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  • 1
    Loose Leaf
    Loose Leaf
    Protocols in protozoology (1992)
    Lawrence : Society of Protozoologists
    Details Availability
    Type of Medium: Loose Leaf
    Pages: Losebl.-Ausg.
    ISBN: 0935868577
    DDC: 593.1078
    Language: Undetermined
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  • 2
    Electronic Resource
    Electronic Resource
    AXENIC CULTURE OF PARAMECIUM—SOME OBSERVATIONS ON THE GROWTH BEHAVIOR AND NUTRITIONAL REQUIREMENTS OF A PARTICLE-BEARING STRAIN OF PARAMECIUM AURELIA 299λ (1963)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 108 (1963), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1963.tb13392.x
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  • 3
    Electronic Resource
    Electronic Resource
    Infectious particles in a marine ciliate (1974)
    [s.l.] : Nature Publishing Group
    Nature 249 (1974), S. 284-286 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The xenosomes were found in aceto-orcein-stained preparations4 under the phase microscope (Fig. la). They seemed to be distributed randomly throughout the cytoplasm. We have maintained one xenosome-bearing stock, a small hy-menostome ciliate identified as Parauronema acutum 110-3, for more than 2 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/249284b0
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  • 4
    Electronic Resource
    Electronic Resource
    The Extent of Algal and Bacterial Endosymbioses in Protozoa, (1985)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 32 (1985), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Long neglected has been the extensive and more or less intimate association of protozoa with a wide variety of other cells, either prokaryotic or eukaryotic in nature. Yet study of such relationships can provide important information concerning certain basic aspects of cellular evolution in general. A survey is offered here of the whole range of such symbiotic associations (i.e. with species of protozoa serving as hosts) with the purposes of drawing attention to the exciting possibilities of such research and of reviewing significant findings made to date. Because of the vastness of the overall field, examples and discussion are primarily limited to consideration of the following major studies: methanogenic bacteria in certain ciliates, bacterial endosymbionts of the large freshwater amoeba Pelomyxa palustris (itself an amazing organism from an evolutionary/phylogenetic point of view), the rod-shaped bacteria found in Amoeba proteus, the “Greek-letter” prokaryotes of Paramecium species, the xenosomes (sensu stricto) of the marine scuticociliate Parauronema acutum, and the diverse algal endosymbionts of similarly diverse protozoan taxa–ciliates, flagellates, radiolarians, acantharians, and foraminifera.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1985.tb04034.x
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  • 5
    Electronic Resource
    Electronic Resource
    The Invasive Nature of an Infectious Bacterial Symbiont (1993)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 40 (1993), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . Xenosomes are infectious bacterial symbionts that exist exclusively in the cytoplasm of the small philasterine marine ciliate Parauronema acutum. We have used this host-symbiont system as a model to study infection. In the past we postulated that infection took place by a process in which the symbionts escaped digestion and entered into the host's cytoplasm through the food vacuole during phagocytosis. This is clearly not the case. We now present evidence based on electron microscopic observations that the symbionts infect in a manner involving direct penetration of the protozoan's cell membranes. We have obtained additional data that suggest that, following entrance of the symbionts into the cytoplasm, only a single xenosome is required to establish an infection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1993.tb04879.x
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  • 6
    Electronic Resource
    Electronic Resource
    Circular DNA of Entamoeba histolytica Encodes Ribosomal RNA (1989)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 36 (1989), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . The presence of repeated DNA sequences encoding RNA in Entamoeba histolytica has been reported. In the present study we demonstrate by agarose gel electrophoresis, DNase digestion and electron microscopic analysis that these genes are located on extrachromosomal circular DNA molecules with an approximate size of 26 kb. Detection of replication intermediates suggests the episomal nature of these molecules.Amplified, extrachromosomal rRNA genes appear to be a common feature among the lower eukaryotes, occurring more commonly as linear molecules and less commonly as circles. Entamoeba histolytica is 1 of the few organisms studied in which rRNA genes are located predominantly on extrachromosomal circles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1989.tb01080.x
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  • 7
    Electronic Resource
    Electronic Resource
    Growth of Particle-Bearing and Particle-Free Paramecium aurelia in Axenic Culture (1966)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 13 (1966), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Several strains of particle-bearing and particle-free Paramecium aurelia have been cultivated in an axenic medium composed of proteose peptone, trypticase, yeast nucleic acid, MgSO4.7H2O, TEM-4T (diacetyl tartaric acid esters of tallow monoglycerides), stigmasterol and a mixture of vitamins. The “yeast fraction,” an indispensable component of previous media used for the cultivation of these ciliates has been replaced by a mixture of trypticase, yeast nucleic acid and TEM-4T.Particle-bearing animals of stock 299 lambda, 138 mu, and 139 pi maintain their particles when cultivated in the medium, whereas particle-bearing animals of stock 51 kappa, 225 kappa and 114 signia do not. With the exception of stock 92 (syngen 3) the medium appears to be selective in its ability to support the growth of animals of the even- but not odd-numbered syngens of P. aurelia.Maintenance of the particles was dependent only to a small degree upon environmental conditions brought about by changes in pH and temperature. Division of the particles was found to be comparable with the division of the protozoan. Methods for the growth, maintenance and mass cultivation of particle-bearing P. aurelia are given in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1966.tb01948.x
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