Bart Kahr

TL;DR: In this article, seven new imidacloprid crystal polymorphs are reported, adding to two known forms, and measurements of insect knockdown times for the metastable crystal forms were as much as nine times faster acting than the commercial form against Aedes, Anopheles, and Culex mosquitoes as well as Drosophila (fruit flies).

TL;DR: The linear optical properties of sorbitol spherulites containing the azo dye amaranth were analyzed in detail so as to correct a persistent confusion in the literature regarding the orientational dependence of linear dichroism.

TL;DR: In this paper, a more inclusive view of optical activity is presented, which clarifies structure-property relationships in measurements of oriented molecules, commonly found in crystals, and methods for fitting intensity measurements in terms of the constitutive tensor that manifests as the differential refraction and absorption of circularly polarized light are described.

TL;DR: Friederich Froebel's background in crystallography infused every aspect of his conception of kindergarten, especially the self-actuated learning devices or "gifts" that were the centerpiece of his curriculum as discussed by the authors.

TL;DR: In this paper, the authors distinguish between five regimes of coherence for anisotropic and/or optically active media, and derive algebraic expressions valid for all regimes, and model experimental data spanning multiple regimes.