Marshall University Department of Music presents a Junior Recital Laura Campbell, soprano

https://mds.marshall.edu/music_perf/1028/thumbnail.jp

Global Quantum Correlation in the Ising model

We study quantum correlations in an isotropic Ising ring under the effects of a transverse magnetic field. After characterizing the behavior of two-spin quantum correlations, we extend our analysis to global properties of the ring, using a figure of merit for quantum correlations that shows enough sensitivity to reveal the drastic changes in the properties of the system at criticality. This opens up the possibility to relate statistical properties of quantum many-body systems to suitably tailored measures of quantum correlations that capture features going far beyond standard quantum entanglement.Comment: Published in the International Journal of Quantum Information as part of the special issue devoted to "Quantum Correlations: entanglement and beyond

The Effects of Session Time and Satiation on the Form of the VI Response Function

There has been considerable recent controversy over the empirical form of the function relating response rate to reinforcement rate on Variable Interval (VI) schedules. Some theories (matching, for example) predict a monotonic relationship between response rate and reinforcement rate. Other theories (behavioral economics, for example) predict a bitonic relationship. There is empirical support for both positions. Recently, Dougan, Kuh, and Vink (in press) have shown that session length is one variable which alters the form of the function. Functions were predominantly monotonic when sessions were short (10 minutes), and predominantly bitonic when sessions were long (30 minutes), when data from the entire session were considered. However, the degree of bitonicity increased in successive 10-minute blocks within the 30-minute session, which is consistent with satiation processes. The present experiments further examined the effects of session length and satiation on the VI function. In Experiment 1, 8 rats were exposed to a ten-minute session either immediately preceding or immediately following a 20-minute time-out. Placement of the session relative to the time-out period had no effect on the form of the response function. In Experiment 2, 7 rats were exposed to a 10-minute session followed by a 20-minute time-out period. On some occasions, animals were prefed before the session. The response function was different depending on the prefeeding condition. The results are not consistent with recent demonstrations by McSweeney and her colleagues that response rates change systematically within reinforcement sessions. The results also suggest that satiation may play a role in the form of the VI response function

Dna2 Helicase/Nuclease Causes Replicative Fork Stalling and Double-strand Breaks in the Ribosomal DNA of Saccharomyces cerevisiae

We have proposed that faulty processing of arrested replication forks leads to increases in recombination and chromosome instability in Saccharomyces cerevisiae and contributes to the shortened lifespan of dna2 mutants. Now we use the ribosomal DNA locus, which is a good model for all stages of DNA replication, to test this hypothesis. We show directly that DNA replication pausing at the ribosomal DNA replication fork barrier (RFB) is accompanied by the occurrence of double-strand breaks near the RFB. Both pausing and breakage are elevated in the early aging, hypomorphic dna2-2 helicase mutant. Deletion of FOB1, encoding the fork barrier protein, suppresses the elevated pausing and DSB formation, and represses initiation at rDNA ARSs. The dna2-2 mutation is synthetically lethal with {Delta}rrm3, encoding another DNA helicase involved in rDNA replication. It does not appear to be the case that the rDNA is the only determinant of genome stability during the yeast lifespan however since strains carrying deletion of all chromosomal rDNA but with all rDNA supplied on a plasmid, have decreased rather than increased lifespan. We conclude that the replication-associated defects that we can measure in the rDNA are symbolic of similar events occurring either stochastically throughout the genome or at other regions where replication forks move slowly or stall, such as telomeres, centromeres, or replication slow zones

Strawberries (Frag X Anan) Are Bigger When Native Mason Bees (Osmia lignaria) Are Experimentally Added to Small Farms

Agriculture is the cornerstone of our economy, and pollination plays a vital role in nearly all non-wind pollinated crops. Declining honey bee populations have caused a more diligent investigation into using solitary bees for crop pollination. The native, solitary Orchard Mason Bee has shown to successfully pollinate almonds and apples, but there has been little work conducted on their effectiveness as a low fruit crop pollinator. This study assesses their effectiveness as a small strawberry farm pollinator, and preferences for nesting materials. Mason bee cocoons and nest homes made with different materials (bamboo, Phragmites, or wood) were supplemented on a side of each of nine family-owned farms. Fruit volumes were compared between treatment and the control sides of the farms where no additions were made. Mean strawberry volumes were greater and had faster growth rates on the treatment sides. There was higher occupancy in nest homes tubes made with bamboo

Warmth and Competence Perceptions of Female Job Candidates: Who Gets Hired?

This study explores how warmth and competence perceptions affect hireability of a female job candidate. The mixed model of stereotype content identifies warmth and competence as the two basic dimensions of person-perception, and research has shown a compensatory relationship between these two dimensions, especially for women. This study explores this compensatory effect for women in a hiring situation. Two samples, one of college students (n = 301) and another of MTurk participants (n = 256), read a description of a female job candidate of either high or low competence and either high, low, or no mention of warmth, and then rated her hireability. Candidates had the greatest hireability when high in competence, and competence had a greater effect on hireability than warmth. Warmth and competence perceptions were positively related, reflecting a halo effect, such that higher warmth was inferred from higher competence. Implications for hiring decisions of female professionals are discussed