Topic
Actinophryid
About: Actinophryid is a research topic. Over the lifetime, 4 publications have been published within this topic receiving 97 citations.
Papers
TL;DR: The evidence supports the contention that these heliozoa have a common ancestry with the heterokont algae and have evolved along a line involving the pedinellids and some colourless helioflagellates, and a substantial reclassification of these organisms is required.
Abstract: The fine structure of Pteridomonas danica, a new species of helioflagellate (protozoa), is described The organism has a single apical flagellum which bears two rows of tripartite tubular hairs There are two kinetosomes which are bound to each other and to the surface of the single nucleus by amorphous electron-dense material The flagellum is surrounded by a wreath of fine arms, which are supported internally by triads of microtubules The triads terminate on the nucleus The mitochondria have tubular cristae which contain wisps of intracristal material The dictyosomes are located in the posterior part of the cell, being clustered around the internal element of the contractile stalk Extrusomes are present Pteridomonas has substantial similarities with the colourless flagellate Ciliophrys and with the pedinellid algal flagellates As Ciliophrys resembles the actinophryid heliozoa in several important respects, the evidence supports the contention that these heliozoa have a common ancestry with the heterokont algae and have evolved along a line involving the pedinellids and some colourless helioflagellates If the perceived relationships are to be reflected in their taxonomy, then a substantial reclassification of these organisms is required
63 citations
TL;DR: Aulacomonas submarina is a free-living freshwater heterotrophic flagellate that has two long, nearly equal flagella that insert apically and beat asynchronously and cannot be assigned to any familiar subgroup of heterokont organisms or other group of flageLLates.
21 citations
TL;DR: A new fresh water species of Actinosphaerium is described, the fourth member of the genus, with the more significant of its diagnostic traits: the Actinophrys-like nuclei with peripheral nucleolar granules and without central rosette-shaped nucleoli.
Abstract: SYNOPSIS. A new fresh water species of Actinosphaerium is described, the fourth member of the genus. Some of the more significant of its diagnostic traits are: 1) the Actinophrys-like nuclei with peripheral nucleolar granules and without central rosette-shaped nucleoli, 2) the occurrence of some nuclei in the ecto-endoplasmic border and the insertion of axial filaments on them, and 3) the low ratio of endoplasm to ectoplasm.
16 citations
Journal Article•
TL;DR: Cytochalasin B (50 μg/ml) strongly inhibited extrusome movement at the surfaces of newly-formed food vacuoles, suggesting that the actomyosin system is involved in the organelle transport in Actinophrys.
Abstract: Movement of extrusomes in the heliozoon Actinophrys sol was characterized at surfaces of the cell body and giant food vacuoles where microtubules are absent. Extrusomes moved in a saltatory manner at an average velocity of 0.5 μms^(-1). The highest velocity observed was 2.1 μms^(-1). Cytochalasin B (50 μg/ml) strongly inhibited extrusome movement at the surfaces of newly-formed food vacuoles, suggesting that the actomyosin system is involved in the organelle transport in Actinophrys.
4 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2003 | 1 |
| 1990 | 1 |
| 1985 | 1 |
| 1958 | 1 |