- UID
- 1486091
- 在线时间
- 小时
- 注册时间
- 2021-2-21
- 最后登录
- 1970-1-1
- 主题
- 帖子
- 性别
- 保密
|
【自然科学-生物】A tiny creature illuminates an important biological advance(The Economist-872字 短精读)
Eukaryotic cell >> = tv documentaries >> have lots of internal structure >> organelles >> evolve & sophisticated >> research in SZ
Collaboration >> 2bn yrs >> archaean & other bacteria >> ancestors >> mitochondria (MCD) >> own genomes >> gather energy-rich molecules >> atp >> power chemical reactions >> react glucose with o2 >> h2o & co2 >> mcd evolve accordingly
Less effective >> anaerobic rep >> only h20 >> still mcd >> further research
Ciliates >> live without o2 >> make up it by rich ch4 and hno3
Mathanotrophs >> consume ch4 as food >> use hno3 as o2 sub
No desire results >> but find genomes based on hno3 rather than o2 >> it is not free living organism >> hosted by ciliates
But not parallel in the experiment >> research still going on >> show organelles formation
Archaean 太古代
【自然科学-物种】Cod Fish( WSY -407 字 短精读)
NA >> cod fish die out >> 1990s >> prey increase >> to recover cod fish >> limit fishing >> unmolested >> grow eggs >> grow population
Recovery took 5-6 yrs >> WRONG >> failed >> languish few pre-collapse population
Reason: pre>> based on the speed of reproduce >> not food web organization >> adult cod eat forage fish >> ff eats zooplkt (eggs and larvae of cod)
Before distinct: keep the number of forage>> keep the #eggs >> keep the #cod ,but when cod decrease, forage grow, and eats more eggs
Complexity of the eco system
|
|