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Inhibition of prefrontal glutamatergic neuron activity during the recovery period following chronic stress disrupts fear memory in male rats: potential role of the infralimbic cortex.
Learn Mem
January 2025
Department of Psychology, Arizona State University, Tempe, Arizona 85287, USA
Chronic stress typically leads to deficits in fear extinction. However, when a delay occurs from the end of chronic stress and the start of fear conditioning (a "recovery"), rats show improved context-cue discrimination, compared to recently stressed rats or nonstressed rats. The infralimbic cortex (IL) is important for fear extinction and undergoes neuronal remodeling after chronic stress ends, which could drive improved context-cue discrimination.
View Article and Find Full Text PDFAnalysis of enzyme kinetics of fungal methionine synthases in an optimized colorimetric microscale assay for measuring cobalamin-independent methionine synthase activity.
Enzyme Microb Technol
January 2025
Protein Chemistry and Enzyme Technology, Department of Biotechnology and Biomedicine, Building 221, Technical University of Denmark, Lyngby DK-2800 Kgs, Denmark. Electronic address:
Aspergillus spp. and Rhizopus spp., used in solid-state plant food fermentations, encode cobalamin-independent methionine synthase activity (MetE, EC 2.
View Article and Find Full Text PDFCompact and cGMP-compliant automated synthesis of [F]FSPG on the Trasis AllinOne™.
EJNMMI Radiopharm Chem
January 2025
School of Biomedical Engineering & Imaging Sciences, King's College London, St Thomas' Hospital, London, SE1 7EH, UK.
Background: (S)-4-(3-F-Fluoropropyl)-ʟ-glutamic acid ([F]FSPG) is a positron emission tomography radiotracer used to image system x, an antiporter that is upregulated in several cancers. Not only does imaging system x with [F]FSPG identify tumours, but it can also provide an early readout of response and resistance to therapy. Unfortunately, the clinical production of [F]FSPG has been hampered by a lack of robust, cGMP-compliant methods.
View Article and Find Full Text PDFPhysio-biochemical and molecular mechanisms of low nitrogen stress tolerance in peanut (Arachis hypogaea L.).
Plant Mol Biol
January 2025
Henan Key Laboratory for Molecular Ecology and Germplasm Innovation of Cotton and Wheat and Xinxiang Key Laboratory of Crop Root Biology and Green Efficient Production, School of Life Sciences, Henan Collaborative Innovation Center of Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, 453003, Henan, China.
Nitrogen (N) is a major plant nutrient and its deficiency can arrest plant growth. However, how low-N stress impair plant growth and its related tolerance mechanisms in peanut seedlings has not yet been explored. To counteract this issue, a hydroponic study was conducted to explore low N stress (0.
View Article and Find Full Text PDFEvolution and Functional Diversification of Serine Racemase Homologs in Bacteria.
J Mol Evol
January 2025
Department of Plant and Soil Sciences, 311 Plant Science Building, University of Kentucky, Lexington, KY, 40546-0312, USA.
Amino acid racemases catalyze the interconversion of L- and D-amino acids, maintaining intracellular levels of both D- and L-amino acids. While alanine and glutamate racemases are widespread in bacteria, serine racemase (SerR) is predominantly found in animals. Recently, homologs of animal SerR were reported in some bacterial genomes, but their evolutionary distribution and functional roles remain poorly understood.
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