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Metal-capped molecular hosts are unique in supramolecular chemistry, benefitting from the inner cavity's hydrophobic nature and the metal center's electrochemical properties. It is shown here that the paramagnetic properties of the metals in lanthanide-capped cyclodextrins (Ln-α-CDs and Ln-β-CDs) are a convenient NMR indicator for different populations of host-guest complexes in a given solution. The paramagnetic guest exchange saturation transfer (paraGEST) method was used to study the exchange dynamics in systems composed of Ln-α-CDs or Ln-β-CDs with fluorinated guests, revealing multiple co-existing populations of host-guest complexes exclusively in solutions containing Ln-β-CDs. The enhanced spectral resolution of paraGEST, achieved by a strong pseudo contact shift induction, revealed that different molecular guests can adopt multiple orientations within Ln-β-CDs' cavities and, in contrast, only a single orientation inside Ln-α-CDs. Thus, paraGEST, which can significantly improve NMR detectability and spectral resolution of host-guest systems that experience fast exchange dynamics, is a convenient tool for studying supramolecular systems of metal-capped molecular hosts.
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http://dx.doi.org/10.1039/d3sc03630h | DOI Listing |
J Cereb Blood Flow Metab
December 2024
Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy.
This study presents the first in vivo measurement of transcytolemmal water exchange in the brain using a novel Magnetic Resonance technique. We extend previous applications of Chemical Exchange Saturation Transfer (CEST) to examine water exchange across cellular membranes in late-stage chicken embryo brains. The immature blood-brain barrier at this stage allows Gadolinium-Based Contrast Agents (GBCAs) to penetrate the brain's interstitial space, sensitizing the CEST effect to water exchange between intra- and extracellular environments.
View Article and Find Full Text PDFVopr Kurortol Fizioter Lech Fiz Kult
December 2024
S.I. Spasokukotsky Moscow Centre for Research and Practice in Medical Rehabilitation, Restorative and Sports Medicine of the Moscow Healthcare Department, Moscow, Russia.
Unlabelled: Essential arterial hypertension (EAH) is a chronic non-communicable disease (CNCD), that develops in parallel with other pathologies of the CNCD group, the presence of which is promoted by hypodynamia with consequent disturbance of aerobic energy supply processes. These disorders include, in particular, degenerative-dystrophic processes of the locomotor system, comprising of the cervical spine. In turn, development of these processes can additionally worsen hemodynamics with disturbance of the oxygen transfer processes.
View Article and Find Full Text PDFJ Chromatogr A
December 2024
Department of Biochemical Engineering, School of Chemical Engineering and Technology and Key Laboratory of Systems Bioengineering and Frontiers Science Center for Synthetic Biology (Ministry of Education), Tianjin University, Tianjin 300350, PR China. Electronic address:
Our previous studies on protein adsorption onto anion-exchangers of poly(ethylenimine) (PEI)-grafted Sepharose FF (PEI-Sepharose) proved their significantly improved performance over the commercial nongrafting anion-exchangers such as Q Sepharose FF, and it was found the protein adsorption behavior on PEI-Sepharose was more sensitive to counterions (Cl, SCN, HPO and SO). However, the complicated role of counterions has not been well interpreted due to their distinct chemical and physical characteristics. Thus, we have further studied the counterion effects by adding two halide ions (F and Br) to explore the effects of the three halide ions on bovine serum albumin adsorption and the results were compared with previous data.
View Article and Find Full Text PDFPlant Cell Environ
December 2024
Biological Sciences, School of Natural Sciences, University of Tasmania, Hobart, Tasmania, Australia.
Vapour pressure deficit (VPD) is a primary determinant of stomatal behaviour and water balance in plants. With increasing global temperature, the accompanying rise in VPD is likely to have a significant impact on the performance of plant species in the future. However, the plasticity of stomatal response to VPD remains largely unexplored.
View Article and Find Full Text PDFFront Plant Sci
December 2024
BIODYNE Biosystems Dynamics and Exchanges, TERRA Teaching and Research Center, Gembloux Agro-Bio Tech, University of Liege, Gembloux, Belgium.
Introduction: The identification of the physiological processes limiting carbon assimilation under water stress is crucial for improving model predictions and selecting drought-tolerant varieties. However, the influence of soil water availability on photosynthesis-limiting processes is still not fully understood. This study aimed to investigate the origins of photosynthesis limitations on potato () during a field drought experiment.
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