论文部分内容阅读
细菌是地球上最古老、最低等的植物。它的发生发展经历了35—37亿年,现在已被人类探知的总计1370种。它给我们的印象可用一个“小”字概括,直径一般0.5—2微米,以致说到肉眼看不见的物体,总是先想到细菌。细菌微乎其微,却本领高强。在整个生物圈内,空气、土壤、水域及生物体内到处都有它们的存在。植物的叶片、叶鞘,动物及人体的口腔、肠道、腋窝、会阴和泌尿生殖道,都是细菌恋恋不舍的营寨。在这里吸收营养、分解物质,每隔15—30分钟就繁殖一代,一个细菌一天可产
Bacteria are the oldest and lowest on Earth. Its occurrence and development have gone through 3.5-37 billion years and it has now been discovered by mankind totaling 1,370 species. The impression it gives us can be summed up in a “small” word, typically 0.5-2 microns in diameter, so that when it comes to invisible objects, bacteria are always thought of first. Very little bacteria, but powerful. Within the entire biosphere, they exist in the air, in soil, in water and in living things. Plant leaves, leaf sheaths, animals and human oral, intestinal, armpit, perineum and genitourinary tract, are reluctant to camp bacteria bacteria. Here to absorb nutrients, decomposition of material, every 15-30 minutes to breed a generation, a bacteria can produce a day