The Eschatological Iconography of the Derveni Krater

As Claude Rolley pointed out in his text on the Vix krater in La Tombe princière de Vix, the iconography of Greek bronze kraters varies notably from that of ceramic examples and is frequently suggestive of the original purpose of the vessel. Cows encircling the neck of an Archaic krater, Rolley suggested, indicate its probable initial purpose as a sanctuary dedication. The elaborate eschatological iconography of the Derveni krater, produced two centuries later, suggests its original purpose w..

Are Course Pages Useful? Getting Beyond Implementation and Usability

Academic Librarians have been creating research guides since the 1950s. These resources were design to help patrons become familiar with the basics of a subject or discipline. Research guides evolved into course pages, which provide resources related to a single course. This study considers students’ perceptions, and how that effects their intent to use the course page in the future. The study seeks to answer the question, does students’ perception of usefulness, interactivity, ease-of-use, attitude, and satisfaction effect their intention to use course pages? The method used for this study is adapted from the Technology Acceptance Model which looks for correlations between perceived usefulness, interactivity, ease-of-use, attitude, satisfaction, and intention to use. 47 undergraduate students from the University of North Carolina, Chapel Hill, responded to an online survey. These findings will help determine if student perceptions match the findings from previous studies regarding the usability and implementation of course pages.Master of Science in Library Scienc

Spectroscopy and Strong Decays of Charmed Baryons

Spectroscopy and strong decays of the charmed baryons are reviewed. Possible spin-parity quantum numbers of several newly observed charmed baryon resonances are discussed. Strong decays of charmed baryons are analyzed in the framework of heavy hadron chiral perturbation theory in which heavy quark symmetry and chiral symmetry are synthesized.Comment: 7 pages, to be published in the proceedings of CHARM07, Ithaca, NY, August 2007, eConf C07080

Structural and Compositional Changes in the Upper Atmosphere Related to the PEDE‐2018 Dust Event on Mars as Observed by MAVEN NGIMS

The onset of the planet encircling dust event (PEDE‐2018) started around 1 June 2018 as observed by Mars Reconnaissance Orbiter/Mars Color Imager, peaking around 7–10 July and persisting through mid‐October 2018. After the onset of the event, the upper atmosphere underwent significant changes in density and thermal structures. Mars Atmosphere and Volatile Evolution‐Neutral Gas and Ion Mass Spectrometer (MAVEN NGIMS) had a good opportunity to observe these changes from the first detection in the upper atmosphere and throughout the duration of the PEDE. The compositional changes included increased density at a constant altitude for CO2 and Ar, while the O decreased from the peak throughout the decay of the bulk of the PEDE.Plain Language SummaryFrom June through October 2018 Mars experienced a planet encircling dust event (PEDE‐2018), a fairly rare event last observed in 2007. The dust storm grew from a local event to cover the entire planet and was opaque enough that so little sunlight reached the surface that the solar‐powered opportunity rover ceased operations and all attempts to re‐establish contact with it were unsuccessful. Meanwhile, the orbiter Mars Atmosphere and Volatile Evolution (MAVEN) was able to observe changes in the upper atmosphere in the composition as a result of this globally extensive PEDE. MAVEN observed increases in both the CO2 and Ar while also observing an unexpected reduction in the O densities.Key PointsMAVEN/NGIMS observed increased of CO2 and Ar densities observed in the upper atmosphere corresponding to the peak of the dust eventUnexpected decrease in O densities in the upper atmosphere (160–250 km) was simultaneously observedComparisons between model and data results show good agreement with scale height and temperatures, further M‐GITM model revisions needed to capture circulation effectsPeer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/154472/1/grl59716_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/154472/2/grl59716.pd

Martian Thermospheric Warming Associated With the Planet Encircling Dust Event of 2018

We report the first observations of Martian thermospheric warming associated with the Planet Encircling Dust Event (PEDE) of 2018. We used dayglow observations made by the Imaging Ultraviolet Spectrograph instrument aboard the MAVEN spacecraft to retrieve the upper atmosphere temperature structures. Our analysis shows that the two‐cell meridional circulation pattern may be operating before the PEDE‐2018, which resulted in the cooling of lower/middle latitudes and warming at higher latitudes. However, after the onset, the existing circulation pattern gets dampened, resulted in a weaker latitudinal temperature structure. We saw that mean temperatures rose by about 20 K for the same local time after the onset of the dust storm. Our 3‐D Mars General Ionosphere Thermosphere Model calculations were able to reproduce the temperatures during the predust and early dust storm but failed to fully capture the temperature trend during the growth phase of the PEDE of 2018.Key PointsThe IUVS Observations show potential thermospheric warming associated with a global dust stormOur analysis shows active two-cell meridional circulation in the Martian thermosphere before the PEDE-2018Temperature observations show breakdown of nominal circulation during the dust stormPeer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/154332/1/grl60064.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/154332/2/grl60064_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/154332/3/grl60064-sup-0002-Table_SI-S01.pd

Clades of huge phages from across Earth's ecosystems.

Bacteriophages typically have small genomes1 and depend on their bacterial hosts for replication2. Here we sequenced DNA from diverse ecosystems and found hundreds of phage genomes with lengths of more than 200 kilobases (kb), including a genome of 735 kb, which is-to our knowledge-the largest phage genome to be described to date. Thirty-five genomes were manually curated to completion (circular and no gaps). Expanded genetic repertoires include diverse and previously undescribed CRISPR-Cas systems, transfer RNAs (tRNAs), tRNA synthetases, tRNA-modification enzymes, translation-initiation and elongation factors, and ribosomal proteins. The CRISPR-Cas systems of phages have the capacity to silence host transcription factors and translational genes, potentially as part of a larger interaction network that intercepts translation to redirect biosynthesis to phage-encoded functions. In addition, some phages may repurpose bacterial CRISPR-Cas systems to eliminate competing phages. We phylogenetically define the major clades of huge phages from human and other animal microbiomes, as well as from oceans, lakes, sediments, soils and the built environment. We conclude that the large gene inventories of huge phages reflect a conserved biological strategy, and that the phages are distributed across a broad bacterial host range and across Earth's ecosystems

The safety profile of varicella vaccine: a 10-year review

http://deepblue.lib.umich.edu/bitstream/2027.42/61293/1/Galea, The Safety Profile of Varicella Vaccine a 10 Year Review.pd

Author Correction: Cryptic inoviruses revealed as pervasive in bacteria and archaea across Earth's biomes.

An amendment to this paper has been published and can be accessed via a link at the top of the paper