In the current issue of the Journal of Neuroscience, Johns Hopkins researchers report that injection of human stem cells into the fluid around the spinal cord of each of 15 paralyzed rats clearly improved the animals ability to control their hind limbs -- but not at all in the way the scientists had expected.
"Our first hypothesis was that functional recovery came from human cells reconstituting the nerve circuits destroyed by the paralysis-inducing virus we gave the rats," says first author Douglas Kerr, M.D., Ph.D., assistant professor of neurology at the Johns Hopkins School of Medicine. "Some of the tens of thousands of implanted primitive human stem cells did become nerve cells or the like, but not enough to account for the physical improvements.
"Instead, these human embryonic germ cells create an environment that protects and helps existing rat neurons -- teetering on the brink of death -- to survive," he says.
Malaria Already Endemic in the Mediterranean by the Roman Period
27.07.2017 | Universität Zürich
Serious children’s infections also spreading in Switzerland
26.07.2017 | Universitätsspital Bern
Spectrally narrow x-ray pulses may be “sharpened” by purely mechanical means. This sounds surprisingly, but a team of theoretical and experimental physicists developed and realized such a method. It is based on fast motions, precisely synchronized with the pulses, of a target interacting with the x-ray light. Thereby, photons are redistributed within the x-ray pulse to the desired spectral region.
A team of theoretical physicists from the MPI for Nuclear Physics (MPIK) in Heidelberg has developed a novel method to intensify the spectrally broad x-ray...
Physicists working with researcher Oriol Romero-Isart devised a new simple scheme to theoretically generate arbitrarily short and focused electromagnetic fields. This new tool could be used for precise sensing and in microscopy.
Microwaves, heat radiation, light and X-radiation are examples for electromagnetic waves. Many applications require to focus the electromagnetic fields to...
Strong light-matter coupling in these semiconducting tubes may hold the key to electrically pumped lasers
Light-matter quasi-particles can be generated electrically in semiconducting carbon nanotubes. Material scientists and physicists from Heidelberg University...
Fraunhofer IPA has developed a proximity sensor made from silicone and carbon nanotubes (CNT) which detects objects and determines their position. The materials and printing process used mean that the sensor is extremely flexible, economical and can be used for large surfaces. Industry and research partners can use and further develop this innovation straight away.
At first glance, the proximity sensor appears to be nothing special: a thin, elastic layer of silicone onto which black square surfaces are printed, but these...
3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects
A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...
26.07.2017 | Event News
21.07.2017 | Event News
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28.07.2017 | Life Sciences
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28.07.2017 | Physics and Astronomy