English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The conversion of folic acid to citrovorum factor (N5-formyl tetrahydrofolic acid) had been demonstrated for preparations of Streptococcusfaecalis (Broquist et al., 1953), Lactobacillus arabinosus (Hendlin et al., 1953), Lactobacillus casei (Bond, 1953), and a number of animal tissues (Winsten and Eigen, 1950; Nichol and Welch, 1950; Nichol, 1952). It has been shown that ascorbic acid, ATP,3 Mg+, DPN, and a source of a one-carbon unit (Nichol, 1954) are required for optimal conversion of folic acid to citrovorum factor or to an active formylating form of this vitamin. Pyridoxal phosphate, Mn, and TPN (Jaenicke, 1956) have been reported as needed for a one-carbon donor system involving serine. We wish to report the requirement of another cofactor for the conversion of folic acid to citrovorum factor by a preparation of L. casei, which is found in the boiled extract of crude enzyme preparations.

CONVERSION OF PTEROYLGLUTAMIC ACID TO THE CITROVORUM FACTOR BY PREPARATIONS FROM LACTOBACILLUS CASEI