SSS 2008-05-21
时间：2018-12-24 作者：英语课 分类：Scientific American(五)月
This is scientific American's 60-Second Science, I'm Christopher Intagliata. Got a minute?
The yeast 1 Candida albicans ekes 2 out a quiet living in our gut 3. But it’s a tough life. It faces acids and enzymes 4, and the immune system always bullies 5 invaders 6. So Candida has customized its reproductive cycle for life inside a warm-blooded host. Researchers described it in the journal Public Library of Science Biology. Human cells have two copies of each chromosome 7. In sexually reproducing organisms like us, a process called meiosis halves this number. Mom’s egg and Pop’s sperm 8 only have one copy of each chromosome—together they make a whole. That’s you. But Candida doesn’t bother with meiosis when it mates. So its progeny 9 have double the normal amount of chromosomes 10, which they randomly 11 toss off til they’re near the right number again. This cycle is useful for a gut-dweller for two reasons. First, Candida often trashes fewer copies of some chromosomes and more of others. The chromosomal 12 grab bag that results is genetically 13 diverse, and some strains are resistant 14 to antifungal drugs. Second, normal fungal sexual reproduction usually produces spores 15, which the immune system can easily identify and dispose of. Without spores, Candida can better avoid getting busted 16.
Thanks for the minute, for Scientific American’s 60-Second Science, I'm Christopher Intagliata
- Yeast can be used in making beer and bread.酵母可用于酿啤酒和发面包。
- The yeast began to work.酵母开始发酵。
- This year book ekes out souvenir of my life in the university. 这本年鉴帮助我追忆大学生活。 来自辞典例句
- I will no longer chew the cud of misfortune that Fate ekes out to us. 我将不再反复地思考命运给我们的不幸。 来自辞典例句
- It is not always necessary to gut the fish prior to freezing.冷冻鱼之前并不总是需要先把内脏掏空。
- My immediate gut feeling was to refuse.我本能的直接反应是拒绝。
- It was said that washing powders containing enzymes remove stains more efficiently. 据说加酶洗衣粉除污更有效。
- Among the enzymes which are particularly effective are pepsin, papain. 在酶当中特别有效的是胃朊酶、木瓜酶。
- They prepared to repel the invaders. 他们准备赶走侵略军。
- The family has traced its ancestry to the Norman invaders. 这个家族将自己的世系追溯到诺曼征服者。
- Chromosome material with exhibits of such behaviour is called heterochromatin.表现这种现象的染色体物质叫做异染色质。
- A segment of the chromosome may become lost,resulting in a deletion.染色体的一个片段可能会丢失，结果产生染色体的缺失。
- Only one sperm fertilises an egg.只有一个精子使卵子受精。
- In human reproduction,one female egg is usually fertilized by one sperm.在人体生殖过程中，一个精子使一个卵子受精。
- His numerous progeny are scattered all over the country.他为数众多的后代散布在全国各地。
- He was surrounded by his numerous progeny.众多的子孙簇拥着他。
- Chromosomes also determine the sex of animals. 染色体也决定动物的性别。 来自《简明英汉词典》
- Each of four chromosomes divide longitudinally. 四种染色体的每一种都沿着纵向分裂。 来自《现代汉英综合大词典》
- Within the hot gas chamber, molecules are moving randomly in all directions. 在灼热的气体燃烧室内，分子在各个方向上作无规运动。 来自辞典例句
- Transformed cells are loosely attached, rounded and randomly oriented. 转化细胞则不大贴壁、圆缩并呈杂乱分布。 来自辞典例句
- Like mRNA, both tRNA and rRNA are transcripts of chromosomal DNA. tRNA及rRNA同mRNA一样，都是染色体DNA的转录产物。 来自辞典例句
- In mammalian species, a variety of chromosomal rearrangements are known to exist. 在哺乳类的物种中，已知有许多类型的染色体内部重新排列。 来自辞典例句
- All the bees in the colony are genetically related. 同一群体的蜜蜂都有亲缘关系。
- Genetically modified foods have already arrived on American dinner tables. 经基因改造加工过的食物已端上了美国人的餐桌。 来自英汉非文学 - 生命科学 - 基因与食物