久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

USEUROPEAFRICAASIA 中文雙語(yǔ)Fran?ais
Lifestyle
Home / Lifestyle / Health

New study offers tips for growing artificial skin

Xinhua | Updated: 2017-07-24 11:37

New research at the University of California, Berkeley, indicates that the rubber-like elasticity of skin, which contracts to its original shape after being stretched, is key to the development of regularly spaced hairs and sweat glands during development.

The findings, published in a recent issue of Science, come from experiments on how chicken skin generates feathers as the embryo develops inside the egg. They could provide tips on how to grow artificial skin for grafts that looks like normal human skin, complete with hair follicles and sweat pores.

The research, according to the researchers, is the first to link the gentle tug of war among cells as an organism grows to the specific genes that turn on to make cells differentiate into different cell types, turning a generic skin cell, for example, into a specialized follicle cell and eventually a feather.

"The cells of the skin in the embryo are pulling on each other and eventually pull one another into little piles that each go on to become a follicle," said Amy Shyer, a postdoctoral fellow in the UC Berkeley Department of Molecular and Cell Biology.

"What is really key is that there isn't a particular genetic program that sets up this pattern. All of these cells are initially the same and they have the same genetic program, but their mechanical behavior produces a difference in the piled-up cells that flips a switch, forming a pattern of follicles in the skin."

In the study, as first authors, Shyer and Alan Rodrigues, an independent biologist and former UC Berkeley visiting scholar, tested different types of materials on which to grow skin taken from week-old chicken eggs, using artificial substrates that mimic the stiffness of tissues that underlie the skin in the bird.

The skin was obtained from chicken embryos at a time in their development analogous to about one month of gestation in humans, a point at which the human embryo looks the most like other animals, ranging from chickens and turtles to mice and humans, Shyer said.

This is also the point where the rough outlines of internal organs start to differentiate and look like, for example, a heart, lung or liver.

Previous 1 2 Next

Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
主站蜘蛛池模板: 怡红院免费全部视频在线视频 | 国产精品高清在线观看地址 | 国产99精品一区二区三区免费 | 九九热精品在线 | 国产在线a不卡免费视频 | 色网站在线| 国产素人在线观看 | 色视频网站大全免费 | 免费网站看v片在线香蕉 | 99精品国产综合久久久久 | 欧美xxxxxxxx| 国产欧美视频综合二区 | 波多野结衣在线视频观看 | 久久精品三级视频 | 日本韩国一级毛片中文字幕 | 人成精品视频三区二区一区 | 99视频在线免费看 | 亚洲自拍高清 | 在线免费成人 | 欧美亚洲国产成人高清在线 | 三级黄色网址 | 国产精品私人玩物在线观看 | 91成人国产网站在线观看 | 怡红院在线观看 | 亚洲国产一区二区三区四区五区 | 国产精品v免费视频 | 成人三级做爰在线视频 | 国产系列在线播放 | 国产综合13p| 亚洲精品中文字幕一区 | 91视频国内 | 欧美一级做一级爱a做片性 欧美一欧美一级毛片 | 免费色网址 | 日韩高清欧美 | 1a级毛片免费观看 | japanese乱子另类 | 亚洲欧美综合久久 | 中文字幕乱码在线观看 | 欧美一级毛片免费大片 | 欧美一级在线观看播放 | 成人老司机深夜福利久久 |