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  • 1985-1989  (9)
  • 1980-1984  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Recombinant congenic strains — A new tool for analyzing genetic traits determined by more than one gene (1986)
    Springer
    Immunogenetics 24 (1986), S. 416-422 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377961
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  • 2
    Electronic Resource
    Electronic Resource
    Buoyant density fluctuations during the cell cycle of Bacillus subtilis (1987)
    Springer
    Archives of microbiology 147 (1987), S. 68-72 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00492907
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental gingivitis in relation to age in individuals not susceptible to periodontal destruction (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 14 (1987), S. 0 
    Details
    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
    URL: http://dx.doi.org/10.1111/j.1600-051X.1987.tb00990.x
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  • 4
    Electronic Resource
    Electronic Resource
    Bleeding/plaque ratio and the development of gingival inflammation (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 13 (1986), S. 0 
    Details
    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
    URL: http://dx.doi.org/10.1111/j.1600-051X.1986.tb00881.x
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental gingivitis in relation to susceptibility to periodontal disease (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 12 (1985), S. 0 
    Details
    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
    URL: http://dx.doi.org/10.1111/j.1600-051X.1985.tb01354.x
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  • 6
    Electronic Resource
    Electronic Resource
    Relation between wound healing after surgery and susceptibility to periodontal disease (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 11 (1984), S. 0 
    Details
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract. In the present investigation wound healing was studied clinically in 8 younger (mean age 33.5 years) and 8 older patients (mean age 48 years), who were surgically treated for the same amount of severe periodontitis. This implies that the patients in the younger age group represented individuals with a higher degree of susceptibility to periodontal disease than the patients in the older age group. After surgery all patients were subjected to a carefully controlled oral hygiene program. Patients were recalled weekly until 8 weeks post surgery and again after 15 weeks for a final examination. At every recall session oral hygiene measurements were carried out and the bleeding tendency of the pockets was determined after probing with a standardized pressure. Bleeding on the basis of mechanical trauma after probing was considered to be a clinical parameter for wound healing in a plaque free environment.Results indicate that the oral hygiene program resulted in equally low plaque scores in both age groups. However, in a period from 5–15 weeks after surgery younger patients showed significantly more bleeding pockets than older patients. Furthermore it was found in both groups that the more loss of attachment there was, the slower the rate of wound healing.It was concluded that the time span for wound healing is longer in patients who are more susceptible to periodontal disease, than in those who are less susceptible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-051X.1984.tb02212.x
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  • 7
    Electronic Resource
    Electronic Resource
    Photosynthesis and carbon export in white clover plants grown at various levels of phosphorus supply (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 73 (1988), S. 0 
    Details
    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
    URL: http://dx.doi.org/10.1111/j.1399-3054.1988.tb09191.x
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  • 8
    Electronic Resource
    Electronic Resource
    Leaf phosphorus fractionation and growth responses to phosphorus of the forage legumes Trifolium repens, T. dubium and Lotus pedunculatus (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 61 (1984), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: ‘Grasslands Huia’ white clover (Trifolium repens L.), ‘Grasslands Maku’ lotus (Lotus pedunculatus Cav.) and suckling clover (T. dubium Sibth) were grown in a controlled environment at various levels of P supply. Dry weights and the concentration of inorganic-, lipid-, ester- and residual-P in trifoliate leaves were measured. Lotus grew better than white or suckling clover at low P. White clover and lotus responded steeply to increased P and had similar shoot dry weights at high P. Suckling clover had lower shoot weights than the other species at all P levels. The superior growth of lotus at low levels of p was probably due to better root growth and P uptake. Lotus had higher shoot P concentrations at low levels of P but lower concentrations than the others at high levels. White clover and suckling clover had similar shoot P concentrations at all levels of supply. In white and suckling clover total leaf P concentration rose with P supply. Of the P fractions, inorganic-and residual-P showed the largest rises in concentration. The increases in lipid- and ester-P were smaller. Increases in lotus leaf P were small, primarily because of the relatively small rises in inorganic- and residual-P. White clover is a vigorous species but requires high levels of P for best growth. Suckling clover has a relatively small response to improvements in P availability. The behaviour of the various P fractions is similar to that in white clover. Lotus grows well at low P but also shows rapid growth at high P supply. Whether efficiency is defined as the ability to extract P from the environment or to maintain low internal P concentration, lotus makes efficient use of P over the whole range of P supply.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1984.tb06352.x
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  • 9
    Electronic Resource
    Electronic Resource
    Plasma Hormones in Premenopausal Women with Benign Breast Disease (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 464 (1986), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1986.tb16074.x
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of training and probing force on the reproducibility of pocket depth measurements (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 17 (1982), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The purpose of the present investigation was to study the effect of standardization of probing spot and direction of probe insertion into the pocket in conjunction with a probing force of 0.75 N on the reproducibility of pocket depth measurements. Nine patients were selected on the basis of about 50 % loss of alveolar bone support. After initial treatment 137 interproximal pockets were measured twice by three different examiners, successively by means of a pressure probe with a constant probing force of 0.75 N and a Merritt-B probe. During the next two weeks the examiners were trained by means of a video program to use the probe on a standardized spot and in a standardized direction of insertion into the pocket. After this training, all measurements were repeated in the same order of investigation. During the first as well as the second examination, the first examiner also scored bleeding on probing using the pressure probe. Analyses of variance were carried out in order to test the reproducibility of pocket depth measurements both before and after training. Possible influences of the depth of the pocket and the bleeding tendency of a pocket were included in the analyses. The results indicated that only a training program together with a standardized probing force leads to reproducible interproxima! pocket depth measurements. However, further analyses revealed that only non-bleeding pockets gave reproducible measurements whereas bleeding pockets did not. If, in addition, pocket depth was included in the analyses, it was found that this factor has no influence on the reproducibility. It was concluded that bleeding of a pocket seems to be more important for the reproducibility of pocket depth measurements than the factor pocket depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1982.tb01149.x
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