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Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Probing the transient and time-variable sky.
Open Res Eur
January 2025
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, 91125, USA.
The study of transient and variable events, including novae, active galactic nuclei, and black hole binaries, has historically been a fruitful path for elucidating the evolutionary mechanisms of our universe. The study of such events in the millimeter and submillimeter is, however, still in its infancy. Submillimeter observations probe a variety of materials, such as optically thick dust, which are hard to study in other wavelengths.
View Article and Find Full Text PDFThe bursatellin-oxazinin family is a series of tyrosine-derived, nitrile-containing marine natural products from gastro-pod and bivalve molluscs. Although the first analogs were identified and associated with toxicity forty years ago, their biosynthetic origins were unknown. During an investigation of published mollusc genomes and transcriptomes, we serendipitously identified a putative bursatellin biosynthetic gene cluster (referred hereafter as the pathway).
View Article and Find Full Text PDFCoupled Polymethine Dyes: Six Decades of Discoveries.
Chem Rec
December 2024
Aix-Marseille Univ, CNRS UMR 7325, Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Campus de Luminy, case 913, Marseille cedex 09, 13288, France.
This review provides a comprehensive examination of the applications of the seminal coupling principle introduced by Siegfried Dähne and Dieter Leupold in 1966. Their heuristic and groundbreaking work proposed that combining multiple polymethine subunits within a single chromophore enables orbital coupling, consequently narrowing the HOMO-LUMO gap, and yielding redshifted optical properties. These outcomes are particularly valuable for developing organic dyes tailored for visible-to-near-infrared applications.
View Article and Find Full Text PDFCombining Simple Deformations to Elicit Complex Motions and Directed Swimming of Smart Organic Crystals with Controllable Thickness.
Angew Chem Int Ed Engl
November 2024
College of Chemistry and Chemical Engineering, Qingdao University, Shandong, 266071, China.
The lack of control over the crystal growth in a systematic way currently stands as an unsurmountable impediment to the preparation of dynamic crystals as soft robots; in effect, the mechanical effects of molecular crystals have become a subject of scattered reports that pertain only to specific crystal sizes and actuation conditions, often without the ability to establish or confirm systematic trends. One of the factors that prevents the verification of such performance is the unavailability of strategies for effectively controlling crystal size and aspect ratio, where crystals of serendipitous size are harvested from crystallization solution. Here we devised a water-assisted precipitation method to prepare crystals of chemical variants of 9-anthracene derivatives with various thicknesses that respond to ultraviolet light with simple mechanical effects, including bending, splintering, and rotation.
View Article and Find Full Text PDFA serendipitous crossed aldol reaction in the ligand periphery of a Ru(II) polypyridyl complex in silica bed: prospects for delivering anticancer agents for photoactivated chemotherapy.
Dalton Trans
November 2024
Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh, India.
The localized drug action in tumors to overcome the side effects of chemotherapy has become an impetus for the development of photoactivated chemotherapy (PACT). As potential PACT agents, ruthenium(II) polypyridyl complexes have emerged as efficient photocages for anticancer agents. Bioactive molecules possessing functional groups such as nitrile, thioether, pyridine, imidazole, .
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