S*********b
发帖数: 180 | | S*********b
发帖数: 180 | 2 http://www.huffingtonpost.com/2012/09/27/carnivorous-plant-sund
Many carnivorous plants snag prey by luring them onto sticky surfaces from
which there is no escape. But a common sundew (Drosera glanduligera) from
southern Australia packs a one-two punch. The edges of its spoon-shaped
leaves are ringed with up to 18 6-millimeter-long "tentacles" that can move
four times faster than the blink of an eye; when an ant or other small
insect touches a tentacle, it flicks the unsuspecting insect into the center
of the leaf. There, another set of tentacles covered with glue draws the
ant deep into the fold of the leaf where it is digested, researchers report
today online in PLoS ONE. Just one researcher had observed this catapulting
motion in the wild, and only now has it been demonstrated in the lab. The
team raised sundews in a greenhouse, feeding the young plants fish flakes
and, once the plants got big enough, dead fruit flies. When the plants were
mature, the researchers filmed the plant's reactions to live insect visitors
. They also tripped isolated tentacles with nylon thread while filming them
under a microscope to see close-up how they worked. When activated, the
tentacle bends at a hinge near its base; in as few as 75 milliseconds (an
eye blink takes about 350 milliseconds) it catapults toward the leaf's
center. It's not clear what drives this motion, but once flung, the tentacle
can't unwind and be used again, the researchers report. Fortunately,
sundews produce new leaves every few days, so there's always a fresh set of
traps for unsuspecting prey. | i*****s
发帖数: 15215 | 3 可以养一些在家里
【在 S*********b 的大作中提到】
: http://www.huffingtonpost.com/2012/09/27/carnivorous-plant-sund
: Many carnivorous plants snag prey by luring them onto sticky surfaces from
: which there is no escape. But a common sundew (Drosera glanduligera) from
: southern Australia packs a one-two punch. The edges of its spoon-shaped
: leaves are ringed with up to 18 6-millimeter-long "tentacles" that can move
: four times faster than the blink of an eye; when an ant or other small
: insect touches a tentacle, it flicks the unsuspecting insect into the center
: of the leaf. There, another set of tentacles covered with glue draws the
: ant deep into the fold of the leaf where it is digested, researchers report
: today online in PLoS ONE. Just one researcher had observed this catapulting
| y**u
发帖数: 7459 | 4 和蜘蛛争食吃
【在 i*****s 的大作中提到】
: 可以养一些在家里
| y**u
发帖数: 7459 | 5 换新衣服啦
【在 S*********b 的大作中提到】
: http://www.huffingtonpost.com/2012/09/27/carnivorous-plant-sund
: Many carnivorous plants snag prey by luring them onto sticky surfaces from
: which there is no escape. But a common sundew (Drosera glanduligera) from
: southern Australia packs a one-two punch. The edges of its spoon-shaped
: leaves are ringed with up to 18 6-millimeter-long "tentacles" that can move
: four times faster than the blink of an eye; when an ant or other small
: insect touches a tentacle, it flicks the unsuspecting insect into the center
: of the leaf. There, another set of tentacles covered with glue draws the
: ant deep into the fold of the leaf where it is digested, researchers report
: today online in PLoS ONE. Just one researcher had observed this catapulting
| S*********b
发帖数: 180 | 6 another majia
【在 y**u 的大作中提到】
: 换新衣服啦
| n*2
发帖数: 19062 | 7 hah
【在 S*********b 的大作中提到】
: another majia
| a***a
发帖数: 12425 | 8 就把你编号为#930。
【在 S*********b 的大作中提到】
: http://www.huffingtonpost.com/2012/09/27/carnivorous-plant-sund
: Many carnivorous plants snag prey by luring them onto sticky surfaces from
: which there is no escape. But a common sundew (Drosera glanduligera) from
: southern Australia packs a one-two punch. The edges of its spoon-shaped
: leaves are ringed with up to 18 6-millimeter-long "tentacles" that can move
: four times faster than the blink of an eye; when an ant or other small
: insect touches a tentacle, it flicks the unsuspecting insect into the center
: of the leaf. There, another set of tentacles covered with glue draws the
: ant deep into the fold of the leaf where it is digested, researchers report
: today online in PLoS ONE. Just one researcher had observed this catapulting
| I***i
发帖数: 14557 | 9 对，以第一天露面的日期为准。
【在 a***a 的大作中提到】
: 就把你编号为#930。
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