In earlier studies it was found that the effects of urethane could be reversed by folic acid and thymidine but not by uridine. It was further shown that urethane-treated chick embryos were unable to convert serine to glycine, homocysteine to methionine and uridine to thymidine, all of which are folate-dependent reactions. Due to the sensitivity of folic acid auxotrophs towards small amounts of folates present in the biological material, the folic acid contents of urethane-treated and untreated chick embryos are studied, using microbial assay. It is found that there is a statistically significant reduction in the total folate content of chick embryos treated with urethane as compared to those from the untreated controls. It is concluded that urethane has an antifolate action.

Keywords:
Chick embryos, Urethane, Antifolate action, Microbial assay
This content is only available via PDF.
© 1980 S. Karger AG, Basel
1980
Copyright / Drug Dosage / Disclaimer
Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher.
Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.
You do not currently have access to this content.