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  • Articles: DFG German National Licenses  (38)
  • 1975-1979  (38)
  • Polymer and Materials Science  (26)
  • Chemical Engineering  (6)
  • Avena  (3)
  • Cell & Developmental Biology  (3)
  • Life and Medical Sciences  (3)
  • Cell elongation  (2)
  • General Chemistry
Source
  • Articles: DFG German National Licenses  (38)
Material
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Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    The contribution of tonoplast and plasma membrane to the electrical properties of a higher-plant cell (1978)
    Springer
    Planta 143 (1978), S. 261-265 
    Details
    ISSN: 1432-2048
    Keywords: Avena ; Cells (electric propeties) ; Electrical parameters ; Fusicoccin ; Plasmalemma ; Tonoplast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The cytoplasm of subepidermal parenchyma cells of Avena sativa L. coleoptiles was collected at one end of the cell by centrifugation. The electrical properties of both plasmalemma and tonoplast were then examined with microelectrodes inserted into both cytoplasm and vacuole of the same cell. The input resistance of the cytoplasm measured with either electrode was 7.5±0.8 MΩ while that of the vacuole measured with the single vacuolar electrode and a bridge circuit was 29.2±3.1 MΩ. The latter value was not significantly different from that of control, uncentrifuged cells. The resistance of the tonoplast is therefore several times larger than the input resistance of the cytoplasm, but the specific resistance of the plasma membrane cannot be calculated without knowledge of the extent and pattern of intercellular coupling. Electrical coupling of the cytoplasms of adjacent cells was observed in only two out of eight experiments. The mean potential of the vacuoles,-77.8±6.4 mV, was not significantly different from that of the cytoplasm; however, all the available evidence indicates that variable tip potentials in impaled cells made absolute determination of the membrane potential uncertain. In fusicoccin, the cells hyperpolarized by 20 mV within 10 min. This reponse occurred entirely at the plasmalemma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391996
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Protein synthesis and auxin-induced growth: Inhibitor studies (1979)
    Springer
    Planta 145 (1979), S. 437-442 
    Details
    ISSN: 1432-2048
    Keywords: Auxin ; Avena ; Cell elongation ; Protein synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have compared the effects of cycloheximide (CHI) and two other rapid and effective inhibitors of protein synthesis, pactamycin and 2-(4-methyl-2,6-dinitroanilino)-N-methyl proprionamide (MDMP), on protein synthesis, respiration, auxin-induced growth and H+-excreation of Avena sativa L. coleoptiles. All three compounds inhibit protein synthesis without affecting respiration. The effectiveness of the inhibitors against H+-excretion and growth correlates with their ability to inhibit protein synthesis. Both CHI and MDMP inhibit auxin-induced H+-excretion after a latent period of 5–8 min, and inhibit growth after a 8–10-min lag. These results support the idea that continued protein synthesis is required in the initial stages of the growth-promoting action of auxin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380097
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of fusicoccin on the activity of a key pH-stat enzyme, PEP-carboxylase (1978)
    Springer
    Planta 139 (1978), S. 43-45 
    Details
    ISSN: 1432-2048
    Keywords: Avena ; Cell elongation ; Fusicoccin ; Malate synthesis ; PEP carboxylase ; pH stat ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The phytotoxin fusicoccin (FC) causes rapid synthesis of malate in coleoptile tissues, presumably via phosphoenolpyruvate (PEP) carboxylase coupled with malate dehydrogenase. The possibility that FC directly affects PEP carboxylase in Avena sativa L. and Zea mays L. coleoptiles was studied and rejected. The activity of this enzyme is unaffected by FC whether FC is added in vitro or a pretreatment to the live material. FC does not change the sensitivity of the enzyme to bicarbonate or malate. The activity of FC, instead, appears to be indirect. The pH sensitivity of PEP carboxylase is such that its activity, and thus the rate of malate synthesis, may be enhanced by an increase in cytoplasmic pH accompanying FC-induced H+ excretion. Since the enzyme is also particularily sensitive to bicarbonate levels, malate synthesis may also be enhanced by FC-induced uptake or generation of CO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390808
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal perturbation techniques in characterizing ligand-macromolecule interactions: Theory and application to the proflavin-α-chymotryspin system (1978)
    New York : Wiley-Blackwell
    Biopolymers 17 (1978), S. 1773-1792 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A thermal perturbation curve (TPC) is defined to be the derivative of the fractional degree of saturation, f, with respect to temperature, considered as a function of the natural logarithm of free ligand concentration, y. The theoretical framework for the use of such curves in the thermodynamic analysis of ligand binding to macromolecules is presented. The thermal perturbation curve either provides or complements the information obtained from the derivative binding isotherm ∂f/∂y. For a single set of identical and independent sites the TPC is identical to the derivative binding isotherm. Analysis of such a curve directly yield ΔH0 and ΔG0 for the binding reaction. In actual experimental work, however, the TPC can only be approximated because of “self-buffering” effects relations between the parameter of the approximate curve and the thermodynamic quantities have been developed. This technique is applied to the proflavin-α-chymotryspin system to demonstrate its usefulness. The general features of thermal perturbation curves for cases of multiple sets of independent sites and cooperatively interacting sites have also been developed. The analysis of thermal perturbation curves in combination with other methods should provide a more powerful approach to the characterization of ligand-macromolecule interactions.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1978.360170712
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Thermodynamics of mucopolysaccharide-dye binding. I. Identification of free and bound dye via membrane filtration: Acridine orange-dermatan sulfate system (1977)
    New York : Wiley-Blackwell
    Biopolymers 16 (1977), S. 685-693 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Stoichiometric mixtures of acridine orange with dermatan sulfate at total dye concentrations ≤ 1 × 10-5 M show fluorescence maxima at 540 nm and 660 nm on excitation at 436 nm. By means of membrane filtration, it is directly demonstrated that the species emitting at 540 nm is due only to unbound dye whereas the 660-nm emitting species is due to bound dye. It is, therefore, possible to differentiate unbound acridine orange from its dermatan sulfate complex solely by spectroscopic methods. Thermodynamic binding parameters can be calculated from rapid spectroscopic measurements without disturbing the system.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1977.360160316
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  • 6
    Electronic Resource
    Electronic Resource
    La fusion et la cristallisation de la poly(α,α-diéthyl-β-propiolactone): Comparaison avec d'autres polylactones (1979)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 180 (1979), S. 769-783 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Measurements of crystallization kinetics were made for a sample of poly(α,α-diethyl-β-propiolactone) (DEPL) (syst. name: poly(oxy-2,2-diethyl-1-oxotrimethylene)). An Avrami exponent of 2 was found indicating a two-dimensional growth rate of the crystal, following a pre-determined and heterogeneous nucleation mode. Two melting peaks were found for most samples. The second melting peak (at high temperatures) is probably due to the re-crystallization of part of the sample initially present under the first melting peak. A value of 21kJ.mol-1 was also determined for the heat of fusion of DEPL by the diluent method. This value leads to a degree of crystallinity of 17% which is about four times smaller than that found for poly(pivalolactone) (syst. name: poly(oxy-2,2-dimethyl-1-oxotrimethylene)). We have also determined an equilibrium melting temperature of 531 K for this polymer and an entropy of fusion of 40J.mol-1. K-1. Finally, the surface free energies σ and σe for the lamellar crystals were found to be 12.10-7J.cm-2 and 72.10-7J.cm-2, respectively.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1979.021800320
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Poly(perfluoroether) oxadiazole elastomer system cured with terephthalonitrile oxide (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 1035-1047 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The terpolymerization of N,N′-terephthalonitrile oxide (TPNO), 1,3,5-tricyanobenzene, and oligomeric perfluoroalkylene dinitriles derived from the oligomerization of tetrafluoroethylene oxide yields poly(perfluoroether)-1,2,4-oxadiazole polymers which are soluble in Freon TF and bear pendent nitrile groups as curing sites. The polymerization is a two-step, ambient-temperature reaction. Several different perfluoroether dinitriles are shown to polymerize using this procedure. The syntheses and certain structure/property relationships of the polymers are discussed. Increasing the chain length of the perfluoroalkylene oxide dinitriles results in polymers which range from paraffin-like solids through tough elastomers and, finally, to tacky gums. Tough, crepe elastomer gum with a Tg of -64°C may be obtained in yields of 60-70%. The poly(perfluoroether) oxadiazoles may be milled with additional TPNO and press cured at 95°C (200°F). The following physical properties of the cured polymers are given: compression set, tensile strength, per cent elongation at break, set at break, and Shore A hardness. Thermal stability, moisture stability, and low-temperature flexibility data are also presented for the cured elastomeric polymer.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1976.070200415
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Handbook of plastics and elastomers, Charles A. Harper, Editor-in-Chief, 1024 pages, 525 Illustrations, McGraw-Hill Book Company, $39.50 (1976)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 413-413 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690220236
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  • 9
    Electronic Resource
    Electronic Resource
    Flows of nonlinear fluids through porous media (1976)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 736-744 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The conventional “cylindrical tube” model of porous media is shown to be inapplicable to flows of nonlinear fluids. A more precise geometric description of the converging-diverging pore geometry appears to enable accurate pressure drop-flow rate descriptions but requires further development.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690220416
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  • 10
    Electronic Resource
    Electronic Resource
    Drop coalescence in liquid-liquid fluidized beds (1978)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 24 (1978), S. 985-992 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A drop size segregation technique leads to a direct measurement of the interdrop coalescence frequencies of equisized droplet swarms in liquid-liquid fluidized beds. Mass transfer between the phases and the use of a tracer dye are avoided. The study includes the effects of highly viscous continuous as well as dispersed phases. Binary liquid solutions of ethylene glycol and distilled water provided aqueous phases of increasing viscosity, and toluene was the second liquid phase. Twenty two liquid-liquid systems including other dispersed liquids, namely, benzene, ethyl acetate, cyclohexane, and carbon tetrachloride, were studied by this technique.In the case of toluene continuous, the drops of water dispersed in toluene were large in size, and they coalesced at unusually high rates up to about 100 times faster than those of toluene dispersed in water. Similarly, anhydrous ethylene glycol dispersed in toluene showed somewhat high coalescence frequencies. All the data excluding these two anomalous systems were analyzed by a stepwise regression technique to yield the best fitting correlation in terms of the most significant dimensionless ratios.For the present, the proposed empirical correlation for the dimensionless parameter [ω D × 105/Vs] containing the coalescence frequency (ω, time-1) as a function of the coalescence number (σ/μcVs) and the viscosity ratio (μd/μc) is as follows: \documentclass{article}\pagestyle{empty}\begin{document}$$({{\omega D \times 10^5 } \mathord{\left/ {\vphantom {{\omega D \times 10^5 } {V_s }}} \right. \kern-\nulldelimiterspace} {V_s }}) = 0.020({\sigma \mathord{\left/ {\vphantom {\sigma {\mu c}}} \right. \kern-\nulldelimiterspace} {\mu c}}V_s)^{1.18} ({{\mu d} \mathord{\left/ {\vphantom {{\mu d} {\mu c}}} \right. \kern-\nulldelimiterspace} {\mu c}})^{0.450} $$\end{document}.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690240607
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    Paper (German National Licenses)
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