title: Change with age of Feulgen-DNA values in the blood-sucking insect, Triatoma infestans Klug.
abstract: Feulgen-DNA values were evaluated cytophotometrically in the Malpighian tubes of T. infestans at the nymphal, adult and ageing life periods. In all cases the total nuclear Feulgen-DNA contents were found to be distributed within the 32C and 64C classes. However, part of the Feulgen-DNA values is shifted to lower intervals in ageing insects, as compared with nymphal and adult individuals, promoted by decrease in Feulgen-DNA values of the euchromatins. Changed response to Feulgen reaction due to some aging-induced alteration in DNP complexes, and/or breaks and loss of DNA in the euchromatins, as part of the senescence process, are ascribed to be responsible for such phenomenon.
mesh_terms: D000375:Aging; D000818:Animals; D002843:Chromatin / Q000378:metabolism; D004247:DNA / Q000032:analysis / Q000378:metabolism*; D006570:Heterochromatin / Q000378:metabolism; D008297:Male; D008317:Malpighian Tubules / Q000378:metabolism; D009758:Nymph / Q000378:metabolism; D014224:Triatoma / Q000378:metabolism*; D014225:Triatominae / Q000378:metabolism*
chemical_list: D002843:Chromatin; D006570:Heterochromatin; D004247:DNA