Evaluation of Mysis partial diel vertical migration

Mass animal migrations represent large movements of biomass, energy, and nutrients with predictable patterns and important ecosystem-level consequences. Diel vertical migration (DVM) in aquatic systems, the daily movement of organisms from deeper depths during the day to shallower depths in the water column at night, is widespread in freshwater and marine systems. Recent studies, however, suggest partial migration behavior, whereby only some portion of a population migrates, is the rule rather than the exception in a range of migratory fauna, including those that undergo DVM. Hypotheses to explain why partial migrations occur complicate traditional views on DVM and challenge conventional theories. I address intraspecific variation in DVM behavior of an aquatic omnivore, Mysis diluviana, to test several long-standing assumptions about benthic-pelagic DVM in Mysis. I evaluated the extent of partial DVM and several potential drivers within a Lake Champlain Mysis population. I used traditional net-based field observations, a novel deep-water video camera system, and a laboratory experiment, to compare distributions, demographics, abundance estimates, hunger-satiation state, and feeding behavior, of migrant and non-migrant Mysis across multiple seasons, habitats, and different times of the day. Findings from my dissertation suggest Mysis partial DVM is common, and is associated with body size and demographic differences among individuals. Partial DVM behavior, however, did not correspond to strong differences in feeding preference or hunger-satiation state of individuals. My results contribute toward a more comprehensive understanding of migration theory and mysid biology, by including the often overlooked, but important, benthic habitat component of DVM studies, and fills in several ecological knowledge gaps regarding a key omnivore in many deep lake food webs across North America where Mysis serve as both predators and prey to many organisms

Hijacking Journalism: Legitimacy and Metajournalistic Discourse in Right-Wing Podcasts

Whereas personal expression has become a core practice of journalism whose merits can include greater attention to context and interpretative analysis, these freedoms from the constraints of traditional broadcast conventions can pose serious risks, including the ideological hijacking of journalism by partisan actors. In popular right-wing podcasts, such as those hosted by Ben Shapiro and Dan Bongino, the element of opinion amplifies the tendency of the podcast medium to relegate news to a secondary concern behind the emotional impact. Not only do podcasters like Shapiro and Bongino contribute to a fractured media environment of hyper-partisan news and commentary, but they also utilize social media platforms and transmedia networks to undermine traditional journalism and replace it with an alternative conservative media ecosystem - a multiplatform, full-service clearinghouse of news and commentary afforded by the publishing capabilities of the internet and the distribution algorithms of social media platforms like Facebook. This study charts the evolution of conservative audio production, from the influential work of talk radio star Rush Limbaugh through the latest innovations by conservative podcasters, as exemplified by Shapiro and Bongino. Our study builds on previous scholarship on metajournalistic discourse to examine how right-wing podcasters use exclusionary language to delegitimize the institution of journalism and offer a self-contained, ideologically conservative version of journalism as a replacement

The Role of Genomic Data in the Discovery, Annotation and Evolutionary Interpretation of the Interferon-Lambda Family

Type-I interferons, type-II interferons, and the IL-10 family are helical cytokines with similar three-dimensional folds. However, their homologous relationship is difficult to detect on the basis of sequence alone. We have previously described the discovery of the human type-III interferons (IFN lambda-1, -2, -3 or IL-29, IL-28A, IL-28B), which required a combination of manual and computational techniques applied to predicted protein sequences.Here we describe how the use of gene structure analysis and comparative genomics enabled a more extensive understanding of these genes early in the discovery process. More recently, additional mammalian genome sequences have shown that there are between one and potentially nine copies of interferon lambda genes in each genome, and that several species have single exon versions of the interferon lambda gene.The variable number of single exon type-I interferons in mammals, along with recently identified genes in zebrafish homologous to interferons allows a story of interferon evolution to be proposed. This model suggests that the gene duplications and single exon retrotransposons of mammalian type-III interferons are positively selected for within a genome. These characteristics are also shared with the fish interferons and could be responsible for the generation of the IL10 family and also the single exon type-I interferons

Where policy and practice collide: Comparing US,South African and European Union approaches toprotecting children online

That children have a right to protection when they go online is an internationally well-established principle, upheld in laws that seek to safeguard children from online abuse and exploitation. However, children’s own transgressive behaviour can test the boundaries of this protection regime, creating new dilemmas for lawmakers the world over. This article examines the policy response from both the Global North and South to young people’s online behaviour that may challenge adult conceptions of what is acceptable, within existing legal and policy frameworks. It asks whether the ‘childhood innocence’ implied in much protection discourse is a helpful basis for promoting children’s rights in the digital age. Based on a comparative analysis of the emerging policy trends in Europe, South Africa and the United States, the article assesses the implications for policy-makers and child welfare specialists as they attempt to redraw the balance between children’s online safety whilst supporting their agency as digital citizens

Atmospheric science

The following types of experiments for a proposed Space Station Microgravity Particle Research Facility are described: (1) growth of liquid water drop populations; (2) coalescence; (3) drop breakup; (4) breakup of freezing drops; (5) ice nucleation for large aerosols or bacteria; (6) scavenging of gases, for example, SO2 oxidation; (7) phoretic forces, i.e., thermophoresis versus diffusiophoresis; (8) Rayleigh bursting of drops; (9) charge separation due to collisions of rimed and unrimed ice; (10) charged drop dynamics; (11) growth of particles in other planetary atmospheres; and (12) freezing and liquid-liquid evaporation. The required capabilities and desired hardware for the facility are detailed

trans-Carbonyl­chloridobis(ethyl­diphenyl­phosphine-κP)rhodium(I)

The title compound, [RhCl(C14H15P)2(CO)], crystallizes with two almost identical mol­ecules in the asymmetric unit. The mol­ecules have the RhI atom in a square-planar geometry. The crystal structure involves intermolecular C—H⋯O hydrogen bonds