𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A thermoluminescence study of the effects of nitrite on photosystem II in spinach thylakoids

✍ Scribed by Archna Sahay; Anjana Jajoo; Sudhakar Bharti

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
197 KB
Volume
21
Category
Article
ISSN
1522-7235

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The site of action of nitrite on PS II was investigated by measuring the TL profile of nitrite‐treated spinach thylakoid membranes. Three bands were observed in control, which were identified as the Q band (7Β°C), the B band (24Β°C) and the C band (57Β°C). In the presence of 20 mmol/L nitrite, the intensity of the Q band decreased, the B band upshifted to 46Β°C but the C band disappeared. The suppression of the Q band and the upshift of the B band suggested that nitrite caused inhibition at the water oxidizing complex. The effects of nitrite also remained the same in the presence of chloride. In case of ion‐sufficient thylakoid membranes, nitrite decreased the Q band peak intensity and caused an upshift in the B band peak temperature. Nitrite showed similar effects in the presence of DCMU. This suggested that the site of action of nitrite is not at the acceptor side but at the donor side of PS II. The inhibition shown by nitrite has been found to be specific for nitrite anion. No other anions such as formate, fluoride or nitrate, were effective. Copyright Β© 2006 John Wiley & Sons, Ltd.

πŸ“œ SIMILAR VOLUMES

Disorganization of the Mn4Ca complex of
Disorganization of the Mn4Ca complex of photosystem II by ruthenium red: a thermoluminescence study
✍ Alain Gauthier; Robert Carpentier πŸ“‚ Article πŸ“… 2009 πŸ› John Wiley and Sons 🌐 English βš– 306 KB πŸ‘ 1 views

## Abstract Ruthenium red (RR) is known to be an inhibitor that binds to Ca^2+^ sites. It releases Ca^2+^ and Cl^βˆ’^ together with the extrinsic polypeptide of 17 kDa associated with the oxygen evolving complex of photosystem II. In this work we used thermoluminescence to study S~2/3~Q~B~^βˆ’^ and S~2

Effect of wall growth on the kinetic mod
Effect of wall growth on the kinetic modeling of nitrite oxidation in a CSTR
✍ Spiros N. Dokianakis; Michael Kornaros; Gerasimos Lyberatos πŸ“‚ Article πŸ“… 2006 πŸ› John Wiley and Sons 🌐 English βš– 188 KB πŸ‘ 2 views

A simple kinetic model was developed for describing nitrite oxidation by autotrophic aerobic nitrifiers in a continuous stirred tank reactor (CSTR), in which mixed (suspended and attached) growth conditions prevail. The CSTR system was operated under conditions of constant nitrite feed concentration

The effect of metrizamide on the electro
The effect of metrizamide on the electroencephalogram: A prospective study in 61 patients
✍ Dr. Allan H. Ropper; Keith H. Chiappa; Robert R. Young πŸ“‚ Article πŸ“… 1979 πŸ› John Wiley and Sons 🌐 English βš– 403 KB πŸ‘ 2 views

## Abstract A prospective study was made of changes in the electroencephalogram after the use of metrizamide for myelography and posterior fossa cisternography in 61 patients (62 studies). The EEG changed in 21 patients (34%); 3 of these had had previously abnormal records, and the abnormalities we