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Antimicrobial Activities of Polysaccharide-Rich Extracts from the Irish Seaweed , Generated Using Green and Conventional Extraction Technologies, Against Foodborne Pathogens.
Mar Drugs
January 2025
Section of Food and Nutrition, School of Agriculture and Food Science, University College Dublin, Belfield, D04 V1W8 Dublin, Ireland.
A rise in antimicrobial resistance coupled with consumer preferences towards natural preservatives has resulted in increased research towards investigating antimicrobial compounds from natural sources such as macroalgae (seaweeds), which contain antioxidant, antimicrobial, and anticancer compounds. This study investigates the antimicrobial activity of compounds produced by the Irish seaweed against and , bacterial species which are relevant for food safety. Microwave-assisted extraction (MAE), ultrasound-assisted extraction (UAE), ultrasound-microwave-assisted extraction (UMAE), and conventional extraction technologies (maceration) were applied to generate extracts from , followed by their preliminary chemical composition (total phenolic content, total protein content, total soluble sugars) and antimicrobial activity (with minimum inhibitory concentration determined by broth microdilution methods), examining also the molecular weight distribution (via high performance size exclusion chromatography) and oligosaccharide fraction composition (via high-performance liquid chromatography) of the polysaccharides, as they were the predominant compounds in these extracts, aiming to elucidate structure-function relationships.
View Article and Find Full Text PDFExplainable Deep Learning for Glaucomatous Visual Field Prediction: Artifact Correction Enhances Transformer Models.
Transl Vis Sci Technol
January 2025
Department of Biomedical Engineering, Faculty of Engineering, Mahidol University, Nakhon Pathom, Thailand.
Purpose: The purpose of this study was to develop a deep learning approach that restores artifact-laden optical coherence tomography (OCT) scans and predicts functional loss on the 24-2 Humphrey Visual Field (HVF) test.
Methods: This cross-sectional, retrospective study used 1674 visual field (VF)-OCT pairs from 951 eyes for training and 429 pairs from 345 eyes for testing. Peripapillary retinal nerve fiber layer (RNFL) thickness map artifacts were corrected using a generative diffusion model.
Discovery of three novel neutralizing antibody epitopes on the human astrovirus capsid spike and mechanistic insights into virus neutralization.
J Virol
January 2025
Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, California, USA.
Human astroviruses (HAstVs) are a leading cause of viral childhood diarrhea that infects nearly every individual during their lifetime. Although human astroviruses are highly prevalent, no approved vaccine currently exists. Antibody responses appear to play an important role in protection from HAstV infection; however, knowledge about the neutralizing epitope landscape is lacking, as only three neutralizing antibody epitopes have previously been determined.
View Article and Find Full Text PDFPeptide Inhibitor Assay for Allocating Functionally Important Accessible Sites Throughout a Protein Chain: Restriction Endonuclease EcoRI as a Model Protein System.
BioTech (Basel)
December 2024
The BCPH Unit of Molecular Physiology, Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus, Nishihara 903-0213, Okinawa, Japan.
Functionally important amino acid sequences in proteins are often located at multiple sites. Three-dimensional structural analysis and site-directed mutagenesis may be performed to allocate functional sites for understanding structure‒function relationships and for developing novel inhibitory drugs. However, such methods are too demanding to comprehensively cover potential functional sites throughout a protein chain.
View Article and Find Full Text PDFNanosecond Molecular Motion in pHP1α Liquid-Liquid Phase Separation Captured by Solid-State NMR.
J Phys Chem Lett
January 2025
Centre of High Field NMR Spectroscopy and Imaging, Nanyang Technological University, 21 Nanyang Link, Singapore 637371.
The relationship among protein structure, function, and dynamics is fundamental to biological activity, particularly in more complex biomolecular systems. Solid-state and solution-state NMR techniques offer powerful means to probe these dynamics across various time scales. However, standard assumptions about molecular motion are often challenged in phase-separated systems like phosphorylated heterochromatin protein 1 alpha (pHP1α), which exhibit both solid- and solution-like characteristics.
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