Effect of fast electrons with different energy spectra on two DNA fractions of meristematic cells

Journal Article · Mon Jan 01 04:00:00 EST 1973 · Biophysik, v. 10, no. 2, pp. 157-162

OSTI ID:4395618

Elmshaeuser, H J; Markus, B

In previous observations of the frequency of chromosome aberrations in anaphase meristem cells of Allium cepa irradiated with fast electrons in different depths the varying radiosensitivity in different stages of the cell cycle could be interpreted by assuming a different effect in euchromatin and heterochromatin synthesized at differcnt times. In the experiments described two DNA fractions of different molecular weight extracted from the same object and from Vicia faba and defined as euchromatin and heterochrondatin by the uptake of / sup 3H-actinomycin D have been irradiated under the same conditions. The change in UV absorption after surface and depth irradiation was different for the two chromatin fractions and can be explained in accordance with the chromosome aberrations by repair of euchromatin, but not of heterochromatin, 9 h after irradiation. (auth)

• Research Organization: Univ., Goettingen, Ger.
• NSA Number: NSA-29-000611
• OSTI ID: 4395618
• Journal Information: Biophysik, v. 10, no. 2, pp. 157-162, Journal Name: Biophysik, v. 10, no. 2, pp. 157-162; ISSN BPYKA
• Country of Publication: Country unknown/Code not available
• Language: German

Related Subjects

*CHROMATIN-- RADIOSENSITIVITY
*DNA-- BIOLOGICAL RADIATION EFFECTS
ALLIUM CEPA
CELL CYCLE
CHROMOSOMAL ABERRATIONS
ELECTRONS
GENETIC VARIABILITY
IRRADIATION
MERISTEMS
MOLECULAR WEIGHT
N48410* --Life Sciences--Radiation Effects on Plants--Basic Studies
PLANT CELLS
RADIOINDUCTION
RESPONSE MODIFYING FACTORS
VICIA