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  • 1985-1989  (4)
  • 1980-1984  (3)
  • 1920-1924  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Incidence of diabetes amongst people aged 18–50 years in nine British towns: A collaborative study (1982)
    Springer
    Diabetologia 22 (1982), S. 421-425 
    Details
    ISSN: 1432-0428
    Schlagwort(e): Incidence of Type 2 diabetes ; socio-economic environment ; social class
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The incidence of diabetes among people aged 18–50 years has been studied prospectively in nine towns, chosen to encompass the range of socioeconomic conditions and spread of latitude in England and Wales. The incidence of Type 1 (insulindependent) diabetes in this age group varied little between the towns. However, the incidence of Type 2 (non-insulin-dependent) diabetes was markedly higher in the towns with ‘worse’ socio-economic conditions. The mean incidences were 23 per 100000 for the three ‘worse’ towns and 10 per 100000 for the three ‘better’ towns. This was not explicable by an association between the disease and social class. This finding has to be reconciled with known and hypothesised influences in the aetiology of Type 2 diabetes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00282583
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  • 2
    Digitale Medien
    Digitale Medien
    Use of a Prismatic Binocular for Viewing Near Objects (1920)
    [s.l.] : Nature Publishing Group
    Nature 104 (1920), S. 532-532 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] A FEW years ago, with a view to the observation of close objects out of doors, I procured some glass adapter lenses for use on the object glass of the half of a prism binocular (× 12) which I carried about with me. Finding, however, that this method involved the use of several glass adapters, ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/104532e0
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  • 3
    Digitale Medien
    Digitale Medien
    Glomus tumours: a clinico-pathological survey (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental dermatology 5 (1980), S. 0 
    Details
    ISSN: 1365-2230
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Twenty-three cases of glomus tumours seen at the Dermatology out-patients of two hospitals are reported. Their principal clinical and histopathological features are recorded and the recent literature reviewed. The findings are compared with previously published accounts.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2230.1980.tb01692.x
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  • 4
    Digitale Medien
    Digitale Medien
    Plant gene expression in effective and ineffective root nodules of alfalfa (Medicago sativa) (1987)
    Springer
    Plant molecular biology 9 (1987), S. 469-478 
    Details
    ISSN: 1573-5028
    Schlagwort(e): in vitro translation ; leghemoglobin ; nodulin gene expression ; Northern analysis ; Rhizobium-alfalfa symbiosis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Expression of plant genes involved in the symbiosis between alfalfa (Medicago sativa) and Rhizobium meliloti has been studied by comparing root and root nodule mRNA populations. Two-dimensional gel electrophoretic separation of the in vitro translation products of polyA+ RNA isolated from either roots or effective root nodules has allowed us to identify thirteen nodule-specific translation products, including those corresponding to the leghemoglobins (Lb). These translation products, representing putative nodulin mRNAs, are first detected between 9 and 12 days after inoculation, a result which has been confirmed for Lb mRNA by Northern blotting and hybridization with a Lb cDNA probe. Analysis of three different types of ineffective root nodules arrested in different stages of development has led to the following conclusions. (i) The transcription of eleven nodule-specific genes, including the Lb genes, is independent of nitrogen-fixing activity. (ii) Differentiation of the primary nodule structure does not require the transcription of any of these genes but can be correlated with a dramatic reduction in the level of at least five transcripts present in the root. (iii) There is enhanced expression of certain plant genes in the case of nodules elicited by an Agrobacterium strain carrying the symbiotic plasmid of R. meliloti.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00015878
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  • 5
    Digitale Medien
    Digitale Medien
    Further studies on dynamic crack branching (1983)
    Springer
    Experimental mechanics 23 (1983), S. 431-437 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The newly derived dynamic-crack-branching criterion with its modifications is verified by the dynamicphotoelastic results of dynamic crack branchings in thinpolycarbonate, single-edged crack-tension specimens. Successful crack branching was observed in four specimens and unsuccessful branching in another. Crack branching consistently occurred when the necessary conditions ofK I =K I b =3.3 MPa $$\sqrt m$$ and the sufficiency condition ofr o =r c =0.75 mm were satisfied simultaneously. In the unsuccessful branching test, the necessary condition was not satisfied sinceK I was always less thanK I b .
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02330060
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  • 6
    Digitale Medien
    Digitale Medien
    Analysis of dynamic mixed-mode isochromatics (1985)
    Springer
    Experimental mechanics 25 (1985), S. 344-353 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The mixed-mode, elastodynamic state of stress in the neighborhood of a constant-velocity crack tip is used to generate numerically unsymmetric isochromatics. Unsymmetry associated with the third-order terms of a mixed-mode stress field, with and without the Mode II singular stress term, is also investigated. In extractingK I from an unsymmetric isochromatic pattern, errors in the Mode I fracture parameters due to the assumed presence ofK II in aK I stress field were found to be significant when data are taken more than 4 mm from the crack tip.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02321332
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  • 7
    Digitale Medien
    Digitale Medien
    DeterminingK and related stress-field parameters from displacement fields (1985)
    Springer
    Experimental mechanics 25 (1985), S. 399-407 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A general algorithm is presented that computes the stress-field parameters for opening-mode crack problems in a least-squares sense from full-field moiré or speckle-displacement fringe patterns. The algorithm can be used in the presence of rigid-body rotation and does not require absolute fringe numbering. Extensive numerical experiments were conducted with the algorithm to determine the sensitivity of the method to experimental errors. Small random position errors in locating the fringe maxima were found to have a negligible influence on the stress-intensity-factor calculation when the number of data points was about ten times greater than the number of unknown stress-field parameters. It was also found that systematic position errors due to an incorrectly specified crack-tip location could be minimized by assuming various crack-tip locations in the vicinity of the actual crack tip and selecting the best fit results. Bothu andv fields were found to be equally suitable for determination of the stress-intensity factor.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02321339
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  • 8
    Digitale Medien
    Digitale Medien
    Dynamic measurements of initiation toughness at high loading rates (1988)
    Springer
    Experimental mechanics 28 (1988), S. 298-303 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract An experimental method is described for measuring the dynamic initiation toughness of a sharp stationary crack. A plane specimen is utilized which consists of a central region 50-mm wide and 200-mm long with integral dog-bone ends. The loading is accomplished by the detonation of four small explosive charges which produce two tensile stress waves upon reflection from the dog-bone ends. The stress waves meet at the midpoint of the specimen and reinforce to produce a relatively large, uniformly stressed region with a very high loading rate. The crack is positioned at the midpoint of the specimen at the location where the reinforcing tensile stress waves meet. A series of photoelastic experiments were conducted using Homalite 100 as the model material to observe, in a full-field view, the arrival of the dilatational waves, the subsequent development of the stress field at the tip of the stationary crack and the initiation of the crack. The isochromatic fringe pattern was also used to determine the instantaneous value of the stress-intensity factorK(t) after the characteristic fringe loops developed in the region near the crack tip. Finally,K(t) was measured using a single strain gage positioned and oriented so that its signal output was proportional toK(t) and independent of the next two higher order terms in the series representation of the strain field. A method was developed to determine the instant of initiation from the strain-time trace. Results obtained from the photoelastic and strain measurements of the dynamic-initiation toughnessK ID were consistently higher than the static value ofK IC .
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02329026
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