ISSN:
1550-7408
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
SUMMARY. The division cycle was followed in four strains of Blepharisma undulans. Animals were fixed and stained at regular intervals from the end of one division through completion of the next.A comparative study of the present findings and those in the literature shows that in all strains in which the macronucleus is nodulated there is a similarity in the events that occur during division. These include a loss of some of the chromatin material, a fusion of macronuclear nodes into two masses, and a subsequent fusion of these two masses into one large, centrally located mass. This, in turn, elongates and divides into two daughter nuclei which either are nodulated at the time of separation or become so shortly after the division into daughter nuclei.Great variation exists, among different strains, in the number of macronuclear nodes present. This fact, coupled with knowledge of nuclear morphogenesis during the division cycle, renders macronuclear form of little taxonomic value at infrageneric levels.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1550-7408.1957.tb02501.x
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