不同部位的木质化的程度不同，原生木质部中只有轻微的加厚，而在厚壁组织和一些木质部导管中则进一步加厚，平均含25%-30%的木质素和50%的纤维素。
The degree of lignification varies from slight in protoxylem to heavy in sclerenchyma and some xylem vessels, but values of 25-30% lignin and 50% cellulose are average.
应用漂浮导管监测前列腺素E1（PGE1）对11例以二尖瓣狭窄为主的风湿性心脏病合并肺动脉高压患者的体循环和肺循环的血液动力学作用。
The hemodynamic effects of prostaglandin E1(PGE1)on pulmonary and systemic circulations were studied in 11 patients with rheumatic mitral disease complicated by pulmonary hypertension.
目的：探讨肝素抗生素封管治疗中心静脉置管导管感染的临床意义。
Objective: To investigate the clinical significance of treatment of central vein catheter infection with heparin and antibiotics impregnation of catheter.
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