We report the Negishi coupling based synthesis of 1,2,3-tri(9-anthryl)benzene derivatives containing three radially arranged anthracenes in a π-cluster. In the crystalline state of the unsubstituted derivative, intermolecular π-π and CH-π interactions between the anthracene units drive the formation of the two-dimensional packing structure. Owing to though-space π-conjugation between anthracene units, the substances have unique electronic properties. The excited-state dynamic behavior occurring between the three anthracene moieties, such as exciton localization/delocalization, was elucidated by means of transient absorption measurements and quantum chemical calculations. Interestingly, even though the three anthracenes are closely oriented with approximately 3.0 Å between their C-9 positions, exciton localization on two anthracene units is energetically favorable because of the flexible nature of the radially arranged aromatic rings.
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http://dx.doi.org/10.1002/chem.202104245 | DOI Listing |
Background: Understanding peripheral ulnar nerve anatomy is necessary to refine surgical treatment of ulnar nerve injuries. This study topographically mapped the ulnar nerve and its distal branch points from a well-defined surgical landmark and assessed for variations in interfascicular motor arrangement and branch size.
Methods: Fifty-four cadaveric upper extremities were dissected to expose the distal ulnar nerve and its branches (dorsal cutaneous (DCB), volar sensory (VSB), and motor branches).
BMC Plant Biol
December 2024
Department of Vegetable and Mushroom Growing, Hungarian University of Agriculture and Life Sciences, Villányi Út 29-43, Budapest, Hungary.
Background: The use of vegetable grafting has proven to be effective not only in providing stress resistance but also improving fruit yields. There have been no studies on grafted vegetables' effects on the vascular systems, specifically xylem vessels. This study tested the effects of two groups of rootstocks, Solanum spp.
View Article and Find Full Text PDFPolyclad flatworms possess an intricately branched digestive system combining features of a gastrovascular cavity as well as a gastrointestinal tract. Nonetheless, the functions of this system remain unconfirmed, due to a lack of effective observation methods. This paper presents a novel staining method to facilitate the analysis of this highly branched digestive system.
View Article and Find Full Text PDFACS Omega
December 2024
Petroleum and Chemical Engineering Department, College of Engineering, Sultan Qaboos University, Muscat 123, Oman.
Carbon nanotubes (CNTs) have emerged as one of the most capable and interesting materials in recent decades and have extraordinary mechanical properties (MPs) and resourceful applications in bioengineering and medicine. Equilibrium molecular dynamics simulations have been performed to investigate the structural and MPs of armchair, chiral, and semiconducting and metallic zigzag single-walled CNTs (SWCNTs) under varying temperature (K) and compressive and tensile strains ±γ (%) with reactive bond-order potential. New results elaborate on the buckling and deformation mechanisms of the SWCNTs through deep analyses of density profiles, radial distribution functions, structural visualizations, and stress-strain interactions.
View Article and Find Full Text PDFZhonghua Bing Li Xue Za Zhi
December 2024
Department of Pathology, Third Hospital, School of Basic Medical Sciences, Peking University Health Science Center, Beijing100191, China.
To investigate the relationship between the expression patterns of SOX2 and FOXG1 and the differentiation/development level of neural components in immature teratoma and to determine the clinical significance and potential application of this correlation in a clinical setting. We conducted a comprehensive whole transcriptome sequencing analysis to identify differentially expressed genes (DEGs) across various subtypes of ovarian germ cell tumors. Additionally, immunohistochemical staining of paraffin-embedded tissue sections was employed to assess the nuclear staining pattern of SOX2 and FOXG1 proteins within the tumor tissues.
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