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dc.contributor.authorSparrow, A H
dc.contributor.authorHoward, Alma
dc.contributor.authorCowie, F G
dc.contributor.authorSchwemmer, S S
dc.contributor.authorNauman, A F
dc.date.accessioned2011-09-02T11:51:58Z
dc.date.available2011-09-02T11:51:58Z
dc.date.issued1975-04
dc.identifier.citationChromosomes and cellular radiosensitivity. IV. A new radiotaxon represented by the ferns. 1975, 27 (4):343-54 Int J Radiat Biol Relat Stud Phys Chem Meden
dc.identifier.issn0020-7616
dc.identifier.pmid1079797
dc.identifier.urihttp://hdl.handle.net/10541/141596
dc.description.abstractSurvival curves were constructed and D0 values determined after X-irradiation of single-celled germinating spores of 14 species of ferns, which had a wide variation in interphase chromosome and nuclear volumes and in DNA content per chromosome and per nucleus. A good fit to a line of slope equal to -1 is given on a log-log plot relating D0 to interphase chromosome volume. In a previous publication (Sparrow, Underbrink and Sparrow 1967), ferns fell into radiotaxon VIII, but the new data suggest that they should be assigned to a new group (VIIa) falling midway between radiotaxa VII and VIII. The calculated energy absorption per chromosome at D0 for VIIa is also intermediate between those for VII and VIII. If the value of this parameter is set at 1 for radiotaxon V, that for VIIa is approximately 32 times greater and the radiotaxa V, VI, VII and VIIa form a series 1 : 4 : 14 : 32. The new results indicate that radiotaxon VIII may have to be abandoned unless some other radiobiologically unexplored group (e.g. algae) fills the gap.
dc.language.isoenen
dc.subject.meshCell Survival
dc.subject.meshChromosomes
dc.subject.meshDose-Response Relationship, Radiation
dc.subject.meshMitosis
dc.subject.meshPlants
dc.subject.meshRadiation Genetics
dc.subject.meshSpores
dc.subject.meshX-Rays
dc.titleChromosomes and cellular radiosensitivity. IV. A new radiotaxon represented by the ferns.en
dc.typeArticleen
dc.contributor.departmentBiology department, Brookhaven National Laboratory, Upton, New York 11973, USAen
dc.identifier.journalInternational Journal of Radiation Biology and Related Studies in Physics, Chemistry, and Medicineen
html.description.abstractSurvival curves were constructed and D0 values determined after X-irradiation of single-celled germinating spores of 14 species of ferns, which had a wide variation in interphase chromosome and nuclear volumes and in DNA content per chromosome and per nucleus. A good fit to a line of slope equal to -1 is given on a log-log plot relating D0 to interphase chromosome volume. In a previous publication (Sparrow, Underbrink and Sparrow 1967), ferns fell into radiotaxon VIII, but the new data suggest that they should be assigned to a new group (VIIa) falling midway between radiotaxa VII and VIII. The calculated energy absorption per chromosome at D0 for VIIa is also intermediate between those for VII and VIII. If the value of this parameter is set at 1 for radiotaxon V, that for VIIa is approximately 32 times greater and the radiotaxa V, VI, VII and VIIa form a series 1 : 4 : 14 : 32. The new results indicate that radiotaxon VIII may have to be abandoned unless some other radiobiologically unexplored group (e.g. algae) fills the gap.


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