• pathways
  • The growing sources and altered transport pathways of global nitrogen cycling have consequently provided an increasing interaction of excess Nr with the atmospheric transport and removal mechanism. (springer.com)
  • enzymes
  • These enzymes play an important role in the catabolism of purines in some species, including humans. (wikipedia.org)
  • hypoxanthine (one oxygen atom) xanthine (two oxygens) uric acid (three oxygens) Because XO is a superoxide-producing enzyme, with general low specificity, it can be combined with other compounds and enzymes and create reactive oxidants, as well as oxidize other substrates. (wikipedia.org)
  • Bacterial
  • Mycobacterium tuberculosis is an obligate pathogenic bacterial species in the family Mycobacteriaceae and the causative agent of tuberculosis. (wikipedia.org)
  • hepatic
  • van Golen RF, van Gulik TM, Heger M (2012) Mechanistic overview of reactive species-induced degradation of the endothelial glycocalyx during hepatic ischemia/reperfusion injury. (springer.com)
  • conditions
  • Under anoxic conditions, the predominant double-base lesion is a species in which C8 of guanine is linked to the 5-methyl group of an adjacent 3'-thymine (G[8,5- Me]T). Most of these oxygen-derived species are produced at a low level by normal aerobic metabolism. (wikipedia.org)