Über das Auftreten von Tetrahydrobiopterin und Riboflavin in den Malpighischen Gefäßen von Drosophila melanogaster und deren Mutante brown

Abstract

This paper is concerned with the different occurrence of tetrahydrobiopterin (THB) and riboflavine in the Malpighian tubules (MT) of the wild-type and of the eye color mutant brown (bw) of Drosophila melanogaster during different stages of development and life. In the MT of the mutant brown there is a strong reduction of THB and riboflavine contents in proportion to the amounts of the MT of the wild-type. Furthermore, in the mutant brown the THB, similar like isoxanthopterin and uric acid, disappears out of the MT soon after hatching. The results are discussed with regard to biogenetic coherences.