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Biomimetic syntheses of kadcoccitane H and kadcotrione C methyl ester.
Chem Sci
March 2025
Department of Chemistry, Indian Institute of Technology Kanpur Kanpur - 208016 India
Kadcotriones and kadcoccitanes, renowned for their intricate 6/6/5-tricyclic and 6/6/5/6-tetracyclic ring systems, respectively, exhibit promising biological activities. This work proposes a biosynthetic pathway that elucidates how nature synthesizes these triterpenoids from lanosterol. Inspired by this pathway, we present the first biomimetic syntheses of kadcoccitane H and kadcotrione C methyl ester.
View Article and Find Full Text PDFBicomponent Electrospinning of PVDF-Based Nanofiber Membranes for Air Filtration and Oil-Water Separation.
Polymers (Basel)
March 2025
Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China.
Particulate matter (PM) and water pollution have posed serious hazards to human health. Nanofiber membranes (NFMs) have emerged as promising candidates for the elimination of PMs and the separation of oil-water mixtures. In this study, a polyvinylidene difluoride (PVDF)-based nanofiber membrane with an average diameter of approximately 150 nm was prepared via a double-nozzle electrospinning technology, demonstrating high-efficiency PM filtration and oil-water separation.
View Article and Find Full Text PDFEffect of acupuncture in patients with postprandial distress syndrome: study protocol for a randomized controlled trial.
Front Med (Lausanne)
February 2025
School of Acupuncture-Moxibustion, Tuina and Rehabilitation, Hunan University of Chinese Medicine, Changsha, China.
Background: Postprandial distress syndrome (PDS) is the prominent subtype in patients with functional dyspepsia (FD) and currently lacks a satisfactory treatment. Acupuncture has become a promising alternative and complementary therapy for managing FD. However, high-level clinical evidence supporting the use of acupuncture for FD is limited.
View Article and Find Full Text PDFDesign and validation of A 30 ghz 8 × 8 slot antenna array with ridge waveguide pins/holes layers.
Sci Rep
March 2025
Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology, Gdansk, 80-233, Poland.
This paper presents an 8 × 8-element slot antenna array optimized for 30 GHz band applications, achieving high gain, wide impedance bandwidth, and high efficiency. The array employs a pin/hole-based design, which enables a compact structure and reduces fabrication complexity and cost, as it eliminates the need for electrical contact between its three primary layers: the metal radiating slot plate, a sub-array cavity layer, and a ridge waveguide feed network layer. The corporate feed network is realized through an array of pins and guiding ridges integrated into a metal plate, effectively distributing power to the radiating elements.
View Article and Find Full Text PDFVagal heart rate variability during rapid eye movement sleep reduces negative memory bias.
Front Behav Neurosci
February 2025
Department of Cognitive Science, University of California, Irvine, CA, United States.
Emotional memories change over time, but the mechanisms supporting this change are not well understood. Sleep has been identified as one mechanism that supports memory consolidation, with sleep selectively benefitting negative emotional consolidation at the expense of neutral memories, with specific oscillatory events linked to this process. In contrast, the consolidation of neutral and positive memories, compared to negative memories, has been associated with increased vagally mediated heart rate variability (HRV) during wakefulness.
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