Trivalent arsenic was more clastogenic than pentavalent arsenic. 三价砷的致染色体畸变作用大于五价砷。
Any of three anions,VO3,VO4,or V2O7,containing pentavalent vanadium. 钒酸盐三种阴离子，VO3，VO4，或V2O7之一，含有5价的钒
Any of three anions, VO3, VO4, or V2O7, containing pentavalent vanadium. 钒酸盐三种阴离子，VO3，VO4，或V2O7之一，含有5价的钒
Pentavalent antimonials (Sbv) meglumine antimoniate and sodium stibogluconate (SSG) have been the main first line drug for the treatment of all forms of leishmaniasis since 1940. 甲基葡胺五价锑剂和葡萄糖酸锑钠作为治疗各类利什曼病的一线药物，至今已有60多年的历史。
At the same time, Merck developed a pentavalent vaccine derived from five human-bovine reassortant strains that together would target the major strains of rotavirus. 此时，美国默克药厂研发了一种五价疫苗，由人及牛的五株病毒品系组成，可对付一些主要的轮状病毒品系。
Safety and Efficacy of a Pentavalent Human-Bovine (WC3) Reassortant Rotavirus Vaccine. T. Vesikari et al. in New England Journal of Medicine, Vol. 354, pages 23-32; January 5, 2006. 时至今日，在历经许多错误及起步失败之后，寻求有效疫苗的竞赛，终点已然在望：有好几个轮状病毒疫苗的安全及有效性，已经得到证实。
