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The regulating mechanism of miRNA on p53 dynamics in p53−MDM2−miRNA model network incorporating reactive oxygen species (ROS) is studied. The study shows that miRNA drives p53 dynamics at various states, namely, stabilized states and oscillating states (damped and sustain oscillation). We found the co-existence of these states within certain range of the concentartion level of miRNA in the syst...

Decomposer fungi continually deplete the organic resources they inhabit, so successful colonization of new resources is a crucial part of their ecology. Colonization success can be split into (i) the ability to arrive at, gain entry into, and establish within a resource and (ii) the ability to persist within the resource until reproduction and dissemination. Fungi vary in their life history str...

Although historically reactive oxygen species have been implicated as a potential cause of ageing, recent evidence suggests that a modest increase in oxidants can actually extend lifespan. A new study suggests that, in Caenorhabditis elegans, reactive oxygen species regulate longevity through a pathway classically linked to apoptosis.

Department of Plant Systems Biology, Flanders Institute for Biotechnology, and Department of Molecular Genetics, Ghent University, B–9052 Gent, Belgium (F.V.B.); Center for Plant Cell Biology and Department of Botany and Plant Sciences, University of California, Riverside, California 92521 (J.B.-S.); Department of Biochemistry and Molecular Biology, University of Nevada, Reno, Nevada 89557 (R.M...

Here, we show that resistance of Escherichia coli to TiO2 photocatalysis involves defenses against reactive oxygen species. Results support the idea that TiO2 photocatalysis generates damage which later becomes deleterious during recovery. We found this to be partly due to DNA attack via hydroxyl radicals generated by the Fenton reaction during recovery.

The concept of trade-offs is central to our understanding of life-history evolution. The underlying mechanisms, however, have been little studied. Oxidative stress results from a mismatch between the production of damaging reactive oxygen species (ROS) and the organism's capacity to mitigate their damaging effects. Managing oxidative stress is likely to be a major determinant of life histories,...