[Tectal Evoked Potentials during Retinal Baclofen Application in the Carp].

Changes of primary visual center evoked potentials in response to white light and optic nerve electric stimulation were investigated during retinal GABAb-receptors activation with baclofen in dark-adapted carp. It was found, that baclofen - induced b-wave ERG decreasing, was accompanied by a significant amplitude growing as in the evoked potential to light as in the evoked potential to electric nerve stimulation: It is proposed, that light evoked potential changes reflect the increasing of the third retinal neuron responses to light and/or tectal neuron responsiveness enhancement.

[Comparative study of the rod and cone contributions to the generation of b-wave ERG and tectal evoked potential in the dark-adapted carp].

Amplitudes and peak latencies as functions of wave length and monochromatic light intensity were investigated for b-wave ERG and tectal evoked potentials (EP) in the dark-adapted carp (Cyprinus carpio L). It was found, that independently of light intensity b-wave action spectra had one maximum in the medium wave band, corresponding to rod sensitivity area. For tectal EP, similar action spectra with maximum in the middle-wave were seen at low light intensity only.

[The determination of the specific sensitization of the peripheral blood leukocytes in pulmonary tuberculosis patients].

The results of testing blood specimens from patients with pulmonary tuberculosis with the method of diagnosing specific sensitization of leukocytes according to V. A. Fradkin and the method modified by the author are compared.

[Effect of baclofen and muscimol on the evoked potentials of the tectum mesencephali in the carp in response to stimulation of the visual and somatosensory afferent inputs].

The perfusion of (+/-) 10(-5) M baclofen to the optic tectum of the carp greatly reduced evoked potential to the optic nerve stimulation and slightly inhibited evoked potential to the spinal cord stimulation. The perfusion of 10(-4) M muscimol reduced the former evoked potential as well as the latter one. The results permit supposing that tectal visual input is more sensitive to the presynaptic inhibitory influences through GABAB-receptors than the somatosensory afferent input.

[Early positive component of the evoked potential of the midbrain tectum of the dogfish shark during electric stimulation of the optic nerve].

Midbrain tectal evoked responses to electric stimulation of the optic nerve were investigated in shark (Squalus acanthias). An early positive component was found as a part of negative phase of "classic" negative-positive evoked potential. Similar component was recorded from the ipsilateral tectal hemisphere as well.