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Full-Text Articles in Physical Sciences and Mathematics
A Spectroscopic And Photometric Survey Of The W4 Hii Region And Its Young Stellar Population, Matt Wentzel-Long
A Spectroscopic And Photometric Survey Of The W4 Hii Region And Its Young Stellar Population, Matt Wentzel-Long
Dissertations
The W4 HII region is home to a large number of O and B-type stars as well as the young open cluster IC 1805. OB-type produce intense photoionizing radiation and stellar winds that can induce star formation in surrounding molecular clouds and sometimes carve out large regions of decreased particle density called superbubbles. During the star formation process, young stellar objects (YSOs) are initially surrounded by circumstellar disks made of gas and dust which naturally dissipate after several million years. The dissipation of the disk is thought to occur for a variety of reasons, including photoevaporation by the encompassed protostar …
Phase Transition Behaviour In Yeast And Bacterial Populations Under Stress, Stephen Ordway, Dawn King, David Friend, Christine Noto, Snowlee Phu, Holly Huelskamp, R. Inglis, Wendy Olivas, Sonya Bahar
Phase Transition Behaviour In Yeast And Bacterial Populations Under Stress, Stephen Ordway, Dawn King, David Friend, Christine Noto, Snowlee Phu, Holly Huelskamp, R. Inglis, Wendy Olivas, Sonya Bahar
Physics Faculty Works
Non-equilibrium phase transitions from survival to extinction have recently been observed in computational models of evolutionary dynamics. Dynamical signatures predictive of population collapse have been observed in yeast populations under stress. We experimentally investigate the population response of the budding yeast Saccharomyces cerevisiae to biological stressors (temperature and salt concentration) in order to investigate the system's behaviour in the vicinity of population collapse. While both conditions lead to population decline, the dynamical characteristics of the population response differ significantly depending on the stressor. Under temperature stress, the population undergoes a sharp change with significant fluctuations within a critical temperature range, …