Studies on the Digestion of Wool by Insects VIII. the Significance of Certain Excretory Products of the Clothes Moth, Tineola Bisselliella, and the Carpet Beetle, Att Agenus Piceus

Rf, Powning

doi:10.1071/bi9530109

Cited by 26 publications

(4 citation statements)

References 14 publications

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“…These structures have been shown by Kunert (13) to produce sulfite which possibly reduces the keratin disulfides by "sulfitolysis", exposing the keratin proteins to enzymatic attack. Reduction of disulfides prior to keratinolytic attack also has been observed in the digestion of wool by the clothes moth (Tineola bisselliella) larva (24,25).…”

Section: Discussionmentioning

confidence: 79%

Phosphate-Mediated Alteration of theMicrosporum gypseumGermination Protease Specificity for Substrate: Enhanced Keratinase Activity

Page

Stock

1974

J Bacteriol

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Inorganic phosphate was found to decrease the caseinolytic and ethyl-esterase activities of the Microsporum gypseum germination protease. The germination protease possessed exokeratinase (beta-keratinase) activity immediately after release from the fungal spore. After phosphate treatment of the enzyme, the germination protease also possessed endo-keratinase (alpha-keratinase) activity. Phosphate altered the protease's pH optimum from 9.0 to 7.0 and decreased the molecular weight from 33,000 to 16,000. These values were identical to those found for the keratinase. Alphaand beta-keratinase activities were stimulated in excess of 200-fold by disulfide reducing agents. Natural and suspected keratin degradation products also enhanced keratinase activity. Cell fractionation and in vitro conversion of the alkaline germination protease into a functional keratinase suggested that the subunits comprising the germination protease and the keratinase were of a common origin.

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Section: Discussionmentioning

confidence: 79%

Phosphate-Mediated Alteration of theMicrosporum gypseumGermination Protease Specificity for Substrate: Enhanced Keratinase Activity

Page

Stock

1974

J Bacteriol

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“…Faecal nitrogen and nitrogen used for growth account for only 85% of the nitrogen ingested by the larvae. The discrepancy seems most likely to be due to the loss of ammonia from the frass during drying (Powning, 1953;Pramila and Krishnamoorthy, 1977).…”

Section: The Nitrogen Budgetmentioning

confidence: 99%

The cause of reduced growth of Manduca sexta larvae on a low-water diet: Increased metabolic processing costs or nutrient limitation?

Martin

Hof

1988

Journal of Insect Physiology

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Relative growth rates and nitrogen accumulation rates are lower for third-instar ~Uanduca sexta larvae on an artificial diet containing 65% water than on one containing 82% water, due to reduced efficiencies of conversion of digested food and digested nitrogen into larval biomass. Uric acid production is 2.@-2.5fold greater, and non-feeding respiration rates 16.0% higher in the larvae on the low-water diet. Food is the major source of water for the larvae, with metabolic water making only a minor contribution to water input. Faecal excretion is the major avenue of water loss, although a significant amount of water is also lost by transpiration. Larvae from the low-water diet retain and use a higher percentage of the water they gain than larvae from the high-water diet (49.4% vs 41.9%). They produce much drier faeces (48.1% water vs 77.3% water), and, because their tissues are less hydrated (81.3% water vs 88.1% water), they synthesize 70% more new, fully hydrated tissue from a given amount of water than larvae from the high-water diet. We discuss problems involved in the use of determinations of efficiency of conversion of digested food in establishing causal links between diet, growth, and metabolic maintenance costs, and also offer a definition of food processing costs that distinguishes them from metabolic costs attributable to other processes, such as food acquisition, growth, and moulting. We conclude that reduced growth and reduced efficiency of conversion of digested food on low-water diets are due to limitation in the amount of water available for the synthesis of new hydrated tissue, and not to the imposition of higher food processing costs.

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“…(Hollande & Cordebard, 1926). More recently, a careful analysis of the constituents of the excreta has been made by Powning (1953). The percentages (dry wt.…”

Section: Distribution Cosmopolitanmentioning

confidence: 99%

The Larvae of the Species of Tineidae of Economic Importance

Hinton

1956

Bull. Entomol. Res.

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Keys are provided for the larvae of 32 species of TINEIDAE, and detailed descriptions are given of 31 species. These include most of the species known to be of any economic importance. What is known of the biology of each is briefly summarised, but no attempt has been made to collate the available information on control measures.No larvae have been available of four species of some economic importance nor of twelve others of doubtful status as pests. The literature on each of these species is noted.The larvae of a few species of no known economic importance are described and are included in the keys. Most of these are very closely related to species known to be pests.The keys and descriptions include 21 species which are indigenous to Britain or are established here, so that keys and descriptions are now provided for half of the British species ofTineidae.

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Studies on the Digestion of Wool by Insects VIII. the Significance of Certain Excretory Products of the Clothes Moth, Tineola Bisselliella, and the Carpet Beetle, Att Agenus Piceus

Cited by 26 publications

References 14 publications

Phosphate-Mediated Alteration of theMicrosporum gypseumGermination Protease Specificity for Substrate: Enhanced Keratinase Activity

Phosphate-Mediated Alteration of theMicrosporum gypseumGermination Protease Specificity for Substrate: Enhanced Keratinase Activity

The cause of reduced growth of Manduca sexta larvae on a low-water diet: Increased metabolic processing costs or nutrient limitation?

The Larvae of the Species of Tineidae of Economic Importance

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