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Volume 34, Issue 4
Displaying 1-5 of 5 articles from this issue
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Kazuo SAITOH, Shigeo CHIBA1959 Volume 34 Issue 4 Pages 105-106
Published: 1959
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe haploid chromosomes numbering six were observed in a laboratory-reared female of the springtail, Tomocerus minutus Tullberg in the squash material with acetic dahlia.View full abstractDownload PDF (181K) -
Susumu TAKAYAMA1959 Volume 34 Issue 4 Pages 107-110
Published: 1959
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe chromosomes of Pipistrells tralatitus abramus, a species of the Vespertilionidae (Microchiroptera), was investigated in male germ-cells. The number of chromosomes was found to be 26 in diploid and 13 in haploid. The sex chromsomes are of the usual XY-type, consisting of a medium-sized subterminal X and a small rod-shaped Y.
This species is remarkable not only for the considerably low number of the chromosomes, but also for the complement which contains only two pairs of the telocentric elements. The chromosomal relation of this species to other vespertilioniid bats was discussed.View full abstractDownload PDF (1157K) -
Masanaka TERADA, Kenzo SHIBAZAKI1959 Volume 34 Issue 4 Pages 111-115
Published: 1959
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe present authors have extracted and purified RNA from acid-fast bact. Kedrowsky strain and have observed its morphology under the electronmicroscope. The diameter of elementary fibers showed a figure of 15-20 Å.View full abstractDownload PDF (776K) -
Dominance Relations in F1 Hybrids, with Special Reference to Flower Color and Anthocyanin Pigment ConstituentsToru ENDO1959 Volume 34 Issue 4 Pages 116-124
Published: 1959
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESS1. Chromosome numbers of Swiss Giant Pansy, Viola×Wittrockiana Gams were counted to be 2n=24 in the somatic tissues of seven varieties.
2. The seven varieties with different flower colors were crossed and approximate dominance relations were observed.
3. Anthocyanins present in flowers of parental varieities and their F1 hybrids were paper-chromatographically analysed. Every one of anthocyanin constituents found in the F1 hybrids corresponds on the chromatograms to one present in the parental varieties.
4. The genetic background responsible for the production of a major anthocyanin, aD2, is dominant over that of another major anthocyanin, C3.
5. Anthocyanins present in cyanic flowers reappear as a group in F1 hybrids between cyanic and acyanic varieties.
6. Some anthocyanins are quantitatively increased, decreased or inhibited in F1 hybrids among the cyanic varieties.View full abstractDownload PDF (1161K) -
Ittetsu IKOMA1959 Volume 34 Issue 4 Pages 125-134
Published: 1959
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSIn the course of a study of F elimination by acriflavine, a new mating type, Fi (i=intermediate), was induced in F+ strains of E. coli K-12.
Two types of F+ were found; one having a tendency to spontaneously liberate F- cells, the other preserving its F factor firmly. It was found that acriflavine was especially effective in inducing Fi and F- from the former type.
Fi is distinguished from F+ and F- by the fact that it can mate with both F+ and F-, but is more fertile than F+ in crosses with a standard F+. Furthermore, Fi behaves as a recipient to F+, and as a donor to F- in recombination processes.
The phenotypic components of an Fi population are not uniform, but are composed of F+ -like, Fi and F- cells. When the population is transferred serially in broth, it has a tendency to become either F+-like or F-, especially the latter, with gradual changes of its components.
From these facts, it was assumed that there might be an unstable condition, the Fi state, between F+ and F-.View full abstractDownload PDF (932K)
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