【Phat Yeti出品】60-SECOND SCIENCE 官方听力文稿 + 讨论帖 （更新至：2008.03.07）

豆豆～UID: 2378384

Salad Dressing Science Mixes Up Researchers

Vinaigrette dressing. When you shake it, little vinegar droplets scatter through the oil. But when you put it down, the droplets merge and the dressing separates. That’s probably not a big inconvenience to you, but it is to industries that use lots of vinaigrette-like mixtures. So to study this unmixing, French researchers planned to float water droplets one at a time through a channel of flowing oil. The channel widened in the middle, so the oil would slow down and bump the water droplets together. Then the passage narrowed again, so the oil would speed up and pull the droplets apart.

The researchers expected that the droplets would merge when they bumped together. But that’s not what happened. In fact, it was when the droplets started to pull apart from each other that they suddenly mixed. In Physical Review Letters, the researchers say that the pulling apart may make the pressure between the droplets fall. That would make the droplets burst open, and then they could merge into one big water droplet. What the researchers don’t say is whether this finding could lead to a true breakthrough: stay-mixed salad dressing

zhoushengyuanlyUID: 2246479

up

nanokevinUID: 2264770

感謝分享 要多多練習 ^^

深海lavenderUID: 2350207

顶.:eek: LS好强...注册了一年多居然这是第一帖?ORZ......

zhoushengyuanlyUID: 2246479

:eek::funk:  :eek: :funk:

海边的安徒生UID: 2434053

很棒的帖子，超喜欢Karen Hopkin的声音

zhoushengyuanlyUID: 2246479

up...

豆豆～UID: 2378384

Parasitized Ants Get Berry Sick

When is an ant like a piece of fruit? When it’s infected by a parasite. Researchers affiliated with the Smithsonian Tropical Research Institute discovered this bizarre occurrence in Central America as they were studying the gliding ability of a certain species of ant. They found some colony members with bright red swollen abdomens. The scientists took specimens back to the lab and discovered they were full of hundreds of nematode eggs. The bright red bellies look suspiciously like the brilliant red and pink berries that proliferate in the rainforest.

Researchers think that the nematode makes the ant look like fruit to get birds to eat the ants. Birds usually keep the ants off their menu because of armor and a bad chemical taste. The birds then spread parasite eggs in their droppings. Ants forage through bird droppings for seeds. They feed the infected droppings to ant larvae, beginning the infection process all over again. The red-bellied ant is the first known case of a parasite causing fruit mimicry. One of the researchers was surprised that something “dumb as a nematode” can manipulate its host in such a sophisticated way. But evolution works no matter how dumb organisms are.

rainbow12cnUID: 2298895

谢啦~这些都是搂主听出来的吗？佩服~~

zhoushengyuanlyUID: 2246479

google...

深海lavenderUID: 2350207

显然不是......那些BT的专业词估计除了学那专业的没人能听出来......

zhoushengyuanlyUID: 2246479

这也没准。。林子大了。。什么BT的人都有

豆豆～UID: 2378384

俺不bt>_<

zhoushengyuanlyUID: 2246479

;d:  I know...

深海lavenderUID: 2350207

;P