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Journal of Experimental Biology, Vol 64, Issue 1 131-140, Copyright © 1976 by Company of Biologists

JOURNAL ARTICLES

The action of the excretory apparatus of Calliphora vomitoria in handling injected sugar solution

G Knowles

Recent evidence suggests that the isolated Malpighian tubules of Calliphora possess mechanisms which restrict the loss of glucose and trehalose from the insect. This report establishes that the intact, diuresing fly does not excrete glucose or trehalose when solutions of these sugars are injected. When solutions of non-metabolized sugars such as sorbose and xylose are injected into the fly, these sugars are rapidly excreted. High concentrations of sorbose and xylose are found in the urine, suggesting that rapid reabsorption of fluid occurs in the excretory apparatus even during the diuresis which the injections provoke. However, injected sucrose is apparently not excreted in large amounts and it is possible that the Malpighian tubules when functioning in vivo are impermeable to disaccharides.
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© The Company of Biologists Ltd 1976