Abstract
Receptor lymph was collected from labellar taste hairs of the fly Protophormia terraenovae. The concentration of some elements was determined in dried specimens by (energy- and wavelength-dispersive) electronprobe X-ray microanalysis. In the native fluid receptor lymph, the volume fraction of the dry matter was 4%. Assuming a density of 1.4 g/cm 3 the following concentrations were calculated for the native receptor lymph (mean ± standard deviation in mM/l): potassium (K +) 86 ± 46; sodium (Na +) 26 ± 18; calcium (Ca 2+) 2.8 ± 1.1; chlorine (Cl −) 6.0 ± 3.4; phosphorus (P) 15 ± 10; sulfur (S) 17 ± 11. Magnesium (Mg 2+) was below the detection limit in all specimens. A surplus of positively charged inorganic ions indicates an organic matrix with anionic sites.
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