古细菌的细胞壁缺乏胞壁质，其连接是醚连接而不是酯连接。
Archaean cell walls lack murein, and their lipids have ether links rather than ester links.
细菌分为真细菌和古细菌两类。
嗜盐古菌是一类生活在高盐环境中的古细菌。
Halophilic archaea had been isolated from various hypersaline environments.
目的研究牙周治疗对龈下菌斑中古细菌定植的影响。
Objective To investigate the effects of periodontal therapy on Archaea colonization in subgingival plaque.
在一些古细菌和真细菌中，表层蛋白是细胞膜最外层的结构。
S-layer (surface layer) has been identified as the outermost structure of cellular envelopes in numerous organisms from bacteria and archaea domains.
论文的第三部分介绍了应用Z曲线方法对细菌和古细菌的基因识别。
The third part of the paper proposes the application of Z curve method in the recognition of protein-coding genes in prokaryotic genomes.
科学家认为甲酸盐做为供养生命的能量源简直太苛刻了，但是这些古细菌却很好地生存下来。
Scientists thought formate was too poor an energy source to support life. But these archaea do fine.
我们还发现基因组的GC含量比进化上的亲缘关系对于细菌、古细菌的基因识别更为重要。
We also find that the genomic GC content of bacterial and archaeal genomes is more important than phylogenetic lineage in gene recognition.
当类似古细菌的细菌存在于形态组织及基因组中时，其基因组复制方法表现出类似真核样。
While archaea resemble bacteria in morphology and genomic organization, they resemble eukarya in their method of genomic replication.
AGU会议上的三个报告将聚焦古细菌对全球气候和营养显著影响方面的一些令人惊奇的新发现。
Three AGU presentations will focus on surprising new findings about the significant impact of archaea on global climate and nutrition.
由于更多的古细菌基因组被测序，有效的研究和分析工具需要整合这些多样多样的对任何给定位点可用的信息。
As more archaeal genomes are sequenced, effective research and analysis tools are needed to integrate the diverse information available for any given locus.
这意味着细菌（虽普遍存在但能否称为“物种”则备受争议）以及地球生命排在第三等级的古细菌都被排除在外。
That means leaving out the bacteria, which are ubiquitous but for whom the concept of 'species' is rather problematic, and the archaea, the third great class of Earthly life.
这意味着细菌（虽普遍存在但能否称为“物种”则备受争议）以及地球生命排在第三等级的古细菌都被排除在外。
That means leaving out the bacteria, which are ubiquitous but for whom the concept of 'species' is rather problematic, and the archaea, the third great class of Earthly life.
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