日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

Global EditionASIA 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
Share
Share - WeChat

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.

1 2 Next   >>|
Most Popular
Top
BACK TO THE TOP
English
Copyright 1994 - . 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: 超碰人人超碰 | 黄色大片视频网站 | 午夜私人影院在线观看 | 激情欧美日韩 | 一本到在线视频 | 中文字幕在线免费观看 | 朝桐光一区二区三区 | 亚洲精品久久久久久一区二区 | 黄色片成年人 | 国内精品久久久久久久久久 | 黄色片视频免费 | 亚洲第三区 | 天天狠狠 | 超碰精品在线 | 成人资源在线观看 | 欧美日韩中文字幕在线 | 亚洲成人欧美 | 4虎av | 97视频在线 | 成人黄色免费看 | 超碰在线免费播放 | 日本不卡久久 | 国产小视频网站 | 五月婷婷在线播放 | 古装做爰无遮挡三级视频 | 久久色资源网 | 免费欧美一级片 | 成人高清视频免费观看 | 日韩欧美大片在线观看 | 免费在线观看日韩av | 一级黄色淫片 | 91精品国产乱码久久 | 国产网友自拍 | av日日夜夜 | 秋霞不卡 | 深爱激情五月婷婷 | 亚洲成人福利视频 | 日韩色在线 | 五月天久久久久 | 一起艹在线观看 | 成年人黄网站 |