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Methanotrophs and Methanogens in Masonry

机译：砌体中的甲烷营养菌和产甲烷菌

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Methanotrophs were present in 48 of 225 stone samples which were removed from 19 historical buildings in Germany and Italy. The average cell number of methanotrophs was 20 CFU per g of stone, and their activities ranged between 11 and 42 pmol of CH4 g of stone?1 day?1. Twelve strains of methane-oxidizing bacteria were isolated. They belonged to the type II methanotrophs of the genera Methylocystis,Methylosinus, and Methylobacterium. In masonry, growth substrates like methane or methanol are available in very low concentrations. To determine if methane could be produced by the stone at rates sufficient to support growth of methanotrophs, methane production by stone samples under nonoxic conditions was examined. Methane production of 0.07 to 215 nmol of CH4 g of stone?1 day?1 was detected in 23 of 47 stone samples examined. This indicated the presence of the so-called “mini-methane”-producing bacteria and/or methanogenic archaea. Methanotrophs occurred in nearly all samples which showed methane production. This finding indicated that methanotrophs depend on biogenic methane production in or on stone surfaces of historical buildings.
机译：甲烷营养菌存在于225个石料样品中的48个中，这些样品是从德国和意大利的19座历史建筑中移除的。甲烷甲烷营养菌的平均细胞数为20 CFU / g石头，其活性范围为11至42 pmol CH4 g石头– 1天– 1。分离出十二种甲烷氧化细菌。它们属于甲基囊藻，甲基肌球菌和甲基杆菌属的II型甲烷营养生物。在砌体中，生长底物（如甲烷或甲醇）的浓度非常低。为了确定石头是否能够以足以支持甲烷营养生物生长的速率产生甲烷，研究了在无氧条件下石头样品产生的甲烷。在所检查的47个石材样品中，有23个样品检测到甲烷生成CH4 g？1 day？1的甲烷的量为0.07至215 nmol。这表明存在所谓的“产生微型甲烷”的细菌和/或产甲烷的古细菌。甲烷几乎发生在所有显示甲烷产生的样品中。这一发现表明，甲烷氧化菌取决于历史建筑内或石材表面上的生物甲烷生成。

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