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  • 1
    Online Resource
    Online Resource
    Cham :Springer International Publishing :
    Keywords: Microbial ecology. ; Microbiology. ; Freshwater ecology. ; Marine ecology. ; Microbial Ecology. ; Microbiology. ; Freshwater and Marine Ecology.
    Description / Table of Contents: What is a Protozoon -- Motility: Life in Syrup -- Orientation in the Environment -- Feeding -- Bioenergetics -- Polymorphic Life Histories and Sex -- The Niches of Protozoa -- Symbiosis -- Marine Habitats -- Protozoan Communities in Freshwater Habitats -- Protozoan Communities: Terrestrial Habitats -- Symbiotic Protozoa -- Concluding Remarks.
    Abstract: This book emphasises the important role that protozoa play in many natural eco­systems. To shed new light on their individual adaptive skills, the respective chapters examine the ecology and functional biology of this diverse group of eukaryotic microbes. Protozoa are well-established model organisms that exemplify many general problems in population ecology and community ecology, as well as evolutionary biology. Their particular characteristics, like large population sizes, life cycles and motile sensory behaviour, have a profound impact on their survival, distribution, and interaction with other species. Thus, readers will also be introduced to protozoan habitats in a broad range of environments. Even though this group of unicellular organisms is highly diverse, the authors focus on shared ecological patterns. Students and scientists working in the areas of eukaryotic microbiology and ecology will appreciate this updated and revised 2nd Edition as a valuable reference guide to the “lifestyles” of protozoa. .
    Type of Medium: Online Resource
    Pages: X, 186 p. 73 illus., 24 illus. in color. , online resource.
    Edition: 2nd ed. 2020.
    ISBN: 9783030599799
    DDC: 579.17
    Language: English
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  • 2
    Publication Date: 2024-03-11
    Keywords: Abundance per volume; Carbon per cell; Cell biovolume; Ciliates, cell biovolume; Ciliates, equivalent spherical diameter; Clearance rate per individual; Equivalent spherical diameter; Event label; EXP; Experiment; Grazing rate per individual; Gross growth efficiency; S_sulcatum_FEEDEXP_2; Taxon/taxa; Treatment: temperature; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 219 data points
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  • 3
    Publication Date: 2024-01-26
    Keywords: EXP; Experiment; Protozoa_RESEXP; Respiration rate, oxygen, per individual; Species; Treatment: temperature; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 470 data points
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 38 (1991), S. 0 
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Endosymbiotic methanogenic bacteria of three species of anaerobic ciliates (Plagiopyla frontata, Metopus conforms, and M. palaeformis) were inactivated with the specific methanogen inhibitor 2-bromoethanesulfonic acid. the absence of endosymbiont methanogens reduced growth rate and growth yield by about 30% in P. frontata and M. contortus, while no significant change in fitness was observed in M. palaeformis. In Plagiopyla the growth rate constant is not affected by an artificially increased pH2 neither in normal nor in methanogen-free ciliates. the energetic advantage conferred by endosymbiont methanogens in Plagiopyla and in Metopus contortus probably is due to excretion of organic material from the bacteria at the expense of bacterial reproduction. It is unlikely that the maintenance of a low pH2 within the cells due to H2-consumption by the bacteria is important to the ciliates.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 33 (1986), S. 0 
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . Behavioral responses to light at different oxygen tensions were studied in the ciliate Loxodes striatus. In the absence of O2 it does not react to light. In the presence of O2 it reacts to light as if the pO2 had been further increased, with the induction of positive geotaxis, a transient phobic response, and finally with a permanent kinetic response (increased swimming velocity and a decreased rate of tumbling). Cells treated with cyanide behave as cells in an anoxic environment and do not react to light. It is concluded that the light response is due to the photochemical production of oxygen radicals and that the sensory receptors for O2 and for light are identical. The three types of behavioral response (geotaxis, transient, and kinetic responses) are discussed in terms of their adaptive significance for the orientation of Loxodes in the natural environment.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 41 (1994), S. 0 
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . Strombidium purpureum Kahl, is an anaerobic oligotrichous ciliate with endosymbiotic phototrophic bacteria. Like other anaerobic ciliates, S. purpureum reacts to O2-pressure. In the light, the ciliates avoid even traces of O2 (〈 1% atmospheric saturation). In the dark, however, the ciliates accumulate in water with a pO2 of 1–4% atmospheric saturation. Experiments show that ciliates which have accumulated in the dark under microaerophilic conditions react when the light is turned on, and their ability to escape is enhanced by steep O2-gradients. The ciliates orient themselves in O2-gradients by a series of phobic responses. They tumble whenever they swim towards a higher O2-tension and thus they eventually all swim in the direction of lower pO2. The ecological implications of such behaviour are discussed.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 33 (1986), S. 0 
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . The Müller vesicle is a characteristic organelle of loxodid ciliates. Its structure and development have been investigated using light microscopy and TEM. The organelle consists of a membrane-covered mineral body (the statolith), a vacuole, and various structures derived from the overlying kinety. There is strong evidence that the vesicle functions as a gravity sensor: a) its structure and relative dimensions fulfil the minimum requirements of a functional statocyst; b) its structure bears a close resemblance to the statocysts of some higher animals; c) re-orientation of the cell with respect to gravity produces a gravity-induced displacement of the mineral body, and d) geotaxis in Loxodes can be demonstrated experimentally. The transduction of the signal probably takes place at the level of the two kinetosomes of the organelle, one of which is in close contact with the cell membrane, while the other is connected to the statolith by a fairly rigid stalk containing a bundle of microtubules.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 38 (1991), S. 0 
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The life cycle of a methanogenic bacterium, symbiotic within the marine, free-living anaerobic ciliate Plagiopyla frontata, was studied using light microscopy and transmission electron microscopy (TEM). the bacteria are disc-shaped. During the growth phase of the host, bacteria and hydrogenosomes (organelles which ferment pyruvate into acetate and hydrogen) are arranged in conglomerates resembling stacks of coins in which bacteria and hydrogenosomes alternate; hydrogenosomes always cap the ends of the stacks. During the growth phase, numbers of hydrogenosomes and bacteria remain constant (about 5,000 and 3,500 per cell, respectively). Hydrogenosomes increase in volume shortly after cell division. Methanogens increase in volume slowly during the growth phase of the ciliate and rapidly when the ciliate begins to divide. the hydrogenosomes divide mainly during the initial phases of cell division while the methanogens divide synchronously during the last phase of ciliate division. the timing of reproduction of the symbionts is controlled by the host-cell cycle. the ciliate is known to receive an energetic advantage from its symbionts. the suppression of continuous bacterial reproduction may trigger the secretion of excess bacterial production as soluble organic compounds, for use by the ciliate.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 24 (1977), S. 0 
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Marine, sediment-dwelling ciliates were examined for cytochrome oxidase activity by a cytochemical method and for fine structural details. Species of Plagiopylidae (Trichostomatida), i.e. Plagiopyla frontata, Sonderia vorax and Sonderia sp., and of Heterotrichida, i.e., Parablepharisma pellitum, Parablepharisma sp., Metopus contortus, Metopus vestitus and Caenomorpha capucina; previously considered to be obligate anaerobes because of their sulfide-containing habitat, do not have cytochrome oxidase activity or mitochondria with cristae or tubuli. The evolutionary origin and significance of anaerobic ciliates is discussed. Most of the anaerobic ciliates harbor a flora of ecto- and endosymbiotic bacteria as demonstrated by transmission and scanning electron micrographs. It is speculated that the bacteria may utilize the metabolic end products of the protozoa for growth and energy yielding processes. These associations are also compared with other, previously described cases of symbiosis involving prokaryotes and protozoa.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 444 (2006), S. 31-31 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sir We are indebted to Lynn J. Rothschild for debunking, in Journal Club, some microbial myths (Nature 443, 249; 2006 doi:10.1038/443248a). Her prime concern is that many microbiologists have simply given up ...
    Type of Medium: Electronic Resource
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