... as on olfactory learning in preforaging honeybee workers of different ages. Adults were reared in the laboratory or in the hive. Immediately after being injected with insulin or vehicle (control), and focusing on the proboscis extension response, bees were tested for their spontaneous response to odours, sucrose...

... nectarivore in South Africa. When offered pairwise choices of equicaloric hexose and sucrose solutions, village weavers preferred hexose solutions at 5% and 10% sucrose equivalents (SE) but did not show significant preference for either type of sugar when higher concentrations were offered (15%, 20% and 25...

... of potentially toxic ethanol, [EtOH], in fleshy fruit increases during ripening and affects food choices by Egyptian fruit bats, becoming deterrent at high concentrations (⩾1%). However, ethanol toxicity is apparently reduced when ingested along with some sugars; more with fructose than with sucrose or glucose...

... pisum that define the upper and lower limits to the range of dietary sucrose concentrations utilised by this insect were determined principally using chemically defined diets containing 0.125–1.5 mol l –1 sucrose. On the diets with 0.125 mol l –1 and 1.5 mol l –1 sucrose, the aphids died as larvae...

... of the aphids were iso-osmotic, and their osmotic pressure was significantly lower in untreated aphids (0.91–0.95 MPa) than in antibiotic-treated aphids (1.01–1.05 MPa) ( P <0.05). For insects reared on chemically defined diets containing 0.15–1.0 mol l −1 sucrose (osmotic pressure 1.1–4.0 MPa), the osmotic...

... that the neuropeptide leucokinin-VIII (LK-VIII) increases the chloride permeability of the paracellular pathway. To test the effect of LK-VIII on the paracellular pathway further, we measured transepithelial permeabilities of inulin and sucrose in isolated Malpighian tubules from the mosquito Aedes aegypti . Cell...

...J. D. Rhodes; P. C. Croghan; A. F. G. Dixon ABSTRACT Ingestion, excretion and respiration in aphids were studied using artificial diets labelled with radioactive sucrose or amino acids. The rate of ingestion of a 25 % w/v sucrose diet was 12.4 nl mg –1 h –1 and the honeydew excretion rate was 5.3...

... and electrogenic absorption mechanisms for Na + and Cl − that can be measured as positive and negative short-circuit currents, respectively, in the absence of the counter ion. Increasing the osmolarity of the haemolymph-side saline by addition of sucrose resulted in a marked decrease in active uptake of both Na...