• M Sharma

      Articles written in Journal of Biosciences

    • Alteration in the acceptor side of photosystem II of chloroplast by high light

      U Dwivedi R Bhardwaj M Sharma

      More Details Abstract Fulltext PDF

      The effect of high light on the acceptor side of photosystem II of chloroplasts and core particles of spinach was studied. BothVmax and apparentKm for DCIP were altered in photoinhibited photosystem II core particles. The double reciprocal plot analysis as a function of actinic light showed increased slope in chloroplasts photoinhibited in the presence of DCMU. Exposure of chloroplasts to high light in the presence of DCMU did not protect the chloroplast against high light induced decrease in Fm, level. Further the high light stress induced decrease inFm level was not restored by the addition of DCMU. These results suggest that the high light stress induced damage to chloroplast involves alteration in the binding site forQB on the DI protein on the acceptor side of photosystem II

    • The evolution and distribution of life in the Precambrian eon-Global perspective and the Indian record

      M Sharma Y Shukla

      More Details Abstract Fulltext PDF

      The discovery of Precambrian microfossils in 1954 opened a new vista of investigations in the field of evolution of life. Although the Precambrian encompasses 87% of the earth’s history, the pace of organismal evolution was quite slow. The life forms as categorised today in the three principal domains viz. the Bacteria, the Archaea and the Eucarya evolved during this period. In this paper, we review the advancements made in the Precambrian palaeontology and its contribution in understanding the evolution of life forms on earth. These studies have enriched the data base on the Precambrian life. Most of the direct evidence includes fossil prokaryotes, protists, advanced algal fossils, acritarchs, and the indirect evidence is represented by the stromatolites, trace fossils and geochemical fossils signatures. The Precambrian fossils are preserved in the form of compressions, impressions, and permineralized and biomineralized remains.

  • Journal of Biosciences | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.