Scientific American 60 Second Science听抄（有音频文件）

lintelleUID：2297267

Silkworms make silk, that much you knew. But did you know that these industrious little caterpillars can spin silk of different colors? White, yellow, pink, even green. Silkworms get the pigments that used to color the gossamer product from mulberry leaves, the only food they eat. They then use the silk to make themselves some seriously comfy cocoons. Some mutant silkworms can only make white cocoons. These monochromatic characters have mutation in a gene called Y, which stands for yellow blood. They don't absorb the yellow color carotenoid from mulberry leaves, so their blood is colorless and their cocoons are white. This week scientists from Japan announced that the Y gene produces a protein that grabs onto carotenoids. This protein allows cells in the gut to extract the yellow pigment from mulberry leaves, and cells in the silk grant to(not sure) take it up from the blood. By providing mutant silkworms with a good copy of the Y gene, the scientists were able to restore the ability to make yellow cocoons. Such genetic manipulations might someday allow researchers to engineer silkworms that make custom-colored silk. Then with a little extra tweaking(not quite sure), maybe they can get the worms to monogram your silk PJs(pajamas的简称) as well.

也是学长帮忙听的~:loveliness:
那个in the silk grant to 他也不知道是什么。明天还是去找Mr. Butt去——如果他也不知道，估计就没办法了。这个学期没有科学学科，Ms. Stocks不在学校，真是遗憾啊。

lintelleUID：2297267

加多了吗？寒……
咱们窝家里偷偷说哦~别让其他斑竹看见了，偶要挨罚滴~:o

lintelleUID：2297267

偶考试那会儿也是一个状况。
你本身有实力，考场上适当做点笔记就能集中注意力了，没什么大问题的。

lintelleUID：2297267

A heart beats 3 billion times in an average life span, and sometimes those beats race, like when you run into a grisly bear, or climb stairs or fall in love. Such moments can more than double the average heart rate of 70 beats per minute, speeding  it up to 160 beats. And we feel it-palpitations, dizziness, breathlessness. Scientists have a good idea what causes a racing heart an increase in adrenaline in(no in)sends a signal to the pacemaker cell located in the upper-right chamber. The cell then sets off  a domino effect that speeds up the muscle contractions. What scientists don't understand though is what makes the heart beats slow back down. But a team at the University of Illinois at Chicago city found a promising clue. If isolated enzyme called p-21 activated kinases or PAK-1 that affects electrical channels inside the pacemaker cell. Scientists have shown that by turning on PAK-1 they can reduce electrical channel activity and slow down the heart. They’re now working on finding a drug treatment that can control this enzyme, hoping that medicine might replace artificial pacemakers. Be still my beating heart.

lintelleUID：2297267

You've probably heard that the world's honeybees have suffered stinging losses lately, that's a big story for us too. Up to 12 billion dollars in crops rely on the fuzzy fliers for pollination, of the 2.4 million honeybee colonies in the U.S. about 1 million died off this past winter. Big declines have also been seen in Europe and Asia. The die-off has been dubbed Colony Collapse Disorder and the Vanishing Bee Syndrome. A couple of species of mites that attack bees were responsible for similar die-offs in the winters of 95, 96 and 2000, 2001, and the mites may be partly to blame for the most recent honeybee losses, but a quarter of the current carnage seems unrelated to mites or any other pests. Other suggested causes of the bee decline include genetically modified foods, parasites, pesticides, and cell phone radiation. But bee expert Nicholas Calderone of Cornell University said last week that the definitive cause remains elusive, he will spend this summer investigating honeybee colonies throughout the northeast trying to solve the case of dead bees. Here's hoping he buzzes in with an answer.

lintelleUID：2297267

谢谢指教~
偶懒也不是一天两天了，sciam那个主站不怎么去的来着。汗颜

lintelleUID：2297267

今天学校真是暴动了。英语母语的老师全部没来呵……:mad

版上第一个sciam听抄的人回来报分了。给大家看看，增长信心^^
https://bbs.gter.net/bbs/viewthre ... e%3D1#pid1770248536
他的听抄贴在本版精华区里。

lintelleUID：2297267

请看一楼

lintelleUID：2297267

回来冒个头。
还不知道再过多久才能回来，跟你们这些高手一起练习的大好机会就这么错过了。:( :(

你原来也知道熬夜对学习不好的啊~sigh

woodman, xixihehe, Tina都是六月考试对吧？诚心祝福。