庚: 名词1.(天干的第七位) the seventh of the ten heavenly stems2.(年龄) age 短语和例子同庚 of the same age; born in the same year; 贵庚? may i know your age?3.(姓氏) a surname 短语和例子庚季良 geng jiliang
So it has increasing commercial demand . escherichia coli and many other microoganism synthesize aromatic amino acids through the condensation reaction between phosphoenolpyru vate ( pep ) and erythrose - 4 - phosphate ( e4p ) to form 3 - deoxy - d - arabinohep tulosonate 7 - phosphate ( dahp ) . pep and e4p are limiting substrates for formation of dahp 大肠杆菌和许多微生物一样,其合成芳香族氨基酸的起始物是由磷酸烯醇式丙酮酸( pep )和4 -磷酸赤癣糖( e4p )二者缩合形成的3 -脱氧- -阿拉伯庚酮糖酸- 7 -磷酸( dahp ) 。