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Study of the dielectric permeability in the superhigh frequency range of a degraded polyoxybutyrate biopolymer / G. A. Beliaev [и др.] // Biofizika. - 2000. - Vol. 45, Is. 4. - С. 636-640 . - ISSN 0006-3029
Кл.слова (ненормированные):
biopolymer -- hydroxybutyric acid -- Alcaligenes -- article -- chemistry -- electric conductivity -- radiofrequency radiation -- Alcaligenes -- Biopolymers -- Electric Conductivity -- Hydroxybutyrates -- Radio Waves
Аннотация: The dielectric permeability of the degradable biopolymer polyhydroxybutyrate synthesized by hydrogen-oxidizing bacteria Alcaligenes eutrophus was investigated by the resonance method using original highly sensitive microstrip sensors. For the first time, a linear growth of dielectric permeability (delta epsilon/delta T = 7 x 10(-4) degree-1) due to the flexibility of the polymer chain in the temperature range from 10 to 70 degrees C was revealed. The energy of a bend of the nearest fragments was evaluated (E = 392 K), and its correspondence to the energies of bends of the alcyl groups of low-molecular substances like liquid crystals was established. It was shown that at low values of dielectric permeability in the high-frequency range (epsilon' = 2.25 +/- 0.02), which are stable, in a wide range of frequencies of the electromagnetic field (1 MHz - 1 Hz), polyoxybutyrate can be used in the microwave equipment.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Russia. : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Beliaev, G.A.; Volova, T.G.; Drokin, N.A.; Shepov, V.N.

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Surface bonding states of nano-crystalline diamond balls / J. L. Peng [et al.] // International Journal of Modern Physics B. - 2001. - Vol. 15, Is. 31. - P4071-4085, DOI 10.1142/S0217979201007865 . - ISSN 0217-9792
Кл.слова (ненормированные):
diamond -- article -- crystal structure -- electron -- energy transfer -- nanoparticle -- particulate matter -- structure analysis -- surface property -- transmission electron microscopy
Аннотация: The rough surface of nano-crystalline diamond spheres induces surface electronic states which appear as a broadened pre-peak over approx. 15 eV at the C K-edge energy threshold for carbon in the parallel electron energy loss spectrum (PEELS). This appears to be at least partially due to 1s-?* transitions, although typically the latter occupy a range of only 4 eV for the sp2 edge of highly-oriented pyrollytic graphite (HOPG). No ?* electrons appear in the conduction band inside the diamond particles, where all electrons are sp3 hybridized. PEELS data were also obtained from a chemical vapour deposited diamond film (CVDF) and gem-quality diamond for comparison with the spectra of nano-diamonds. The density of Sp2 and Sp3 states on the surface of diamond nano-crystals is calculated for simple structural models of the diamond balls, including some conjecture about surface structures. The results are used to interpret the sp2/sp3 ratios measured from the PEELS spectra recorded as scans across the particles. Surface roughness at the atomic scale was also examined using high-resolution transmission electron microscopy (HRTEM) and electron nano-diffraction patterns were used to confirm the crystal structures.

Scopus
Держатели документа:
Department of Applied Physics, RMIT University, Swanston Street, Melbourne, Vic. 3051, Australia
Electron Microscope Unit, University of Sydney, NSW 2006, Australia
Molecular Architecture Group, Kirensky Institute of Physics, Institute of Biophysics, 660036 Krasnoyarsk, Russian Federation
School of Physics, University of Melbourne, Parkville, Vic. 3010, Australia : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Peng, J.L.; Bulcock, S.; Belobrov, P.I.; Bursill, L.A.

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Investigation the dielectric permeability of the degradable biopolymer polyhydroxybutyrate in the super-high frequency range [Текст] / B. A. Belyaev [и др.] // Biofizika. - 2000. - Vol. 45, Is. 4. - С. 636-640. - Cited References: 11 . - 5. - ISSN 0006-3029

РУБ Biophysics

Кл.слова (ненормированные):
polyhydroxybutyrate -- dielectric permeability
Аннотация: The dielectric permeability of the degradable biopolymer polyhydroxybutyrate synthesized by hydrogen-oxidizing bacteria Alcaligenes eutrophus was investigated by the resonance method using original highly sensitive microstrip sensors. For the first time, a linear growth of dielectric permeability (delta epsilon/deltaT = 7.10(-4) degree(-1)) due to the flexibility of the polymer chain in the temperature range from 10 to 70 degreesC was revealed. The energy of a bend of the nearest fragments was evaluated (E = 392 K), and its correspondence to the energies of bends of the alcyl groups of low-molecular substances like liquid crystals was established. It was shown that at low values of dielectric permeability in the high-frequency range (epsilon' = 2.25 +/- 0.02),which are stable, in a wide range of frequencies of the electromagnetic field (1 MHz - 1 Hz), polyoxybutyrate call be used ill the microwave equipment.

Держатели документа:
Russian Acad Sci, Inst Biophys, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk, Russia : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Belyaev, B.A.; Volova, T.G.; Drokin, N.A.; Shepov, V.N.

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Electrooptic parameters of molecular crystals: Technique of calculations / A. N. Botvich [et al.] // CONFERENCE ON LASERS AND ELECTRO-0PTICS. - 1989. - Summaries of Papers Presented at the Conference on Lasers and Electro-Optics (24 April 1989 through 28 April 1989, Baltimore, MD, USA) Conference code: 12771. - P210
Кл.слова (ненормированные):
Benzene -- Computer Simulation -- Electrooptical Effects -- Digest of Paper -- Intermolecular Distances -- Molecular Polarizability -- Molecular Crystals
Аннотация: Computer simulations of electrooptic interactions in solid molecular systems have been widely used with good effect. In these calculations molecules are usually considered point dipoles (molecule-point approximation), their parameters are taken from free molecules, and summations over the crystal lattice (lattice sums) are done by the Ewald method. Synthesis of effective new systems for electrooptic applications results in large complicated molecules much longer than the intermolecular distances in crystals. To take molecular fragmentation directly into account in this approach requires very long computing time. To simplify this problem, the molecular lattice sums are modified by dividing the molecule into fragments and calculating the lattice sums for each fragment. The results are then averaged over the weight fragment polarizabilities. This weighting coefficient is introduced to take account of the anisotropy of the molecular polarizability distribution over the molecular frame. The rest of the calculations are performed in the usual way. The method has been used to calculate linear and nonlinear optic parameters for some substituted benzene crystals with good results.

Scopus
Держатели документа:
L.V. Kirensky Inst of Phys, Krasnoyarsk, USSR : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Botvich, A.N.; Podoprigora, V.G.; Shabanov, V.F.; Vtyurin, A.N.

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SURFACE PHONONS IN MOLECULAR CRYSTALS. / V. G. Podoprigora [et al.] // Physica Status Solidi (B) Basic Research. - 1987. - Vol. 139, Is. 1. - P109-115 . - ISSN 0370-1972
Кл.слова (ненормированные):
HYDROCARBONS - Surfaces -- PHONONS -- MOLECULAR CRYSTALS -- SURFACE PHONONS -- CRYSTALS
Аннотация: The lattice dynamics of the surface layers of anthracene and beta -paradichlorobenzene crystals as well as of the adsorbed monolayer of paradibromobenzene on beta -paradichlorobenzene is investigated using the method of atom-atom potentials in slab dynamical calculations. The dynamic, structural, and electro-optical parameters of the surface crystal layers are compared with those for the bulk.

Scopus
Держатели документа:
Acad of Sciences of the USSR, Krasnoyarsk, USSR, Acad of Sciences of the USSR, Krasnoyarsk, USSR : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Podoprigora, V.G.; Remizov, I.A.; Shabanov, V.F.; Botvich, A.N.

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PHOTON-PHONON INTERACTION INFLUENCE ON THE EXTERNAL VIBRATION SPECTRA OF MOLECULAR CRYSTALS. / A. N. Botvich [et al.] // Physica Status Solidi (B) Basic Research. - 1986. - Vol. 134, Is. 2. - P515-522 . - ISSN 0370-1972
Кл.слова (ненормированные):
BENZENE -- PHONONS -- PHOTONS -- EXTERNAL VIBRATION SPECTRA -- M-CHLORONITROBENZENE -- MOLECULAR CRYSTALS -- PHOTON-PHONON INTERACTION -- CRYSTALS
Аннотация: A method is developed to determine the parameters of electromagnetic and elastic excitations in molecular crystals including the polariton resonance region. The dependence of eigenvectors and eigenfrequencies on the wavevector of elementary excitations is calculated numerically for m-chloronitrobenzene crystals. The conditions are found when the photon-phonon resonance effect becomes observable in the Raman scattering (RS) spectra of this crystal.

Scopus
Держатели документа:
Acad of Sciences of the USSR, Krasnoyarsk, USSR, Acad of Sciences of the USSR, Krasnoyarsk, USSR : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Botvich, A.N.; Shabanov, V.F.; Vtyurin, A.N.; Pozdnyakova, T.A.

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Effect of non-central interactions on energy and lattice dynamics of molecular crystals / I. A. Remizov [et al.] // Chemical Physics. - 1985. - Vol. 92, Is. 1. - P163-168 . - ISSN 0301-0104
Аннотация: Atom-atom, multipole-multipole and three-body potentials have been used to calculate the energy and lattice dynamics of ?-paradichlorobenzene, phenanthrene and m-chloronitrobenzene. Non-central interactions are shown to give a significant contribution to the intermolecular interaction energy but have little effect on the phonon spectrum of the crystals. В© 1985.

Scopus
Держатели документа:
L.V. Kirensky Institute of Physics, USSR Academy of Sciences, Siberian Branch, 660036 Krasnoyarsk, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Remizov, I.A.; Podoprigora, V.G.; Botvich, A.N.; Kharitonova, T.A.; Shabanov, V.F.

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Preparation and X-ray crystallographic analysis of the Ca2+-discharged photoprotein obelin [Text] / L. . Deng [et al.] // Acta Crystallogr. Sect. D-Biol. Crystallogr. - 2004. - Vol. 60. - P512-514, DOI 10.1107/S090744490302852X. - Cited References: 18 . - ISSN 0907-4449

РУБ Biochemical Research Methods + Biochemistry & Molecular Biology + Biophysics + Crystallography
Рубрики:
VIOLET BIOLUMINESCENCE
   ANGSTROM RESOLUTION
   W92F OBELIN
   AEQUORIN
   SEQUENCE
   PROTEIN
   CLONING
   CDNA
Аннотация: Ca2+-regulated photoproteins belong to the EF-hand Ca2+-binding protein family. The addition of calcium ions initiates bright blue bioluminescence of the photoproteins, a result of the oxidative breakdown of coelenterazine peroxide to coelenteramide. Crystals of the Ca2+-discharged W92F mutant of obelin from Obelia longissima have been grown, representing the first crystallization of a photoprotein after the Ca2+-triggered bioluminescence. A green fluorescence observed from the crystals clearly demonstrates that coelenteramide, the bioluminescence product of coelenterazine peroxide, is bound within the protein. The diffraction pattern exhibits tetragonal Laue symmetry. Systematic absences indicate that the space group is either P4(3)2(1)2 or P4(1)2(1)2. The unit-cell parameters are a=b=53.4, c=144.0 Angstrom. The crystals diffract to 1.9 Angstrom resolution.

Держатели документа:
Univ Georgia, Dept Biochem & Mol Biol, Athens, GA 30602 USA
Univ Georgia, Dept Chem, Athens, GA 30602 USA
Russian Acad Sci, Inst Biophys, Siberian Branch, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Deng, L...; Markova, S.V.; Vysotski, E.S.; Liu, Z.J.; Lee, J...; Rose, J...; Wang, B.C.

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Atomic resolution structure of obelin: soaking with calcium enhances electron density of the second oxygen atom substituted at the C2-position of coelenterazine [Text] / Z. J. Liu [et al.] // Biochem. Biophys. Res. Commun. - 2003. - Vol. 311, Is. 2. - P433-439, DOI 10.1016/j.bbrc.2003.09.231. - Cited References: 29 . - ISSN 0006-291X

РУБ Biochemistry & Molecular Biology + Biophysics
Рубрики:
CRYSTAL-STRUCTURE
   BIOLUMINESCENT PROTEIN
   VIOLET BIOLUMINESCENCE
   PHOTOPROTEIN AEQUORIN
   ANGSTROM RESOLUTION
   RECOMBINANT OBELIN
   W92F OBELIN
   PURIFICATION
   REFINEMENT
   EXPRESSION
Кл.слова (ненормированные):
photoprotein -- bioluminescence -- atomic resolution -- EF-hand
Аннотация: The spatial structure of the Ca2+-regulated photoprotein obelin has been solved to resolution of 1.1 Angstrom. Two oxygen atoms are revealed substituted at the C2-position of the coelenterazine in contrast to the obelin structure at 1.73 Angstrom resolution where one oxygen atom only was disclosed. The electron density of the second oxygen atom was very weak but after exposing the crystals to a trace of Ca2+, the electron densities of both oxygen atoms became equally intense. In addition, one Ca2+ was found bound in the loop of the first EF-hand motif. Four of the ligands were provided by protein residues Asp30, Asn32, Asn34, and the main chain oxygen of Lys36. The other two were from water molecules. From a comparison of B-factors for the residues constituting the active site, it is suggested that the variable electron densities observed in various photoprotein structures could be attributed to different mobilities of the peroxy oxygen atoms. (C) 2003 Elsevier Inc. All rights reserved.

Держатели документа:
Univ Georgia, Dept Biochem & Mol Biol, Athens, GA 30602 USA
Univ Georgia, Dept Chem, Athens, GA 30602 USA
Russian Acad Sci, Inst Biophys, Siberian Branch, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Liu, Z.J.; Vysotski, E.S.; Deng, L...; Lee, J...; Rose, J...; Wang, B.C.

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10.

Preparation and X-ray crystallographic analysis of recombinant obelin crystals diffracting to beyond 1.1 angstrom [Text] / E. S. Vysotski [et al.] // Acta Crystallogr. Sect. D-Biol. Crystallogr. - 2001. - Vol. 57. - P1919-1921, DOI 10.1107/S0907444901016523. - Cited References: 16 . - ISSN 0907-4449

РУБ Biochemical Research Methods + Biochemistry & Molecular Biology + Biophysics + Crystallography
Рубрики:
PHOTOPROTEIN AEQUORIN
   LONGISSIMA
   EVOLUTION
   CDNA
Аннотация: Crystals of recombinant obelin, the Ca2+-regulated photoprotein from the marine hydroid Obelia longissima, have been grown from a solution containing PEG 8000 and potassium phosphate. Hexamine-cobalt trichloride was used as an additive to increase the chance of crystallization. The crystals grow in a light yellow cubic form (0.5 x 0.5 x 0.45 mm) which diffracts to beyond 1.1 Angstrom resolution. The crystals belong to the space group C2, with unit-cell parameters a=83.43, b=54.92, c=52.99 Angstrom, beta = 112.00 degrees. The asymmetric unit contains one molecule. Crystals exposed to calcium ion before and after X-ray irradiation emit light, confirming that the crystals consist of an active photoprotein.

Держатели документа:
Univ Georgia, Dept Biochem & Mol Biol, Athens, GA 30602 USA
Russian Acad Sci, Siberian Branch, Inst Biophys, Photobiol Lab, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Vysotski, E.S.; Liu, Z.J.; Rose, J...; Wang, R.C.; Lee, J...

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11.

Structure of the Ca2+-regulated photoprotein obelin at 1.7 angstrom resolution determined directly from its sulfur substructure [Text] / Z. J. Liu [et al.] // Protein Sci. - 2000. - Vol. 9, Is. 11. - P2085-2093. - Cited References: 41 . - ISSN 0961-8368

РУБ Biochemistry & Molecular Biology
Рубрики:
CALCIUM-MODULATED PROTEINS
   AMINO-ACID SEQUENCE
   CA-2+-BINDING PHOTOPROTEIN
   CA2+-BINDING PHOTOPROTEIN
   MACROMOLECULAR STRUCTURES
   3-DIMENSIONAL STRUCTURE
   ANOMALOUS SCATTERING
   CRYSTAL-STRUCTURES
   DIFFRACTION DATA
   BINDING SITE
Кл.слова (ненормированные):
bioluminescence -- crystallography -- obelin -- photoprotein -- single wavelength anomalous scattering -- solvent flattening -- sulfur phasing
Аннотация: The crystal structure of the photoprotein obelin (22.2 kDa) from Obelia longissima has been determined and refined to 1.7 Angstrom resolution. Contrary to the prediction of a peroxide, the noncovalently bound substrate, coelenterazine, has only a single oxygen atom bound at the C2-position. The protein-coelenterazine 2-oxy complex observed in the crystals is photo-active because, in the presence of calcium ion, bioluminescence emission within the crystal is observed. This structure represents only the second de novo protein structure determined using the anomalous scattering signal of the sulfur substructure in the crystal. The method used here is theoretically different from that used for crambin in 1981 (4.72 kDa) and represents a significant advancement in protein crystal structure determination.

Держатели документа:
Univ Georgia, Dept Biochem & Mol Biol, Athens, GA 30602 USA
Russian Acad Sci, Inst Biophys, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Liu, Z.J.; Vysotski, E.S.; Chen, C.J.; Rose, J.P.; Lee, J...; Wang, B.C.

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12.

Preparation and preliminary study of crystals of the recombinant calcium-regulated photoprotein obelin from the bioluminescent hydroid Obelia longissima [Text] / E. S. Vysotski [et al.] // Acta Crystallogr. Sect. D-Biol. Crystallogr. - 1999. - Vol. 55. - P1965-1966, DOI 10.1107/S0907444999011828. - Cited References: 23 . - ISSN 0907-4449

РУБ Biochemical Research Methods + Biochemistry & Molecular Biology + Biophysics + Crystallography
Рубрики:
AEQUORIN
LUCIFERASE
LIGHT
Аннотация: Crystals of recombinant obelin, the Ca2+-regulated photoprotein from the marine hydroid Obelia longissima, have been grown from sodium citrate solutions. Crystals grow as hexagonal light-yellow rods (0.1 x 0.1 x 1.0 mm) which diffract to beyond 1.8 Angstrom with synchrotron radiation of 1.0 Angstrom wavelength. The crystals have a primitive hexagonal lattice with unit-cell parameters a = 81.55, c = 86.95 Angstrom. The asymmetric unit contains two molecules. This represents the successful preparation of single crystals of a photoprotein obelin which have promising diffraction properties.

Держатели документа:
Russian Acad Sci, Photobiol Lab, Inst Biophys, Siberian Branch, Krasnoyarsk 660036, Russia
Univ Georgia, Dept Biochem & Mol Biol, Athens, GA 30602 USA
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Vysotski, E.S.; Liu, Z.J.; Rose, J...; Wang, B.C.; Lee, J...

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13.

High-resolution structures of scytalone dehydratase-inhibitor complexes crystallized at physiological pH [Text] / Z. . Wawrzak [et al.] // Proteins. - 1999. - Vol. 35, Is. 4. - P. 425-439, DOI 10.1002/(SICI)1097-0134(19990601)35:4425::AID-PROT63.0.CO;2-1. - Cited References: 33 . - ISSN 0887-3585

РУБ Biochemistry & Molecular Biology + Biophysics
Рубрики:
MAGNAPORTHE-GRISEA
   HEMAGGLUTININ
   GLYCOPROTEIN
   REFINEMENT
   MELANIN
   DISEASE
   SITE
Кл.слова (ненормированные):
structure-based design -- enzyme inhibitors -- X-ray crystallography -- fungicides -- melanin biosynthesis
Аннотация: Scytalone dehydratase is a molecular target of inhibitor design efforts aimed at preventing the fungal disease caused by Magnaporthe grisea. A method for cocrystallization of enzyme with inhibitors at neutral pH has produced several crystal structures of enzyme-inhibitor complexes at resolutions ranging from 1.5 to 2.2 Angstrom Four high resolution structures of different enzyme-inhibitor complexes are described. In contrast to the original X-ray structure of the enzyme, the four new structures have well-defined electron density for the loop region comprising residues 115-119 and a different conformation between residues 154 and 160. The structure of the enzyme complex with an aminoquinazoline inhibitor showed that the inhibitor is in a position to form a hydrogen bond with the amide of the Asn131 side chain and with two water molecules in a fashion similar to the salicylamide inhibitor in the original structure, thus confirming design principles. The aminoquinazoline structure also allows for a more confident assignment of donors and accepters in the hydrogen bonding network, The structures of the enzyme complexes with two dichlorocyclopropane carboxamide inhibitors showed the two chlorine atoms nearly in plane with the amide side chain of Asn131. The positions of Phe53 and Phe158 are significantly altered in the new structures in comparison to the two structures obtained from crystals grown at acidic pH, The multiple structures help define the mobility of active site amino acids critical for catalysis and inhibitor binding. Proteins 1999;35:425-439. (C) 1999 Wiley-Liss, Inc.

WOS
Держатели документа:
Dupont Co, Stine Haskell Res Ctr, Agr Prod, Newark, DE 19714 USA
Dupont Co, Expt Stn, Life Sci, Wilmington, DE USA
Karolinska Inst, Dept Med Biochem & Biophys, Stockholm, Sweden
Russian Acad Sci, Inst Biophys, Krasnoyarsk, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Wawrzak, Z...; Sandalova, T...; Steffens, J.J.; Basarab, G.S.; Lundqvist, T...; Lindqvist, Y...; Jordan, D.B.

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14.

Physicochemical properties of Al2O3 powder produced by explosive synthesis [Text] / A. A. Bukaemskii, A. G. Beloshapko, A. P. Puzyr // Combust. Explos. - 2000. - Vol. 36, Is. 5. - P. 660-666, DOI 10.1007/BF02699530. - Cited References: 18 . - ISSN 0010-5082

РУБ Thermodynamics + Energy & Fuels + Engineering, Multidisciplinary + Engineering, Chemical + Materials Science, Multidisciplinary

Аннотация: The phase, dispersive, and morphological features of an aluminum oxide powder produced by explosive synthesis are examined experimentally. It is shown that the particle-size distribution has three distinct maxima, which are due to different combustion regimes. The relationship between the sizes and morphology of the starting powder and the product is determined. Considerable attention is given to a study of the ultrafine fraction of the product powder. The ultrafine particles are shown to have a regular spherical shape, and sinters are not revealed. Besides spherical particles, the synthesized powder contains faceted crystals. X-ray phase analysis of the ultrafine fraction of the synthesized powders shows that this fraction consists only of the metastable phases of the oxide - the delta- or oxynitride modifications. The delta -modification differs from that described in the literature.

WOS
Держатели документа:
Krasnoyarsk State Univ, Inst Physicotech, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Biophys, Siberian Div, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Bukaemskii, A.A.; Beloshapko, A.G.; Puzyr, A.P.

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15.

Surface bonding states of nano-crystalline diamond balls [Text] / J. L. Peng [et al.] // Int. J. Mod. Phys. B. - 2001. - Vol. 15, Is. 31. - P. 4071-4085, DOI 10.1142/S0217979201007865. - Cited References: 20 . - ISSN 0217-9792

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
PLASMON RESPONSE
   POWDER
   SPECTROSCOPY
   MICROSCOPY
   SILICON
   SI(111)
Аннотация: The rough surface of nano-crystalline diamond spheres induces surface electronic states which appear as a broadened pre-peak over approx. 15 eV at the C K-edge energy threshold for carbon in the parallel electron energy loss spectrum (PEELS). This appears to be at least partially due to 1s-pi* transitions, although typically the latter occupy a range of only 4 eV for the sp(2) edge of highly-oriented pyrollytic graphite (HOPG). No pi* electrons appear in the conduction band inside the diamond particles, where all electrons are sp(3) hybridized. PEELS data were also obtained from a chemical vapour deposited diamond film (CVDF) and gem-quality diamond for comparison with the spectra of nano-diamonds. The density of sp(2) and sp(3) states on the surface of diamond nano-crystals is calculated for simple structural models of the diamond balls, including some conjecture about surface structures. The results are used to interpret the sp(2)/sp(3) ratios measured from the PEELS spectra recorded as scans across the particles. Surface roughness at the atomic scale was also examined using high-resolution transmission electron microscopy (HRTEM) and electron nano-diffraction patterns were used to confirm the crystal structures.

WOS
Держатели документа:
RMIT Univ, Dept Appl Phys, Melbourne, Vic 3051, Australia
Univ Sydney, Electron Microscope Unit, Sydney, NSW 2006, Australia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Mol Architecture Grp, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, Inst Biophys, Krasnoyarsk 660036, Russia
Univ Melbourne, Sch Phys, Parkville, Vic 3052, Australia
ИФ СО РАН
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Peng, J.L.; Bulcock, S...; Belobrov, P.I.; Bursill, L.A.

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16.

Analysis of interactions between proteins and small-molecule drugs by a biosensor based on a graphene field-effect transistor / S. Xu, T. Wang, G. Liu [et al.] // Sens Actuators, B Chem. - 2021. - Vol. 326. - Ст. 128991, DOI 10.1016/j.snb.2020.128991 . - ISSN 0925-4005
Кл.слова (ненормированные):
Binding kinetics -- FET -- Imatinib -- LMW drugs -- Single-crystal graphene -- Biosensors -- Biosynthesis -- Drug interactions -- Graphene -- Graphene transistors -- Proteins -- Single crystals -- Graphene field-effect transistors -- Graphene sheets -- Interaction kinetics -- Linear response -- Low molecular weight drugs -- Real time -- Small-molecule drugs -- Target proteins -- Field effect transistors
Аннотация: We synthesized large-area single-crystal graphene sheets to use them in biosensors based on field-effect transistors (FET) for quantitative analysis of interaction kinetics and affinity between the imatinib drug and its target protein kinase Abl1. The G-FET biosensor showed an excellent performance and recognized imatinib at as low as 15.5 fM. The biosensor also showed a linear response to the logarithm of imatinib concentration in the 0.1 pM-10 ?M range. This graphene-based FET biosensor (G-FET) was also applied to quantify Abl1 Y253 F mutation and Abl1 dependency on Mg2+ to bind to imatinib in real-time. Results demonstrated in this work clearly showed that the novel G-FET biosensors are very promising to analyze interactions between proteins and low molecular weight drugs. © 2020 Elsevier B.V.

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Держатели документа:
Shandong Key Laboratory of Biophysics, Institute of Biophysics, Dezhou University, Dezhou, 253023, China
Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, Krasnoyarsk, 660036, Russian Federation
Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan, 250358, China

Доп.точки доступа:
Xu, S.; Wang, T.; Liu, G.; Cao, Z.; Frank, L. A.; Jiang, S.; Zhang, C.; Li, Z.; Krasitskaya, V. V.; Li, Q.; Sha, Y.; Zhang, X.; Liu, H.; Wang, J.

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