WorldCat Identities

Hamdorf, K.

Overview
Works: 5 works in 6 publications in 3 languages and 49 library holdings
Genres: Laboratory manuals 
Roles: Author
Publication Timeline
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Most widely held works by K Hamdorf
Praktikum der Zoophysiologie by Carl Schlieper( Book )

2 editions published in 1977 in German and held by 4 WorldCat member libraries worldwide

Properties of pupil mechanisms in owl-fly Ascalaphus macaronius (Neuroptera) by Peter Stušek( )

1 edition published in 1999 in English and held by 1 WorldCat member library worldwide

Regulation of light Hux by pupil mechanisms in the UV-sensitive superposition eye of owl-fly Ascalaphus macaronius (Neuroptera) was studied with a fast reflection microspectrophotometric technique. The spectral sensitivity of pupil reaction, which was calculated on the basis of changes of transient amplitude reftection, was almost identical with the one of Deilephila eye. This indicates that in spite of different life styles and spectral sensitivities of photoreceptors pupil closing is triggered by the same photosensitive structure in both eyes. By measuring the spectra of reftected light from the Ascalaphus eye between 400 and 700 nm after different dark periods following light stimulation, it was established that the restoration of reflection was much faster in the red than in the blue spectral range. Based on this, we propose that two different pupil mechanisms with different spectral absorption characteristics are involved in light-Hux regulation. Fast-reacting pupil is probably represented by screening pigment migration in the secondary pigment cells and a slow blue-absorbing system by the activity in primary pigment cells. The importance of two different pupils for the photoregeneration of visual pigment is discussed
Photoregeneration and sensitivity control in UV-photoreceptors = Photoregeneration und Bereichseinstollung der Empfindlichkeit heim UV=Rezeptot by K Hamdorf( Book )

1 edition published in 1981 in English and held by 1 WorldCat member library worldwide

Fotorecepcija by Peter Stušek( Book )

1 edition published in 1987 in Slovenian and held by 1 WorldCat member library worldwide

Comparative physiology and evolution of vision in invertebrates by Hansjochem Autrum( )

1 edition published in 1979 in English and held by 0 WorldCat member libraries worldwide

In the comparative physiology of photoreception by the Protista and the invertebrates two aspects are emphasized: (1) the diversity of visual processes in these groups and (2) their bearing upon general mechanisms of photoreception. Invertebrates have evolved a far greater variety of adaptations than vertebrates modifications aiding survival in the remarkably different biotopes they occupy. The number of species in itself suggests this multiformity; each of them has peculiarities of its own, in morphology as well as in physiology and behavior. But these special adaptations are variations on a few great themes. Although the catalogue of invertebrate species is immense, the literature concerning them nearly rivals it in extent-even if one considers only that fraction dealing with visual physiology. Taxonomy proceeds by grouping the species, categorizing them in genera, families, orders, and progressively larger units. Similarly, comparative physiology aims at an analogous, more or less compre hensive, classification. This Part A of Volume VII/6, like Part B that follows it, emphasizes the broad questions that concern groups larger than the individual species; in some cases these questions have general applicability. The middle course between approaches that are too specialized and those that are too general is often elusive, but here we attempt to follow it. The vast number of special adaptations-probably, as we have said, as large as the number of species-is beyond the range even of a handbook
 
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