Gertrud Kolb

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In spontaneous-choice experiments on the butterflyPieris brassicae L. (Pieridae), spectral-effectiveness and spectral-sensitivity functions were obtained for various behaviors. Pilot experiments with colored PVC films, for which the relative number of reflected quanta with regard to the given illumination had been calculated, showed that the feeding(More)
1. Intracellular receptorpotentials were recorded with microelectrodes from single visual cells of the ventral part of eyes of imagines and from visual cells of nymphs of Aeschna cyanea and Aeschna mixta. They are monophasic depolarizing. Their amplitude and form depend on the light intensity (Fig. 2). 2. Curves showing potential amplitude as a function of(More)
1. Light and dark adaptation in single visual cells ofAeschna cyanea were examined by intracellular recording of the receptor potentials. A description of the characteristics of the receptor potential is given in Figs. 3 and 4. 2. A light stimulus of several seconds (light adaptation) is succeeded by an afterpotential of the receptor potential. In most(More)
The apposition eye of Aglais urticae is composed of eucone ommatidia. Serial sectioning of blocks from the laterofrontal and lateroventral eye regions and mapping at different levels revealed that there is no torsion of whole ommatidia along their long axes. The sensory part of the ommatidium comprises nine retinula cells. The most significant features of(More)
In spontaneous-choice experiments on the butterfliesAglais urticae L. (Nymphalidae) andPararge aegeria L. (Satyridae) the spectral effectiveness and spectral sensitivity of various behaviors were investigated and compared. Pilot experiments with colored PVC films showed indications of an intensity dependence of the feeding reaction inP. aegeria. Moreover,(More)
Comparative tests were carried out, using a radioactive tracer method, on the pharmacokinetics of sodium and methylglucamine diatrizoate. A biological model was simulated using an analogue computer; and the rate and elimination constants, the elimination half life, and the ratio of tissue entry to tissue elimination constants were calculated. Over the(More)
The compound eyes ofPieris brassicae L. have a tiered retina. During light and dark adaptation, ultrastructural changes have been observed throughout the length of the ommatidia in the latero-ventral region of the eyes. These changes have been quantitated by mapping at distinct levels of the ommatidia, and plotted as histograms. Both in visual cells and(More)
Spectral transmission was measured by means of a Zeiss Universalmicro-spectralphotometer between 550 and 300 nm on fixed (Carnoy) and also on fresh cornea and crystalline cones of single ommatidia of Aeschna cyanea Müll. (Odonata). Both crystalline cones and fresh corneas (in contrast to fixed corneas) have nearly constant transmission from 550 to 370 nm;(More)