By H. Autrum, M. F. Bennet, B. Diehn, K. Hamdorf, M. Heisenberg, M. Järviletho, P. Kunze, R. Menzel, W. H. Miller, A. W. Snyder, D. G. Stavenga, M. Yoshida

ISBN-10: 3642669999

ISBN-13: 9783642669996

ISBN-10: 3642670016

ISBN-13: 9783642670015

In the comparative body structure of photoreception through the Protista and the invertebrates features are emphasised: (1) the range of visible tactics in those teams and (2) their bearing upon common mechanisms of photoreception. Invertebrates have advanced a miles higher number of diversifications than vertebrates­ adjustments supporting survival within the remarkably varied biotopes they occupy. The variety of species in itself indicates this multiformity; each one of them has peculiarities of its personal, in morphology in addition to in body structure and behaviour. yet those targeted diversifications are adaptations on a number of nice issues. even though of invertebrate species is gigantic, the literature pertaining to them approximately competitors it in extent-even if one considers simply that fraction facing visible body structure. Taxonomy proceeds via grouping the species, categorizing them in genera, households, orders, and gradually higher devices. equally, comparative body structure goals at the same, roughly compre­ hensive, category. This half A of quantity VII/6, like half B that follows it, emphasizes the vast questions that situation teams greater than the person species; every now and then those questions have common applicability. the center direction among methods which are too really good and people who are too common is frequently elusive, yet right here we strive to keep on with it. The significant variety of specified adaptations-probably, as we've got stated, as huge because the variety of species-is past the diversity even of a handbook.

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II. Signal Processing: Systems Analytical Approaches 50 50 50 49 52 55 24 B. DIEHN: Photic Responses and Sensory Transduction F. Interactions of Photosensory and Other Stimuli I. Mechanical Stimulation II. Chemoresponses III. Gravity Sensing G. Summary and Outlook . . I. Experimental Approaches II. Open Problems References ......... 59 60 61 62 63 63 64 65 A. Introduction I. Rationale F or Investigating Photomovement The fact that some unicellular organisms respond to illumination by accumulating either at the light or dark side of the vessel in which they are contained, has been the subject of scientific study for more than 150 years.

Kinesis and Phobic Responses . . . . 2. Taxes . . . . . . . . . II. Signal Processing: Systems Analytical Approaches 50 50 50 49 52 55 24 B. DIEHN: Photic Responses and Sensory Transduction F. Interactions of Photosensory and Other Stimuli I. Mechanical Stimulation II. Chemoresponses III. Gravity Sensing G. Summary and Outlook . . I. Experimental Approaches II. Open Problems References ......... 59 60 61 62 63 63 64 65 A. Introduction I. Rationale F or Investigating Photomovement The fact that some unicellular organisms respond to illumination by accumulating either at the light or dark side of the vessel in which they are contained, has been the subject of scientific study for more than 150 years.

Action Spectra 37 A different approach is offered by the technique of in vivo fluorescence-emission spectroscopy. Although screening may still cause problems, selective excitation of fluorescence can allow the localization of structures bearing specific pigments. This method can also be used successfully with organelles that are too small, or too lightly pigmented, for absorption methods. Since flavins had been implicated as the photoreceptor pigment by action spectrum measurements (DIEHN, 1969b, and others, vide infra), BENEDETTI and CHECCUCCI (1975) illuminated live Euglenae with excitation light of 360 and 450 nm.

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Comparative Physiology and Evolution of Vision in Invertebrates: A: Invertebrate Photoreceptors by H. Autrum, M. F. Bennet, B. Diehn, K. Hamdorf, M. Heisenberg, M. Järviletho, P. Kunze, R. Menzel, W. H. Miller, A. W. Snyder, D. G. Stavenga, M. Yoshida


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