Search

The two-photon absorption (TPA) spectrum of a single crystal of CsUO2(NO3)3 was studied. This compound consists of equatorial ligands which surround the linear uranyl ion to form a trigonal array, unlike the chloride ions of Cs2UO2Cl4 which reside in a near-tetragonal environment. TPA spectroscopy complements one-photon absorption spectroscopy for electronic excitations which are parity conserving, although the chromophore is noncentric. These two types of experiments have established the location and symmetry of eight excited states and the determination of the site of the ninth.

The C. elegans vulva is a polarized epithelial tube that has been studied extensively as a model for cell-cell signaling, cell fate specification, and tubulogenesis. Here we used endogenous fusions to show that the spectrin cytoskeleton is polarized in this organ, with conventional beta-spectrin ( UNC-70 ) found only at basolateral membranes and beta heavy spectrin ( SMA-1 ) found only at apical membranes. The sole alpha-spectrin ( SPC-1 ) is present at both locations but requires SMA-1 for its apical localization. Thus, beta spectrins are excellent markers for vulva cell membranes and polarity., Competing Interests: The authors declare that there are no conflicts of interest present., (Copyright: © 2023 by the authors.)