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1

Golovko, V. V., S. N. Stepanyuk, and D. Yu Ermolenko. "Dispersion modification of dendrite structure of weld metal." Paton Welding Journal 2019, no. 6 (2019): 13–18. http://dx.doi.org/10.15407/tpwj2019.06.02.

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2

Rehpenn, Andreas, Alexandra Walter, and Golo Storch. "Molecular Editing of Flavins for Catalysis." Synthesis 53, no. 15 (2021): 2583–93. http://dx.doi.org/10.1055/a-1458-2419.

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AbstractThe diverse activity of flavoenzymes in organic transformations has fascinated researchers for a long time. However, when applied outside an enzyme environment, the isolated flavin cofactor only shows largely reduced activity. This highlights the importance of embedding the reactive isoalloxazine core of flavins in defined surroundings. The latter include crucial non-covalent interactions with amino acid side chains or backbone as well as controlled access to reactants such as molecular oxygen. Nevertheless, molecular flavins are increasingly applied in the organic laboratory as valuab
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3

Kura, T., and E. Fornalik-Wajs. "Near-blade flow structure modification." Journal of Physics: Conference Series 760 (October 2016): 012013. http://dx.doi.org/10.1088/1742-6596/760/1/012013.

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4

Mitchell, J. R. "Cellulose, structure, modification and hydrolysis." Carbohydrate Polymers 7, no. 2 (1987): 162. http://dx.doi.org/10.1016/0144-8617(87)90059-2.

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5

Howard, P. "Cellulose structure, modification and hydrolysis." Polymer 28, no. 10 (1987): 1796. http://dx.doi.org/10.1016/0032-3861(87)90027-9.

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6

Marchessault, Robert H. "Cellulose: Structure, Modification and Hydrolysis." Carbohydrate Research 165, no. 1 (1987): c7—c8. http://dx.doi.org/10.1016/0008-6215(87)80094-0.

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7

Lysiuk, V. O. "Modification of optical properties and structure of thin films for enhancing absorption." Semiconductor Physics Quantum Electronics and Optoelectronics 17, no. 2 (2014): 209–12. http://dx.doi.org/10.15407/spqeo17.02.209.

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8

Tafeenko, V. A., V. V. Chernyshev, A. V. Yatsenko, et al. "Intermolecular —CH3...O2N— contacts in two polymorphic modifications of (1E)-N'-[(E)-2-cyano-1-(dimethylamino)-2-nitrovinyl]-N,N-dimethylethanimidamide." Acta Crystallographica Section B Structural Science 59, no. 4 (2003): 492–97. http://dx.doi.org/10.1107/s0108768103010231.

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The title compound was synthesized and isolated in two crystal modifications. The structure of the orthorhombic modification was determined by the X-ray powder diffraction method and the structure of the monoclinic modification was determined using the X-ray single-crystal diffraction technique. The molecules in both polymorphs are E,E isomers. Intermolecular H3C...NO2 contacts and their role in the formation of the polymorphic modifications are analyzed.
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9

Ogawa, Tetsuya, Kiyoshi Kuwamoto, Seiji Isoda, Takashi Kobayashi, and Norbert Karl. "3,4:9,10-Perylenetetracarboxylic dianhydride (PTCDA) by electron crystallography." Acta Crystallographica Section B Structural Science 55, no. 1 (1999): 123–30. http://dx.doi.org/10.1107/s0108768198009872.

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The crystal structures of the α and β modifications of PTCDA were analyzed as projected structures along the a axes by electron crystallography using an imaging plate. The results for the α modification agree well with the sheet-and-stack structure obtained by X-ray diffraction by M. L. Kaplan et al. (private communication, full set of crystal structure data). Projected onto the (102) plane, which is parallel to the molecular sheets, the long molecular axis makes an angle of 42° with the b axis and the hexagonal benzene rings appear slightly elongated, indicating a slight inclination of the mo
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10

Liu, Niu Can, Jun Qing Li, and Zhong Xia Liu. "Effect of Compound Modification on Structure of Hypereutectic Al-Si Alloy." Advanced Materials Research 160-162 (November 2010): 189–93. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.189.

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Double compound modification was carried out for hypereutectic Al-24Si alloy. The experiment showed that double modification with phosphorus and rare earth can fine the structure of alloy. The complex modifications of phosphorus and rare earth make the coarse block primary silicon obviously refined and the large needle eutectic silicon modified to the fine fibrous or lamella ones. Phosphorus mainly refines the primary silicon. Rare earth can well refine the primary and eutectic silicon, but its modification effect on the eutectic silicon is more obvious. The alloys with the additions of 0.10%
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11

Riecken, Jan F., Gunter Heymann, Theresa Soltner, et al. "The High-Pressure Modification of CePtSn – Synthesis, Structure, and Magnetic Properties." Zeitschrift für Naturforschung B 60, no. 8 (2005): 821–30. http://dx.doi.org/10.1515/znb-2005-0802.

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The high-pressure (HP) modification of CePtSn was prepared under multianvil high-pressure (9.2 GPa) high-temperature (1325 K) conditions from the normal-pressure (NP) modification. Both modifications were investigated by powder and single crystal X-ray data: TiNiSi type, Pnma, a = 746.89(9), b = 462.88(4), c = 801.93(7) pm, wR2 = 0.0487, 452 F2 values, 20 variable parameters for NP-CePtSn, and ZrNiAl type, P6̅2m, a = 756.919(5), c = 415.166(4) pm, wR2 = 0.0546, 252 F2 values, 14 variable parameters for HP-CePtSn. Both modifications are built up from platinumcentered trigonal prisms. Together,
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12

Sengupta, Antara, Akansha Ganguly, and Shantanu Chowdhury. "Promise of G-Quadruplex Structure Binding Ligands as Epigenetic Modifiers with Anti-Cancer Effects." Molecules 24, no. 3 (2019): 582. http://dx.doi.org/10.3390/molecules24030582.

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Evidences from more than three decades of work support the function of non-duplex DNA structures called G-quadruplex (G4) in important processes like transcription and replication. In addition, G4 structures have been studied in connection with DNA base modifications and chromatin/nucleosome arrangements. Recent work, interestingly, shows promise of G4 structures, through interaction with G4 structure-interacting proteins, in epigenetics—in both DNA and histone modification. Epigenetic changes are found to be intricately associated with initiation as well as progression of cancer. Multiple onc
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13

Wada, Ryohei, and Wataru Yoshida. "Thermal Stability Changes in Telomeric G-Quadruplex Structures Due to N6-Methyladenine Modification." Epigenomes 5, no. 1 (2021): 5. http://dx.doi.org/10.3390/epigenomes5010005.

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N6-methyladenine modification (m6dA) has recently been identified in eukaryote genomic DNA. The methylation destabilizes the duplex structure when the adenine forms a Watson–Crick base pair, whereas the methylation on a terminal unpaired adenine stabilizes the duplex structure by increasing the stacking interaction. In this study, the effects of m6dA modification on the thermal stability of four distinct telomeric G-quadruplex (G4) structures were investigated. The m6dA-modified telomeric oligonucleotide d[AGGG(TTAGGG)3] that forms a basket-type G4 in Na+, d[(TTAGGG)4TT] that forms a hybrid-ty
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14

Puzan, Anna N., Vyacheslav N. Baumer, and Pavel V. Mateychenko. "Novel modification of anhydrous transition metal oxalates from powder diffraction." Acta Crystallographica Section C Structural Chemistry 73, no. 11 (2017): 911–16. http://dx.doi.org/10.1107/s2053229617012839.

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The known metal–C2O4 structures may be divided into two modifications, α and β. The α-modification has an order–disorder struxture, revealing one-dimensional disordering of the metal–oxalate chains, and the β-modification is ordered. The crystal structures of orthorhombic γ-MnC2O4 {poly[μ-oxalato-manganese(II)]; space group Pmna, a = 7.1333 (1), b = 5.8787 (1), c = 9.0186 (2) Å, V = 378.19 (1) Å3, Z = 4 and Dx = 2.511 Mg m−3} and γ-CdC2O4 {poly[μ-oxalato-cadmium(II)]; space group Pmna, a = 7.3218 (1), b = 6.0231 (1), c = 9.2546 (2) Å, V = 408.13 (1) Å3, Z = 4 and Dx = 3.262 Mg m−3} have been o
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15

Wang, Xiaoyuan, and Peter J. Quinn. "Lipopolysaccharide: Biosynthetic pathway and structure modification." Progress in Lipid Research 49, no. 2 (2010): 97–107. http://dx.doi.org/10.1016/j.plipres.2009.06.002.

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16

Zhao, Yun, Vilma Arce-Gorvel, Raquel Conde-Álvarez, Ignacio Moriyon, and Jean-Pierre Gorvel. "Vaccine development targeting lipopolysaccharide structure modification." Microbes and Infection 20, no. 9-10 (2018): 455–60. http://dx.doi.org/10.1016/j.micinf.2017.11.006.

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17

Levinskas, R., A. Baltušnikas, I. Lukošiūtė, K. Baltakys, R. Kalpokaitė-Dičkuvienė, and A. Grybėnas. "Modification of structure of synthetic gyrolite." Materials Research Innovations 17, no. 7 (2013): 495–500. http://dx.doi.org/10.1179/1433075x13y.0000000103.

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18

Sakiyama, Fumio. "Modification of enzyme structure and function." Kobunshi 35, no. 10 (1986): 950–53. http://dx.doi.org/10.1295/kobunshi.35.950.

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19

Lück, H. B., B. Gemende, and B. Heinrich. "Structure modification of particle track membranes." International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements 19, no. 1-4 (1991): 925–28. http://dx.doi.org/10.1016/1359-0189(91)90343-g.

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20

Popov, E. V., and E. V. Kononenko. "Calcium chloride modification of lyomesophase structure." Materials Chemistry and Physics 37, no. 1 (1994): 97–100. http://dx.doi.org/10.1016/0254-0584(94)90079-5.

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21

PEGO, MATHEUS, JANAÍNA CARVALHO, and DAVID GUEDES. "SURFACE MODIFICATIONS OF ACTIVATED CARBON AND ITS IMPACT ON APPLICATION." Surface Review and Letters 26, no. 01 (2019): 1830006. http://dx.doi.org/10.1142/s0218625x1830006x.

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The main and new surface modification methods of activated carbon (AC) and their influence on application (adsorption capacity) were reviewed. Adsorption capacity is an important issue, contributing to hazardous substances environment management. According to literature, it is true that surface chemistry strongly affects adsorption capacity. Surface chemistry can be modified by several methods that lead to different activated carbon properties. Furthermore, adsorbate properties, and their relationships with surface structure, can impact adsorption properties. Surface modifications can be condu
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22

Yang, Ren, Qi Song, and Pu Chen. "A direct topological reanalysis algorithm based on updating matrix triangular factorization." Engineering Computations 36, no. 8 (2019): 2651–72. http://dx.doi.org/10.1108/ec-09-2018-0432.

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Purpose The purpose of this paper is to establish and implement a direct topological reanalysis algorithm for general successive structural modifications, based on the updating matrix triangular factorization (UMTF) method for non-topological modification proposed by Song et al. [Computers and Structures, 143(2014):60-72]. Design/methodology/approach In this method, topological modifications are viewed as a union of symbolic and numerical change of structural matrices. The numerical part is dealt with UMTF by directly updating the matrix triangular factors. For symbolic change, an integral str
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23

Laketic, Sladjana, Marko Rakin, Aleksandra Cairovic, Vesna Maksimovic, and Ivana Cvijovic-Alagic. "Laser surface modification of metallic implant materials." Srpski arhiv za celokupno lekarstvo 147, no. 7-8 (2019): 497–501. http://dx.doi.org/10.2298/sarh181126054l.

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Metallic biomaterials are most commonly used as hard-tissue replacements because of their favorable mechanical features and excellent biocompatibility. The objective of this paper is to present an overview of diverse surface modification techniques, with a special emphasis on the laser surface modification method, as well as diverse characterization techniques used for investigating the impact of the surface modification process on metallic implant materials? properties. Moreover, the effect of laser radiation on the surface its and mechanical characteristics, as well as on the structure of me
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24

Linghong Jiang, Linghong Jiang, Jian Shen Linghong Jiang, Sai Ji Jian Shen, Yihui Dong Sai Ji, and Tiantian Miao Yihui Dong. "Hash Forest Structure Assisted Bi-auditing Protocol with Multiuser Modification in E-health Systems." 網際網路技術學刊 22, no. 4 (2021): 923–34. http://dx.doi.org/10.53106/160792642021072204019.

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25

Sulitsin, A. V., Raisa K. Mysik, and Sergey V. Brusnitsyn. "Modification of Copper." Solid State Phenomena 284 (October 2018): 357–62. http://dx.doi.org/10.4028/www.scientific.net/ssp.284.357.

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The requirement of modification of copper is proved in the article. As a modifier for copper the misch metal is proposed. The misch metal contains rare earth elements having greatest modifying ability. The results of experiments of the influence of misch metal in an amount from 0.0025 to 0.0125 wt. % on the formation of crystal structure of cast copper with different impurity content are presented. The metallographic analysis of macrostructure of copper is made and the average area of cross section of grains in the structure of copper is determined. The average area of cross section of grains
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26

Puja, Ign Wiratmaja, Khalid, and S. Weij. "Crash Zone Development for Railway Vehicle." Key Engineering Materials 306-308 (March 2006): 321–26. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.321.

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This paper considers crash zone development for railway vehicle to improve it’s crashworthiness characteristics. The principle of modification is by weakening the crash zone area and strengthening the passenger area. Thus the huge impact energy during collision will be absorbed by crash zone area so that it will maintain the structural integrity of the passengers. There are two type of modifications proposed in this study. The first modification is conducted by weakening the end-under-frame section and strengthening the middle-under-frame section. These modification shows deformation character
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27

Adams-Cioaba, Melanie A., and Jinrong Min. "Structure and function of histone methylation binding proteinsThis paper is one of a selection of papers published in this Special Issue, entitled CSBMCB’s 51st Annual Meeting – Epigenetics and Chromatin Dynamics, and has undergone the Journal’s usual peer review process." Biochemistry and Cell Biology 87, no. 1 (2009): 93–105. http://dx.doi.org/10.1139/o08-129.

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Chromatin structure is regulated by chromatin remodeling factors, histone exchange, linker histone association, and histone modification. Covalent modification of histones is an important factor in the regulation of the associated processes. The implementation and removal of various histone modifications have been implicated in DNA replication, repair, recombination, and transcription, and in RNA processing. In recent years, histone methylation has emerged as one of the key modifications regulating chromatin function. However, the mechanisms involved are complex and not well understood. A larg
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28

Hummel, Martin. "Baseline elaboration and echo-sounding at the adjective adverb interface." Cognitive Linguistics 29, no. 3 (2018): 407–52. http://dx.doi.org/10.1515/cog-2016-0033.

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AbstractThe paper examines the semantic effects of modification in phrases combining verbs with so-called short adverbs in French, that is, adjectives (A) used as modifiers of the verb (V), as inaller direct‘to go direct’ (VA structures). For this purpose, a sample of over 3200 attested examples has been analyzed. Far from being simple verb modifiers in the sense of “manner” modification, the qualitative analysis shows that short adverbs also refer to other features of the event, e.g. participant, instrument, source, goal, result, circumstance, and the speaker’s attitude. These manifold modifi
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Baquero-Perez, Belinda, Daryl Geers, and Juana Díez. "From A to m6A: The Emerging Viral Epitranscriptome." Viruses 13, no. 6 (2021): 1049. http://dx.doi.org/10.3390/v13061049.

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There are over 100 different chemical RNA modifications, collectively known as the epitranscriptome. N6-methyladenosine (m6A) is the most commonly found internal RNA modification in cellular mRNAs where it plays important roles in the regulation of the mRNA structure, stability, translation and nuclear export. This modification is also found in viral RNA genomes and in viral mRNAs derived from both RNA and DNA viruses. A growing body of evidence indicates that m6A modifications play important roles in regulating viral replication by interacting with the cellular m6A machinery. In this review,
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30

Calderon, Angie D., Lei Li, and Peng G. Wang. "FUT8: from biochemistry to synthesis of core-fucosylated N-glycans." Pure and Applied Chemistry 89, no. 7 (2017): 911–20. http://dx.doi.org/10.1515/pac-2016-0923.

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AbstractGlycosylation is a major posttranslational modification of proteins. Modification in structure on N-glycans leads to many diseases. One of such modifications is core α-1,6 fucosylation, which is only found in eukaryotes. For this reason, lots of research has been done on approaches to synthesize core-fucosylated N-glycans both chemically and enzymatically, in order to have well defined structures that can be used as probes for glycan analysis and identifying functions of glycan-binding proteins. This review will focus on FUT8, the enzyme responsible for core fucosylation in mammals and
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31

Adetola, Opeyemi, Leonid Golovko, and Aleksey Vasiliev. "Modification of Silica Gel by Heteropolyacids." Key Engineering Materials 689 (April 2016): 126–32. http://dx.doi.org/10.4028/www.scientific.net/kem.689.126.

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Silica gels containing incorporated heteropolyacids (HPAs) were synthesized in acidic media by co-condensation of tetraethoxysilane (TEOS) with phosphotungstic or phosphomolybdic acids using the sol-gel technique. The effect of the synthesis conditions on their structure and morphology was studied. Yields of modified materials were somewhat lower compared to non-modified silica gels. All materials were mesoporous but contained micropores in their structures. Presence of bands of Keggin’s structures in FT-IR spectra along with absence of XRD patterns of crystalline HPAs confirmed their fine inc
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32

Stappen, Iris, Joris Höfinghoff, Gerhard Buchbauer, and Peter Wolschann. "Structure-Activity Relationships of Sandalwood Odorants: Synthesis of a New Campholene Derivative." Natural Product Communications 5, no. 9 (2010): 1934578X1000500. http://dx.doi.org/10.1177/1934578x1000500902.

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Structural modifications of natural (-)-( Z)-β-santalol have shown that the sandalwood odor impression is highly sensitive, even to small structural changes. Particularly, the substitution of the quaternary carbon is of great influence on the scent. Epi-compounds with side chains in the endo-position possess sandalwood odor in only a few derivatives, whereas modifications at this side chain, as well as modification at the bicyclic ring systems mostly lead to a complete loss of sandalwood fragrance.
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33

Karfunkel, H. R., Z. J. Wu, A. Burkhard, et al. "Crystal packing calculations and Rietveld refinement in elucidating the crystal structures of two modifications of 4-amidinoindanone guanylhydrazone." Acta Crystallographica Section B Structural Science 52, no. 3 (1996): 555–61. http://dx.doi.org/10.1107/s0108768195017174.

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The crystal structures of two modifications (termed A and B) of 4-amidinoindanone guanylhydrazone (AIGH), 2-(4-amidino-1-indanylideneamino)guanidine, have been determined. Modification B, for which single crystals were available, has been treated in the usual manner. The determination of modification A, for which no single crystals were available, was made on the basis of the X-ray powder pattern and ab initio packing calculations. It has been shown that it is possible to determine in a routine manner the crystal structure of a polar and moderately flexible molecule, which can be specified as
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34

Stojković, Vanja, Alexander G. Myasnikov, Iris D. Young, Adam Frost, James S. Fraser, and Danica Galonić Fujimori. "Assessment of the nucleotide modifications in the high-resolution cryo-electron microscopy structure of the Escherichia coli 50S subunit." Nucleic Acids Research 48, no. 5 (2020): 2723–32. http://dx.doi.org/10.1093/nar/gkaa037.

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Abstract Post-transcriptional ribosomal RNA (rRNA) modifications are present in all organisms, but their exact functional roles and positions are yet to be fully characterized. Modified nucleotides have been implicated in the stabilization of RNA structure and regulation of ribosome biogenesis and protein synthesis. In some instances, rRNA modifications can confer antibiotic resistance. High-resolution ribosome structures are thus necessary for precise determination of modified nucleotides’ positions, a task that has previously been accomplished by X-ray crystallography. Here, we present a cry
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35

南, 美英. "The syntactic structure of modification clause and 「,」." Center for Japanese Studies Chung-ang University 40 (February 29, 2016): 49. http://dx.doi.org/10.20404/jscau.2016.02.40.49.

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36

Hang, Yingjie, Jie Ma, Siyuan Li, et al. "Structure–Chemical Modification Relationships with Silk Materials." ACS Biomaterials Science & Engineering 5, no. 6 (2019): 2762–68. http://dx.doi.org/10.1021/acsbiomaterials.9b00369.

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Roman, Barbara, Monika Retajczyk, Łukasz Sałaciński, and Robert Pełech. "Curcumin - Properties, Applications and Modification of Structure." Mini-Reviews in Organic Chemistry 17, no. 5 (2020): 486–95. http://dx.doi.org/10.2174/1570193x16666190621110247.

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In recent years, the interest in biologically active compounds of natural origin has increased significantly. Researchers' research focuses on increasing the activity of curcumin by forming complexes with metals such as vanadium, iron, copper or gallium. Introduction of metal compounds to curcumin increases the scope of application in pharmacology. The main direction of research development is the treatment of tumors, among others stomach cancer or leukemia. Curcuminoids are the main components of turmeric (Curcuma longa L.), a plant from India and South-East Asia. Due to its intense yellow-or
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38

Tonosaki, M., E. Kato, M. Yajima, and Y. Takei. "3D surface modification of micro trenched structure." Vacuum 74, no. 3-4 (2004): 693–98. http://dx.doi.org/10.1016/j.vacuum.2004.01.066.

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Zhang, Y., Z. Shi, Z. Gu, and S. Iijima. "Structure modification of single-wall carbon nanotubes." Carbon 38, no. 15 (2000): 2055–59. http://dx.doi.org/10.1016/s0008-6223(00)00047-6.

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40

Thompson Jr., Guy A. "Metabolism and control of lipid structure modification." Biochemistry and Cell Biology 64, no. 1 (1986): 66–69. http://dx.doi.org/10.1139/o86-010.

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The lipid composition characteristic of a particular cellular membrane can become significantly altered, sometimes quite suddenly, when the cell is placed under environmental stress. In the majority of cases examined, the alterations seem to return the membrane's physical state towards that existing prior to imposition of the stress. The compositional changes are often diverse in their nature and also in their site of origin within the cell. Certain modifications, such as changes in the degree of phospholipid acyl chain unsaturation and in the reordering of fatty acid pairing on specific phosp
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41

Sajjad Athar, M., I. Ruiz Simó, and M. J. Vicente Vacas. "Nuclear medium modification of the structure function." Nuclear Physics A 857, no. 1 (2011): 29–41. http://dx.doi.org/10.1016/j.nuclphysa.2011.03.008.

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42

Kanungo, Rituparna. "Modification of Shell Structure for Unstable Nuclei." Progress of Theoretical Physics Supplement 146 (2002): 422–26. http://dx.doi.org/10.1143/ptps.146.422.

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43

Fatow, M., I. Konyashin, V. Babaev, M. Guseva, V. Khvostov, and N. Savtchenko. "Carbon modification with the fcc crystal structure." Vacuum 68, no. 1 (2002): 75–78. http://dx.doi.org/10.1016/s0042-207x(02)00115-x.

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44

Konyashin, I., V. Babaev, M. Guseva, V. Khvostov, N. Savtchenko, and M. Fatow. "Carbon modification with the fcc crystal structure." Vacuum 66, no. 2 (2002): 175–78. http://dx.doi.org/10.1016/s0042-207x(02)00176-8.

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45

Lee, Sungho, Tack-Rae Kim, Amod A. Ogale, and Myung-Soo Kim. "Surface and structure modification of carbon nanofibers." Synthetic Metals 157, no. 16-17 (2007): 644–50. http://dx.doi.org/10.1016/j.synthmet.2007.07.005.

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46

Eigner, Václav, and Jan Čejka. "Modification of pharmaceutical substances for structure analysis." Acta Crystallographica Section A Foundations of Crystallography 69, a1 (2013): s680. http://dx.doi.org/10.1107/s0108767313094014.

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47

Gray, M. D., and M. G. Edmunds. "Modification of dust-grain structure by sputtering." Monthly Notices of the Royal Astronomical Society 349, no. 2 (2004): 491–502. http://dx.doi.org/10.1111/j.1365-2966.2004.07502.x.

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48

Altman, R. D. "Measurement of structure (disease) modification in osteoarthritis." Osteoarthritis and Cartilage 12 (2004): 69–76. http://dx.doi.org/10.1016/j.joca.2003.09.011.

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Kupper, Dagmar, Jian-Guang Zhou, Pal Venetianer, and Antal Kiss. "Cloning and structure of theBepI modification methylase." Nucleic Acids Research 17, no. 3 (1989): 1077–88. http://dx.doi.org/10.1093/nar/17.3.1077.

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Kliewer, J., R. Berndt, and S. Crampin. "Controlled Modification of Individual Adsorbate Electronic Structure." Physical Review Letters 85, no. 23 (2000): 4936–39. http://dx.doi.org/10.1103/physrevlett.85.4936.

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