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Full-Text Articles in Physical Sciences and Mathematics
High Mass Star Formation And Methanol Masers, Nathanael Wilson
High Mass Star Formation And Methanol Masers, Nathanael Wilson
College of Science and Health Theses and Dissertations
Class I and Class II methanol (CH3OH) masers are believed to be good indicators for regions where high mass stars are being formed. High mass stars are important because they inuence the evolution of the Galaxy, but many details of their formation remain unknown. I present an investigation into the association of Class I and Class II CH3OH masers with high mass star formation in our Galaxy, in particular the evolutionary stages at which they occur. To do so, I have compared data on high mass star forming regions from the ATLASGAL survey with catalogs of Class I and Class …
X-Ray Diffraction And Structural Analysis Of Shark Vertebrae, Kathryn Griggs
X-Ray Diffraction And Structural Analysis Of Shark Vertebrae, Kathryn Griggs
DePaul Discoveries
Just like how rings correspond to the growth record of trees, some mineralized tissues of mammals contain temporal sequences of tissue development [Klevezal, 1996]. Shark vertebrae consist of cartilage mineralized with hydroxyapatite (HA). A recent study of vertebrae of seven shark species found that this tissue material stiffness and strength are similar to those of mammalian trabecular bone [Porter, 2006]. The periodic array of atoms in the HA nanocrystals in shark vertebrae produce peaks of diffracted intensity. The present project studied thousands of x-ray diffraction patterns of shark vertebrae collected at the Advanced Photon Source (APS) at Argonne National Laboratory. …
"Examining Continent-Scale Variation In Aerial Arbuscular Mycorrhizal Fungi Communities Using Edna, Raechel Hearth
"Examining Continent-Scale Variation In Aerial Arbuscular Mycorrhizal Fungi Communities Using Edna, Raechel Hearth
College of Science and Health Theses and Dissertations
Arbuscular mycorrhizal (AM) fungi form an important symbiosis with plants that make these fungi critical for plant health and ecosystem functioning. Although previous studies have shown that AM fungi disperse through the air, few studies have examined which environmental factors may be impacting their dispersal and aerial community composition, especially at large geographical scales. The goal of this study was to determine which environmental factors influenced air-dispersed AM fungal species composition across five different research sites in the Midwest and Western regions of the United States. By collecting dust at three different heights in the air, using modified Wilson and …