標題: [自然百科] 動物胚胎 [打印本頁]
作者: vandas 時間: 2012-8-26 05:33 AM 標題: 動物胚胎
Wombs with a view: Revolutionary four-dimensional imaging reveals spectacular photos of mammal embryos that already look just like mum
By Daily Mail Reporter
They may grow to be very different beasts, but these breathtaking images reveal how surprisingly similar the beginning of life can be for the animal kingdom.
Captured ]using revolutionary four-dimensional scanning technology, scientists have managed to shed light on the world of mammals inside the womb.
As diverse a bunch as they are - elephant, dog, dolphin and penguin are all shown united by their similar stages of development.
An Asian elephant foetus after 12 months in the womb, catching some shut eye before she takes her first heavy steps in the world in just under a year's time. The gestation period for an elephant is 22 months
Paw-sing for thought: With tiny paws poised an unborn puppy looks already set to pounce as he reaches his full gestation period of around nine weeks
Say cheese: A baby dolphin seems to be smiling for the camera as he prepares for his big splash
Using revolutionary four-dimensional scanning technology, scientists have captured the images for a National Geographic Documentary called 'Extraordinary Animals in the Womb'.
They were captured by using a combination of three-dimensional ultrasound scans, computer graphics and small cameras to document the animals’ development from conception to birth, and give an unparalleled glimpse into a world that few of us would ever expect to see.
The images were also used on a Channel 4 documentary 'Animals in the Womb'.
The documentary explores the marked similarities between very different animals.
Sleepy?: A dog foetus could be mistaken for a fat in these ground breaking images. The animals - as diverse as they are - strike remarkably similar poses in the womb
Snug as a bug: A penguin curls up in it's mothers womb. The gestation period lasts about 63 days. The females then lay the egg and pass it on to the male penguin while they go off to feed.
A baby kangaroo in its mother's pouch, where it will stay for six months before it hops into the world
An Emperor penguin chick embryo inside its egg after about one week's gestation
This baby kitten is just a week away from being born
A cocooned parasitic wasp larva beginning to morph into adult form
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作者: vandas 時間: 2012-8-26 05:45 AM
據美國《國家地理》雜志報道，動物胚胎是如何形成的？科學家發現，為了發育成為復雜有機體，一個胚胎細胞必須分裂，然后在體內游走並形成錯綜復雜的形狀和特定的組織。以下是科學家運用高科技手段實現曝光的四大動物胚胎。
1、帝企鵝在蛋裡 一呼一吸
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在艱辛孵化結束前的幾天裡，最后要破殼而出的帝企鵝在蛋裡安心地一呼一吸。通常孵化的蛋位於帝企鵝爸爸的腳下，而帝企鵝媽媽則處於長達數月的捕魚征途之中。不像人類胚胎的發育，企鵝寶寶不能從媽媽的血液中獲得氧氣。相反，它們的臍帶連著企鵝蛋內壁上一層膜中的血管，氧氣通過蛋殼的微小氣孔進入企鵝胚胎的血液中。64天后，帝企鵝寶寶開始慢慢破殼而出。幸運的話，媽媽則在一邊等待給它們喂魚吃呢。
2、寄生蜂 - 地球上的外來客
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在此紗一樣薄的仿真數字模擬影像中，寄生蜂胚胎看起來非常平靜，但1979年發行的恐怖片《異形（Alien）》則制造了著名的“誕生”場面。寄生蜂卵被其媽媽注入到毛虫體內，經過14天的發育，寄生蜂卵就開始其“陰險”行動了。在動物王國獨有的生物學攻擊中，這種暗中下手的胚胎在它們的DNA中利用病毒來麻痺其寄主。它們咬破毛虫鑽出毛虫身體，接著就開始織繭。當最后的冒險出現在受傷寄主毛虫身上時，毛虫顯然是被病毒弄糊涂了，它們為其攻擊者建造柔軟的絲毯，以保護它們不受捕食者的攻擊，直到寄生蜂完全長成並飛到天空為止。
3、檸檬鯊胚胎以卵黃囊為食
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在此電腦制作的檸檬鯊懷孕的仿真影像中，像人類胚胎一樣，檸檬鯊胚胎也通過臍帶和媽媽的胎盤相連。然而，檸檬鯊懷孕不總是和人類一樣。檸檬鯊胚胎要發育 12個月才算足月，且當它們在子宮裡懷孕大約三個月時，它們以卵黃囊為食。它們一旦消耗完卵黃囊，塌陷的卵黃囊就會停靠在子宮壁上，將其血管射入子宮壁，從此利用檸檬鯊媽媽的血液循環。當檸檬鯊胚胎6個月大時，其嗅覺能力是人類胚胎的一萬倍。其它感官能力包括對電的敏感度也非常靈敏。這種能力讓它們能發現其它動物的微弱電壓，有一天將會讓此鯊魚能探測到幾百英尺之外在水中拍打的魚鰭。
4、紅色袋鼠寶寶：從體內到體外
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這隻小小的紅色袋鼠寶寶有一天會長成人一樣大的動物。但現在這隻數周大的袋鼠寶寶隻有櫻桃一般大，成了子宮外的一個袋鼠胎兒。小袋鼠出生時非常柔弱，身長僅2厘米，全身粉紅色，閉眼無毛，但是它必須靠自己的力量艱難地從母體的出生口經過體外向上爬行，能最終爬進育嬰袋的才能存活。不過，紅色袋鼠進化出了適應這種艱難妊娠的本領，甚至在此懷孕初期，此紅色袋鼠寶寶的前臂具備了全面的能力，內耳也能區分上下，其靈敏的鼻子能代替還沒有露出來的眼睛，更好地發現並含住媽媽微小的奶頭，一直在媽媽育嬰袋裡吃上6個月的奶才能完全離開育嬰袋。
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Emperor penguin
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puppy
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Lemon Shark
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Elephant
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Wolf
作者: 果鲁鲁 時間: 2012-8-26 08:28 AM
真是長見識。版主這個帖子太精彩了。也給自己來個大拇指才是嘛~
非常感謝您的分享~
作者: nuggetsiverson 時間: 2012-8-27 04:52 PM
小小的看起來非常愛啊.
作者: klamb 時間: 2013-12-17 07:29 AM 標題: 動物胚胎照片和紀錄片
本帖最後由 klamb 於 2013-12-17 10:48 AM 編輯
在當年 (2006年)
一組驚人動物胚胎照片和紀錄片,有海豚，鯊魚，狗，企鵝，貓和大象
節目的製片人Peter Chinn,使用3D超聲波掃描，電腦圖形和微型攝像機的組合來捕捉過程,從受孕到誕生,這是他們見過的最詳細的胚胎的動物圖片。
These amazing embryonic animal photographs of dolphins, sharks, dogs, penguins, cats and elephants are from a new National Geographic Documentary called “Extraordinary Animals in the Womb”.
The show’s producer, Peter Chinn, used a combination of three-dimensional ultrasound scans, computer graphics and tiny cameras to capture the process from conception to birth.
They are the most detailed embryonic animal pictures ever seen.
胚胎約一個星期後的皇帝企鵝
An Emperor penguin chick embryo inside its egg after about one week's gestation
一些胚胎的動物
混合動物
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人類---
有些畫面不適合一些人(令人感覺不舒服)，請自行到此網站瀏覽（長1小時30分鐘）
National Geographic In the Womb - YouTube
作者: 麵包和牛奶 時間: 2013-12-17 03:32 PM
小海豚好可爱哦···
作者: shawn2222 時間: 2015-1-19 07:19 PM
拍的很精彩
真的大開眼界了
感謝分享
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