Adenine a nitrogenous base ( 6 - amino - purine ) found in dna and rna 腺嘌呤:在dna和rna中发现的含氮的碱基( 6氨基嘌呤) 。
Acyl amine compounds containing nitrogen are rare in the plant essential oil 含氮的酚胺类化合物在植物挥发油中并不多见。
Chitin a nitrogen - containing polysaccharide found in the cell walls of most fungi and in some animals 几丁质:在大多数真菌和一些动物的细胞壁中发现的含氮的多糖。
" the key point is that the gulf of eilat is an oligotrophic sea , a sea that does not have nitrogen at all , " loya explained 洛亚解释道: “关键是埃拉特海湾是一片营养贫乏、完全不含氮的海域。 ”
They contain nitrogen and usually occur as salts of asids such as citric , malic , and succinic acids such as citric , malic , and succinic acids 它们是一类含氮的,一般由酸性盐如柠檬酸,苹果酸,琥珀酸所形成。
Letter of declaration that all goods are azo dyes free , low cadmium and plastics parts are phthalate free signed by the supplier on their company ' s letterhead 公司声明在供应尚信签的抬头上显示所有的货物不含氮的染料,不含低镉及塑料部分不含酞酸盐
Biochemistry ) a nitrogenous molecule , either a pyrimidine or a purine , that combines with a pentose sugar and phosphoric acid to form a nucleotide , the fundamental unit of nucleic acids 2碱基:一种含氮的分子,嘌呤碱或者是嘧啶碱,它们和戊糖还有磷酸一起构成核苷酸,核苷酸是核酸的基本结构单位。