单词：Vibrio alcaligenes
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“I have a dream...” It is among the most celebrated speeches in American history. “My four little children will one day live in a nation where they will not be judged by the color of their skin
疯狂英语2002年
In this Moment of Science Yael and Don discuss how women can see more color. Yael: Not only are eight percent of men colorblind, but even compared to men who can distinguish between reds and greens, many women may live a more colorful existence. That
英语听力文摘 English Digest
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 bacteria al
Scientific American(九)月
Shareholders of the telecommunications equipment manufacturers Alcatel and Lucent have approved an $11 billion merger of the two companies. The new company, which will be called Alcatel Lucent, will be the world's largest telecommunications equipmen
初级商务英语听力2006
What Is Progeria? Progeria was first described in the nineteenth century. The mysterious disease is often thought of as premature aging. Children with progeria are normal for their first year of life, but then develop medical problems normally seen i
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Why Does Spot Have Spots? In dogs with multicolored coats, white areas have no pigment cells. Black, brown or yellow areas, on the other hand, get their color from special pigment cells. When a dog is just an embryo, these pigment cells travel from t
英语听力文摘 English Digest
Glow In The Dark Cats, Monkeys, And HIV Have you heard the one about the jellyfish, the monkey, and the glow in the dark cat? Actually, its no joke: scientists are experimenting with ways to combat HIV and AIDS by injecting cats with genes taken from
英语听力文摘 English Digest
How Neanderthals Fought Disease Every year people are encouraged to get their annual flu shots. Signs are posted at drug stores and clinics. Get your shots here. Modern preventive medicine has saved millions of lives. But you may be surprised to hear
英语听力文摘 English Digest
Winter Wheat According to the famous song, America is beautiful for its spacious skies, purple mountains, and amber waves of grain. If you were to make a music video based on these lyrics youd probably want mid to late summer images of fruit-laden tr
英语听力文摘 English Digest
Ya?l: Somebody bought my daughter a game called Cuddies. Don: I love that game！ Y: I don't know about that. But the little plastic tongue-like part of that strange insect like body did inspire me to wonder about taste and insects. Do insects have t
英语听力文摘 English Digest
About six or seven million years ago chimpanzees and humans evolved from a common primate ancestor. Chimps went on to become the relatively small-brained, forest dwelling creatures we know and love. Humans went on to evolve large brains, spread throu
英语听力文摘 English Digest
Why are there males and females? Why are there two sexes instead of three, or twelve, or one? On todayss Moment of Science we'll learn why two is the magic number. Let's start with why there is sex at all. When two organisms reproduce sexually, sperm
英语听力文摘 English Digest
Nutrigenomics The study of genes has shown that every individual is genetic ally unique, and this discovery leads to a host of questions as to the relationship between an individuals genes and environmental factors such as diet. That is, how does die
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DNA Wrath of Khan 成吉思汗疯狂的基因 Today, Afghanistan is a war-torn region, battled over by military forces and world-spanning empire s . Eight hundred years ago things were much the same. Only then, there was only one ruler: Genghis Khan.
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Dmitry Belyaev, Foxes, And Domestication 你与猫或狗玩耍过吗？在远古，狗对我们的祖先来说还是一种比较危险的动物呢。那么，现在为什么它们这么听话？我们的祖先又是如何驯化它们的呢？今天，就
英语听力文摘 English Digest
Nutrigenomics 营养基因组学（nutrigenomics 或nutritional genomics，又叫营养遗传学 nutrigenetics）是研究营养素和植物化学物质对机体基因的转录、翻译表达及代谢机理的科学。 膳食是影响人体健康最重
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The reason that Vibrio fischeri is doing that comes from the biology. 费氏弧菌的发光现象来自生物学上的原因。 So again, another plug for the animals in the ocean, Vibrio fischeri lives in this squid. 接下来，我们再来看一个海
TED演讲教育篇
Mans Best Friendin All Shapes and Sizes Scientists are making great strides in understanding the genes that allow such a wide range of shapes, sizes and personalities in different dog breeds. Did you know domestic dogs were bred from wolves about 15,
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The Ancestry Of Snakes 古生物学界的一部分学者认为，蛇是由陆地蜥蜴的一个分支进化而来的，在进化的过程中，它们的脚逐渐退化消失了，而身子则变得越来越细长。另一种流行观点则认为蛇的前
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Fatherless Honeybee s How male honeybee s can be without fathers? The reason lies in whats called a haploidiploid system of sex determination. Approximate ly one-fifth of the animal kingdom, including ants and wasp s , use this system. What it boils
英语听力文摘 English Digest