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1.5 ml microcentrifuge tubes

Company: Tarson
Catalog#: 500010
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A Quick Method for Screening Biocontrol Efficacy of Bacterial Isolates against Bacterial Wilt Pathogen Ralstonia solanacearum in Tomato
Author:
Date:
2020-11-20
[Abstract]  

Ralstonia solanacearum is a bacterial phytopathogen able to cause bacterial wilt disease in more than 200 plant species. Plant disease biocontrol strategies are used for controlling this disease and tomato is used as a model plant to conduct R. solanacearum associated studies. Conventional screening methods such as seed bacterization, soil drenching and root bacterization (in grown plants) to assess the ability of biocontrol bacteria to antagonize R. solanacearum under in planta conditions in different hosts are time-consuming and costly. A fast, cost effective method is a key requirement to advance the research on R. solanacearum biocontrol. In this protocol, we have inoculated the roots of tomato seedlings with bacterial isolates showing antagonistic activity against R. solanacearum

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[摘要]  [摘要]青枯雷尔氏菌是能够导致青枯病在超过2个细菌植物病原体00植物物种。植物病害生物防治策略用于控制这种疾病和番茄被用来作为模式植物进行青枯菌相关的研究。常规的筛选方法,例如种子杀菌,土壤浸湿和根部杀菌(在生长中的植物中),以评估生物控制细菌在不同宿主中在植物条件下拮抗青枯菌的能力,既耗时又昂贵。一个快速,经济有效的方法是推动研究的关键要求 青枯菌生物防治。在此协议中,我们已在细菌的分离株上接种了番茄幼苗的根,这些分离株在体外条件下显示出对茄青枯菌的拮抗活性。用拮抗细菌处理16小时后,通过成熟的根浸法将青枯菌接种到幼苗中。然后将幼苗保持在受控条件和枯萎/死苗的数目,记录最多10个天交ř 。青枯菌接种。从每个测试的分离物的记录计算生物防治效力。此协议是比在感测已经可用的协议的优点在于,它可以在很短的持续时间内完成(〜18天番茄)并且没有保持苗培养介质的需求。该方法可用于在短时间内以最小的成本快速筛选大量细菌分离株和不同宿主基因型。

[背景[ Ralstonia solanacearum ]是一种土壤传播的细菌性植物病原体,在200多个农作物中引起细菌性枯萎病,代表50个不同的科(Seleim等人,2014),其中大部分来自茄科(Thera等人,2010)。它可以在土壤中壮成长长达数年之久,并具有在寄主到达时感染的能力(Coutinho and ...

Spectrophotometric Assessment of Heme Oxygenase-1 Activity in Leishmania-infected Macrophages
Author:
Date:
2020-04-05
[Abstract]  Heme oxygenase-1 (HO-1) is a stress responsive enzyme that metabolizes heme and releases free iron, carbon monoxide (CO), and biliverdin (BV), which rapidly undergoes conversion to bilirubin (BL). Estimation of bilirubin is the basis of HO-1 assay. HO-1 activity is widely employed to determine antioxidant response of cells under different physiological stress environment. Intra-macrophage infection often acts as such a stress inducer and measurement of HO-1 activity in infected cells indicates the ability of pathogens towards modulating oxidative response of host. The present protocol describes analysis of HO-1 activity in infected macrophages by spectrophotometric method, which is much less complex and therefore advantageous over other methods like high-performance liquid chromatography, ... [摘要]  [摘要] 血红素氧合酶-1 (HO-1)是一种应激反应酶,它能代谢血红素并释放出游离的铁,一氧化碳(CO )和胆绿素(BV),并迅速转变为胆红素(BL)。胆红素的估计是HO-1测定的基础。HO-1活性被广泛用于确定在不同生理压力环境下细胞的抗氧化反应。巨噬细胞内感染通常是压力的诱因和测量方法 被感染细胞中HO-1活性的变化表明病原体具有调节宿主氧化反应的能力。本协议描述了通过分光光度法分析感染的巨噬细胞中HO-1活性的方法,该方法不那么复杂,因此比其他方法(例如高效液相色谱法,放射化学方法和通过气相色谱法检测CO)更具优势。主要步骤包括:(1)制备含有HO-1的巨噬细胞微粒级分(2)分离含有biliverdin还原酶的大鼠肝胞质级分,以及(3)通过分光光度法检测胆红素来评估血红素加氧酶-1活性。该方法提供了一种简单而灵敏的方法来测量感染条件下的细胞抗氧化反应。

[背景] 活性氧(ROS)是抵抗巨噬细胞入侵病原体的主要宿主防御武器之一(Missall 等,2004)。另一方面,巨噬细胞内的病原体由于其在巨噬细胞内的成功持久而中和了早期的氧化爆发(Paiva和Bozza,2014年)。为了应对这种氧化压力,生物可以部署宿主细胞的抗氧化酶,例如超氧化物歧化酶(SOD),过氧化氢酶(CAT)谷胱甘肽过氧化物酶(GPX)和血红素加氧酶-1(HO-1)来清除ROS ...

Microtitre Plate Based Cell-SELEX Method
Author:
Date:
2018-10-20
[Abstract]  Aptamers have emerged as a novel category in the field of bioreceptors due to their wide applications ranging from biosensing to therapeutics. Several variations of their screening process, called SELEX have been reported which can yield sequences with desired properties needed for their final use. We report a facile microtiter plate-based Cell-SELEX method for a gram-negative bacteria E. coli. The optimized protocol allows the reduction of number of rounds for SELEX by offering higher surface area and longer retention times. In addition, this protocol can be modified for other prokaryotic and eukaryotic cells, and glycan moieties as target for generation of high affinity bio-receptors in a short course of time in-vitro. [摘要]  由于适体的广泛应用,从生物传感到治疗,适体已经成为生物受体领域的一个新类别。 已经报道了它们的筛选过程的几种变体,称为SELEX,其可以产生具有最终使用所需的所需性质的序列。 我们报告了一种基于微量滴定板的Cell-SELEX方法,用于革兰氏阴性菌 E.大肠杆菌>。 优化的协议允许通过提供更高的表面积和更长的保留时间来减少SELEX的轮数。 此外,该方案可以针对其他原核和真核细胞进行修饰,并且聚糖部分可以作为在短时间内体外产生高亲和力生物受体的靶标>。

【背景】适体是1990年描述的单链合成DNA或RNA(Ellington和Szostak,1990; Tuerk和Gold,1990),具有独特的3D几何结构,这是其序列的表现。不同的序列允许合成适体,其可以结合从小分子到大蛋白质的分子阵列。这使得适配体成为常规抗体的竞争对手,常规抗体由于结构限制而限于蛋白质作为其靶标,并且不能针对高风险病原体产生,因为这些通常比产生高亲和力所需的时间更早地杀死宿主。抗体。适体在体外>设置中产生,因此可以有效地用于高风险病原体。 SELEX( S L > > > > > > > > >分离导致在低nM范围内具有解离常数的池的筛选。已经提出了SELEX的几种变体,其使用各种固定基质,包括毛细管电泳SELEX,基于亲和层析的SELEX,磁珠SELEX,体内> ...

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