摘要:
A novel antibiotic BN-235 substance and a process for making it are described, wherein the hydrochloride thereof has the following properties:Elemental analysis values:carbon 55.44%hydrogen 6.41%nitrogen 9.02%chlorine 12.01%oxygen 17.12% (balance)Molecular weight: about 520 (by the vapor pressure method)Melting point: 230.degree. to 232.degree. C. (decomp.)Ultraviolet absorption spectrum: shown in FIG. 1Infrared absorption spectrum: shown in FIG. 2Color reactions:Positive: ninhydrin and LemieuxNegative: Sakaguchi and ferric chlorideColor and form: yellow powderSolubility: soluble in methanol, ethanol, acetone and water, and insoluble in ether, n-hexane and petroleum etherStability: stable at a pH of 2 to 6Rf values in thin-layer chromatography (silica gel):chloroform-methanol (4:1) 0.73n-butanol-acetic acid-water (2:1:1) 0.64Distinction among acidity, neutrality and basicity:basic.
摘要:
A BN-213 substance-producing strain of the genus Pseudomonas is cultivated to produce BN-213 substance in a culture medium. The BN-213 substance is isolated from the culture medium and purified, and proved to be a novel antibiotic.
摘要:
A 7.alpha.-methoxycephalosporin derivative represented by the formula (I): ##STR1## wherein R.sub.1 represents a heterocyclic ring or an --S-- heterocyclic ring; R.sub.2 represents a hydrogen atom, a carboxy group or a --COOR.sub.5 group wherein R.sub.5 represents a lower alkyl group, a dialkylamino-lower alkyl group or a ##STR2## group wherein R.sub.6 represents a lower alkyl group, a lower acyl group or a lower alkoxycarbonyl group and Y represents a hydrogen atom or a lower alkyl group; R.sub.3 represents a hydrogen atom, a carbamoyl group or a lower acyl group; R.sub.4 represents a hydrogen atom, a lower alkyl group, a dialkylamino-lower alkyl group or a ##STR3## group wherein R.sub.6 and Y are defined as above; A and B, which may be the same or different, each represents a straight chain or branched chain alkylene group having 1 to 5 carbon atoms; and x represents 0 or 1; or a pharmaceutically acceptable salt thereof and a process for producing the same.
摘要:
An antibiotic BN-200 substance produced by cultivating a BN-200 substance strain of the genus Erwinia and a process for producing the BN-200 substance.
摘要:
A new antibiotic designated as SF-1623 substance exhibiting a useful antibacterial activity against gram-negative bacteria is now produced by cultivating a new strain ATCC 21999 of the known species Streptomyces chartreusis. The SF-1623 substance in the form of its an alkali metal salt may be recovered from the culture when the cultivation is effected under aerobic conditions in the presence of an alkali metal thiosulfate.
摘要:
A new antibiotic designated BN-130 substance is now provided, which has antibacterial activity against gram-negative and gram-positive bacteria as well as acid-fast bacteria. BN-130 substance is produced by cultivating a strain of Pseudomanas stutzeri under aerobic conditions.
摘要:
A new polymeric compound, MF-300, is provided, which possesses a specific protective activity against bacterial infections caused particularly by Pseudomonas aeruginosa. The compound is derived from the reaction of ribostamycin with crotonoyl chloride followed by concentration of the reaction product and by subsequent recovery therefrom of a fraction having a range of molecular weights of 10,000.about.100,000 when measured by ultrafiltration method.
摘要:
L-2-Amino-4-methylphosphinobutyric acid (L-MPGA) which is useful as bactericide and herbicide can be prepared by optical resolution of its racemic mixture, D,L-MPGA with the action of a microbial acylase. The process comprises providing D,L-MPGA in the form of its N-acyl derivative, reacting N-acyl-D,L-MPGA in an aqueous medium with a microbial acylase having an optically specific hydrolytic activity, whereby selectively eliminating the acyl group of N-acyl-L-MPGA to give a mixture of L-MPGA and N-acyl-D-MPGA and isolating L-MPGA from the mixture. The acylase is produced by cultivating a microbial strain belonging to the genus Pseudomonas, Streptomyces or Aspergillus, particularly Pseudomonas maltophilia BN-233, Streptomyces violascens SF 2072, Streptomyces diastatochromogenes SF 2073, Aspergillus sp. KS-101 or Aspergillus sp. KS-102.
摘要翻译:用作杀菌剂和除草剂的L-2-氨基-4-甲基膦酰基丁酸(L-MPGA)可以通过其微生物酰基转移酶的作用通过其外消旋混合物D,L-MPGA的光学拆分来制备。 该方法包括提供其N-酰基衍生物形式的D,L-MPGA,使N-酰基-D,L-MPGA在水性介质中与具有光学特异性水解活性的微生物酰基转移酶反应,从而选择性地除去酰基 的N-酰基-L-MPGA,得到L-MPGA和N-酰基-D-MPGA的混合物,并从混合物中分离L-MPGA。 酰基转移酶是通过培育属于假单胞菌属,链霉菌属或曲霉属的微生物菌株而产生的,特别是麦芽假单胞菌BN-233,链霉菌属Streptomyces violascens SF 2072,Streptomyces diastatochromogenes SF 2073,曲霉属(Aspergillus sp。 KS-101或曲霉属 KS-102。
摘要:
Essentially pure plasmids derived from Actinomycetes are described which have at least one restriction cleavage site for specific restriction enzyme and have molecular weight of less than 1.0.times.10.sup.7.
摘要:
New antibiotics, SF-2050 substance and SF-2050B substance are produced by cultivating a microorganism Streptomyces sp. SF-2050 now deposited under FERM-P 4358 and under ATCC. 31450 in a liquid culture medium under aerobic conditions, and these antibiotics may be isolated from the fermentation broth and useful as an antibacterial agent. These antibiotics have an activity inhibitory to .beta.-lactamase.