Activity of urea enzyme
gypsum-urea (= urea-gypsum)
Humic acid-urea (long-term urea)
Humic acid-urea long-term urea
acetyl enzyme poly-lysine enzyme
enzyme-substrate complex (= enzyme-subtrate compound)
(13)C urea breathing test
(superscript 13)C-urea breath test
~(14)C-urea breath test(~(14)C-UBT)
13Carbon urea breath test
13C-urea breath test
13C尿素呼气试验
13C-尿素呼气试验
碳－13尿素呼气法
13C鄄尿素呼气试验
13C呼吸试验
13C-urea breath test 13C-UBT
13C-尿素呼气试验
13C-尿素呼气试验13C-UBT