CYTOLOGIA
Online ISSN : 1348-7019
Print ISSN : 0011-4545
Volume 5, Issue 3
Displaying 1-14 of 14 articles from this issue
  • André Eichhorn
    1934 Volume 5 Issue 3 Pages 253-268
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
    JOURNAL FREE ACCESS
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  • C. Leonard Huskins, Jane D. Spier
    1934 Volume 5 Issue 3 Pages 269-277
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
    JOURNAL FREE ACCESS
    A heteromorphic bivalent, having one terminally and one medianly attached chromosome, always segregates reductionally in the first meiotic division.
    Two heteromorphic bivalents, with sub-median attachments an each chromosome sometimes separate equationally in the first division.
    The spindle attachment is shown to remain unchanged, and the possibility that non-sister chromatids may be associated at the spindle attachment is not in accord with these observations. The hypothesis that sister chromatids are associated at the spindle attachment and that equational first divisions are due to crossing over is in full accord with the observations.
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  • L. M. Humphrey
    1934 Volume 5 Issue 3 Pages 278-300_1
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
    JOURNAL FREE ACCESS
    1. The tomato polyploid series, haploid, diploid, and tetraploid has been described with special reference to the prophase of microsporogenesis.
    2. The resting nucleus of the haploid contains prochromosomes. There is no pairing of threads and the spireme in prophase is not continuous. Metaphase-anaphase distribution is random. Second metaphase is regular except that three spindles are sometimes present. Normal spores occasionally result from non-reduction at first division. Hexads are occasionally found.
    3. The diploid produced by the decapitation method, is completely homozygous, and the meiotic behavior is entirely regular.
    4. The tetraploid, also produced by the decapitation method, is likewise homozygous. Four strand pairing occurs at synapsis. At diplotene the chromosomes usually appear as tetrasomes, but become separated into disomes at diakinesis and metaphase. Disjunction is regular and subsequent behavior is normal and similar to that of the diploid. Tetrads always appear normal.
    5. Measurements were made an the diameters of pollen, pollen mother cell, nucleus and nucleolus as well as tetrad, microspore and microspore nucleus, and these were compared in the, different individuals. A definite increase in size was noted in each Gase when the chromossme number was doubled.
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  • P. F. Milovidov
    1934 Volume 5 Issue 3 Pages 301-304
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
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  • Yoshito Yamasaki
    1934 Volume 5 Issue 3 Pages 305-307
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
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  • H. Pfeiffer
    1934 Volume 5 Issue 3 Pages 308-316
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
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    Ältere Abwasch- und Strömungsverfahren von W. BARIKINE und WALLACE O. FENN sind durch Bestimmung einer vergleichenden Haft zahl der nackten Protoplasten (des 100-fachen Quotienten der nach Abspülen haftenden und der vorher vorhandenen Objekte) verfeinert worden. Bei der Anwendung auf verschiedene Stadien der Plasmorrhyse und auf wechselnde plasmorrhysierende Medien ergeben sich außer einer Abnahme des Adhärierens mit dem Plasmorrhysegrade “lyotrope” Beziehungen zu der Natur des Anions und Kations des benutzten Salzes.
    Weiter sind die älteren Methoden unter Zusammenstellung einer besonderen Durchströmungsapparatur modifiziert worden, um den Abgleitwid erstand adhärierender Objekte gegen Flüssigkeitströmungen bestimmter Bewegungsenergie in absolutem Maß auszudrücken. Zwar wird bei Anwendung auf Salzlösungen wechselnder Zusammensetzung und Concentration der Abgleitwiderstand als proportionaler Anteil des komplexen Adhäsionsphänomens erkannt, aber die vorgenommene Komplizierung stellt aus mancherlei Gründen keine Verbesserung dar.
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  • Hetero- und Euploidie bei Rumex acetosa L
    Yukio Yamamoto
    1934 Volume 5 Issue 3 Pages 317-336
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
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  • Spironema fragrans
    Margaret Richardson
    1934 Volume 5 Issue 3 Pages 337-354
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
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    1. The frequency and behaviour of chiasmata is quantitatively analysed in Spironema fragrans from early diakinesis to metaphase for different kinds of bivalents whose somatic chromosome morphology is known.
    2. The behaviour of chiasmata is followed throughout successive stages in the two arms of one kind of bivalent.
    3. There is no change in the mean number of chiasmata in the different bivalents from diakinesis to metaphase. Terminalisation is incomplete.
    4. The frequency variation of chiasmata in the different bivalents shows the presence of interference.
    5. The relation between chromosome length and the mean number of chiasmata per bivalent is very closely directly proportional.
    6. Terminalisation proceeds at a different rate in the different kinds of bivalents.
    7. The number of terminal chiasmata is increasingly greater in bivalents with, 1, 2, 3, and 4 chiasmata in each dass of bivalent.
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  • Osamu Minouchi, Takeo Ohta
    1934 Volume 5 Issue 3 Pages 355-362
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
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  • Kyojiro Shimakura
    1934 Volume 5 Issue 3 Pages 363-372_1
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
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    (1) The tonicity of the metaphase I cell of Tradescantia virginiana L. was approximately determined by plasmolysis, using balanced salt solutions.
    (2) The influence of the cH of the surrounding medium upon the distinctness of the chromosomes in the cell was investigated by using a series of approximately isotonic balanced solutions with varying cH. The cH of the natural medium of the cell, i.e., the pollen-sack slime, seems to be the most favourable one for the presumably normal appearance of the chromosomes.
    (3) The chromosomes are quite distinctly visible in the cells immersed in the presumably isotonic solution of saccharose, though the cells are slightly plasmolyzed due to a peculiar effect of saccharose solution an the plasma-membrane of the cell. These cells are capable of continuing divisions under the microscope.
    (4) The tonicity of the cell appears to rise considerably as the stage of division proceeds.
    (5) The presence of the pollen-sack slime is necessary for the completion of cell-wall formation.
    The writer wishes here to express his hearty thanks to Professor SAKAMURA for his kindness in furnishing ample material and in bestowing valuable criticism and suggestion during the course of this work. Further the writer is greatly indebted to Professor INUKAT for his kind helps and advice during the preparation of manuscript.
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  • Dontcho Kostoff
    1934 Volume 5 Issue 3 Pages 373-377
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
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  • J. F. McClendon
    1934 Volume 5 Issue 3 Pages 378-383
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
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  • Otto L. Mohr, Reidar Eker
    1934 Volume 5 Issue 3 Pages 384-390
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
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  • M. Demerec, G. A. Lebedeff
    1934 Volume 5 Issue 3 Pages 391-394
    Published: June 15, 1934
    Released on J-STAGE: March 19, 2009
    JOURNAL FREE ACCESS
    Virgin females heterozygous for, several sex-linked genes were subjected to X-ray treatment to increase the occurrence of primary non-disjunctional females. The percentage of homozygosis among these females for loci tested was as follows: sc (3.0) 26.7, c (23.5) 31.1, mt (68.5) 37.8, s (90.5) 22.2, sb (109.7) 28.9, ap (114.7) 26.3, rg (132.0) 17.7, bb (146) 4.2. The decrease of homozygosis toward the bobbed end of the chromosome indicates that the spindle-fiber attachment is located at that end.
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