图1 带有炭疽细菌的信件（图源自网络）
图2 美国联邦调查局发布的悬赏通知（图源自网络）
这取材自炭疽细菌邮件事件中一个真实的细节：与实验室平常处理的液态炭疽细菌不同，这批邮件中的炭疽孢子粉末是干燥过的，并且可以在空气中四处飘浮。细菌只有能够在空气中形成稳定的气溶胶，才能够在空气中扩散，并被人体吸入。
图3 Scientist admits mistake on anthrax, Los Angeles Times, Sept. 12, 2008（图源自网络）
图4 Bruce Edwards Ivins博士（图源自网络）
枯草芽孢杆菌（SEM照片，上）
图6 硅元素（Si）是地壳中第二丰富的元素（图片修改自网络）
图7 硅藻（电子显微镜下照片）
图8 李金华研究员（左）和硕士研究生张衡（右）在陕西西安未央湖采集湖底沉积物样品
图9 A. WYHC-5的透射电镜照片显示细胞内纳米尺寸的磁小体链和亚微米尺寸的球状颗粒物。B. 单个磁铁矿（Fe3O4）磁小体颗粒的高分辨透射电镜图像。C. WYHC-5细胞内的子弹头形磁小体。
图10 透射电镜技术分析WYHC-5细胞内颗粒物成分和结构。A. 两个代表性WYHC-5细胞的高角环形暗场扫描透射电镜图像（HAADF-STEM）；B. WYHC-5细胞的局部放大图（HAADF-STEM）；C-D. O和Si元素分布的伪彩图（STEM-EDXS elemental maps）。
图11 趋磁球菌WYHC-5细胞沉硅酶的蛋白质分子建模和结构分析
作者简介：何雨旸，博士，中国科学院地质与地球物理研究所 特聘副研究员。从事交叉学科研究，工作涵盖地球化学、量子力学、化学反应动力学、流体力学、非线性力学等。
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李金华*，刘沛余，塔玛夏·阿力玛，张衡，刘延，王建，MenguyNicolas，赵翔，Roberts Andrew P，潘永信, Diverse intracellular inclusion types within magnetotactic bacteria: implications for biogeochemical cycling in aquatic environments, J. Geophys. Res. Biogeosciences, 2021, 126, e2021JG006310.
李金华*，刘沛余，王建，Roberts Andrew P，潘永信, Magnetotaxis as an adaptation to enable bacterial shuttling of microbial sulfur and sulfur cycling across aquatic oxic-anoxic interfaces, J. Geophys. Res. Biogeosciences, 2020, 125(12), e2020JG006012.
李金华*，Menguy Nicolas，Leroy Eric，Roberts Andrew P，刘沛余，潘永信, Biomineralization and magnetism of uncultured magnetotactic coccus strain THC-1 with non-chained magnetosomal magnetite nanoparticles, J. Geophys.Res. Solid Earth, 2020, 125: e2020JB020853.
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刘沛余，刘延，任心宜，张志飞，赵翔，Roberts Andrew P，潘永信，李金华*, A novel magnetotactic Alphaproteobacterium producing intracellular magnetite and amorphous calcium-bearing minerals, Appl.Environ. Microbiol., 2021, 87(23): e01556-21.
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编辑：何雨旸
校对：刘强
标签： do
