Ethylene enhances reactivity of superoxide with peroxidase to form the oxy-ferrous complex

Biochemistry ◽  
1983 ◽  
Vol 22 (7) ◽  
pp. 1645-1650 ◽  
Author(s):  
Alan M. Smith ◽  
Wendy L. Morrison ◽  
Paul J. Milham
Keyword(s):  
Ferrous Complex

scholarly journals Studies on the Organic Analytical Reagents. V-VI. V. Ferrous Complex Salts of cr-Picolinic Acid and Quinaldic Acid.

1954 ◽  
Vol 75 (1) ◽  
pp. 44-46
Author(s):  
Koichiro Shinra ◽  
Koichi Yoshikawa ◽  
Takeshi Kato ◽  
Yasuaki Nomizo
Keyword(s):  
Picolinic Acid ◽  
Quinaldic Acid ◽  
Analytical Reagents ◽  
Complex Salts ◽  
Ferrous Complex

Serum Iron Determination

1956 ◽  
Vol 2 (3) ◽  
pp. 175-183 ◽  
Author(s):  
George R Kingsley ◽  
Gloria Getchell
Keyword(s):  
Serum Iron ◽  
Isoamyl Alcohol ◽  
Photometric Measurement ◽  
Normal Range ◽  
Iron Determination ◽  
Acid Hydrolysate ◽  
Dry Ashing ◽  
Reproducible Method ◽  
Good Agreement ◽  
Ferrous Complex

Abstract 1. A sensitive, reproducible method for serum iron determination has been developed employing extraction of serum acid hydrolysate with isoamyl alcohol and development of a highly colored ferrous complex of 4,7-diphenyl-1, 1O-phenanthroline for quantitative photometric measurement of iron. 2. The method gives good recoveries and also good agreement with the dry-ashing procedure. 3. A normal range of 120-200 µg./100 ml. (average 160) for the female and 125-238 µg./100 ml. (average 182) for the male for serum iron was obtained by the method.

A high potential ferrous complex and its conversion to an alkylperoxoiron(III) intermediate: A lipoxygenase model

1993 ◽  
Vol 51 (1-2) ◽  
pp. 83
Author(s):  
Yan Zang ◽  
Timothy E. Elgren ◽  
Yanhong Dong ◽  
Lawrence Que
Keyword(s):  
High Potential ◽  
Ferrous Complex

Analysis and Calculation of Electrodeposition Process of Zn Alloy Coatings

2010 ◽  
Vol 139-141 ◽  
pp. 386-389
Author(s):  
Yun Ying Fan ◽  
Dong Hua Chen ◽  
Xiao Jing Liu
Keyword(s):  
Iron Content ◽  
Alloy Coating ◽  
Corrosion Performance ◽  
Electrodeposition Process ◽  
Real Concentration ◽  
Sulphate Bath ◽  
The Relationship ◽  
Zn Alloy ◽  
Acidic Sulphate ◽  
Ferrous Complex

Electrodeposited Zn-Fe alloy coating has good anti-corrosion performance and has been widely applied to protect steel materials from corrosion. In this paper, Zn-Fe alloy coatings were plated from acidic sulphate bath, and the relationship between real concentration of metallic complexes ([ZnL+] and [FeL+]) in the bath, which was calculated through solving nonlinear equations by METLAB software, and components of alloy coatings was studied. When ZnSO4•7H2O added in the bath increases from 10 g/L to 50 g/L, the ratio of ferrous complex to total complex decreases from 81.96% to 46.76%, simultaneously the iron content in Zn-Fe alloy coatings decreases from 26.82% to 6.32%. As FeSO4•7H2O and (NH4)2SO4 added in the bath increases from 40 g/L to 80 g/L respectively, the ratio of ferrous complex to total complex increases from 50.02% to 66.23% and from 58.65% to 60.37% respectively, simultaneously the iron content in coatings increases from 8.26% to 13.77% and from 9.28% to 11.92% respectively. The results show that variation of concentration of metallic complexes in the bath can lead to variation of components of coating proportionally.

scholarly journals A method for the estimation of iron in biological material

1930 ◽  
Vol 107 (750) ◽  
pp. 205-214 ◽  
Keyword(s):  
Picolinic Acid ◽  
Complex Salt ◽  
Optical Isomers ◽  
Salt Formation ◽  
Simple Method ◽  
Pure Product ◽  
Complex Salts ◽  
Living Material ◽  
The Stability ◽  
Ferrous Complex

The intense red colour and the stability of the product of reaction between ferrous salts and αα′ dipyridyl has remained a striking instance of complex salt formation since the discovery of this dipyridyl by Blau (1888). Although for obvious reasons this compound would seem a good reagent for the colorimetric estimation of iron, it has never been used to any extent for the purpose, without doubt because there are other more sensitive and accessible reagents. It seems, however, to possess unique advantages for the study of iron in connection with living material, and on its account it was thought advisable to bring αα′ dipyridyl, as a reagent for iron, to the notice of biologists. αα′ dipyridyl was first prepared by Blau (1888) by distilling the copper salt of α picolinic acid; the yield is small, but this method has the advantage of readily yielding a pure product. Recently Hein and Retter (1928) have found a relatively simple method of preparation by heating pyridine in a sealed tube with an oxidising agent such as ferric chloride, which removes hydrogen without the formation of water. This method though more economical needs greater manipulation to produce the substance in a state of purity. Smith (1926) isolated the same substance by the oxidation of sodium pyridines with dry air above 100° C. The ferrous complex salts were examined by Werner (1912) who showed that they could be resolved into two optical isomers. The ferrous salts of αα′ dipyridyl have the formula [Fe(C 10 H 8 N 3 ) 3 ]X 2 (Blau, 1898) where X is a monovalent acid radicle, and from the fact that the optical isomers do not racemize at once (Werner, 1912) dissociation into free ferrous salts must be relatively slight. They differ from the normal ferrous salts in not being eaily oxidised, in fact only powerful agents such as permanganate or chlorine oxidise them to a blue compound. This latter compound, which should be the ferric complex salt, is not obtained directly from ferric salts and αα′ dipyridyl and passes very easily into the red ferrous salt.

scholarly journals PARTICIPATION OF A NON-RESPIRATORY FERROUS COMPLEX DURING MITOSIS IN ROOTS

1962 ◽  
Vol 13 (3) ◽  
pp. 373-381 ◽  
Author(s):  
J. E. Amoore
Keyword(s):  
Carbon Monoxide ◽  
Cytochrome Oxidase ◽  
Hydrogen Cyanide ◽  
Iron Complex ◽  
Cent Oxygen ◽  
Root Tips ◽  
Systematic Survey ◽  
Divalent State ◽  
Pea Root ◽  
Ferrous Complex

A systematic survey was undertaken, of the effects of carbon monoxide and hydrogen cyanide (in the presence of 20 per cent oxygen), in darkness and light, on the relative rates of respiration, mitosis, and interphase in pea root tips. The inhibition of respiration by carbon monoxide was light-sensitive, but the inhibition by hydrogen cyanide was light-stable. The inhibitions were presumably due to combination of the inhibitor with the iron of cytochrome oxidase, in its divalent and trivalent forms respectively. In contrast, the inhibitions of mitosis by both poisons proved to be light-sensitive. The light-sensitive inhibition of mitosis by carbon monoxide shows that an iron complex is responsible for the process. That the inhibition of mitosis by hydrogen cyanide is also light-reversible shows that, in contrast with cytochrome oxidase, the mitotic iron complex remains always in the divalent state. The relative affinities of the mitotic ferrous complex, in molar units, were 0.68 for CO/O2, and 0.37 for HCN/O2. The properties of the complex are analogous to, yet distinct from, Gastrophilus haemoglobin and reduced cytochrome oxidase. It is considered that the arrest of mitosis by oxygen lack, carbon monoxide, and hydrogen cyanide is definitely due to interference with this unidentified, non-respiratory ferrous complex.

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