0 an oil-like substance produced by the sebaceous glands in the skin that makes hair shiny and prevents skin from becoming dry --
As the sebum was applied to the cloth, the electric grids were moved with treatments and thus any difference in the efficiency of the grids is confounded with treatments.
The effect of sebum was to attract more flies to the target rather than to induce a landing response in a higher proportion of attracted flies.
Treatments 1 and 3-had 200 ml of solvent applied to the target daily and treatments 2 and 4 had 200 ml of sebum solution applied daily.
Sebum collected in dichloromethane, and sebum collected in methanol were used in two successive experiments.
Testing of fractions of sebum revealed active component(s) in the phenolic and non-acidic fractions but not in the acidic fraction.
In the present experiments the sebum extract was crude and the concentrations (in host equivalence per unit time) was not measured.
The latter also causes the skin to become dry as sebum production reduces, therefore increasing the possibility of mechanical stress.
The effects of sebum or its fractions were thus tested as additions to this basic attractant.
