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  • Electron microscopy  (117)
  • Springer  (117)
  • American Meteorological Society
  • International Union of Crystallography
  • Springer Nature
  • 1985-1989  (14)
  • 1975-1979
  • 1970-1974  (103)
  • 1960-1964
  • 1950-1954
  • 1988  (14)
  • 1974  (103)
  • 1953
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Verlag/Herausgeber
  • Springer  (117)
  • American Meteorological Society
  • International Union of Crystallography
  • Springer Nature
  • Wiley-Blackwell  (13)
Erscheinungszeitraum
  • 1985-1989  (14)
  • 1975-1979
  • 1970-1974  (103)
  • 1960-1964
  • 1950-1954
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Origin and direction of replication in mitochondrial plasmid DNAs of broad bean,Vicia faba (1988)
    Springer
    Current genetics 14 (1988), S. 163-170 
    Details
    ISSN: 1432-0983
    Schlagwort(e): Plant mtDNA ; Electron microscopy ; Restriction enzymes ; Hairpin structures
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Broad bean (Vicia faba) mitochondrial DNA (mtDNA) includes three circular plasmids: mt-plasmid 1 (1,704 ntp), mt-plasmid 2 (1,695 ntp) and mt-plasmid 3 (1,476 ntp). Partially replicated circular forms of these mt-plasmids have been observed in electron microscope preparations. Restriction enzymes that cleave either mt-plasmid 2 (but not mt-plasmids 1 and 3) or mt-plasmid 3 (but not mt-plasmids 1 and 2) were used to generate linear forms of partially replicated mt-plasmid 2 and mt-plasmid 3 molecules. Analyses of these linearized replicative intermediates, observed by electron microscopy, indicated that in both mt-plasmid 2 and mt-plasmid 3 replication originates at a specific location and proceeds in the same, single direction around the molecules. The replication origins of mt-plasmid 2 and mt-plasmid 3 map close to sequences that can fold into hairpin structures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00569340
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Scanning and transmission electron microscopy evidence of the cytological effect of pyrrolnitrin on ‘Microsporon audouinii’ Gruby CBS 313-54 ‘in vitro’ (1974)
    Springer
    Mycopathologia 53 (1974), S. 111-123 
    Details
    ISSN: 1573-0832
    Schlagwort(e): Microsporon audouinii ; Pyrrolnitrin ; Electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Scanning and transmission electron microscopy showed that a ceiling quantity (1.56 mcg) of antifungal antibiotic Pyrrolnitrin caused heavy damage to dermathophyteMicrosporon audouinii Gruby CBS 313-54in vitro. Suitable preparation technique made it clear that the changes involved consisted of hyphal collapse on the edge of the culture, with loss of euplasmic organelles identity and cell autolysis. The cell wall, however, was apparently undamaged. These findings fit in with the suggestion that the mode of action of the antibiotic leads to generalised lipoproteic membranes damage. They must, however, be considered as representing the result of the terminal phase of cell distress.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02127201
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  • 3
    Digitale Medien
    Digitale Medien
    Studies on dentinogenesis in the rat (1974)
    Springer
    Calcified tissue international 16 (1974), S. 93-107 
    Details
    ISSN: 1432-0827
    Schlagwort(e): Dentinogenesis ; Globules ; Pyrophosphatase ; Calcification ; Electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Notizen: Abstract Three-day-old rats were fixed by perfusion with glutaraldehyde and thin slices were cut of the first molar germs. The slices were treated with EDTA and “activated” with buffered solutions containing Mg2+, Ca2+ or Zn2+. Incubation was carried out in buffered solutions (pH 8.5) containing inorganic pyrophosphate and Pb2+. In the Mg2+-activated specimens incubation products were localized to the plasma membranes in the stratum intermedium and the subodontoblastic area. Lead deposits were found on the periphery of the dentinal globules. Incubation products were more randomly distributed in Ca2+-activated specimens whereas those activated with Zn2+ displayed a deposition of lead precipitates mainly corresponding to that seen after activation with Mg2+. The findings are discussed in reference to the localization of alkaline phosphatase in the dentin-producing tissues and it is proposed that the results are indicative of the presence of an inorganic pyrophosphatase in these tissues.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02008216
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  • 4
    Digitale Medien
    Digitale Medien
    Acid phosphatase in the mantle of the shell-regenerating snailHelisoma duryi duryi (1974)
    Springer
    Calcified tissue international 15 (1974), S. 213-220 
    Details
    ISSN: 1432-0827
    Schlagwort(e): Acid phosphatase ; Electron microscopy ; Shell Regeneration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Notizen: Abstract Acid phosphatase activity was mainly localized in the lysosomes in all the regions of the outer epithelium. The transitional portion of the outer epithelium showed more intense activity than the other regions. During shell regeneration the activity of this portion decreased to a minimum level at 12 hours and was restored to normal at 72 hours. The other regions showed no change of activity during shell regeneration. It is postulated that the acid phosphatase in the transitional protion is responsible for conferring calcifiability to the organic matrix of the shell.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02059058
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  • 5
    Digitale Medien
    Digitale Medien
    Immunocytochemical localization of two key enzymes of the 2-hydroxyglutarate pathway of glutamate fermentation in Acidaminococcus fermentans (1988)
    Springer
    Archives of microbiology 150 (1988), S. 504-508 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Acidaminococcus fermentans ; Glutamate fermentation ; Electron microscopy ; Immunocytochemistry ; Post-embedding labelling ; Antibody-gold complexes ; Protein A-gold complexes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract We have investigated the in situ location of glutaconyl-CoA decarboxylase and 2-htdroxyglutaryl-CoA dehydratase in Acidaminococcus fermentans using the antibody-gold and protein A-gold techniques carried out as a post-embedding immunoelectron microscopic procedure. Polyclonal antisera were raised in rabbits against homogeneous fractions of the enzymes. Anaerobically grown cells of A. fermentans of the late exponential growth phase were fixed with 0.2% glutaraldehyde and 0.3% formaldehyde (final concentrations) in the growth medium. Dehydration of the cells was achieved with methanol. The cells were embedded in the low temperature embedding resin Lowicryl K4M. The markers indicative for antigenic sites of the two enzymes unequivocally demonstrate that the sodium pump glutaconyl-CoA decarboxylase is located at the cell periphery being a membrane-bound enzyme as expected whereas 2-hydroxyglutaryl-CoA dehydratase is a soluble cytoplasmic enzyme.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00422295
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    The production and utilization of intermediary elemental sulfur during the oxidation of reduced sulfur compounds by Thiobacillus ferrooxidans (1988)
    Springer
    Archives of microbiology 150 (1988), S. 574-579 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Thiobacillus ferrooxidans ; Sulfur production ; Sulfur oxidation ; Inhibitors ; Uncouplers ; Electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The intermediary production of elemental sulfur during the microbial oxidation of reduced sulfur compounds has frequently been reported. Thiobacillus ferrooxidans, an acidophilic chemolithoautotroph, was found to produce an insoluble sulfur compound, primarily elemental sulfur, during the oxidation of thiosulfate, trithionate, tetrathionate and sulfide. This was confirmed by light and electron microscopy. Sulfur was produced from sulfide by an oxidative step, while the production from tetrathionate was initiated by a hydrolytic step, probably followed by a series of chemical reactions. The oxidation of intermediary sulfur was severely inhibited by sulfhydryl-binding reagents such as N-ethylmaleimide, by the addition of uncouplers or after freezing and thawing of the cells, which probably damaged the cell membrane. The mechanisms behind these inhibitions have not yet been clarified. Finally, it was observed that elemental sulfur oxidation by whole cells depended on the medium composition. The absence of sulfate or selenate reduced the sulfur oxidation rate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408252
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  • 7
    Digitale Medien
    Digitale Medien
    Structure of the mitochondrial genome of Beta vulgaris L. (1988)
    Springer
    Theoretical and applied genetics 76 (1988), S. 753-759 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Plant mitochondrial genome ; Minicircle DNA ; Electron microscopy ; Beta vulgaris L.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The structure of mitochondrial DNA (mt-DNA) from sugarbeet (Beta vulgaris L.) has been studied by biochemical methods and electron microscopy. It was found to be complex multipartite consisting of two main classes of molecules: high molecules weight (HMW) mtDNA and low molecular weight (LMW) mtDNA. The HMW mtDNA consists of rosette-like structures and globules resembling chromomeres (150–200nm). A typical rosette has a protein core and radially stemming closed DNA loops (from 0.6-1.5 μm). The number of loops in a rosette varies from 16–30. The bulk of HMW mtDNAs are represented by interconnected rosettes (total contour length about 130–160 μm, 403–496 kbp). Such large circular DNAs may be evidence of the master chromosome arrangement of the sugarbeet genome. Globules and rosettes are interconnected by thick and thin DNA fibrils, along which nucleosome- and nucleomere-like structures are distributed. The LWM mtDNA is composed of two groups of supercoiled circular molecules, 0,2–1.5 μm and 0.02–0.05 μm in size. Electrophoretic analysis demonstrated that LWM mtDNA is represented by minicircle plasmid-like DNA molecules of 1.3, 1.4 and 1.6 kbp.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00303522
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  • 8
    Digitale Medien
    Digitale Medien
    Distribution of mitochondrial plasmid-like DNA in cultivated rice (Oryza sativa L.) and its relationship with varietal groups (1988)
    Springer
    Theoretical and applied genetics 76 (1988), S. 809-814 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Electron microscopy ; Genetic variation ; Mitochondrial DNA ; Oryza sativa L. ; Plasmid-like DNA
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Mitochondrial (mt) plasmid-like DNA was found in most of more than 100 rice cultivars (Oryza sativa L.) by the use of 0.7% agarose gel electrophoresis (AGE). The DNA varied in molecular weight and number. By electron microscopy, small circular DNAs of different sizes could be detected in addition to the DNAs of high molecular weight, even in cultivars in which mt plasmid-like DNA was not detected by AGE. The detection of the mt plasmid-like DNAs by AGE did not depend on their presence or absence, but on their high stoichiometry. The relationship between cytoplasms with mt plasmid-like DNAs and varietal (for example, Indica rice) groups was close. The geographical distribution of cytoplasms is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00273665
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  • 9
    Digitale Medien
    Digitale Medien
    The ninth retinula cell in the ommatidium of the worker honey bee (Apis mellifica L.) (1974)
    Springer
    Cell & tissue research 147 (1974), S. 589-593 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Ommatidium ; Apis mellifica ; Ninth retinula cell ; Electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Das Rhabdom im Ommatidium der Arbeitsbiene wird von 9 Retinulazellen aufgebaut. Die exzentrische Zelle = Zelle Nr. 9 (ca. 50–75 μ lang) liegt im distalen Bereich des Ommatidiums, unterhalb der Zelle Nr. 4 (nach Varela und Porter, 1969), die ihrerseits den Rhabdomverband verläßt und als Axon zur Basalmembran zieht.
    Notizen: Summary The rhabdom in the ommatidium of the worker honey bee is built up of 9 retinula cells. The eccentric cell = cell No. 9 (approx. 50–75 μ long) is situated in the distal region of the ommatidium beneath the fourth cell (numbered according to Varela and Porter, 1969), which in its turn leaves the rhabdom and runs as an axon towards the basement membrane.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00307257
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  • 10
    Digitale Medien
    Digitale Medien
    Ciliogenesis and ciliary anomalies in thymic cysts of “nude” mice (1974)
    Springer
    Cell & tissue research 148 (1974), S. 397-406 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Thymus ; “Nude” mouse ; Ciliogenesis ; Ciliary anomalies ; Electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The thymus of the “nude” mouse is composed of ciliated cysts. In the adult mouse, different steps of ciliogenesis can be observed. The ciliated cells exhibit several anomalies in the centriole and in the cilium itself; the most important ones are the half-centriole and the compound cilia. An explanation for the occurrence of frequent anomalies in ciliated cells is suggested. Finally, some single cilia are described in fat cells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00224266
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