Birefringent periodicities in amphibian rod outer segments.

Abstract:

:Birefringence variations, seen as regularly spaced altering light and dark rings (bands), have been observed along the length of unfixed, freshly isolated rod outer segments (ROS) of both Rana pipiens and Xenopus laevis. In our hands, the spatial frequency of the banding pattern is from 1.3-1.6u/band in Rana pipiens and 1.8-2.2u/band in Xenopus laevis ROS, both corresponding closely to determinations we made in the same animals of the quantity of new ROS disks added each day. To further probe this correlation, Xenopus laevis were maintained at 16 degrees C to lower the disk renewal rate. A similar correspondence was found, with the banding pattern and renewal rate both at 0.8-1.Ou/day. Further experiments involving Xenopus laevis placed on altered lighting cycles have suggested the existence of two normally superimposed periodicities. The more intense component is driven by the environmental light cycle, and thus may be regarded as diurnal. The less intense component is seen infrequently, suggesting lability, and apparently follows a 24-hour period in both constant light and darkness.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Andrews LD,Mackenzie JM Jr,Basinger SF

doi

10.3109/02713688409007412

subject

Has Abstract

pub_date

1984-11-01 00:00:00

pages

1265-72

issue

11

eissn

0271-3683

issn

1460-2202

journal_volume

3

pub_type

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