Aquilegia Volume 42 No. 3 - Annual Conference Issue: Knowledge, Advocacy, and Change

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Aquilegia Volume 41 No. 4 Summer 2017

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Aquilegia Volume 40 No. 2 Annual Conference Issue 2016 Annual Conference 2016; Forty Years of Change: Plants, People, Places

The CoNPS Annual Conference is the primary state gathering and annual fund-raiser for the Colorado Native Plant Society, a non-profit organization. Proceeds from the conference support CoNPS’ wide-ranging projects including education, conservation, native plant gardening, and botanical and horticultural publications and activities.https://epublications.regis.edu/aquilegia/1190/thumbnail.jp

Aquilegia, Vol. 40 No. 4, Fall 2016: Newsletter of the Colorado Native Plant Society

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Aquilegia Volume 41 No.1 Winter 2017

IN THIS ISSUE:Forty Years of Progress in Pollination Biology Return of the Native: Colorado Natives in Horticulture Climate Change and Columbines The Ute Learning and Ethnobotany Garden The Urban Prairies Project Book Reviewshttps://epublications.regis.edu/aquilegia/1192/thumbnail.jp

Aquilegia, Vol. 40 No. 1 - Winter 2015-2016, Newsletter of the Colorado Native Plant Society

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Whirling Hexagons and Defect Chaos in Hexagonal Non-Boussinesq Convection

We study hexagon patterns in non-Boussinesq convection of a thin rotating layer of water. For realistic parameters and boundary conditions we identify various linear instabilities of the pattern. We focus on the dynamics arising from an oscillatory side-band instability that leads to a spatially disordered chaotic state characterized by oscillating (whirling) hexagons. Using triangulation we obtain the distribution functions for the number of pentagonal and heptagonal convection cells. In contrast to the results found for defect chaos in the complex Ginzburg-Landau equation and in inclined-layer convection, the distribution functions can show deviations from a squared Poisson distribution that suggest non-trivial correlations between the defects.Comment: 4 mpg-movies are available at http://www.esam.northwestern.edu/~riecke/lit/lit.html submitted to New J. Physic

Aquilegia, Vol. 38 No. 4 - Fall, 2014, Newsletter of the Colorado Native Plant Society

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Staphylococcus aureus forms spreading dendrites that have characteristics of active motility

Staphylococcus aureus is historically regarded as a non-motile organism. More recently it has been shown that S. aureus can passively move across agar surfaces in a process called spreading. We re-analysed spreading motility using a modified assay and fo- cused on observing the formation of dendrites: branching structures that emerge from the central colony. We discovered that S. aureus can spread across the surface of media in struc- tures that we term ‘comets’, which advance outwards and precede the formation of dendrites. We observed comets in a diverse selection of S. aureus isolates and they exhibit the following behaviours: (1) They consist of phenotypically distinct cores of cells that move forward and seed other S. aureus cells behind them forming a comet ‘tail’; (2) they move when other cells in the comet tail have stopped moving; (3) the comet core is held together by a matrix of slime; and (4) the comets etch trails in the agar as they move forwards. Comets are not con- sistent with spreading motility or other forms of passive motility. Comet behaviour does share many similarities with a form of active motility known as gliding. Our observations therefore suggest that S. aureus is actively motile under certain conditions