An international team of physicists have been able to reconstruct the first ever 3-D image of individual virus particles by tweaking the X-ray diffraction technique of nanocrystallography1
Cleverly bypassing the tedious procedure of crystallizing individual particles, the researchers targeted the virus (Acanthamoeba polyphaga mimivirus) with high-energy pulses (70 fs duration) from an X-ray free electron laser. The X-rays scattered from the virus bodies, creating a 2D diffraction pattern.
Using 200 such different patterns and a mathematical algorithm to solve the problem of particle orientation, a single 3D electron density image was produced.
The XVI edition of Neutrino Telescopes is over and it is the time for some summing up – which I feel completely unsuited to do, as I was just an observer there. As you know, my field is high-energy collider physics, and neutrino physics has become a very different thing since the discovery of neutral currents 42 years ago. Anyway, I decided I would collect here a few random thoughts on the status of the field, as seen from my very skewed viewpoint...
Cryptography aims to secure communication. Eve should not be able to eavesdrop on the communication between Alice and Bob. Quantum cryptography is 100% secure in as far as the physics is concerned. However, it is unsatisfying if this security is merely promised by a still new and even partially controversial theory. Who wants to trust their most important secrets to something that may be wrong?
The Poster session of Neutrino Telescopes XVI will take place tonight in Venice, at the first floor of the beautiful Palazzo Franchetti. Poster submitters have produced excerpts for the conference blog, so you can also get a summary of the presented results.
The blog offers sixteen excerpts:
At the XVI Neutrino Telescopes conference going on this week in Venice there was a nice presentation on the results of the Borexino experiment. The text below is a writeup of the highlights from the talk, given by Cristiano Galbiati from Princeton University.
Synchrotron Light Source II (NSLS-II) at Brookhaven National Laboratory only achieved first light a few weeks ago and already collaborators at the X-Ray Powder Diffraction (XPD) beamline have tested a setup that yielded data on thermoelectric materials. The work was part of the commissioning activities for the XPD beamline, a process that fine-tunes the settings of beamline equipment to ready the facility for first scientific commissioning experiments in mid-March on its way to full user operations later in the year.
(The XVIth edition of "Neutrino Telescopes" is going on in Venice this week. The writeup below is from a talk by M.Nakahata at the morning session today. For more on the conference and the results shown and discussed there, see the conference blog.)
During the first afternoon session of the XVI Neutrino Telescopes conference (here is the conference blog, which contains a report of most of the lectures and posters as they are presented) Francis Halzen gave a very nice account of the discovery of cosmogenic neutrinos by the IceCube experiment, and its implications. Below I offer a writeup - apologizing to Halzen if I misinterpreted anything.
The XVI edition of "Neutrino Telescopes"
is about to start in Venice today. In the meantime, I have started to publish in the conference blog a few excerpts of the posters that compete for the "best poster award" at the conference this week. You might be interested to check them out:
International researchers have reported a nanoparticle (74 nm in diameter) that can be used as a contrast agent for six different medical imaging techniques:
- Near IR
- CT Scanning
- Fluorescence Imaging
- Photoacoustic Imaging
- PET Scanning
- Cerenkov-Luminescence Imaging
The core of the particle is covered by a porphyrin-phospholipid (PoP) wrapper. The initial tests were conducted on a turkey breast as the closest simulator to the human breast tissue.