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- W2016593723 abstract "A chemical present in faeces, haemolymph, and whole bodies of larvae of Heliothis virescens stimulates females of the tachinid Archytas marmoratus to deposit maggots in the vicinity of the host. The larvipositional stimulant is soluble in water and in 0·1 N HCl and 0·1 N acetic acid and is insoluble in apolar solvents. Considerable activity is present in 0·1 N HCl extracts of acetone powders of whole H. virescens larvae. Larvipositional activity is destroyed by alkaline solutions. The activity of acidic extracts is greater than that of aqueous extracts when extracts are stored at 2°C for several days; however, extraction of the larvipositional stimulant is not necessarily more efficient with acidic extracts because there is no difference in the activity of the residues remaining after water and acid extraction. Thus, low pH appears to retard the decomposition of the larvipositional stimulant. Gel filtration, chromatography, and membrane filtration demonstrated that the compound has a molecular weight of 30,000 ± 5000. Rapid loss of activity during incubation with a proteinase (pepsin) indicates that the chemical is a protein. Larvipositional activity is present in larvae, pupae, pharate adults, and newly emerged adults of H. virescens. Most species of noctuids tested are highly active, and some activity is present in pyralid larvae. Very little or no activity is present in larvae of the beetle, Anthonomus grandis, or in Apis mellifera." @default.
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- W2016593723 date "1975-05-01" @default.
- W2016593723 modified "2023-09-27" @default.
- W2016593723 title "A substance from Heliothis virescens larvae stimulating larviposition by females of the tachinid, Archytas marmoratus" @default.
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- W2016593723 doi "https://doi.org/10.1016/0022-1910(75)90108-0" @default.
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