美国科学60秒 SSS 2012-09-07
时间：2018-12-24 作者：英语课 分类：Scientific American(九)月
As a kindergarten teacher might say, sharing is caring. She might not mention that cooperation is also a great way to form a community and thus improve everyone's chances of survival. Humans aren't only ones to apply this strategy. Marine 1 bacteria also form cooperative populations according to a study in the Journal Science. Researchers examined the genomes of bacteria belonging to the Vibrionaceae family. In the lab, they grouped together bacteria with similar genetics that coexist in the same micro-habitat. The scientists expected that within any given population, individuals capable of producing antibiotics 2 would use these chemical weapons against others. But when they looked at interactions between different strains of Vibrionaceae, they found that only a few members of any given population could produce the bacteria-killing substances, and the rest of that community was resistant 3 to those particular compounds. But antibiotics could fight off foreign populations while leaving members of the home group unharmed. This arrangement implies a bacterial 4 social structure where individuals help the group as a whole. Crayon-hoarding toddlers might want to take note.
- Marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
- When the war broke out,he volunteered for the Marine Corps.战争爆发时，他自愿参加了海军陆战队。
- the discovery of antibiotics in the 20th century 20世纪抗生素的发现
- The doctor gave me a prescription for antibiotics. 医生给我开了抗生素。