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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >An integrated approach for determining the origin of magnetite nanoparticles
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An integrated approach for determining the origin of magnetite nanoparticles

机译：确定磁铁矿纳米颗粒起源的综合方法

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The criteria to assess the origin of magnetite are of prime importance because of their significance as biomarkers for extraterrestrial life and paleoenvironmental indicators. It is still unclear if morphology and magnetic properties of crystals do quantitatively allow differentiating abiotic from biotic magnetite crystals of nanometer size. In this study, inorganic magnetite nanocrystals synthesized under controlled experimental aqueous conditions are compared with biogenic magnetite of similar size and morphology formed by magnetotactic (intracellular magnetite) and other (extracellular magnetite) bacteria. Structural properties such as oxygen isotope fractionations and crystal size distributions were explored. Not surprisingly, none of the single properties are able to differentiate inorganic crystals from those having a bacterial origin, either specifically extracellular or specifically intracellular. However, oxygen isotope fractionation allows the differentiation between abiotic and biotic magnetite when the temperature of formation is known and when it does not fall into a crossing region (35 <= T (degrees C) <= 55) while crystal size distributions discriminate inorganic from intracellular magnetite. Therefore, a combination of these two properties may be a successful tool for an accurate determination of a reliable biogenicity criterion. (c) 2006 Elsevier B.V All rights reserved.
机译：评估磁铁矿成因的标准极为重要，因为它们作为地外生命和古环境指标的生物标记物具有重要意义。尚不清楚晶体的形态和磁性是否能够定量地使非生物与纳米尺寸的生物磁铁矿晶体区分开。在这项研究中，将在受控实验水性条件下合成的无机磁铁矿纳米晶体与由趋磁（细胞内磁铁矿）和其他（细胞外磁铁矿）细菌形成的相似大小和形态的生物磁铁矿进行了比较。探索了诸如氧同位素分级分离和晶体尺寸分布的结构特性。毫不奇怪，这些单一特性都无法将无机晶体与具有细菌起源的晶体区分开，无论是细胞外还是细胞内。但是，当形成的温度已知并且当它不属于交叉区域（35 <= T（摄氏度）<= 55）时，氧同位素分级分离可以区分非生物磁铁矿和生物磁铁矿，而晶体大小分布则可以将无机矿物与细胞内磁铁矿。因此，这两个属性的组合可能是成功确定可靠生物成因标准的成功工具。 （c）2006 Elsevier B.V保留所有权利。

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