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  • Roots  (5)
  • 42.55
  • Springer  (7)
  • Annual Reviews
  • 1980-1984
  • 1975-1979  (7)
  • 1979  (7)
Collection
Keywords
Publisher
  • Springer  (7)
  • Annual Reviews
Years
  • 1980-1984
  • 1975-1979  (7)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Effect of soybean plant growth on spore production byGlomus mosseae (1979)
    Springer
    Plant and soil 53 (1979), S. 393-397 
    Details
    ISSN: 1573-5036
    Keywords: Glycine max (L.) Merr. ; Growth stage ; Roots ; Shoots ; Shoot removal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Plants of two soybean cultivars infected withGlomus mosseae were physiologically stressed by top removal and were harvested at seven bi-weekly intervals. Removing tops stopped root growth, stimulated branching, delayed plant growth stages by approximately two weeks, but did not affect spore production. Spore numbers were significantly related only to time of harvest. Pot variation in spore number was not significantly correlated with infection percentage or root dry weight. Harvest, cultivar, and cutting effects were highly significant for root and shoot weights and root/shoot ratios.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277873
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  • 2
    Electronic Resource
    Electronic Resource
    Cw oscillation at 1.05 and 1.32 μm of LiNd(PO3)4 lasers in external resonator and in resonator with directly applied mirrors (1979)
    Springer
    Applied physics 20 (1979), S. 329-334 
    Details
    ISSN: 1432-0630
    Keywords: 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The room temperature cw oscillation at 1.05 and 1.32 μm of lithium neodymium tetraphosphate [LiNd(PO3)4, LNP] lasers in an external resonator and, for the first time, also in a Fabry-Perot resonator with directly applied mirrors is reported. The growth and fluorescence properties of the LNP crystals are briefly described. Laser parameters such as threshold pump power, output power, differential efficiency, optical gain, emission cross section and laser modes are both measured and calculated. Laser experiments show the threshold pump power to be lower for 1.05 μm than for 1.32 μm emission because of the smaller emission cross section; the pump power density is lower for the external resonator than for the Fabry-Perot resonator because of its higher mode losses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00895005
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  • 3
    Electronic Resource
    Electronic Resource
    CW HCN laser gain in a hollow dielectric rectangular cross-section discharge tube (1979)
    Springer
    Applied physics 19 (1979), S. 359-361 
    Details
    ISSN: 1432-0630
    Keywords: 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This paper describes a 1 m-long CW HCN discharge laser with a hollow dielectric rectangular discharge tube of 5×20 cm2 cross-section. For optimum working conditions, the characteristics of the amplifying medium have been made constant over the cross-section, by using an additional magnetic field. Then, the unsaturated gain for the 337 μm line is 6.8% m−1. It is shown to be dependent on the smaller dimension of the cross-section rather than on the other dimension. By using the tube as a waveguide, laser output power of 1 Watt might be obtained with a discharge length of 4 m, instead of the 12m-long discharge required to get the same output power from a cylindrical waveguide laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900481
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  • 4
    Electronic Resource
    Electronic Resource
    Structure and permeability of the epidermal/hypodermal layers of the sand sedge (Carex arenaria, L.) (1979)
    Springer
    Protoplasma 101 (1979), S. 331-347 
    Details
    ISSN: 1615-6102
    Keywords: Carex arenaria ; Epidermis ; Hypodermis ; Permeability ; Roots
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary During the normal course of development in the root of sand sedge (Carex arenaria), many of the cells in the central cortex degenerate to form an extensive aerenchyma. The epidermis and multi-layered hypodermis become heavily suberized and only remain attached to the stele by a few, thin, radial files of cortical cells that have not autolyzed. These changes make it possible for epidermal/hypodermal sleeves to be isolated so that their permeability can be determined. The coefficient of diffusive permeability for tritiated water is of the order of 20 nm s−1, while the permeability coefficient for self diffusion of labelled phosphate and calcium is approximately 5.0 and 4.0 nm s−1 respectively. These values are approximately 200 (water) and 500 (phosphate and calcium) times lower than similar determinations made on isolated sleeves of onion roots. The outer layers of the mature root ofC. arenaria are thus extremely impermeable: any significant absorptive function has been lost at the expense of a protective role provided by the modified cortex for the vascular stele.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276972
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  • 5
    Electronic Resource
    Electronic Resource
    A machine for determining root length (1979)
    Springer
    Plant and soil 52 (1979), S. 69-76 
    Details
    ISSN: 1573-5036
    Keywords: Roots ; Growth ; Measurement ; Root length ; Electronics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A machine for determining the root length of a sample is described. The machine is basically an opto-electronic scanner. Root segments are cut and placed in water on a glass plate (375×375 mm). The interruption of a light beam moving across the root sample is detected by a photo-diode and the total root length computed. Using this machine a root sample can be measured in less than 3 minutes. Detailed calibration was only conducted up to 50 m although samples as large as several hundred metres can be measured using this machine. The machine has a high degree of accuracy comparable with or better than other reported methods for determining root length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02197733
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  • 6
    Electronic Resource
    Electronic Resource
    The estimation of root length in samples and sub-samples (1979)
    Springer
    Plant and soil 52 (1979), S. 77-83 
    Details
    ISSN: 1573-5036
    Keywords: Roots ; Growth ; Measurement ; Root length ; Electronics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Methods for estimating the root length in a sample using the line intersect principle were compared. One method involved visual techniques and used simple equipment. Another method introduced a new machine designed to estimate root length automatically. Either method had a high degree of accuracy, comparable with or better than other reported methods. Furthermore, the methods were tested over a wide range of root lengths up to 50 m. Even larger samples could be estimated using a reliable sub-sampling technique. The development of the root machine enabled the estimation of root length to become a simple laboratory routine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02197734
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  • 7
    Electronic Resource
    Electronic Resource
    Allelopathic effects ofParthenium hysterophorus L. (1979)
    Springer
    Plant and soil 53 (1979), S. 27-35 
    Details
    ISSN: 1573-5036
    Keywords: Allelopathy ; Exudation ; Growth inhibition ; Nodulation ; Parthenium ; Roots
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Association withParthenium hysterophorus L. caused retarded growth and nodulation in bean (Phaseolus vulgaris var. ‘Burpees Stringless’) the inhibition decreasing with increasing distance from the weed. Leachate collected from Parthenium grown pots also caused similar inhibition in bean growth. The inhibitory nature of the root exudate was confirmed under sterile cultural conditions by its effect on wheat (Triticum aestivum var. ‘UP301’) seedling growth. At the rosette and flowering stage of the weed there was maximum exudation of inhibitors which remained active for about thirty days.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181876
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