SSS 2011-04-05
时间：2019-01-08 作者：英语课 分类：Scientific American(四)月
This is Scientific American’s 60-Second Science. I’m Steve Mirsky. Got a minute?
A rolling stone gathers no moss 1. But a salamander embryo 2 can attract algae 3 inside its tissues and cells. This intimate co-habitation—the first ever seen between algae and a vertebrate—is revealed in the Proceedings 4 of the National Academy of Sciences.
Spotted 5 salamanders lay their eggs in pools in spring. And the egg capsules actually look green, thanks to the algae that surrounds the resident embryos 6. That relationship benefits both parties. Algae feed on the nitrogen-rich waste products generated by the embryos. And the embryos bask 7 in the oxygen given off by the algae. Take away their algae, and spotted salamander babies hatch smaller and less mature.
So that’s the eggs. But this study is the first to show that the algae actually inhabit the embryo itself. Using imaging techniques and DNA 8 testing, scientists found algae inside the cells of young salamander embryos—and even in the reproductive tracts 9 of some adult females, which suggests that some algae may be handed down directly from parent to child, more evidence that many individuals are really entire little ecosystems 10.
Thanks for the minute. For Scientific American’s 60-Second Science, I’m Steve Mirsky.
- Moss grows on a rock.苔藓生在石头上。
- He was found asleep on a pillow of leaves and moss.有人看见他枕着树叶和苔藓睡着了。
- They are engaging in an embryo research.他们正在进行一项胚胎研究。
- The project was barely in embryo.该计划只是个雏形。
- Most algae live in water.多数藻类生长在水中。
- Algae grow and spread quickly in the lake.湖中水藻滋蔓。
- He was released on bail pending committal proceedings. 他交保获释正在候审。
- to initiate legal proceedings against sb 对某人提起诉讼
- The milkman selected the spotted cows,from among a herd of two hundred.牛奶商从一群200头牛中选出有斑点的牛。
- Sam's shop stocks short spotted socks.山姆的商店屯积了有斑点的短袜。
- Somatic cells of angiosperms enter a regenerative phase and behave like embryos. 被子植物体细胞进入一个生殖阶段，而且其行为象胚。 来自辞典例句
- Evolution can explain why human embryos look like gilled fishes. 进化论能够解释为什么人类的胚胎看起来象除去了内脏的鱼一样。 来自辞典例句
- Turtles like to bask in the sun.海龟喜欢曝于阳光中。
- In winter afternoons,he likes to bask in the sun in his courtyard.冬日的午后，他喜欢坐在院子晒太阳。
- DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
- Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。
- vast tracts of forest 大片大片的森林
- There are tracts of desert in Australia. 澳大利亚有大片沙漠。
- There are highly sensitive and delicately balanced ecosystems in the forest. 森林里有高度敏感、灵敏平衡的各种生态系统。 来自《简明英汉词典》
- Madagascar's ecosystems range from rainforest to semi-desert. 马达加斯加生态系统类型多样，从雨林到半荒漠等不一而足。 来自辞典例句