Uroporphyrin from Turacin: a Simplified Method

Isolation of unequivocal uroporphyrin III; a further study of turacin.

Urobiliverdin, a New Bile Pigment Deriving from Uroporphyrin

5-Aminolevulinic acid is incubated with a crude enzyme extract from Rhodopseudomonas spheroides, mutant R 26. The formed porphyrins (main product: uroporphyrin III) are isolated. Incorporation o f iron, ring-splitting by coupled oxydation and subsequent iron removal leads to a mixture o f pigments, from which urobiliverdin, a new bile pigment with eight carboxylic acid side chains, is isolated....

A simplified method for extracting androgens from avian egg yolks.

Female birds deposit significant amounts of steroid hormones into the yolks of their eggs. Studies have demonstrated that these hormones, particularly androgens, affect nestling growth and development. In order to measure androgen concentrations in avian egg yolks, most authors follow the extraction methods outlined by Schwabl (1993. Proc. Nat. Acad. Sci. USA 90:11446-11450). We describe a simp...

A Simplified Method for Handwritten Character Recognition from Document Image

This paper presents a simple and effective technique for converting handwritten textual character from paper document into machine readable form. The proposed method takes the scanned image of the handwritten character from paper document as input and shows the recognized character as its output. Using this method, the object in the converted binary image is segmented and is resized in a global...

An Electron Spin Resonance Study of Copper Uroporphyrin 3 and Other Touraco Feather Components.

The only known naturally occurring copper-containing porphyrin was discovered almost 100 years ago by Church (1) who isolated this material from the tail and wing feathers of 16 species of the African touraco bird (Musophagidae). At that time, he noted that this red, base-soluble pigment, which he called turacin, contained 7% copper and that the feathers from which it was derived represented a ...