Electron microscopy of Trichamoeba villosa and amoeboid movement

Bhowmick, Dilip Kumar

doi:10.1016/0014-4827(67)90161-9

Cited by 32 publications

(7 citation statements)

References 32 publications

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“…2 b, 3 b). This corroborates with the finding of (Nachmias, 1964;Bhowmick, 1967) that in amoebae an intense fibrillogenesis occurs in the near vicinity of the point of application of a microneedle. So, the total F-actin at the posterior pole of our anterior fragments may be partly inherited from the original asymmetry of its distribution in the intact cell, and partly produced by the fibrillogenesis at the dissection site.…”

Section: Fragments Cut Behind the Nucleussupporting

confidence: 92%

Differences in the motility of Amoeba proteus isolated fragments are determined by F‐actin arrangement and cell nucleus presence

Grebecka¹

1995

Cell Biology International

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Isolated fragments produced by bisection of Amoeba proteus differ by their position in the original cell and by the presence or absence of the cell nucleus. Immediately after the operation, both types of anterior fragments preserve the former motory polarity, and do not interrupt locomotion. In the same time, all posterior fragments stop, round up and fail to react stimuli. In the second phase of experiment, these anterior fragments, which had no nucleus ceased to move, whereas the nucleated posterior ones resumed locomotion. It was demonstrated, that the behaviour of a fragment is primarily determined by the peripheral F-actin distribution, which is different depending on the origin of the fragment either from the anterior or from the posterior cell region. Later, the "inherited" F-actin distribution may be stabilized or reorganized in the presence of the nucleus, or desorganized in its absence.

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Section: Fragments Cut Behind the Nucleussupporting

confidence: 92%

Differences in the motility of Amoeba proteus isolated fragments are determined by F‐actin arrangement and cell nucleus presence

Grebecka¹

1995

Cell Biology International

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“…1, 4). In Acanthamoeba, as in other amebae (7,21,47,51), the hyaline region is seen with the electron microscope to contain only the smallest of the formed elements within the cell: glycogen particles, free ribosomes, and some small vesicles and tubules 96 THE JOURNAL OF CELL BIOLOGY VOLUME 39, 1968 The fibrils are on the order of 50 A in diameter.…”

Section: The Cell Surfacementioning

confidence: 98%

THE FINE STRUCTURE OF ACANTHAMOEBA CASTELLANII

Bowers

Korn

1968

The Journal of Cell Biology

206

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The fine structure of the trophozoite of Acanthamoeba castellanii (Neff strain) has been studied. Locomotor pseudopods, spikelike "acanthopodia," and microprojections from the cell surface are all formed by hyaline cytoplasm, which excludes formed elements of the cell and contains a fine fibrillar material. Golgi complex, smooth and rough forms of endoplasmic reticulum, digestive vacuoles, mitochondria, and the water-expulsion vesicle (contractile vacuole) are described. A canicular system opening into the water-expulsion vesicle contains tubules about 600 A in diameter that are lined with a filamentous material. The tubules are continuous with unlined vesicles or ampullae of larger diameter. Centrioles were not observed, but cytoplasmic microtubules radiate from a dense material similar to centriolar satellites and are frequently centered in the Golgi complex. Cytoplasmic reserve materials include both lipid and glycogen, each of which amounts to about 10% of the dry weight.

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“…Chaos (2 l), and Polychaos (1 9). to an amorphous layer as in A. leningradensis (20) (26) within Trichamwba and including the type species, T. villosa (4), have a single mass of centrally located nucleolar material. Similar diversity in nucleolar organization has been noted in the genus Thecamoeba ( 1 7).…”

Section: Page Unpubl)mentioning

confidence: 99%

Ultrastructure and Description of a Fungus‐Feeding Amoeba, Trichamoeba mycophaga n. sp. (Amoebidae, Amoebea), from Australia¹

Chakraborty

Old

1986

The Journal of Protozoology

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Nematol.. 7 : 34-40. 28. Wallich. G . C. 1863. O n an undescribcd indigenous form of Amoeba. Ann. Mag. Nut. Hist.. 11: 365-371. Received I5 I V 86; accepted 5 VIII 86 t Figs. 14-16. Electron micrographs of Trichamoeh mycophaga. 14. Nucleus showing the single central nucleolus within difise nucleoplasm surrounded by a more dense matrix. Note the peripheral strands of microfibrillar material (arrows). Bar = I pm. 15. Tangential section of nucleus showing nuclear pores (arrows) and microfibrillar material. Bar = 0.5 pm. 16. A section of Fig. I5 detailing microfibrillar material. Bar = 0.1 pm.

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Electron microscopy of Trichamoeba villosa and amoeboid movement

Cited by 32 publications

References 32 publications

Differences in the motility of Amoeba proteus isolated fragments are determined by F‐actin arrangement and cell nucleus presence

Differences in the motility of Amoeba proteus isolated fragments are determined by F‐actin arrangement and cell nucleus presence

THE FINE STRUCTURE OF ACANTHAMOEBA CASTELLANII

Ultrastructure and Description of a Fungus‐Feeding Amoeba, Trichamoeba mycophaga n. sp. (Amoebidae, Amoebea), from Australia¹

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Electron microscopy of Trichamoeba villosa and amoeboid movement

Cited by 32 publications

References 32 publications

Differences in the motility of Amoeba proteus isolated fragments are determined by F‐actin arrangement and cell nucleus presence

Differences in the motility of Amoeba proteus isolated fragments are determined by F‐actin arrangement and cell nucleus presence

THE FINE STRUCTURE OF ACANTHAMOEBA CASTELLANII

Ultrastructure and Description of a Fungus‐Feeding Amoeba, Trichamoeba mycophaga n. sp. (Amoebidae, Amoebea), from Australia1

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Ultrastructure and Description of a Fungus‐Feeding Amoeba, Trichamoeba mycophaga n. sp. (Amoebidae, Amoebea), from Australia¹