Sentences with phrase «modern contamination»

We used ultrafiltration methods, which purify the extracted collagen from bone, to avoid the risk of modern contamination.

The Redmond salt deposit begins about 30 feet below the surface, covered by a layer of bentonite clay, which has protected it from erosion and from the possibility of modern contamination.

Global aquifers dominated by fossil groundwaters but wells vulnerable to modern contamination.

But that study used polymerase chain reaction, a method that efficiently finds and extracts targeted DNA fragments but can not always reliably distinguish between ancient DNA and modern contamination.

Maidment was skeptical: «I thought it had to be bacteria, or pollen, or modern contamination.»

Now, palaeontologists have taken another look and found it is ostrich, thanks to some modern contamination.

In some of the cases, the theorized relationship between the sediments and temperature was actually reversed by the modern contamination.