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Substrate Contact, Mucus, and Eugregregarine Gliding (1983)

MACKENZIE, CAROLE ; WALKER, MURIEL H.

Oxford, UK : Blackwell Publishing Ltd

The @journal of eukaryotic microbiology 30 (1983), S. 0

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ISSN: 1550-7408

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: . Experiments have been carried out on Gregarina garnhami to examine some of the factors that may be significant in gliding. Suspension of gregannes in Ficoll showed that substrate contact is essential. Reflection interference microscopy shows that there are fluctuating surface/substrate contacts, but it is not necessary for the whole of the undersurface of the cell to be in close contact with the substrate. Gliding is always accompanied by the formation of a mucus trail. The effects of the drugs amphetamine and ephedrine on mucus trail formation and gliding have been examined. Lateral undulations of the epicyte folds have previously been implicated in grcgarinc gliding, but G. garnhami does not exhibit lateral undulations of the epicyte folds as it moves. The folds are predominantly straight with indications of varicosities or swellings along the length of the folds. These observations are discussed in relation to gliding movement.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1550-7408.1983.tb01024.x

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Bacteria-like structures in the endoplasm of Gregarina garnhami (Eugregarinida, Protozoa) (1979)

Mackenzie, Carole ; Walker, Muriel H.

Springer

Cell & tissue research 202 (1979), S. 33-39

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ISSN: 1432-0878

Keywords: Gregarina ; Ultrastructure ; Gram negative bacteria

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary An investigation of bacteria-like structures, which are found in large numbers in the endoplasm of the eugregarine, Gregarina garnhami, was carried out using light and electron microscopy. Gram staining indicates that these structures are gram negative; they show orange fluorescence when stained with acridine orange. Ultrastructural observations show that they resemble the endosymbiotic bacteria found in other protozoan species. Some of these structures appear to be dividing, and the possibility that these structures are in fact bacteria is discussed.