Notizen: Effect of Magnetic Field on Ascorbic Acid Oxidase Activity, I

1986 ◽  
Vol 41 (3) ◽  
pp. 355-358 ◽  
Author(s):  
V. S. Ghole ◽  
P. S. Damle ◽  
W. H.-P. Thiemann
Keyword(s):  
Magnetic Field ◽  
Ascorbic Acid ◽  
Homogeneous Magnetic Field ◽  
Acid Oxidase ◽  
High Substrate Concentration ◽  
Ascorbic Acid Oxidase ◽  
Rate Of Reaction ◽  
Substrate Concentrations ◽  
Burk Plot

A homogeneous magnetic field of 1.1 T strength exhibits a significant influence on the activity of the enzyme ascorbic acid oxidase in vitro. A Lineweaver-Burk plot of the reaction shows the typical pattern of a mixed-type inhibition, i.e. a larger rate of reaction at low substrate concentrations and a smaller rate of reaction at high substrate concentration than that of the control without magnetic field applied.

scholarly journals Ascorbic Acid Oxidase Activity in Apple Buds: Relation to Thidiazuron-induced Lateral Budbreak

HortScience ◽  
1992 ◽  
Vol 27 (10) ◽  
pp. 1102-1105 ◽  
Author(s):  
Shiow Y. Wang ◽  
Miklos Faust
Keyword(s):  
Ascorbic Acid ◽  
Growth Phase ◽  
Chelating Agents ◽  
Acid Oxidase ◽  
Ascorbic Acid Oxidase ◽  
Level Of Activity ◽  
Metabolic Transition ◽  
Bud Growth

The activity of ascorbic acid oxidase (AAO) was studied in apple (Malus domestica Borkh.) buds during dormancy and thidiazuron-induced budbreak. In dormant buds, activity of AAO was low compared with buds that were treated with thidiazuron and had resumed growth. An increase in AAO activity began at the time of metabolic transition from dormancy to budbreak. The highest level of activity was reached 10 days after thidiazuron induction during the expansion growth phase. In vitro AAO activity of apple bud extract was increased by addition of Cu (CuSO) and inhibited by Cu-chelating agents, diethyldithiocarbamate (DDC), sodium azide (NaN), and 8-hydroxyquinoiine (8-OH-Q). In vivo treatment of apple buds with Cu-chelating agents inhibited AAO activity and bud growth but not budbreak. Chemical name used: N- phenyl -N' -1,2,3-thidiazol-5-ylurea (thidiazuron).

scholarly journals Is Ceruloplasmin an Ascorbic Acid Oxidase?

1962 ◽  
Vol 237 (11) ◽  
pp. 3455-3457
Author(s):  
Anatol G. Morell ◽  
Philip Aisen ◽  
I. Herbert Scheinberg
Keyword(s):  
Ascorbic Acid ◽  
Acid Oxidase ◽  
Ascorbic Acid Oxidase

The Chemical Nature of "Ascorbic Acid Oxidase"

Science ◽  
1937 ◽  
Vol 86 (2219) ◽  
pp. 35-35
Author(s):  
Elmer H. Stotz ◽  
Carter J. Harrer ◽  
C. G. King
Keyword(s):  
Ascorbic Acid ◽  
Chemical Nature ◽  
Acid Oxidase ◽  
Ascorbic Acid Oxidase

scholarly journals Ascorbic Acid Oxidase in Barley Roots

1955 ◽  
Vol 30 (2) ◽  
pp. 174-181 ◽  
Author(s):  
S. I. Honda
Keyword(s):  
Ascorbic Acid ◽  
Acid Oxidase ◽  
Ascorbic Acid Oxidase

Phytochrome-mediated induction of ascorbic acid oxidase in mustard seedlings

1969 ◽  
Vol 56 (8) ◽  
pp. 417-417 ◽  
Author(s):  
M. van Poucke ◽  
F. Barthe ◽  
H. Mohr
Keyword(s):  
Ascorbic Acid ◽  
Acid Oxidase ◽  
Ascorbic Acid Oxidase

Oxidative Stress of Crops Monitored by EPR

1993 ◽  
Vol 48 (9-10) ◽  
pp. 766-772 ◽  
Author(s):  
Hartmut B. Stegmann ◽  
Paul Schuler
Keyword(s):  
Oxidative Stress ◽  
Ascorbic Acid ◽  
Acid Oxidase ◽  
Ascorbic Acid Oxidase ◽  
Acid Radical ◽  
In Vivo Epr ◽  
Signal Intensities

Abstract Treatment of leaves of spinach, corn, and peas with the herbicides paraquat, amitrole or acifluorfen leads to oxidative stress resulting in a light driven drastically increased production of ascorbic acid radical (m̱onoḏehydroa̱scorbic acid, MDAA) which could be demonstrated by in vivo EPR analysis. A discrimination of the MDAA formation between the action of elec­tron uncouplers and catalase inhibitors can be achieved by observation of the radical rise kinetics. Significant MDAA signal intensities are detected in the darkness likewise. These signals are probably due to the action of ascorbic acid oxidase activated by membrane destruction.

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