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Helen A. Ax

Hoffmann-La Roche

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Publication

Featured researches published by Helen A. Ax.

The Journal of Antibiotics | 1974

Antimetabolites produced by microorganisms. X. L-2-amino-4-(2-aminoethoxy)-trans-3-butenoic acid.

David L. Pruess; James P. Scannell; Martha Kellett; Helen A. Ax; Jean Janecek; Thomas H. Williams; Arthur Stempel; Julius Berger

The Journal of Antibiotics | 1983

Ro 22-5417, a new clavam antibiotic from Streptomyces clavuligerus. II. Fermentation, isolation and structure.

Ralph H. Evans; Helen A. Ax; A. Jacoby; Thomas H. Williams; E. Jenkins; James P. Scannell

The Journal of Antibiotics | 1975

Antimetabolites produced by microorganisms. XII (S)-alanyl-3-[alpha-(S)-chloro-3-(S)-hydroxy 2-oxo-3-azetidinylmethyl]-(S)-alanine, a new beta-lactam containing natural product.

James P. Scannell; David L. Pruess; John F. Blount; Helen A. Ax; Martha Kellett; Florence Weiss; Thomas C. Demny; Thomas H. Williams; Arthur Stempel

The Journal of Antibiotics | 1973

Antimetabolites produced by microorganisms. VII. L-(N5-phosphono)methionine-S-sulfoximinyl-L-alanyl-L-alanine.

David L. Pruess; James P. Scannell; Helen A. Ax; Martha Kellett; Florence Weiss

The Journal of Antibiotics | 1972

ANTIMETABOLITES PRODUCED BY MICROORGANISMS. VI 1) L-N5-(1-IMINOETHYL) ORNITHINE

James P. Scannell; Helen A. Ax; David L. Pruess; Thomas H. Williams; Thomas G. Demny; Arthur Stempel

The Journal of Antibiotics | 1992

Dactylocyclines, novel tetracycline derivatives produced by a Dactylosporangium sp. II. Structure elucidation.

Adrienne A. Tymiak; Helen A. Ax; Mark S. Bolgar; Alicia D. Kahle; Michael A. Porubcan; Niels H. Andersen

The Journal of Antibiotics | 1976

A NEW SEMISYNTHETIC MACROLIDE ANTIBIOTIC 3-O-OLEANDROSYL-5-O-DESOSAMINYLERYTHRONOLIDE A OXIME

Ronald Andrew Lemahieu; Helen A. Ax; John F. Blount; Mathew Carson; Carl W. Despreaux; David L. Pruess; James P. Scannell; Florence Weiss; Richard W. Kierstead

The Journal of Antibiotics | 1992

Dactylocyclines, novel tetracycline derivatives produced by a Dactylosporangium sp.. III: Absolute stereochemistry of the dactylocyclines

Pratik V. Devasthale; Lester A. Mitscher; Hanumaiah Telikepalli; David Vander Velde; Jing-Yuan Zou; Helen A. Ax; Adrienne A. Tymiak

The Journal of Antibiotics | 1974

Antimetabolites produced by microorganisms. XI. 1-(S)-hydroxy-2-(S,S)-valylamido-cyclobutane-1-acetic acid.

David L. Pruess; James P. Scannell; John F. Blount; Helen A. Ax; Martha Kellettt; Homas H. Williams; Arthur Stempel

The Journal of Antibiotics | 1976

Antimetabolites produced by microorganisms. XIII. The synthesis and microbiological production of a novel amino acid, L-2-amino-4-(2-aminoethoxy) butanoic acid.

James P. Scannell; David L. Pruess; Helen A. Ax; Abraham Jacoby; Martha Kellett; Arthur Stempel

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James P. Scannell

Hoffmann-La Roche

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David L. Pruess

Hoffmann-La Roche

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Arthur Stempel

Hoffmann-La Roche

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Thomas H. Williams

Hoffmann-La Roche

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Martha Kellett

Hoffmann-La Roche

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Florence Weiss

Hoffmann-La Roche

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John F. Blount

Princeton University

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A. Jacoby

Hoffmann-La Roche

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Adrienne A. Tymiak

Bristol-Myers Squibb

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E. Jenkins

Hoffmann-La Roche

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