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  • 1
    Electronic Resource
    Electronic Resource
    Diabetic glomerulopathy in the uninephrectomized rat resists amelioration following islet transplantation (1982)
    Springer
    Diabetologia 23 (1982), S. 347-353 
    Details
    ISSN: 1432-0428
    Keywords: Diabetes ; uninephrectomy ; islet transplantation ; glomerulus ; mesangium ; basement membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Uninephrectomy is known to accelerate the development of both functional and morphological changes seen with experimental diabetic nephropathy in the rat. The present experiments utilized electron and light microscopic morphometric techniques to assess glomerular basement membrane width and the volumes of the total mesangium and its cellular and matrix components of inbred Lewis rats made diabetic at 6 weeks of age and uninephrectomized 9 days later. Immunofluorescent microscopy was used to evaluate IgG and C3 in the mesangium. The reversibility of established diabetic glomerular lesions in uninephrectomized diabetic rats after 7 months of diabetes was studied by performing intraportal transplant of neonatal pancreatic tissue. Renal biopsies were taken 2 months later in transplanted and non-transplanted animals. Islet transplantation lowered plasma glucose to normal levels (29.6 to 7.3 mmol/l) and raised plasma insulin values (6.3 to 53 μU/l). Glomerular basement membrane width in transplanted rats (268 nm) still exceeded the same measure (226 nm) in nondiabetic uninephrectomized rats. In transplanted animals volumes of the mesangium (0.51 × 106 μm3) and of its cellular (0.27 × 106 μm3) and matrix (0.24 × 106 μm3) components remained higher than similar measures in control rats (0.32 × 106, 0.17 × 106 and 0.15 × 106 μm3, respectively). Mesangial IgG in treated animals approached normal, but mesangial C3 remained similar to levels in non-transplanted diabetic control animals. These observations in uninephrectomized-diabetic rats contrast with previous observations in intact diabetic rats in which mesangial volumes and localization of immunoglobulins and complement returned to normal levels following islet transplantation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00253743
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Estimating potato leaf area index for specific cultivars (1997)
    Springer
    Potato research 40 (1997), S. 251-266 
    Details
    ISSN: 1871-4528
    Keywords: LAI ; canopy expansion ; radiation use efficiency ; Solanum tuberosum L. ; soil water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The growth and duration of crop leaf area determines the amount of solar radiation intercepted by the canopy and therefore influences the extent of photosynthesis, evaporation, transpiration and final dry matter yield. The objective of this study was to develop cultivar specific relationships to estimate the daily leaf area index (LAI) for the potato crop (Solanum tuberosum L.) that included the effects of available soil water. The model is divided into three LAI growth stages, the durations of which are partially related to potato heat units (PHU). The LAI in the first stage is estimated from a cultivar specific leaf area-based radiation use efficiency index with a soil water reduction factor. The second stage involves the maintenance of a constant LAI with the duration related to both PHU and a soil water index that can accelerate senescence. The final stage includes a decrease in the LAI from a maximum to zero in response to a cultivar specific PHU accumulation. Model simulations compared favourably with independent LAI measurements obtained with a LI-COR plant canopy analyzer over two seasons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358007
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Non-destructive estimation of potato leaf area index using a fish-eye radiometer (1994)
    Springer
    Potato research 37 (1994), S. 393-402 
    Details
    ISSN: 1871-4528
    Keywords: measurement ; LAI ; Solanum tuberosum L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Leaf area index (LAI) is widely used in many facets of potato (Solanum tuberosum L.) modelling but direct measurements have historically been difficult. This investigation tested the accuracy of a commercially available instrument (LI-COR LAI-2000) for measuring LAI non-destructively on a potato crop. Accurate estimates of LAI were difficult to obtain with small plots of≈1 m2. Results from larger field plots were extremely favourable and indicate that non-destructive measurements of LAI in situ can routinely be estimated within 5 to 10% of the destructively measured LAI. Six thinning tests performed on four potato cultivars produced average root mean square error measurements of LAI that ranged from 0.09 to 0.27.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358353
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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