james ratnakar
james ratnakar
Research scientist
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Alternatives to gadolinium-based metal chelates for magnetic resonance imaging
S Viswanathan, Z Kovacs, KN Green, SJ Ratnakar, AD Sherry
Chemical reviews 110 (5), 2960-3018, 2010
A concentration‐independent method to measure exchange rates in PARACEST agents
WT Dixon, J Ren, AJM Lubag, J Ratnakar, E Vinogradov, I Hancu, ...
Magnetic resonance in medicine 63 (3), 625-632, 2010
A new gadolinium-based MRI zinc sensor
AC Esqueda, JA López, G Andreu-de-Riquer, JC Alvarado-Monzón, ...
Journal of the American Chemical Society 131 (32), 11387-11391, 2009
Europium (III) DOTA-tetraamide complexes as redox-active MRI sensors
SJ Ratnakar, S Viswanathan, Z Kovacs, AK Jindal, KN Green, AD Sherry
Journal of the American Chemical Society 134 (13), 5798-5800, 2012
BDPA: An Efficient Polarizing Agent for Fast Dissolution Dynamic Nuclear Polarization NMR
L Lumata, SJ Ratnakar, A Jindal, M Merritt, A Comment, C Malloy, ...
Chemistry (Weinheim an der Bergstrasse, Germany) 17 (39), 10825, 2011
Modulation of water exchange in europium (III) DOTA− tetraamide complexes via electronic substituent effects
SJ Ratnakar, M Woods, AJM Lubag, Z Kovács, AD Sherry
Journal of the American Chemical Society 130 (1), 6-7, 2008
Redox‐and hypoxia‐responsive MRI contrast agents
QN Do, JS Ratnakar, Z Kovács, AD Sherry
ChemMedChem 9 (6), 1116-1129, 2014
A multislice gradient echo pulse sequence for CEST imaging
WT Dixon, I Hancu, SJ Ratnakar, AD Sherry, RE Lenkinski, DC Alsop
Magnetic Resonance in Medicine: An Official Journal of the International …, 2010
Modulation of CEST Images in Vivo by T1 Relaxation: A New Approach in the Design of Responsive PARACEST Agents
SJ Ratnakar, TC Soesbe, LL Lumata, QN Do, S Viswanathan, CY Lin, ...
Journal of the American Chemical Society 135 (40), 14904-14907, 2013
Production and NMR characterization of hyperpolarized 107,109 Ag complexes
L Lumata, M Merritt, Z Hashami, SJ Ratnakar, Z Kovacs
Angewandte Chemie (International ed. in English) 51 (2), 525, 2012
Multi-frequency PARACEST agents based on europium (III)-DOTA-tetraamide ligands
S Viswanathan, SJ Ratnakar, KN Green, Z Kovacs, ...
Angewandte Chemie (International ed. in English) 48 (49), 9330, 2009
The efficiency of DPPH as a polarising agent for DNP-NMR spectroscopy
L Lumata, M Merritt, C Khemtong, SJ Ratnakar, J Van Tol, L Yu, L Song, ...
RSC advances 2 (33), 12812-12817, 2012
Maximizing T2‐exchange in Dy3+DOTA‐(amide)X chelates: Fine‐tuning the water molecule exchange rate for enhanced T2 contrast in MRI
TC Soesbe, SJ Ratnakar, M Milne, S Zhang, QN Do, Z Kovacs, AD Sherry
Magnetic resonance in medicine 71 (3), 1179-1185, 2014
Activation of a PARACEST agent for MRI through selective outersphere interactions with phosphate diesters
CH Huang, J Hammell, SJ Ratnakar, AD Sherry, JR Morrow
Inorganic chemistry 49 (13), 5963-5970, 2010
Oxidative Conversion of a Europium(II)‐Based T1 Agent into a Europium(III)‐Based paraCEST Agent that can be Detected In Vivo by Magnetic Resonance Imaging
AM Funk, V Clavijo Jordan, AD Sherry, SJ Ratnakar, Z Kovacs
Angewandte Chemie 128 (16), 5108-5111, 2016
Using frequency‐labeled exchange transfer to separate out conventional magnetization transfer effects from exchange transfer effects when detecting ParaCEST agents
CY Lin, NN Yadav, JI Friedman, J Ratnakar, AD Sherry, PCM Van Zijl
Magnetic resonance in medicine 67 (4), 906-911, 2012
Synthesis and Relaxivity Studies of a Gadolinium(III) Complex of ATP‐Conjugated DO3A as a Contrast Enhancing Agent for MRI
SJ Ratnakar, V Alexander
European journal of inorganic chemistry 2005 (19), 3918-3927, 2005
Manganese (II)-based responsive contrast agent detects glucose-stimulated zinc secretion from the mouse pancreas and prostate by MRI
S Chirayil, VC Jordan, AF Martins, N Paranawithana, SJ Ratnakar, ...
Inorganic chemistry 60 (4), 2168-2177, 2021
Engineering a pH‐sensitive liposomal MRI agent by modification of a bacterial channel
LM Yang, H Zheng, JS Ratnakar, BY Adebesin, QN Do, Z Kovacs, ...
Small 14 (19), 1704256, 2018
A frequency‐selective pH‐responsive paraCEST agent
SJ Ratnakar, S Chirayil, AM Funk, S Zhang, JF Queiró, CFGC Geraldes, ...
Angewandte Chemie International Edition 59 (48), 21671-21676, 2020
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