Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Helen A. Ax"'
Autor:
Niels H. Andersen, Alicia D. Kahle, D. Vander Velde, J S Wells, P. Principe, Mark S. Bolgar, Carol Ann Aklonis, P. V. Devasthale, L. A. Mitscher, Helen A. Ax, Donald R. Kirsch, Adrienne A. Tymiak, J.‐Y. Zou, Joseph O'sullivan, William H. Trejo, Michael A. Porubcan, Hanumaiah Telikepalli
Publikováno v:
ChemInform. 24
Autor:
Adrienne A. Tymiak, D. Vander Velde, Hanumaiah Telikepalli, P. V. Devasthale, Jing-Yuan Zou, Helen A. Ax, Lester Mitscher
Publikováno v:
The Journal of Antibiotics. 45:1907-1913
The dactylocycline antibiotics were found through circular dichroism measurements, NMR spectroscopy and chemical transformations to possess the usual tetracycline family absolute configuration at carbons 4, 4a, 5a and 12a. The absolute stereochemistr
Autor:
Richard A. Dalterio, Dieter M. Drexler, Stella Huang, John E. Leet, Ron Huang, Helen A. Ax, Wenying Li, James A. Matson, Joseph L. Cantone, Kin Sing Lam
Publikováno v:
ChemInform. 34
Autor:
James A. Matson, Richard A. Dalterio, Joseph L. Cantone, Kin Sing Lam, Dieter M. Drexler, John E. Leet, Helen A. Ax, Ron Huang, Stella Huang, Wenying Li
Publikováno v:
The Journal of antibiotics. 56(3)
A new group of thiazolyl peptide antibiotics, the nocathiacins, was isolated from cultured broth of Nocardia sp. The major analogs nocathiacins I-III (1-3) were purified using silica gel and Sephadex LH-20 chromatography techniques. The structures of
Autor:
Helen A. Ax, Niels H. Andersen, Adrienne A. Tymiak, Alicia D. Kahle, Mark S. Bolgar, Michael A. Porubcan
Publikováno v:
The Journal of antibiotics. 45(12)
Fermentation of Dactylosporangium sp. (ATCC 53693) produces a mixture of tetracycline derivatives from which several related tetracycline glycosides, the dactylocyclines, were isolated and their structures determined. The most abundant glycoside in i
Autor:
Adrienne A. Tymiak, P. Principe, Joseph O'sullivan, William H. Trejo, Donald R. Kirsch, J S Wells, Helen A. Ax, Carol Ann Aklonis
Publikováno v:
The Journal of antibiotics. 45(12)
A screen for antibiotics with activity against tetracycline-resistant microorganisms has led to the isolation of Dactylosporangium sp. (ATCC 53693), a producer of several novel tetracycline derivatives. The major fermentation products, dactylocycline
Autor:
RONALD A. LEMAHIEU, HELEN A. AX, JOHN F. BLOUNT, MATHEW CARSON, CARL W. DESPREAUX, DAVID L. PRUESS, JAMES P. SCANNELL, FLORENCE WEISS, RICHARD W. KIERSTEAD
Publikováno v:
The Journal of Antibiotics. 29:728-734
A new antibiotic, 3-O-oleandrosyl-5-O-desosaminylerythronolide A oxime (3) was produced from erythronolide A oxime (1) by the oleandomycin-producing culture, Streptomyces antibioticus ATCC 11891. The structure of 3 was determined by degradative studi
Publikováno v:
The Journal of Antibiotics. 36:213-216
The purification of a new antibiotic, Ro 22-5417, was achieved by a variety of preparative column chromatographic methods. The antibiotic was obtained crystalline with an overall recovery of 3% after a 300-fold purification. The structure was determi
Autor:
Thomas C. Demny, Florence Weiss, Arthur Stempel, David L. Pruess, Thomas H. Williams, James P. Scannell, Martha Kellett, Helen A. Ax, John F. Blount
Publikováno v:
The Journal of Antibiotics. 28:1-6
(S)-Alanyl-3-[alpha-(S)-chloro-3-(S)-hydroxy-2-oxo-3-azetidinylmethyl]-(S)-alanine was isolated from a fermentation broth of an unidentified Streptomyces species 372 A. The structure was determined by single crystal X-ray diffraction analysis. The su
Autor:
Jean Janecek, Helen A. Ax, Arthur Stempel, Martha Kellett, Thomas H. Williams, David L. Pruess, Julius Berger, James P. Scannell
Publikováno v:
The Journal of Antibiotics. 27:229-233