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Titolo:
Influence of sodium ion on heavy metal-induced inhibition of light-regulatd proton efflux and active carbon uptake in the cyanobacterium Anabaena flos-aquae
Autore:
Sharma, SK; Singh, DP; Shukla, HD; Ahmad, A; Bisen, PS;
Indirizzi:
Univ Massachusetts, Dept Chem & Biochem, N Dartmouth, MA 02747 USA Univ Massachusetts N Dartmouth MA USA 02747 em, N Dartmouth, MA 02747 USA Univ Massachusetts, Dept Microbiol, Amherst, MA 01003 USA Univ Massachusetts Amherst MA USA 01003 Microbiol, Amherst, MA 01003 USA Barkatullah Univ, Dept Microbiol, Bhopal 462026, India Barkatullah Univ Bhopal India 462026 ept Microbiol, Bhopal 462026, India Babasahab Bhimrao Ambedkar Univ, Lucknow 228025, Uttar Pradesh, India Babasahab Bhimrao Ambedkar Univ Lucknow Uttar Pradesh India 228025 India
Titolo Testata:
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
fascicolo: 7, volume: 17, anno: 2001,
pagine: 707 - 711
SICI:
0959-3993(200110)17:7<707:IOSIOH>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
VARIABILIS;
Keywords:
Anabaena flos-aquae; carbon fixation; electron transport chain; heavy metal; oxygen generation; proton efflux;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Sharma, SK Univ Massachusetts, Dept Chem & Biochem, N Dartmouth, MA 02747 USA Univ Massachusetts N Dartmouth MA USA 02747 outh, MA 02747 USA
Citazione:
S.K. Sharma et al., "Influence of sodium ion on heavy metal-induced inhibition of light-regulatd proton efflux and active carbon uptake in the cyanobacterium Anabaena flos-aquae", WORLD J MIC, 17(7), 2001, pp. 707-711

Abstract

The light-induced proton efflux and active carbon uptake are inhibited by mercury and cadmium ions in Anabaena flos-aquae. The inhibitory effects of these heavy metal ions are reversed by 40 mM concentration of sodium. Here we report that light-induced proton efflux is sodium-dependent which leads to a characteristic enhancement in the rate of photosynthetic oxygen generation and carbon fixation. A low concentration (10 muM) of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) significantly inhibited the rate of oxygen generation while 10 muM carbonyl cyanide-m-chlorophenylhydrazone (CCCP) completely blocked the oxygen generation activity in the organism. The chlorophyll-a fluorescence yield indicates that little fluorescence quenching occurred in the absence of sodium ion. Increasing the extracellular sodium ion accelerated both the initial rate and the extent of fluorescence quenching. These results support the assumption that metal-induced inhibition of the photosynthetic machinery may be mediated by the movement of protons.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/01/20 alle ore 01:13:23