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Jackson, MS, United States

Millsaps College is a private liberal arts college located in Jackson, in the U.S. state of Mississippi. Founded in 1890 and affiliated with the United Methodist Church, Millsaps is home to 985 students. Millsaps College is one of 40 colleges featured in Loren Pope's Colleges That Change Lives and is one of only 21 private colleges nationwide named a Best Buy in the 2013 Fiske Guide to Colleges. Wikipedia.

Hamilton C.A.,Auburn University | Hendrixson B.E.,Millsaps College | Brewer M.S.,University of California at Berkeley | Bond J.E.,Auburn University
Molecular Phylogenetics and Evolution | Year: 2014

The North American tarantula genus Aphonopelma provides one of the greatest challenges to species delimitation and downstream identification in spiders because traditional morphological characters appear ineffective for evaluating limits of intra- and interspecific variation in the group. We evaluated the efficacy of numerous molecular-based approaches to species delimitation within Aphonopelma based upon the most extensive sampling of theraphosids to date, while also investigating the sensitivity of randomized taxon sampling on the reproducibility of species boundaries. Mitochondrial DNA (cytochrome c oxidase subunit I) sequences were sampled from 682 specimens spanning the genetic, taxonomic, and geographic breadth of the genus within the United States. The effects of random taxon sampling compared traditional Neighbor-Joining with three modern quantitative species delimitation approaches (ABGD, P ID(Liberal), and GMYC). Our findings reveal remarkable consistency and congruence across various approaches and sampling regimes, while highlighting highly divergent outcomes in GMYC. Our investigation allowed us to integrate methodologies into an efficient, consistent, and more effective general methodological workflow for estimating species boundaries within the mygalomorph spider genus Aphonopelma. Taken alone, these approaches are not particularly useful - especially in the absence of prior knowledge of the focal taxa. Only through the incorporation of multiple lines of evidence, employed in a hypothesis-testing framework, can the identification and delimitation of confident species boundaries be determined. A key point in studying closely related species, and perhaps one of the most important aspects of DNA barcoding, is to combine a sampling strategy that broadly identifies the extent of genetic diversity across the distributions of the species of interest and incorporates previous knowledge into the "species equation" (morphology, molecules, and natural history). © 2013 Elsevier Inc. Source

The purpose of this study is to describe and explain river channel cross-sectional change in tributary streams within the 60-km scour zone of the Trinity River, Texas, downstream of Livingston Dam. This study investigates changes within the tributary systems to base level changes triggered by incision, associated with scour and channel migration within the dammed trunk stream. The dam represents a precise moment and place of a system perturbation and therefore represents an opportunistic geomorphic experiment. Geomorphological effects of the lower Trinity River tributaries were investigated through three different types of data: resurveys of bridge cross sections, planform change as measured from aerial photographs, and field mapping of changes in channel geometry using fallen trees, undercut banks, and other geomorphic indicators of change. While field evidence of channel change was found at sites well upstream of tributary confluences with the Trinity, these were not consistent with responses to lower base level. Downcutting and lateral changes in response to lowered base level were confined to lower tributary reaches. This suggests distance decay and lag times in transmission of responses upstream and/or masking of dam-induced effects by other processes and controls. The most dynamic locations of geomorphic change are near the confluences of the tributaries with the Trinity River, where the response to dam-induced incision is strongly influenced by local trunk stream morphology, indicating a high degree of historical and geographical contingency. © 2010 Elsevier B.V. Source

Harris J.B.,Millsaps College
Leading Edge (Tulsa, OK) | Year: 2010

In engineering geophysics, the use of shear-wave seismic methods for earthquake hazards analysis has primarily been limited to site-specific downhole, crosshole, and refraction studies for velocities to model site response to earthquake shaking and/or liquefaction potential. This paper demonstrates the utility of S-wave reflection methods in earthquake hazards studies, focusing on areas where collection of high-quality compressional-wave reflection data is problematic. Specific examples will show how S-wave reflection data help interpret the age, style, and extent of near-surface deformation in the New Madrid seismic zone of the central United States, and in mapping the Holocene-Pleistocene surface beneath the Fraser River delta in southwestern British Columbia (Canada). © 2010 Society of Exploration Geophysicists. Source

Campbell D.E.,Millsaps College | Wells J.D.,University of Massachusetts Amherst | Valacich J.S.,University of Arizona
Information Systems Research | Year: 2013

This research proposes that the forming of a business-to-consumer (B2C) customer relationship is part of a multiphased technology adoption process where attraction is the first step in this sequence. A conceptual model, called the electronic commerce (e-commerce) attraction model (eCAM), offers a theoretical foundation for guiding two empirical studies (N D345 and N D240, respectively) investigating how initial customer perceptions of a website influence attraction toward this website. The results support the eCAM as a new theoretical lens for understanding electronic commerce-based attraction. Comparisons are made between the proposed eCAM and previously established adoption models (i.e., the Technology Acceptance Model and WebQual) as well as the discriminant validity of the constructs in these models. Results demonstrate that the eCAM provides additional insights for understanding how website design influences e-commerce attraction and adoption. The implications of these results for future research and website design are discussed. © 2013 INFORMS. Source

Robinson S.J.Q.,Millsaps College | Zamick L.,Rutgers University | Sharon Y.Y.,Rutgers University
Physical Review C - Nuclear Physics | Year: 2011

We examine two recent effective shell model interactions, JUN45 and JJ4B, that have been proposed for use in the f5/2,p3/2,p 1/2,g9/2 model space for both protons and neutrons. We calculate a number of quantities that did not enter into the fits undertaken to fix the parameters of both interactions. In particular we consider the static quadrupole moments (Q's) of excited states of the even-even Ge70-76 isotopes, as well as the B(E2) values in these nuclei. (We previously studied Zn70 isotopes using JJ4B.) Some striking disagreements between the JUN45 predictions and the experimental results had already been noted for the quadrupole moments of the 21+ states, Q(21+)'s, of these nuclei. We investigate whether these discrepancies also occur for the JJ4B interaction. Subsequently, we also apply both interactions to calculate the Q's of some more highly excited states and compare the two sets of predictions regarding the nature of the nuclear states under consideration. We seek to understand the measured signs of the Q(21+)'s in the isotopic Ge chain by looking at a simple single-J shell model and also at the collective vibrational and rotational pictures. © 2011 American Physical Society. Source

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