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公司名称: VWR
产品编号: 28245.298
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Bacterial Cell Wall Precursor Phosphatase Assays Using Thin-layer Chromatography (TLC) and High Pressure Liquid Chromatography (HPLC)
Author:
Date:
2018-03-20
[Abstract]  Peptidoglycan encases the bacterial cytoplasmic membrane to protect the cell from lysis due to the turgor. The final steps of peptidoglycan synthesis require a membrane-anchored substrate called lipid II, in which the peptidoglycan subunit is linked to the carrier lipid undecaprenol via a pyrophosphate moiety. Lipid II is the target of glycopeptide antibiotics and several antimicrobial peptides, and is degraded by ‘attacking’ enzymes involved in bacterial competition to induce lysis. Here we describe two protocols using thin-layer chromatography (TLC) and high pressure liquid chromatography ... [摘要]  肽聚糖包裹细菌细胞质膜以保护细胞免于因膨胀而导致的溶解。 肽聚糖合成的最后步骤需要称为脂质II的膜锚定底物,其中肽聚糖亚基通过焦磷酸部分连接至载体脂质十一碳烯醇。 脂质II是糖肽抗生素和几种抗微生物肽的靶标,并且通过参与细菌竞争的“攻击”酶来降解以诱导裂解。 在这里,我们分别描述了两种使用薄层色谱法(TLC)和高压液相色谱法(HPLC)的方案来测定磷脂酶如Colicin M或来自中间链球菌的LXG毒素蛋白TelC对脂质II的消化,的。 TLC方法也可以监测十一异戊二烯基(pyro)磷酸盐的消化,而HPLC方法允许分离脂质II的二 - ,单 - 或非磷酸化二糖五肽产物。

【背景】肽聚糖(PG)球囊是一种必需的细菌大分子,它可以保护细胞免受由于其膨胀引起的破裂并保持细胞的形状(Vollmer和Bertsche,2008; Typas等人,2012)。 PG由通过短肽连接的聚糖链组成。来自不同物种的PG在肽的结构和二级修饰的存在方面有所不同(Vollmer等人,2008)。 ...

In situ Hybridization (ISH) in Preparasitic and Parasitic Stages of the Plant-parasitic Nematode Meloidogyne spp.
Author:
Date:
2018-03-20
[Abstract]  The spatio-temporal expression pattern of a gene provides important indications to better understand its biological function. In situ hybridization (ISH) uses a labeled complementary single-stranded RNA or DNA probe to localize gene transcripts in a whole organism, a whole organ or a section of tissue. We adapted the ISH technique to the plant parasite Meloidogyne spp. (root-knot nematode) to visualize RNAs both in free-living preparasitic juveniles and in parasitic stages settled in the plant tissues. We describe each step of the probe synthesis, digoxigenin (DIG) labeling, ... [摘要]  基因的时空表达模式为更好地理解其生物学功能提供了重要的指示。 原位杂交(ISH)使用标记的互补单链RNA或DNA探针来定位整个生物体,整个器官或一部分组织中的基因转录物。 我们将ISH技术应用于植物寄生虫

【背景】到目前为止,植物寄生性线虫的稳定转化尚未成功。 ISH能够在整个装载的Meloidogyne spp中分析体内时空基因表达。线虫。这些根结线虫在土壤中以微小蚓状幼虫(J2)形式孵化并感染宿主植物根部。 J2s穿透根部并迁移到根部维管柱状细胞。幼虫定居在根部,发育成J3和J4寄生幼鱼,诱导分化专化饲养细胞。线虫最终发育成梨形雌性,将在根表面释放数百个卵。在这里,我们报告了一个详细的协议来检测准备性整体安装J2s和寄生阶段中的单个RNA分子。寄生虫阶段的ISH需要在感染根部提取线虫前一天采取额外的程序。我们描述了在线虫整个组织中使用地高辛(DIG)标记的cDNA探针检测转录物。

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