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. 1976 May;126(2):903-6.
doi: 10.1128/jb.126.2.903-906.1976.

Determination of the execution points of mutations in the nuclear replication cycle of Aspergillus nidulans

E Orr, R F Rosenberger

Determination of the execution points of mutations in the nuclear replication cycle of Aspergillus nidulans

E Orr et al. J Bacteriol. 1976 May.

Abstract

Cultures of nuclear replication cycle mutants of Aspergillus nidulans were transferred to the nonpermissive temperature, and the fraction of nuclei still able to reach mitosis was determined. For the determinations, benomyl [methyl-1(butylcarbomoyl)benzimidazolecarbamate] was added to trap nuclei in mitosis, and these were detected by staining with aceto-orcein. The assumptions and controls required to relate the experimentally determined fractions to the points where a mutation blocks the nuclear cycle are discussed. Nine genetically distinct mutants were tested. Two of these were blocked early in the cycle, two in the middle, and five close to, or during, mitosis.

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