Tag Archives: Shana Kelley

University of Toronto researchers publish on quantum dots and ‘artificial molecules’

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Professors Shana Kelley and Ted Sargent (he was last mentioned in my June 28, 2011 posting on colloidal quantum dots) have published their findings on quantum dots, self-assembly, and luninescence in Nature Nanotechnology. From the July 10, 2011 news item on Nanowerk,

“Nanotechnologists have for many years been captivated by quantum dots – particles of semiconductor that can absorb and emit light efficiently, and at custom-chosen wavelengths,” explained co-author Kelley, a Professor at the Leslie Dan Faculty of Pharmacy, the Department of Biochemistry in the Faculty of Medicine, and the Department of Chemistry in the Faculty of Arts & Science. “What the community has lacked – until now – is a strategy to build higher-order structures, or complexes, out of multiple different types of quantum dots. This discovery fills that gap.”

The team combined its expertise in DNA and in semiconductors to invent a generalized strategy to bind certain classes of nanoparticles to one another.

“The credit for this remarkable result actually goes to DNA: its high degree of specificity – its willingness to bind only to a complementary sequence – enabled us to build rationally-engineered, designer structures out of nanomaterials,” said Sargent, a Professor in The Edward S. Rogers Sr. Department of Electrical & Computer Engineering at the University of Toronto, who is also the Canada Research Chair in Nanotechnology. “The amazing thing is that our antennas built themselves – we coated different classes of nanoparticles with selected sequences of DNA, combined the different families in one beaker, and nature took its course. The result is a beautiful new set of self-assembled materials with exciting properties.”

For anyone who can get past Nature Nanotechnology’s paywall, the article is titled, “DNA-based programming of quantum dot valency, self-assembly and luminescence”, and it was released on July 10, 2011.

Canadian Space Agency funds nanomedicine?

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I suppose it’s ignorance but I can’t quite fathom why the Canadian Space Agency (CSA) [ETA March 17, 2011: Corrected the mane of the Agency from Canada Space Agency to Canadian Space Agency] is partnering with the Canadian Institutes of Health Research (CIHR) to fund nanomedicine. I don’t understand how that fits into the CSA’s mandate. The March 16, 2011 news item on Nanowerk doesn’t answer my questions,

Research on nanomedicine and regenerative medicine is designed to prevent disease and improve human health. Nanomedicine delivers medical technologies that detect or function at the molecular level to diagnose and treat disease, while regenerative medicine stimulates the renewal of bodily tissues and organs or restores function through natural and bioengineered means. Various innovations in these areas have helped combat vascular diseases, cancer, diabetes, multiple sclerosis and other chronic diseases. By promoting research in these areas, CIHR and CSA will be moving Canada to the forefront of modern medical research. [emphasis mine]

When was the Space Agency mandated to bring Canada to the “forefront of modern medical research?” I did look at the projects to see if any of them might have a ‘space travel’ component,

This funding will enable researchers to potentially:

# Identify microlesions in multiple sclerosis, using a new tool for quantifying the cause of the disease and how well a treatment is working, Dr. Daniel Côté, Université Laval;

# Create personalized nanomedicines that silence cancer-causing genes, Dr. P[ieter] Cullis, University of British Columbia;

# Develop microchip-based devices to analyze prostate cancer markers in blood, Dr. Shana Kelley, University of Toronto;

# Generate transplantable, insulin-producing cells from stem cells for diabetes, Dr. Timothy Kieffer, University of British Columbia;

# Develop innovative sensorimotor rehabilitation approaches for patients with spinal cord injuries or stroke, Dr. Serge Rossignol, Université de Montréal;

# Study how novel therapeutic interventions can regenerate blood vessels, Dr. Michael Sefton, University of Toronto; and,

# Develop nanotechnology-enabled image-guided methods of diagnosing and treating lung cancer and vascular diseases, Dr. Gang Zheng, University Health Network.

I suppose the project to regenerate blood vessels might have some applications appropriate for space travel/exploration but the rest leave me puzzled. If anyone has an answer or even a guess, please do leave a comment.

ETA March 17, 2011: I found the CSA’s mandate here,

The mandate of the Canadian Space Agency is:

To promote the peaceful use and development of space, to advance the knowledge of space through science and to ensure that space science and technology provide social and economic benefits for Canadians.