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- W2024393888 abstract "Honeydew of Brevicoryne brassicae feeding on swedes was a faintly acid solution (pH 5·1–7·4) containing approximately 11 per cent dry matter, mostly carbohydrate in nature (88 per cent carbohydrate, 7 per cent nitrogenous compounds). Reducing sugars (fructose and glucose) comprised 27 per cent of the total carbohydrate. Acid hydrolysis of the non-reducing sugars yielded mainly glucose and a little fructose. Free amino acids and amides (in more or less equal amounts) accounted for 72–90 per cent of the total-N. Glutamine was the major constituent while glutamic and aspartic acids and two unknown ninhydrin-reacting compounds “under glutamine” also occurred in moderately large amounts. Smaller quantities of seventeen other amino acids were also present. All the amino acids and amides found in the honeydew also occurred in soluble form in the swede leaf in similar proportions. Nitrates accounted for 5 per cent of the total-N and ammonia appeared in trace amounts. All but 5–8 per cent of the total-N could be accounted for. Uric acid, urea, allantoin, allantoic acid, creatine, or creatinine could not be detected. Limits of detection : uric acid 1 per cent, urea 212 per cent of total-N. Citric acid was the major organic acid but malic, succinic, and fumaric acids occurred in smaller amounts. Chlorides and phosphates were present, 2·8 per cent of the dry matter being phosphorus (expressed as P2O5). The N/P ratio of the honeydew (0·71) was considerably lower than that of the soluble fraction of the swede leaf (3·4) or of whole alate B. brassicae (8·2). The only classical form of “excretory nitrogen” found was ammonia which comprised less than 0·5 per cent of the total nitrogen. It is hypothesized that ammonia may be detoxified in the mycetome by symbiotic organisms which utilize it preferentially as a nitrogenous substrate." @default.
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- W2024393888 date "1959-02-01" @default.
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- W2024393888 title "Composition of the honeydew of the aphid Brevicoryne brassicae (L.) feeding on swedes (Brassica napobrassica DC.)" @default.
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- W2024393888 doi "https://doi.org/10.1016/0022-1910(59)90054-x" @default.
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