Alex I. Smirnov

North Carolina State University

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Tatyana I. Smirnova

North Carolina State University

Maxim A. Voinov

North Carolina State University

Antonín Marek

North Carolina State University

Sergey Milikisiyants

North Carolina State University

R. Linn Belford

University of Illinois Urbana-Champaign

V. N. Glazkov

P.L. Kapitza Institute for Physical Problems

A. Ya. Shapiro

A.V. Shubnikov Institute of Crystallography

R.B. Clarkson

Culham Science Centre

J. Krim

North Carolina State University

L. A. Prozorova

P.L. Kapitza Institute for Physical Problems

Cooperative Institutions

Russian Academy of Sciences

120

North Carolina State University

110

Centre National de la Recherche Scientifique

Institute of Applied Physics

University of Illinois Urbana-Champaign

University of North Carolina at Chapel Hill

P.L. Kapitza Institute for Physical Problems

Lomonosov Moscow State University

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

North Central State College

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Psychotropic Utilization and Psychiatric Presentation of Hospitalized Very Young Children

Journal of Child and Adolescent Psychopharmacology (2004)

Sanjeev Pathak Sarah P. Arszman Arman Danielyan Erin S. Johns Alex I. Smirnov

Background: Despite the growth in use of psychotropics in preschoolers, little information is available about the clinical characteristics of very young children who receive psychotropics. No information, specific to young children, is available about the prescribing practices of physicians with the most extensive training in child psychopharmacology, i.e., child psychiatrists. Objective: The aim of this study was to examine the prevalence and nature of psychotropics prescribed by child psychiatrists to very young children with severe functional impairment secondary to psychiatric pathology, and to examine the clinical context in which these psychotropics were prescribed. Methods: The medical charts of 93 children, who were admitted consecutively to a psychiatric unit and who were less than 7 years old, were retrospectively reviewed. Results: The children (mean age, 5.4 ± 1.1 years) had a high rate of exposure to abuse or trauma (64.5%). Functional impairment, as measured on the Clinical Global Assessment Scale (CGAS), was high (mean score, 14.4 ± 6.7). Most children (78.5%) received psychotropics during the admission. Children were prescribed antipsychotics (50.6%), psychostimulants (41.9%), and antidepressants (36.6%). Of those on psychotropics, the majority (68.5%) were on 2 or more psychotropics. Conclusions: This naturalistic, retrospective study suggests that psychotropics are commonly prescribed to very young children with extremely severe psychopathology and who are in need of inpatient care. Clinical safety and efficacy trials of these agents in very young children are needed.

10.1089/1044546042389217

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Beauty beyond the Eye: Color Centers in Diamond Particles for Imaging and Quantum Sensing Applications

Reviews and Advances in Chemistry (2022)

Nicholas Nunn Marco D. Torelli Ashok Ajoy Alex I. Smirnov Olga Shenderova

Quantum sensor

Synthetic diamond

10.1134/s2634827622010044

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Citations (7)

Matched Spin Probes for the Study of the Overall Motion of Model Lubricants

Magnetic Resonance in Chemistry (1997)

Melanie M. Britton Susan A. Fawthrop Duncan G. Gillies L. H. Sutcliffe Xin Wu

For ESR studies of molecular rotation in liquids, it is desirable to match the spin probe as closely as possible to the solvent molecules. In this work the solvents were model lubricants whose overall motion has been characterized from carbon-13 NMR relaxation measurements. Two compounds were studied, the approximately cylindrical mol-ecule 5-(n-octyl)naphthalene (ON) (a model low-traction fluid) and the approximately spherical molecule dicyclohexy-3,4-furan dicarboxylate (DCFDC) (a model high-traction fluid). For these two compounds the matched spin probes 5-(n-octyl)-1,1,13,3-tetrakis(trideuteriomethyl)isoindolin-2-yloxyl (OTMIOD) and 4,5-bis(cyclohexyloxycarbonyl)-1,3,2-dithiazol-2-yl (BCCD), respectively, were prepared. ESR measurements were made on OTMIOD in ON and in toluene at two frequencies, namely 9 GHz (X band) and 94 GHz (W band), and the importance of making the high-frequency measurements was demonstrated for evaluation of the anisotropy parameters. The results are different for the two solvents, thus proving the necessity for matching the spin probe to the solvent. BCCD was shown to be tumbling isotropically in DCFDC. Activation energies were derived for the overall motions from the ESR and NMR measurements. These activation energies were compared with those for the viscosities of the solvents. The viscosities of both ON and DCFDC were measured over a wide temperature range using an ESR method. © 1997 John Wiley & Sons, Ltd.

Spin probe

Microviscosity

10.1002/(sici)1097-458x(199708)35:8<493::aid-omr121>3.0.co;2-i

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Magnetic resonance imaging in a hands-on student experiment using an EPR spectrometer

Concepts in Magnetic Resonance (1999)

Alex I. Smirnov R. Linn Belford Reef Morse

Many modern medical diagnostic techniques, including magnetic resonance imaging (MRI) and computed tomography, are based on image reconstruction from projections. Unfortunately, the high cost of acquiring, maintaining, and operating MRI equipment makes it unavailable for hands-on undergraduate student laboratory experiments. Here, we describe a laboratory module for teaching the principles of MRI. It is based on a minor modification of an ordinary continuous wave electron paramagnetic resonance spectrometer. By applying magnetic field gradients, students learn the basic principles of MRI and practice with samples made from stable free radicals and a roasted coffee bean. The value of this laboratory experiment is to connect magnetic resonance spectroscopy with its application in imaging and to provide students with hands-on experience in the basics of computer-assisted tomography. ©1999 John Wiley & Sons, Inc. Concepts Magn Reson 11: 277–290, 1999

10.1002/(sici)1099-0534(1999)11:5<277::aid-cmr1>3.0.co;2-6

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Water concentration and dielectric constant gradients along the transmembrane peptide-lipid interface revealed by spin-labeling EPR methods

Biophysical Journal (2024)

Tatyana I. Smirnova Maxim A. Voinov Melanie Chestnut Sergey Milikisiyants Alex I. Smirnov

Site-directed spin labeling

Spin probe

10.1016/j.bpj.2023.11.364

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Influence of Low-Frequency Electromagnetic Field on Biometric Parameters of Scots Pine (Pinus sylvestris L.) Seedlings

Lesnoy Zhurnal (Forestry Journal) (2019)

Alex I. Smirnov F.S. Orlov V. V. Belyaev Petr Aksenov

Scots pine

Scots

10.17238/issn0536-1036.2019.2.78

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Competition between dynamic and structural disorder in a doped triangular antiferromagnet RbFe(MoO4)2

Journal of Physics Conference Series (2018)

Alex I. Smirnov T. A. Soldatov O. A. Petrenko Atsushi Takata Takanori Kida

Magnetisation measurements and electron spin resonance (ESR) spectra of a doped quasi two dimensional (2D) antiferromagnet on a triangular lattice Rb1−xKxFe(MoO4)2 reveal a crucial change of the ground state spin configuration and a disappearance of a characteristic 1/3-magnetisation plateau at x = 0.15. According to theory for triangular antiferromagnets with a weak random modulation of the exchange bonds, this is a result of the competition between the structural and dynamic disorders. The dynamic zero-point or thermal fluctuations are known to lift the degeneracy of the mean field ground state of a triangular antiferromagnet and cause the spin configuration to be the most collinear, while the static disorder provides another selection of the ground state, with the least collinear structure. Low-level doping (x ≤ 0.15) was found to decrease the Néel temperature and saturation field by only few percent, while the magnetisation plateau disappears completely and the spin configuration is drastically changed. ESR spectra confirm an impurity-induced change of the so-called Y-type structure to an inverted Y-structure for x = 0.15. For x = 0.075 the intermediate regime with the decrease of width and weakening of flattening of 1/3-plateau was found.

Hexagonal Lattice

10.1088/1742-6596/969/1/012115

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Quantification of Coal-Diesel Particulate Mixtures by W-Band (94-GHz) Electron Spin Resonance Spectroscopy

Applied Spectroscopy (1997)

Naresh S. Dalal Alex I. Smirnov R. Linn Belford

10.1366/0003702971942178

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Citations (2)

Electron irradiation-induced paramagnetic and fluorescent defects in type Ib high pressure–high temperature microcrystalline diamonds and their evolution upon annealing

Journal of Applied Physics (2022)

Nicholas Nunn Sergey Milikisiyants Evgeny O. Danilov Marco D. Torelli Laura Dei

Defects introduced to synthetic type Ib diamond micrometer-size particles by electron-beam irradiation were studied by electron paramagnetic resonance and photoluminescence (PL) spectroscopy as a function of e-beam fluence and post-irradiation thermal annealing. Increasing electron-beam fluence causes a substantial reduction of the substitutional nitrogen (P1) content, accompanied by progressively higher concentrations of paramagnetic negatively charged vacancies (V−) and triplet interstitials (R1/R2). Annealing results in a drastic decrease in the V− and R1/R2 content and an increase in the negatively charged nitrogen-vacancies (NV− or W15). Analysis of PL spectra allows for identification of color centers in the irradiated diamond samples and following their evolution after annealing. These data facilitate understanding of different factors contributing to the formation of color centers in diamond and promote efforts toward controlled engineering of optical centers in fluorescent diamond particles.

Microcrystalline

Electron beam processing

10.1063/5.0103313

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Citations (4)

CCDC 294911: Experimental Crystal Structure Determination

The Cambridge Structural Database (2006)

Maxim A. Voinov Yuliya F. Polienko Thomas Schanding Andrey A. Bobko Valery V. Khramtsov

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/cc9ww89

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