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Mailhiot S, Peuravaara P, Egleston BD, Kearsey RJ, Mareš J, Komulainen S, Selent A, Kantola AM, Cooper AI, Vaara J, Greenaway RL, Lantto P, Telkki VV. Gas Uptake and Thermodynamics in Porous Liquids Elucidated by 129Xe NMR. J Phys Chem Lett 2024; 15:5323-5330. [PMID: 38724016 PMCID: PMC11129303 DOI: 10.1021/acs.jpclett.4c00223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 03/22/2024] [Accepted: 04/11/2024] [Indexed: 05/24/2024]
Abstract
We exploited 129Xe NMR to investigate xenon gas uptake and dynamics in a porous liquid formed by dissolving porous organic cages in a cavity-excluded solvent. Quantitative 129Xe NMR shows that when the amount of xenon added to the sample is lower than the amount of cages present (subsaturation), the porous liquid absorbs almost all xenon atoms from the gas phase, with 30% of the cages occupied with a Xe atom. A simple two-site exchange model enables an estimate of the chemical shift of 129Xe in the cages, which is in good agreement with the value provided by first-principles modeling. T2 relaxation times allow the determination of the exchange rate of Xe between the solvent and cage sites as well as the activation energies of the exchange. The 129Xe NMR analysis also enables determination of the free energy of confinement, and it shows that Xe binding is predominantly enthalpy-driven.
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Affiliation(s)
- Sarah
E. Mailhiot
- NMR
Research Unit, Faculty of Science, University
of Oulu, P.O.Box 3000, FI-90014 Oulu, Finland
| | - Petri Peuravaara
- NMR
Research Unit, Faculty of Science, University
of Oulu, P.O.Box 3000, FI-90014 Oulu, Finland
| | - Benjamin D. Egleston
- Department
of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, W12 0BZ, U.K.
| | - Rachel J. Kearsey
- Department
of Chemistry and Materials Innovation Factory, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K.
| | - Jiří Mareš
- NMR
Research Unit, Faculty of Science, University
of Oulu, P.O.Box 3000, FI-90014 Oulu, Finland
| | - Sanna Komulainen
- NMR
Research Unit, Faculty of Science, University
of Oulu, P.O.Box 3000, FI-90014 Oulu, Finland
| | - Anne Selent
- NMR
Research Unit, Faculty of Science, University
of Oulu, P.O.Box 3000, FI-90014 Oulu, Finland
| | - Anu M. Kantola
- NMR
Research Unit, Faculty of Science, University
of Oulu, P.O.Box 3000, FI-90014 Oulu, Finland
| | - Andrew I. Cooper
- Department
of Chemistry and Materials Innovation Factory, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K.
| | - Juha Vaara
- NMR
Research Unit, Faculty of Science, University
of Oulu, P.O.Box 3000, FI-90014 Oulu, Finland
| | - Rebecca L. Greenaway
- Department
of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, W12 0BZ, U.K.
| | - Perttu Lantto
- NMR
Research Unit, Faculty of Science, University
of Oulu, P.O.Box 3000, FI-90014 Oulu, Finland
| | - Ville-Veikko Telkki
- NMR
Research Unit, Faculty of Science, University
of Oulu, P.O.Box 3000, FI-90014 Oulu, Finland
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Komulainen S, Roukala J, Zhivonitko VV, Javed MA, Chen L, Holden D, Hasell T, Cooper A, Lantto P, Telkki VV. Inside information on xenon adsorption in porous organic cages by NMR. Chem Sci 2017; 8:5721-5727. [PMID: 28989612 PMCID: PMC5621166 DOI: 10.1039/c7sc01990d] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Accepted: 06/14/2017] [Indexed: 11/21/2022] Open
Abstract
A solid porous molecular crystal formed from an organic cage, CC3, has unprecedented performance for the separation of rare gases. Here, xenon was used as an internal reporter providing extraordinarily versatile information about the gas adsorption phenomena in the cage and window cavities of the material. 129Xe NMR measurements combined with state-of-the-art quantum chemical calculations allowed the determination of the occupancies of the cavities, binding constants, thermodynamic parameters as well as the exchange rates of Xe between the cavities. Chemical exchange saturation transfer (CEST) experiments revealed a minor window cavity site with a significantly lower exchange rate than other sites. Diffusion measurements showed significantly reduced mobility of xenon with loading. 129Xe spectra also revealed that the cage cavity sites are preferred at lower loading levels, due to more favourable binding, whereas window sites come to dominate closer to saturation because of their greater prevalence.
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Affiliation(s)
- Sanna Komulainen
- NMR Research Unit , University of Oulu , P.O.Box 3000 , 90014 Oulu , Finland .
| | - Juho Roukala
- NMR Research Unit , University of Oulu , P.O.Box 3000 , 90014 Oulu , Finland .
| | - Vladimir V Zhivonitko
- Laboratory of Magnetic Resonance Microimaging , International Tomography Center SB RAS , Department of Natural Sciences , Novosibirsk State University , Instututskaya St. 3A, Pirogova St. 2 , 630090 Novosibirsk , Russia
| | | | - Linjiang Chen
- Department of Chemistry , Centre for Materials Discovery , University of Liverpool , Crown Street , Liverpool L69 7ZD , UK
| | - Daniel Holden
- Department of Chemistry , Centre for Materials Discovery , University of Liverpool , Crown Street , Liverpool L69 7ZD , UK
| | - Tom Hasell
- Department of Chemistry , Centre for Materials Discovery , University of Liverpool , Crown Street , Liverpool L69 7ZD , UK
| | - Andrew Cooper
- Department of Chemistry , Centre for Materials Discovery , University of Liverpool , Crown Street , Liverpool L69 7ZD , UK
| | - Perttu Lantto
- NMR Research Unit , University of Oulu , P.O.Box 3000 , 90014 Oulu , Finland .
| | - Ville-Veikko Telkki
- NMR Research Unit , University of Oulu , P.O.Box 3000 , 90014 Oulu , Finland .
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Barbara TM. Nonadiabatic exchange dynamics during adiabatic frequency sweeps. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2016; 265:45-51. [PMID: 26852417 DOI: 10.1016/j.jmr.2016.01.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2015] [Revised: 01/07/2016] [Accepted: 01/08/2016] [Indexed: 06/05/2023]
Abstract
A Bloch equation analysis that includes relaxation and exchange effects during an adiabatic frequency swept pulse is presented. For a large class of sweeps, relaxation can be incorporated using simple first order perturbation theory. For anisochronous exchange, new expressions are derived for exchange augmented rotating frame relaxation. For isochronous exchange between sites with distinct relaxation rate constants outside the extreme narrowing limit, simple criteria for adiabatic exchange are derived and demonstrate that frequency sweeps commonly in use may not be adiabatic with regard to exchange unless the exchange rates are much larger than the relaxation rates. Otherwise, accurate assessment of the sensitivity to exchange dynamics will require numerical integration of the rate equations. Examples of this situation are given for experimentally relevant parameters believed to hold for in-vivo tissue. These results are of significance in the study of exchange induced contrast in magnetic resonance imaging.
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Affiliation(s)
- Thomas M Barbara
- Advanced Imaging Research Center, Oregon Health and Sciences University, Portland, OR 97239, United States.
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Sorce DJ, Mangia S, Liimatainen T, Garwood M, Michaeli S. Exchange-induced relaxation in the presence of a fictitious field. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2014; 245:12-6. [PMID: 24911888 PMCID: PMC4308052 DOI: 10.1016/j.jmr.2014.04.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 04/24/2014] [Accepted: 04/29/2014] [Indexed: 06/03/2023]
Abstract
In the present study we derive a solution for two site fast exchange-induced relaxation in the presence of a fictitious magnetic field as generated by amplitude and frequency modulated RF pulses. This solution provides a means to analyze data obtained from relaxation experiments with the method called RAFFn (Relaxation Along a Fictitious Field of rank n), in which a fictitious field is created in a coordinate frame undergoing multi-fold rotation about n axes (rank n). The RAFF2 technique is relevant to MRI relaxation methods that provide good contrast enhancement for tumor detection. The relaxation equations for n=2 are derived for the fast exchange regime using density matrix formalism. The method of derivation can be further extended to obtain solutions for n>2.
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Affiliation(s)
- Dennis J Sorce
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota Medical School, Minneapolis, MN, USA
| | - Silvia Mangia
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota Medical School, Minneapolis, MN, USA
| | - Timo Liimatainen
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Michael Garwood
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota Medical School, Minneapolis, MN, USA
| | - Shalom Michaeli
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota Medical School, Minneapolis, MN, USA.
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Liimatainen T, Hakkarainen H, Mangia S, Huttunen JMJ, Storino C, Idiyatullin D, Sorce D, Garwood M, Michaeli S. MRI contrasts in high rank rotating frames. Magn Reson Med 2014; 73:254-62. [PMID: 24523028 DOI: 10.1002/mrm.25129] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 12/17/2013] [Accepted: 12/20/2013] [Indexed: 11/10/2022]
Abstract
PURPOSE MRI relaxation measurements are performed in the presence of a fictitious magnetic field in the recently described technique known as RAFF (Relaxation Along a Fictitious Field). This method operates in the 2(nd) rotating frame (rank n = 2) by using a nonadiabatic sweep of the radiofrequency effective field to generate the fictitious magnetic field. In the present study, the RAFF method is extended for generating MRI contrasts in rotating frames of ranks 1 ≤ n ≤ 5. The developed method is entitled RAFF in rotating frame of rank n (RAFFn). THEORY AND METHODS RAFFn pulses were designed to generate fictitious fields that allow locking of magnetization in rotating frames of rank n. Contrast generated with RAFFn was studied using Bloch-McConnell formalism together with experiments on human and rat brains. RESULTS Tolerance to B0 and B1 inhomogeneities and reduced specific absorption rate with increasing n in RAFFn were demonstrated. Simulations of exchange-induced relaxations revealed enhanced sensitivity of RAFFn to slow exchange. Consistent with such feature, an increased grey/white matter contrast was observed in human and rat brain as n increased. CONCLUSION RAFFn is a robust and safe rotating frame relaxation method to access slow molecular motions in vivo.
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Affiliation(s)
- Timo Liimatainen
- A.I.Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Hanne Hakkarainen
- A.I.Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Silvia Mangia
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, USA
| | - Janne M J Huttunen
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
| | - Christine Storino
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, USA
| | - Djaudat Idiyatullin
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, USA
| | - Dennis Sorce
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, USA
| | - Michael Garwood
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, USA
| | - Shalom Michaeli
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, USA
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Mitsumori F, Watanabe H, Takaya N, Garwood M, Auerbach EJ, Michaeli S, Mangia S. Toward understanding transverse relaxation in human brain through its field dependence. Magn Reson Med 2012; 68:947-53. [PMID: 22161735 PMCID: PMC3424402 DOI: 10.1002/mrm.23301] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 10/24/2011] [Accepted: 10/26/2011] [Indexed: 12/23/2022]
Abstract
Apparent transverse-relaxation rate constants (R₂⁺ = 1/T₂⁺) were measured in various regions of the healthy human brain using a multiecho adiabatic spin-echo sequence at five different magnetic fields, 1.5, 1.9, 3, 4.7, and 7 T. The R₂⁺ values showed a clear dependence on magnetic field strength (B(0) ). The regional distribution of the R ₂⁺ was well explained by the sum of three components: (1) regional nonhemin iron concentration ([Fe]), (2) regional macromolecular mass fraction (f(M) ), and (3) a region-independent factor. Accordingly, R₂⁺ = α[Fe] + βf(M) + γ, where coefficients α, β, and γ were experimentally determined at each magnetic field by a least square fitting method using multiple regression analysis. Although the coefficient α linearly increased with B(0) , β showed a quadratic dependence on top of a field-independent component. The coefficient γ also increased slightly with B(0) on top of a field-independent component. The linear dependence of α on B(0) was consistent with that observed for the transverse-relaxation rate of water protons in ferritin solutions as found previously by others. The quadratic dependence of β on B(0) was accounted for by isochronous and anisochronous exchange mechanisms using intrinsic-relaxation parameters obtained from the literature.
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Traaseth NJ, Chao FA, Masterson LR, Mangia S, Garwood M, Michaeli S, Seelig B, Veglia G. Heteronuclear Adiabatic Relaxation Dispersion (HARD) for quantitative analysis of conformational dynamics in proteins. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2012; 219:75-82. [PMID: 22621977 PMCID: PMC3568944 DOI: 10.1016/j.jmr.2012.03.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2011] [Revised: 03/22/2012] [Accepted: 03/29/2012] [Indexed: 05/09/2023]
Abstract
NMR relaxation methods probe biomolecular motions over a wide range of timescales. In particular, the rotating frame spin-lock R(1ρ) and Carr-Purcell-Meiboom-Gill (CPMG) R(2) experiments are commonly used to characterize μs to ms dynamics, which play a critical role in enzyme folding and catalysis. In an effort to complement these approaches, we introduced the Heteronuclear Adiabatic Relaxation Dispersion (HARD) method, where dispersion in rotating frame relaxation rate constants (longitudinal R(1ρ) and transverse R(2ρ)) is created by modulating the shape and duration of adiabatic full passage (AFP) pulses. Previously, we showed the ability of the HARD method to detect chemical exchange dynamics in the fast exchange regime (k(ex)∼10(4)-10(5) s(-1)). In this article, we show the sensitivity of the HARD method to slower exchange processes by measuring R(1ρ) and R(2ρ) relaxation rates for two soluble proteins (ubiquitin and 10C RNA ligase). One advantage of the HARD method is its nominal dependence on the applied radio frequency field, which can be leveraged to modulate the dispersion in the relaxation rate constants. In addition, we also include product operator simulations to define the dynamic range of adiabatic R(1ρ) and R(2ρ) that is valid under all exchange regimes. We conclude from both experimental observations and simulations that this method is complementary to CPMG-based and rotating frame spin-lock R(1ρ) experiments to probe conformational exchange dynamics for biomolecules. Finally, this approach is germane to several NMR-active nuclei, where relaxation rates are frequency-offset independent.
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Affiliation(s)
- Nathaniel J. Traaseth
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, United States
- Department of Chemistry, New York University, New York, NY 10003, United States
| | - Fa-An Chao
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, United States
| | - Larry R. Masterson
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, United States
| | - Silvia Mangia
- Department of Radiology (Center for Magnetic Resonance Research), University of Minnesota, Minneapolis, MN 55455, United States
| | - Michael Garwood
- Department of Radiology (Center for Magnetic Resonance Research), University of Minnesota, Minneapolis, MN 55455, United States
| | - Shalom Michaeli
- Department of Radiology (Center for Magnetic Resonance Research), University of Minnesota, Minneapolis, MN 55455, United States
| | - Burckhard Seelig
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, United States
- BioTechnology Institute, University of Minnesota, St. Paul, MN 55108, United States
| | - Gianluigi Veglia
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, United States
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, United States
- Corresponding author. Address: 6-155 Jackson Hall, 321 Church St. SE, Minneapolis, MN 55455, United States. Fax: +1 612 625 2163. (G. Veglia)
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Viswanathan S, Kovacs Z, Green KN, Ratnakar SJ, Sherry AD. Alternatives to gadolinium-based metal chelates for magnetic resonance imaging. Chem Rev 2010; 110:2960-3018. [PMID: 20397688 PMCID: PMC2874212 DOI: 10.1021/cr900284a] [Citation(s) in RCA: 313] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Subha Viswanathan
- Advanced Imaging Research Center, UT Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390 and Department of Chemistry, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080
| | - Zoltan Kovacs
- Advanced Imaging Research Center, UT Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390 and Department of Chemistry, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080
| | - Kayla N. Green
- Advanced Imaging Research Center, UT Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390 and Department of Chemistry, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080
| | - S. James Ratnakar
- Advanced Imaging Research Center, UT Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390 and Department of Chemistry, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080
| | - A. Dean Sherry
- Advanced Imaging Research Center, UT Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390 and Department of Chemistry, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080
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Szalay Z, Rohonczy J. Monte Carlo simulation of NMR lineshapes in chemically exchanging spin systems. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2010; 56:198-216. [PMID: 20633351 DOI: 10.1016/j.pnmrs.2009.09.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2009] [Accepted: 09/25/2009] [Indexed: 05/29/2023]
Affiliation(s)
- Zsófia Szalay
- Department of Inorganic Chemistry, Institute of Chemistry, Eötvös Loránd University, H-1518 Budapest 112, Pf: 32, Hungary
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Vinogradov E, Zhang S, Lubag A, Balschi JA, Sherry AD, Lenkinski RE. On-resonance low B1 pulses for imaging of the effects of PARACEST agents. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2005; 176:54-63. [PMID: 15979362 DOI: 10.1016/j.jmr.2005.05.016] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2005] [Revised: 05/08/2005] [Accepted: 05/18/2005] [Indexed: 05/03/2023]
Abstract
Application of the exchange-sensitive, low-power RF pulses positioned on the bulk water resonance for imaging of the effects of PARACEST agents is proposed as an alternative to the standard CW off-resonance irradiation. Specifically, we applied a low-power WALTZ-16 RF train, with the 90 degrees pulse unit replaced by a pulse of the fixed length (WALTZ-16*). Using this sequence, the bulk water signal was found to be sensitive to exchange lifetimes with PARACEST complex bound protons, the transverse relaxation time of bulk water, and longitudinal relaxation time of bound protons. In this report, the concept of using WALTZ-16* to "activate" a PARACEST effect is introduced and some of the salient features of this technique with respect to experimental conditions and performance levels are discussed. Computational predictions are verified and explored by comparison with experimental spectroscopic and imaging data. It is shown that WALTZ-16* can be used to detect PARACEST agents with an RF intensity as low as 200 Hz for concentrations as low as a few tens of microM for lanthanide chelates having appropriate water-exchange rates (Tm,Dy).
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Affiliation(s)
- Elena Vinogradov
- Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, USA.
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