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  • 1
    Electronic Resource
    Electronic Resource
    Total synthesis of (.+-.)-sarracenin (1978)
    s.l. : American Chemical Society
    The @journal of organic chemistry 43 (1978), S. 784-786 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00398a077
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  • 2
    Electronic Resource
    Electronic Resource
    Light-initiated electron transfer in functional surfactant assemblies. 1. Micelles with transition metal counterions (1979)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 101 (1979), S. 567-572 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00497a013
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  • 3
    Electronic Resource
    Electronic Resource
    Lake circulation induced by density currents: an experimental approach (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 24 (1977), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: This short note reports a series of density current experiments designed to model turbidity underflows caused by flood-stage discharge of lake-tributaries. In a 5.8 m long tank filled with freshwater, saltwater was fed in continuously, flowing down a 15°‘delta’ slope onto a horizontal floor. These density currents maintained steady state characteristics. The main objectives of this investigation were to determine (1) the flow regime of the density currents and (2) the underflow-induced movements in the freshwater. Reynolds numbers for thirty-five runs ranged from 70 to 4100. Experiments with laminar flow reproduced kinematic (Froudian) models of underflows measured in the Walensee (Switzerland). Flow was rapid on the slope (Froude number, Fr 〉 1) and tranquil (Fr〈1) on the floor. Turbulent flow experiments yielded velocity profiles (with a maximum at the flow interface) which approximate natural conditions. Movements in formerly stagnant water body are induced by interfacial shear stress: a layer of freshwater is dragged along by the density current and replaced by the backward flow of an equal amount of overlying water (mass conservation). Extrapolated to a natural setting, circulation induced by underflows is probably an important mechanism for oxygenating deep lacustrine basins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1977.tb00268.x
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  • 4
    Electronic Resource
    Electronic Resource
    Measurements of density underflows from Walensee, Switzerland (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 23 (1976), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Speed and direction of bottom currents induced by density underflow of two sediment-laden rivers were measured by oceanographic current meters in the Walensee (= Lake of Walenstadt), Switzerland. The apparently shooting flow of currents (up to 30 cm/s in this study) is suggested as an explanation for laminations in turbidite sequences. The current speed apparently stabilizes on slopes around 2°; this angle seems to correspond to the critical slope where the flow of the measured currents becomes steady. Current direction is controlled by bottom topography and direction of river inflow. Reversal of current direction observed at two sites is probably due to the underflow-induced backward motion of the overlying lake water. Underflow activity in Walensee is correlative with density peaks of the river water input. The currents are compared to Lake Mead (Southwestern U.S.) underflows and sporadic currents in some submarine canyons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1976.tb00040.x
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  • 5
    Electronic Resource
    Electronic Resource
    Daily Patterns under the Life Cycle of a Maize Crop (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 44 (1978), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Together with photosynthesis, transpiration and respiration, the daily uptake of NO3−, NH4+, H2PO4−, K+, Ca2+, Mg2+, SO42−, the root respiration, root volume increase and root excretions have been studied by daily measurements during the growth period of whole maize plants (Zea mays L. cv. INRA F7 × F2) raised until complete maturity on nutrient solution. The uptake patterns show a maximum absorption of NO3−, K+ and Ca2+ during the vegetative growth phase. The absorption of these ions declines during maturation while that of H2PO4− reaches a maximum. Root respiration and particularly the uptake of NO3− and K+ are well correlated with the rate of root growth. Root excretion is more notable in young plants than in the old. It represents less than 0.2% of the net assimilation of adult plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1978.tb08618.x
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  • 6
    Electronic Resource
    Electronic Resource
    Daily Patterns under the Life Cycle of a Maize Crop (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 43 (1978), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Certain activities were studied daily in a self-regulating growth chamber in four maize plants (Zea mays L. cv. INRA F7 x F2), which had been raised under completely artificial conditions. The transpiration pattern parallels that for photosynthesis, where a marked change occurs at flowering followed by a decline during cob formation. Respiration reaches a maximum at flowering and thereafter remains relatively stable. Final production figures are comparable with those obtained in field plants, but under artificial conditions the water requirement is halved. The results from this study increase our understanding of whole plant physiology and enable us to establish a closer correlation between plants raised in the laboratory and those in the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1978.tb01602.x
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  • 7
    Electronic Resource
    Electronic Resource
    Dicyanmethylen-acenaphthenon-hydrazone — Polymethine mit dem Amino-dicyanallylidenimin-Chromophor (1975)
    Springer
    Monatshefte für Chemie 106 (1975), S. 715-721 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Acenaphthenequinone reacts with malononitrile and asymm. substituted hydrazines to deeply coloured 2-dicyanomethylene-1-acenaphthenone-hydrazones. They are classified as aza-cyanine type polymethine dyes with the amino-dicyanoallylidenimide chromophore.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00902176
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  • 8
    Electronic Resource
    Electronic Resource
    Oxygen and carbon dioxide exchanges in crassulacean-acid-metabolism-plants (1979)
    Springer
    Planta 147 (1979), S. 141-144 
    Details
    ISSN: 1432-2048
    Keywords: CAM plants ; CO2 exchange ; Malate oxidation ; O2 exchange ; O2 uptake ; Prenia ; Sempervivum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The 24 h O2 uptake and release together with the CO2 balance have been measured in two CAM plants, one a non-succulent Sempervivum grandifolium, the other a succulent Prenia sladeniana. The O2 uptake was estimated by the use of 18O2. It was found that the mean hourly O2 uptake in the light was 7 times that in the dark for Sempervivum and 5 times that for Prenia, after correction for the lightdark temperature difference. It was estimated that oxygen uptake in the light was 2.4 times greater than oxygen release (=net photosynthesis) in Sempervivum and 1.4 times greater in Prenia. In both plants there was a positive carbon balance over the 24 h period under the experimental conditions. It was estimated that malate formed during the night could, if completely oxidized to CO2 and water, account for 74% of the light phase O2 uptake in Sempervivum. In Prenia the O2 uptake was more than sufficient to account for a full oxidation of malate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389514
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesen mit Nitrilen, XLI. Polymethine aus Cyanaceton-hydrazonen und Tetracyanäthylen (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1787-1796 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses with Nitriles, XLI. Polymethines from Cyanoacetone Hydrazones and TetracyanoethyleneThe reaction of tetracyanoethylene (TCNE) with the activated methylene group of cyanoacetone phenylhydrazones has been investigated in aprotic solvents. With 3-(phenylhydrazono)butyronitrile (1a) a charge transfer complex 4a has been isolated from benzene solutions. This complex is unstable at room temperature, towards irradiation (u. v. and visible) and in polar solvents. Elimination of malononitrile yields 3-phenylhydrazono-1-butene-1,1,2-tricarbonitriles 6, deep-red to blue compounds which are classified as aza-cyanine type polymethine dyes. Elimination of HCN from 4a leads to 1-phenyl-1H-pyrazolo [3,4-b] pyridine-4,5-dicarbonitriles 5. Kinetic measurements and corresponding model calculations have been carried out, but differentiation between possible sequences of reactions has not been achieved within the experimentally practicable range of concentration.
    Notes: Tetracyanäthylen (TCNE) reagiert in aprotischen Lösungsmitteln mit der reaktiven Methylengruppe von Cyanaceton-phenylhydrazonen. In Benzol kann dabei mit 3-(Phenylhydrazono)-butyronitril (1a) ein Charge-Transfer-Komplex 4a isoliert werden. Dieser ist gegenüber polaren Lösungsmitteln bzw. Temperaturerhöhung und Licht instabil. Durch Abspaltung von Malononitril entstehen als Folgeprodukte die tiefroten bis blauen Aza-cyanine 3-Arylhydrazono-1-buten-1,1,2-tricarbonitrile 6 bzw. durch Eliminierung von HCN 1-Phenyl-1 H-pyrazolo [3,4-b]-pyridin-4,5-dicarbonitrile 5. Kinetische Messungen des Zerfalls des Charge-Transfer- Komplexes und Modellrechnungen zur Beschreibung der Reaktionssequenz der Synthese von 5 erbrachten innerhalb des experimentell möglichen Konzentrationsbereichs keine Unterscheidung zwischen den ausgewählten Modellen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090522
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  • 10
    Electronic Resource
    Electronic Resource
    Radikalionenbildung in Lösungen von TCNQ und Polyvinylalkoholacetalen von Naphthalinaldehyd (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 1369-1372 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790527
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