Abstract
1. 1. The amount of deoxyribonucleic acid was determined in the heart and the associated tissues of adult Musca domestica L. 2. 2. The DNA analyses were performed by a microbiological method using Lactobacillus acidophilus ATCC 11506 and by the Burton modification of the Dische diphenylamine reaction. 3. 3. The average amount of DNA was found to be 0·367 μg/100 μg fresh tissues in the males, and 0·384 μg/100 μg fresh tissue in the females. These values were also expressed on a per heart and dry weight basis. 4. 4. The quantity of DNA in the hearts of the males and females of the same age group or of different age groups is similar. 5. 5. If DNA is considered an index to cell number, the cell number remains approximately constant for insects of different ages regardless of sex.
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