Results 181 to 190 of about 12,945 (227)

Lipoprotein-induced phenoloxidase-activity in tarantula hemocyanin

Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics, 2015
Phenoloxidases play vital roles in invertebrate innate immune reactions, wound closure and sclerotization processes in arthropods. In chelicerates, where phenoloxidases are lacking, phenoloxidase-activity can be induced in the oxygen carrier hemocyanin in vitro by proteolytic cleavage, incubation with the artificial inducer SDS, or lipids.
Sven, Schenk, Juliane, Schmidt, Ulrich, Hoeger, Heinz, Decker   +3 more
openaire   +2 more sources

Phenoloxidase activity of phenol-degrading bacteria

2010 International Conference on Bioinformatics and Biomedical Technology, 2010
In order to study phenoloxidase (PO) activity of the phenol-degrading bacteria, the carbon source of isolation culture medium adopts artificial phenol mixture. Stenotrophomonas maltophilia K279a is isolated from coal chemical industry wastewater. The optimum conditions for PO production are phenol 1000mg/L, temperature 30–34°C and PH 7–7.5.
null Hong-jun Han, null Fang Fang, null Wen-cheng Ma, null Chun-yan Xun, null Wei Wang, null Hui-qiang Li   +5 more
openaire   +1 more source

Zur Substratspezifität der Phenoloxidase (EC 1.14.18.1)

Acta Histochemica, 1983
Zusammenfassung An 10 µ m dicken Kryostatschnitten von Milz und Darm weiser Ratten wurden im Vergleich mit Dihydroxyphenylalanin folgende Substanzen in jeweils 2 Konzentrationen als Substrat fur das Enzym Phenoloxidase getestet: Pyrogallol, Resorcin, 2,4-Dinitrophenol, Tyraminhydrochlorid, o-Cresol und Adrenalin.
Hans Schmidt, Johannes Koch
openaire   +1 more source

Identification and isolation of endogenous insect phenoloxidase inhibitors

Biochemical and Biophysical Research Communications, 1992
Inhibitors of phenoloxidase were identified in pupae of the housefly, Musca domestica L. The phenoloxidase inhibitors were purified from final instar pupae of the housefly by a combination of ammonium sulfate fractionation, ion-exchange chromatography, gel filtration and reverse-phase high performance liquid chromatography.
T, Tsukamoto, Y, Ichimaru, N, Kanegae, K, Watanabe, I, Yamaura, Y, Katsura, M, Funatsu   +6 more
openaire   +2 more sources

Phenoloxidases in Portabella Mushrooms

Journal of Food Science, 1997
ABSTRACT Tyrosinase, laccase, and peroxidase activities were detected in crude extracts from commercial Portabella mushrooms. Tyrosinase was present in larger amounts than either laccase or peroxidase. Catechol showed the greatest activity as a substrate for tyrosinase while diaminobenzidine was found to be a good substrate for ...
XIAODONG ZHANG, WILLIAM H. FLURKEY
openaire   +1 more source

Phenoloxidase System of the Blowfly, Calliphora erythrocephala

Science, 1964
In Calliphora larvae, an inactive precursor of the enzyme phenoloxidase is present in the hemolymph. A special activator enzyme is localized in the cuticle. When phenoloxidase precursor is allowed to react with the activator, it yields a soluble enzyme having the characteristics mainly of a diphenoloxidase.
C E, SEKERIS, D, MERGENHAGEN
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A fungal phenoloxidase (tyrosinase) involved in pentachlorophenol degradation

Biotechnology Letters, 2004
Amylomyces rouxii eliminated 85% of initial pentachlorophenol (PCP) at 12.5 mg l(-1) when grown with 0.1 g tyrosine l(-1), but only 55% without tyrosine. Addition of tyrosine in the culture medium increased the monophenolase activity by 1.8-fold. Tyrosinase is thus indicated to be the phenoloxidase involved in PCP degradation by A. rouxii .
A M, Montiel, F J, Fernández, J, Marcial, J, Soriano, J, Barrios-González, A, Tomasini   +5 more
openaire   +2 more sources

[The method of demonstrating phenoloxidase].

Acta histochemica, 1976
It is reported on the evidence of phenoloxidase containing cells (=POZ) under various experimental conditions in as well spleen and small gut of white rats as small gut and skin of rabbit. A modified technic is described which gives a shortened incubation time and a regulary pigmentation of the reactive cells.
H, Schmidt, F A, Kiss
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The cuticular phenoloxidase in Drosophila virilis

Journal of Insect Physiology, 1969
The cuticular phenoloxidase in the white puparia of Drosophila virilis was studied. The enzyme is firmly bound to the structure of the cuticle and could not be solubilized from the cuticle. Acetone-treated cuticular preparation oxidizes effectively hydroquinone, pyrogallol, p-aminophenol, dimethyl-p-phenylenediamine, and N-acetyldopamine.
openaire   +1 more source

Effect of Bisulfite on Lobster Shell Phenoloxidase

Journal of Food Science, 1989
ABSTRACT The role of bisulfite inhibition on the phenoloxidase (PO) catalyzed melanosis reaction in lobster was investigated. Bisulfite appears to inhibit melanosis by two mechanisms: (1) by reacting with intermediate quinones in the melanosis reaction, forming sulfoquinones, and (2) by irreversibly reacting with PO causing complete ...
OBDULIO J. FERRER, W. STEVEN OTWELL, M.R. MARSHALL   +2 more
openaire   +1 more source