scholarly journals Inhibition of Flower Senescence by 2,2'Dipryridyl

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 835B-835
Author(s):  
Michael Knee
Keyword(s):  
Metal Ions ◽  
Cellular Uptake ◽  
Ethylene Production ◽  
Chelating Agents ◽  
Flower Color ◽  
Flower Senescence ◽  
Ethylene Treatment ◽  
Rapid Shift

Chelating agents were applied to petunia flowers to test for the involvement of apoplastic metal ions in ethylene-induced senescence. Compounds varying in polarity and charge were applied directly to the corolla prior to a 24-h treatment with 1 ppm ethylene. Charged and polar chelators were inactive. The only compound that inhibited senescence was 2,2'-dipyridyl, and there was evidence of cellular uptake of this compound. Fe2+ and Zn2+ did not reverse the inhibition of senescence by dipyridyl. Cu2+ as low as 0.1 mM reversed the effect of dipyridyl, but the time of senescence was independent of ethylene treatment. Dipyridyl caused a rapid shift in flower color from red to blue, but untreated flowers became more blue than dipyridyl-treated during 9 days. CO2 and ethylene production were stimulated by ethylene, but inhibited by dipyridyl applied before or after a 24-h ethylene treatment. Continuous ethylene treatments did not reverse the delay of senescence by dipyridyl.

Study on desorption of Mn, Fe, and Mg from TMP and evaluation of the complexing strength of different chelating agents using side reaction coefficients 10th EWLP, Stockholm, Sweden, August 25–28, 2008

Holzforschung ◽  
2009 ◽  
Vol 63 (6) ◽  
Author(s):  
Kim Granholm ◽  
Pingping Su ◽  
Leo Harju ◽  
Ari Ivaska
Keyword(s):  
Citric Acid ◽  
Metal Ions ◽  
Chelating Agents ◽  
Side Reaction ◽  
Sodium Dithionite ◽  
Thermomechanical Pulp ◽  
Peroxide Bleaching ◽  
Ph Values ◽  
Reducing Environment ◽  
Ph Range

Abstract Chelation of thermomechanical pulp (TMP) was studied in this work. The desorption of Mn, Fe, and Mg due to their impact on peroxide bleaching was investigated. The desorption experiments were performed with EDTA, citric acid, oxalic acid, and formic acid as chelating agents at different pH. Chelation experiments with EDTA were carried out at pH 3–11. Sodium dithionite was used as the reducing agent in studying chelation with EDTA in a reducing environment. Mn was very effectively desorbed with EDTA from TMP at pH <10 and the reducing environment further improved the removal of all the studied metal ions from TMP with EDTA. Citric acid also removed Mn effectively from TMP at pH 5. The thermodynamic stability constants of different metal chelates do not present the correct picture of how strongly the metal ions are bound by the chelating agents in different conditions. But by means of the side reaction coefficients (α M(L)-coefficients) it is also theoretically possible to evaluate and compare the real binding strengths between the metal ions and different chelating agents at varying pH values and other solution conditions. In this study, a theory is given for the calculation of side reaction coefficients. Values of the α M(L)-coefficients, for the pH range 0–14, are presented for EDTA, DTPA, and also for some other new potential environmentally friendly chelating agents.

Competition between Cd(II) and other divalent transition metal ions during complex formation with amino acids, peptides, and chelating agents

2016 ◽  
Vol 327-328 ◽  
pp. 55-69 ◽  
Author(s):  
Maurizio Remelli ◽  
Valeria M. Nurchi ◽  
Joanna I. Lachowicz ◽  
Serenella Medici ◽  
M. Antonietta Zoroddu ◽  
...  
Keyword(s):  
Amino Acids ◽  
Complex Formation ◽  
Transition Metal ◽  
Metal Ions ◽  
Chelating Agents ◽  
Transition Metal Ions

o-hydroxyaroyl-isonicotinoyl hydrazones as chelating agents with divalent transition metal ions

1994 ◽  
Vol 19 (3) ◽  
Author(s):  
RamadanM. El-Bahnasawy ◽  
SomiaE. El-Meleigy ◽  
Abd-Alla El-Tawansi
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Chelating Agents ◽  
Transition Metal Ions

scholarly journals Inhibition of Ethylene Production in Banana Fruit Tissue by Ethylene Treatment

1971 ◽  
Vol 24 (4) ◽  
pp. 885 ◽  
Author(s):  
M Vendrell ◽  
WB Mcglasson
Keyword(s):  
Ethylene Production ◽  
Banana Fruit ◽  
Duration Of Treatment ◽  
Fruit Tissue ◽  
Ethylene Treatment ◽  
Chlorophyll Breakdown ◽  
Endogenous Ethylene ◽  
Exogenous Ethylene

A temporary ethylene treatment, sufficient to stimulate ripening in banana fruit tissue, partly suppresses endogenous ethylene production and the evolution of ethylene from methionine. The production of endogenous ethylene does not return to rates normal for naturally ripening fruit after the exogenous ethylene is removed. The extent of inhibition is related to the concentration of applied ethylene up to 5-10 p.p.m., and to the duration of treatment within the period 12 hI' to 3 days. Other characteristics of ripening appear to develop normally, except in the shorter treatments, where respiration shows a lower climacteric peak and chlorophyll breakdown is delayed.

Liquid—liquid extraction of metal ions with sulfonamide chelating agents

1983 ◽  
Vol 149 ◽  
pp. 235-252 ◽  
Author(s):  
Shunsuke Ide ◽  
Tsukasa Yoshida ◽  
Shugo Matsuno ◽  
Makoto Takagi ◽  
Keihei Ueno
Keyword(s):  
Metal Ions ◽  
Chelating Agents ◽  
Liquid Extraction ◽  
Liquid Liquid Extraction
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