نتایج جستجو برای: feeding deterrents
تعداد نتایج: 111125 فیلتر نتایج به سال:
The screening of several Chinese medicinal herbs for insecticidal principles showed that Euphorbia fischeriana roots possessed significant feeding deterrent activity against two stored-product insects (Tribolium castaneum and Sitophilus zeamais). From ethanol extract, four feeding deterrents were isolated by bioassay-guided fractionation. The compounds were identified as jolkinolide B, 12-deoxy...
Feeding deterrents or antifeedant chemicals are those chemicals which inhibit feeding of insect on a treated food material without necessarily killing or repelling them. Plants with ant feeding properties are increasingly being used against phytophagous insect pests for protection of crops. In the present study of growth regulating action of Leaf extract of Catharanthus roseus on development st...
In this study, we show that female African malaria mosquitoes Anopheles gambiae starved for 3-5 h start to engorge on sucrose at concentrations between 50 and 75 mmol l(-1). Half of the feeding response (ED50) is reached at 111 mmol l(-1) and the maximum response (0.4 mg) occurs at 250 mmol l(-1). Two receptor cells in a trichoid sensillum of the labellum, called the 'sucrose' and 'water' neuro...
CONTEXT Despite the growing number of homeless women of reproductive age, little is known about their reproductive health and contraceptive use. METHODS A representative sample of 974 currently homeless women surveyed in Los Angeles County in 1997 included 229 who were chronically homeless and at risk for unintended pregnancy. The relationships between perceived deterrents among these women a...
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