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Example text
This discovery came largely through painstaking microelectrode recordings of single neurons, combined with anatomical tracing of connections from eye to brain that revealed a highly organized stripe-like segregation of inputs representing the two eyes in cortical layer 4, the gateway to the cortex. What was missing from this picture was an understanding of how neuronal connections within the other layers of the cerebral cortex are organized. A cortical column comprises some 10,000 neurons, each making thousands of connections.
1a). But what happens if the plasma’s motion brings together two magnetic field lines that point in opposite directions? The frozen-in picture assures us that all particles will remain on their respective field lines, regardless of how hard these are pushed together. But this picture is only an approximation, and in some circumstances — poorly understood at present — field lines slip relative to the plasma, and break and cross-link at an ‘X-point’ (Fig. 1b). The field lines, now sharply bent, act as a slingshot, imparting their stored energy to the particles and ejecting them at high speeds.
Edu Chung, Y. et al. Nature 439, 216–219 (2006). Meissner, A. & Jaenisch, R. Nature 439, 212–215 (2006). Weissman, I. L. N. Engl. J. Med. 346, 1576–1579 (2002). Hwang, W. S. et al. Science 308, 1777–1783 (2005). Committee on Science, Engineering, and Public Policy Scientific and Medical Aspects of Human Reproductive Cloning (National Academies Press, Washington DC, 2002). 6. Hurlbut, W. Monitoring Stem Cell Research 53–108 (President’s Council on Bioethics, Washington DC, 2004). 7. Strumpf, D. et al.