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  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of the intrinsic competitiveness and saprophytic competence of Rhizobium tropici IIB strains (1997)
    Springer
    Biology and fertility of soils 24 (1997), S. 274-282 
    Details
    ISSN: 1432-0789
    Keywords: Key words Competitiveness ; Genetic exchange ; Rhizobium etli ; Rhizobium tropici IIB ; Saprophytic ; competence ; Symbiotic nitrogen fixation ; Nodule population
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Inoculation of beans (Phaseolus vulgaris L.) with strains of R. tropici IIB and R. etli resulted in the disappearance of the R. tropici IIB stains from the nodule population and their replacement by other (non R. tropici IIB) bean symbionts (Vlassak et al. 1996). Coinoculation studies in monoxenic conditions and in soil core microcosms with plants harvested at two different growth stages indicated that the inoculated R. tropici IIB strains CIAT899 and F98.5 possess a good intrinsic competitiveness which declines, however, at a later plant growth stage and in soil conditions. The poor saprophytic competence of R. tropici IIB strain CIAT899 was further demonstrated by its poor survival in soil core microcosms after bean harvest. Strains were isolated from the field plots with a 3-year bean-planting history, characterized and evaluated for their competitiveness against R. tropici IIB strain CIAT899. Isolates from field plots, which had been repeatedly inoculated with R. tropici IIB strain CIAT899, showed a higher nodule occupancy compared to R. tropici IIB strain CIAT899, and this higher competitiveness exhibited by the field isolates might be an additional reason for the poor performance of R. tropici IIB strain CIAT899 in the field study. Plots with and without a history of bean production revealed after 3-year bean cultivation an almost totally different population that also significantly differed in competitiveness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050243
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of angles in O-H...O hydrogen-bonded complexes in solution from the best correlation between the dipole increment and the enthalpy of the bond (1980)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 84 (1980), S. 2740-2748 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100458a015
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  • 3
    Electronic Resource
    Electronic Resource
    Dipole moments and complexation enthalpies of 1-methyl and 1,2-dimethylimidazole with various phenols in benzene solution. Angle between the moment of the bases and the hydrogen bond (1980)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 84 (1980), S. 2748-2751 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100458a016
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  • 4
    Electronic Resource
    Electronic Resource
    A 5-year prospective randomized clinical trial on the influence of splinted and unsplinted oral implants retaining a mandibular overdenture: prosthetic aspects and patient satisfaction (1999)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 26 (1999), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Prosthetic outcome and patient satisfaction were evaluated in order to investigate whether there is a need or advantage to splint two implants in the mandible retaining a hinging overdenture. This study included 36 fully edentulous patients randomly divided into three groups according to the attachment system they received: magnets, ball attachments or straight bars (reference group). None of the implants failed during the whole observation period in any of the groups. After 5 years of observation, the Bar group presented the highest retention capacity and the least prosthetic complications but revealed more mucositis and gingival hyperplasia. Patient satisfaction rated similar for all groups although the Magnet group showed lower retention forces. All patients would repeat the same treatment even though the majority of the Magnet group would prefer a more retentive solution because of limited denture stability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.1999.00369.x
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  • 5
    Electronic Resource
    Electronic Resource
    The possibility of measuring plaque growth in vivo within 24 hours (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 20 (1985), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The utility of a planimetric method for measuring in vivo plaque growth on teeth within 24 hours was tested. A reproducible photographic technique was developed. With this technique color slides were made after plaque disclosure with neutral red 0.5% and enlarged up to 25 times natural size for tracing on paper. The percentage of tooth surface covered by plaque was calculated with a planimeter. To obtain a stable and interpretable staining of the plaque three dye applications were applied. The interpretation of the slides was only reproducible when the slides were examined the same day and with the use of a tooth outline. Under these conditions an intra-examiner correlation coefficient of 0.999 was found. Furthermore, it was possible to detect significant differences in rate of plaque growth between two subjects within a time interval of four hours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1985.tb00441.x
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  • 6
    Electronic Resource
    Electronic Resource
    A randomised clinical trial on the influence of splinted and unsplinted oral implants in mandibular overdenture therapy (1997)
    Springer
    Clinical oral investigations 1 (1997), S. 81-88 
    Details
    ISSN: 1436-3771
    Keywords: Key words Splinted/unsplinted implants ; Mandible ; Overdenture ; Patient satisfaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A randomised clinical trial was performed to investigate whether there is a need or advantage to splint two implants in the mandible retaining a hinging overdenture. Furthermore, patient satisfaction was evaluated for different attachment systems retaining the overdenture. Thirty-six edentulous patients were randomised into three groups of equal size and treated with either magnets, ball attachments or straight bars (reference group). After 3 years of observation no implants were lost in any of the groups. Besides, no statistically significant differences were noted for the peri-implant outcome. Although the bar group presented the highest retention force, the general satisfaction of the patients in the three groups did not differ. The patients with bar retentions showed less prosthetic complications of the retention elements but more at the level of the denture-supporting mucosa. Finally, the clinical outcome of all groups confirms that overdenture treatment demands regular controls with limited time intervals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007840050016
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  • 7
    Electronic Resource
    Electronic Resource
    Two high-density AFLP® linkage maps of Zea mays L.: analysis of distribution of AFLP markers (1999)
    Springer
    Theoretical and applied genetics 99 (1999), S. 921-935 
    Details
    ISSN: 1432-2242
    Keywords: Key words Zea mays L. ; AFLP® ; Methylation AFLP® ; Genetic map ; DNA methylation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  This study demonstrates the relative ease of generating high-density linkage maps using the AFLP® technology. Two high-density AFLP linkage maps of Zea mays L. were generated based on: (1) a B73 × Mo17 recombinant inbred population and (2) a D32 × D145 immortalized F2 population. Although AFLP technology is in essence a mono-allelic marker system, markers can be scored quantitatively and used to deduce zygosity. AFLP markers were generated using the enzyme combinations EcoRI/MseI and PstI/MseI. A total of 1539 and 1355 AFLP markers have been mapped in the two populations, respectively. Among the mapped PstI/MseIAFLP markers we have included fragments bounded by a methylated PstI site (mAFLP markers). Mapping these mAFLP markers shows that the presence of C-methylation segregates in perfect accordance with the primary target sequence, leading to Mendelian inheritance. Simultaneous mapping of PstI/MseIAFLP and PstI/MseI mAFLP markers allowed us to identify a number of epi-alleles, showing allelic variation in the CpNpG methylation only. However, their frequency in maize is low. Map comparison shows that, despite some rearrangements, most of the AFLP markers that are common in both populations, map at similar positions. This would indicate that AFLP markers are predominantly single-locus markers. Changes in map order occur mainly in marker-dense regions. These marker-dense regions, representing clusters of mainly EcoRI/MseI AFLP and PstI/MseI mAFLP markers, co- localize well with the putative centromeric regions of the maize chromosomes. In contrast, PstI/MseImarkers are more uniformly distributed over the genome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051399
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  • 8
    Electronic Resource
    Electronic Resource
    Prediction of testcross means and variances among F3 progenies of F1 crosses from testcross means and genetic distances of their parents in maize (1998)
    Springer
    Theoretical and applied genetics 96 (1998), S. 503-512 
    Details
    ISSN: 1432-2242
    Keywords: Key words Zea mays L ; AFLP ; RFLP ; Testcross mean ; Testcross variance ; Genetic distance ; Midparent heterosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Prediction of the means and genetic variances in segregating generations could help to assess the breeding potential of base populations. In this study, we investigated whether the testcross (TC) means and variances of F3 progenies from F1 crosses in European maize can be predicted from the TC means of their parents and F1 crosses and four measures of parental genetic divergence: genetic distance (GD) determined by 194 RFLP or 691 AFLPTM 1 markers, mid-parent heterosis (MPH), and absolute difference between the TC means of parents (∣P1−P2∣). The experimental materials comprised six sets of crosses; each set consisted of four elite inbreds from the flint or dent germplasm and the six possible F1 crosses between them, which were evaluated for mid-parent heterosis. Testcross progenies of these materials and 20 random F3 plants per F1 cross were produced with a single-cross tester from the opposite heterotic group and evaluated in two environments. The characters studied were plant height, dry matter content and grain yield. The genetic distance between parent lines ranged between 0.17 and 0.70 for RFLPs and between 0.14 and 0.57 for AFLPs in the six sets. Testcross-means of parents, F1 crosses, and F3 populations averaged across the six crosses in a particular set generally agreed well for all three traits. Bartlett’s test revealed heterogeneous TC variances among the six crosses in all sets for plant height, in four sets for grain yield and in five sets for dry matter content. Correlations among the TC means of the parents, F1 crosses, and F3 populations were highly significant and positive for all traits. Estimates of the TC variance among F3 progenies for the 36 crosses showed only low correlations with the four measures of parental genetic divergence for all traits. The results demonstrated that for our material, the TC means of the parents or the parental F1 cross can be used as predictors for the TC means of F3 populations. However, the prediction of the TC variance remains an unsolved problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050767
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  • 9
    Electronic Resource
    Electronic Resource
    Further characterization of AFLP® data as a tool in genetic diversity assessments among maize (Zea mays L.) inbred lines (2000)
    Springer
    Molecular breeding 6 (2000), S. 265-276 
    Details
    ISSN: 1572-9788
    Keywords: AFLP® ; genetic diversity ; methylation AFLP® ; polymorphism information content ; maize
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract AFLP® markers generated by CNG methylation sensitive (PstI/MseI) and CNG methylation insensitive (EcoRI/MseI) enzyme combinations and AFLP markers collected from hypomethylated (PstI/MseI) and hypermethylated (m PstI/MseI) regions were compared for their polymorphism information content, sampling variance and patterns of genetic diversity in a representative sample of 33 inbred lines of maize (Zea mays L.). We demonstrate that the mean polymorphism information content generated by sets of PstI/MseI and m PstI/MseI markers (0.38) is significantly higher than by sets ofEcoRI/MseI markers (0.33). Also the sampling variance highlighted the distinctive nature of the (m) PstI/MseI markers: to achieve a mean standard deviation of 5% in the estimation of genetic distance among the 33 inbreds, the PstI/MseI and m PstI/MseI marker sets (135 and 129 markers, respectively) are clearly smaller than the EcoRI/MseI marker set (173 markers). A further minimizing of the sampling variance of AFLP data in the estimation of genetic similarities was obtained by reducing marker information redundancy by selecting markers evenly distributed over each chromosome: a set of only 106 AFLP markers, sampled conditionally on their genetic map position, was required for a mean standard deviation of 5% in the estimation of genetic distance among the 33 inbreds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009656422272
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