منابع مشابه
The Natural Occurrence of Ethionine in Bacteria
Two unknown radioactive areas appeared after radioautography and two dimensional paper chromatography of culture medium in which Escherichia coli was grown. These materials were studied by paper chromatography and paper electrophoresis of several derivatives and identified as ethionine and ethionine sulfone, the latter an artifact. Chromatographic coincidence of the unknowns and their derivativ...
متن کاملThe stability and natural occurrence of margarite
MARGARITE is a calcic dioctahedral mica that has been known since the mid nineteenth century but rarely found as a mineral of petrographic interest. The most widely developed occurrences are in regional metamorphic rocks of unusual composi t ion-bauxite carbonate sediments that have been metamorphosed to varying degrees (Onay, I949) and in contact metamorphism of similar rocks (Williams, 1888)....
متن کاملWidespread Natural Occurrence of Hydroxyurea in Animals
Here we report the widespread natural occurrence of a known antibiotic and antineoplastic compound, hydroxyurea in animals from many taxonomic groups. Hydroxyurea occurs in all the organisms we have examined including invertebrates (molluscs and crustaceans), fishes from several major groups, amphibians and mammals. The species with highest concentrations was an elasmobranch (sharks, skates and...
متن کاملOccurrence of aflatoxin B1 in natural products
The media claims for the consumption of natural resource-based food have gradually increased in both developing and developed countries. The interest in the safety of these products is partially due to the possible presence of toxigenic fungi acting as mycotoxin producers, such as aflatoxins produced during the secondary metabolism of Aspergillus flavus, A. parasiticus and A. nomius. Aflatoxins...
متن کاملNatural Occurrence of Ochratoxin A Contamination in Commercial Spices in Tehran
Background and Objectives: Non-sanitary conditions during the drying, transport and storage stages in the production of spices could introduce mycotoxin contamination. The aim of the current study was to determine the concentration of ochratoxin A (OTA) in 92 commercial spices (including red pepper, black pepper, turmeric and cinnamon) imported to Iran. Materials and Methods: OTA levels were...
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ژورنال
عنوان ژورنال: Bulletin of the Chemical Society of Japan
سال: 1969
ISSN: 0009-2673,1348-0634
DOI: 10.1246/bcsj.42.1468