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  • 1
    Electronic Resource
    Electronic Resource
    Lignin peroxidase oxidation of manganese(2+) in the presence of veratryl alcohol, malonic or oxalic acid, and oxygen (1990)
    s.l. : American Chemical Society
    Biochemistry 29 (1990), S. 10475-10480 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00498a008
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  • 2
    Electronic Resource
    Electronic Resource
    Indirect aluminum toxicity to the green alga Scenedesmus through increased cupric ion activity (1987)
    s.l. : American Chemical Society
    Environmental science & technology 21 (1987), S. 435-438 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00159a002
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  • 3
    Electronic Resource
    Electronic Resource
    Strategies for low detection limit measurements with cyclic voltammetry (1991)
    s.l. : American Chemical Society
    Analytical chemistry 63 (1991), S. 2965-2970 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00024a030
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  • 4
    Electronic Resource
    Electronic Resource
    Etched carbon-fiber electrodes as amperometric detectors of catecholamine secretion from isolated biological cells (1991)
    s.l. : American Chemical Society
    Analytical chemistry 63 (1991), S. 1589-1594 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00015a017
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of diffusional broadening of vesicular packets of catecholamines released from biological cells during exocytosis (1992)
    s.l. : American Chemical Society
    Analytical chemistry 64 (1992), S. 3077-3083 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00048a003
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  • 6
    Electronic Resource
    Electronic Resource
    Fungal degradation of kraft lignin and lignin sulfonates prepared form synthetic 14C-lignins (1977)
    Springer
    Archives of microbiology 112 (1977), S. 291-296 
    Details
    ISSN: 1432-072X
    Keywords: Lignin biodegradation ; Kraft lignin biodegradation ; Lignin sulfonate biodegradation ; DHP ; White-rot fungi ; Wood decay ; Phanerochaete chrysosporium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Kraft lignins (KL), bleached kraft lignins (BKL), and lignin sulfonates (LS) were prepared from synthetic 14C-lignins labeled in the aromatic nuclei or in the propyl side chains. These and control lignins (CL) were incubated with the lignin-decomposing white-rot fungus, Phanerochaete chrysosporium Burds., in a defined culture medium containing cellulose as growth substrate. Decomposition was monitored by measuring the 14CO2 evolved. Average percentages of the [ring-14C]- and [side chain-14C]-lignins, respectively, recovered as 14CO2 at the cessation of 14CO2 evolution were: KL, 41 and 31; BKL, 42 and 26; LS, 28 and 21; and CL, 26 and 24. Gel permeation chromatography of radiolabeled materials extracted from spent cultures showed that substantial degradation to nonvolatile products had occurred. The polymeric components in the extracts were further degraded in fresh cultures. These results indicate that industrial lignins are significantly bioalterable, and that under favorable conditions industrial lignins are substantially biodegradable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00413095
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  • 7
    Electronic Resource
    Electronic Resource
    Ligninolytic system of Phanerochaete chrysosporium: Inhibition by o-Phthalate (1979)
    Springer
    Archives of microbiology 123 (1979), S. 307-309 
    Details
    ISSN: 1432-072X
    Keywords: 2,2-Dimethylsuccinate ; o-Phthalate ; Buffer ; Inhibition ; Lignin biodegradation ; Phanerochaete chrysosporium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The degradation rate of [synthetic-14C]-lignin to 14CO2 by Phanerochaete chrysosporium in cultures buffered with 0.01 M 2,2-dimethylsuccinate (DMS) was twice that in 0.01 M o-phthalate-buffered cultures. This difference could be totally accounted for by o-phthalate inhibition of the activity of the ligninolytic system. 14CO2 production from ring-, sidechain-, and methoxyl-labeled lignins was inhibited, the degree of inhibition being dependent on o-phthalate concentration. Oxidations of 14C-glucose, 14C-acetovanillone, and 14C-apocynol were not inhibited; thus o-phthalate is not a general inhibitor, and might inhibit activities involved in attack of the lignin polymer. DMS is a suitable buffer for the ligninolytic system. Degradation rates of ring-labeled lignin to 14CO2 of 10–15% in 24 h were obtained consistently over the pH range 3.6–4.5, with an optimum near pH 4.0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406666
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  • 8
    Electronic Resource
    Electronic Resource
    Biosynthesis of the secondary metabolite veratryl alcohol in relation to lignin degradation in Phanerochaete chrysosporium (1981)
    Springer
    Archives of microbiology 129 (1981), S. 321-324 
    Details
    ISSN: 1432-072X
    Keywords: White-rot fungi ; Secondary metabolism ; Wood decay ; Mycelial pellets ; Fungus physiology ; l-Glutamic acid repression ; Phenylalanine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The lignin-degrading basidiomycete Phanerochaete chrysosporium synthesizes veratryl alcohol (3,4-dimethoxybenzyl alcohol) via phenylalanine, 3,4-dimethoxycinnamyl alcohol and veratrylglycerol. Study of the conversion of 3,4-dimethoxycinnamyl alcohol to veratrylglycerol and veratryl alcohol showed is to be (a) catalyzed by a secondary metabolic system, (b) markedly suppressed by culture agitation, and (c) strongly inhibited by l-glutamate. The amount of veratryl alcohol synthesized de novo was positively correlated with the O2 concentration after primary growth. Other work has shown that the cinnamyl alcohol terminal residue in a lignin substructure model compound is degraded via arylglycerol and benzyl alcohol structures in ligninolytic cultures of P. chrysosporium, and that the ligninolytic system exhibits traits (a)-(c) above. Ligninolytic activity is also strongly and positively correlated with O2 concentration. The results here suggest, therefore, that the actual biosynthetic secondary metabolic product is 3,4-dimethoxycinnamyl alcohol, but that this is degraded by the ligninolytic system to veratryl alcohol via veratrylglycerol. Veratryl alcohol is only slowly metabolized by the fungus, and accumulates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414706
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  • 9
    Electronic Resource
    Electronic Resource
    Relationship of nitrogen to the onset and suppression of ligninolytic activity and secondary metabolism in Phanerochaete chrysosporium (1981)
    Springer
    Archives of microbiology 130 (1981), S. 59-65 
    Details
    ISSN: 1432-072X
    Keywords: Lignin biodegradation ; White-rot ; Wood decay ; Fungus physiology ; Veratryl alcohol ; Acetovanillone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ligninolytic activity in the white-rot fungus Phanerochaete chrysosporium was previously found not to be induced by lignin, but to develop in cultures in response to nitrogen starvation. Added NH 4 + suppressed existing activity. The present study examined amino acid profiles and protein concentrations during onset of ligninolytic activity (synthetic 14C-lignin→14CO2) in nitrogen-limited cultures, and defined some characteristics of subsequent suppression by added nutrient nitrogen. During the transition between depletion of medium nitrogen and the onset of ligninolytic activity, total free intracellular amino acids increased, then rapidly decreased; changes in glutamate concentration played a major role. Intracellular protein concentration fluctuated in a manner roughly converse to that of the concentration of free amino acids. Protein turnover was rapid (5–7%/h) during the transition period. Glutamate, glutamine, and histidine were the most effective of 14 nitrogenous compounds in suppressing ligninolytic activity after its onset. The suppressive effect was not mediated through carbon (glucose)-catabolite repression or by alterations in culture pH. Activities responsible for oxidation of lignin and the ligninrelated phenol, 4-hydroxy-3-methoxyacetophenone, responded similarly to added nitrogen. Synthesis of a secondary metabolite, veratryl alcohol, like lignin oxidation, was suppressed quite sharply by glutamate and significantly by NH 4 + . Results indicate that nitrogen metabolism affects ligninolytic activity as a part of secondary metabolism, and suggest a role for glutamate metabolism in regulating this phase of culture development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00527073
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  • 10
    Electronic Resource
    Electronic Resource
    Ligninolytic activity of Phanerochaete chrysosporium: Physiology of suppression by NH 4 + and l-glutamate (1981)
    Springer
    Archives of microbiology 130 (1981), S. 66-71 
    Details
    ISSN: 1432-072X
    Keywords: Wood decay ; White-rot fungi ; Lignin biodegradation ; Fungus physiology ; Repression by glutamate ; Glutamate dehydrogenase ; Glutamine synthetase ; Intracellular amino acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Previous research showed that addition of nutrient nitrogen to ligninolytic (stationary, nitrogen-starved) cultures of the wood-decomposing basidiomycete Phanerochaete chrysosporium causes a suppression of lignin degradation. The present study examined early effects on nitrogen metabolism that followed addition of NH 4 + and l-glutamate at concentrations that yield similar patterns of suppression. Both nitrogenous compounds were rapidly assimilated (〉80% in 6 h). Both caused an initial 80% or greater increase in the intracellular glutamate pool and had similar effects in increasing the specific activities of NADP- and NAD-glutamate dehydrogenases and glutamine synthetase. Differences between the effects of added NH 4 + and glutamate showed that suppression was not correlated with intracellular pools of arginine or glutamine, nor was the maintenance of an elevated glutamate pool required to maintain the suppressed state. While a portion of the initial glutamate suppression could be attributed to an effect on central carbon metabolism through glutamate catabolism by NAD-glutamate dehydrogenase, the long term suppression by glutamate and the suppression by NH 4 + were more specific. Suppression by NH 4 + or glutamate in the presence or absence of protein synthesis (cycloheximide) followed essentially identical kinetics during 12 h. These results indicate that nitrogen additions cause a biochemical repression of enzymes associated with lignin degradation. Results are consistent with the hypothesis that nitrogen metabolism via glutamate plays a role in initiation of repression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00527074
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