Fluorescence image of atoms in a single layer of a cubic lattice obtained using Raman sideband cooling. The filling fraction in the center of the cloud is 40%. Approximately 750 photons per atom are collected during a 1.9 s exposure. The color bar is in arbitrary units*. [Copyright 2015 by the American Physical Society]
Fig 1: Set-up [Reprinted by permission from Macmillan Publishers Ltd: L. Trifunovic, F.L. Pedrocchi, S. Hoffman, P. Maletinsky, A. Yacoby & D. Loss, "High-efficiency resonant amplification of weak magnetic fields for single spin magnetometry at room temperature," Nature Nanotechnology (2015) doi:10.1038/nnano.2015.74]
Photo by Kris Snibbe
Gerald Holton, the Mallinckrodt Professor of Physics and Professor of the History of Science Emeritus, was born in Berlin in 1922.
He spent his boyhood in Vienna playing piano, reading Westerns, watching American films, and studying Latin, Greek, and the classics of Western literature in a rigorous Gymnasium. The turmoil of the Nazi era soon overturned his life and that of his Jewish family. In March 1938, as a boy of 16 during Anschluss, Holton watched from a balcony as Hitler passed by in an open car and German troops were feted by joyous mobs of Austrians...
An active water pumping windmill in Iowa; photograph by Ben Franske. [Published under the Creative Commons Attribution.]
Of the nearly 100 quadrillion British thermal units of energy (BTUs) used each year in the United States, 61 quads are wasted. That is not a moral judgment, or a commentary on insufficient conservation (poor insulation, idling cars, people failing to turn off lights when they leave a room). It is, as Mara Prentiss notes, predominantly fundamental physics: the fuel is burned, but less than 50 percent performs useful work...
Fig 1: MERFISH: a highly multiplexed smFISH approach enabled by combinatorial labeling and error-robust encoding. [Reprinted by permission from AAAS*]
Prof. Xiaowei Zhuang and members of her group have devised a method of visualizing RNA molecules inside cells so that the identity, location, and abundance of more than 1,000 different RNA species can be determined at the same time. The developers of the new technology say it should be possible to scale up the approach so that tens of thousands of RNA species can be imaged and identified in a single cell.