SSS 2010-01-29

Organisms evolved sexual reproduction so they could stay one step ahead of parasites. Or so the theory goes. But what about beasties that make babies without sex? How do they escape infection? A study in the journal Science suggests that for bdelloid

英文书摘精选 How Did Animals Survive The Ice Age?冰河世纪的动物如何生存?

During the last ice age, rapid swings in temperature occurred within decades or less, meaning populations of organisms had to adjust quickly to new environments or face extinction. 在最后一个冰河世纪中，温度在数十年甚至更短的时间

2008-12-06 墨西哥“水怪” 濒临灭绝

Beneath the tourist gondolas on Lake Xochimilco in Mexico lives a creature that resembles a monster. Known as the water monster or Mexican walking fish, the axolotl is type of salamander. The Ambystoma Mexicano, this species, is the axolotl of Xochi

专业术语—口腔生理学术语E3(英文详解)

Epidermal growth factor - a cytokine that stimulates epithelial cell proliferation. Epinephrine - a neurotransmitter substance found at all adrenergic synapses (nor epinephrine or epinephrine). It is

亡者归来:三分之一绝种动物再现世间

Conservationists are overestimating the number of species that have been driven to extinction(消失), scientists have said. A study has found that a third of all mammal species declared extinct in the past few centuries have turned up alive and well

The extinction of men

Neil: Hello and welcome to Six-Minute English from BBC Learning English, I'm Neil and with me today is Rosie. Rosie: Hi there. Neil: Well, today we're talking about men. Rosie: That sounds interesting. Neil: It is very interesting especially if you'r

2005年NPR美国国家公共电台九月-Scientists: Male Chromosome Won't Lead to

Scientists at the Whitehead Institute in Cambridge, Massachusetts say it's fortunate for humans that the Y chromosome is not on the verge of extinction. That's because the Y is the chromosome that makes males males. The outlook is less favorable for

科学家旨在在生物灭绝之前冻结其DNA

Scientists Aim to Freeze DNA Before Creatures Die Off 科学家旨在在生物灭绝之前冻结其DNA Earth is in the middle of its sixth mass extinction. The last such event took place 66 million years ago, when an asteroid a huge space rock - hit

VOA慢速英语2015 科幻变成现实的物种调查

AS IT IS 2015-01-09 Science Fiction Becomes Reality for Species Surveys 科幻变成现实的物种调查 Many science fiction stories tell about explorers arriving in a new world. The explorers then use some kind of high-tech device to test for brea

VOA标准英语2008年-Australian, US Scientists Bring Extinct Gene Ba

By Phil Mercer Sydney 21 May 2008 Australian and U.S. scientists have successfully inserted a gene from the extinct Tasmanian tiger into a mouse embryo. They say the result has been bone and cartilage from the extinct marsupial developing inside the

VOA标准英语2010年-Genetically-Modified Mosquito Can't Tr

Under UV light, this mosquito larva reveals a red fluorescent marker in its nervous system, causing eyes and nerves to glow. The marker's presence tells the researchers in Riehle's team that this individual carries the genetic construct rendering it

美国国家公共电台 NPR A Mountain Lion Kitten Is Found, Leading To Excitement And Concern

LOURDES GARCIA-NAVARRO, HOST: OK, now for some cute but worrying science from the animal world. The Santa Monica Mountains National Recreation Area posted a photo earlier this week that is insanely adorable. It's of a newly found mountain lion kitten

英语听力：自然百科 墨西哥“水怪” 濒临灭绝

Beneath the tourist gondolas on Lake Xochimilco in Mexico lives a creature that resembles a monster. Known as the water monster or Mexican walking fish, the axolotl is type of salamander. The Ambystoma Mexicano, this species, is the axolotl of Xochim

VOA常速英语2008年-New Hope for Threatened 'Devil' Marsupials in A

By Phil Mercer Sydney 01 April 2008 Researchers in Australia say a Tasmanian devil called Cedric could hold the key to the survival of the embattled species. The world's largest marsupial carnivore is facing extinction because of a mystery facial can

英语新闻视频：Sun Bears - World's smallest bear face extinction

Cambodia is home to the largest population of sun bears left in the wild. As the worlds smallest bear species, they are now facing a high risk of extinction due to the twin threat of habitat loss and illegal hunting. Charities are working hard to sav

中国发现新的长臂猿物种

Scientists have discovered a new species of gibbon living in south-west Chinas rainforests. 科学家在中国西南地区的热带雨林里发现了新的长臂猿品种。 Although scientists had been studying the primate for some time new research

Ecologists Call for Action on Biodiversity Loss

1. Why that two-timing! 为什么那么不专情。 2. Don't let it get you down. There are plenty of fish in the sea。 别让这件事影响你的情绪。天涯何处无芳草。 3. Are you cheating on me? Because I've been hearing some rumors。 你

以蚊攻蚊：千万转基因蚊子即将释放野外

提起蚊子的天敌，我们第一时间想到的是蚊香，但是现在科学家有了更好的办法：以蚊攻蚊，让带有基因缺陷的转基因蚊子去对付它的自然同伴，最后让蚊虫家族自行灭绝。这种转基因雄性蚊

经济学人:进化生物学:古人类异血缘交配的证据 (1)

Set aside romantic sentiment. Sex is a biological insurance policy. 除了浪漫调情，性也是一份生物保险单。 By chaotically mixing their genetic information, animals generate extraordinary diversity. 通过将基因信息杂乱混合，动

万物简史 第323期:美丽而危险(6)

The ash fall from the last Yellowstone eruption covered all or parts of nineteen western states (plus parts of Canada and Mexico), 上一次黄石火山爆发所喷出的火山灰，铺满了西部19个州的全部地区或部分地区（加上加拿大