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Morphological conversion from spiralto coccoid forms occurred when HP was cultured with selenium and most of coccoid forms had fragmentary flagella and pilus; the effection of selenium to activity of urease, catalase, alkaline phosphatase is not exist or not evidence; selenium enable pET32a-vacA-E.coli BL21 which can express VacA produce yellow lipochrome, and the color become deeper with increasing of concentration of selenium; selenium can decrease expression of recombined VacA by restrain the growth of pET32a-vacA-E.coli,but can not influence activity and gene sequence of VacA; selenium can enhance the suppression effect of recombined VacA for gastric cancer cell, depress the index of cell multiplication and the forming rate of colony, decrease the number of cell in S period, increase total of cell in G period; After purified, the recombined VacA can be identified by VacA antibody.
体外实验结果表明:一定浓度的硒作用HP后,HP菌落数量随着硒浓度的增加而减少,菌落颜色由灰白色变为砖红色,溶血现象随硒浓度的增加和作用时间的延长而逐渐消失,HP的形态由弯曲形变为球形或椭圆形,鞭毛及菌毛出现脱落现象;硒对尿素酶、过氧化氢酶、碱性磷酸酶活性无影响或影响不明显;一定浓度的硒能使表达VacA的pET32a-vacA-E.coli BL21工程菌产生脂溶性砖红色色素,颜色随硒浓度增加而加深;一定浓度的硒通过抑制pET32a-vacA-E.coli BL21工程菌的生长,减少重组VacA表达量,但不影响其空泡毒活性及编码基因序列;纯化后的VacA重组蛋白可被VacA抗体识别,具有良好的抗原性。
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We also discovered that selenium can decrease hematolysis and effects function of vacuole toxin of HP. morphological conversion from spiralto coccoid forms occurredwhen HP was caltured with selenium and most of coccoid forms had fragmentary flagella and pilus; the effection of selenium to activity of urease, catalase, alkaline phosphatase is not exist or not evidence; selenium enable pET32a-vacA-E. coli BL21 which can express VacA produce yellow lipochrome, and the color become deeper with increasing of concentration of selenium; selenium can decrease expression of recombined VacA by restrain the growth of pET32a-vacA-E. coli, but can not influence activity and gene equence of VacA; selenium can enhance the suppression effect of recombined VacA for gastric cancer cell, depress the index of cell multiplication and the forming rate of colony, decrease the number of cell in S period, increase total of cell in G period; After purified, the recombined VacA can be identified by VacA antibody.
结果:体外实验结果表明:一定浓度的硒作用HP后,HP菌落数量随着硒浓度的增加而减少,菌落颜色由灰白色变为砖红色,溶血现象随硒浓度的增加和作用时间的延长而逐渐消失,HP的形态由弯曲形变为球形或椭圆形,鞭毛及菌毛出现脱落现象;硒对尿素酶、过氧化氢酶、碱性磷酸酶活性无影响或影响不明显;一定浓度的硒能使表达VacA的pET32a-vacA-E.coli BL21工程菌产生脂溶性砖红色色素,颜色随硒浓度增加而加深;一定浓度的硒通过抑制pET32a-vacA-E.coli BL21工程菌的生长,减少重组VacA表达量,但不影响其空泡毒活性及编码基因序列;硒能增强重组VacA对胃癌细胞的抑制作用,使细胞分裂指数和集落形成率降低、S期细胞数量减少,G1期细胞总数增加;纯化后的VacA重组蛋白可被VacA抗体识别,具有良好的抗原性。
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The results showed that the Saccharopolyspora spinosa SP06081 protoplast yield was the highest under these conditions: the collected mycelium from SP06081 grown in Tryptic Soy Broth medium with 0.2% glycin for 48 h was treated by 0.1 mg/mL lysozyme at 28oC for 20 min, then plated on the R2YE medium with sucrose as osmotic stabilizer, the number of regeneration protoplast was up to 108/mL. The protoplast-regenerated strains exhibited changes in morphology and antibiotic production, 29.3% protoplast-regenerated strains was characterized by loose mycelium and abundant broken branches as did their parent. Among them, 58.2% strains presented the trend to positive variation in spinosad yield, with the highest spinosad yield of up to 582.0 mg/L, 85.6% higher than that of their parent.
结果表明:菌体在添加0.2%的甘氨酸的TSB培养基中培养48 h收集, 0.1 mg/mL 溶菌酶, 28oC作用20 min制备原生质体,将原生质体涂布于以蔗糖为渗透压稳定剂的R2YE培养基中,原生质体再生数目最多,达108个/mL以上;原生质体再生菌株在形态和抗生素产量上产生分化, 29.3%的再生菌株形态上保持与亲本菌株一致,具有菌丝松散,断裂分枝多的特点,其中53.2%的再生菌株多杀菌素产量变异向正方向移动,最高产量达到582.0 mg/L,比亲本菌株提高85.6%。
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In macrophages, Legionella destructed the transmission of small bubble, prevented phagosome-lysosome fusion, prevented the meaning of the sterilization of endosome and lysosome, established its own unique copy of the body and swallowed up full of host cells, finally leaded to the host cell death.
在巨噬细胞内,军团菌破坏小泡传输,产生空泡,阻止吞噬体-溶酶体融合,阻止内涵体和溶酶体的杀菌作用,建立其独占的复制型吞噬体,以二***复制,产生大量的吞噬体,布满宿主细胞,导致宿主细胞死亡。
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A bacteriocin-like substance producing strain T12 was screened from 212 lactic acid bacteria isolated from intestine of healthy pigs by paper disk test and was identified as Lactobacillus. The supernatant of T12 exhibited strong inhibitory activity against the gram-positive bacteria, including Micrococcus lysodeikticus, Staphylococcus aureus, Bacillus subtilis and Bacillus cereus. A strong activity was also observed against the gram–negative bacteria and some eumycete, such as Escherichia coli, Salmonella typhimurium and Fusarium graminearum.
通过滤纸片法从健康肉猪猪大肠、小肠中分离得到212株抗生物质产生菌,以杯碟法复筛,得到1株对溶壁微球菌、金黄色葡萄球菌、枯草芽孢杆菌、蜡状芽孢杆菌等革兰氏阳性菌和大肠杆菌、鼠伤寒沙门氏菌等革兰氏阴性菌以及部分真菌如禾谷镰刀霉均有强烈抑制作用的乳酸菌。
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Streptomyces strain 24# was isolated from our lab to produce secondary metabolites which could strongly antibiotic to 30 plant pathogenic fungi, such as Helminthosporium sorokinum, fusarium graminearum Schw., Valsa mali, etc.
本实验室通过对一株产生抗真菌活性物质的链霉菌24#抗菌谱的测定,发现其对30余种植物病原真菌有显著拮抗作用,其次生代谢产物对病菌菌丝有断裂、溶壁、缢缩等致畸效应。
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Phenylmethylsulfonyl fluoride (174.2 mg/mL), chicken ovomucoid (1000 mg/mL) and soy-bean trypsin inhibitor (1000 mg/mL) could inhibit enzyme activity, which indicated that the enzyme belonged to serine protease group. On plasminogen-free fibrin plates and plasminogen fibrin plates, the fibrinolytic activity had no obvious difference, indicating that the enzyme was a fibrinolytic enzyme which degraded fibrin directly, but not a plasminogen activator which degraded fibrin by activating plasminogen.
此菌株产生的纤溶酶在50℃以下和pH5.0~11.0范围内具有较好的稳定性,最适作用温度为42℃;最适pH值为9.0;Mg2+、Ca2+对此酶有明显的激活作用,而Cu2+能完全抑制酶的活性;174.2 mg/mL的苯甲基磺酰氟、1000 mg/mL的鸡卵类粘蛋白和1000 mg/mL大豆胰蛋白酶抑制剂能完全抑制酶活性,初步说明此酶属于丝氨酸蛋白酶类;体外溶纤作用表明,该酶溶解纤维蛋白的方式是直接溶解,而不是通过激活纤溶酶原。
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Two outstanding fusants SR-7 and SR-T19 were chose out in the fusion group 90-11×FR-008, the former produces not only antibiotics the parents produced but also a new antibiotic effective gainst a wide range of both gram positive and negative bacteria, which the parents could not produce, and its product of the 37℃ fermentation was very effective against the cotton seedling damping off caused by Rhizoctonia sonali while product of the 26℃ was effective agaist the bacterial rots of turnip and Chinese cabbage; the latter have a much stronger activity against a wide range of fungi and yeasts than the parents.
在90-11×FR-008融合组合中,筛选获得2个优良融合子SR-7和SR-T19,前者除产生亲本产生的抗生素外,还产生亲本不产生的一种新的具有广谱抗细菌活性的碱性水溶性抗生素,防病试验表明,其37℃发酵产物对棉花苗期立枯病具有良好的防治效果,28℃发酵产物对萝卜和大白菜具有明显的防腐作用;后者与亲本FR-008的抗菌谱完全一致,但其活性强度都超过了FR-008;采用RAPD分子标记技术检测了SR-7和SR-T19与亲本的同源性及彼此间的差异,从而首次直接从DNA分子水平上验证了链霉菌的原生质体融合子及其遗传重组的多样性。