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Sentences with «at concentrations»
The technique is so sensitive that the researchers can distinguish dozens of compounds at concentrations of just parts per billion. (sciencemag.org)
The technique is so accurate and sensitive that he can determine if there is a molecule of any chemical present even at concentrations as low as one part per billion. (sciencedaily.com)
Very disturbing and horrific subject matter when reading about what went on at the concentration camp - hard to read at times and hard to believe this book is based on true events. (goodreads.com)