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VISIBLE RANGE CUVETTES, Semi-micro 1.5ml

Company: KARTELL SPA VIA DELLE INDUSTRIE
Catalog#: 1938
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Isolation of Ribosomal Particles from the Unicellular Cyanobacterium Synechocystis sp. PCC 6803
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Date:
2017-03-20
[Abstract]  Isolation of ribosomal particles is an essential step in the study of ribosomal components as well as in the analysis of trans-acting factors that interact with the ribosome to regulate protein synthesis and modulate the expression profile of the cell in response to different environmental conditions. In this protocol, we describe a procedure for the isolation of 70S ribosomes from the unicellular cyanobacterium Synechocystis sp. PCC 6803 (hereafter Synechocystis). We have successfully used this protocol in our study of the cyanobacterial ribosomal-associated protein LrtA, which is a homologue of bacterial HPF (hibernation promoting factor) (Galmozzi et al., 2016). [摘要]  核糖体颗粒的分离是研究核糖体组分以及与核糖体相互作用以调节蛋白质合成并调节细胞表达谱的反式因子的分析中必不可少的步骤响应不同的环境条件。在本协议中,我们描述了从单细胞蓝细菌集胞藻分离70S核糖体的过程。 PCC 6803(以下简称集胞藻)。我们已经成功地使用这个方案来研究蓝细菌核糖体相关蛋白LrtA,它是细菌HPF(冬眠促进因子)的同系物(Galmozzi等人,2016)。

背景 据报道蓝藻核糖体几乎没有生物化学研究。已经通过差速离心分离70S核糖体颗粒,然后通过二维电泳分析核糖体蛋白质(Sato et al。,et al。 ,1998)。核糖体也已经从聚球藻(Spechococcus)进行制备。 PCC 6301细胞使用组合差速离心和蔗糖步骤梯度的方案(Sugita等人,2000)。通过差速离心分离细胞提取物也被用于制备核糖体样品用于在不同的聚球藻菌株中开发体外翻译系统(Mutsuda和Sugiura,2006 )。基于针对聚球藻(Sugita等人,2000)所述的方法,本文所述的针对集胞藻的方法允许使用以下方式纯化核糖体颗粒线性蔗糖梯度的超速离心。

Quantification of Triphenyl-2H-tetrazoliumchloride Reduction Activity in Bacterial Cells
Author:
Date:
2017-01-20
[Abstract]  This protocol describes the use of the 2,3,5-triphenyl-2H-tetrazolium chloride (TTC) salt to evaluate the cell redox potential of rhizobia cells. The production of brightly colored and insoluble 1,3,5-Triphenyltetrazolium formazan arising from TTC reduction is irreversible and can be easily quantified using a spectrophotometer. This protocol allows the production of reproducible results in a relatively short time for Sinorhizobium meliloti 1021 cells grown both in exponential and stationary phases. The results here presented show that the S. meliloti cells deriving from exponential-phase cultures had increased cell redox potential as compared to the ones deriving from stationary-phase cultures. This means that under exponential growth conditions the S. meliloti ... [摘要]  该方案描述了使用2,3,5-三苯基-2H-四唑氯化物(TTC)盐来评估根瘤细胞的细胞氧化还原电位。由TTC还原产生的鲜色不溶性1,3,5-三苯基四唑甲The的生产是不可逆的,可以使用分光光度计轻松地定量。该方案允许在相对较短的时间内在指数阶段和固定阶段生长的中华根瘤菌中华根瘤菌1021细胞产生可重复的结果。这里提出的结果表明,与来自固定相培养物的细胞相比,从指数阶段培养物得到的猕猴桃细胞具有增加的细胞氧化还原电位。这意味着在指数增长条件下, meliloti 细胞产生更大量的TTC减少所需的还原等同物。

背景 TTC盐是一种水溶性和无色的化合物,可以还原成甲an,高度着色的化合物。甲醛的不可逆形成可以使用分光光度计进行定量。由于其性质和其降低的潜力,该四唑盐广泛用于真核生物和原核生物两者,作为细胞氧化还原活性,活力,药物敏感性和底物利用测定的指标(Byth等人, 2001; Hayashi等人,2003; Raut等人,2008; Lin等人,2008)。由于膜电位,四唑鎓盐的净正电荷有助于细胞摄取,从而允许其细胞内还原(Berridge等人,2005)。在原核生物中,TTC降低的主要研究涉及革兰氏阴性呼吸细菌大肠杆菌,而对Rhizobiacea 家族的成员只有少数研究报道。在这个协议中,这个家族最好的遗传特征成员之一, ...

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