叶原基和茎原基是在茎 顶端分生组织的表面发生, 这种起源方式称为外起源 (exogenous origin)。 三、茎的解剖结构 (一)双子叶植物 茎的结构 1、初生结构 双子叶植物茎的初生 结构包括表皮、皮层和维 管柱三大部分。
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First, amplitude bounded exogenous disturbance is considered and sufficient conditions that ensure the asymptotical stability of the origin of the systems is derived.
首先,考虑了振幅有界的外部干扰,得到了保证系统原点渐近稳定的充分条件。
The term exogenous refers to the origin of the lipid material outside the body. This material is aspirated into the bronchial tree.
外源性是指脂质源于体外,而后被吸入到支气管树。
In vitro DNA replication system derived from eukaryotes is capable of replicating exogenous plasmid DNA containing SV40 origin of replication efficiently and accurately.
报道了含sv40复制起点的质粒dna在真核细胞抽提物中进行复制的DNA体外复制系统的建立。
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