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  • 1
    Electronic Resource
    Electronic Resource
    Halbdesmosomen bei Phytoflagellaten (1970)
    Springer
    Cellular and molecular life sciences 26 (1970), S. 1343-1344 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Half-desmosome like structures binding the cell to the theca have been found in the phytoflagellatePlatymonas. The tonofilaments are parts of the flagellar root system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02113019
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  • 2
    Electronic Resource
    Electronic Resource
    Development and ultrastructure of the marine, parasitic oomycete, Lagenisma coscinodisci Drebes (Lagenidiales) (1978)
    Springer
    Archives of microbiology 116 (1978), S. 133-139 
    Details
    ISSN: 1432-072X
    Keywords: Lagenisma ; Coscinodiscus ; Infection ; Endosymbiotic bacteria ; Tip growth ; Wall-less thallus ; Host-parasite interface ; Membranes ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lagenisma coscinodisci is diplanetic and has two different cyst stages. The secondary cyst has a uniform cell wall of fibrillar material. It attaches to a Coscinodiscus frustule and germinates with an infection tube. The cyst becomes filled with an enlarging expulsion vacuole. The infection tube penetrates the diatom cell between the cingula. Inside the host cell the fungus grows as an irregularly branched wall-less thallus. In the hyphae apical vesicles are lacking. The infection tube is plugged by wall material. There are no microtubules which might participate in the morphogenesis of the thallus. The plasmalemma of the diatom is pushed inward but not pierced by the fungus. Along the host-parasite interface it lies closely paralled to the Lagenisma plasmalemma which is extremely straight here and measures about 10 nm instead of about 5–6 nm at the surfaces of other stages. The Coscinodiscus plasmalemma disintegrates at about the same time when the cytoplasm breaks down. The fungus allows bacteria to enter the diatom; there are also endosymbiontic bacteria in unattacked cells — The growth mechanisms are discussed and the host-parasite interface is compared with that of other fungi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406028
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Cytologie und taxonomischen Einordnung von Glaucocystis (1966)
    Springer
    Archives of microbiology 55 (1966), S. 149-174 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary Glaucocystis is an unicellular alga with endosymbiontic blue-green algae and is usually thought to be an apoplastidic Oocystis. However, our light and electron microscopical investigations show, that there is no relationship to Oocystis, since Glaucocystis has two reduced flagella, contractile vacuoles (during the cell division), and a different symmetry of the cell. A survey on the position of the Golgi apparatus in the different groups of algae demonstrates that Glaucocystis is most probably no chlorophycean since its dictyosomes surround the flagellar base and are therefore in contrast to that of green algae in parabasal position. Due to the lack of other specific characteristics as well as own pigments it seems us very difficult to place at present Glaucocystis in the taxonomic system of the algae.
    Notes: Zusammenfassung Glaucocystis ist eine einzellige Alge mit endosymbiontischen Cyanophyceen, die gewöhnlich für eine apoplastidische Oocystis gehalten wird. Gegen diese taxonomische Einordnung sprechen verschiedene Befunde unserer licht- und elektronenmikroskopischen Untersuchungen, unter anderem der Besitz zweier rudimentärer Geißeln, pulsierender Vacuolen (während der Zellteilung) und die Zellsymmetrie. Wie aus einer tabellarischen Übersicht über die Anordnung des Golgi-Apparates in den verschiedenen Algengruppen hervorgeht, ist es sehr unwahrscheinlich, daß Glaucocystis überhaupt eine Chlorophycee ist, denn ihre Dictyosomen liegen im Gegensatz zu denen der Grünalgen ringförmig um die Geißelbasis, sind also parabasal angeordnet. Weil weitere spezifische Merkmale sowie eigene Pigmente fehlen, scheint uns eine taxonomische Einordnung vorerst nicht möglich zu sein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00418636
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  • 4
    Electronic Resource
    Electronic Resource
    Über die Auslösung der Valvenbildung bei der Diatomee Cyclotella cryptica (1970)
    Springer
    Archives of microbiology 71 (1970), S. 199-213 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Colchicin hemmt die Zellteilung von Cyclotella cryptica aber nicht die Bildung von Valven. Als Folge davon entstehen “Lateralschalen” (Badour, 1968). Die Bildung dieser Lateralschalen (und damit auch die Bildung normaler Valven) hängt weder direkt von der Mitose noch vom Plasmawachstum ab. 2. Messungen des DNA-Gehaltes von Kernen aus Zellen mit und ohne Lateralschalen und die Hemmung der Nucleinsäure-Synthese durch Actinomycin D und der DNA-Synthese durch FUDR zeigen, daß die Bildung der Lateralschalen von der DNA-Replikation abhängt. Sie wird durch Faktoren induziert, die in der Soder, wahrscheinlicher, in der G2-Phase entstehen. 3. Die Hemmung der DNA-Synthese durch Actinomycin D geht in Anwesenheit von Colchicin zurück.
    Notes: Summary 1. Colchicine inhibits the cytokinesis of Cyclotella cryptica but not the deposition of valvae. As a consequence “lateral valvae” are formed (Badour, 1968). The formation of these lateral valvae (and, therefore, also of normal valvae) neither depends directly on mitosis nor on plasmatic growth. 2. Measurements of the DNA content of nuclei of cells with and without lateral valvae and inhibition of nucleic acid synthesis by actinomycin D and of DNA synthesis by FUDR show that the formation of lateral valvae depends on DNA replication. It is induced by factors which arise in the S- or, more probably, in the G2-phase. 3. The inhibition of DNA synthesis by actinomycin D decreases in the presence of colchicine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00410153
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  • 5
    Electronic Resource
    Electronic Resource
    Elektronenmikroskopische Beobachtungen an Parasiten aus Scenedesmus-Massenkulturen (1974)
    Springer
    Archives of microbiology 98 (1974), S. 133-145 
    Details
    ISSN: 1432-072X
    Keywords: Scenedesmus Mass Cultures ; Infection by Bacteria ; Bacteriophages ; Fine Structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spirillum-like bacteria infect Scenedesmus acutus under certain physical conditions of mass culture. They invade the algal cell by perforating its wall, preferentially at one of the two cell tips. As an early event in the development of the disease the host plasmalemma undergoes vesiculation at the site of bacterial infection and vanisches in the other parts of the host cell about at the same time. Beginning in the invaded cell tip the parasites digest the cytoplasm of the Scenedesmus cell and, finally, even the inner, carbohydratous wall layer. Beside this Spirillum-like organism another bacterium sometimes infects and destroys the algae and is, in turn, often lysed by phages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425276
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  • 6
    Electronic Resource
    Electronic Resource
    Über die Entstehung der pulsierenden Vacuolen von Vacuolaria virescens (Chloromonadophyceae) aus dem Golgi-Apparat (1966)
    Springer
    Archives of microbiology 54 (1966), S. 229-236 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408995
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  • 7
    Electronic Resource
    Electronic Resource
    Elektronenmikroskopische Beobachtungen an Parasiten aus Scenedesmus-Massenkulturen (1971)
    Springer
    Archives of microbiology 75 (1971), S. 209-229 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Encystierte Aphelidium-Zoosporen durchdringen die Zellwand ihres Wirtes, Scenedesmus armatus, und entwickeln einen endophytischen, amöboiden Plasmakörper, der das Wirtsplasma phagocytiert. Das Parasitenplasmalemma bildet mit Teilen des Wirtsplasmalemmas “compound membranes”. Diese können einen Austritt von abgebautem Wirtscytoplasma verhindern, wenn das Wirtsplasmalemma teilweise zerstört wird. 2. Die Entwicklung der Zoosporen und die Bildung der Dauersporen wird beschrieben und in Hinblick auf die Identifizierung des Organismus diskutiert. 3. Im Cytoplasma einer Anzahl von Scenedesmus-Zellen, die mit Aphelidium infiziert waren, wurden stabförmige Partikel (Länge 35 nm, Durchmesser 10 nm) gefunden. Ihre (Virus?-) Natur wird diskutiert.
    Notes: Summary 1. Encysted Aphelidium zoospores penetrate the cell wall of the host, Scenedesmus armatus, and develop an endophytic, amoeboid protoplast which phagocytizes the host cytoplasm. The parasite plasmalemma forms compound membranes with parts of the host plasmalemma. These compound membranes may prevent an outflow of disintegrated host cytoplasm when the host plasmalemma is partly degenerated. 2. Zoospore development and resting spore formation are described and discussed with respect to the identification of the organism. 3. In the cytoplasm of a number of Aphelidium infected Scenedesmus cells rodlike particles (length 35 nm, diameter 10 nm) are found. Their (viral?) nature is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408983
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  • 8
    Electronic Resource
    Electronic Resource
    Development and ultrastructure of the marine, parasitic oomycete, Lagenisma coscinodisci Drebes (Lagenidiales) (1978)
    Springer
    Archives of microbiology 116 (1978), S. 141-150 
    Details
    ISSN: 1432-072X
    Keywords: Lagenisma ; Ultrastructure of the thallus ; Mitosis ; Meiosis ; Wall formation ; Discharge tube ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The thalli of Lagenisma coscinodisci are coenocytic. In young thalli each nucleus is associated with two procentrioles and four dictyosomes. Before nuclear division two pairs of procentrioles are found on two opposite poles each lying in a pocket of the nuclear membranes. The spindle microtubules radiate from these poles; the nuclear membrane remains completely closed in all divisional stages. The thallus transforms holocarpically into a zoosporangium. The differentiation begins after the breakdown of the host with the formation of a cell wall and with the development of a discharge tube. During these processes peripheral dilated tubules are observed which are in close, local contact with small infoldings of the plasmalemma. The discharge tube develops independent of the point of entry of the infection tube and enlarges by tip growth. There are several light and electron microscopical observations which suggest that the last nuclear divisions in zoosporangia of old cultures are meiotic. They give rise to sexually determined zoomeiospores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406029
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  • 9
    Electronic Resource
    Electronic Resource
    Einige elektronenmikroskopische Beobachtungen an Vacuolaria virescens Cienk. (1967)
    Springer
    Archives of microbiology 57 (1967), S. 196-198 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408701
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  • 10
    Electronic Resource
    Electronic Resource
    Elektronenmikroskopische Beobachtungen an Parasiten aus Scenedesmus-Massenkulturen (1971)
    Springer
    Archives of microbiology 75 (1971), S. 230-245 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Es wird gezeigt, daß ein chytridialer Parasit auf Scenedesmus, der ehemals für eine Phlyctidium-Art gehalten wurde, ein schwach verzweigtes Haustorium und ein Zoosporangium mit einem gut entwickelten Deckel hat. Er wird daher vorerst als ein Chytridium angesehen. Die Infektion der Wirtszelle, deren Reaktion, die Entwieklung des Zoosporangiums und die Feinstruktur der Zoosporen werden beschrieben. In unserem Material, das aus unsterilen Massenkulturen von Scenedesmus armatus stammt, sind einige Zoosporangien des Pilzes von Bakterien infiziert und zerstört.
    Notes: Summary It is shown that the chytridial parasite of Scenedesmus, which was formerly taken for a species of Phlyctidium, has a slightly branched haustorium and a zoosporangium with a well developed operculum. Therefore, it is regarded preliminarily as a Chytridium. The infection of the host cell, its reaction, the development of the zoosporangium and the fine structure of the zoospores are described. In our material, which was taken from nonsterile mass cultures of Scenedesmus armatus, several zoosporangia of Chytridium sp. had been infected and destroyed by bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408984
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