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Magnetic fields exhibit higher-order, nonlinear singularities in the form of point-dipole singularities. In addition, due to absence of divergence, they feature only a subset of invariant structures from traditional vector field topol-ogy. For magnetic fields of sets of point dipoles—widely present in physics and often used as an approximation—we present a(More)
Optical tweezers are experimental tools with extraordinary resolution in positioning (± 1 nm) a micron-sized colloid and in the measurement of forces (± 50 fN) acting on it-without any mechanical contact. This enables one to carry out a multitude of novel experiments in nano- and microfluidics, of which the following will be presented in this review: (i)(More)
A greater appreciation of biotic responses to environmental changes is warranted in small, shallow lakes because of the high number of these habitats, and their unique contributions to regional biodiversity. Furthermore, recent water chemistry monitoring data show that shallow lakes in Ontario are sensitive and have responded significantly to environmental(More)
  • Shilin Huang, Giorgio Pessot, +6 authors Günter K. Auernhammera
  • 2015
1 Supplementary movies Movie S1 Typical 3D morphology of paramagnetic chains in a soft gel in the absence of a magnetic field. The elastic modulus of the gel is 0.78 ± 0.22 Pa and the scale bar is 300 µm. Movie S2 Typical 3D morphology of paramagnetic chains in a soft gel under a perpendicular magnetic field (B = 216.4 ± 1.1 mT). The elastic modulus of the(More)
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