• Hari K Kaul

      Articles written in Journal of Biosciences

    • Evidence for the possible involvement of the superoxide radicals in the photodegradation of bilirubin

      Ravi Kaul Hari K Kaul Prakash C Bajpai C R Krishna Murti

      More Details Abstract Fulltext PDF

      The photodecomposition of bilirubin follows first order kinetics with akB value of 12.5 × 10-3 min-1. In the presence of a model system generating superoxide anions, such as xanthine-xanthine oxidase, thekB value was 103 × 10-3 min-1 This ten-fold enhancement ofkB value by xanthine-xanthine oxidase was abolished when the reaction mixture was supplemented with a superoxide ion scavenger— superoxide dismustase. Further, known singlet oxygen quenchers like Β-carotene and bistidine did not prevent the enhancement of bilirubin oxidation by xanthine-xanthine oxidase, thereby ruling out the obligatory conversion of Superoxide anion to singlet oxygen. It is concluded that radical oxygen mediated bilirubin degradation might be a natural catabolic route for the bile pigment degradation during oxygen stress.

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    • To trigger further research on plant mitochondria, the Journal of Biosciences is bringing out a special issue titled "Plant Mitochondria: Properties and Interactions with Other Organelles".

      Plant mitochondria are quite distinct and have unique features, such as a cyanide-insensitive alternate pathway. They also interact with chloroplasts to optimize photosynthetic carbon assimilation.

      Submissions are welcome until 30 July 2023. The contributions can be original articles, short communications, reviews, or mini-reviews on any topic related to plant mitochondria.

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      Posted on April 12, 2023
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