共查询到19条相似文献，搜索用时 171 毫秒
1.
在应用鲎血试剂检测肉品及蛋品中的细菌内毒素时,我们为验证内毒素对于动物的致死效能,和鲎血试剂在动物机体内对细菌内毒素的作用是增强还是减弱毒性?进行了如下的试验。 相似文献
2.
采用最大有效稀释法,利用两个生产厂家的鲎试剂对两个生产厂家的肌苷注射液进行细菌内毒素检测,结果表明样品稀释50倍后,使用灵敏度为0.5 EU/mL的鲎试剂,对检查无干扰,可用于检查肌苷注射液的细菌内毒素。 相似文献
3.
鲎是一种栖生于海洋的低等无脊椎动物。鲎素为鲎血液中抗菌肽的总称,研究表明鲎素具有抗菌、抑病毒、检测内毒素等多种作用。鲎素对人胃癌BGC823细胞、人肝癌SMMC7721细胞、人肺腺癌SPCAi细胞、人早幼白血病HL60细胞的增殖都有明显的抑制作用。对鲎素的研究为细菌耐药性、药物残留和抗HIV等医学难题的解决提供了新途径。近年来,由于对鲎资源的过度开发利用,这一资源已濒临灭绝。现在,对鲎资源的保护工作正在展开。 相似文献
4.
鲎试剂可用来检测细菌内毒素或热原，具有操作简便、灵敏度高、特异性强、反应迅速等优点，受到普遍欢迎，应用范围日益广泛，尤其是抢救危急病人，检测、诊断，制药工艺流程中内毒素检测，食品工业、水质污染检测等。因此鲎试剂成为国际上价格昂贵，又十分热门的商品。 1鲎的生活习惯与繁殖 鲎生活在温暖的海洋中，冬季需到较深的海域越冬。每当春末夏初，水温上升之际，鲎从深海游向沿岸沙滩。雌雄抱合，在中潮带泥沙中挖穴产卵，受精卵依靠太阳能量孵化，经 5～ 6周时间，幼虫出膜，称三叶幼虫，雌鲎一生中要蜕皮 18次，雄鲎 19次，大约 … 相似文献
5.
以广东省3家种鹅场(代号为A、B、C)为对象,检测了洗浴池和鹅血浆的内毒素水平,并比较和分析了各场种鹅的产蛋数、受精率和活胚率.结果显示:A场和B场洗浴池的内毒素水平无显著差异,均显著高于C场(P<0.05);A场的鹅血浆内毒素水平与B场无显著差异,显著高于C场,而B场与C场则无显著差异.此外,试验期间3家鹅场的鹅产蛋数相当;A场的鹅蛋受精率显著高于B场、但明显低于C场,C场则极显著高于B场(P<0.01);A场活胚率极显著低于B场,显著低于C场,B场则显著高于C场.表明洗浴池内毒素含量高的鹅场,其种鹅体内内毒素水平也相对较高,鹅蛋受精率和胚胎成活率偏低,影响种鹅生产水平. 相似文献
6.
探讨经过紫外线诱变能否筛选出抗鲎素的大肠杆菌突变菌株以及突变菌株对抗生素敏感性的变化.以大肠杆菌JM109和ATCC25922为研究对象,通过紫外线诱变技术对出发菌株进行诱变,以相应的出发菌株作对照,并通过鲎素浓度梯度平板法对大肠杆菌进行初筛后,对初筛到的抗鲎素菌株进行亚抑菌浓度鲎素的连续传代诱导和抗生素对初筛到的抗鲎素菌株进行敏感性测定.结果表明,采用紫外诱变和鲎素浓度梯度筛选的方法,从中筛选到低抗鲎素的大肠杆菌ATCC25922 3株;通过抗生素对此3种低抗鲎素菌株进行敏感性测定,表明抗鲎素菌株对苄星青霉素有显著抗药性,而对盐酸左氧氟沙星仍然敏感.对于大肠杆菌JM109菌株,经过紫外线诱变后,未诱导出抗鲎素菌株. 相似文献
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8.
采用肉汤微量稀释法和MTT法分别测定了鲎素对基因工程菌大肠杆菌BL21、枯草芽孢杆菌WB800、枯草芽孢杆菌BS168、酵母菌GS115、里氏木霉QM9414的MIC(最小抑菌浓度)及其MBC(最小杀菌浓度)值.结果表明,其MIC值分别为10、10、10、20、40 μg/mL,MBC值分别为20、20、20、40、80μg/mL.鲎素对上述5种常见基因工程菌均有不同程度的抑杀作用,考虑到鲎素基因表达量低甚至不表达,很可能是由于鲎素对宿主的抑杀作用,相比于其他基因工程菌,认为丝状真菌里氏木霉QM9414作为鲎素的表达宿主有比较大的潜能. 相似文献
9.
将猪亚利桑那菌培养后离心、冷冻,以小白鼠为试验动物进行细菌毒素鉴定,结果确定猪亚利桑那菌仅有内毒素;用鲎试剂测得其细菌内毒素含量大约为0.125 EU/mL。取10只健康小白鼠观察猪亚利桑那菌对动物的致病性。小白鼠临床症状明显,眼内有脓性分泌物;病理组织切片结果发现,肝细胞界限不清,胞核大小差异较大;脾脏内有大面积出血区;肾小管上皮细胞肿胀,部分胞核消失;心肌纤维肿胀、断裂;由此可见猪亚利桑那菌对小白鼠有很强的致病性。 相似文献
10.
目的观察异丙酚对失血性休克大鼠小肠黏膜屏障功能的影响。方法 36只雄性SD大鼠随机分为对照组和异丙酚组,制作失血性休克模型,经股静脉回输等量林格氏液,异丙酚组加用异丙酚5 mg/kg。18 h后处死大鼠,鲎试＋验测定血浆内毒素含量,免疫组化法检测小肠黏膜固有层IgA细胞,TUNEL法检测小肠黏膜细胞凋亡。结果与对照组＋比较,异丙酚组血浆内毒素含量明显减少,小肠黏膜上皮细胞凋亡指数明显降低,而小肠黏膜固有层IgA细胞数显著升高,差异均有统计学意义（P〈0.01）。结论异丙酚可保护失血性休克对大鼠小肠道黏膜屏障功能的损伤,减轻内毒素血症。 相似文献
11.
GALTON M 《Science (New York, N.Y.)》1963,139(3558):923-924
A single intraperitoneal injection of colchicine regularly elicits the generalized Shwartzman phenomenon in the pregnant golden hamster. Non-pregnant hamsters are refractory both to colchicine and endotoxin. The superiority of colchicine, as opposed to foreign endotoxin, in the pregnant subject, may be attributed to the action of native endotoxin which is allowed parenteral access as a result of colchicine-induced injury to the intestinal mucosa. 相似文献
12.
Passive immunization against cachectin/tumor necrosis factor protects mice from lethal effect of endotoxin 总被引：275，自引：0，他引：275
A highly specific polyclonal rabbit antiserum directed against murine cachectin/tumor necrosis factor (TNF) was prepared. When BALB/c mice were passively immunized with the antiserum or with purified immune globulin, they were protected against the lethal effect of the endotoxin lipopolysaccharide produced by Escherichia coli. The prophylactic effect was dose-dependent and was most effective when the antiserum was administered prior to the injection of the endotoxin. Antiserum to cachectin/TNF did not mitigate the febrile response of endotoxin-treated animals, and very high doses of endotoxin could overcome the protective effect. The median lethal dose of endotoxin in mice pretreated with 50 microliters of the specific antiserum was approximately 2.5 times greater the median lethal dose for controls given nonimmune serum. The data suggest that cachectin/TNF is one of the principal mediators of the lethal effect of endotoxin. 相似文献
13.
Lin IH Miller DS Bertics PJ Murphy CJ de Pablo JJ Abbott NL 《Science (New York, N.Y.)》2011,332(6035):1297-1300
The ordering of liquid crystals (LCs) is known to be influenced by surfaces and contaminants. Here, we report that picogram per milliliter concentrations of endotoxin in water trigger ordering transitions in micrometer-size LC droplets. The ordering transitions, which occur at surface concentrations of endotoxin that are less than 10(-5) Langmuir, are not due to adsorbate-induced changes in the interfacial energy of the LC. The sensitivity of the LC to endotoxin was measured to change by six orders of magnitude with the geometry of the LC (droplet versus slab), supporting the hypothesis that interactions of endotoxin with topological defects in the LC mediate the response of the droplets. The LC ordering transitions depend strongly on glycophospholipid structure and provide new designs for responsive soft matter. 相似文献
14.
Shock and tissue injury induced by recombinant human cachectin 总被引：286，自引：0，他引：286
K J Tracey B Beutler S F Lowry J Merryweather S Wolpe I W Milsark R J Hariri T J Fahey A Zentella J D Albert 《Science (New York, N.Y.)》1986,234(4775):470-474
Cachectin (tumor necrosis factor), a protein produced in large quantities by endotoxin-activated macrophages, has been implicated as an important mediator of the lethal effect of endotoxin. Recombinant human cachectin was infused into rats in an effort to determine whether cachectin, by itself, can elicit the derangements of host physiology caused by administration of endotoxin. When administered in quantities similar to those produced endogenously in response to endotoxin, cachectin causes hypotension, metabolic acidosis, hemoconcentration, and death within minutes to hours, as a result of respiratory arrest. Hyperglycemia and hyperkalemia were also observed after infusion. At necropsy, diffuse pulmonary inflammation and hemorrhage were apparent on gross and histopathologic examination, along with ischemic and hemorrhagic lesions of the gastrointestinal tract, and acute renal tubular necrosis. Thus, it appears that a single protein mediator (cachectin) is capable of inducing many of the deleterious effects of endotoxin. 相似文献
15.
An endotoxin produced by Escherichia coli caused a decrease in prolactin concentrations in the plasma of sows when given at low dosages 2 days postpartum. Five to tenfold increases occurred in the plasma cortisol concentrations. Piglet growth, used as an indicator of milk secretion by the sows, was significantly depressed after the endotoxin administration. Some cases of lactation failure in the periparturient sow may thus be due to endotoxins suppressing prolactin concentrations. This appears to be the first report of a bacterial endotoxin having an effect on prolactin in any species. 相似文献
16.
Bacterial endotoxin increases the frequency of miniature excitatory postsynaptic potentials, decreases facilitation, and increases the evoked excitatory postsynaptic potential without changing membrane resistance. These data indicate that endotoxin acts on the presynaptic nerve terminal by increasing the amount of transmitter substance released in response to an applied stimulus. 相似文献
17.
大肠杆菌内毒素诱导奶山羊急性乳房炎试验 总被引：3，自引：0，他引：3
试验研究了大肠杆菌内毒素乳房灌注在奶山羊引起的临床反应。结果表明，大肠杆菌内毒素注入杂种奶山羊乳池内能诱导出典型的急性乳房炎局部症状和全身症状：乳房肿胀，发热疼痛，体温升高，产奶量下降等。超声波图象说明，水肿是急性乳房肿胀的主要原因。随着局部炎症消失，乳腺组织能迅速达到临床上的完全康复。 相似文献
18.
Amyloidosis induced in mice by Escherichia coli endotoxin 总被引：7，自引：0，他引：7
Amyloidosis was produced in mice by repeated subcutaneous injections of 0.5-or 0.005-milligram amounts of Escherichia coli endotoxin. Of the two strains of mice examined, amyloidosis was induced more readily in one than in the other. The ability of endotoxin to induce amyloidosis lends support to the view that stimulation of reticuloendothelial cells leads to amyloid formation. 相似文献