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  • 1
    Electronic Resource
    Electronic Resource
    The Electron Microscopy of Sarcocystis miescheriana Kuhn 1865 (1960)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 7 (1960), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Ultrathin sections of Sarcocystis miescheriana were studied in the electron microscope. The banana-shaped body of the parasite shows a polar ring with a conoid at the anterior conical pole similar to that of S. tenella. Twenty-two fine fibrils arise from the polar ring passing radially in the pellicle. The anterior third of the cell is filled with sarconemes converging in the conoid. Behind their ends in the center of the cell large osmiophilic central granules can be seen. A large nucleus in the posterior third with a double membrane contains small chromatin granules situated peripherally. Around the nucleus and in the posterior part of the body numerous small vacuoles with osmiophilic walls, as well as mitochondria are observed. The pellicle consists of 2 layers. On the control preparations cytochemical reactions on ribonucleic acid, deoxyribonucleic acid, polysaccharides, glycogen, volutin and fats were performed. The surface of the cyst is covered by a thin layer showing a honey-comb structure giving rise to a great amount of parallel finger-like villi surrounding the cyst on all sides. The villi contain many very fine double-fibrils ending at the bases of villi in the finely granulated plasmatic interior cyst wall which forms also the septa of compartments. The functions of the observed organelles and structures are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1960.tb00719.x
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  • 2
    Electronic Resource
    Electronic Resource
    Physiological activity of immobilized cells of Claviceps fusiformis during long-term semicontinuous cultivation (1987)
    Springer
    Applied microbiology and biotechnology 26 (1987), S. 219-226 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The 550-day semicontinuous cultivation of Claviceps fusiformis immobilized in calcium alginate is documented. The vegetative mycelium from seed or from early-production submerged culture is the best choice for immobilization. No extracellular glucans are produced by immobilized cells. Immobilized spores give low yields of clavine alkaloids. Alginate concentrations in a range of 2%–4% do not influence yield and spectrum of alkaloids. The cytoplasm of the immobilized cells becomes condensed (after 3 days), polysaccharides disappear, and centres of lipid synthesis are formed in the cytoplasm. After 60 days the cells harbour a great number of lipid particles, mitochondria are diminishing and their cristae partly disappear, indicating a decreased respiration capacity. After 350–500 days the volume of most cells is increased many times and the cells are filled with large oval bodies of electrondense material. Chloramphenicol protects immobilized cultures against bacterial contamination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00286312
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructure of an extreme thermophilic hydrogen-oxidizing bacterium Calderobacterium hydrogenophilum (1994)
    Springer
    Archives of microbiology 162 (1994), S. 267-271 
    Details
    ISSN: 1432-072X
    Keywords: Extremely thermophilic eubacterium ; Calderobacterium hydrogenophilium ; Ultrastructure ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Calderobacterium hydrogenophilum is an extreme thermophilic, obligately chemoautotrophic, hydrogen-oxidizing bacterium. The cells were shown to be nonmotile straight rods of average size 0.4x2.5 μm. After negative-staining of the whole cells, no flagella were observed. The multilayered cell wall was of type 1 and possessed a crystalline proteinaceous surface layer exhibiting p4 symmetry. The square unit cells had a lattice constant of approximately 11 nm. Cell division occurred by a constriction mechanism. C. hydrogenophilum differred from a similar hydrogen-oxidizing eubacterium, Hydrogenobacter thermophilus, by the absence of intracytoplasmic membrane structures in chemically fixed cells. However, an electron-dense intracytoplasmic hemispherical structure adhering to the inner membrane was frequently observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00301849
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrastructure of an extreme thermophilic hydrogen-oxidizing bacterium Calderobacterium hydrogenophilum (1994)
    Springer
    Archives of microbiology 162 (1994), S. 267-271 
    Details
    ISSN: 1432-072X
    Keywords: Key words     Extremely thermophilic eubacterium ; Calderobacterium hydrogenophilium ; Ultrastructure ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract       Calderobacterium hydrogenophilum is an extreme thermophilic, obligately chemoautotrophic, hydrogen-oxidizing bacterium. The cells were shown to be non-motile straight rods of average size 0.4 × 2.5 μm. After negative-staining of the whole cells, no flagella were observed. The multilayered cell wall was of type 1 and possessed a crystalline proteinaceous surface layer exhibiting p4 symmetry. The square unit cells had a lattice constant of approximately 11 nm. Cell division occurred by a constriction mechanism. C. hydrogenophilum differred from a similar hydrogen-oxidizing eubacterium, Hydrogenobacter thermophilus, by the absence of intracytoplasmic membrane structures in chemically fixed cells. However, an electron-dense intracytoplasmic hemispherical structure adhering to the inner membrane was frequently observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00301849
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  • 5
    Electronic Resource
    Electronic Resource
    Ultrastructure of Bacillus pulvifaciens (1993)
    Springer
    Archives of microbiology 159 (1993), S. 114-118 
    Details
    ISSN: 1432-072X
    Keywords: Bacillus pulvifaciens ; Vegetative cells ; Spotes ; Ultrastructure ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ultrastructure of vegetative cells and spores of Bacillus pulvifaciens was studied by CTEM and SEM methods. The vegetative cells are rods, 1.6–4.5 μm long and 0.4–0.6 μm wide, exhibiting typical ultrastructural features of Gram-positive bacteria. The spores are of ellipsoidal shape, 0.6×1.2 μm in size, with six longitudinal ribs reaching up to 130 nm in height. There are satelite ribs on both sides of the longitudinal ribs, reaching up to 20 nm in height. Between the longitudinal ribs, additional transversal ribs were observed in SEM. A special tubular layer, separating the outer and inner coat of the spores, was revealed in ultrathin sections. This layer seems to be a typical ultrastructural feature of Bacillus pulvifaciens spores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00250269
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  • 6
    Electronic Resource
    Electronic Resource
    Oberflächenstrukturen des Scutums von Ixodes ricinus (1954)
    Springer
    Parasitology research 16 (1954), S. 241-252 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung 1. Es wird eine einfache Methode zur Herstellung von Repliken der Oberflächenstrukturen des Schildes der Zecke beschrieben. 2. Mittels dieser Methode verarbeiteten wir mehr als 80 Zecken der Art Ixodes ricinus, Imagines beider Geschlechter, hungrige und angesaugte aus verschiedenen Lokalitäten der ČSR und Rumänien. Sie stammten von verschiedenen Wirten. 3. Die hexagonale Mikrostruktur des Scutums erwies sich als ein spezifisches Kennzeichen für die Art Ixodes ricinus. Diese hexagonale Struktur bildet auf dem Schilde verschiedene Zeichnungen, welche sich ebenfalls als ganz konstant erwiesen. 4. Weiter wurden die Verbreitung, Anzahl und Morphologie der dermalen Sensillen, die auf dem Scutum münden, beobachtet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00260474
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  • 7
    Electronic Resource
    Electronic Resource
    Die Silberfibrillenstruktur bei Toxoplasma gondii und Sarcocystis tenella (1959)
    Springer
    Parasitology research 19 (1959), S. 311-314 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00260217
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  • 8
    Electronic Resource
    Electronic Resource
    Netropsin suppresses the rise of activity of an intracellular proteolytic system in sporulatingBacillus megaterium (1993)
    Springer
    Current microbiology 26 (1993), S. 287-292 
    Details
    ISSN: 1432-0991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Intracellular catabolism of proteins labeled at the end of the exponential growth proceeded in two phases during sporulation. The first phase was induced by starvation and took place also in cells whose sporulation was inhibited by netropsin. The second phase of degradation, which was triggered at the onset of the irreversible sporulation phase, was inhibited by netropsin. Intracellular proteolytic activity determined in disintegrated cells, i.e., primarily the activity of the cytoplasmic Ca2+-dependent serine proteinase(s) at the first place, was increasing throughout the sporulation process and reached its maximum during the irreversible sporulation phase. Its increase was suppressed by netropsin. Fractionation of the cell sap by HPLC revealed a similar distribution of proteolytic activities in the extract from control and netropsin-inhibited cells. The antibiotic thus probably affected the activation, not the formation of the cytoplasmic serine proteinase(s). Netropsin also inhibited an increase of proteolytic activity in the membrane fraction, probably owing to the presence of two different proteolytic enzymes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575919
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  • 9
    Electronic Resource
    Electronic Resource
    Cell structure and reproduction process in the Blue-Green algaChamaesiphon (1982)
    Springer
    Plant systematics and evolution 139 (1982), S. 267-277 
    Details
    ISSN: 1615-6110
    Keywords: Cyanophyceae ; Chamaesiphonales ; Chamaesiphon ; Ultrathin sections ; cell wall ; cell structures ; cell division ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ultrathin sections were studied in 2 strains and 2 samples from the nature of the genusChamaesiphon, representing 4 different species. Thylakoids are distributed mainly on the periphery of the cells, the cell-wall is probably 2-layered, and variable multilayered mucilaginous envelopes are developed around the cells. The cell division starts, as well as in otherCyanophyceae, by the invagination of the cytoplasmic membrane and of cell-wall layers into the protoplast; the mucilaginous envelopes—pseudovaginae—do not participate in this process but they form only the firm sheaths around the cells. The way of reproduction is, therefore, essentially the same as that described in other chroococcal Blue-Green algae (e.g.,Synechococcus), and the main difference is the polarized growth of theChamaesiphon cells. The taxonomical position of chamaesiphonoid algae is not as isolated as it was earlier supposed, the similarity withEntophysalidaceae is evident.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989329
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  • 10
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    Many tasks, but what is common for all of them? (2020)
    Springer
    Details
    Publication Date: 2020-06-15
    Print ISSN: 1432-8488
    Electronic ISSN: 1433-0768
    Topics: Chemistry and Pharmacology
    Published by Springer
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