A taxonomic kingdom, proposed in 1968, to include Bacteria (prokaryotes), divided into three divisions: those with a Gram-negative cell wall; those with a Gram-positive cell wall; and those with no cell wall. The name is no longer used.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。