美國(guó)華盛頓大學(xué)等機(jī)構(gòu)研究人員在新一期英國(guó)Nature Communications雜志上發(fā)表報(bào)告說(shuō),，他們發(fā)現(xiàn)一種細(xì)菌可以在有氧氣存在的自然條件下生產(chǎn)氫氣,，有望成為較廉價(jià)的氫氣來(lái)源,。
“藍(lán)藻菌51142”細(xì)菌在有氧環(huán)境可生產(chǎn)氫氣
報(bào)告說(shuō),，這種名為“藍(lán)藻菌51142”的細(xì)菌在白天和夜晚的生理活動(dòng)不同,。在白天有光線的時(shí)候,，它可以進(jìn)行光合作用,，生成氧氣和糖分；而在夜晚,，它會(huì)燃燒白天生成的糖分來(lái)提供能量,，這個(gè)過(guò)程會(huì)耗盡細(xì)胞內(nèi)的氧氣，使得固氮酶可以安全工作,，在有氧環(huán)境中也可生產(chǎn)氫氣,。
通常，固氮酶只要和氧氣接觸就會(huì)被破壞,，因此此前發(fā)現(xiàn)的一些可生產(chǎn)氫氣的微生物都需要在無(wú)氧環(huán)境中工作,，使得產(chǎn)氫成本提高。
研究人員希馬徳里·帕克萊希說(shuō),，他們正計(jì)劃對(duì)這種細(xì)菌進(jìn)行基因改造,，進(jìn)一步提高其產(chǎn)氫量。（生物谷Bioon.com）
生物谷推薦原文出處：
Nature Communications doi:10.1038/ncomms1139
High rates of photobiological H2 production by a cyanobacterium under aerobic conditions
Anindita Bandyopadhyay,Jana St?ckel,Hongtao Min,Louis A. Sherman& Himadri B. Pakrasi
Among the emerging renewable and green energy sources, biohydrogen stands out as an appealing choice. Hydrogen can be produced by certain groups of microorganisms that possess functional nitrogenase and/or bidirectional hydrogenases. In particular, the potential of photobiological hydrogen production by oxygenic photosynthetic microbes has attracted significant interest. However, nitrogenase and hydrogenase are generally oxygen sensitive, and require protective mechanisms to function in an aerobic extracellular environment. Here, we describe Cyanothece sp. ATCC 51142, a unicellular, diazotrophic cyanobacterium with the capacity to generate high levels of hydrogen under aerobic conditions. Wild-type Cyanothece 51142 can produce hydrogen at rates as high as 465?μmol per mg of chlorophyll per hour in the presence of glycerol. Hydrogen production in this strain is mediated by an efficient nitrogenase system, which can be manipulated to convert solar energy into hydrogen at rates that are several fold higher, compared with any previously described wild-type hydrogen-producing photosynthetic microbe.
