were more unstable than those above diploid chromosome number. Long telos of 3BS8 were more stable than those of 3BS1 and 3BS4. Different stabilities in callus tissues were observed between the line of 3BS4 and 3BS8, although stabilities of 3BS4 and 3BS8 were almost the same under natural condition.View full abstractDownload PDF (820K) -
YUZURU OGUMA1976 Volume 51 Issue 4 Pages 229-236
Published: 1976
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSA new kind of inversion, named In2RB, has been found in the Engaru population of Anopheles sinensis. This is a simple inversion located at 9A-11D on the right arm of the second chromosome. Inversion polymorphism was investigated on In2RA, In2RB and In3RA in material from 11 localities. In2RA was not observed at all the localities and In2RB was found only in the Engaru population. In3RA was observed in four strains with low frequency. The hybrid chromosomes obtained from crosses between the Engaru strain and either the Kanoya or the Yakumo strains showed incomplete synapsis along the whole lengths of the chromosome arms.View full abstractDownload PDF (3856K) -
I. RADIATION- AND CHEMICAL-INDUCTION OF NUTRITIONALLY DEFICIENT AND SUFFICIENT MUTANTS IN CHINESE HAMSTER HAI CELLS IN VITROSADAYUKI BAN, FUMIO SUZUKI, MASAKATSU HORIKAWA1976 Volume 51 Issue 4 Pages 237-251
Published: 1976
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSA forward mutation system using prototrophic CH-hai Cl 23 cells (Ala+, Asn+, Pro+, Asp+, Hyp+, Glu+) isolated from an original Chinese hamster hai cell line was found to be much more sensitive than a reverse mutation system using auxotrophic CH-hai Cl 3 cells (TdR-), for detecting the mutations induced by chemical carcinogens or mutagens (4-nitroquinoline 1-oxide, N-methyl-N'nitro-N-nitrosoguanidine, ethyl methane-sulfonate), as well as by X-rays and UV. It was found that the antimicrobial food additive, 2-(2-furyl)-3-(5-nitro-2-furyl) acrylic acid amide (furylfuramide: FF or AF2) has highly mutagenic activity so far as it was tested by the forward mutations. The forward mutation system, from prototrophic CH-hai Cl 23 cells to auxotrophs, established in this study can be applied as a useful system for detecting environmental mutagens and for elucidating the mechanisms of somatic cell mutation.View full abstractDownload PDF (1641K) -
II. RADIATION-INDUCTION OF 8-AZAGUANINE-RESISTANT AND -SENSITIVE MUTANTS IN CHINESE HAMSTER HAI CELLS IN VITROMASAKATSU HORIKAWA, FUMIO SUZUKI, SADAYUKI BAN1976 Volume 51 Issue 4 Pages 253-264
Published: 1976
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSIn order to establish a sensitive assay system for the mutagens and to understand the nature of the differences in the mutation frequency among various somatic mammalian cell lines at various genetic markers reported by many workers, we examined the frequency of the forward and reverse mutations induced by X- and UV-irradiation, by using 8-azaguanine (8AG)-sensitive cells (prototrophic CH-hai Cl 23 cells) isolated from an original Chinese hamster hai cell line and 8AG-resistant cells isolated from CH-hai Cl 23 cells. However, both the mutation systems, especially the forward mutation system used here, were less sensitive as the assay system of the mutations induced by X-rays or UV, compared with the nutritional forward mutation system used previously (Ban et al. 1976). These results underline the complexity of the study of mutagenesis using cultured mammalian cells, particularly because the induced mutation frequency in cultured cells is affected by the factors of the mutation expression time, the size of the cell inoculum, the concentration of the selective agent, etc.View full abstractDownload PDF (1475K) -
AKISHI FUKATAMI1976 Volume 51 Issue 4 Pages 265-276
Published: 1976
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSChromosomal polymorphism in natural populations of Drosophila lutescens, a semidomestic species, were studied. Chromosomal variations in six natural populations and thirty local strains maintained in laboratory culture were examined. In all populations remarkable inversion polymorphism was observed in four arms of the second and the third chromosomes. It was shown that there were clinal changes in the frequency of some gene arrangements (2L A, 3L A, 3L C and 3R D) from north-east to south-west in Japan. It is assumed that the main factor controlling the inversion frequencies is temperature.View full abstractDownload PDF (1085K) -
YASUSHI TAKENOUCHI1976 Volume 51 Issue 4 Pages 277
Published: 1976
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSDownload PDF (90K) -
YASUSHI TAKENOUCHI1976 Volume 51 Issue 4 Pages 279-283
Published: 1976
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe chromosomes of four Catapionus gracilicornis male were studied. Three had the ordinal basic number 10AA+Xyp in haploid (2n=22) and remaining one, 11AA+Xyp (2n=24). The detailed investigation revealed that the latter chromosome formula was brought about by Robertsonian fission.View full abstractDownload PDF (1645K) -
MASAO KIMURA1976 Volume 51 Issue 4 Pages 285-288
Published: 1976
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSDownload PDF (708K)
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