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HEPES buffer pH 7.4

Company: Sigma-Aldrich
Catalog#: F7876
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Preparation and Characterization of Ginger Lipid-derived Nanoparticles for Colon-targeted siRNA Delivery
Author:
Date:
2020-07-20
[Abstract]  Synthetic nanoparticle-based drug delivery system is widely known for its ability to increase the efficacy and specificity of loaded drugs, but it often suffers from relatively higher immunotoxicity and higher costs as compared to traditional drug formulations. Contrarily, plant-derived nanoparticles appear to be free from these limitations of synthetic nanoparticles; they are naturally occurring biocompatible vesicles that do not generate immunotoxicity and are easy to obtain. Additionally, lipids isolated from plant-derived nanoparticles have shown the capability of assembling themselves to spherical nano-sized liposomal particles. Herein, we employ lipids extracted from ginger-derived nanoparticles and load them with therapeutic siRNA (CD98-siRNA) to create CD98-siRNA/ginger-lipid ... [摘要]  [摘要 ]基于合成纳米颗粒的药物递送系统以其增加所载药物的功效和特异性的能力而广为人知,但是与传统药物制剂相比,它经常遭受相对较高的免疫毒性和较高的成本。相反,植物来源的纳米粒子似乎不受合成纳米粒子的这些限制;它们是天然存在的生物相容性囊泡,不会产生免疫毒性并且易于获得。另外,从植物来源的纳米颗粒分离的脂质已显示出将其自身组装成球形纳米尺寸脂质体颗粒的能力。在本文中,我们采用从生姜纳米颗粒中提取的脂质,并用治疗性siRNA(CD98-siRNA)加载脂质,以创建CD98-siRNA /生姜脂质纳米颗粒。CD98-siRNA /姜脂脂质纳米颗粒的表征显示它们呈球形,直径约为189.5 nm。纳米颗粒的表面ζ电势在-18.1至-18.4mV之间变化。此外,在最近的研究中,CD98-siRNA /姜脂纳米颗粒在右旋糖酐硫酸钠(DSS)诱发的结肠炎小鼠模型中显示出特定的结肠靶向能力和出色的抗炎功效。

[背景 ] 小干扰RNA(siRN As)是一种有前途的治疗剂,可以通过沉默异常上调的信使RNA(mRNA)来治疗各种疾病(Nikam and Gore ,2018)。尽管siRNA的有效性,安全有效地将siRNA递送至治疗靶标仍然是一项艰巨的任务(Tatiparti et al ...

Conjugation Protocol Optimised for Roseburia inulinivorans and Eubacterium rectale
Author:
Date:
2020-04-05
[Abstract]  Roseburia and Eubacterium species of the human gut microbiota play an important role in the maintaince of human health, partly by producing butyrate, the main energy source of our colonic epithelial cells. However, our knowledge of the biochemistry and physiology of these bacteria has been limited by a lack of genetic manipulation techniques. Conjugative transposons previously introduced into Roseburia species could not be easily modified, greatly limiting their applicability as genetic modification platforms. Modular plasmid shuttle vectors have previously been developed for Clostridium species, which share a taxonomic order with Roseburia and Eubacterium, raising the possibility that these vectors could be used in these organisms. ... [摘要]  [摘要 ] 人体肠道菌群中的玫瑰菌属和真细菌属在维持人类健康中起着重要作用,部分原因是产生丁酸盐,这是我们结肠上皮细胞的主要能源。但是,由于缺乏基因操作技术,我们对这些细菌的生物化学和生理学的认识受到限制。先前引入玫瑰花属物种的共轭转座子不容易被修饰,极大地限制了它们作为基因修饰平台的适用性。MOD ular质粒穿梭载体先前已经开发了用于梭菌物种,其与共享一个分类次序ř oseburia 和真杆菌,提高这些矢量可以在这些生物体中使用的可能性。在这里,我们描述了一种优化缀合协议使得能够自主复制的质粒的从转印大肠杆菌供体菌株为罗斯氏inulinivorans 和真杆菌rectale 。质粒的模块性质及其通过自主复制在受体细菌中得以维持的能力使其成为研究异源基因表达的理想之选,并成为其他遗传工具(包括反义RNA沉默或II 型移动子中断子基因破坏策略)的平台。

[背景 ] 玫瑰菌和真细菌属人类肠道菌群中含量最高的细菌(Zhernakova 等,2016),它们通过利用饮食和宿主衍生的多糖影响人类健康(Scott 等,2006和2011; Cockburn 等) 。,2015 ; 谢里登等人,2016 )并产生促进健康的代谢物丁酸作为发酵终产物(邓肯等人,2002和2006) 。另外,这些物种能够通过鞭毛调节宿主免疫(Neville ...

Soluble and Solid Iron Reduction Assays with Desulfitobacterium hafniense
Author:
Date:
2018-09-05
[Abstract]  There is a pressing need to develop sustainable and efficient methods to protect and stabilize iron objects. To develop a conservation-restoration method for corroded iron objects, this bio-protocol presents the steps to investigate reductive dissolution of ferric iron and biogenic production of stabilizing ferrous iron minerals in the strict anaerobe Desulfitobacterium hafniense (strains TCE1 and LBE). We investigated iron reduction using three different Fe(III) sources: Fe(III)-citrate (a soluble phase), akaganeite (solid iron phase), and corroded coupons. This protocol describes a method that combines spectrophotometric quantification of the complex Fe(II)-Ferrozine® with mineral characterization by scanning electron microscopy and Raman spectroscopy. These three ... [摘要]  迫切需要开发可持续和有效的方法来保护和稳定铁制物体。为了开发腐蚀铁物体的保护 - 恢复方法,该生物方案提出了研究严格厌氧菌[Desulfitobacterium hafniense (菌株TCE1)中三价铁的还原溶解和稳定亚铁矿物质的生物产生的步骤。和LBE)。我们使用三种不同的Fe(III)来源研究了铁还原:Fe(III) - 柠檬酸盐(可溶相),akaganeite(固体铁相)和腐蚀的试样。该协议描述了一种方法,该方法结合了复杂的Fe(II)-Ferrozine ®的分光光度定量,通过扫描电子显微镜和拉曼光谱进行矿物表征。这三种方法可以评估三价铁的还原溶解和生物矿物质生产,作为开发一种创新的可持续方法来稳定腐蚀铁的有希望的替代方法。

【背景】自铁器时代以来,铁已被用于生产日常用具。因此,考古学上的铁试验是过去极其重要的证据,应予以保留。然而,由于其反应性,铁容易被腐蚀并且考古铁物体可能被完全损坏。埋藏时,铁制品会根据埋葬地点的环境条件形成复杂的腐蚀层。挖掘后,条件发生变化,腐蚀层变得不稳定。为避免完全破坏,考古铁制物需要快速稳定处理。目前,可用的稳定化处理不能提供长期保护并且具有实质性缺点,例如毒性,低效率和大量废物的产生(Scott和Eggert,2009; Rimmer 等人, 2012)。因此,有必要开发新技术来稳定考古铁器。

越来越多地考虑利用微生物代谢来开发更有效,可持续和环保的保护 ...

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