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Los Angeles, CA, United States

Occidental College is a private, co-educational liberal arts college located in the historic Eagle Rock neighborhood of Los Angeles, California. Founded in 1887 by clergy and members of the Presbyterian Church, Occidental College is called Oxy by some students and alumni.The Carnegie Foundation for the Advancement of Teaching selected Occidental as a "community engagement institution". Wikipedia.

The increasing scientific and technical complexity in the American system of food production, exemplified in this article by genetically modified food (GMF), provides a useful case with which to understand public trust in experts and organizations involved in an emerging technology. Stating that the public will judge claims about GMF based on trust in their sources brings about the question of how the public decides to trust particular sources. I use data from a mail survey to evaluate the elements of trust for a range of groups connected to the U.S. food industry. The results point to organizationally variable and dependent perceptions of trust rather than a stable set of elements, suggesting that scholars might focus productively on the ways elements of trust are distributed. © 2013 Elsevier Ltd. Source

McCormack J.E.,Occidental College | Faircloth B.C.,University of California at Los Angeles
Molecular Ecology | Year: 2013

It has been a tumultuous 5 years in phylogeography and phylogenetics during which both fields have struggled to harness the power of next-generation sequencing (NGS) (Ekblom & Galindo; McCormack et al.). Fortunately, several methodological approaches appear to be taking root. In this issue of Molecular Ecology, O'Neill et al.) employ one such method - parallel tagged sequencing (PTS) - to elucidate the phylogeography of a tiger salamander (Ambystoma tigrinum) species complex. This study demonstrates a practical application of NGS on a scale appropriate (and not overkill) for most biologists interested in phylogeography (~100 loci for ~100 individuals), and their results highlight several analytical challenges that lie ahead for researchers employing NGS techniques. © 2012 Blackwell Publishing Ltd. Source

Goffredi S.K.,Occidental College
Environmental Microbiology Reports | Year: 2010

Symbioses involving bacteria and invertebrates contribute to the biological diversity and high productivity of both aquatic and terrestrial environments. Well-known examples from chemosynthetic deep-sea hydrothermal vent environments involve ectosymbiotic microbes associated with the external surfaces of marine invertebrates. Some of these ectosymbioses confer protection or defence from predators or the environment itself, some are nutritional in nature, and many still are of unknown function. Several recently discovered hydrothermal vent invertebrates, including two populations of yeti crab (Kiwa spp.), a limpet (Symmetromphalus aff. hageni), and the scaly-foot snail (as yet undescribed), support a consortium of diverse bacteria. Comparisons of these ectosymbioses to those previously described revealed similarities among the associated microorganisms, suggesting that certain microbes are indigenous to the surfaces of marine invertebrates. In particular, members of the Thiovulgaceae (epsilonproteobacteria) and Thiotrichaceae (gammaproteobacteria) appear to preferentially form ectosymbioses with vent crustaceans and gastropods. Interactions between specific Proteobacteria and the surfaces of many marine invertebrates likely have ecological and evolutionary significance at these chemically challenging habitats. © 2010 Society for Applied Microbiology and Blackwell Publishing Ltd. Source

Okumura C.Y.M.,Occidental College | Nizet V.,University of California at San Diego
Annual Review of Microbiology | Year: 2014

The development of a severe invasive bacterial infection in an otherwise healthy individual is one of the most striking and fascinating aspects of human medicine. A small cadre of gram-positive pathogens of the genera Streptococcus and Staphylococcus stand out for their unique invasive disease potential and sophisticated ability to counteract the multifaceted components of human innate defense. This review illustrates how these leading human disease agents evade host complement deposition and activation, impede phagocyte recruitment and activation, resist the microbicidal activities of host antimicrobial peptides and reactive oxygen species, escape neutrophil extracellular traps, and promote and accelerate phagocyte cell death through the action of pore-forming cytolysins. Understanding the molecular basis of bacterial innate immune resistance can open new avenues for therapeutic intervention geared to disabling specific virulence factors and resensitizing the pathogen to host innate immune clearance. Copyright © 2014 by Annual Reviews. All rights reserved. Source

Eggleston D.L.,Occidental College
Physics of Plasmas | Year: 2012

A single-particle computer code with collisional effects is used to study asymmetry-induced radial transport of a non-neutral plasma in a coaxial Malmberg-Penning trap. Following the time variation of the mean change and mean square change in radial position allows for the calculation of the radial drift velocity v D and the diffusion coefficient D as defined by the radial flux equation Γ = -Ddn 0/dr + n 0v D. For asymmetries of the form ψ 1 (r) cos (kz + ωt lθ) and periodic boundary conditions, the transport coefficients obtained match those predicted by resonant particle transport theory where the transport is produced by particles with velocities near (±lω R - ω)/k, with R being the azimuthal rotation frequency. For asymmetries of the form ψ 1 (r) cos (kz) cos (ωt lθ) and low collision frequency, there is a second contribution to the transport produced by low velocity particles axially trapped in the asymmetry potential. These produce a stronger variation of D with ω with a peak at ω = ω R. The width of the peak δω increases with center conductor bias and decreases with radius, while the height shows the opposite behavior. The transport due to axially trapped particles is typically comparable to or larger than that from resonant particles. This second contribution to the transport may explain the discrepancies between experiments and resonant particle theory. © 2012 American Institute of Physics. Source

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