Comparative studies of chromophore contents inside and outside the rhabdoms of arthropod compound eyes

1989 ◽  
Vol 165 (5) ◽  
pp. 589-604 ◽  
Author(s):  
Eisuke Eguchi ◽  
Takaharu Seki ◽  
Tatsuo Suzuki
Keyword(s):  
Comparative Studies ◽  
Compound Eyes

scholarly journals Comparative Studies on Dark Adaptation in the Compound Eyes of Nocturnal and Diurnal Lepidoptera

1960 ◽  
Vol 44 (1) ◽  
pp. 195-203 ◽  
Author(s):  
C. G. Bernhard ◽  
D. Ottoson
Keyword(s):  
Comparative Analysis ◽  
Comparative Studies ◽  
Dark Adaptation ◽  
Time Course ◽  
Electrical Response ◽  
Compound Eyes ◽  
Second Phase ◽  
Nocturnal Species ◽  
Two Phases ◽  
Diurnal Species

A comparative analysis has been carried out of the time course and range of dark adaptation in the compound eyes of some common butterflies and noctuid moths (Lepidoptera). The change in sensitivity of the eye during dark adaptation was determined by measurements of the intensity of illumination necessary to elicit an electrical response of a given magnitude of the eye. It was found that the curve for dark adaptation in the diurnal species was smooth. The range of adaptive change varied in different species but usually did not cover more than 1 to 1.5 log units. In the nocturnal species the dark adaptation was found to proceed in two phases. The first phase was usually completed in less than 10 minutes and covered a range of 1 to 1.5 log units. The second phase was more prolonged and covered a range of 2 to 3 log units. In some of the experiments on nocturnal species the second phase failed to appear. Measurements of the size of the response at different intensities showed that the intensity/amplitude relationship was the same in the light-adapted eye as in the dark-adapted eye. In the nocturnal insects the response of the eye in the light-adapted condition was about 20 per cent of that in the dark-adapted eye, while in diurnal insects it was about 60 per cent.

COMPARATIVE STUDIES ON THE COMPOUND EYES OF LARVAE AND ADULTS OF AN AESCHNID DRAGONFLY,ANAX NIGROFASCIATUS NIGROFASCIATUS.(I) DORSAL PART

1998 ◽  
Vol 1 (1) ◽  
pp. 15-31 ◽  
Author(s):  
Katsuhiko Sakamoto ◽  
Takaharu Seki ◽  
Sachiko Koseki ◽  
Takahito Kashiwagi ◽  
Eisuke Eguchi
Keyword(s):  
Comparative Studies ◽  
Compound Eyes ◽  
Dorsal Part

Differentiation Processes of the Ocellar Retina of the Honeybee (Apis Mellifera L.)

1990 ◽  
Vol 48 (3) ◽  
pp. 430-431
Author(s):  
Maria Anna Pabst
Keyword(s):  
Apis Mellifera ◽  
Distal Part ◽  
Cell Layer ◽  
Single Layer ◽  
Photoreceptor Cells ◽  
Distal Segment ◽  
Compound Eyes ◽  
Thin Sections ◽  
Ultrastructural Studies ◽  
Adult Worker

In addition to the compound eyes, honeybees have three dorsal ocelli on the vertex of the head. Each ocellus has about 800 elongated photoreceptor cells. They are paired and the distal segment of each pair bears densely packed microvilli forming together a platelike fused rhabdom. Beneath a common cuticular lens a single layer of corneagenous cells is present.Ultrastructural studies were made of the retina of praepupae, different pupal stages and adult worker bees by thin sections and freeze-etch preparations. In praepupae the ocellar anlage consists of a conical group of epidermal cells that differentiate to photoreceptor cells, glial cells and corneagenous cells. Some photoreceptor cells are already paired and show disarrayed microvilli with circularly ordered filaments inside. In ocelli of 2-day-old pupae, when a retinogenous and a lentinogenous cell layer can be clearly distinguished, cell membranes of the distal part of two photoreceptor cells begin to interdigitate with each other and so start to form the definitive microvilli. At the beginning the microvilli often occupy the whole width of the developing rhabdom (Fig. 1).

Further Comparative Studies on Ascites in Liver and Heart Disease

1950 ◽  
Vol 16 (1) ◽  
pp. 91-103 ◽  
Author(s):  
John A. Layne ◽  
F.R. Schemm ◽  
W.W. Hurst
Keyword(s):  
Heart Disease ◽  
Comparative Studies

A Reply to Kuder's Criticism of SVIB-KOIS Comparative Studies

1972 ◽  
Vol 5 (1) ◽  
pp. 306-309
Author(s):  
Arthur J. O'Shea ◽  
Mervin D. Lynch ◽  
Thomas F. Harrington
Keyword(s):  
Comparative Studies
Sign in / Sign up

Export Citation Format

Share Document