Showing 2371 - 2380 of 5708 Items
Bowdoin Orient, v. 125, no. 23
Date: 1995-04-21
Access: Open access
- There are two volumes numbered 125. This is the original.
Bowdoin Orient, v. 126, no. [8]
Date: 1995-11-03
Access: Open access
- There are two volumes numbered 126. This is the original.
Bowdoin Orient, v. [128], no. 20
Date: 1998-04-10
Access: Open access
- This volume was misnumbered as volume 126.
"This people which I made": The Character of King Arthur as a Mechanism of Unification in Medieval Arthuriana and the Idylls of the King
Date: 2016-05-01
Creator: Hallie Schaeffer
Access: Open access
Some like it cold: the relationship between thermal tolerance and mitochondrial genotype in an invasive population of the European green crab, Carcinus maenas
Date: 2017-05-01
Creator: Aidan Fisher Coyle
Access: Open access
- Hybrid zones provide natural laboratories to study how specific genes, and interactions among genes, may influence fitness. On the east coast of North America, two separate populations of the European green crab (Carcinus maenas) have been introduced in the last two centuries. An early invasion from Southern Europe colonized New England around 1800, and was followed by a second invasion from Northern Europe to Nova Scotia in the early 1980s (Roman 2006). As these populations hybridize, new combinations of genes potentially adapted to different ends of a thermal spectrum are created in a hybrid zone. To test the hypothesis that mitochondrial and nuclear genes have effects on thermal tolerance, I measured response to cold stress in crabs collected from locations between southern Maine and northern Nova Scotia, and then genotyped the mitochondrial CO1 gene and two nuclear SNPs. Three mitochondrial haplotypes, originally from Northern Europe, had a strong effect on the ability of crabs to right themselves at a temperature of 4.5ºC. Crabs carrying these three haplotypes were 20% more likely to right compared to crabs carrying the haplotype from Southern Europe. The two nuclear SNPs, which were derived from transcriptome sequencing and were strong outliers between Northern and Southern European C. maenas populations, had no effect on righting response at low temperature. These results add C. maenas to the short list of ectotherms in which mitochondrial variation affects thermal tolerance, and suggests that natural selection is shaping the structure of the hybrid zone between the northern and southern populations This discovery of linkage between mitochondrial genotype and thermal tolerance also provides potential insight into the patterns of expansion for invasive populations of C. maenas around the world.
Damned If You Do, Damned If You Don't: A Logical Analysis of Moral Dilemmas
Date: 2018-05-01
Creator: Samuel Monkman
Access: Open access
- This project explores the logical structure of moral dilemmas. I introduce the notion of genuine contingent moral dilemmas, as well as basic topics in deontic logic. I then examine two formal arguments claiming that dilemmas are logically impossible. Each argument relies on certain principles of normative reasoning sometimes accepted as axioms of deontic logic. I argue that the principle of agglomeration and a statement of entailment of obligations are both not basic to ethical reasoning, concluding that dilemmas will be admissible under some logically consistent ethical theories. In the final chapter, I examine some consequences of admitting dilemmas into a theory, in particular how doing so complicates assignment of blame.
Narrative painting and visual gossip at the early-twentieth-century royal academy
Date: 2009-06-01
Creator: Pamela Fletcher
Access: Open access
- Narrative paintings of modern life were immensely popular at the Royal Academy from the 1850s well into the early twentieth century. Perfectly suited to the Academy's culture of conversation, the pictures invited viewers to respond to the scenes as if they were real life situations, and gossip about the depicted characters as if they were real people. While such responses were routinely derided by critics as evidence of the public's lack of aesthetic sophistication, they offer tantalizing glimpses of the pictures' social lives. This article argues that taking gossip seriously as a mode of engagement with art both amplifies our understanding of the meanings, functions, and pleasures of narrative painting, and suggests specific connections between exhibition culture and the meanings of pictures. Using the richly documented reception of the 'problem pictures' of the 1910s and 1920s as the primary evidence, this article establishes a taxonomy of gossipy modes of engagement with narrative painting, and argues that gossiping about pictures allowed for the performance of individual identity, the creation of social and artistic groups, and connected public and private understandings of the world.
Hybridization dynamics of a newly discovered parrotfish swarm in the Tropical Eastern Pacific
Date: 2017-05-01
Creator: Robert Barron
Access: Open access
- Hybrid zones and their dynamics are important in the understanding of the genetic basis of reproductive isolation and speciation. This study seeks to investigate the hybridization dynamics of a Scarus hybrid swarm within the Tropical Eastern Pacific (TEP) that includes four phenotypically distinct species: S. perrico, S. ghobban, S. rubroviolaceus, and S. compressus. Genetic and population structure analyses of four nuclear loci and a mitochondrial locus revealed that one of the four species, S. compressus, was the result of two different hybrid crosses: S. perrico ✕ S. rubroviolaceus and S. perrico ✕ S. ghobban. A NewHybrids model indicated that most of the S. compressus samples were F1 hybrids, but 21% of the S. compressus sample was classified as “parentals” which could also be explained by the presence of either F2 hybrids or backcrosses with S. compressus phenotypes, given the relatively low power of the nuclear data set (4 loci) to resolve complex hybrid genotypes. Significant mito-nuclear discordance in all three non-hybrid species is consistent with an evolutionary effect of backcrossing between F1 hybrids and “pure” species. This study reveals a relative ease of hybridization between parrotfish taxa separated by an estimated 4.5 million years of isolation and opens the door to further studies on the potential effects of gene flow across old species boundaries and perhaps the formation of new species by hybrid speciation in a diverse clade of tropical reef fish. Elucidating the nature of potentially “deep” F2 crosses and backcrosses within the TEP Scarus hybrid system will allow us to better understand the effects of hybridization on evolution and speciation on both a micro- and macro-ecological scale.
Bowdoin Orient, v. 51, no. 9
Date: 1921-06-03
Access: Open access
- Note there are two volumes of the Bowdoin Orient assigned numbered 51. The first comprises issues no. 1-10, April-June 1921. The second comprises issues no. 1-23, September 1921-March 1922.