ArticleCell and tissue research1984
A unique photoreceptive structure in the arrowworms Sagitta crassa and Spadella schizoptera (Chaetognatha).
Article in Cell and tissue research, 1984. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
2 citing papers in PubMed.
- Characterization of eyes, photoreceptors, and opsins in developmental stages of the arrow worm Spadella cephaloptera (Chaetognatha).Journal of experimental zoology. Part B, Molecular and developmental evolution · 2023Article
- A new look at the ventral nerve centre of Sagitta: implications for the phylogenetic position of Chaetognatha (arrow worms) and the evolution of the bilaterian nervous system.Frontiers in zoology · 2007Article
Corrections and comments
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Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The ultrastructure of photoreceptors in two species of chaetognaths, Sagitta crassa and Spadella schizoptera, was studied by electron microscopy using a goniometer specimen stage as well as by freeze-fracture techniques. In contrast to earlier descriptions, the photoreceptor is made up of a stack of lamellae with pores. The lamellae, each 30-45 nm in thickness, are piled one on top one another at intervals of 10-20 nm. The lamellar surface is often perpendicular to the incident light. The pores are 35-55 nm in diameter and arranged in an orderly square lattice with a center-to-center distance of 80-95 nm. These perforated lamellar structures, resembling annulate lamellae, are entirely new as photoreceptive structures.
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Registered trials
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