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1.
  • Elsik, Christine G., et al. (författare)
  • The Genome Sequence of Taurine Cattle : A Window to Ruminant Biology and Evolution
  • 2009
  • Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 324:5926, s. 522-528
  • Tidskriftsartikel (refereegranskat)abstract
    • To understand the biology and evolution of ruminants, the cattle genome was sequenced to about sevenfold coverage. The cattle genome contains a minimum of 22,000 genes, with a core set of 14,345 orthologs shared among seven mammalian species of which 1217 are absent or undetected in noneutherian (marsupial or monotreme) genomes. Cattle-specific evolutionary breakpoint regions in chromosomes have a higher density of segmental duplications, enrichment of repetitive elements, and species-specific variations in genes associated with lactation and immune responsiveness. Genes involved in metabolism are generally highly conserved, although five metabolic genes are deleted or extensively diverged from their human orthologs. The cattle genome sequence thus provides a resource for understanding mammalian evolution and accelerating livestock genetic improvement for milk and meat production.
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2.
  • Fernandez, Esther, et al. (författare)
  • Electron transfer reactions, cyanide and O-2 binding of truncated hemoglobin from Bacillus subtilis
  • 2013
  • Ingår i: Electrochimica Acta. - : Elsevier BV. - 0013-4686. ; 110, s. 86-93
  • Tidskriftsartikel (refereegranskat)abstract
    • The truncated hemoglobin from Bacillus subtilis (trHb-Bs) possesses a surprisingly high affinity for oxygen and resistance to (auto)oxidation; its physiological role in the bacterium is not understood and may be connected with its very special redox and ligand binding reactions. Electron transfer reactions of trHb-Bs were electrochemically studied in solution and at graphite electrodes. Spectrophotometrical potentiometric titration and direct electrochemical measurements gave a heme iron redox potential of -103 +/- 4 mV and -108 +/- 2 mV vs. NHE, at pH 7, respectively. The redox potential of the heme in trHb-Bs shifted -59 mV per pH unit at pH higher than 7, consistently with a 1e(-)/1H(+) - transfer reaction. The heterogeneous rate constant k(s), for a quasi-reversible 1e(-)-1H(+) - transfer reaction between graphite and trHb-Bs was 10.1 +/- 2.3 s(-1). Upon reversible cyanide binding the ks doubled, while the redox potential of heme shifted 21 mV negatively, presumably reflecting changes in redox activity and in vivo signaling functions of trHb-Bs associated with ligand binding Bioelectrocatalytic reduction of O-2 catalyzed by trHb-Bs was one of the most efficient hitherto reported for Hbs, with an apparent catalytic rate constant, k(cat), of 56 +/- 6s(-1). The results obtained are of particular interest for applications of trHb in environmental biosensing and toxicity screening. (C) 2013 Elsevier Ltd. All rights reserved.
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  • Resultat 1-4 av 4

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