SHREE KUMAR APTE
Articles written in Journal of Biosciences
Volume 5 Issue 3 September 1983 pp 225-233
Two filamentous, nitrogen fixing cyanobacteria were examined for their salt tolerance and sodium (Na+) transport.
Volume 6 Issue 5 December 1984 pp 771-794
Sodium affects the metabolism of eukaryotes and prokaryotes in several ways. This review collates information on the effects of Na+ on the metabolism of cyanobacteria with emphasis on the N2,fixing filamentous species. Na+ is required for nitrogenase activity in
Na+ influx in
Na+ requirement in nitrogen metabolism including nitrate assimilation, synthesis of amino acids and proteins, in respiration and oxidative phosphorylation, in transport of sugars and amino acids, cellular distribution of absorbed sodium, physiological basis of salt tolerance and prospects of reclamation of saline soils by cyanobacteria are the other aspects discussed in this review.
Volume 21 Issue 3 May 1996 pp 397-411
When deprived of combined nitrogen, aerobically-grown filaments of
Volume 29 Issue 2 June 2004 pp 153-161
Potassium deficiency enhanced the synthesis of fifteen proteins in the nitrogen-fixing cyanobacterium
Volume 32 Issue 3 April 2007 pp 559-568 Articles
K+, the dominant intracellular cation, is required for various physiological processes like turgor homeostasis, pH regulation etc. Bacterial cells have evolved many diverse K+ transporters to maintain the desired concentration of internal K+. In
Volume 35 Issue 3 September 2010 pp 427-434 Articles
Nitrogen-fixing cultures of two species of the filamentous, heterocystous cyanobacterium
Volume 41 Issue 2 June 2016 pp 193-203 Article
A third generation promoter probe shuttle vector pKG was constructed, using the green fluorescent protein as a reporter, for in situ evaluation of Deinococcal promoter activity in Escherichia coli or Deinococcus radiodurans. The construct yielded zero background fluorescence in both the organisms, in the absence of promoter sequences. Fifteen deinococcal promoters, either harbouring Radiation and Desiccation Response Motif (RDRM) or not, were cloned in vector pKG. Only the RDRM-promoter constructs displayed (i) gamma radiation inducible GFP expression in D. radiodurans, following gamma irradiation, (ii) DdrO-mediated repression of GFP expression in heterologous E. coli, or (iii) abolition in GFP induction following gamma irradiation, in pprI mutant of D. radiodurans. Utility of pKG vector for real-time in situ assessment of deinococcal promoter function was, thus, successfully demonstrated.
Volume 43 Issue 1 March 2018 pp 15-23 Article
Presence of low concentrations (1–2%) of ethanol during irradiation exhibited significant protection against DNA damagecaused by very high doses (2–12 kGy) of 60Co-gamma-rays in vitro. Radiation-induced DNA damage was substantiallyreduced in different types of DNA molecules (chromosomal DNA from Anabaena 7120 or Deinococcus radiodurans orbacteriophage Lambda, and plasmid pBluescript DNA) when irradiated in the presence of ethanol, thus indicating thegeneric nature of ethanol protection. The radioprotection appeared to be a consequence of the well known ability of ethanolto scavenge hydroxyl radicals. Addition of ethanol during 6 kGy irradiation also reduced DNA damage in vivo andimproved post-irradiation growth recovery of Anabaena 7120 cultures. To our knowledge, this is the first instance of abilityof very low ethanol concentrations to protect DNA from damage triggered by extremely high doses of 60Co-gamma rays.
Volume 46, 2021
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