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Finally, Having PD is gonna be an enlightening experience...;-)
Nic 56/14
On Fri, Feb 27, 2009 at 4:36 AM, rayilynlee <[log in to unmask]> wrote:
> Nanoparticles let scientists tickle brain cells wirelessly
> Last Updated: Wednesday, February 25, 2009 | 6:45 PM ET
> CBC News
> Using electrical signals to stimulate brain and nerve cells can help people
> recover from injury and improve the lives of those with Parkinson's disease,
> but often requires the surgical implantation of electrodes in the brain,
> which are attached to cumbersome wires.
> A group of scientists in Cleveland, Ohio, has now found a new method that
> could one day allow doctors to activate neurons - brain or nerve cells -
> wirelessly using microscopic beads and light.
> So far, Case Western Reserve University neuroscientist Ben Strowbridge,
> chemist Clemens Burda, and members of their research groups have tried their
> technique on slices of rat brain tissue and published the results in a
> recent issue of the journal Angewandte Chemie.
> The method involves placing beads about 10 nanometres wide - far smaller
> than human cells - close to a neuron. A human hair is about 80,000
> nanometres wide.
> The beads are made of semiconductors that get electrically excited when
> light shines on them.
> "Essentially, these are the same particles used to sensitize solar cells,"
> Burda said.
> The illuminated particles produce an electric field or current that
> activates the neurons, which respond with their own measurable electrical
> signals.
> In Strowbridge and Burda's experiments, the nanoparticles were attached to
> a very small glass micropipette to make it easier to position the particles,
> but ultimately the researchers hope to be able to place a layer of particles
> on the brain.
> The technique has a number of advantages over current methods to
> electrically stimulate the brain, Strowbridge said.
> Current methods involve surgery, a much larger metal electrode, typically
> one with a contact about one millimetre - one million nanometres - in
> diameter. It is hooked up to wires that come out of the brain or skin and
> are attached to a control unit.
> "It's very invasive and the wires themselves are difficult to deal with,"
> Strowbridge said. In addition, current methods involve stimulation at only
> one or two sites at a time.
> With a layer of nanoparticles, the light, and therefore the activation,
> could be directed to different areas.
> "There's really no other technology that can do that with this degree of
> control or spatial resolution."
> If the nanoparticles were placed near the surface of the skin, it is
> possible that they could be activated by shining a light through the skin.
> Otherwise, a fibre optic cable could be used to deliver the light.
> Strowbridge and Burda chose to use very small particles in an effort to
> make them as uninvasive as possible. Ultimately, they plan to coat them with
> a biocompatible glass to ensure they are non-toxic.
> The technique still needs to be refined and tested on actual rat brains and
> nerves before it can be applied to humans.
>
> Related
> Internal Links
>
> Deep brain stimulation could help memory loss: study
> Magnetic stimulator aims to treat depression patients
> Nerve stimulation may help treat cluster headaches
> Electrical stimulation promising option for Parkinson's
>
> Rayilyn Brown
> Director AZNPF
> Arizona Chapter National Parkinson Foundation
> [log in to unmask]
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December 1996, Week 3 December 1996, Week 2 December 1996, Week 1 November 1996, Week 5 November 1996, Week 4 November 1996, Week 3 November 1996, Week 2 November 1996, Week 1 October 1996, Week 5 October 1996, Week 4 October 1996, Week 3 October 1996, Week 2 October 1996, Week 1 September 1996, Week 5 September 1996, Week 4 September 1996, Week 3 September 1996, Week 2 September 1996, Week 1 August 1996, Week 5 August 1996, Week 4 August 1996, Week 3 August 1996, Week 2 August 1996, Week 1 July 1996, Week 5 July 1996, Week 4 July 1996, Week 3 July 1996, Week 2 July 1996, Week 1 June 1996, Week 5 June 1996, Week 4 June 1996, Week 3 June 1996, Week 2 June 1996, Week 1 May 1996, Week 5 May 1996, Week 4 May 1996, Week 3 May 1996, Week 2 May 1996, Week 1 April 1996, Week 5 April 1996, Week 4 April 1996, Week 3 April 1996, Week 2 April 1996, Week 1 March 1996, Week 5 March 1996, Week 4 March 1996, Week 3 March 1996, Week 2 March 1996, Week 1 February 1996, Week 5 February 1996, Week 4 February 1996, Week 3 February 1996, Week 2 February 1996, Week 1 January 1996, Week 5 January 1996, Week 4 January 1996, Week 3 January 1996, Week 2 January 1996, Week 1 December 1995, Week 5 December 1995, Week 4 December 1995, Week 3 December 1995, Week 2 December 1995, Week 1 November 1995, Week 5 November 1995, Week 4 November 1995, Week 3 November 1995, Week 2 November 1995, Week 1 October 1995, Week 5 October 1995, Week 4 October 1995, Week 3 October 1995, Week 2 October 1995, Week 1 September 1995, Week 5 September 1995, Week 4 September 1995, Week 3 September 1995, Week 2 September 1995, Week 1 August 1995, Week 5 August 1995, Week 4 August 1995, Week 3 August 1995, Week 2 August 1995, Week 1 July 1995, Week 5 July 1995, Week 4 July 1995, Week 3 July 1995, Week 2 July 1995, Week 1 June 1995, Week 5 June 1995, Week 4 June 1995, Week 3 June 1995, Week 2 June 1995, Week 1 May 1995, Week 5 May 1995, Week 4 May 1995, Week 3 May 1995, Week 2 May 1995, Week 1 April 1995, Week 5 April 1995, Week 4 April 1995, Week 3 April 1995, Week 2 April 1995, Week 1 March 1995, Week 5 March 1995, Week 4 March 1995, Week 3 March 1995, Week 2 March 1995, Week 1 February 1995, Week 4 February 1995, Week 3 February 1995, Week 2 February 1995, Week 1 January 1995, Week 5 January 1995, Week 4 January 1995, Week 3 January 1995, Week 2 January 1995, Week 1 December 1994, Week 5 December 1994, Week 4 December 1994, Week 3 December 1994, Week 2 December 1994, Week 1 November 1994, Week 5 November 1994, Week 4 November 1994, Week 3 November 1994, Week 2 November 1994, Week 1 October 1994, Week 5 October 1994, Week 4 October 1994, Week 3 October 1994, Week 2 October 1994, Week 1 September 1994, Week 5 September 1994, Week 4 September 1994, Week 3 September 1994, Week 2 September 1994, Week 1 August 1994, Week 5 August 1994, Week 4 August 1994, Week 3 August 1994, Week 2 August 1994, Week 1 July 1994, Week 5 July 1994, Week 4 July 1994, Week 3 July 1994, Week 2 July 1994, Week 1 June 1994, Week 5 June 1994, Week 4 June 1994, Week 3 June 1994, Week 2 June 1994, Week 1 May 1994, Week 5 May 1994, Week 4 May 1994, Week 3 May 1994, Week 2 May 1994, Week 1 April 1994, Week 5 April 1994, Week 4 April 1994, Week 3 April 1994, Week 2 April 1994, Week 1 March 1994, Week 5 March 1994, Week 4 March 1994, Week 3 March 1994, Week 2 March 1994, Week 1 February 1994, Week 4 February 1994, Week 3 February 1994, Week 2 February 1994, Week 1 February 1994 January 1994 December 1993 November 1993
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