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Iron(III) citrate tribasic monohydrate

柠檬酸三水合一水合物

Company: Sigma-Aldrich
Catalog#: 44941
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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 ...

Measuring Auxin Transport Capacity in Seedling Roots of Medicago truncatula
Author:
Date:
2016-06-20
[Abstract]  Measurement of auxin transport capacity provides quantitative data on the physiological machinery involved in auxin transport within plants. This technique is easy to perform and gives quick results. Radiolabelled auxin (indole-3-acetic-acid) is fed into the roots of Medicago truncatula via an agar block. The resulting radioactivity from radiolabelled auxin uptake in the roots is measured with a liquid scintillation counter. Here, we describe the measurement of auxin transport capacity around the nodulation susceptible zone in young seedling roots of M. truncatula in response to rhizobia inoculation. Similar assays could be adapted in other plant species and to answer other biological questions. [摘要]  生长素运输能力的测量提供了涉及植物中生长素运输的生理机制的定量数据。 这种技术很容易执行,并给出快速的结果。 将放射性标记的生长素(吲哚-3-乙酸)通过琼脂块加入到Medic藜苜蓿的根部。 使用液体闪烁计数器测量根中放射性标记的生长素摄取的最终放射性。 在这里,我们描述了生长素运输能力周围的结瘤敏感区在年轻幼苗根的测量。 truncatula 响应根瘤菌接种。 类似的测定可以适用于其他植物物种并回答其他生物学问题。

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