Viruses are the most abundant biological entities in global ecosystems and are recognized as a crucial and ubiquitous component of the microbial food web, with abundance in marine waters ranging from 10 6 ml –1 in the deep sea to 10 8 ml –1 in coastal waters and 10 9 g –1 of dry weight in the marine sediments 1,2 , which is usually 15-fold greater than bacterial and archael abundance 3 . Viruses are the smallest known organisms (20–200 nm) with simple biological structures consisting of nucleic acid, either DNA or RNA (single- or double-stranded), with a protein coat (capsid).
展开▼
机译：病毒是全球生态系统中最丰富的生物实体，被认为是微生物食物网的关键和普遍存在的组成部分，海水中的丰度范围从深海的10 6 ml –1到沿海水域的10 8 ml –1和10 9 g –1的海洋沉积物1,2中的干重，通常比细菌和古细菌的丰度3大15倍。病毒是已知的最小生物（20-200 nm），具有简单的生物结构，该结构由DNA或RNA（单链或双链）核酸以及蛋白外壳（衣壳）组成。
展开▼
