Brain Repair (in Mice; Not G.O.P.-ready) November 25, 2011
Posted by stuffilikenet in Awesome, Brain, Science, Uncategorizable.add a comment
Harvard scientists have performed a neuron transplant into mice with malfunctioning hypothalamuses (hypothalami??). The mice formerly could not respond to leptin, the signal of fullness, and were consequently little porkers (“morbidly obese”, in geekspeak). The neuron transplants repaired defective brain circuits, enabling them to respond to leptin and thus experience substantially less weight gain. The treated mice grew to approximately 30 percent less than their untreated siblings or siblings treated in other ways. This resulted in a nice paper in Science1 and a slap on the forhead for most everyone who thinks neuronal repair in the brain is impossible—which was nearly everyone, I guess, including me, although I will confess that the nature of brain plasticity is an area which has always required more research.
"The next step for us is to ask parallel questions of other parts of the brain and spinal cord, those involved in ALS and with spinal cord injuries," Jeffrey Macklis, Harvard University professor of stem cell and regenerative biology and HMS professor of neurology at Massachusetts General Hospital, and one of three corresponding authors on the paper said. "In these cases, can we rebuild circuitry in the mammalian brain? I suspect that we can."
I am leaving out the nifty science they did to monitor this pretty amazing and heretofore-considered-mad-science science, but it’s pretty damn good, too. it seems like there’s a whole lot going on in science right now that demands an open mind and a hell of a lot of work.
So get busy, you guys.
1 "Transplanted Hypothalamic Neurons Restore Leptin Signaling and Ameliorate Obesity in db/db Mice" by Czupryn et al. Science, Vol. 334 (6059), November 25, 2011.
They’ll Take Over, Just Wait November 25, 2011
Posted by stuffilikenet in Awesome, Octopus, Video.add a comment
Graphene Ink Printing of Electronic Components November 25, 2011
Posted by stuffilikenet in 3D Printing, Awesome, Science, Toys.add a comment
Using ink-jet printer nozzles for any number of fine fabrication techniques is already underway and under research, but Professor of Nanotechnology Andrea Ferrari and colleagues from the Engineering Department at the University of Cambridge have developed a method of creating a graphene ink that can be used with a modified ink-jet printer. This is revolutionary for two reasons: first, electronic components such as thin film transistors (TFTs) can already be created using ink-jet printing with ferroelectric polymer inks, but the performance of such components is poor and they are too slow for many applications. Graphene-enhanced versions of these transistors are much, much faster and have higher electron motilities. Second, the resulting components can be transparently printed on a number of flexible substrates. Essentially, the moving, flexible folding newspaper from Harry Potter films (and any number of science fiction stories) can be fabricated with a system of these graphene-ink-printed components.
Using flakes of pure graphite, the team peeled off layers of graphene using liquid-phase exfoliation (sonication of the graphite in the presence of a solvent). The graphene bits were ultra-centrifuged and filtered to remove any particles large enough to block the ink-jet printer heads (about a micron). These processed graphene bits were then used as the basis for the ink printed, using a more-or-less standard ink-jet printer, onto silicon and glass. They heated the substrates to drive off the ink carrier, leaving the graphene flakes behind. The results are at least comparable to current ferroelectric polymer inks:
“They achieved mobilities of up to around 95cm2V−1s−1, about 80% transmittance and 30kohm sheet resistance. Non-graphene polymer inks typically achieve mobilities of less than 0.5cm2V−1s−1, while adding carbon nanotubes can increase this to around 50cm2V−1s−1.”
The results should only improve as the method is refined and enhanced. I imagine that any number of display manufacturers would be interested in this method, if only to print touchscreens directly on their current displays cheaply.
I predict a burgeoning movement among the various hobbyists who specialize in printer hacks a la RepRap. People like Jeri Ellsworth have been working on home-made electronics (specifically in her case transistors) and will be very, very interested in what sounds like an easily-reproduced inkjet solution for printing small electronic components.
Ink-Jet Printed Graphene Electronics, F. Torrisi, T. Hasan, W. Wu, Z. Sun, A. Lombardo, T. Kulmala, G. W. Hshieh, S. J. Jung, F. Bonaccorso, P. J. Paul, D. P. Chu, A. C. Ferrari arXiv:1111.4970v1
Excellent Hack Using attiny85 November 25, 2011
Posted by stuffilikenet in Awesome, Geek Stuff, Toys.add a comment
Producing stereo piezo sound, this minimalist greeting-card music player garnered a LOT of comments when posted at hackaday.com. My favorite:
‘This could be used to hack musical cards a la the Barbie Liberation Front: http://sniggle.net/barbie.php.
What could be better than a “Congratulations on your wedding” card that played Highway to Hell!’
Reamde by Neal Stephenson November 24, 2011
Posted by stuffilikenet in Books, Brilliant words.add a comment
A damned good book which held my interest despite being filled with reality-simulating levels of detail, Reamde
Like many of his novels, Reamde is real enough that it might well have happened, or might happen tomorrow (see also The Baroque Cycle
In Audible’s amazingly bad way, the very-cheap-for-them-to-deliver version is more expensive than the expensive-to-manufacture-and-mail version on CD, at least on Amazon Prime. Idiots.
Jonathan Strange and Mr. Norrell November 24, 2011
Posted by stuffilikenet in Books, Brilliant words.1 comment so far
Jonathan Strange & Mr. Norrell by Susanna Clarke
Anyway, the windup to this story is about the juxtaposition of two magicians and their faery servants fighting more or less alongside England’s army/navy against Napoleon until their clash of styles reveals rather different motivations in each, leading to a wider war than merely all of Europe.
Very different from The Armor of Light, the last historical-cum-fantasy story I reviewed, or The Hundred Thousand Kingdoms which is in a glorious class by itself.
Movie Monster-sized Amoeba From an Icy Hell November 22, 2011
Posted by stuffilikenet in Mutants, Science.add a comment
Protoazoa are usually about 10-52 microns across, but not the Xenophyophores of the Mariana Trench—the largest individual cells in existence. These guys reach four inches across, live in large numbers oozing along the ocean floor (six miles deep!) and eat the sediments collecting there, building up the best defense in the world: huge concentrations of toxic metals. They ooze along on pseudopodia and slime, just like a 1950’s movie monster.
See? Reality is weirder than you imagine. And can imagine.
Night-blooming Orchid!! November 22, 2011
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This little beauty, Bulbophyllum nocturnum, is found on the island of New Britain near Papua New Guinea. It has flowers that consistently open after dark and close in the morning, the only one with those characteristics amongst the 25,000 orchid species known to science.
Only open for business from 10pm to 10am, these blooms wither immediately after opening…once. Kew Gardens speculates they are pollinated by midges, but this is still under study.
Flamboyant Cuttlefish—New Boy Band? November 20, 2011
Posted by stuffilikenet in Awesome, Octopus, Science, Video.add a comment
Well, they couldn’t flame more than the Backstreet Boys.
Pfeffer’s Flamboyant Cuttlefish (Metasepia pfefferi), is found in the South Pacific. It is also psychedelic as hell. Watch this video with a Pink Floyd soundtrack, not whatever the hell this is.
Cuttlefish are cephalopods, too, hence the Octopus tag.
