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  • concentrations
  • Ann Neurol 1990;28.556-560 Elevated serum and urine concentrations of neopterin (dihydroneopterin), a pteridine compound that has been considered a marker of cell-mediated immune reactions 111, have been found to correlate with the Walter Reed stage of human immunodeficiency virus type 1 (HIV-1)infection [2-41. (docme.ru)
  • pigments
  • The identification of pteridine-related genes and their possible involvement in color patterning is a novel finding in spiders and one that suggests a biochemical link between guanine deposits and the pigments exhibited by these species. (biomedcentral.com)
  • Hydrolysis
  • In this paper we report Negishi coupling reactions on 6-benzenesulfonatepteridine, selective hydrolysis of the protecting groups to give exclusively the 6-substituted 2,4-diamino-pteridine and 6-substituted pterins. (scielo.org.za)
  • creatinine
  • In their letter, Drs. Reibnegger and Fuchs identify several potential concerns regarding our recent publication that evaluated the normalization performance of urine specific gravity (USG) and urinary creatinine with respect to the diagnostic properties of selected pteridines in discerning aggressive and benign breast cancers. (mst.edu)
  • respectively
  • 3 Other methods include the condensation of pyrimidone or pyrimidine ring with a substituted glyoxal, α -carbonylmethylene group and α -haloketones to give the corresponding 6-substituted pterin and pteridine rings, respectively ( Scheme 2 ). (scielo.org.za)