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Engineered collagen/PLLA composite fillers to induce rapid and long-term collagen regeneration.
J Mater Chem B
December 2024
National Engineering Research center for Biomaterials, College of Biomedical Engineering, Sichuan University, Chengdu 610064, China.
Article Synopsis
- Injectable subcutaneous fillers, like collagen and Sculptra, are commonly used to correct skin wrinkles, but traditional collagen fillers have drawbacks such as quick breakdown and frequent need for injections.
- A new type of filler, made from crosslinked collagen coated on poly(L-lactic acid) (PLLA) microspheres, has been developed to promote faster collagen regeneration.
- Testing showed that these composite fillers (Col@PLLA) not only boosted collagen production significantly within just 5 days of injection, but also maintained high collagen levels for up to 4 months, suggesting strong safety and potential for long-lasting effects.
Photoredox Activation of Donor-Acceptor Cyclopropanes: Distonic Radical Cation Reactivity in [3+2] Cycloaddition Reactions.
Angew Chem Int Ed Engl
December 2024
Department of Chemistry and Chemical Biology, Indian Institute of Technology (ISM) Dhanbad, Jharkhand, 826004, India.
Article Synopsis
- Altering the reactivity of molecules could resolve current limitations, especially for Donor-Acceptor Cyclopropanes (DACs) which have relied on Lewis acids for activation.
- Unpolarized alkenes present challenges due to a polarity mismatch with the Lewis acid-mediated zwitterionic intermediate, hindering their coupling.
- Using photoredox catalysis to leverage the distonic radical cation approach successfully navigates this mismatch, allowing for the formation of highly substituted cyclopentanes and facilitating new pathways to create bicyclo[3.1.1]heptanes through a unique [3σ+2σ] cycloaddition process.
Near-Infrared Two-Photon J-Aggregation-Induced Organic Fluorescent Dots with Large Stokes-Shift for Ratiometric Imaging of Hypochlorous Acid in Living Cells and Brains of AD Mice.
Adv Healthc Mater
November 2024
Anhui Provincial Key Laboratory of Biomedical Materials and Chemical Measurement, Laboratory of Functionalized Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002, China.
Alzheimer's disease (AD) is characterized by multiple toxicity from various biomarkers, and it is very important to monitor the fluctuation of biomarker level in brain tissues to track its early onset, illness progression, and therapeutic effect. Hypochlorous acid (HOCl) is confirmed to be a reliable biomarker to extend the scope of diagnosis. However, the practical applications of the developed conjugated small molecule fluorescent probes for detecting HOCl are often restricted to a large extent by their low solubility, aggregation-caused quenching (ACQ), unsatisfactory fluorescence brightness, small Strokes-shift, and lack of self-correcting ratiometric emitters.
View Article and Find Full Text PDFDeep Learning Enhanced in Situ Atomic Imaging of Ion Migration at Crystalline-Amorphous Interfaces.
Nano Lett
November 2024
Beijing Advanced Innovation Center for Intelligent Robots and Systems and School of Medical Technology, Beijing Institute of Technology, Beijing 100081, China.
Article Synopsis
- Understanding ion transport at interfaces is crucial for enhancing energy storage and neuromorphic computing but is complicated by atomic changes and limited imaging techniques.
- A new in situ electric manipulator in a high-tech microscope, along with deep learning for image enhancement, improves atomic observation threefold, allowing for analysis of potassium ion migration in antimony selenide.
- The study uncovers a stable insertion pathway for potassium ions and unexpected changes during their extraction, aiding in the design of better nanostructured materials.
Supported Cu/Ni Bimetallic Cluster Electrocatalysts Boost CO Reduction.
Precis Chem
March 2024
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
Supported metal clusters with the integrated advantages of single-atom catalysts and conventional nanoparticles held great promise in the electrocatalytic carbon dioxide reduction (ECOR) operated at low overpotential and high current density. However, its precise synthesis and the understanding of synergistically catalytic effects remain challenging. Herein, we report a facile method to synthesize the bimetallic Cu and Ni clusters anchored on porous carbon (Cu/Ni-NC) and achieve an enhanced ECOR.
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