PENETRATION OF SUGARS FROM THE CHEMOSENSORY HAIR TIP IN THE FLESHFLY

(1) The penetrations of ¹⁴C-D-glucose and 3-O-methyl-¹⁴C-D-glucoseinto the isolated head of the fleshfly, Boettcherisca peregrina,from the tip of the longest chemosensory hair on the labrumwere investigated. (2) Both ¹⁴C-D-glucose and 3-O-methyl-¹⁴C-D-glucosepenetrated into the hair almost linearly with time and movedrapidly into the labrum. The isotopic activity was finally detectedin the head. (3) The isotopic activity of the hair dipped into¹⁴C-D-glucose solution increased in the preparation which hadbeen pretreated with 7.5 x 10^–2M colchicine for 30 min,whereas in the case of 3-O-methyl-¹⁴C-D-glucose no effect by7.5 x 10^–2M colchicine was found. (4) Both ¹⁴C-D-glucoseand 3-O-methyl-l4C-D-glucose which penetrated from the poreof the hair tip were detected in the dendritefree lumen andin the dendrite-containing lumen of the chemosensory hair. (5)These results suggest that D-glucose not only moves in the dendrite-freelumen and the dendrite-containing lumen but also in the dendrite(s).The suggestive results that 3-O-methyl-D-glucose moves in thedendrite(s) could not be obtained. ^*Present address: Department of Physiology, Medical Collegeof Miyazaki, Miyazaki, Japan.