ISSN:
1432-0878
Keywords:
Interphase nuclei
;
Ultracentrifugation
;
Fine structure
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary Ultracentrifugation of living cells from the liver of the mouse, rat, dog, frog, Necturus, follicle cells, of grasshopper testis, and meristem of the onion root tip shows evidence that the interphase chromatin is attached to the nuclear envelope. Because of its relatively high density, the bulk of the interphase chromatin, and often the nucleoli, are displaced to the centrifugal side of the nucleus and, when this occurs, the chromatin bodies attached to the centripetal side of the nucleus are drawn out into long filaments which extend across the nucleus centrifugally. They generally break before becoming detached from the envelope. Onion root tip chromosomes in early prophase also appear to be attached to the nuclear envelope. The Barr body strongly adheres to the nuclear envelope as evidenced by the high centrifugal force necessary to displace it. Nucleoli of ultracentrifuged meristematic cells of the onion root show evidence of a stratification of materials within them.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00336521
