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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Immunogenetics 24 (1986), S. 416-422 
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 147 (1987), S. 68-72 
    ISSN: 1432-072X
    Keywords: Differential sedimentation ; Synchronous cultures ; Bacillus subtilis ; Mean cell density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A simple rapid method for preparing synchronous cultures of Bacillus subtilis has been used to investigate changes in density during the cell cycle. Asynchronous cells separated on a stepped Percoll density gradient had a mean cell density of 1.117 g ml-1±0.004. Samples from a synchronous culture exhibited variation (ca. 1.5%) in mean cell density which was greatest at the onset of cell division. An asynchronous control culture showed little variation in density. These results are discussed in relation to previous work on Escherichia coli.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 14 (1987), S. 0 
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The purpose of the present investigation was to study the effect of age on the rate of development of gingival inflammation in individuals not susceptible to periodontal destruction. 7 younger (mean age 37 years) and 7 older (mean age 58 years) individuals were selected on the basis of the presence of at least 18 teeth, no evidence of extraction due to periodontal destruction, no loss of attachment, shallow pockets, gross amounts of plaque and a history of no interdental cleaning. All individuals were subjected to a carefully controlled oral hygiene program and experimental gingivitis was induced in 1 quadrant of the mouth during a period of 33 days. The amount of plaque, redness and swelling of the gingivitis, and bleeding on probing were assessed before, during and after the experiment. Al day 33, supra-gingival plaque samples were taken for bacteriological examination and gingival biopsies were taken for histopathological and immunohistochemical investigation. Results showed no differences between the 2 age groups with regard to the amount of plaque accumulation and the rate of development of gingival inflammation. Furthermore phase-contrast microscopy of plaque samples showed no differences between the 2 age groups. Neither his to-logical nor immunohistochemical investigation showed any differences between the 2 age groups. All biopsies diffusely showed presence of IgG, whereas in most biopsies, IgA plasma cells and in one biopsy IgM plasma cells were found. Neither IgD, IgE nor complement deposits were found. It was concluded that age is of minor importance in the development of experimentally-induced gingivitis in individuals not susceptible to periodontal destruction.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 13 (1986), S. 0 
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract In a recent publication, it was hypothesized that the ratio between bleeding and plaque scores may act as a prognostic indicator for periodontal breakdown. Furthermore, it was found that the rate of development of gingival inflammation in terms of bleeding on probing during experimental gingivitis is more rapid in patients susceptible to periodontal breakdown than in subjects insusceptible to periodontal breakdown. The purpose of the present investigation was to compare the gingival reaction to dental plaque in an experimental gingivitis study in individuals without periodontal breakdown, having either a low or a high bleeding/plaque ratio. A group of 8 volunteers (18–23 years) with a low bleeding/plaque ratio and 7 volunteers (19–22 years) with a high bleeding/ plaque ratio were selected. In both groups, an experimental gingivitis study of 23 days duration was carried out. Results showed that individuals with a high bleeding/plaque ratio developed significantly more clinical inflammation in terms of bleeding and swelling of the gingiva than individuals with a low bleeding/plaque ratio. After 23 days of plaque accumulation, gingival biopsies as well as supragingival plaque samples were taken from both groups. Phase-contrast microscopy of the plaque samples showed no significant differences between the 2 groups. Low %s of spirochetes and motile rods were found. Stereologic point-counting procedures snowed equal amounts of infiltrated connective tissue in both groups. However, significant differences in composition of the infiltrate appeared to be present. The high ratio group showed more IgA producing plasma cells and complement activation than the low ratio group. The results of the present study suggest that the bleeding/plaque ratio of an individual may be regarded as a prognostic indicator for the degree of experimentally induced gingival inflammation in terms of bleeding and swelling of the gingiva as well as complement activation and IgA-plasma cell activity.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 12 (1985), S. 0 
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The aim of the present study was to investigate the rate of development of experimentally-induced gingival inflammation in relation to the susceptibility to periodontal disease. By selection according to age, a younger (25–39 years) and an older (45–54 years) age group, with a comparable reduced but healthy periodontium, was selected. This equal amount of periodontal breakdown may suggest that the younger age group represented individuals with a relatively higher degree of susceptibility to periodontal disease. At the start of the experiment, each patient was instructed to abstain from oral hygiene procedures in 1 quadrant of the mouth for a period of 18 days. Results showed that all subjects developed signs of gingival inflammation. Regarding the development of redness and swelling, no differences could be assessed between the 2 age groups. However, analysis of the bleeding scores revealed that bleeding on probing developed more rapidly in the younger age group. It was concluded that those patients who have suffered from a more rapid form of periodontal disease also develop inflammation, in terms of bleeding on probing, more rapidly.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 73 (1988), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Net photosynthesis, concurrent carbon export and starch, sucrose and inorganic phosphorus concentrations were measured in leaves of white clover (Trifolium repens L. cv. Grasslands Huia) grown at four levels of phosphorus supply in the presence or absence of mineral nitrogen. The nitrogen treatments had no effect on growth, photosyntheis or carbon export. At the three higher levels of phosphorus supply, the amount of carbon exported was about 77% of net fixation. Photosynthesis and export per leaf decreased with phosphorus supply, primarily through the effect of phosphorus supply on leaf area. The rate of photosynthesis was reduced only at the lowest level of phosphorus supply.Inorganic phosphorus rose with phosphorus supply but starch concentration was unaffected. Sucrose was reduced at the lowest level of phosphorus supply but not significantly affected at higher levels. The ratio between starch and sucrose concentration was also unaffected at the higher levels, but was increased at the lowest level of supply. There thus appeared to be direct effects of phosphorus supply on photosynthesis, partitioning of carbon to carbohydrates and, by implication, export, only at the lowest level of phosphorus supply. As leaf area and plant growth were affected over the whole range of phosphorus supply, factors other than photosynthesis per se must have determined the response of growth to phosphorus supply.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 464 (1986), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Intensive care medicine 13 (1987), S. 81-82 
    ISSN: 1432-1238
    Keywords: Minitracheostomy ; Haemorrhage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Cricothyroid puncture in the process of minitracheostomy may encounter aberrant blood vessels and require surgical exploration.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of environmental contamination and toxicology 37 (1986), S. 774-782 
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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