Some interesting posters @ SfN

20 11 2008

Here’s a few posters that caught my eye at SfN.  Click the meeting planner for the full abstract

Optimizing two-photon activation of channelrhodopsin-2 for stimulation at cellular resolution

J. P. RICKGAUER1,2, D. W. TANK1,2

Spiral pattern of 2-photon excitation can drive neurons to spike.  A low NA objective helps. Need to do piezo-based Z-scanning if you use high NA, don’t with low NA.

In vivo two-photon imaging 1 mm deep into cortical brain tissue with novel microprism probe 

*T. H. CHIA, M. J. LEVENE; 

A cute method to image 1mm into cortex with 2-photon imaging. They used 2-6 month old mice. The just took a triangular prism whose hypotenuse was silvered and stuck it in the cortex. Then they internally reflected the beam off the prism and fired it sideways into cortex. Got good SNR to 300um lateral distance.  Some clippling of beam at edges of the prism gave somewhat inconsistent spatial resolution.

Self-complementary adeno-associated viral vectors for fast, efficient labeling of neurons and astrocytes in visual cortex in vivo

R. L. LOWERY1, Y. ZHANG2, C. LAMANTIA1, B. K. HARVEY3, A. K. MAJEWSKA1

AAV is the way to go for expression of GECIs and ChR2 in vivo, but it takes a long time to express at high levels (2 weeks). They show that using a double stranded DNA version of AAV rather than single stranded gets protein expression up high much faster. Very high expression after one week. This is because the virus doesn’t need to take the time to make the second strand before expressing the protein.  See Xiao, X J. Virol 1998

Detection of single action potentials in vitro and in vivo with genetically-encoded Ca2+ sensors

S. MEYER ZUM ALTEN BORGLOH1, D. J. WALLACE2, S. ASTORI3, Y. YANG3, M. BAUSEN3, S. KUGLER4, M. MANK5, O. GRIESBECK5, J. NAKAI6, A. MIYAWAKI6, A. E. PALMER7, R. Y. TSIEN7, R. SPRENGEL3, J. N. D. KERR2, W. DENK3, M. T. HASAN3

Everything in the poster was in the Nature Methods paper.  Conversation reveled that YC3.60 works as well or better than D3cpv. Only have done up to whisker evoked stimulation, no imaging of spontaneous YC3.60 signals yet.

Characterization of improved probes for the hybrid voltage sensor method of voltage imaging

D. WANG1, Z. ZHANG2, B. CHANDA1, M. B. JACKSON1

A nice little sensor optimization poster.  They took the hVOS hybrid voltage sensor of dipicrylamine with membrane tethered GFP and improved it by changing the chromophore to Cerulean, and by using the “membrane-staple” strategy. Having membrane anchors on both the N and C-termini gave better quenching. Fast response, ~0.5ms, and 20% dF/F.

Crystal structure of the genetically encoded calcium indicator gcamp2

*J. AKERBOOM1, L. TIAN1, S. VISWANATHAN1, S. A. HIRES1, J. S. MARVIN1, E. R. SCHREITER2, L. L. LOOGER1

Jasper made crystal structures of G-CaMP2 in the apo and bound states.  Bound states crystalized as a heterodimer, but he was able to also crystalize the monomer. The structures show a pore to the chromophore in the apo state that is plugged in the Ca-bound state. Thus, the quenched apo state is due to solvent access to the chromophore.  This structural data should help rational design of better G-CaMP sensors.


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SFN Neuroscience Picower MIT Party 2008

10 11 2008

Lots of people searching for “SFN MIT party” for this information in google… Here’s the answer you are looking for.  Right next to the convention center. Much more convenient than three years ago at Cobalt.  No excuse to be late…

Someone send me an invite to the Neuron, Nature and Emory parties, pretty please! 

 

Is that a man in a tuxedo wearing stilts?

Is that a man in a tuxedo wearing stilts?

 

 

The Picower Institute, The McGovern Institute, and the Department of Brain and Cognitive Sciences at MIT

Invite you to the sixth annual party at the 2008 meeting of the Society for Neuroscience

Monday, November 17th, 2008  

9pm – 2am  

Avenue Nightclub
649 New York Ave NW

Washington, DC





UCSD vs. MIT SFN Party Smackdown

3 11 2007

The Society for Neuroscience conference starts today in America’s Finest City (San Diego). The question on everyone’s mind is, who is going to throw the best party? Sure there are plenty of themed mixers and socials, but few really stay interesting for long.

The past few years, the Picower Center for Learning and Memory at MIT has consistently had the biggest bash, really peaking in 2006 at the eye-popping Atlanta mega-club Compound. With a big open bar tab that unfortunately gets drained within an hour, and an open invitation, these are always packed with people early on, go strong till last call, and feature plenty of Neuroscience ‘star power’. This year, the party starts Monday at 9pm at Deco’s on 5th Ave. in the Gaslamp. Get there early, as Deco’s is a relatively small place.

Nature and Neuron each throw lower-key parties, with the best hors d’oeuvres and are definitely the place to do serious science/business networking. Security is pretty loose, as long as you let the door know that you know that the party is for Nature or Neuron. When and where these parties might be in San Diego is under intense investigation by BrainWindows staff.

The most exclusive of all are the mysterious Emory parties, where you better bring the printout of your personalized invitation email if you want to get in.

This year, there is a new group that is trying to dethrone the PCLM as hosts of the biggest event. UCSD Neurosciences is hosting an open-invite, open-bar event this Sunday at Aubergine, at 4th & Island in the Gaslamp. The bar tab opens at 9pm, and if the PCLM parties are any guide, I would get there at 9. Bring friends!

UCSD Neurosciences Party

Who will impress the community the most? PCLM has a five year reputation, and the experience of Earl Miller and Susumu Tonegawa behind it. But UCSD knows San Diego, and it’s grad-student run social committee has held numerous, very successful local events. As a soon-to-be alum of both UCSD and PCLM, I’m looking forward to finding out who does it best. See you there!