"They might be tightly linked to the development of soil on land," said Dr. Baldauf, the Swedish biologist, who is analyzing the DNA of species discovered in the Eumycetozoan Project.

“他们或许与陆地土壤的变迁有紧密联系，”瑞典生物学家巴尔道夫说。他正在对黏菌工程中发现的黏菌品种进行DNA分析。

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Instead of analysing the genome of a specific organism, scientists sequence all the DNA they find in environmental samples, ranging from seawater to soil.

有别于分析特定生物的基因组，科学家对取自海水、土壤等自然界的生物样本，统统进行DNA测序。

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DNA content was unaffected when soil water content was above wilting point.

DNA含量则不受土壤含水量高于萎蔫点的水分胁迫影响。

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They used new techniques that can identify ancient genetic information from an archaeological find, even when large amounts of DNA from soil bacteria are also present.

BBC: Fossil human traces line to modern Asians

Metagenomics takes another approach, basically putting an entire environment--the water in an ocean, the soil in a forest or the insides of an animal--into a DNA sequencer.

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