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1 ium salts and trace amounts of corresponding nitroxide.
2 he modified Taft steric constant E(s) of the nitroxide.
3 uires a paramagnetic spin catalyst such as a nitroxide.
4 ent for the neutral and charged forms of the nitroxide.
5 n reacted with an iodomethyl derivative of a nitroxide.
6 adical to the oxoammonium ion to re-form the nitroxide.
7 a peroxyl radical to eventually re-form the nitroxide.
8 n alkyl bromide and a hydroxy-functionalized nitroxide.
9 radical that is spin-trapped in situ by the nitroxide.
10 ed reversible redox behavior for all studied nitroxides.
11 toolset for the predictive design of pyridyl nitroxides.
12 ompared to corresponding 2,2,5,5-tetramethyl nitroxides.
13 es were much more reactive than the backbone nitroxides.
14 ning of both the 15N-labeled and 14N-labeled nitroxides.
15 res efficient site-specific incorporation of nitroxides.
16 eased in the manner usually observed for bis-nitroxides.
18 hydrophilic tetracarboxylate ester pyrroline nitroxides 1 and 2, which serve as models in the search
21 of the probe methyl resonances to the stable nitroxide, 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxy
24 r a variety of structural diversity, such as nitroxide 9,that can, for instance, target tissue compar
25 hyperfine coupling constant of the released nitroxide a(N,SG1), meaning that the stabilization of th
26 raction between the 15N-labeled incarcerated nitroxide and a 14N-labeled free nitroxide in the extern
28 (*) radical is connected to the PDI with the nitroxide and imide nitrogen atoms either para (1) or me
30 X-ray diffraction analysis of both nitronyl nitroxide and iminonitroxide revealed a complete match o
31 and shifts the equilibrium in the mixture of nitroxide and reference hydroxylamine (3-carboxy-1-hydro
32 larity of both the incarcerated paramagnetic nitroxide and the nitroxides in the external bulk aqueou
36 ing to the formation of the respective imino nitroxides and hydroxylamines via a complex mechanism.
37 charged guest@host complex (incarcerated 15N nitroxide) and charged molecules in the aqueous phase.
38 f FA, we examined the potential of tempol, a nitroxide antioxidant and a superoxide dismutase mimetic
43 denoting that the oxidant properties of the nitroxides are determined by steric and electronic effec
44 lamine increases at the expense of the imino nitroxide as the ratio [AS](0)/[nitronyl nitroxide](0) i
47 behavior in a thermally unswitchable copper-nitroxide based molecular magnet Cu(hfac)2L(i-Pr) paves
50 view of this finding, we synthesized two new nitroxides bearing an exocyclic double bond: 4-methoxyca
51 e, and paracetamol were impregnated with bis-nitroxide biradical (bis-cyclohexyl-TEMPO-bisketal, bCTb
53 diradicals may be associated with the methyl nitroxide C-H- - -O contacts, including nonclassical hyd
55 the corresponding imino nitroxide, nitronyl nitroxide can discriminate NO from HNO only when present
56 ance (EPR) of biomolecules spin-labeled with nitroxides can offer uniquely sensitive and selective in
57 Rotation of gem-dimethyls in commonly used nitroxides causes spin echo dephasing times (Tm) to be t
58 ablished cardioprotectant, dexrazoxane, or a nitroxide conjugated to a triphenylphosphonium cation, M
59 imidazol-3-oxide- 1-oxyl (3), a new nitronyl nitroxide containing a multifunctional framework of stro
62 curacy of pKa determination for pH-sensitive nitroxides could be achieved regardless of the frequency
63 the nitroxide-m-phenylene-CH(2)-m-phenylene-nitroxide coupling pathway, and through-space coupling i
64 lso explore alternative mechanisms for amine/nitroxide cycling for cases where the alkoxyamines do no
65 hat might, potentially, be involved in amine/nitroxide cycling, as well as several novel pathways pro
66 aspect of these studies is that both Cu(2+)/nitroxide DEER at cryogenic temperatures and T1 relaxati
69 nd evaluation of a series of furanyl-salicyl-nitroxide derivatives as effective chemical probes for s
71 the octamethyl derivative of benzobisoxazine nitroxide diradical, the conformationally constrained ni
76 esonance data yield Cu(2+)-Cu(2+) and Cu(2+)-nitroxide distances that are uniquely consistent with on
77 for the R1 relaxation rate, suggesting that nitroxide dynamics remain coupled to the backbone on mem
78 ine variants of N-PGK were labelled with the nitroxide electron spin-label MTSL [(1-oxyl-2,2,5,5-tetr
80 id) (ABTS(+)) radical, as well as the stable nitroxide free radical 4-hydroxy-2,2,6,6-tetramethylpipe
83 The direct (13)C NMR and EPR spectra of the nitroxide free radicals and the oxoammonium salts, along
85 t as 63 nanoseconds, in a frozen solution of nitroxide free-radicals at temperatures as high as 190 k
86 allowing the preparation of a library of the nitroxide functionalized pyrazolines and corresponding m
87 ajor contributions to the x-component of the nitroxide g-matrix: hydrogen-bond formation and local el
88 up bulky spirocyclic moieties adjacent to a nitroxide group and provides an important supplementatio
91 yclic C(2)-symmetric chiral pyrrolidine-type nitroxide has been successfully synthesized starting fro
92 sion were observed, with the presence of the nitroxide having no significant impact on the cycloaddit
93 d attitude of the scalar interaction for the nitroxide hydrogen bonding at the methyl group in CH3CN
95 ncarcerated nitroxide and a 14N-labeled free nitroxide in the external aqueous solution was observed
96 spiro dinitroxide biradicals that orient the nitroxides in a rigid, approximately orthogonal geometry
97 surements of local hydration dynamics around nitroxides in bulk water and on the surface of proteins
98 ed the oxidation potential of the respective nitroxides in comparison to electron-donating groups.
101 escence is partially quenched by surrounding nitroxides in the native state; exposure to ascorbate or
102 he distribution of distances between the two nitroxides in the peptides when in solution and when bou
103 redox status." The preferential reduction of nitroxides in tumors compared with normal tissue was obs
105 y that for both systems triplet quenching by nitroxide induces spin polarization of the radical spin
108 paramagnetic resonance imaging (EPRI) using nitroxides is an emergent imaging method for studying in
109 -PTIO), which yields the corresponding imino nitroxides, is widely used for NO detection (mainly by e
110 e inner loop (residues 401-413), and the EPR nitroxide label revealed ligand-induced conformational d
115 ported here presents a new method for facile nitroxide labeling at the 5' terminus of nucleic acids o
118 ane that is characterized by the presence of nitroxide labels both at the wheel and at the dumbbell.
121 evealed location-dependent reactivity of the nitroxide labels: peripheral nitroxides were much more r
122 trates that HNO readily reacts with nitronyl nitroxides, leading to the formation of the respective i
125 to find a globally minimized arrangement of nitroxide locations that simultaneously satisfied the cr
126 jacent nitroxide radicals is mediated by the nitroxide-m-phenylene-CH(2)-m-phenylene-nitroxide coupli
127 n electrostatic potential through changes in nitroxide magnetic parameters and the degree of rotation
128 ate that this fully isotopically substituted nitroxide markedly improves signal-to-noise ratio and, t
129 n relaxation parameters demonstrate that new nitroxides may be suitable for PELDOR distance measureme
130 formation of alkoxyamines on the fate of the nitroxide-mediated polymerization (NMP) of styrene.
136 a of the resulting K1 mutants reflect higher nitroxide mobilities than the spectra of analogous mutan
137 diradical, the conformationally constrained nitroxide moieties are coplanar with the m-phenylene, le
138 exchange interaction between the trityl and nitroxide moieties determines the magnetic field at whic
139 e are sterically shielded, distortion of the nitroxide moieties from coplanarity is moderate, such th
142 ing that increasing the distance between the nitroxide moiety and methyl groups is effective in lengt
143 ants for collisional quenching of Trp by the nitroxide moiety are approximately 1 / 5 x 10(12) M(-1)
144 In site-directed spin labeling (SDSL), a nitroxide moiety containing a stable, unpaired electron
146 es (ROS) was measured using a profluorescent nitroxide molecular probe 9-(1,1,3,3-tetramethylisoindol
147 ork has established that stable paramagnetic nitroxide molecules are excellent probes of intermolecul
149 itroxide yields only the corresponding imino nitroxide, nitronyl nitroxide can discriminate NO from H
152 ly blue-colored Ullman imidazolinyl nitronyl nitroxide (NN) mono-radicals have found various applicat
155 ascorbate than spirocyclohexane-substituted nitroxides of piperidine series and showed 1.3-3.14 time
156 ly manipulate the oxidizing power of surface nitroxide/oxoammonium redox couple, hence showing the pr
157 he gramicidin segment was used to target the nitroxide payload to mitochondria because antibiotics of
158 310-helical conformation with both nitronyl nitroxide pendants positioned on the same side of the he
159 ,SG1), meaning that the stabilization of the nitroxide played an important role in C-ON bond homolysi
160 th microwaves in the presence of typical bis-nitroxide polarizing agents is utilized for steady-state
161 gh power battery electrodes by hybridizing a nitroxide-polymer redox supercapacitor (PTMA) with a Li-
162 atives were synthesized, each containing the nitroxide probe 2,2,6,6-tetramethyl-piperidine-1-oxyl-4-
163 -RE, measured using a nucleotide-independent nitroxide probe and double-electron-electron-resonance s
164 irected spin labeling, a covalently attached nitroxide probe containing a chemically inert unpaired e
165 nanometer distances in nucleic acids using a nitroxide probe that can be attached to any nucleotide w
166 es SDSL distance measurements in RNA using a nitroxide probe, designated as R5, which is attached in
168 ctural and dynamic features using a class of nitroxide probes that are linked to chemically substitut
171 ved alkyl radical with a diarylamine-derived nitroxide-proceeds by different mechanisms depending on
173 hed to the cytoplasmic domain of CLS and the nitroxide quencher attached to the lipid bilayer, we sho
174 nthesized two series of compounds in which a nitroxide radical and a fullerene C(60) moiety were kept
175 ements larger than 10 were obtained with bis-nitroxide radical at 14.1 T and low temperature ( approx
176 e examine a family of polythiophenes bearing nitroxide radical groups, showing that while both specie
177 ected spin labeling (SDSL) utilizes a stable nitroxide radical to obtain structural and dynamic infor
179 ad portion of XJB-5-131 consists of a stable nitroxide radical, which has been extensively investigat
181 arization of solvent molecules that approach nitroxide radical-based spin labels within <5-10 A.
188 space coupling is found between the diagonal nitroxide radicals at the conformationally constrained N
189 recent reports that the coupling factor for nitroxide radicals cannot be quantified due to the diffi
190 TEMPO oxoammonium salts and three homologous nitroxide radicals have been prepared and characterized.
191 Through-bond coupling between the adjacent nitroxide radicals is mediated by the nitroxide-m-phenyl
192 cleotide-independent labeling scheme, stable nitroxide radicals were attached to eight specific pRNA
193 pening metathesis polymerization (ROMP), and nitroxide radicals were incorporated at three different
197 es cysteine residues and sulfhydryl-reactive nitroxide reagents, can be challenging for proteins that
198 ascorbate or ascorbate/glutathione leads to nitroxide reduction and a concomitant 2- to 3.5-fold inc
202 t the very beginning of the irradiation; the nitroxide resulting from the trapping of propargyl radic
203 tereomers (R(p) or S(p)) were separated, and nitroxide rotational motions were monitored using electr
204 tic resonance (EPR) spectra, which report on nitroxide rotational motions, were found to vary dependi
210 investigate the structure of the tetramer, a nitroxide side chain (R1) was introduced at 18 different
212 electron paramagnetic resonance spectra of a nitroxide side chain placed at position 85 or 409 of the
213 directed spin labeling of Ser(155)Cys with a nitroxide side chain, we detected a change in conformati
215 of helices rather than rearrangement of the nitroxide side chains are responsible for observed dista
216 tances and distance changes between pairs of nitroxide side chains introduced in helices at the cytop
217 al structure but EPR spectroscopy studies of nitroxide side chains placed at selected sites on annexi
219 nce quantum yield between the profluorescent nitroxide species and their nonradical adducts provides
224 eta42) to an alternative sequence in which a nitroxide spin label attached to cysteine has been intro
226 lectron paramagnetic resonance spectrum of a nitroxide spin label can be obtained from the Fourier tr
227 xcited porphyrin triplet state (S = 1) and a nitroxide spin label chemically incorporated into a smal
228 a measurement of 140 amol of the most common nitroxide spin label in a approximately 593 fL liquid ce
229 detected by EPR as a change in mobility of a nitroxide spin label positioned near the maltose-binding
231 ectroscopy shows that rotational motion of a nitroxide spin label, placed at the N-terminal end of th
234 li, has been carried out using site directed nitroxide spin labeling (SDSL) of cysteine residues.
236 ling technology has enabled the insertion of nitroxide spin labels at positions on the surface of the
237 vative of nonaribonucleotide pUUCGUAAAA with nitroxide spin labels attached to the 5'-phosphate and t
238 magnetic resonance detection and imaging of nitroxide spin labels in an individual macromolecule to
239 ements are the instabilities of the standard nitroxide spin labels in the cell environment and the li
240 d by the short lifetime of the commonly used nitroxide spin labels in the reducing milieu inside a ce
241 osition and sample temperature indicate that nitroxide spin labels on the exterior surface of BtuB, w
242 ibrium distribution of distances between two nitroxide spin labels rigidly attached to the helices of
243 oscopy was used to measure distances between nitroxide spin labels strategically placed in dimeric An
244 placed, site-specifically attached pairs of nitroxide spin labels to monitor changes in the mini TAR
246 e-helical collagen V mimic (synthesized with nitroxide spin labels) in the active site of the catalyt
248 proximately 7 nm between introduced pairs of nitroxide spin labels, we show that distances are close
249 those observed previously in the presence of nitroxide spin labels, while this phenomenon is signific
252 electron spin resonance from a T (1) = 1 ms nitroxide spin probe in a thin film at 4.2 K and 0.6 T.
253 at 236.6 and 9.5 GHz probed the tumbling of nitroxide spin probes in the lower stem, in the upper lo
256 om representation of the covalently attached Nitroxide spin-label and virtual "solvent" particles cor
258 d spin labeling by resolving rotamers of the nitroxide spin-label side chain in a variety of alpha-he
265 nvestigate more carefully the effects of the nitroxide structure on the re-formation rate constant k(
267 The unique reaction of NO with nitronyl nitroxides such as 2-(4-carboxyphenyl)-4,4,5,5-tetrameth
270 IMTSL-PTE) containing a reversibly ionizable nitroxide tag attached to the lipids' polar headgroup.
272 a paramagnetic catalyst (dissolved O2 or the nitroxide Tempo) a slow back conversion into oH2@C60 was
273 agents referred to as TEMTriPols, in which a nitroxide (TEMPO) and a trityl radical are chemically te
274 (-/-) mice a diet supplemented with a stable nitroxide, Tempol, and showed that the progression of ne
275 xchange-coupled biradicals, e.g., the trityl-nitroxides (TNs), possess particular magnetic properties
276 We reasoned that targeting a redox cycling nitroxide to mitochondria could prevent reactive oxygen
277 (*)NO(2) oxidizes the nitronyl and imino nitroxides to their respective oxoammonium cations, whic
279 mmon families of persistent organic radicals-nitroxide, triphenylmethyl, verdazyl, phenalenyl, and di
281 echanically blocked on a thread containing a nitroxide unit by a Cu(I) catalyzed azide-alkyne cycload
282 pling between the two mechanically connected nitroxide units and were analyzed by a model assuming th
283 avenue for the preparation of profluorescent nitroxides via nitrile imine-mediated tetrazole-ene cycl
284 bility of obtaining multifunctional nitronyl nitroxides via the interaction of paramagnetic lithium d
286 ckbone dynamics could be mapped with SDSL, a nitroxide was introduced at 55 independent sites in a mo
287 loping a framework for designing narrow-line nitroxides, we sought to understand the unexpectedly nar
289 activity of the nitroxide labels: peripheral nitroxides were much more reactive than the backbone nit
290 Importantly, the pyrazoline profluorescent nitroxides were shown to efficiently act as sensors for
291 -350) revealed greater immobilization of the nitroxide when compared to that of the N-terminally modi
292 m involving the acid-catalyzed reaction of a nitroxide with a peroxyl radical to yield an oxoammonium
293 c cycle involving the rapid combination of a nitroxide with an alkyl radical to yield an alkoxyamine
294 d by switching the position of fullerene and nitroxide with respect to the peptide nitrogen and carbo
295 d utilizing the reaction of a profluorescent nitroxide with the B-n-butylcatecholboronate ester forme
296 ed by electron interchange reactions between nitroxides with an N-acetyl substituent and oxoammonium
298 (c) values of the cross-coupling reaction of nitroxides with tert-butoxylcarbonyl-2-prop-2-yl radical
300 suring dipolar interactions between pairs of nitroxides yields internitroxide distances, from which q
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