[Spectral sensitivity of photoreceptors of the compound eye of the locust]. / Spektral'naia chuvstvitel'nost' fotoretseptorov slozhnogo glaza saranchi.

Intracellular recordings have shown that there are three types of receptors in the retina of the locust with lambda max = 360, 430 and 530 nm. Their spectral sensitivity curves are considerably wider than the absorption curves of the corresponding pigments. On the basis of spectral sensitivity curves obtained and assuming that each receptor contains only one pigment, possible coefficients of electrical coupling between receptors with different spectral characteristics are calculated. They correspond to coefficients of electrical coupling obtained by Shaw and Lillywhite in the locust. Thus the observed broadening of spectral sensitivity curves as compared with the absorption curves of pigments may be caused by electrical coupling between receptors.

[Polarization and spectral sensitivity of individual house cricket photoreceptors]. / Poliarizatsionnaia i spektral'naia chuvstvitel'nost' odinochnykh fotoretseptorov domovogo sverchka.

Polarization and spectral sensitivities of single photoreceptors of a house-cricket were measured. Morphologically, the cricket rhabdom is a symmetric model in which the polarization sensitivity of a single photoreceptor is equal to the dichroic ratio of a single microvillus. The spectral sensitivity curves of all the photoreceptors measured (24 cells) appeared to be similar and showed the main peak of sensitivity at 500 nm and the secondary peak at 360 nm--the situation reminding properties of vertebrate rhodopsin. The polarization sensitivity measured was equal to 2.28 +/- 0.85 (mean for 70 cells +/- standard deviation). This value is in favour of small preferential orientation of the dipole moments of the pigment molecules along the microvillar axes.

[Identification of "slow" cells in insects eyes]. / Identifikatsiia "medlennykh" kletok glaza nasekomykh

Responses of "slow" cells of the compound eye of grasshopper to equal-energetic flashes of monochromatic light of different wavelengths were recorded by intracellular microelectrode. Majority of cells had the curve of spectral efficiency of 540 nm. This curve coincided practically with the curve of spectral efficiency measured with ERG. Colour adaptation significantly changed the curve of spectral efficiency of the "slow" cells. Intracellular staining of the "slow" cells of grasshopper, cricket and locusta by procion yellow M-4 or by sulphide of cobalt have shown that the "slow" cells are the cells of crystaline cone.