Jay Keystone (1943–2019)

Jay Johnson

It is seldom possible to plausibly define and observe a pool of potential entrants to a market. This study overcomes that limitation by taking advantage of an opportunity to reasonably define the potential entrants into MTBE production, a rapidly growing environmental product from the mid-1980’s to mid-1990’s. Potential entrants are identified as those firms having access to specific assets tha...

Jay Cummings: Research Statement

My research has touched many areas of combinatorics, including enumerative, algebraic, spectral, extremal and probabilistic. The projects below include finding the stationary distribution of a random coloring procedure, pursuing new directions in the math of juggling, working with undergraduates on Ramsey theory, and studying a pair of topics from spectral graph theory. I have mentored undergra...

Double keystone bird in a keystone species complex.

Species in a Colorado subalpine ecosystem show subtle interdependences. Red-naped sapsuckers play two distinct keystone roles. They excavate nest cavities in fungus-infected aspens that are required as nest sites by two species of swallows, and they drill sap wells into willows that provide abundant nourishment for themselves, hummingbirds, orange-crowned warblers, chipmunks, and an array of ot...

Laugh Track Jay

Keystone XL.

NEWS & ANALYSIS 826 New Neutrino May Have Heated Baby Universe 827 FDA Considers Trials of ‘ThreeParent Embryos’ 829 DNA Sequencers Still Waiting for the Nanopore Revolution 830 Antarctic Scientists Continue to Reel From Shutdown 831 Atlantic Current Can Shut Down for Centuries, Disrupting Climate >> Science Express Report by E. V. Galaasen et al. 833 Rival Detectors Prepare to Take Snapshots o...