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  • 1
    Electronic Resource
    Electronic Resource
    In vitro studies of the submerged angiospermRuppia maritima: Auxin and cytokinin effects on plant growth and development (1991)
    Springer
    Marine biology 110 (1991), S. 1-6 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Axenic tissue cultures ofRuppia maritima L. were established and propagated clonally in vitro from terminal rhizome segments collected from Tampa Bay, Florida, USA. Cultures were maintained in a base medium consisting of synthetic seawater supplemented with half-strength Murashige and Skoog salts and 1% sucrose at pH 5.6. The effects of five cytokins [6-furfurylaminopurine (kinetin), 6-benzylaminopurine (BAP), 2-isopentyladenine (2iP), 6-(4-hydroxy-3-methyl-but-2-enylamino) purine (zeatin), andn-phenyl-n′-1,2,3-thidiazol-5′yl urea (thidiazuron)] and one auxin [napthalene acetic acid (NAA)] on explant growth and development were investigated. Cytokinin additions resulted in a 3- to 4-fold increase in nodal production, branching, and biomass ofR. maritima after 12 wk in culture. Cultures responded in a dose-dependent manner to 2iP but exhibited broad dose-response curves to kinetin, BAP, zeatin, and thidiazuron. NAA addition resulted in increased leaf and internodal lengths, but reduced the number of leaves per node and the rhizome biomass. The addition of NAA almost completely suppressed root growth in media without cytokinins and had an antagonistic effect on nodal production and branching in cytokinin-supplemented media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313085
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  • 2
    Electronic Resource
    Electronic Resource
    Hydrodynamics, diffusion-boundary layers and photosynthesis of the seagrasses Thalassia testudinum and Cymodocea nodosa (1994)
    Springer
    Marine biology 118 (1994), S. 767-776 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photosynthetic rates of aquatic plants frequently increase with increasing current velocities. This is presumably due to a reduction in the thickness of the diffusion boundary-layer which allows for a higher carbon availability on the plant surface. Blades of the seagrasses Thalassia testudinum and Cymodocea nodosa exposed to different current velocities under controlled laboratory conditions, showed increased photosynthetic rates with increasing flow only at low current velocities (expressed as blade friction velocities, u *). Carbon saturation of photosynthetic processes occurred at a relatively low u * level (0.25 cm s-1) for T. testudinum collected from a calm environment compared to C. nodosa (0.64 cm s-1) collected from a surf zone. No further enhancement of photosynthetic rates was observed at higher u * levels, suggesting limitations in carbon diffusion through the boundary layer below critical u * levels and possible limitations in carbon fixation by the enzymatic system at higher u * levels. These results, as well as those of previous theoretical studies, assumed the flow on the immediate seagrass-blade surface to be hydrodynamically smooth. The presence of epiphytes and attached debris causes the surface of in situ seagrass blades to be exposed to flows ranging from smooth to rough-turbulent. As a consequence, the boundary-layer thickness on moderately epiphytized blades under medium to high flow-conditions is not continuous, but fluctuates in time and space, enhancing carbon transport. In situ u * levels measured directly on blades of seagrasses indicate that T. testudinum and C. nodosa can be exposed to conditions under which the boundary layer limits photosynthesis during short periods of time (milliseconds) during low-energy events. As waves cause the thickness of the diffusion boundary-layer to fluctuate constantly, carbon-limiting conditions do not persist for prolonged periods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00347527
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  • 3
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1976)
    Springer
    Naturwissenschaften 63 (1976), S. 203-206 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624234
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  • 4
    Electronic Resource
    Electronic Resource
    Erdwärme — Alternative oder Ergänzung zur Kernenergie? (1978)
    Springer
    Naturwissenschaften 65 (1978), S. 649-650 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401907
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  • 5
    Electronic Resource
    Electronic Resource
    Geschwindigkeit und Temperaturabhängigkeit photosensibilisierter Reaktionen mit O2 (1954)
    Springer
    Naturwissenschaften 41 (1954), S. 425-426 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00625675
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  • 6
    Electronic Resource
    Electronic Resource
    Messung der Aktivierungsenergien der Selbstdiffusion auf hochreinen Kristallflächen von kflz. Nickel und krz. Siliciumeisen (2,75% Si) mit Hilfe des Feldelektronenmikroskops (1970)
    Springer
    Monatshefte für Chemie 101 (1970), S. 1606-1613 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract By application of strong electric fields at high temperatures the equilibrium shape of field-electron tips is transformed into the polyhedrical “buildup” shape. After cutting off the electric field the times necessary for the tip to return to equilibrium shape are measured. The temperature dependences of these times are used to calculate the activation energies of self diffusion. Experiments were carried on fcc. Nickel and bcc. Silicon Iron (2.75% Si).
    Notes: Zusammenfassung Mit dem Verfahren der Messung der Abbaugeschwindigkeit der Aufbauform von Feldemissionsspitzen wird eine Meßmethode zur Bestimmung der Aktivierungsenergie der Selbstdiffusion auf Kristalloberflächen beschrieben. Zu diesem Zweck werden auf hoher Temperatur befindliche Feldemissionsspitzen durch Anlegen starker elektrischer Felder zur Ausbildung der polyedrischen sog. Aufbauform gebracht. Nach Abschalten des elektrischen Feldes werden die Zeiten gemessen, welche die Probe benötigt, um von der Aufbauform wieder zur Gleichgewichtsform zu gelangen. Aus der Temperaturabhängigkeit dieser Rückdiffusionszeiten kann die Aktivierungsenergie der Oberflächendiffusion bestimmt werden. Die Versuche wurden an Nickel als Vertreter des kflz. Gitters und an Fe(Si) des krz. Gitters durchgeführt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01152072
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  • 7
    Electronic Resource
    Electronic Resource
    Unoccupied electronic levels and conduction-band structure of Xe(111) probed by inverse photoemission (1987)
    Springer
    Applied physics 44 (1987), S. 97-99 
    Details
    ISSN: 1432-0630
    Keywords: 71.25T ; 73.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Inverse photoemission spectra from Xe(111) crystals grown on an Ag(111) substrate show features which are interpreted in terms of density-of-states emission from the conduction bands of Xe along theГ-L direction. The energies of critical points determined by this method show good agreement with recent spin-polarised photoemission band mapping. A peak which is located in the fundamental band gap is tentatively assigned to surface emission, on the basis of an experiment in which this peak is quenched by covering the Xe crystal with one monolayer of krypton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617898
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  • 8
    Electronic Resource
    Electronic Resource
    Strategies in non-isothermal reaction kinetics (1988)
    Springer
    Journal of thermal analysis and calorimetry 33 (1988), S. 1259-1261 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01912761
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  • 9
    Electronic Resource
    Electronic Resource
    Photochemische Untersuchungen an vicinal-substituierten tertiären Alkylaziden (1973)
    Springer
    Monatshefte für Chemie 104 (1973), S. 220-225 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das photochemische Verhalten einiger Titelverbindungen wird untersucht. Die Ergebnisse werden mit den verschiedenen mechanistischen Anschauungen über die Photolyse von Alkylaziden korreliert. Die Photolyse vont-Butylazid liefert andere Ergebnisse, als in der Literatur beschrieben.
    Notes: Abstract The photochemical behaviour of several of the title class of compounds was studied, and the results correlated with the various views concerning the mechanism of alkyl azide photolysis. The results of photolysis oft-butyl azide differ from those described in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00911163
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  • 10
    Electronic Resource
    Electronic Resource
    Dilution of brackish waters in irrigation networks —An analytic approach (1985)
    Springer
    Irrigation science 6 (1985), S. 191-200 
    Details
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Rational method of improving poor water by the admixture of good-quality water for irrigation purposes is proposed and demonstrated. The principles of the dilution process, carried out in dilution junctions, are explained. Continuity equations for water and for the mass of relevant substances present in the water are derived for a dilution junction. These equations characterize the suitability of the mixture for irrigation. The optimal operation of a dilution network for irrigation with brackish, sewage and fresh water is formulated and analyzed based on graph theory. A system of non-linear constraints which satisfactorily describes requirements for water quality and flow rates in terms of field demands and water sources is presented. Optimal operation is defined as the minimum water delivery cost. In dilution networks having no more than one outflow conduit of unknown concentration per junction, the non-linear optimization problem can be reduced into a linear one, making the use of Linear Programming (LP) possible. Adapting the proposed dilution network concept to irrigation can provide a practical means for controlling the quality of water applied in the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572667
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