(n.) A composition of quicksilver, tin, and sulphur, forming a yellow powder, sometimes used by mediaeval artists, for the sake of economy, instead of gold.
Example Sentences:
Purpurin
Definition:
(n.) A dyestuff resembling alizarin, found in madder root, and extracted as an orange or red crystalline substance.
Example Sentences:
(1) A cDNA for purpurin, a secreted 20,000 dalton neural retina cell adhesion and survival protein, has been sequenced and expressed in mammalian cells.
(2) Purpurin was not retained intracellularly and did not bind to TTR coupled to Sepharose.
(3) Purpurins, which have strong absorption bands above 650 nm.
(4) The 20,000-mol-wt protein, called retinal purpurin (RP), stimulates neural retina cell-substratum adhesion and prolongs the survival of neural retina cells in culture.
(5) In 30-day tumor regrowth studies, 70% of animals treated with the metallopurpurin derivative SnET2 were free of tumors while 50% of the animals treated with the free-base purpurin ET2 were free of tumor.
(6) In spite of UV-vis and mass spectroscopic similarities, the "purpurin" 7 differs from the "purpurins" 6a,b by the loss of ring A.
(7) The synthesis of purpurins from etioporphyrin I and coproporphyrin I proceeds in high yield and with a high degree of regioselectivity.
(8) Product formation can be rationalized in terms of relief of steric strain about the periphery of the purpurin macrocycle.
(9) Purpurin mRNA is found in both embryonic and adult retina, but not the brain, heart, or liver.
(10) In contrast to RBP, purpurin was not retained in vitamin A-deficient HeLa cells.
(11) Purpurin and the serum RBP are, however, different molecules, for the serum protein is approximately 3,000 D larger than purpurin and has different silver-staining characteristics.
(12) Most interestingly, anti-purpurin and anti-HSPG bound only to one end of adhesive filaments.
(13) Purpurin derivatives, a group of synthetic photosensitizers, were tested for their photodynamic activity against transplantable N-[4-(5-nitro-2-furyl)-2-thiazolyl]formamide-induced urothelial tumors growing in male Fischer 344 rats.
(14) In contrast to RBP, expressed purpurin did not bind to transthyretin (TTR).
(15) Purpurins are a class of porphyrin derivative that have been shown to have good in vivo cytotoxicity to N-[4-(5-nitro-2-furyl)-2-thiazolyl]formamide (FANFT) induced rat bladder tumors (AY-27) implanted into Fisher 344 rats.
(16) Finally, purpurin supports the survival of dissociated ciliary ganglion cells, indicating that RBPs can act as ciliary neurotrophic factors.
(17) A 20,000-D protein called purpurin has recently been isolated from the growth-conditioned medium of cultured embryonic chick neural retina cells (Schubert, D., and M. LaCorbiere, 1985, J.
(18) Purpurin binds retinol and may play a major role in retinol transport across the interphotoreceptor cell matrix.
(19) Ferritin iron was released by a number of bipyridyl radicals including those derived from diquat and paraquat, the anthracycline radicals of adriamycin, daunorubicin and epirubicin, the semiquinones of anthraquinone-2-sulphonate, 1,5 and 2,6-dihydroxyanthraquinone, 1-hydroxyanthraquinone, purpurin, and plumbagin, and the nitroaromatic radicals of nitrofurantoin and metronidazole.
(20) In V79 cells, only HA with 2 hydroxy groups in the 1,3 positions (1,3-DHA, purpurin, emodin) or with a hydroxymethyl sidechain (lucidin and aloe-emodin) were mutagenic.