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quarta-feira, 2 de junho de 2010

Notícias

Células de Retina, criadas a partir de Células estaminais:

In another world first in the fight against degenerative eye disorders, scientists from the Universtiy of California, Irvine, have created an eight-layer early-stage retina from human embryonic stem cells. Not only is this the world's first three-dimensional complex tissue structure to be made from stem cells, but it also marks the first step toward the development of transplant-ready retinas to treat eye disorders affecting millions.
The retina is the part of the eye that records images and sends them from the eye to the brain via the optic nerve. Building on a process designed in a previous study, researchers created multiple cell types using microscopic gradients for solutions in which to bathe the stem cells and initiate specific differentiation paths.

Uma maneira simples de constuír órgãos em Laboratório, como se as Células fossem Legos!

Earlier this year we looked at a technique to grow 3D cell cultures using magnetic forces to levitate cells while they divided and grew, forming tissues that more closely resemble those inside the human body. Now researchers at the MIT-Harvard Division of Health Sciences and Technology (HST) have devised a new way to achieve the same goal by using "biological Legos".
Tissue engineering has long held promise for building new organs to replace damaged ones, like livers, or blood vessels and other body parts. However, one major obstacle is getting cells grown in a lab dish to form 3D shapes instead of flat layers. To overcome this problem the researchers have encapsulated living cells in cubes and arranged them into 3D structures, just as a child would construct buildings out of blocks.
http://www.gizmag.com/artificial-organs-biological-legos/15127/

...E um Helicóptero que ultrapassa os 208 Km/h!
Sikorsky Aircraft’s goal of producing the fastest helicopter ever built has taken another step towards becoming a reality. Its coaxial X2 Technology demonstrator has achieved a speed of 181 knots (208 mph) in a test flight – faster than the 160-170 knot speeds generally possible with conventional helicopters and edging closer to the eventual aim of delivering 250 knot (288 mph) cruising speeds.
As we’ve reported previously, the X2 demonstrator combines an integrated suite of technologies intended to advance the state-of-the-art, counter-rotating coaxial rotor helicopter. These include fly-by-wire flight controls, counter-rotating rigid rotor blades, hub drag reduction, active vibration control and an integrated auxiliary propulsion system.
After the latest test flight Jim Kaglis, Program Manager, Sikorsky Advanced Programs for Sikorsky, said, “the X2 Technology demonstrator today exceeded average helicopter speeds of a conventional helicopter, generally 160-170 knots.”

http://www.gizmag.com/sikorsky-x2-demonstrator-181-knots/15277/


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