New publication in Nature Communications

New publication in Nature Communications

News, Publications
Our paper entitled “Direct Detection of a Single Photon by Humans” by Tinsley J. N. et. al., has been published in Nature Communications. In this study we have shown that humans are capable of detecting a single photon onto their eyes with a probability above chance. This was done by developing a quantum light source based on spontaneous parametric down-conversion (SPDC) which can generate single-photon states of light and combining it with a state-of-the-art psychophysics procedure. Thereby we could show that the human visual system including the post-processing performed by the retina and the brain can detect a single photon incident onto the eye. Read the publication or a short summary. Please have also a look at the Nature News article by Davide Castelvecchi as well as the articles on…
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Congratulations to Qian Lin

Awards and honors, News
We congratulate her on the PhD title awarded by the university of Singapore. Previously, she worked on neurobehavioral manifestations of decision making. Recently, Qian Lin joined our group to strengthen our research focus on whole brain imaging to unravel the collective function of brain structures in simple behavioral paradigms.
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We welcome visiting scientists

News
We welcome Jeroen Delcour (Netherlands) and Ren Zicheng (China) as visiting scientists in our group. They will try to understand specific brain functions by applying our previously developed whole-brain imaging techniques (see our Publications) to animal models.
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New publication in J. Phys. Chem. B

News, Publications
Together with our colleagues at the Institute for Biophysical Dynamics at the University of Chicago, we have developed a method using infrared spectroscopy and atomistic modeling that would allow to better understand the mechanism behind the extreme ion selectivity and transport properties in ion channels. Our findings have recently been published in The Journal of Physical Chemistry B. [caption id="attachment_1312" align="aligncenter" width="584"] Location of the potassium channel KcsA in the cell membrane of bacteria. The schematic illustration on the right shows the changes in strength and direction of vibrational coupling inside the filter depending on the ion species, as found by the study. @David S. Goodsell & RCSB Protein Data Bank[/caption] Ion channels are essential structures of life. Ion channels are specialized pores in the cell membrane and move charged…
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New Publication in Analytical Chemistry

News, Publications
Together with our collaborator Markus Arndt we published in Analytical Chemistry on how to improve Laser-induced acoustic desorption (LIAD) for natural biochromophores. This methodology might enable us to use fragile biomolecules in Quantum-enhanced metrology experiments. Link to Paper or look up other publications of our group. Ugur Sezer, Lisa Wörner, Johannes Horak, Lukas Felix, Jens Tüxen, Christoph Götz, Alipasha Vaziri, Marcel Mayor, and Markus Arndt Laser-induced acoustic desorption of natural and functionalized biochromophores Anal. Chem., 2015, 87 (11), pp 5614–5619 (Download)
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We welcome our new Postdoc Michael Taylor

News
Michael got his PhD in Physics from the University of Queensland, Australia, where he worked on new experimental strategies for optical tweezers. Most notably, he combined optical tweezers with techniques from quantum optics to break the quantum limit to measurement precision, and used holographic beam shaping to increase trapping stiffness. Now he will begin developing a new fluorescent microscopy technology to image neuronal activity at greater depths.
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New Paper in eLife on a Non-Conventional Translocation Mechanism for Motor Proteins

News, Publications
Motors proteins of the conserved kinesin-14 family have important roles in mitotic spindle organization and chromosome segregation. Previous studies have indicated that kinesin-14 motors are non-processive enzymes, working in the context of multi-motor ensembles that collectively organize microtubule networks. Here we show that the yeast kinesin-14 Kar3 generates processive movement as a heterodimer with the non-motor proteins Cik1 or Vik1. By analyzing the single-molecule properties of engineered motors we demonstrate that the non-catalytic domain has a key role in the motility mechanism by acting as a 'foothold' that allows Kar3 to bias translocation towards the minus end. This mechanism rivals the speed and run length of conventional motors, can support transport of the Ndc80 complex in vitro and is critical for Kar3 function in vivo. Our findings provide an example for…
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New Paper in Biomedical Optics Express

News, Publications
Our recent paper "Optimizing and extending light-sculpting microscopy for fast functional imaging in neuroscience" on the improvement of our previously published imaging technique can be accessed via this Website. [caption id="attachment_1218" align="alignright" width="1020"] Experimental setup and various modalities of light sculpting microscopy.[/caption]  
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Two New WWTF Grants

News
The Vaziri lab has successfully secured with colleagues at IMP and IMBA two grants in the WWTF's Life Sciences Call 2014 - "IMAGING Innovative Biological and Biomedical Applications of Novel Imaging Technologies". The projects will be dedicated to building new super-resolution and high-speed whole-brain functional imaging techniques in behaving animals. Congratulations!
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