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Journal articles on the topic 'Ring formation'

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Published: 4 June 2021

Last updated: 19 February 2023

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1

Guosheng Wang, Guosheng Wang, and Siyu Han and Ronghui Xu Siyu Han and Ronghui Xu. "The Ring Formation Mechanism in Cyclization of Berberine." Journal of the chemical society of pakistan 43, no. 3 (2021): 308. http://dx.doi.org/10.52568/000578/jcsp/43.03.2021.

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Berberine hydrochloride is a natural alkaloid with significant antitumor activities against many types of cancer cells, can be synthesized by cyclic reaction with hydrochloride condensate and glyoxal as raw materials and copper chloride as catalyst. In this study, the transition and energy change for the each reaction step was calculated by the density functional theory program Dmol3 in Materials Studio 2017. and the results testified that there are two ring formation in the cycliztion process, and according to the result we proposed the mechanism of this cyclization reaction. We also use infrared and ultraviolet spectroscopy to monitor the reaction process in real time and prove the ring formation process. The reaction mechanism was firstly proposed at the basic results of above.

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2

Guosheng Wang, Guosheng Wang, and Siyu Han and Ronghui Xu Siyu Han and Ronghui Xu. "The Ring Formation Mechanism in Cyclization of Berberine." Journal of the chemical society of pakistan 43, no. 3 (2021): 308. http://dx.doi.org/10.52568/000578.

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Berberine hydrochloride is a natural alkaloid with significant antitumor activities against many types of cancer cells, can be synthesized by cyclic reaction with hydrochloride condensate and glyoxal as raw materials and copper chloride as catalyst. In this study, the transition and energy change for the each reaction step was calculated by the density functional theory program Dmol3 in Materials Studio 2017. and the results testified that there are two ring formation in the cycliztion process, and according to the result we proposed the mechanism of this cyclization reaction. We also use infrared and ultraviolet spectroscopy to monitor the reaction process in real time and prove the ring formation process. The reaction mechanism was firstly proposed at the basic results of above.

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3

Tuma, Rabiya S. "Contractile ring formation." Journal of Cell Biology 174, no. 3 (July 24, 2006): 319b. http://dx.doi.org/10.1083/jcb.1743iti5.

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4

Pellissier, Hélène. "The Use of Domino Reactions for the Synthesis of Chiral Rings." Synthesis 52, no. 24 (July 22, 2020): 3837–54. http://dx.doi.org/10.1055/s-0040-1707905.

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This short review highlights the recent developments reported in the last four years on the asymmetric construction of chiral rings based on enantioselective domino reactions promoted by chiral metal catalysts.1 Introduction2 Formation of One Ring Containing One Nitrogen Atom3 Formation of One Ring Containing One Oxygen/Sulfur Atom4 Formation of One Ring Containing Several Heterocyclic Atoms5 Formation of One Carbon Ring6 Formation of Two Rings7 Conclusion

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5

Combes, Françoise. "Ring and Lens Formation." International Astronomical Union Colloquium 157 (1996): 286–98. http://dx.doi.org/10.1017/s0252921100049927.

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AbstractThe dynamical mechanism to form rings at Lindblad resonances in a barred galaxy is now well-known: due to its dissipative character, the gas is forced in a spiral structure, and experiences torques from the bar potential. Angular momentum is transferred until gas accumulates in the resonant rings. Some problems remain however to account for all observations, such as the very different time-scales for nuclear, inner and outer ring formation, while the three are frequently observed in the same galaxy; the shapes, orientations and thickness of the rings, etc... The adequacy of the present gas dynamical modelizations is discussed.Lenses are secondary components of barred galaxies that could originate from bar evolution. No model until now has met the observational constraints, in particular the sharp edge of the lenses, their strong velocity anisotropy, and their small thickness. We propose here that lenses are the result of partial bar destruction, a necessary step in a feedback cycle of bar formation-destruction, a cycle driven by gas accretion.

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6

Kim, Woong-Tae, Woo-Young Seo, and Yonghwi Kim. "Formation of nuclear rings of barred galaxies and star formation therein." Proceedings of the International Astronomical Union 9, S303 (October 2013): 43–53. http://dx.doi.org/10.1017/s174392131400012x.

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AbstractBarred galaxies contain substructures such as a pair of dust lanes and nuclear rings, with the latter being sites of intense star formation. We study the substructure formation as well as star formation in nuclear rings using numerical simulations. We find that nuclear rings form not by the Lindblad resonances, as previously thought, but by the centrifugal barrier that inflowing gas along dust lanes cannot overcome. This predicts a smaller ring in a more strongly barred galaxy, consistent with observations. Star formation rate (SFR) in a nuclear ring is determined primarily by the mass inflow rate to the ring. In our models, the SFR typically shows a short strong burst associated with the rapid gas infall and stays very small for the rest of the evolution. When the SFR is low, ages of young star clusters exhibit an azimuthal gradient along the ring since star formation takes place mostly near the contact points between the dust lanes and the nuclear ring. When the SFR is large, on the other hand, star formation is widely distributed throughout the whole length of the ring, with no apparent age gradient of star clusters. Since observed ring star formation appears long-lived with episodic bursts, our results suggest that the bar region should be replenished continually with fresh gas from outside.

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7

Pearce, F. R., and P. A. Thomas. "Ring formation in triaxial potentials." Monthly Notices of the Royal Astronomical Society 248, no. 4 (February 15, 1991): 688–700. http://dx.doi.org/10.1093/mnras/248.4.688.

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8

Sammes, Peter G., and David J. Weller. "Steric Promotion of Ring Formation." Synthesis 1995, no. 10 (October 1995): 1205–22. http://dx.doi.org/10.1055/s-1995-4099.

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9

Dutta, Aloke K., and Jared A. Butcher. "Macrocyclic ring formation in micelles." Tetrahedron Letters 27, no. 29 (January 1986): 3343–44. http://dx.doi.org/10.1016/s0040-4039(00)84791-7.

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10

Spiridonova, Sofya. "Formation dynamics in geostationary ring." Celestial Mechanics and Dynamical Astronomy 125, no. 4 (May 10, 2016): 485–500. http://dx.doi.org/10.1007/s10569-016-9693-0.

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11

Bournaud, F., and F. Combes. "Formation of polar ring galaxies." Astronomy & Astrophysics 401, no. 3 (April 2003): 817–33. http://dx.doi.org/10.1051/0004-6361:20030150.

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12

Bonanomi, G., G. Incerti, A. Stinca, F. Cartenì, F. Giannino, and S. Mazzoleni. "Ring formation in clonal plants." Community Ecology 15, no. 1 (June 2014): 77–86. http://dx.doi.org/10.1556/comec.15.2014.1.8.

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13

Henisch, H. K. "Liesegang ring formation in gels." Journal of Crystal Growth 76, no. 2 (August 1986): 279–89. http://dx.doi.org/10.1016/0022-0248(86)90372-6.

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14

Güth, Werner, and Bezalel Peleg. "On ring formation in auctions." Mathematical Social Sciences 32, no. 1 (August 1996): 1–37. http://dx.doi.org/10.1016/0165-4896(96)00808-6.

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15

Tang, Jay, Josef Käs, Jagesh Shah, and Paul Janmey. "Counterion-induced actin ring formation." European Biophysics Journal 30, no. 7 (December 1, 2001): 477–84. http://dx.doi.org/10.1007/s002490100178.

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16

Akhmetov, D. G. "Model of vortex ring formation." Journal of Applied Mechanics and Technical Physics 49, no. 6 (November 2008): 909–18. http://dx.doi.org/10.1007/s10808-008-0113-4.

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17

Wu, Yu-Ting, and Ing-Guey Jiang. "On the formation of ring galaxies." Proceedings of the International Astronomical Union 6, S271 (June 2010): 102–9. http://dx.doi.org/10.1017/s1743921311017509.

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AbstractThe formation scenario of ring galaxies is addressed in this paper. We focus on the P-type ring galaxies presented in Madore, Nelson & Petrillo (2009), particularly on the axis-symmetric ones. Our simulations show that a ring can form through the collision of disc and dwarf galaxies, and the locations, widths, and density contrasts of the ring are well determined. We find that a ring galaxy such as AM 2302-322 can be produced by this collision scenario.

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18

Sommer, Andrei P., and Noemi Rozlosnik. "Formation of Crystalline Ring Patterns on Extremely Hydrophobic Supersmooth Substrates: Extension of Ring Formation Paradigms." Crystal Growth & Design 5, no. 2 (March 2005): 551–57. http://dx.doi.org/10.1021/cg0496989.

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19

Wang, Kai, Chenghao Jiang, Zhenming Zhang, Chunyu Han, Xuewei Wang, Yaping Li, Kaiting Chen, and Junfeng Zhao. "Cut and sew: benzofuran-ring-opening enabled cyclopentenone ring formation." Chemical Communications 56, no. 84 (2020): 12817–20. http://dx.doi.org/10.1039/d0cc05271j.

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20

Mizuno, T., K. Yoshioka, Y. Sato, H. Yokoi, M. Takita, and S. Nagano. "Multicellular Ring Formation in Dictyostelium discoieum." Seibutsu Butsuri 39, supplement (1999): S40. http://dx.doi.org/10.2142/biophys.39.s40_1.

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21

Hubber, D. A., and A. P. Whitworth. "Binary star formation from ring fragmentation." Astronomy & Astrophysics 437, no. 1 (June 10, 2005): 113–25. http://dx.doi.org/10.1051/0004-6361:20042428.

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22

Rolando, Richard J., and Christopher W. Macosko. "Ring formation in linear stepwise polymerization." Macromolecules 20, no. 11 (November 1987): 2707–13. http://dx.doi.org/10.1021/ma00177a013.

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23

Delcourt, D. C., J. A. Sauvaud, and T. E. Moore. "Cleft contribution to ring current formation." Journal of Geophysical Research 95, A12 (1990): 20937. http://dx.doi.org/10.1029/ja095ia12p20937.

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24

Araujo, N. C. S., E. Vieira Neto, and D. W. Foryta. "Formation of the G-ring arc." Monthly Notices of the Royal Astronomical Society 461, no. 2 (May 5, 2016): 1868–74. http://dx.doi.org/10.1093/mnras/stw1055.

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25

MOHSENI, KAMRAN, HONGYU RAN, and TIM COLONIUS. "Numerical experiments on vortex ring formation." Journal of Fluid Mechanics 430 (March 10, 2001): 267–82. http://dx.doi.org/10.1017/s0022112000003025.

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26

Caglayan, Humeyra, Irfan Bulu, Marko Loncar, and Ekmel Ozbay. "Cavity formation in split ring resonators." Photonics and Nanostructures - Fundamentals and Applications 6, no. 3-4 (December 2008): 200–204. http://dx.doi.org/10.1016/j.photonics.2008.09.001.

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27

Pisaroni, M., R. Sadi, and D. Lahaye. "Counteracting ring formation in rotary kilns." Journal of Mathematics in Industry 2, no. 1 (2012): 3. http://dx.doi.org/10.1186/2190-5983-2-3.

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28

Chatterjee, Tapan K. "The formation of faint ring structures." Astrophysics and Space Science 121, no. 2 (1986): 213–24. http://dx.doi.org/10.1007/bf00653694.

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29

Addinall, S. G., E. Bi, and J. Lutkenhaus. "FtsZ ring formation in fts mutants." Journal of bacteriology 178, no. 13 (1996): 3877–84. http://dx.doi.org/10.1128/jb.178.13.3877-3884.1996.

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30

Kaur, Harsimran, Suresh Kumar, Kashmir Singh, and Lalit M. Bharadwaj. "Divalent cation induced actin ring formation." International Journal of Biological Macromolecules 48, no. 5 (June 2011): 793–97. http://dx.doi.org/10.1016/j.ijbiomac.2011.03.004.

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31

Spouge, John L. "Equilibrium ring formation in polymer solutions." Journal of Statistical Physics 43, no. 1-2 (April 1986): 143–96. http://dx.doi.org/10.1007/bf01010576.

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32

Berta, René, and Ladislav Lukáč. "Ash ring formation in lime rotary kilns." Advances in Thermal Processes and Energy Transformation 1, no. 1 (2018): 01–04. http://dx.doi.org/10.54570/atpet2018/01/01/0001.

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This paper describes in different sections all know factors influencing ash ring formation in lime rotary kilns. Ash ring is mostly influence by fuel and lime properties and its impurities and process conditions. The paper describes different types of ash rings that might formed in rotary kilns. Factors were analyzed from feed batch, fuel to construction parts of rotary kilns. Papers describes all know factors how to prevent ash ring formation and how decrease ash ring formation and its influence on operational conditions of lime rotary kilns.

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33

Li, Zhi‐Yun. "Ring Formation in Magnetically Subcritical Clouds and Multiple‐Star Formation." Astrophysical Journal 556, no. 2 (August 2001): 813–22. http://dx.doi.org/10.1086/321593.

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34

Chassignet, Eric P., and Douglas B. Boudra. "Dynamics of Agulhas Retroflection and Ring Formation in a Numerical Model. Part II. Energetics and Ring Formation." Journal of Physical Oceanography 18, no. 2 (February 1988): 304–19. http://dx.doi.org/10.1175/1520-0485(1988)018<0304:doarar>2.0.co;2.

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35

Tebbs, Irene R., and Thomas D. Pollard. "Separate roles of IQGAP Rng2p in forming and constricting the Schizosaccharomyces pombe cytokinetic contractile ring." Molecular Biology of the Cell 24, no. 12 (June 15, 2013): 1904–17. http://dx.doi.org/10.1091/mbc.e12-10-0775.

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Eukaryotic cells require IQGAP family multidomain adapter proteins for cytokinesis, but many questions remain about how IQGAPs contribute to the process. Here we show that fission yeast IQGAP Rng2p is required for both the normal process of contractile ring formation from precursor nodes and an alternative mechanism by which rings form from strands of actin filaments. Our work adds to previous studies suggesting a role for Rng2p in node and ring formation. We demonstrate that Rng2p is also required for normal ring constriction and septum formation. Systematic analysis of domain-deletion mutants established how the four domains of Rng2p contribute to cytokinesis. Contrary to a previous report, the actin-binding calponin homology domain of Rng2p is not required for viability, ring formation, or ring constriction. The IQ motifs are not required for ring formation but are important for ring constriction and septum formation. The GTPase-activating protein (GAP)–related domain is required for node-based ring formation. The Rng2p C-terminal domain is the only domain essential for viability. Our studies identified several distinct functions of Rng2 at multiple stages of cytokinesis.

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36

Proshina, I., O. Sil’chenko, and A. Moiseev. "Star formation in outer rings of S0 galaxies." Astronomy & Astrophysics 634 (February 2020): A102. http://dx.doi.org/10.1051/0004-6361/201936912.

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Aims. Although S0 galaxies are often thought to be “red and dead”, they frequently demonstrate star formation organised in ring structures. We try to clarify the nature of this phenomenon and its difference from star formation in spiral galaxies. Here we study the moderate-luminosity nearby S0 galaxy, NGC 4513. Methods. By applying long-slit spectroscopy along the major axis of NGC 4513, we measured gas and star kinematics, Lick indices for the main body of the galaxy, and strong emission-line flux ratios in the ring. After inspecting the gas excitation in the ring using the line ratios diagnostic diagrams and showing that it is ionised by young stars, we determined the gas oxygen abundance using popular strong-line calibration methods. We estimated the star formation rate (SFR) in the outer ring using the archival Galaxy Evolution Explorer (GALEX) ultraviolet images of the galaxy. Results. The ionised gas counter-rotates the stars over the whole extension of NGC 4513 suggesting that it is being accreted from outside. The gas metallicity in the ring is slightly subsolar, [O/H] = −0.2 dex, matching the metallicity of the stellar component of the main galactic disc. However the stellar component of the ring is much more massive than can be explained by the current star formation level in the ring. We conclude that the ring of NGC 4513 is probably the result of tidal disruption of a massive gas-rich satellite, or may be the consequence of a long star-formation event provoked by gas accretion from a cosmological filament that started some 3 Gyr ago.

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37

Sun, Junling, Marco Frasconi, Zhichang Liu, Jonathan C. Barnes, Yuping Wang, Dongyang Chen, Charlotte L. Stern, and J. Fraser Stoddart. "Formation of ring-in-ring complexes between crown ethers and rigid TVBox8+." Chemical Communications 51, no. 8 (2015): 1432–35. http://dx.doi.org/10.1039/c4cc08053j.

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An octacationic tetraviologen-based cyclophane—so called TVBox⁸⁺—can form a ring-in-ring complex with bis-1,5-dinaphtho[50]crown-14, which represents a key intermediate for constructing molecular Borromean rings in a stepwise manner.

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38

Marston, A. P., and P. N. Appleton. "Multiwavelength observations of ring galaxies. 2: Global star formation in ring galaxies." Astronomical Journal 109 (March 1995): 1002. http://dx.doi.org/10.1086/117337.

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39

Vorobyov, E. I. "Large-scale ring waves of star formation in the cartwheel ring galaxy." Astronomical & Astrophysical Transactions 22, no. 1 (February 2003): 95–102. http://dx.doi.org/10.1080/1055679021000017376.

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40

Jung, Michael E., and Rodolfo Marquez. "Gem-disubstituent effects in small ring formation: Novel ketal ring size effect." Tetrahedron Letters 38, no. 37 (September 1997): 6521–24. http://dx.doi.org/10.1016/s0040-4039(97)01519-0.

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41

Di Martino, Alessandro, Carlo Galli, Patrizia Gargano, and Luigi Mandolini. "Ring-closure reactions. Part 23. Kinetics of formation of three- to seven-membered-ring N-tosylazacycloalkanes. The role of ring strain in small- and common-sized-ring formation." Journal of the Chemical Society, Perkin Transactions 2, no. 9 (1985): 1345. http://dx.doi.org/10.1039/p29850001345.

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42

Uchida, Kazuhiro, Kazuhiko Higashi, Koichi Hishida, Atsushi Hotta, and Norihisa Miki. "Electrospray formation of ring-shaped silica nanoparticles." Japanese Journal of Applied Physics 54, no. 2 (January 23, 2015): 020302. http://dx.doi.org/10.7567/jjap.54.020302.

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43

Murata, Shizuaki, Takashi Sugimoto, and Sadao Matsuura. "A Novel Ring Formation of 1,2-Dihydroquinoxalines." HETEROCYCLES 26, no. 4 (1987): 883. http://dx.doi.org/10.3987/r-1987-04-0883.

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44

Tarhan, Okan, Cihangir Tanyeli, Ayhan S. Demir, �demir �arslan, and Idris Mecidoglu. "Acid Catalyzed a-Pyrone Ring Formation Reactions." HETEROCYCLES 37, no. 3 (1994): 1705. http://dx.doi.org/10.3987/com-93-s140.

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45

Fleischhacker, Wilhelm, Bernd Richter, Gerald Giester, and Thomas H. Brehmer. "An unexpected ring formation in morphine chemistry." Arkivoc 2001, no. 2 (November 6, 2001): 82–94. http://dx.doi.org/10.3998/ark.5550190.0002.210.

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46

Goshima, J., H. Kato, and S. Ishiwata. "Ring Formation of Actin Filament in vitro." Seibutsu Butsuri 39, supplement (1999): S195. http://dx.doi.org/10.2142/biophys.39.s195_2.

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47

Kim, Ki-Jeong, Se-Na Yang, Young-Chan Park, Han-Koo Lee, Bong-Soo Kim, and Han-Gil Lee. "Ring Formation of Furan on Epitaxial Graphene." Journal of the Korean Vacuum Society 20, no. 4 (July 30, 2011): 252–57. http://dx.doi.org/10.5757/jkvs.2011.20.4.252.

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48

Bauer, Wolfgang, George F. Bertsch, and Hartmut Schulz. "Bubble and ring formation in nuclear fragmentation." Physical Review Letters 69, no. 13 (September 28, 1992): 1888–91. http://dx.doi.org/10.1103/physrevlett.69.1888.

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49

Perrone, Theresa. "Signet-ring cell formation in cutaneous neoplasms." Journal of the American Academy of Dermatology 44, no. 3 (March 2001): 549–50. http://dx.doi.org/10.1067/mjd.2001.111350.

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50

Hsu, J. Y., C. S. Liu, R. Prater, and S. H. Lin. "Hot-electron ring formation in tokamak plasmas." Physics of Fluids 29, no. 2 (1986): 507. http://dx.doi.org/10.1063/1.865437.

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