TL;DR: While high expression of specific serine proteases appears linked to keratin digestion in both species, it remains to be established if their action requires additional enzymatic or physiological functions to initiate the degradation of the abundant cysteine bonds of keratins.
TL;DR: The excreta of clothes moth larvae (Tineola) bred on a· standard undyed woollen fabric, the black carpet beetle (Attagenus) living on wool, and the potato moth feeding on potato tubers, have been examined.
Abstract: The excreta of clothes moth larvae (Tineola) bred on a· standard undyed woollen fabric, the black carpet beetle (Attagenus) living on wool, and the potato moth (Gnorimoschema) feeding on potato tubers, have been examined. Water-soluble nitrogen constitutes most of the total nitrogen in both Tineola and Attagenus excreta. The fraction of this water-soluble nitrogen ontributed by uric acid or its salts is high in Tineola, but considerably lower in Attagenus. Up to 3 per cent. urea and an appreciable quantity of ammonia are also present.
TL;DR: The clothes moth enzyme can be considered as having distinct keratinolytic activity, but the amount of wool digestion observed in the absence of reducing agents does not account for all of the digestion which occurs in the insect.
TL;DR: The pH and oxidation-reduction potential of the contents of the alimentary canal of Tineola larvae were determined by adding suitable indicators to their food.
Abstract: The pH and oxidation-reduction potential of the contents of the alimentary canal of Tineola larvae were determined by adding suitable indicators to their food.
TL;DR: A study of the tracheation of nine tissues and organs of five species of insects reveals that the arrangement of trachae and especially of tracheoles is determined by the structure of the tissue supplied.
Abstract: A study of the tracheation of nine tissues and organs of five species of insects reveals that the arrangement of tracheae and especially of tracheoles is determined by the structure of the tissue supplied. Adaptations are found in the ovary permitting the supply of the oocyte during its rapid enlargement. There is a correlation between the abundance of the tracheal supply of a tissue and its probable oxygen requirements.