Comment: On the Decomposition of Aqueous Sodium Dithionite

1971 ◽  
Vol 49 (7) ◽  
pp. 1140-1141 ◽  
Author(s):  
M. Wayman ◽  
W. J. Lem
Keyword(s):  
Mode Of Action ◽  
Kinetic Equations ◽  
Sodium Dithionite ◽  
Aqueous Sodium

In response to a comment by L. Burlamacchi, G. Guarini, and E. Tiezzi, kinetic equations for the decomposition of aqueous sodium dithionite are compared, and the mode of action of catalysts and anti-catalysts for the decomposition is discussed.

Decomposition of aqueous dithionite. Part II. A reaction mechanism for the decomposition of aqueous sodium dithionite

1970 ◽  
Vol 48 (5) ◽  
pp. 782-787 ◽  
Author(s):  
M. Wayman ◽  
W. J. Lem
Keyword(s):  
Induction Period ◽  
Sodium Dithionite ◽  
Side Reactions ◽  
Induction Phase ◽  
Time Curve ◽  
Rapid Phase ◽  
Aqueous Sodium ◽  
Ph Values ◽  
Decomposition Time ◽  
Rate Limiting

The decomposition of dilute aqueous sodium dithionite has been studied in unbuffered solutions by means of continuous polarography, accompanied by recorded pH values. The decomposition–time curve began with a slow "induction" period followed by an S-shaped rapid phase. The pH values decreased slightly during the induction period and increased considerably during the rapid phase. The addition of a solution of fresh decomposition products eliminated the induction phase. The addition of sulfide also eliminated the induction period and catalyzed the reaction. The accepted stoichiometry (2) of the reaction was confirmed. The following sequence of reactions is proposed[Formula: see text][Formula: see text]In the presence of H2S and possibly S formed in side reactions which consume H+, reaction [5] is catalyzed and may be represented as[Formula: see text]and[Formula: see text]The rate equation is represented as[Formula: see text]Reaction [4] is rate limiting during the induction period and reaction [5] (catalyzed), during the rapid phase of decomposition.

Comment: On the Decomposition of Aqueous Sodium Dithionite

1971 ◽  
Vol 49 (7) ◽  
pp. 1139-1140 ◽  
Author(s):  
L. Burlamacchi ◽  
G. Guarini ◽  
E. Tiezzi
Keyword(s):  
Aqueous Solution ◽  
Sodium Dithionite ◽  
Aqueous Sodium ◽  
Work Done ◽  
Dithionite Ion

The mechanism proposed by M. Wayman and W. J. Lem for the decomposition of dithionite ion in aqueous solution is reconsidered in the light of previous work done by the authors.

Effects of 5-5'-Diphenyl-2-thiohydantoin (DPTH) and Thyroxine on the Ultrastructure and Chemical Composition of Rat Liver

1971 ◽  
Vol 29 ◽  
pp. 570-571
Author(s):  
E. A. Elfont ◽  
R. B. Tobin ◽  
D. G. Colton ◽  
M. A. Mehlman
Keyword(s):  
Chemical Composition ◽  
Rat Liver ◽  
Future Study ◽  
Mode Of Action ◽  
Liver Mitochondria ◽  
Rat Liver Mitochondria ◽  
Effective Inhibitor ◽  
Biochemical Effects ◽  
Glycerophosphate Dehydrogenase ◽  
Stimulation Of

Summary5,-5'-diphenyl-2-thiohydantoin (DPTH) is an effective inhibitor of thyroxine (T4) stimulation of α-glycerophosphate dehydrogenase in rat liver mitochondria. Because this finding indicated a possible tool for future study of the mode of action of thyroxine, the ultrastructural and biochemical effects of DPTH and/or thyroxine on rat liver mere investigated.Rats were fed either standard or DPTH (0.06%) diet for 30 days before T4 (250 ug/kg/day) was injected. Injection of T4 occurred daily for 10 days prior to sacrifice. After removal of the liver and kidneys, part of the tissue was frozen at -50°C for later biocheailcal analyses, while the rest was prefixed in buffered 3.5X glutaraldehyde (390 mOs) and post-fixed in buffered 1Z OsO4 (376 mOs). Tissues were embedded in Araldlte 502 and the sections examined in a Zeiss EM 9S.Hepatocytes from hyperthyroid rats (Fig. 2) demonstrated enlarged and more numerous mitochondria than those of controls (Fig. 1). Glycogen was almost totally absent from the cytoplasm of the T4-treated rats.

On Kinetic Equations in Heavy-Ion Physics

1996 ◽  
Vol 21 (5) ◽  
pp. 461-502 ◽  
Author(s):  
E. Suraud
Keyword(s):  
Kinetic Equations ◽  
Heavy Ion ◽  
Heavy Ion Physics
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