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Sodium carbonate

碳酸钠

公司名称: Sigma-Aldrich
产品编号: S2127
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Quantification of Chitinase Activity in Fusarium oxysporum
Author:
Date:
2016-08-05
[Abstract]  Fungal morphogenetic development requires modification and plasticity of the cell wall, which implies synthesis and remodelling of its components, including chitin and glucan. Thus chitinase and glucanase activities are crucial for cell-wall biogenesis and cell division. Quantification of chitinase activity might be useful to identify structural defects that could negatively influence growth and morphogenesis of some filamentous fungi like Fusarium oxysporum, which produces both intracellular and secreted chitinases. The chitinolytic enzymes are categorized based on their enzymatic ... [摘要]  真菌形态发生需要细胞壁的修饰和可塑性,这意味着其组分(包括壳多糖和葡聚糖)的合成和重塑。因此几丁质酶和葡聚糖酶活性对于细胞壁生物发生和细胞分裂是至关重要的。几丁质酶活性的定量可能有助于鉴定可能负面影响一些丝状真菌如产生细胞内和分泌型几丁质酶的尖孢镰刀菌的生长和形态发生的结构缺陷。基于它们对壳多糖底物的酶作用将壳聚糖分解酶分类。内酯酶被定义为催化几丁质链中内部点的随机裂解的酶。外切球蛋白酶催化乙酰壳寡糖或N-乙酰葡糖胺从几丁质的非还原端逐步释放,因此分别称为壳聚糖酶和β-N-乙酰氨基葡糖苷酶。在这里,我们描述了一种简单的方法来轻易地纯化几丁质酶,以便比较不同的F的内切几丁质酶活性和外切几丁质酶活性。尖孢镰孢菌株。该方案可适用于任何真菌物种。

Determination of Intra- and Extracellular Glucose in Mycelium of Fusarium oxysporum
Author:
Date:
2016-07-20
[Abstract]  To study alterations in the metabolism and/or in the transport of glucose during Fusarium oxysporum vegetative growth, we determined intracellular glucose levels in different fungal strains, as well as the amount of glucose remaining in the supernatants after growth in synthetic medium (SM) supplemented with either 0.05 or 2.5% glucose. We used the Glucose (GO) Assay Kit (Sigma-Aldrich) following the instructions of the manufacturer with some modifications. The protocol described here can be applied to other filamentous fungi. [摘要]  为了研究尖镰孢营养生长期间葡萄糖的代谢和/或转运中的改变,我们测定了不同真菌菌株中的细胞内葡萄糖水平以及生长后上清液中剩余的葡萄糖量 在补充有0.05或2.5%葡萄糖的合成培养基(SM)中。 我们使用葡萄糖(GO)测定试剂盒(Sigma-Aldrich)按照制造商的指示进行一些修改。 这里描述的协议可以应用于其他丝状真菌。

Pectin Nanostructure Visualization by Atomic Force Microscopy
Author:
Date:
2015-09-20
[Abstract]  Pectins, complex polysaccharides rich in galacturonic acid, are a major component of primary plant cell walls. These macromolecules regulate cell wall porosity and intercellular adhesion, being important in the control of cell expansion and differentiation through their effect on the rheological properties of the cell wall. In fruits, pectin disassembly during ripening is one the main event leading to textural changes and softening. Changes in pectic polymer size, composition and structure have been studied by conventional techniques, most of them relying on bulk analysis of a population of ... [摘要]  果胶,富含半乳糖醛酸的复合多糖是主要植物细胞壁的主要成分。这些大分子调节细胞壁孔隙度和细胞间粘附,在通过它们对细胞壁的流变性质的影响来控制细胞扩增和分化中是重要的。在果实中,果胶在成熟期间的拆卸是导致质地变化和软化的主要事件。已经通过常规技术研究了果胶聚合物尺寸,组成和结构的变化,其中大多数依赖于多糖群体的批量分析,但是对分离的聚合物链的详细结构的研究很少(Paniagua等人, >,2014)。原子力显微镜(AFM)是一种通用且强大的技术,能够分析力测量,以及以纳米尺度可视化生物样品的粗糙度(Morris等人,2010)。使用这种技术,最近的研究发现果胶纳米结构复杂性和几种果实的纹理和收获后行为之间的密切关系(Liu和Cheng,2011; Cybulska等人,2014; Pose等。,2015)。在这里,我们描述了AFM程序,以在地形学上可视化来自果实细胞壁提取物的果胶聚合物,其已经成功地用于草莓成熟的研究中(Pose等人,2012; ,2015)。因此,从AFM图像,可以在高放大率和最小的样品制备下分离孤立链(长度,高度和分支模式)的3D结构分析。 AFM基本原理和不同采样模式的完整描述在Morris等人(2010)中描述。

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