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  • 11
    Electronic Resource
    Electronic Resource
    Use of Surface Active Agents for Estimating the Charges in Gelatin at the Isoelectric Point (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 1235-1236 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE titration of gelatin with acids and alkalis A gives information on the net combining power of the basic and acidic groups on the protein molecules. This method has been used1'2 to estimate the position of the isoelectric point, at which the number of positively and negatively charged groups are ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1941235a0
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    The effect of pretreatment temperature on the exudation of xylem sap by detached barley root systems (1974)
    Springer
    Planta 121 (1974), S. 81-92 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Roots of barley (Hordeum vulgare L.) plants which had been grown at 20° were cooled to temperatures of 12° C or lower for 1–5 days and then returned to 20° C when measurements were made of ion and water movement into the xylem after excision. Very marked increases in exudation were observed in cooled roots, sometimes as much as four times greater than in controls kept at 20° C throughout their life. There were no consistent increases in the concentration of K+, Ca2+ or H2PO4′ in the exudate from cooled roots and it was concluded that the extra water flow across the root occurred without any increase in the osmotic potential of the sap. Similar changes in ion absorption and translocation were found in intact plants transpiring either rapidly or slowly. Cooled roots contained appreciably more soluble carbohydrate than controls and when they were returned to 20° C their respiration was 50–120% greater. These changes were not, however, strictly correlated with differences in exudation in cooled and untreated roots. Cooled plants which had been heavily shaded respired at the same rate as controls but exuded sap at twice the rate. It is concluded that the effects of cooling on both exudation and the accumulation of roluble carbohydrate are consequences of reduced growth and the possible alteration of the selative amounts of growth substances in the root.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384009
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  • 13
    Electronic Resource
    Electronic Resource
    Rectification of radial water flow in the hypodermis of nodal roots ofZea mays (1988)
    Springer
    Plant and soil 111 (1988), S. 223-229 
    Details
    ISSN: 1573-5036
    Keywords: conductivity ; hydraulic ; hypodermis ; polarity ; roots ; water ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02139943
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    Paper (German National Licenses)
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