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Engineering hydrogen bonding at tyrosine-201 in the orange carotenoid protein using halogenated analogues.
Photosynth Res
January 2025
Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia.
The Orange Carotenoid Protein (OCP) is a unique water-soluble photoactive protein that plays a critical role in regulating the balance between light harvesting and photoprotective responses in cyanobacteria. The challenge in understanding OCP´s photoactivation mechanism stems from the heterogeneity of the initial configurations of its embedded ketocarotenoid, which in the dark-adapted state can form up to two hydrogen bonds to critical amino acids in the protein's C-terminal domain, and the extremely low quantum yield of primary photoproduct formation. While a series of experiments involving point mutations within these contacts helped us to identify these challenges, they did not resolve them.
View Article and Find Full Text PDFA Paper-Based Sensor for the Detection of Gastroesophageal Reflux Disease Utilizing a Cleavable Fluorescent Polymer.
Adv Healthc Mater
January 2025
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, P. R. China.
Nowadays, gastroesophageal reflux disease (GERD) has emerged as one of the major hazards to the health of the upper gastrointestinal tract, and there is an urgent need for a low-cost, user-friendly, and non-invasive detection method. Herein, a paper-based sensor (CP sensor) for the non-invasive screening of GERD is proposed. The sensor is structured as a specially shaped cellulose paper strip embedded with fluorescent colloids, which are self-assembled from a cleavable synthetic fluorescent polymer (P4).
View Article and Find Full Text PDFDevelopment of smart packaging halochromic films embedded with anthocyanin pigments; recent advances.
Crit Rev Food Sci Nutr
January 2025
Department of Food Materials and Process Design Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
Article Synopsis
- Innovative biodegradable packaging using pH-sensitive natural dyes, like anthocyanins, is emerging to enhance food quality monitoring.
- These smart systems provide real-time feedback to consumers about food freshness while also protecting against potential risks.
- Anthocyanins not only indicate changes in food quality but also offer antimicrobial and antioxidant benefits, contributing to longer shelf life and potential health benefits.
Membrane-embedded CdaA is required for efficient synthesis of second messenger cyclic di-AMP.
Commun Biol
December 2024
Department of Biochemistry, Groningen Biomolecular Science and Biotechnology Institute, University of Groningen, Nijenborgh 3, Groningen, The Netherlands.
Cyclic di-adenylate monophosphate (cyclic di-AMP) is an important second messenger in microorganisms. Cyclic di-AMP regulates bacterial cell volume and turgor via control of potassium and compatible solute transport but is also involved in many other processes, including the activation of the metazoan innate immune response to bacterial infections. We compare the activity of full-length membrane-embedded CdaA, the enzyme that synthesizes cyclic di-AMP, with the water-soluble catalytic domain CdaA-DAC.
View Article and Find Full Text PDFDeveloping High Energy Density Li-S Batteries via Pore-Structure Regulation of Porous Carbon Based Electrocatalyst.
Small
December 2024
School of Materials science and Engineering, Zhengzhou University, Zhengzhou, 450001, China.
The mesopores and macropores within porous carbon materials help increase the surface for the depostion of solid-state products, reduce the LiS film thickness, enhance electron and mass transport, and accelerate the reaction kinetics. However, an excessive amount of mesopores and macropores can lead to increased electrolyte consumption, particularly at high sulfur loadings, where excessive electrolyte usage hampers the enhancement of practical energy density in lithium-sulfur (Li-S) batteries. A rational pore structure can minimize the amount of electrolyte to fill the pores, thereby reducing electrolyte consumption while achieving rapid reaction kinetics and a high gravimetric energy density.
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