We investigate the quantum dynamics of ultra-long-range trilobite molecules exposed to homogeneous electric fields. A molecule consists a Rydberg atom and ground-state atom, which is trapped at large internuclear distances in an oscillatory potential due scattering electron off atom. Within Born-Oppenheimer approximation, we derive analytic expression for two-dimensional adiabatic electronic en...

The Lower Paleozoic sediments of the Barrandian area are globally renowned as a classical example well-preserved skeletal marine fauna, including abundant remains trilobites. Several tens morphologically anomalous exoskeletons trilobites have been collected and documented from Cambrian to Devonian clastic carbonates. One them, an exceptionally well preserved, articulated partly enrolled exoskel...

Although carbonate-precipitating cyanobacteria are ubiquitous in aquatic ecosystems today, the criteria used to identify them in the geological record are subjective and rarely testable. Differences in the mode of biomineralization between cyanobacteria and eukaryotes, i.e., biologically induced calcification (BIM) vs. biologically controlled calcification (BCM), result in different crystallogr...