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- W2012606300 abstract "A summary of the results obtained that differ most from others published is as follows: A spireme originates from material derived from both nucleolus and nuclear network. The materials constituting this spireme are aggregations varying in appearance, in number, and in staining capacities. These aggregations are not the chromosomes. They greatly exceed in number that published for chromosomes in any species of Spirogyra; although a comparative study of plates of other investigators indicates that these are the bodies heretofore designated as chromosomes. This spireme in the pachyneme stage is composed of deeply stained short filaments intermixed with material of a granular nature. There is evidence that this granular material was derived from the nucleolus, the filamentous from the nuclear network. These two materials amalgamate to form one of intensive staining capacity. The amalgamated material retains the spireme form. This spireme as a whole is spherical, later elongates, becoming cylindrical. Cross-sections of the loops reveal their tubular structure. This spireme does not appear to split either transversely or longitudinally, but separates at various points as would a viscid mass if pulled in opposite directions. Fourteen or more tubular chromosomes for each daughter nucleus result from the elongation of the coils of the spireme. These are not to be considered pseudo chromosomes. At this stage and subsequently chromidia are discharged into the cytoplasm. It is probable that these chromidia are concerned in the development of pyrenoids. There is no evidence throughout the karyokinesis of an equational division of autonomous bodies. The advantage of this form of division over direct divisions appears to lie in. the opportunity for escape of the chromidia from the nucleus. Spirogyra crassa does not in the behavior of its nucleus in karyokinesis present a unique case, for the stages can be homologized with similar stages in Allium, as typical of the higher plants." @default.
- W2012606300 created "2016-06-24" @default.
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- W2012606300 date "1913-10-01" @default.
- W2012606300 modified "2023-09-24" @default.
- W2012606300 title "Nuclear Division in Spirogyra crassa" @default.
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- W2012606300 doi "https://doi.org/10.1086/331169" @default.
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