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Novel Molecular Tags Permit More Versatile Bioimaging

By MedImaging International staff writers
Posted on 10 Apr 2016
Image: 15N2-diazirine molecular tags formed by a newly developed catalyst and hydrogen (Photo courtesy of Duke University).
Image: 15N2-diazirine molecular tags formed by a newly developed catalyst and hydrogen (Photo courtesy of Duke University).
A new study describes a class of molecular tags that enhance magnetic resonance imaging (MRI) signals, and could enable widespread real time monitoring of metabolic processes in cancer and heart disease.

Researchers at Duke University (Durham, NC, USA) have succeeded in developing a cost-efficient method to directly hyperpolarize long-lived nuclear spin states on universal 15N2-diazirine molecular tags. Named SABRE-SHEATH, the technique results in a higher than 10,000-fold enhancement in the generation detectable nuclear MR signals, that can also last much longer. The 15N2-diazirines are biocompatible, inexpensive to produce, and can be incorporated into a wide range of biomolecules without significantly altering molecular function.

Current hydrogen-based hyperpolarization techniques result in agents visible for only seconds, and thus cannot monitor the majority of biological processes. The 15N2-diazirine molecular tags, on the other hand, are composed of two nitrogen atoms bound together in a ring, a geometry that traps hyperpolarization in a state that does not relax quickly, thus greatly enhancing magnetic resonance signals for over an hour. An added advantage is that it can be tagged on small molecules, macro molecules, and amino acids, without changing the intrinsic properties of the original compound. The study was published in the March 25, 2016, issue of Science Advances.

“This represents a completely new class of molecules that doesn't look anything at all like what people thought could be made into MRI tags,” said senior author Professor Warren S. Warren, PhD, chair of Physics at Duke. “We envision it could provide a whole new way to use MRI to learn about the biochemistry of disease. In a minute, you've made the hyperpolarized agent, and on the fly you could actually take an image. That is something that is simply inconceivable by any other method.”

The hyperpolarized state is a very low spin temperature state that is not in a thermal equilibrium with the temperature of the sample. Low spin temperature leads to high magnetization of the spin ensemble, resulting in very high nuclear MRI signal. This spin state eventually returns to the thermal equilibrium temperature (depolarization).

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98 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (68.902969360352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
105 (64.13459777832): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
106 (87.976455688477): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294763627 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (62.942504882812): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294763627 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (98.943710327148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
109 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
110 (74.148178100586): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294763627 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (606.06002807617): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294763627 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (792.02651977539): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
113 (588.89389038086): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (164.03198242188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
115 (158.07151794434): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
116 (99.897384643555): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
117 (59.127807617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
118 (105.14259338379): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
119 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
120 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
121 (49.829483032227): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
122 (460.86311340332): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 30618.906021118): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
124 (793.9338684082): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294763627 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294763627 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 10812.997817993): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
126 (92.029571533203): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (56.982040405273): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
128 (40.054321289062): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (79.154968261719): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
130 (40.054321289062): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (444.88906860352): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
132 (63.896179199219): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (55.074691772461): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
134 (40.054321289062): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (627.04086303711): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (458.0020904541): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (300.88424682617): SELECT name FROM jos_deeppockets WHERE id=212
138 (49.114227294922): SELECT name FROM jos_deeppockets WHERE id=212
139 (885.009765625): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (761.98577880859): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (102.99682617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
142 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
143 (!!!!! 16555.070877075): TRUNCATE TABLE jos_trademed_module
144 (123.97766113281): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294763627 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (64.13459777832): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294763627 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (683.06922912598): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (107.0499420166): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
149 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
150 (!!!!! 1611.9480133057): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
151 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
152 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
153 (41.961669921875): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294763627 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294763627 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (38.14697265625): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
155 (36.001205444336): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
156 (36.001205444336): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (81.777572631836): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
158 (53.882598876953): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294763627 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294763627 AND published='1' LIMIT 1
159 (43.153762817383): select jos_twitters.link from jos_twitters where cat=10
160 (34.093856811523): select jos_facebook.link from jos_facebook where cat=10
161 (34.093856811523): select jos_google_plus.link from jos_google_plus where cat=10
162 (33.855438232422): select jos_linkedin.link from jos_linkedin where cat=10
163 (369.78721618652): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1353.9791107178): insert into jos_banners_delta values (14615,'2025-06-20 23:11:15','216.73.216.120','view'),(14202,'2025-06-20 23:11:15','216.73.216.120','view'),(14203,'2025-06-20 23:11:15','216.73.216.120','view')