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  • Chemistry  (18)
  • LUNAR AND PLANETARY EXPLORATION  (11)
  • Physics  (7)
  • Protein degradation  (3)
  • Nitrogen deficiency  (2)
  • PIC  (2)
Collection
Keywords
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Years
  • 1
    facet.materialart.
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    The vespa process for the analysis of seismic signals (1971)
    In:  Nature, Warszawa, Army Corps of Engineers, Woodward-Clyde Consultants, vol. 232, no. 5, pp. 8-13, pp. 1013, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1971
    Keywords: Seismic networks ; Seismic arrays ; PIC ; ves
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Pattern recognition techniques for the interpretation of vespagrams and beamsplit data (1971)
    MIT Lincoln Lab.
    In:  Semiannual Technical Summary Report, Lexington, Mass., MIT Lincoln Lab., vol. 10, no. rapport C 20754-9.1 (2.2), pp. 38-41
    Details
    Publication Date: 1971
    Keywords: Artificial intelligence (AI) ; Pattern recognition ; Detectors ; PIC ; ves ; Seismic networks ; Seismic arrays ; Discrimination ; Data analysis / ~ processing
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
    Electronic Resource
    Electronic Resource
    The effect of nitrogen deficiency on the growth and metabolism of Lemna minor L. (1977)
    Springer
    Planta 137 (1977), S. 259-264 
    Details
    ISSN: 1432-2048
    Keywords: Glycolysis ; Lemna ; Nitrogen deficiency ; Protein degradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract When Lemna is deprived of nitrogen, growth and respiration decrease and the pattern of 14CO2 release from [1-14C]glucose and [6-14C]glucose is consistent with a relatively strong inhibition of glycolysis. Protein degradation is enhanced but the concentration of free amino acid decreases. It is argued that the biological significance of the increased protein degradation does not lie in its contribution to respiration but as a mechanism to replace one set of enzymes adapted to a particular environmental condition (high nitrogen) with another set of enzymes adapted for low nitrogen in the environment. The change in enzyme pattern associated with the change from high to zero nitrogen in the growth medium has been examined for nine enzymes. The changes in activity observed are consistent with the observed apparent inhibition of glycolysis during nitrogen starvation, but do not explain the inhibition of the pentose phosphate pathway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388160
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  • 4
    Electronic Resource
    Electronic Resource
    The control of aldolase in Lemna minor L. in relation to nitrogen deficiency (1977)
    Springer
    Planta 137 (1977), S. 271-277 
    Details
    ISSN: 1432-2048
    Keywords: Aldolase ; Lemna ; Nitrogen deficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The loss of activity of aldolase which occurs when Lemna is deprived of nitrogen is shown to be due to the accumulation of a specific inhibitor of aldolase. The inhibitor has been purified 600-fold and has the properties of a low molecular weight protein. The inhibitor is not a proteolytic enzyme and the kinetics of the interaction between aldolase and the inhibitor are reported. The possible physiolgocal significance of the inhibition of aldolase is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388162
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  • 5
    Electronic Resource
    Electronic Resource
    The mechanism of deuterium oxide-induced protein degradation in Lemna minor (1980)
    Springer
    Planta 148 (1980), S. 374-380 
    Details
    ISSN: 1432-2048
    Keywords: Deuterium oxide ; Lemna ; Protein degradation ; Stress (D2O) ; Tonoplast properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Transfer of Lemna minor fronds to culture medium containing 50% (v/v) deuterium oxide induces a large increase in the rate of protein breakdown, which is not due to an increase in the activity of acidic or neutral proteolytic enzymes or peptidases. Biochemical and ultrastructural evidence indicates that deuterium oxide affects the properties of certain membranes, particularly the tonoplast, and allows vacuolar proteolytic enzymes to pass into the cytoplasm and cause the increased protein breakdown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388126
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  • 6
    Electronic Resource
    Electronic Resource
    The molecular basis of the selectivity of protein degradation in stressed senescent barley (Hordeum vulgare cv. Proctor) leaves (1983)
    Springer
    Planta 158 (1983), S. 550-559 
    Details
    ISSN: 1432-2048
    Keywords: Enzyme degradation ; Hordeum (protein degradation) ; Protein degradation ; Senescence ; Stress and protein degradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The molecular basis for the selectivity of protein degradation has been examined in osmotically stressed and senescent barley leaves. Relatively weak correlations between the in-vivo rate of loss of enzyme activity, and the charge and molecular weight of the enzymes ahve been detected. We interpret these correlations as supporting the view that the selectivity of enzyme degradation is the result of the physical properties of the enzymes being degraded. The weakness of the correlates is taken to mean that a number of properties which contribute to the selectivity are independent of one another. Under in-vitro conditions (autolysis at 0° C), the loss of enzyme activity was weakly correlated with the charge of the enzymes. However, there was a general similarity between the in-vivo pattern of loss of enzyme activity and the in-vitro patterns under a number of conditions. Furthermore double-isotope experiments demonstrated that the in-vivo degradation of soluble protein was reflected by in-vitro degradation under a number of conditions. Consequently we conclude that the selectivity of protein degradation is largely independent of the nature of the proteolytic system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397246
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  • 7
    Electronic Resource
    Electronic Resource
    1H-NMR determination of the thermodynamics of drug complexation with single-stranded and double-stranded oligonucleotides in solution: Ethidium bromide complexation with the deoxytetranucleotides 5′-d(ApCpGpT), 5′-d(ApGpCpT), and 5′-d(TpGpCpA) (1997)
    New York : Wiley-Blackwell
    Biopolymers 42 (1997), S. 285-295 
    Details
    ISSN: 0006-3525
    Keywords: thermodynamic parameters of drug binding ; 1H-nmr of drug binding ; ethidium bromide binding (ΔG, ΔH, ΔS) ; intercalation of ethidium bromide ; oligodeoxynucleotides ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermodynamical parameters (free energy, enthalpy, and entropy) of complex formation between ethidium bromide and single-stranded and double-stranded tetranucleotides of different base sequence [5′-d(TpGpCpA), 5′-d(ApCpGpT), and 5′-d(ApGpCpT) have been determined from the temperature dependencies of 500 MHz proton nmr chemical shifts. The analysis enables the contributions to be differentiated for the formation of different types of complexes (1:1, 2:1, 1:2, and 2:2) in aqueous solution. The results have been interpreted in terms of the main types of intermolecular interactions responsible for formation of the different complexes; van der Waals and electrostatic interactions are important for formation of complexes of ethidium bromide with single-stranded tetranucleotides, whereas van der Waals and hydrophobic interactions play a significant role in the binding of the dye to the tetramer duplexes. © 1997 John Wiley & Sons, Inc. Biopoly 42: 285-295, 1997
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Nitrogen-phosphorous antagonism in flame-retardant cotton (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 31 (1986), S. 1655-1662 
    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: Phosphorous, as sodium dihydrogen phosphate, and nitrogen, in the form of a urea-for-maldehyde condensate, were applied to cotton fabric. The flame-retarding character of each treated fabric was assessed by determining the respective limiting oxygen index. Analysis of the results showed that at the lowest levels of applied phosphorous (P = 2%), the presence of nitrogen produced less than an additive combined flame-retarding effect. At higher phosphorous levels, this deviation from additivity increased until at P 〉 6%, the presence of nitrogen antagonized the flame-retarding effect of the phosphorous. These observations are discussed within the current ideas of nitrogen-phosphorous interaction in flame-retardant systems, for cotton-containing fabrics.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1986.070310611
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  • 9
    Electronic Resource
    Electronic Resource
    Nitrogen-phosphorous antagonism in flame-retardant cotton (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 32 (1986), S. 5691-5691 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1986.070320639
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  • 10
    Electronic Resource
    Electronic Resource
    The electroinitiated polymerization of N-vinylcarbazole with zinc bromide, IIPart I: cf.12.. Kinetics of polymerization (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 169 (1973), S. 177-189 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die elektroinitiierte Polymerisation von N-Vinylcarbazol (VCZ) wurde in Aceton bei 25°C mit Zinkbromid als Katalysator unter Verwendung von Platinelektroden eingehend untersucht. Die Polymerisationsgeschwindigkeit erwies sich als direkt abhängig von der Stromstärke, der Zinkbromid-Konzentration und dem anfänglichen Wassergehalt des Solvens.Die Molekulargewichte der entstandenen Polymeren (1000-6000) sind unabhängig von der Stromstärke, der Zinkbromid-Konzentration und dem Umsetzungsgrad des Monomeren zum Polymeren, werden jedoch beeinflußt durch Wasser, die Monomerkonzentration und das Elektrodenmaterial. Die chemische Zusammensetzung der Polymeren ändert sich nicht mit der Stromstärke, der Zinkbromid-Konzentration, dem Umsetzungsgrad und dem Elektrodenmaterial. Sie ändert sich jedoch ein wenig mit dem Wassergehalt des Acetons.
    Notes: The electroinitiated polymerization of N-vinylcarbazole (VCZ) in acetone solvent at 25°C with zinc bromide, as catalyst, and platinum electrodes was investigated in detail. The polymerization rate was found to be directly dependent on current strength, zinc bromide concentration and the initial water content of the solvent.The molecular weights of the formed polymers (1000-6000) are independent of current strength, zinc bromide concentration and degree of conversion of monomer to polymer, but are affected by water, monomer concentration, and by the type of electrodes used. The chemical composition of the polymer is invariant with current strength, zinc bromide concentration, degree of conversion, and electrode material but does vary slightly with the water content of acetone.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1973.021690117
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