Nature makes amide bonds—the key linkages that string together amino acids in a polypeptide—like a knitting whiz. The ribosome in Escherichia coli bacteria, for example, can make eight amide bonds in ...
What is a peak expiratory flow rate test? The peak expiratory flow rate (PEFR) test measures how fast a person can exhale. The PEFR test is also called peak flow. This test is commonly performed at ...
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