The recent work has been made possible by new techniques of molecular biology that allow viral DNA to be detected at low concentrations in the environment.

分子生物学的新技术使最近的工作成为可能，这种新技术能在环境中检测到低浓度的病毒 DNA。

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In this more benign environment, development proceeded normally, and the woman became pregnant with triplets who carried a mix of her DNA and her husband's — pretty much like any normal baby.

在这种更为有利的环境中，细胞发育正常进行。这位妇女怀上了三胞胎，胎儿携带着她和她丈夫两人的DNA——这跟其他正常的婴儿没什么大的差别。

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Previous studies have shown that factors in the mother's environment during pregnancy can cause "epigenetic" modifications to the fetus's DNA.

之前的研究表明，母亲怀孕期间的环境因素可能会导致胎儿的DNA出现“表观遗传”变异。

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For a great many years evolution was conceived as being driven externally by environmental pressures and internally by mutations in DNA. Mutations in the DNA created genetic diversity and when there were changes in the environment, those animals with the mutated DNA were sudden in a more favorable position.

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Certain inherited DNA mutations might play a role, as well as chemicals in our environment or diet.

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Researchers analyzed water samples for DNA fragments released to the environment, called eDNA. They found silver carp eDNA in Iowa, where the fish are abundant, but none near St.

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