共查询到17条相似文献，搜索用时 171 毫秒
1.
选取传统中药提取单体化合物α-倒捻子素和8-甲氧基补骨脂素,通过2种药物敏感性实验方法MABA(Microdilution Alamar Blue Assay)分析与试管法分别测定了两种化合物对结核分枝杆菌H37Rv(ATCC27294)和H37Ra(ATCC25177)的体外抗菌活性,同时还测定了9种阳性抗结核药物对这两种结核菌的最低抑菌浓度(MIC),比较2种方法的检测结果。结果表明:α-倒捻子素对结核分枝杆菌H37Rv(ATCC27294)和H37Ra(ATCC25177)的最低抑菌浓度均为6.25μg/mL,而8-甲氧基补骨脂素对结核分枝杆菌H37Rv(ATCC27294)和H37Ra(ATCC25177)的最低抑菌浓度均为128μg/mL。Alamar B1ue法与试管法相比较,完全符合率是90%(9/11),具有较好的一致性。本研究结果表明Mamar B1ue法是一种快速、简便测定药物对结核分枝杆菌MIC的方法。本研究为α-倒捻子素和8-甲氧基补骨脂素的进一步开发利用和抗分枝杆菌机制研究打下了基础。 相似文献
2.
MABA法与二倍稀释法测定齐墩果酸体外抗结核菌活性 总被引：1，自引：0，他引：1
为筛选有开发价值的抗结核中草药,通过儿拉姆兰微板分析法(MABA)与二倍稀释法分别测定齐墩果酸对结核分支杆菌H37Rv(ATCC 27294)和H37Ra(ATCC 25177)的体外抗菌活性,测定最低抑菌浓度(MIC),同时对两种方法的检测结果进行了比较;以噻唑蓝(MTT)法进行了齐墩果酸对Balb/c小鼠的脾细胞和肝细胞的细胞毒性试验。结果表明,齐墩果酸对这两种结核菌的最低抑菌浓度均为16μg/mL,对Balb/c小鼠的脾细胞和肝细胞均无毒性。MABA法与试管法相比较,完全符合率为90%(9/10),具有较好的一致性。本研究结果为齐墩果酸作为抗结核菌药物的开发及其抗菌机制研究奠定了一定的基础。 相似文献
3.
为筛选有开发价值的抗结核中草药,本研究通过MABA(Microdilution MABA Assay)与试管法分别测定蛇床子素和8-甲氧基补骨脂素对结核分支杆菌H37Rv(ATCC27294)和H37Ra(ATCC25177)的体外抗菌活性,即最低抑菌浓度(MIC),同时比较两种方法的检测结果;并以MTT法研究蛇床子素和8-甲氧基补骨脂素对Balb/C小鼠的脾细胞和肝细胞的细胞毒性试验。蛇床子素和8-甲氧基补骨脂素对这两种结核菌的最低抑菌浓度分别均为32μg/mL和128μg/mL,并且对BALB/c小鼠的脾细胞和肝细胞均无毒性。MABA法与试管法相比较,完全符合率为90%(9/11),具有较好的一致性。本研究为蛇床子素和8-甲氧基补骨脂素作为抗结核药物的开发及它们的抗菌机制研究奠定了基础。 相似文献
4.
试验研究东亚飞蝗成虫抗菌活性物质的萃取参数与抑菌效应。采用针刺蘸大肠杆菌菌悬液方法,以抗菌活性为指标,用杯碟法测定临床多重耐药菌的抑菌活性,确定最佳诱导时间,初步研究抗菌谱。结果表明,东亚飞蝗抗菌活性物质粗提液对革兰氏阳性菌(如金黄色葡萄球菌、枯草芽孢杆菌)或革兰氏阴性菌(如大肠杆菌、水稻白叶枯病原菌)均有一定的抑制作用。其抗菌谱为:金黄色葡萄球>水稻白叶枯病原菌>枯草芽孢杆菌>大肠杆菌,其中以对金黄色葡萄球菌的抑菌效果最明显。抗菌活性物质浓度为11.782mg/mL,蝗虫抗菌活性物质收率为8.623%。经纯化后的抗菌活性物质增强对革兰氏阳性菌或革兰氏阴性菌的抑制作用。采用针刺蘸大肠杆菌方式可成功诱导东亚飞蝗抗菌物质的表达,尤其以针刺蘸大肠杆菌诱导后饲养24h得到的抗菌活性物质抑菌活性最强。结果表明东亚飞蝗虫体内含有抗菌活性物质可被诱导表达,其抗菌作用机理有进一步研究。 相似文献
5.
研究选取中药单体18β-甘草次酸联合一线抗结核药物异烟肼(INH)、利福平(RFP)和链霉素(SM),利用MABA法检测其体外单独及联合作用于牛源结核分枝杆菌的抗菌活性。18β-甘草次酸单独作用于结核分枝杆菌标准株(ATCC 27294)和牛分枝杆菌标准株（ATCC 19210）的最低抑菌浓度（MIC）分别为50和100 μg/mL。临床分离的2株敏感株和6株耐药株的MIC值分别为25～50和100～200 μg/mL。18β-甘草次酸联合INH、RFP和SM作用于6株耐药株均具有协同作用,且MIC值明显下降,INH的MIC值下降2～32倍（FICIs 0.125～0.375）,RFP的MIC值下降4～8倍（FICIs 0.240～0.490）,SM的MIC值下降4～16倍（FICIs 0.165～0.460）。中药单体药物对正常细胞BHK-21具有较低的细胞毒性,对肝癌细胞SMMC具有较好抑制作用。结果表明,18β-甘草次酸与抗结核药物INH、RFP和SM联合使用对结核分枝杆菌具有较好的抗菌药理活性。 相似文献
6.
为探讨粪肠球菌在体外共培养条件下其生物膜形成、黏附能力和抗吞噬作用等生物学特性的变化,本研究以猪源粪肠球菌N41菌株为受试菌株,将其分别与大肠杆菌O157∶H7、沙门氏菌肠炎亚种ATCC 14028以及金黄色葡萄球菌ATCC 25923等参考菌株共培养,通过结晶紫染色法测定其生物被膜生成量,通过菌落计数对猪肠上皮细胞黏附情况和小鼠腹腔巨噬细胞的抗吞噬能力进行定量。结果显示,大肠杆菌O157∶H7对粪肠球菌N41菌株生物膜生成量、黏附作用和抗吞噬作用的变化均不明显(p0.05);沙门氏菌ATCC 14028对粪肠球菌N41菌株的黏附作用明显增强(0.01p0.05),而对其生物膜量和抗吞噬作用变化不明显(p0.05);而金黄色葡萄球菌ATCC 25923则对粪肠球菌N41菌株的生物膜量增加和黏附作用明显增强(p0.01),抗吞噬作用也所有增强(0.01p0.05)。上述研究结果表明,不同细菌与粪肠球菌共培养后对粪肠球菌影响不同,大肠杆菌和沙门氏菌对粪肠球菌毒力影响较小,金黄色葡萄球菌则明显促进粪肠球菌的致病特性。本研究阐明了粪肠球菌在与其它致病菌共培养时,其毒力表现有增强的风险。 相似文献
7.
采用微量稀释法分别测定黄芩苷对链球菌、沙门氏菌、大肠杆菌、巴氏杆菌和金黄色葡萄球菌的最低抑菌浓度(MIC)值。结果显示,黄芩苷对大肠杆菌和金黄色葡萄球菌的MIC为16μg/m L,对链球菌的MIC为64μg/m L,对沙门氏菌和巴氏杆菌无明显抑菌性。说明黄芩苷对猪大肠杆菌、金黄色葡萄球菌具有抗菌活性,对链球菌的抑菌性较差,对沙门氏菌和巴氏杆菌无明显抑菌性。 相似文献
8.
用高效液相色谱法(HPLC)检测制剂中甘草酸的含量,二倍肉汤稀释法检测其对金黄色葡萄球菌和大肠杆菌的最小抑菌浓度(MIC)和最小杀菌浓度(MBC)。结果显示:甘草颗粒中甘草酸的含量为1.451%。甘草颗粒对金黄色葡萄球菌的MIC和MBC分别为7.813g/L和15.625g/L;对大肠杆菌的抗菌活性并不明显。结果表明:利用HPLC检测甘草酸的含量,方法简单,易于操作,重复性好。甘草颗粒对金黄色葡萄球菌和大肠杆菌都有一定的抑菌活性,为其开发为广谱抗菌药提供了理论基础。 相似文献
9.
本研究旨在基于对细菌次级代谢产物的筛选,寻找新型非核糖体肽类抗菌物质。通过对烟台沿海地区的土壤、海水及近海常见海洋生物中的细菌进行培养,分离纯化得到细菌的单克隆,以大肠杆菌（E.coli）ATCC 25922和金黄色葡萄球菌ATCC 29213为指示菌进行初步筛选,以耐多黏菌素和碳青霉烯E.coli B2（blaNDM-5+mcr-1）和耐甲氧西林金黄色葡萄球菌（MRSA） T144作为指示菌对有活性的细菌进行二次筛选。通过提取基因组进行PCR扩增产物测序比对,确定活性菌种属。采用有机萃取法对细菌的次级代谢产物进行萃取,通过凝胶层析和制备液相色谱进行纯化,利用分析型液相色谱进行纯度检测,进—步利用质谱对纯化后的抗菌活性物质进行结构鉴定。测序结果表明,活性菌属于解淀粉酶芽孢杆菌种,将其命名为解淀粉酶芽孢杆菌9-14（活性菌9-14）。抑菌试验结果表明,活性菌9-14的代谢产物对金黄色葡萄球菌ATCC 29213、MRSA T144、E.coli ATCC 25922和E.coli B2均具有高效抑制作用。活性菌9-14代谢产物是由氨基酸链组成的环状脂肽,属于伊枯草菌素的衍生物。对活性菌9-14代谢产物的生物学特性及其抑菌谱研究发现,活性菌9-14的代谢产物具有良好的热稳定性和酸碱稳定性,该抗菌物质经胰蛋白酶、胃蛋白酶、蛋白酶K和木瓜蛋白酶处理后抗菌活性没有明显减弱,具有较好的稳定性;该抗菌物质对所用金黄色葡萄球菌和大肠杆菌同样具有抑制作用,对绿脓杆菌、肺炎克雷伯杆菌、粪肠球菌和蜡样芽孢杆菌均不表现活性。本研究得到一种新型的抗菌物质,以该抗菌物质为抗菌药物的前体,可为食品安全和疾病控制提供一定的参考依据。 相似文献
10.
《畜牧与兽医》2016,(8):8-11
通过对1,1-二苯基-2-苦肼基(DPPH)、超氧化物阴离子、羟自由基的清除试验,测定硫酸化酵母葡聚糖(s GSC)的抗氧化活性;通过测定s GSC对金黄色葡萄球菌、表皮葡萄球菌、猪链球菌、粪肠球菌、大肠杆菌、耐药金黄色葡萄球菌NY3等的最小抑菌浓度,评价s GSC体外抗菌活性。结果表明:s GSC对DPPH、超氧化物阴离子、羟自由基的清除率均随着s GSC的浓度的增加而增加,在浓度为5 mg/m L时,对3种自由基的清除率分别为89.72%、42.16%、83.41%,表明s GSC对3种自由基均有较好的清除作用,表现出了较好的抗氧化活性。s GSC对金黄色葡萄球菌、表皮葡萄球菌、猪链球菌、粪肠球菌的最小抑菌浓度均为80 mg/m L,而对大肠杆菌为40 mg/m L,表明s GSC对这几种菌具有一定的抑菌作用;而对NY3的最小抑菌浓度大于80 mg/m L,表明s GSC对耐药金黄色葡萄球菌没有抑菌作用。 相似文献
11.
Weinstein WL Moore PA Sanchez S Dietrich UM Wooley RE Ritchie BW 《American journal of veterinary research》2006,67(4):562-568
OBJECTIVE: To determine whether a novel third-generation chelating agent (8 mM disodium EDTA dehydrate and 20 mM 2-amino-2-hydroxymethyl-1, 3-propanediol) would act as an antimicrobial potentiator to enhance in vitro activity of antifungal medications against fungal isolates obtained from horses with mycotic keratitis. SAMPLE POPULATION: Fungal isolates (3 Aspergillus isolates, 5 Fusarium isolates, 1 Penicillium isolate, 1 Cladosporium isolate, and 1 Curvularia isolate) obtained from horses with mycotic keratitis and 2 quality-control strains obtained from the American Type Culture Collection (ATCC; Candida albicans ATCC 90028 and Paecilomyces variotii ATCC 36257). PROCEDURE: Minimum inhibitory concentrations (MICs) against fungal isolates for 4 antifungal drugs (miconazole, ketoconazole, itraconazole, and natamycin) were compared with MICs against fungal isolates for the combinations of each of the 4 antifungal drugs and the chelating agent. The Clinical and Laboratory Standards Institute microdilution assay method was performed by use of reference-grade antifungal powders against the fungal isolates and quality-control strains of fungi. RESULTS: Values for the MIC at which the antifungal drugs decreased the growth of an organism by 50% (MIC50) and 90% (MIC90) were decreased for the control strains and ophthalmic fungal isolates by 50% to 100% when the drugs were used in combination with the chelating agent at a concentration of up to 540 microg/mL. CONCLUSIONS AND CLINICAL RELEVANCE: The chelating agent increased in vitro activity of antifungal drugs against common fungal pathogens isolated from eyes of horses with mycotic keratitis. 相似文献
12.
头孢喹诺对临床分离菌株抗菌活性研究 总被引：1，自引：0，他引：1
本研究旨在评价头孢喹诺对上海市养殖场临床分离菌株的体外抗菌作用,为头孢喹诺的临床使用提供参考依据。从上海市养殖场分离并鉴定大肠杆菌、沙门氏菌、金黄色葡萄球菌和链球菌各若干株,采用微量肉汤稀释法测定头孢喹诺对各菌株的最小抑菌浓度（MIC）、最小杀菌浓度（MBC）,推算MIC50和MIC90,并绘制头孢喹诺对这4种细菌的杀菌动力学曲线。头孢喹诺对金黄色葡萄球菌、链球菌、沙门氏菌和大肠杆菌的MIC50分别为0.063、0.063、0.032、0.125 μg/mL,MIC90分别为0.125、0.125、0.125、0.25 μg/mL;在很小的浓度变化范围内头孢喹诺能够快速抑菌,在抑菌浓度为1倍或2倍MIC时,24 h内能杀灭金黄色葡萄球菌、大肠杆菌或链球菌、沙门氏菌。头孢喹诺对上述几种临床分离细菌具有很强的抑菌效果和杀菌活性。 相似文献
13.
Tiamulin activity was measured against 19 UK field isolates of Actinobacillus pleuropneumoniae collected between 2003 and 2009 and the type strain ATCC 27090 as a control, with the intention of comparing broth with serum as growth media. Broth microdilution MIC/MBC tests were performed in accordance with the Clinical and Laboratory Standards Institute (CLSI) guideline M31-A3, in 'Veterinary Fastidious Medium' (VFM) (supplemented Mueller-Hinton broth at pH 7.3) and in 100% swine serum. For improved precision, a modified, overlapping doubling-dilution series was used (tiamulin concentration range 0.3-72 μg/ml). The MBC was reported as the lowest concentration producing a 99.9% reduction in bacterial density in the sub-cultured well contents, relative to the starting inoculum. The mean MBC/MIC ratio for tiamulin against A. pleuropneumoniae in VFM was low (1.74:1), even though tiamulin is classed as a bacteriostatic drug. Only three of the 19 isolates and the reference strain grew in 100% serum and their MICs were higher than those determined in VFM. It is postulated that this difference was due to differences in pH of the matrices or binding of tiamulin to serum proteins or a combination of both factors. 相似文献
14.
15.
The susceptibility of bovine udder quarters colonized with Corynebacterium bovis to experimental infection with Staphylococcus aureus or Streptococcus agalactiae. 
下载免费PDF全文
下载免费PDF全文 Twenty bovine udder quarters colonized with Corynebacterium bovis SR6 and 20 uncolonized quarters were challenged by inoculation of Staphylococcus aureus Newbould 305 (ATCC 29740) into the teat cistern. The percentage of infection in quarters colonized with C. bovis (50%) was significantly lower than that in controls (100%). By similar challenge no significant difference was observed between the percentage of infection with Streptococcus agalactiae ATCC 27956 in 33 quarters colonized with C. bovis (70%) compared to 33 controls (87.9%). A total of 37 quarters colonized with C. bovis and 37 control quarters were challenged with Staph. aureus Newbould 305 (ATCC 29740) and Maxi (ATCC 27543) and Strep. agalactiae (ATCC 27956) by exposure of the teat orifice. The percentage of teat ducts colonized with C. bovis which became infected with either pathogen was not different from that for controls. 相似文献
16.
Elizabeth E. Hickey Stephen W. Page Darren J. Trott 《Journal of veterinary pharmacology and therapeutics》2020,43(5):499-507
The objective of this study was to determine the minimum inhibitory concentrations (MICs) and pharmacodynamic profiles of four ionophores (lasalocid, monensin, narasin and salinomycin) against staphylococcal isolates from clinical cases of human and veterinary staphylococcal infections, and to determine the effect of methicillin resistance on the antimicrobial activity of ionophores. Broth microdilution MIC testing was used to determine antimicrobial activity against 156 staphylococcal isolates of human and veterinary origin. Pharmacodynamic profiles were examined using time-kill kinetics profiles against an ATCC type strain of Staphylococcus aureus and a clinical isolate of methicillin-resistant Staphylococcus pseudintermedius. All tests were performed in accordance with CLSI guidelines. All four ionophores demonstrated antimicrobial activity against methicillin-resistant staphylococci at concentrations similar to those observed for methicillin-susceptible isolates of the same species. Testing of human and veterinary MRSA isolates also showed that MIC values were not influenced by the host origin of the isolates. Pharmacodynamic profiles were similar for both isolates tested across all four ionophores, with similar reductions in viable cell counts being observed over an 18- to 24-hr period. Lasalocid, monensin, narasin and salinomycin all demonstrated antimicrobial activity against staphylococcal isolates of human and veterinary origins, with activity being unaffected by methicillin resistance status, although some Staphylococcus species-specific effects were observed that require further investigation. 相似文献
17.
抗菌肽与抗生素的体外抗菌效果比较 总被引：17，自引：0，他引：17
应用由 Hancock实验室改进的微量肉汤稀释法测定了 cecropin P1、cecropin A、magainin 2、defensin 1、bactenecin、lactoferricin和 indolicidin等 7种抗菌肽和盐酸金霉素、去甲万古霉素、土霉素、强力霉素等 4种抗生素的体外抗菌活性 ,并且使用薄层琼脂糖孔穴扩散法比较了抗菌肽中 cecropin P1和 cecropin A与土霉素和呋喃唑酮对大肠杆菌 K88的抑菌效果。结果发现 ,抗菌肽与抗生素一样对几种革兰氏阳性菌和阴性菌都有不同程度的抗菌效果。其中 cecropin A、cecropin P1和 defensin1对大肠杆菌的 2个菌株 ATCC2 5 92 2和 K88的抗菌活性高于抗生素 ,defensin1是各种抗菌肽中对金黄色葡萄球菌抗菌效果最好的。抗生素对试验用金黄色葡萄球菌的抑制活性总体上要好于抗菌肽。与抗生素相比 ,cecropin A、cecropin P1和 indolicidin对猪霍乱沙门氏菌和鼠伤寒沙门氏菌具有更好的抗菌效果。另外 ,抗菌肽的抑菌圈边缘十分清晰 ,而抗生素的整个抑菌圈都比较模糊且界线不明。因此 ,从抗菌效果方面考虑 ,抗菌肽可以代替抗生素用于疾病的预防和治疗 相似文献