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Multiple and flexible roles of facultative anaerobic bacteria in microaerophilic oleate degradation

机译：微生嗜油性降解中的兼性厌氧细菌的多重和灵活作用

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Anaerobic degradation of long-chain fatty acids (LCFA) involves syntrophic bacteria and methanogens, but facultative anaerobic bacteria (FAB) might have a relevant role as well. Here we investigated oleate degradation by a syntrophic synthetic co-culture ofSyntrophomonas zehnderi(Sz) andMethanobacterium formicicum(Mf) and FAB (two oleate-degradingPseudomonasspp. I1 + I2). Sz + Mf were first cultivated in a continuous bioreactor under strict anaerobic conditions. Thereafter, I1 + I2 were inoculated and microaerophilic conditions were provided. Methane and acetate were the main degradation products by Sz + Mf in anaerobiosis and by Sz + Mf + I1 + I2 in microaerophilic conditions. However, acetate production from oleate was higher in microaerophilic conditions (5% O-2) with the four microorganisms together (0.41 +/- 0.07 mmol day(-1)) than in anaerobiosis with Sz + Mf (0.23 +/- 0.05 mmol day(-1)). Oleate degradation in batch assays was faster by Sz + Mf + I1 + I2 (under microaerophilic conditions) than by Sz + Mf alone (under strict anaerobic conditions). I1 + I2 were able to grow with oleate and with intermediates of oleate degradation (hydrogen, acetate and formate). This work highlights the importance of FAB, particularlyPseudomonassp., in anaerobic reactors treating oleate-based wastewater, because they accelerate oleate conversion to methane, by protecting strict anaerobes from oxygen toxicity and also by acting as alternative hydrogen/formate and acetate scavengers for LCFA-degrading anaerobes.
机译：长链脂肪酸（LCFA）的厌氧降解涉及语言细菌和甲烷，但兼性厌氧菌（Fab）也可能具有相关的作用。在这里，我们通过羟乙二醇（Sz）和Fab（2 oleate-degRadingpseudomonasspp，通过Syntrophomonas ZehnAsi（SZ）和Fab（两个油脂）和Fab，研究了通过羟基胺（SZ）和汞合金（MF）和Fab的溶解的降解进行了蜕皮降解。首先在严格的厌氧条件下在连续生物反应器中培养Sz + MF。此后，接种I1 + I2，并提供微苯化的条件。甲烷和乙酸盐是通过SZ + MF在厌氧症中的主要降解产物，并在微侵入条件下进行SZ + MF + I1 + I2。然而，在微酮条件下（5％O-2）的醋酸盐产生高于四种微生物（0.41 +/- 0.07mmol天（-1）），而不是SZ + MF（0.23 +/- 0.05mmol天（-1））。 Sz + MF + I1 + I2（在微侵入条件下）比单独的Sz + MF（在严格的厌氧条件下）更快，分批测定中的含油降解更快。 I1 + I2能够与油酸含量和含油的中间体生长（氢气，乙酸盐和甲酸）。这项工作突出了Fab，尤其是对厌氧反应器的重要性，所述厌氧反应器治疗基于油酸的废水，因为它们通过保护来自氧气毒性的严格的厌氧对甲烷来加速黄油酯转化，并且通过作为替代氢/甲酸盐和醋酸盐清除剂进行LCFA-降解厌氧。

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