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  • nitrogen content  (2)
  • Angiography  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Neuroradiological features of intracranial and intraorbital meningeal haemangiopericytomas (1994)
    Springer
    Neuroradiology 36 (1994), S. 440-445 
    Details
    ISSN: 1432-1920
    Keywords: Intracranial haemangiopericytoma ; CT ; MRI ; Angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The neuroradiological features of six intracranial and one intraorbital haemangiopericytomas (HP) are reviewed. CT was performed before and after IV contrast medium in 5 patients. In 2 patients MRI was performed before and after contrast medium; in another, only unenhanced images were obtained. Five patients were studied by selective external and internal carotid artery angiography. Women constituted 5 of the 7 patients, and the mean age was 50.5 years, thus the sex and age distribution did not differ from that of typical meningiomas. Contrary to previous reports, calcification was present in two of the intracranial HP, and bone erosion was clearly seen in one intracranial HP and the orbital lesion. On MRI the tumours showed no differences from angioblastic meningiomas. All 6 intracranial HP were aggressive; all recurred following treatment and extracerebral metastasis occurred in one case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00593679
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Potato micropropagation: Growth of cultivars in solid and liquid media (1996)
    Springer
    Potato research 39 (1996), S. 253-258 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; nitrogen content ; sugar content ; Spunta ; Kennebec ; Huinkul ; nutrient availability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of liquid and solid media on the growth of micropropagated potato shoots (cvs Spunta, Kennebec and Huinkul) was studied in relation to the availability of nutrients and water in the culture medium. Nitrogen and sugar assimilation in the shoot and the water content of the shoots were evaluated. The water content of the plant tissues was not affected by the physical state of the medium. The liquid medium caused a greater accumulation of dry matter in the shoot without changing assimilate partition. The liquid medium increased shoot growth without affecting the number of nodes. The higher growth rate of shoots in liquid medium was correlated with increases in their organic nitrogen and sugar contents, indicating that nutrient assimilation was favoured in liquid media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360916
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of nitrogen source on growth and morphogenesis of three micropropagated potato cultivars (1994)
    Springer
    Potato research 37 (1994), S. 161-168 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; dry matter partition ; nitrogen content ; DW/Nratio ; nitrate ; ammonium ; glutamic acid ; in vitro nitrogen source
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Different nitrogen sources (NO3 −, NH4 +, glutamic acid and their combinations) influenced the growth and morphogenic responses (node number, shoot length, and stem, leaf and root dry weight) of three micropropagated potato cultivars (Spunta, Kennebec, Huinkul). Addition of reduced nitrogen (NH4 + or glutamic acid) in a nitrate medium increased shoot length and leaf number. The large increase in growth in plants fed with NO3 −, NH4 + could be explained by higher organic nitrogen content and enhanced dry matter partition to the shoot. This suggests that reduced nitrogen source is required, at least as a supplement to NO3 −, to enhance N assimilation and growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358717
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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