摘要:
THE YIELD OF AICAR BY FERMENTATION OF OTHERWISE CONVENTIONAL CULTURE MEDIA BY MEANS OF CERTAIN STRAINS OF BACILLUS SURBTILIS AND BACILLUS MEGATERIUM IS SHARPLY INCREASED WHEN THE MEDIA ARE NEUTRALIZED BY MEANS OF GASEOUS AMMONIA AND CONTAIN MORE THAN 10 MG./DL. MAGNESIUM IONS.
摘要:
CERTAIN MUTANTS OF ESCHERICHIA COLI WHICH REQUIRE ISOLEUCINE FOR GROWTH AND CAN GROW IN THE PRESENCE OF MORE THAN 1 MG./1. A-AMINO-B-HYDROXY-VALERIC ACID IN AN OTHERWISE CONVENTIONAL CULTURE MEDIUM PRODUCE 6-THREONINE IN AMOUNTS OF SEVERAL GRAMS PER LITER OF THE MEDIUM.
摘要:
PYRIDINE DERIVATIVES WHICH ARE KNOWN PRECURSORS OF VITAMIN B6 ARE PREPARED FROM OXAZOLE DERIVATIVES OF THE FORMULA
2-(R3-OOC-),4-(R1-CH2-),5-(R2-O-)OXAZOLE
WHEREIN R1 IS HYDROGEN, CARBOXY, OR CARBO-LOWER ALKOXY, R2 IS LOWER ALKYL, AND R3 IS HYDROGEN OR LOWER ALKYL BY PARTIAL DECARBOXYLATION AND FURTHER REACTIONS IN A KNOWN MANNER, OR BY DIELS-ALDER REACTION WITH SUITABLE DIENOPHILES. THE OXAZOLE DERIVATIVES ARE PREPARED BY REACTING A DIALKYL OXALATE WITH AN ESTER OF ALANINE OR ASPARTIC ACID TO THE CORRESPONDING N-ALKOXALYL AMINO ACID ESTER, AND CLOSING THE OXAZOLE RING BY MEANS OF A DEHYDRATING AGENT AND AN ORGANIC BASE.