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Electron microscope studies of chromatin subunit particles


Kent, Diane Jacalyn (1975) Electron microscope studies of chromatin subunit particles. Master's thesis, California Institute of Technology. doi:10.7907/GVT9-N257.


Nuclease resistant chromatin subunits (ν bodies) were isolated from rat liver chromatin after digestion with DNAase II. Electron microscope studies showed them to be similar in size to particles which have been isolated from calf thymus chromatin and also to those seen in native chromatin. ν bodies prepared from native chromatin (ν(+F1) and histone F1-depleted chromatin (ν(-F1)), as well as formaldehyde-fixed products from both these digestions (ν(FF + F1) and ν(FF-F1) were similar in size. For ν(+F1) the diameter was 80 ± 17 Å (n = 125); for ν(-F1), 87 ± 19 Å (n = 100); for ν(FF + F1), 96 ± 23 Å (n = 50); and for ν(FF – F1) 81 ± 13 Å (n = 85). Multimer ν-body fractions did not show any obvious dimers, trimers, etc. , of monomer ν bodies. Sheared, isolated chromatin from rat liver was also examined using electron microscopy and was observed as networks of long thin strands (about 15 Å wide), interspersed with regions of either coiled single strands or strands covered with protein.

Item Type:Thesis (Master's thesis)
Subject Keywords:Chemistry
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Stroud, Robert M.
Thesis Committee:
  • Unknown, Unknown
Defense Date:27 March 1975
Record Number:CaltechTHESIS:04202010-093957061
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5723
Deposited By: Tony Diaz
Deposited On:17 Jun 2010 18:44
Last Modified:21 Dec 2019 01:24

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