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首页> 外文期刊>Environment and Ecology Research >Autotrophic Growth of Paracoccus denitrificans in Aerobic Condition and the Accumulation of Biodegradable Plastics from CO2
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Autotrophic Growth of Paracoccus denitrificans in Aerobic Condition and the Accumulation of Biodegradable Plastics from CO2

机译：有氧条件下反硝化副球菌的自养生长和CO 2 中可降解塑料的积累

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摘要

The cell growth on H2 and O2 as the energy source and CO2 as the sole carbon source in the autotrophic culture condition was tested for the gram-negative bacteria Paracoccus spp. The aerobic growth in the autotrophic condition was only observed in Paracoccus denitrificans NBRC13301 and P.pantotrophus NBRC102493. Both strains were sensitive to O2 in particular the growth of P.pantotrophus was completely inhibited at the concentrations above 2% O2. P.denitrificans grew until 15% O2 however the optimum O2 concentration was 5%. The growth characteristic of P.denitrificans was investigated by pH-controlled batch culture with supplying the gas mixture of H2, O2 and CO2. The specific growth rate was 0.12 h-1 at 5% O2, 30℃ and pH7.0. The growth was much slower than other hydrogen-oxidizing bacteria however P.denitrificans accumulated biodegradable plastic, polyhydroxybutyrate, PHB with the content of 57.3% w/w in the cell under nitrogen limitation. Under DO limitation, the cell concentration increased to 25 g/L without accumulating PHB if NH3 solution as the nitrogen source was fed sufficiently.
机译：在自养培养条件下，检测了H 2 和O 2 作为能源以及CO 2 作为唯一碳源的细胞生长情况。革兰氏阴性菌Paracoccus spp。在自养条件下的有氧生长仅在反硝化副球菌NBRC13301和泛营养假单胞菌NBRC102493中观察到。两种菌株都对O 2 敏感，特别是在2％以上的O 2 浓度下，对虾的生长均被完全抑制。 P.denitrificans一直生长到15％O 2 ，但最佳O 2 浓度为5％。通过控制pH的分批培养并供应H 2 ，O 2 和CO 2 。在5％O 2 ，30℃和pH7.0下，比生长速率为0.12 h -1 。生长比其他氢氧化细菌要慢得多，但是在氮限制下，P.denitrificans会在细胞中积累可生物降解的塑料，聚羟基丁酸酯，PHB，含量为57.3％w / w。在溶解氧的限制下，如果以NH 3 溶液作为氮源，则细胞浓度可以增加到25 g / L，而不会积累PHB。

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