Doctors order a blood urea nitrogen (BUN) test to measure the amount of urea nitrogen in your blood. It helps them see how well your kidneys are working. A BUN test measures how much blood urea ...
Ammonia-oxidizing archaea (AOA) are some of the most abundant microorganisms in the ocean and play a key role in nitrogen cycling. Yet, despite their ubiquity, scientists have long puzzled over how ...
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