Native Americans\u27 Responses to Obesity Attributions and Message Sources in an Obesity Prevention Campaign

This study investigated the effectiveness of Native American (NA) targeted obesity prevention messages. The researchers manipulated obesity attributions (internal vs. external) and message sources (NAs vs. non-NAs) in a 2 × 2 mixed experimental design to examine the way these message attributes influence NAs\u27 emotional, attitudinal, cognitive, and behavioral responses. One-hundred and eighteen Cheyenne and Arapaho (C&A) tribal citizens read two paper-based obesity prevention PSAs and then answered questions that assessed their message responses. The key findings demonstrated that the match between participants\u27 ethnicity and the message source\u27s ethnicity had a significant effect, as it reduced anger and promoted positive message attitudes and favorable source evaluations. Implications, limitations, and suggestions for future research and NA targeted health campaigns are discussed

Atomic Dipole Traps with Amplified Spontaneous Emission: A Proposal

We propose what we believe to be a novel type of optical source for ultra-cold atomic Far Off-Resonance optical-dipole Traps (FORTs). The source is based on an Erbium Amplified Spontaneous Emission (ASE) source that seeds a high power Erbium Doped Fiber Amplifier (EDFA). The main interest of this source is its very low coherence length, thus allowing an incoherent superposition of several trapping beams without any optical interference. The behavior of the superimposed beams is then a scalar sum greatly simplifying complex configurations. As an illustration, we report an estimation of the intensity noise of this source and an estimation of the atomic excess heating rate for an evaporative cooling experiment application. They are both found to be suitable for cold atoms experiments

Soil experiments on the prairie silt loam of southwest Missouri

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Co-operative experiments with alfalfa

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Soil experiments on the rolling limestone upland of southwest Missouri

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Grass investigations in the Ozark upland : first report

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Co-operative experiments of the Department of Agronomy

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Co-operative experiments of the Department of Agronomy

Caption title.Revision of Circular no. 36.[Slightly revised]

Modeling extracellular field potentials and the frequency-filtering properties of extracellular space

Extracellular local field potentials (LFP) are usually modeled as arising from a set of current sources embedded in a homogeneous extracellular medium. Although this formalism can successfully model several properties of LFPs, it does not account for their frequency-dependent attenuation with distance, a property essential to correctly model extracellular spikes. Here we derive expressions for the extracellular potential that include this frequency-dependent attenuation. We first show that, if the extracellular conductivity is non-homogeneous, there is induction of non-homogeneous charge densities which may result in a low-pass filter. We next derive a simplified model consisting of a punctual (or spherical) current source with spherically-symmetric conductivity/permittivity gradients around the source. We analyze the effect of different radial profiles of conductivity and permittivity on the frequency-filtering behavior of this model. We show that this simple model generally displays low-pass filtering behavior, in which fast electrical events (such as Na$^+$-mediated action potentials) attenuate very steeply with distance, while slower (K$^+$-mediated) events propagate over larger distances in extracellular space, in qualitative agreement with experimental observations. This simple model can be used to obtain frequency-dependent extracellular field potentials without taking into account explicitly the complex folding of extracellular space.Comment: text (LaTeX), 6 figs. (ps