Understanding the crystallization of enantiomorphically pure systems can be relevant to diverse fields such as the study of the origins of life or the purification of racemates. Here we report on polycrystalline epitaxial thin films of quartz on Si substrates displaying two distinct types of chiral habits that never coexist in the same film. We combine Atomic Force Microscopy (AFM) analysis and...

Let D n;k denote the subspace arrangement formed by all linear subspaces in R n given by equations of the form k. Some important topological properties of such a subspace arrangement depend on the topology of its intersection lattice. In previous work on a larger class of subspace arrangements by Bjj orner & Sagan BS] the topology of the intersection lattice L(D n;k) = n;k turned out to be a pa...

In French, regardless of stem regularity, inflectional verbal suffixes are extremely regular and paradigmatic. Considering the complexity of the French verbal system, we argue that all French verbs are polymorphemic forms that are decomposed during visual recognition independently of their stem regularity. We conducted a behavioral experiment in which we manipulated the surface and cumulative f...

Several coccolithophore species are known to exhibit heteromorphic life cycles. In certain species, notably Emiliania huxleyi, the heterococcolithbearing phase alternates with a non-calcifying stage, whereas in others the heterococcolith-bearing phase alternates with a holococcolith-bearing phase. Heterococcolithophore-holococcolithophore life cycles have previously been observed for only one s...