Growth of non-phototrophic microorganisms using solar energy through mineral photocatalysis
Growth of non-phototrophic microorganisms using solar energy through mineral photocatalysis
复制标题
通过矿物光催化利用太阳能生长非光养微生物
DOI：
10.1038/ncomms1768
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发表时间：
2012-04-01
影响因子：
16.6
通讯作者：
Dong, Hailiang
中科院分区：
文献类型：
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作者：
Lu, Anhuai;Li, Yan;Dong, Hailiang
光养和化养是微生物代谢的两种主要方式。迄今为止，非光养微生物已被排除在太阳光为中心的光合代谢。在这里，我们报告了一个途径，证明了光在非光养微生物活动的作用。在实验室模拟中，来自金属氧化物、金属硫化物和氧化铁的可见光激发的光电子刺激了化能自养和异养细菌的生长。测得的细菌生长依赖于光的波长和强度，生长模式与矿物的光吸收光谱相匹配。光-生物质转化效率在0.13-1.90‰之间。在含有细菌和半导体矿物质的天然土壤样品中也得到了类似的观察结果。这项研究的结果为一种新发现的，但可能长期存在的途径提供了证据，在这种途径中，非光养细菌的代谢和生长可以通过半导体矿物质的分解被太阳光刺激。
Phototrophy and chemotrophy are two dominant modes of microbial metabolism. To date, non-phototrophic microorganisms have been excluded from the solar light-centered phototrophic metabolism. Here we report a pathway that demonstrates a role of light in non-phototrophic microbial activity. In lab simulations, visible light-excited photoelectrons from metal oxide, metal sulfide, and iron oxide stimulated the growth of chemoautotrophic and heterotrophic bacteria. The measured bacterial growth was dependent on light wavelength and intensity, and the growth pattern matched the light absorption spectra of the minerals. The photon-to-biomass conversion efficiency was in the range of 0.13–1.90‰. Similar observations were obtained in a natural soil sample containing both bacteria and semiconducting minerals. Results from this study provide evidence for a newly identified, but possibly long-existing pathway, in which the metabolisms and growth of non-phototrophic bacteria can be stimulated by solar light through photocatalysis of semiconducting minerals.