4,042 research outputs found
Do Humans Prefer Faces? Zygomatic Muscle Responses to Neutral Faces vs. Neutral Objects
The present study examined the significance of viewing images of neutral faces versus images of neutral objects on zygomatic muscle activity using facial EMG. Participants (60% women) from a pool of introductory psychology courses had their facial EMG recordings measured in response to images of neutral faces and neutral objects. Participants’ valence rating of each image was also recorded using the Self-Assessment Manikin (SAM) in order to rate their emotional response to each image. The primary hypothesis was that participants would have greater activity in the zygomatic muscle region when presented with images of neutral faces as opposed to lessor activity when presented with images of neutral objects. It was also hypothesized that if participants preferred seeing images of faces as compared to objects, their positive feelings would produce higher SAM ratings. Results from the present study indicated images of neutral faces showed no significant difference in EMG activity compared to images of neutral objects. Self-report data also showed no significant difference in pleasantness or emotional valence between ratings of neutral faces and ratings of neutral objects
Flow Generation by Rotating Colloids in Planar Microchannels
Non-equilibrium structure formation and conversion of spinning to
translational motion of magnetic colloids driven by an external rotating
magnetic field in microchannels is studied by particle-based mesoscale
hydrodynamics simulations. For straight channels, laning is found. In ring
channels, the channel curvature breaks symmetry and leads to a net fluid
transport around the annulus with the same rotational direction as the
colloidal spinning direction. The dependence of the translational velocity on
channel width, ring radius, colloid concentration, and thermal motion is
predicted.Comment: http://epljournal.edpsciences.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/epl/abs/2010/24/epl13212/epl13212.htm
Structure-function relations in phosphorylcholine-binding mouse myeloma proteins
The binding site interactions between the phosphorylcholine (phosphocholine)-binding mouse myeloma proteins TEPC 15, W3207, McPC 603, MOPC 167, and MOPC 511 and the isotopically substituted hapten phosphoryl-[methyl-13C]choline have been investigated using 13C and 31P nuclear magnetic resonance (NMR) spectroscopy. Each protein exhibits a unique NMR pattern, but extensive similarities in chemical shift parameters upon binding of hapten to immunoglobulin suggest a significant degree of conservation of important hapten-binding site interactions. Moreover, independent binding studies, in conjunction with the NMR data, allow construction of a simple model of the binding sites of these antibodies, analyzed in terms of the relative strength of interaction between hapten and two main subsites. The NMR evidence supports the view that the heavy chains of these proteins dominate in interacting with bound phosphorylcholine; the various subspecificities of these proteins for phosphorylcholine analogues can be accounted for by amino acid changes in the hypervariable regions of the heavy chains
Low-Temperature Dynamical Structure Factor of the Two-Leg Spin-1/2 Heisenberg Ladder
We determine the dynamical structure factor of the two-leg spin-1/2
Heisenberg ladder at low temperatures in the regime of strong rung coupling.
The dominant feature at zero temperature is the coherent triplon mode. We show
that the lineshape of this mode broadens in a non-symmetric way at finite
temperatures and that the degree of asymmetry increases with temperature. We
also show that at low frequencies a temperature induced resonance akin to the
Villain mode in the spin-1/2 Heisenberg Ising chain emerges.Comment: 13 pages, 7 figures, revte
\u3ci\u3eThe Nebraska Bird Review\u3c/i\u3e Whole Issue- Volume 69 Number 2 June 2001
Table of Contents
Spring Field Report, compiled by W. Ross Silcock ........................ 46
Species Accounts ........................ 48
Comments on Nebraska\u27s Falconiform and Strigiform bird fauna by Paul Johnsgard ........................ 80
1999 (Eleventh) Report of the NOU Records Committee compiled by Joel G. Jorgensen, ........................ 85
1999 - 2000 Nebraska Nesting Report by Wayne J. Mollhoff ........................ 92
NOU Treasurer\u27s Report, Calendar Year 2000........................ 10
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