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Journal articles on the topic 'Ribbon secondary structure'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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1

Crapster, J. Aaron, Ilia A. Guzei, and Helen E. Blackwell. "A Peptoid Ribbon Secondary Structure." Angewandte Chemie International Edition 52, no. 19 (2013): 5079–84. http://dx.doi.org/10.1002/anie.201208630.

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2

Crapster, J. Aaron, Ilia A. Guzei, and Helen E. Blackwell. "A Peptoid Ribbon Secondary Structure." Angewandte Chemie 125, no. 19 (2013): 5183–88. http://dx.doi.org/10.1002/ange.201208630.

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3

Gray, Lilian, and Peter G. Jones. "Secondary Bonding Interactions in Some Dichloroanilinium Chlorides." Zeitschrift für Naturforschung B 57, no. 1 (2002): 73–82. http://dx.doi.org/10.1515/znb-2002-0109.

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Of the six structures presented here, five involve clearly defined hydrophilic layers built up from classical hydrogen bonding systems. Of three solvent-free structures, 2,4- and 3,5-dichloroanilinium chlorides both form ribbon structures involving annelated R24 (8) rings with NH2 donors (two hydrogen atoms from the positively charged NH3 groups) and chloride acceptors. The ribbons are linked by weaker interactions to form layers. 2,5-Dichloroanilinium chloride forms a layer structure directly, with rings R36 (12) exactly analogous to those previously observed in 2-chloroanilinium chloride. 2,
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4

López-Duplá, Esperanza, Peter G. Jones, and Fabiola Vancea. "Secondary Bonding Interactionsi in Some Di- and Trihaloanilinium Halides." Zeitschrift für Naturforschung B 58, no. 1 (2003): 191–200. http://dx.doi.org/10.1515/znb-2003-0129.

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Abstract Six solvent-free structures of di- and trihaloanilinium halides are presented. All involve clearly defined hydrophilic regions built up from classical hydrogen bonding systems. The 2,4-dibromo-, 2,6- dichloro-, 2,4,6-trichloro- and 2,4,6-tribromoanilinium derivatives form ribbon structures involving annelated R24 (8) rings with NH2 donors (two hydrogens from the positively charged NH3 groups) and halide acceptors. The 2,5-dibromo- and 2,4,5-trichloro derivatives form layers with two types of ring, R24 (8) and R48 (16). All structures also involve other secondary interactions (C-H. . .
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5

Friedrichsa, Friedrichsa, and Peter G. Jones. "Secondary Interactions in Gold(I) Complexes with Thione Ligands, 3. Three Ionic Dimesylamides [1, 2]." Zeitschrift für Naturforschung B 59, no. 11-12 (2004): 1429–37. http://dx.doi.org/10.1515/znb-2004-11-1210.

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Three structures of the form bis(thione)gold(I) di(methanesulfonyl)amide [thione = imidazolidine- 2-thione, 1; 1-methyl-imidazolidine-2-thione, 2; thiazolidine-2-thione, 3] were determined; all crystallize with one formula unit in the asymmetric unit. Each N-H hydrogen bond donor forms one classical two-centre hydrogen bond with an anion acceptor. Compound 1 thereby forms a complex layer structure with a layer thickness of 10.17 Å ; the packing may be analysed in terms of thinner subunit layers consisting of interlinked, hydrogen-bonded chains and rings. Compound 2 forms a chain structure cons
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6

Gray, Lilian, and Peter G. Jones. "Secondary Bonding Interactions in Some Haloanilinium Halides." Zeitschrift für Naturforschung B 57, no. 1 (2002): 61–72. http://dx.doi.org/10.1515/znb-2002-0108.

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The crystal packing in the structures of various solvent-free (mono)haloanilinium halides involves with one exception the formation of approximately planar hydrophilic regions that contain classical hydrogen bonds N-H···X- (X = halogen). Common to the substructures of all layers are rings of general graph set Rn2n(4n), involving equal numbers of chloride acceptors and NH2 moieties (two hydrogen atoms of the positively charged NH3 groups). The 2-substituted derivatives contain the shortest X···X- contacts, and these are within the layers; it could be argued that the contacts are forced upon the
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7

OBERER, Monika, Klaus ZANGGER, Stefan PRYTULLA, and Walter KELLER. "The anti-toxin ParD of plasmid RK2 consists of two structurally distinct moieties and belongs to the ribbon-helix-helix family of DNA-binding proteins." Biochemical Journal 361, no. 1 (2001): 41–47. http://dx.doi.org/10.1042/bj3610041.

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NMR and CD spectroscopy have been used to characterize, both structurally and dynamically, the 82-amino-acid ParD protein of the post-segregational killing module of the broad-host-range plasmid RP4/RK2. ParD occurs as a dimer in solution and exercises two different control functions; an autoregulatory function by binding to its own promoter PparDE and a plasmid-stabilizing function by inhibiting ParE toxicity in cells that express ParD and ParE. Analysis of the secondary structure based on the chemical-shift indices, sequential nuclear Overhauser enhancements (NOEs) and 3JHα-NH scalar couplin
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8

Ren, Zhimin, Chao Chen, Rong Hu, Kaiguang Mai, Guodong Qian, and Zhiyu Wang. "Two-Step Self-Assembly and Lyotropic Liquid Crystal Behavior of TiO2Nanorods." Journal of Nanomaterials 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/180989.

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Several self-assembly structures of anatase TiO2nanorods were obtained by a two-step assembly process, and these structures formed different lyotropic liquid crystal in solution. Primary self-assembly occurred in synthesis process and formed two structures, in the morphology of ribbon and honeycomb, respectively. Secondary-assembly took place when the products were placed at lower temperature, where unique structures were obtained as the relative amount of ribbon and honeycomb changed with the increase of TiO2concentration. These structures showed nematic, spherulites, and lamellar phases. The
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9

Mehlin, H., B. Daneholt, and U. Skoglund. "Structural interaction between the nuclear pore complex and a specific translocating RNP particle." Journal of Cell Biology 129, no. 5 (1995): 1205–16. http://dx.doi.org/10.1083/jcb.129.5.1205.

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The transport of Balbiani ring (BR) premessenger RNP particles in the larval salivary gland cells of the dipteran Chironomus tentans can be followed using electron microscopy. A BR RNP particle consists of an RNP ribbon bent into a ringlike structure. Upon translocation through the nuclear pore complex (NPC), the ribbon is straightened and enters the central channel of the NPC with the 5' end of the transcript in the lead. The translocating ribbon is likely to interact with the central channel but, in addition, the remaining portion of the ribbon ring makes contact with the periphery of the NP
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10

Marquart, Leanna A., Matthew W. Turner, Lisa R. Warner, Matthew D. King, James R. Groome та Owen M. McDougal. "Ribbon α-Conotoxin KTM Exhibits Potent Inhibition of Nicotinic Acetylcholine Receptors". Marine Drugs 17, № 12 (2019): 669. http://dx.doi.org/10.3390/md17120669.

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KTM is a 16 amino acid peptide with the sequence WCCSYPGCYWSSSKWC. Here, we present the nuclear magnetic resonance (NMR) structure and bioactivity of this rationally designed α-conotoxin (α-CTx) that demonstrates potent inhibition of rat α3β2-nicotinic acetylcholine receptors (rα3β2-nAChRs). Two bioassays were used to test the efficacy of KTM. First, a qualitative PC12 cell-based assay confirmed that KTM acts as a nAChR antagonist. Second, bioactivity evaluation by two-electrode voltage clamp electrophysiology was used to measure the inhibition of rα3β2-nAChRs by KTM (IC50 = 0.19 ± 0.02 nM), a
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11

Zirnstein, E. J., J. Heerikhuisen, and D. J. McComas. "STRUCTURE OF THE INTERSTELLAR BOUNDARY EXPLORER RIBBON FROM SECONDARY CHARGE-EXCHANGE AT THE SOLAR–INTERSTELLAR INTERFACE." Astrophysical Journal 804, no. 1 (2015): L22. http://dx.doi.org/10.1088/2041-8205/804/1/l22.

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12

Sorescu, Monica, Felicia Tolea, Mihaela Valeanu, and Mihaela Sofronie. "Structure, Magnetic Properties and Hyperfine Parameters of Nd-Substituted Ni-Fe-Ga Heusler Alloys." MRS Advances 2, no. 25 (2017): 1341–46. http://dx.doi.org/10.1557/adv.2017.70.

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ABSTRACTSamples of Ni57-xNdxFe18Ga25 with x=2 and 4 were prepared in ribbon form by rapid quenching via melt spinning route. The samples were analyzed by X-ray diffraction (XRD), magnetic measurements and Mössbauer spectroscopy, both in the as-quenched form and after thermal annealing at 900 oC for 2 min and 400 °C for 2 hours. For x=2 the Nd atoms are completely dissolved in the Ni-Fe-Ga matrix, while for x=4 the additional occurrence of the secondary 2:17 phase could be resolved. These findings were supported by the analysis of hyperfine magnetic field distributions obtained from the non-lin
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13

Bergholz, W., and J. L. Hutchison. "Early stages of oxygen precipitation in si: morphology and structure." Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988): 478–79. http://dx.doi.org/10.1017/s0424820100104455.

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Intrinsic gettering in Si - VLSI technology depends on a controlled initial stage of oxygen precipitation and is characterized by a complicated interaction of growth-induced microdefects, self interstitial (SiI) generation and strain caused by SiO2 precipitate growth and secondary defects, table 1. We address the controversial issues of the identity of ribbon-like defects (RLDs) and of the nature of oxygen precipitate nuclei.RLDs were initially identified by HRTEM as coesite, a high pressure phase of SiO2. Recently, both Bourret and Reiche et al have interpreted the RLDs as hexagonal Si, or ag
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14

Smith, Graham, and Daniel E. Lynch. "Cyclic heterotetrameric and low-dimensional hydrogen-bonded polymeric structures in the morpholinium salts of ring-substituted benzoic acid analogues." Acta Crystallographica Section C Structural Chemistry 72, no. 2 (2016): 105–11. http://dx.doi.org/10.1107/s2053229615024821.

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The morpholinium (tetrahydro-2H-1,4-oxazin-4-ium) cation has been used as a counter-ion in both inorganic and organic salt formation and particularly in metal complex stabilization. To examine the influence of interactive substituent groups in the aromatic rings of benzoic acids upon secondary structure generation, the anhydrous salts of morpholine with salicylic acid, C4H10NO+·C7H5O3−, (I), 3,5-dinitrosalicylic acid, C4H10NO+·C7H3N2O7−, (II), 3,5-dinitrobenzoic acid, C4H10NO+·C7H3N2O6−, (III), and 4-nitroanthranilic acid, C4H10NO+·C7H5N2O4−, (IV), have been prepared and their hydrogen-bonded
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15

HAN, H. L., and V. S. KONONENKO. "Replacement names for two species of Noctuidae (Lepidoptera)." Zootaxa 3573, no. 1 (2012): 66. http://dx.doi.org/10.11646/zootaxa.3573.1.8.

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In the course of research on the Eustrotiinae (Noctuidae) we have determined that the African species Eustrotia bella Bethune-Baker, 1911 (nomenclature according to Poole 1989) is congeneric with Maliattha separata Walker, 1863, the type-species of Maliattha Walker, 1863. Characters of Maliattha shared with bella Bethune-Baker are the small size, structure of the palpi and characteristic wing pattern, and male genitalic features including a short uncus, lacking a harpe, a long ribbon-like transtilla, and the presence of a clavus and small sclerotised claws on the tip of the valva (Figs. 1–6).
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16

Varsaki, Athanasia, Gabriel Moncalián, Maria del Pilar Garcillán-Barcia, Constantin Drainas, and Fernando de la Cruz. "Analysis of ColE1 MbeC Unveils an Extended Ribbon-Helix-Helix Family of Nicking Accessory Proteins." Journal of Bacteriology 191, no. 5 (2008): 1446–55. http://dx.doi.org/10.1128/jb.01342-08.

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ABSTRACT MbeC is a 13-kDa ColE1-encoded protein required for efficient mobilization of ColE1, a plasmid widely used in cloning vector technology. MbeC protein was purified and used for in vitro DNA binding, which showed that it binds specifically double-stranded DNA (dsDNA) containing the ColE1 oriT. Amino acid sequence comparison and secondary structure prediction imply that MbeC is related to the ribbon-helix-helix (RHH) protein family. Alignment with RHH members pointed to a conserved arginine (R13 in MbeC) that was mutated to alanine. The mutant MbeC(R13A) was unable to bind either single-
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17

Liu, Chun-Sen, Min Hu, Song-Tao Ma, et al. "Coordination Polymers with a Bulky Perylene-Based Tetracarboxylate Ligand: Syntheses, Crystal Structures, and Luminescent Properties." Australian Journal of Chemistry 63, no. 3 (2010): 463. http://dx.doi.org/10.1071/ch09411.

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To explore the coordination possibilities of perylene-based ligands with a larger conjugated π-system, four ZnII, MnII, and CoII coordination polymers with perylene-3,4,9,10-tetracarboxylate (ptc) and the chelating 1,10-phenanthroline (phen) ligands were synthesized and characterized: {[Zn2(ptc)(phen)2](H2O)10}∞ (1), {[Zn3(ptc)(OH)2(phen)2](H2O)3}∞ (2), {[Mn(ptc)0.5(phen)(H2O)2](H2O)1.5}∞ (3), and {[Co(ptc)0.5(phen)(H2O)2](H2O)2.5}∞ (4). Structural analysis reveals that complexes 1 and 2 both take one-dimensional polymeric chain structures with dinuclear and trinuclear units as nodes, respecti
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18

Bhadbhade, Mohan, Jiabin Gao, Christopher Marjo, and James Hook. "A Persistent N-H...N Ribbon Motif in the Crystal Structures of Triazine Herbicides." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C535. http://dx.doi.org/10.1107/s2053273314094649.

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Triazines have been used for many years as herbicides, but we now report for the first time the crystal structures of two ubiquitous exemplars, Simazine 1 (R = ethyl) and Atrazine 2 (R = i-propyl, 2 polymorphs), which were possible only with the Synchrotron diffraction measurements. Analysis of the crystal structures reveals infinite molecular ribbons (I) comprising centrosymmetric N-H..N hydrogen bonds, with weaker secondary C-H...Cl interactions. The hydrogen bonding constrains each molecule into a very specific conformation, yet the ribbon is conserved across 1 and both polymorphs of 2. Acc
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19

Ponnu Krishnan, P., and J. Selwin Rajadurai. "Microscopical, physico-chemical, mineralogical, and mechanical characterization of Sansevieria zeylanica fibers as potential reinforcement of composite structures." Journal of Composite Materials 51, no. 6 (2016): 811–29. http://dx.doi.org/10.1177/0021998316653461.

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The aim of this article is to examine for the first time the morphological, physical, chemical, mechanical, and thermal properties of a new kind of fibers, extracted from the leaves of a plant of the Asparagaceae family, to make it possible to use them as potential reinforcement for composite structures. The fibers were extracted from the leaves of Sansevieria zeylanica by decortication process. The presence of mechanical fibers and ribbon fibers were identified through the anatomy of Sansevieria zeylanica leaves. The hierarchical cell structure of these fibers was analyzed through polarized o
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20

Yuan, Jian-Jun, and Ren-Hua Jin. "Approaches to nanostructure control and functionalizations of polymer@silica hybrid nanograss generated by biomimetic silica mineralization on a self-assembled polyamine layer." Beilstein Journal of Nanotechnology 2 (November 23, 2011): 760–73. http://dx.doi.org/10.3762/bjnano.2.84.

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We report the rational control of the nanostructure and surface morphology of a polyamine@silica nanoribbon-based hybrid nanograss film, which was generated by performing a biomimetic silica mineralization reaction on a nanostructured linear polyethyleneimine (LPEI) layer preorganized on the inner wall of a glass tube. We found that the film thickness, size and density of the nanoribbons and the aggregation/orientation of the nanoribbons in the film were facile to tune by simple adjustment of the biomimetic silicification conditions and LPEI self-assembly on the substrate. Our LPEI-mediated na
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21

Lynn, Denis H., and Kenneth H. Nicholls. "Cortical microtubular structures of the ciliate Lepidotrachelophyllum fornicis Nicholls &Lynn, 1984 and phytogeny of the litostomate ciliates." Canadian Journal of Zoology 63, no. 8 (1985): 1835–45. http://dx.doi.org/10.1139/z85-274.

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The somatic and oral cortical ultrastructure of Lepidotrachelophyllum fornicis Nicholls &Lynn, 1984 are described. The somatic kinetids are monokinetids whose fibrillar associates include the following: (i) a kinetodesmal fibril which originates near triplets 6, 7, and 8 and extends laterally and to the right at an angle of about 45° to the longitudinal axis of the kinety; (ii) a postciliary ribbon which originates in dense material near triplet 9 and extends posteriorly and to the right; (iii) a primary transverse ribbon which originates near triplets 3, 4, and 5 and extends to the left a
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22

Kar, Soumitra, Swadeshmukul Santra, and Subhadra Chaudhuri. "Direct Synthesis of ZnS Nanoribbons, Micro-Sheets and Tetrapods." Journal of Nanoscience and Nanotechnology 8, no. 6 (2008): 3222–27. http://dx.doi.org/10.1166/jnn.2008.150.

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ZnS nano and micro structures such as nanoribbons, large sheets and tetrapod shaped crystals were fabricated by direct thermal evaporation of ZnS powder without using any catalyst. Formation of the one dimensional structures such as nanoribbons and micron order sheets was attributed to the vapor-solid growth mechanism. The formation of octahedron nucleus with cubic crystal structures was proposed as the growth unit of the wurtzite crystal structured tetrapods. Appearance of the periodic stacking faults or twining planes in between alternate cubic and hexagonal crystal structured zones along th
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23

Makridis, Sofoklis S. "Structural and Magnetic Properties of Sm(CobalFe0.1Ni0.12Zr0.04B0.04)7.5 Melt Spun Ribbons." Materials Science Forum 636-637 (January 2010): 404–10. http://dx.doi.org/10.4028/www.scientific.net/msf.636-637.404.

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We have investigated the structural and magnetic properties of Sm(Co0.70Fe0.1Ni0.12Zr0.04B0.04)7.5 melt spun ribbons. The arc-melted bulk samples have been used to obtain ribbons at 37 up to 55 m/sec while annealing has been performed in argon atmosphere for 30-75 min at 600-870 oC. In as-spun ribbons the hexagonal SmCo7 (TbCu7-type of structure) of crystal structure has been determined from x-ray diffraction patterns, while fcc-Co has been identified as a secondary phase. After annealing, the 1:7 phase of the as-spun ribbons transforms into 2:17 and 1:5 phases. TEM analysis shows a homogeneou
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24

Xue, Jun, Cui-Cui Zhao, and Zi-Yi Du. "Melaminium (2-carboxyethyl)(phenyl)phosphinate monohydrate." Acta Crystallographica Section C Crystal Structure Communications 68, no. 9 (2012): o355—o358. http://dx.doi.org/10.1107/s0108270112033392.

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Cocrystallization of melamine (1,3,5-triazine-2,4,6-triamine, ma) with (2-carboxyethyl)(phenyl)phosphinic acid (H2L) from water affords the title compound, C3H7N6+·C9H10O4P−·H2O or (maH)(HL)·H2O, (I). The phosphinic acid H atom of each H2Lmolecule is transferred to a melamine molecule. Structural analysis reveals that there are two types of secondary building units in the crystal structure, namely cationic [(maH+)2]∞ribbons and anionic {[(HL)2(H2O)2]2−}∞layers, the combination of which through hydrogen-bond and electrostatic interactions, generates a large-scale two-dimensional layered structu
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25

Li, Li Ya, Jian Hong Yi, Ai Kun Li, and Yuan Dong Peng. "Investigation of Magnetic Behavior of SmCo5/SmCo2 Nanocrystalline Magnets." Applied Mechanics and Materials 303-306 (February 2013): 2644–47. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.2644.

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Nanocrystalline magnets (SmCo5)94(Cr3C2)6 were prepared using melt-spinning and their magnetic behaviors were investigated by studying their structures and magnetic properties. The alloys prepared using rapid solidification consisted of SmCo5 matrix phase, MgCu2-type SmCo2 secondary phase, and small traces of Sm2Co7 phase. The solidification with higher wheel speed were found to be preferable for the formation of single SmCo2 secondary phase. Relatively high coercive values of 28–36 kOe and high reduced remanence of 0.78–0.79 were observed for the SmCo5/SmCo2 nanocrystalline magnets. The shape
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26

Friedrichs, Steffi, and Peter G. Jones. "Secondary Interactions in Gold(I) Complexes with Thione Ligands, 4. Three Further Salts of the Bis(imidazolidine-2-thione)gold(I) Cation [1, 2]." Zeitschrift für Naturforschung B 61, no. 11 (2006): 1391–400. http://dx.doi.org/10.1515/znb-2006-1112.

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Three structures of the form bis(imidazolidine-2-thione)gold(I) disulfonylamide [disulfonylamide = benzene-1,2-di(sulfonyl)amide (1), di(4-chlorobenzenesulfonyl)amide (2), di(4-iodobenzenesulfonyl) amide (3)] were determined. Compound 3 crystallizes with four independent formula units. The cations in 1 and 3 show an antiperiplanar conformation about the S···S axis, whereas the corresponding torsion angle in 2 is 72°. The packing in 1 consists of linked ribbons in which the NH groups of neighbouring cations are bridged by O-S-O groups of the anions. Compound 2 exhibits a complex layer structure
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27

Hu, Binying, Xiuqin Bai, Yifeng Fu, and Chengqing Yuan. "Drag Reduction Performance Analysis of Chlamys nobilis Ribbed Surface." Marine Technology Society Journal 53, no. 1 (2019): 43–52. http://dx.doi.org/10.4031/mtsj.53.1.6.

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AbstractConsidering the fact that the living condition of the shell is similar to the significant defiled environment of a ship, it is selected as a bionic object to study drag reduction for ship hulls. Previous studies have demonstrated that the special physical structure of the shell surface results in preventing biological adhesion. In order to improve ship operation efficiency, collaborative research on the physical structure was first carried out by studying the drag reduction performance of the actual Chlamys nobilis surface among the antifouling ranges of the structural dimensions witho
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28

Zervou, M., A. Andreou, C. Matalliotaki, T. Niewold, G. Goulielmos, and E. Eliopoulos. "THU0027 THE ASSOCIATION OF THE RS35677470 DNASE1L3 GENE POLYMORPHISM WITH SLE, RA AND SSC: STRUCTURAL/BIOLOGICAL INSIGHTS." Annals of the Rheumatic Diseases 79, Suppl 1 (2020): 226.1–227. http://dx.doi.org/10.1136/annrheumdis-2020-eular.1150.

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Background:Genome-wide association studies (GWAS) have identified hundreds of autoimmune diseases-associated loci so far but much of the heritability of these diseases remains unknown. In an attempt to identify potential causal variants, various studies revealed that the missense variant rs35677470 atDNASE1L3is associated with the development of systemic lupus erythematosus (SLE), rheumatoid arthritis (RA) and systemic sclerosis (SSc), thus exhibiting a pleiotropic effect. Deoxyribonuclease I-like 3 (DNase1L3) is a member of human DNase I family, representing a nuclease that cleaves double-str
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29

Ferrández, D., C. Morón, P. Saiz, and A. Morón. "Magnetic variation in construction steels under tensile stress. Empirical research with Helmholtz coils." Materiales de Construcción 71, no. 341 (2021): e243. http://dx.doi.org/10.3989/mc.2021.06020.

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Steel is responsible for providing resistance to flexotraction to reinforced concrete structures. Steel is responsible for providing reinforced concrete structures with a flexural strength. For this reason, it is important to study its behaviour under different tensile states. This study used measuring equipment that was able to determine variations in magnetic properties of B500-SD steel bars during standard tensile tests. The magnetic field generated by a Helmholtz coil was collected through a secondary circuit. This enables the induced electromotive force to relate with the steel deflection
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30

Shin, Jong Won, Dae-Woong Kim та Dohyun Moon. "Crystal structure oftrans-(1,8-dibutyl-1,3,6,8,10,13-hexaazacyclotetradecane-κ4N3,N6,N10,N13)bis(isonicotinato-κO)nickel(II) determined from synchrotron data". Acta Crystallographica Section E Crystallographic Communications 72, № 2 (2016): 223–25. http://dx.doi.org/10.1107/s2056989016001031.

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The title compound, [Ni(C6H4NO2)2(C16H38N6)], was prepared through self-assembly of a nickel(II) azamacrocyclic complex with isonicotinic acid. The NiIIatom is located on an inversion center and exhibits a distorted octahedral N4O2coordination environment, with the four secondary N atoms of the azamacrocyclic ligand in the equatorial plane [average Ni—Neq= 2.064 (11) Å] and two O atoms of monodentate isonicotinate anions in axial positions [Ni—Oax= 2.137 (1) Å]. Intramolecular N—H...O hydrogen bonds between one of the secondary amine N atoms of the azamacrocyclic ligand and the non-coordinatin
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31

Tedesco, Consiglia, Eleonora Macedi, Alessandra Meli, et al. "Synthesis, crystallization, X-ray structural characterization and solid-state assembly of a cyclic hexapeptoid with propargyl and methoxyethyl side chains." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 73, no. 3 (2017): 399–412. http://dx.doi.org/10.1107/s2052520617002505.

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The synthesis and the structural characterization of a cyclic hexapeptoid with four methoxyethyl and two propargyl side chains have disclosed the presence of a hydrate crystal form [form (I)] and an anhydrous crystal form [form (II)]. The relative amounts of form (I) and form (II) in the as-purified product were determined by Rietveld refinement and depend on the purification procedures. In crystal form (I), peptoid molecules assemble in a columnar arrangement by means of side-chain-to-backbone C=CH...OC hydrogen bonds. In the anhydrous crystal form (II), cyclopeptoid molecules form ribbons by
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32

Schulz, Burkhard, Birgit Dietzel, Ingo Orgzall, Isabel Díez, and Chenggang Xu. "Aspects of Morphology Control during the Oxidative Synthesis of Electrically Conducting Polymers." High Performance Polymers 21, no. 5 (2009): 633–52. http://dx.doi.org/10.1177/0954008309339933.

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The formation of micro- and nanostructures during the oxidative polymerization of polypyrrole and polyaniline is investigated using different sulfonic acid dopants. Rod- or tube-like structures are found in polypyrrole as well as in polyaniline without addition of further compounds to the initial reaction mixture of monomer, dopant and oxidant. In these cases, always a crystalline precursor complex composed of a dopand molecule and the pure monomer (aniline) or a trimeric moiety (pyrrole) serves as in-situ template. In most cases the surface of the growing polymer is covered by secondary struc
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33

Pagel, Kevin, Sara C. Wagner, Kerim Samedov, Hans von Berlepsch, Christoph Böttcher та Beate Koksch. "Random Coils, β-Sheet Ribbons, and α-Helical Fibers: One Peptide Adopting Three Different Secondary Structures at Will". Journal of the American Chemical Society 128, № 7 (2006): 2196–97. http://dx.doi.org/10.1021/ja057450h.

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34

Kucala, Alec, and Sedat Biringen. "Spatial simulation of channel flow instability and control." Journal of Fluid Mechanics 738 (December 4, 2013): 105–23. http://dx.doi.org/10.1017/jfm.2013.532.

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AbstractA direct numerical simulation is performed on the full time-dependent three-dimensional Navier–Stokes equations in a spatially developing plane-channel flow at a Reynolds number of 10 000. Two-dimensional eigenfunctions based on the solution of the Orr–Sommerfeld equation are introduced at the inflow with random noise added to simulate a vibrating ribbon transition experiment. The flow is allowed to choose a natural path to secondary instability, either K-type (after Klebanoff) or H-type (after Herbert), depending on the amplitude of the two-dimensional disturbance. For low-amplitude t
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35

Barr, D. J. S., and N. L. Désaulniers. "The flagellar apparatus in zoospores of Phytophthora, Pythium, and Halophytophthora." Canadian Journal of Botany 70, no. 11 (1992): 2163–69. http://dx.doi.org/10.1139/b92-267.

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The flagellar apparatuses of 14 species of Phytophthora, 2 of Halophytophthora, and 4 of Pythium are compared in the transmission electron microscope. Except for Phytophthora infestans and Phytophthora mirabilis there were no significant differences in fine structure morphology. There are six flagellar roots: a ribbed triplet consisting of three main microtubules and secondary microtubules; an anterior doublet; a multistranded, band-shaped root of five to nine microtubules; a posterior root of two to four microtubules; and roots consisting of arrays of cytoplasmic microtubules and nuclear-asso
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36

Dutta, S., and J. C. Han. "Local Heat Transfer in Rotating Smooth and Ribbed Two-Pass Square Channels With Three Channel Orientations." Journal of Heat Transfer 118, no. 3 (1996): 578–84. http://dx.doi.org/10.1115/1.2822671.

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This paper presents experimental heat transfer results in a two-pass square channel with smooth and ribbed surfaces. The ribs are placed in a staggered half-V fashion with the rotation orthogonal to the channel axis. The channel orientation varies with respect to the rotation plane. A change in the channel orientation about the rotating frame causes a change in the secondary flow structure and associated flow and turbulence distribution. Consequently, the heat transfer coefficient from the individual surfaces of the two-pass square channel changes. The effects of rotation number on local Nusse
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37

Kocjan, Andraž, Luka Kelhar, Anton Gradišek, et al. "Solid Solubility in Cu5Gd1−xCax System: Structure, Stability, and Hydrogenation." Advances in Materials Science and Engineering 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/9203623.

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We report on synthesis and characterization of a novel group of compounds based on copper, gadolinium, and calcium. Cu-Ca and Cu-Gd binaries were previously studied while Ca and Gd are known to be immiscible themselves. The effects of substituting Gd with Ca in Cu5Gd1-xCax compounds (0≤x≤1) were studied by investigating the phase stability and crystal structure of the resulting new compounds in five specimens with x = 0, 0.33, 0.50, 0.66, and 1, respectively. The samples produced by melt-spinning had hexagonal P6/mmm structure, irrespective of Ca amount (x), where lattice parameters varied wit
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38

Barr, D. J. S., and N. L. Désaulniers. "The flagellar apparatus in the Phytophthora infestans zoospore." Canadian Journal of Botany 68, no. 10 (1990): 2112–18. http://dx.doi.org/10.1139/b90-276.

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The Phytophthora infestans zoospore contains five out of six rootlets that are found in other secondary-type oomycetous zoospores. They include (i) an anterior ribbed rootlet (AR4) that runs along the right side of the anterior groove and consists of four main microtubules, an electron-opaque cord, and secondary (rib) microtubules; (ii) an anterior rootlet (A2) that runs on the left side of the anterior groove and consists of two microtubules; (iii) a posterior rootlet (P6) that runs on the left side of the posterior groove and consists of six microtubules; (iv) an array of cytoplasmic microtu
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39

Hetherington, C. J. D., U. Dahmen, P. Pirouz, and K. H. Westmacott. "HREM of twin intersections in Silicon." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 132–33. http://dx.doi.org/10.1017/s042482010015263x.

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A twin band is an effective barrier to the propagation of another, noncoplanar twin band. However, under conditions of sufficiently high local stress, twin intersections are possible. The geometric configuration of intersecting twin bands has been considered in the past in the context of dislocation mechanisms and deformation behavior. Observations on plane-strain deformed Co-8wt%Fe single crystals showed that intersecting twins gave rise to highly complex local deformation structures and led to the conclusion that the strain in the region of intersection was accommodated either by slip or by
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40

Zahedi, Mansoureh, Behrouz Shaabani, Ulli Englert, and Jan van Leusen. "Organic-inorganic hybrid materials from divalent metal cations and expanded N,N′-donor linkers." Zeitschrift für Kristallographie - Crystalline Materials 233, no. 2 (2018): 97–111. http://dx.doi.org/10.1515/zkri-2017-2084.

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AbstractThe rod-shaped linker (E,E)-N,N′-(3,3′-dimethyl-4,4′-biphenyldiyl)bis[1-(3-pyridinyl)methanimine] (L) is exploited for the first time in the synthesis of extended structures. Four new coordination polymers of composition {[ZnL(OAc)2]·EtOH}n(1), {[CdL(OAc)2]·MeOH}n(2), {[Cu2L(OAc)4]·CH2Cl2}n(3) and [MnL(N3)2]n(4) have been structurally characterized. The metal cations and the anionic ancillary ligands play pivotal roles for the topology of these compounds. In the crystalline reaction products of Zn(II), Cd(II) and Cu(II) acetate with the organic linker, the acetate anions connects two n
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41

Weryszko-Chmielewska, Elżbieta, Mirosław Chwil, and Marek Wróbel. "The position and structure of the nectary in spring heath (Erica carnea L.) flowers." Acta Agrobotanica 62, no. 2 (2012): 13–21. http://dx.doi.org/10.5586/aa.2009.022.

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Ecological traits of <i>Erica carnea</i> L. flowers and the morphology of floral nectaries were investigated using stereoscopic, light and scanning electron microscopy. The nectary in the flowers of <i>Erica carnea</i> is located in the basal part of the ovary. It represents the gynoecial nectary type. It has the form of a yellow, ribbed ring with eight outgrowths, pointed towards the base, which alternately adjoin the stamen filaments. The height of the nectary is 400 µm and its thickness 200 - 250 µm. The parenchyma of the nectary is composed of 6 - 8 layers. Nectar s
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42

Kekule, Tomáš, Martin Vlach, Hana Kudrnova, Veronika Kodetova, Bohumil Smola, and Ivana Stulíková. "Annealing Effects in Mg-Y-Zn Alloys Prepared by Powder Metallurgy and by Squeeze Casting." Defect and Diffusion Forum 353 (May 2014): 183–88. http://dx.doi.org/10.4028/www.scientific.net/ddf.353.183.

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Response to isochronal annealing up to 440°C was investigated in squeeze cast Mg2Y1Zn alloy and in the same alloy prepared by powder metallurgy and extrusion at 280°C (PM). Electrical resistivity measurements at 77 K and at room temperature after each annealing step and differential scanning calorimetry performed at various heating rates characterized phase changes proceeding during the heat treatments. Transmission and scanning electron microscopy and optical microscopy revealed ribbons of a long-period ordered structure and a relatively high density of stacking faults in grain interiors of t
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43

Barr, Donald J. S., and Nicole L. Désaulniers. "Ultrastructure of the Lagena radicicola zoospore, including a comparison with the primary and secondary Saprolegnia zoospores." Canadian Journal of Botany 65, no. 10 (1987): 2161–76. http://dx.doi.org/10.1139/b87-298.

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The zoospore fine structure of Lagena radicicola Vanterpool & Ledingham is compared with the primary and secondary zoospores of Saprolegnia diclina Humphrey. The L. radicicola zoospore is broadly pyriform, it has two subapically attached flagella, a pyriform nucleus that has a fine fibrillar attachment to the posterior kinetosome, and a Golgi body next to the nucleus. There are various vesicles including dense body vesicles and several small expulsion vacuoles but there are no U- or K-bodies. It has a well-organized rootlet system comprising anterior and posterior doublet microtubules, a r
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44

Walbaum, Christine, Ingo Pantenburg, and Gerd Meyer. "Penta-, Hepta- und Oktaiodid-Anionen in Salzen mit Erdalkalimetall-Kronenether-Kationen / Penta-, Hepta-, and Octaiodide Anions in Salts with Alkaline Earth Metal Crown Ether Cations." Zeitschrift für Naturforschung B 65, no. 9 (2010): 1077–83. http://dx.doi.org/10.1515/znb-2010-0904.

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Salts of alkaline earth metal cations sequestered in dibenzo-18-crown-6 (Db18c6) and benzo-15- crown-5 (B15c5), respectively, with I5−, I7− and I82− as the anions, have been synthesized and their crystal structures determined by single-crystal X-ray diffraction. [Ca(Db18c6)(H2O)3](I5)2- (Db18c6)(H2O) (1): monoclinic, P21 (no. 4), a = 1322.1(2), b = 1849.1(2), c = 1344.0(2) pm, β = 114.70(1)◦, V = 2985.2(6) × 106 pm3, Z = 2; [Sr(B15c5)2](I7)2 (2): triclinic, P1 (no. 2), a = 973.9(5), b = 1244.0(5), c = 1293.3(5) pm, α = 115.28(1), β = 90.18(1), γ = 104.57(1)◦, V = 1360.2(10) × 106 pm3, Z = 2; [
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45

Rong, M. H., J. Ma, Jiang Wang, H. Y. Zhou, and G. H. Rao. "Microstructure and Magnetic Properties of (Nd1-2xPrxYx)2.28Fe13.58B1.14 Melt-Spun Alloys." Materials Science Forum 898 (June 2017): 1242–46. http://dx.doi.org/10.4028/www.scientific.net/msf.898.1242.

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As a rapid solidification technology, strip casting (SC) technology is one of importance method in the production of Nd2Fe14B-based rare-earth permanent magnets. (Nd1-2xPrxYx)2.28Fe13.58B1.14 (x=0.05, 0.10, 0.15, 0.20) alloys prepared by arc melting method under an argon atmosphere were annealed at 1173 K for 360 hrs and then were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Differential Scanning Calorimetry (DSC). Magnetic properties of the ribbons prepared by melt-spinning method with high cooling rate were measured by Physical Property Measurement System (
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46

Gao, Xiufang, and Bengt Sunde´n. "Effects of Inclination Angle of Ribs on the Flow Behavior in Rectangular Ducts." Journal of Fluids Engineering 126, no. 4 (2004): 692–99. http://dx.doi.org/10.1115/1.1778715.

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The flow behavior in rib-roughened ducts is influenced by the inclination of ribs and the effect is investigated in the present study by Particle Image Velocimetry (PIV). The local flow structures between two adjacent ribs were measured. The Reynolds number was fixed at 5800. The flow field description was based on the PIV results in planes both parallel and perpendicular to the ribbed walls at various locations. The rib angle to the main flow direction was varied as 30 deg, 45 deg, 60 deg and 90 deg. The ribs induce three dimensional flow fields. The flow separation and reattachment between a
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47

PERALTA, C., A. MELATOS, M. GIACOBELLO, and A. OOI. "Superfluid spherical Couette flow." Journal of Fluid Mechanics 609 (July 31, 2008): 221–74. http://dx.doi.org/10.1017/s002211200800236x.

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We solve numerically for the first time the two-fluid Hall–Vinen–Bekarevich–Khalatnikov (HVBK) equations for an He-II-like superfluid contained in a differentially rotating spherical shell, generalizing previous simulations of viscous spherical Couette flow (SCF) and superfluid Taylor–Couette flow. The simulations are conducted for Reynolds numbers in the range 1 × 102≤Re≤3 × 104, rotational shear 0.1≤ΔΩ/Ω≤0.3, and dimensionless gap widths 0.2≤δ≤0.5. The system tends towards a stationary but unsteady state, where the torque oscillates persistently, with amplitude and period determined by δ and
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48

Copper, Paul. "Davidsonia and Rugodavidsonia (new genus), cryptic Devonian atrypid brachiopods from Europe and South China." Journal of Paleontology 70, no. 4 (1996): 588–602. http://dx.doi.org/10.1017/s0022336000023556.

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The fixosessile, perireefal to reefal Devonian epibiont Davidsonia cemented itself by its entire ventral valve to the underside of alveolitid tabulate corals, or to stromatoporoid sponges. It occupied a cryptic niche in perireefal biostromal thickets to reef complexes in the Old World faunal realm (Europe, western North America), and Uralian–Central Asian faunal province. A new species, D. septata, is here reported in abundance for the first time from Middle Devonian (Givetian) rocks of Yunnan, thus extending its range to South China. The usual absence of the brachial valve is suggested to be
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49

Jamieson-Binnie, Alexander D., and David R. Glowacki. "Visual Continuity of Protein Secondary Structure Rendering: Application to SARS-CoV-2 Mpro in Virtual Reality." Frontiers in Computer Science 3 (July 12, 2021). http://dx.doi.org/10.3389/fcomp.2021.642172.

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Ribbon diagrams are important for protein visualization, used to convey the secondary structure in a clear and concise manner. However, most algorithms used to generate these diagrams do not maintain visual continuity when viewing a molecular trajectory, with certain sections of ribbons flipping between clockwise and counterclockwise twists. Here we outline a new method which prevents this artifact by morphing between consecutive cross sections instead of rotating. This yields diagrams which are well suited for viewing dynamic simulations, such as those used for interactive molecular dynamics.
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50

Tilly, Daniel J., J. P. A. Löfvander, and C. G. Levi. "In-Situ Growth of SiC in MoSi2 by Melt Processing." MRS Proceedings 273 (1992). http://dx.doi.org/10.1557/proc-273-295.

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ABSTRACTThe growth of SiC during solidification of Mo-Si-C melts was investigated to explore the potential for developing in-situ refractory reinforcements for MoSi2 matrices. Volume fractions of up to 20% were readily incorporated by arc melting. Primary β-SiC grows as equiaxed particles, plates and hopper crystals, whereas secondary SiC grows with ribbon, thin flake or whisker morphologies. The dominant facets of both primary and secondary SiC are of the (111) and {002) type, which are also characteristic of the equilibrium crystal shape. There is a clear orientation relationship between the
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