(n.) A colorless crystalline substance, C6H3.CH3.(OH)2, which is obtained from certain lichens (Roccella, Lecanora, etc.), also from extract of aloes, and artificially from certain derivatives of toluene. It changes readily into orcein.
Example Sentences:
(1) Analyses of mucoproteins, orcin-positive protein sugar, sialic acid of the alpha2-macroglobulin, alpha1-glycoprotein, alpha1-antitrypsin, alpha2-HS-glycoprotein and beta2-glycoprotein I were carried out in 302 diabetics.
(2) Nucleic acids were extracted and concentratons of DNA determined spectrophotometrically at 600 nm with diphenylamine reagent and RNA determined with orcinal reagent.
(3) In the liver homogenate with ethyl alcohol the RNA extraction was modified according to the data given by OGUR and ROSEN (1950); RNA determination was done colorimetrically using orcin hydrochloric acid.
(4) Guanosine was reacted with DMBA-5,6-oxide to yield a mixture of N-7-alkylguanines along with a smaller amount of an orcine positive product exhibiting an ultraviolet spectrum resembling that of DMBA-5,6-dihydrodiol.
(5) In creases of concentration could be proved for alpha2-macroglobulin, alpha2-HS-glycoprotein, orcin-positive protein sugar and sialic acid.
Orpin
Definition:
(n.) A yellow pigment of various degrees of intensity, approaching also to red.