Sentences with phrase «revealed higher levels of the stress hormone»
Bacteria - free mice exhibited higher levels of risk - taking, and neurochemical analysis revealed higher levels of the stress hormone cortisol and altered levels of the brain chemical BDNF, which has been implicated in human anxiety and depression.
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In the June issue of Conservation Biology, Creel's group reveals that elk in Yellowstone National Park show higher levels of the stress hormone during the snowmobile season and that levels rise and fall with the amount of daily snowmobile traffic.