Microbios最新文献_第10页

Correlation of actinomycin X2 to the lipid profile in static and shaken cultures of Streptomyces nasri strain YG62. 鼻窦链霉菌YG62静态和振荡培养中放线菌素X2与脂质谱的相关性

Microbios Pub Date : 1999-01-01

M Y el-Naggar, M A el-Kersh, A S el-Sharaky

{"title":"Correlation of actinomycin X2 to the lipid profile in static and shaken cultures of Streptomyces nasri strain YG62.","authors":"M Y el-Naggar, M A el-Kersh, A S el-Sharaky","doi":"","DOIUrl":"","url":null,"abstract":"Streptomyces nasri strain YG62 produces a broad-spectrum antibiotic designated actinomycin X2. The influence of static and shaken incubation on the production of actinomycin X2 and lipid profiles of S. nasri strain YG62 was investigated. It was found that shaken incubation was superior to the static process for both actinomycin X2 (2-fold) and total lipids (1.6-fold). Triglyceride and phospholipid levels paralleled the actinomycin X2 production with an increase in the triglyceride (2.8-fold) and phospholipid (1.2-fold) concentrations in the shaken culture over the static incubation. Analysis of fatty acid patterns revealed the occurrence of a wide range of fatty acids (C10-C22). The mean percentage of total saturated fatty acids in shaken culture was higher than those of the static culture. The mean percentage of mono-unsaturated fatty acids was almost the same in both cultures. The mean percentage of the total polyunsaturated fatty acids in the static culture was slightly higher than that of the shaken culture. The polyunsaturated/saturated fatty acid ratio (P/S) was higher in the static culture compared with the shaken culture. A positive correlation was recorded between triglycerides, phospholipids and actinomycin X2. A negative correlation on the other hand, was found between fatty acids and actinomycin X2.","PeriodicalId":18494,"journal":{"name":"Microbios","volume":"100 396","pages":"117-27"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21440880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of the raw extract of Arthrinium strains (Hyphomycetes, Dematiaceae) on the growth of pathogenic bacteria in poultry feed. 蓟马菌(菌丝菌，马马菌科)生提物对家禽饲料中致病菌生长的影响。

Microbios Pub Date : 1999-01-01

H Aissaoui, M Agut, M A Calvo Torras

引用次数: 0

Phylogenetic characterization of Centipeda periodontii, Selenomonas sputigena and Selenomonas species by 16S rRNA gene sequence analysis. 利用16S rRNA基因序列分析牙周蜈蚣、脓硒单胞菌和硒单胞菌的系统发育特征。

Microbios Pub Date : 1999-01-01

S Sawada, S Kokeguchi, F Nishimura, S Takashiba, Y Murayama

{"title":"Phylogenetic characterization of Centipeda periodontii, Selenomonas sputigena and Selenomonas species by 16S rRNA gene sequence analysis.","authors":"S Sawada, S Kokeguchi, F Nishimura, S Takashiba, Y Murayama","doi":"","DOIUrl":"","url":null,"abstract":"The nearly complete 16S rRNA gene sequences for oral Gram-negative anaerobic motile bacteria, Centipeda periodontii, Selenomonas sputigena and Selenomonas species (formerly S. sputigena type strain), were determined in order to unveil their relationship to other oral motile bacteria. To determine the phylogenetic characterization of these bacteria, their 16S rRNA gene sequences were obtained and compared with those from the ribosomal sequence databases previously reported. The 16S rRNA gene sequences of these bacteria were similar to those of Selenomonas ruminantium and Schwartzia succinivorans isolated from rumens, and to Pectinatus cerevisiiphilus isolated from spoiled beer. Among oral bacteria, the nucleotide sequence analysis of these bacteria revealed high nucleotide similarity to Veillonella species, whereas low similarity to oral motile bacteria such as Campylobacter species. Phylogenetic analysis clearly confirmed that C. periodontii and two Selenomonas species were classified as relatives of a group besides Selenomonas, Schwartzia, and Pectinatus species, and not as close relatives to oral motile bacteria, such as Campylobacter species. These results suggest that such oral Gram-negative anaerobic motile bacteria are close relatives of oral bacteria.","PeriodicalId":18494,"journal":{"name":"Microbios","volume":"98 391","pages":"133-40"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21328835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High temperature induced antibiotic sensitivity changes in Pseudomonas aeruginosa. 高温诱导铜绿假单胞菌的抗生素敏感性变化。

Microbios Pub Date : 1999-01-01

A R Bhatti, K Kumar, C Stobo, G R Chaudhry, J M Ingram

{"title":"High temperature induced antibiotic sensitivity changes in Pseudomonas aeruginosa.","authors":"A R Bhatti, K Kumar, C Stobo, G R Chaudhry, J M Ingram","doi":"","DOIUrl":"","url":null,"abstract":"Pseudomonas aeruginosa, which was resistant to a wide variety of antibiotics, became sensitive to several of these antibiotics when grown and tested at 46 degrees C. Cell wall antibiotics such as penicillin G and ampicillin were only effective when added to cells growing at 46 degrees C prior to a temperature shift to 37 degrees C. Antibiotics which penetrate the cytoplasmic membrane to express their inhibiting action present a pattern different from those which are active against the outer cell wall. In order that these compounds be effective, the permeability of the cytoplasmic membrane must be further altered with agents such as EDTA which allow the penetration of actinomycin D. Inhibitors of protein synthesis, such as streptomycin and chloramphenicol, have increased access to their sites of action in cells grown at 46 degrees C. Cells grown at 46 degrees C have 40% less lipopolysaccharide (LPS) than cells grown at 37 degrees C and the LPS aggregates were of large molecular size in cells grown at 46 degrees C. Growth at 46 degrees C affects the permeability properties of the outer cell wall more than the permeability properties of the cytoplasmic membrane and this was due, in part, to the selective release of LPS of LPS-protein complexes at elevated growth temperatures.","PeriodicalId":18494,"journal":{"name":"Microbios","volume":"97 387","pages":"103-15"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21317742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of ultraviolet light irradiation and nitrosoguanidine on viability of 46 strains of Arthrinium and their antibiotic production. 紫外光照射和亚硝基胍对46株Arthrinium菌活力及其抗生素产量的影响。

Microbios Pub Date : 1999-01-01

M A Calvo, M Agut, R M Calvo, J Larrondo

引用次数: 0

Effects of glucose and phenylalanine upon 2,4,6-trichlorophenol degradation by Pseudomonas paucimobilis S37 cells in a no-growth state. 葡萄糖和苯丙氨酸对无生长状态下少动假单胞菌S37细胞降解2,4,6-三氯酚的影响

Microbios Pub Date : 1999-01-01

C Aranda, F Godoy, B González, J Homo, M Martínez

引用次数: 0

Stimulatory effects of endotoxin on the platelet secretory process. 内毒素对血小板分泌过程的刺激作用。

Microbios Pub Date : 1999-01-01

J Saluk-Juszczak, B Wachowicz, W Kaca