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Journal articles on the topic 'Ring formation'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Pellissier, Hélène. "The Use of Domino Reactions for the Synthesis of Chiral Rings." Synthesis 52, no. 24 (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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2

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

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3

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 infr

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4

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 infr

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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

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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 (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

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7

Wu, Yu-Ting, and Ing-Guey Jiang. "On the formation of ring galaxies." Proceedings of the International Astronomical Union 6, S271 (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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8

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

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9

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

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10

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

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11

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

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12

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

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13

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

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14

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

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15

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

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16

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

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17

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

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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 (2005): 551–57. http://dx.doi.org/10.1021/cg0496989.

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19

Wang, Kai, Chenghao Jiang, Zhenming Zhang, et al. "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

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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21

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 (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 mutant

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22

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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23

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

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24

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

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25

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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26

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 (2016): 1868–74. http://dx.doi.org/10.1093/mnras/stw1055.

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27

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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28

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 (2008): 200–204. http://dx.doi.org/10.1016/j.photonics.2008.09.001.

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29

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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30

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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31

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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32

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

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33

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

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34

Woo, J. M. Y., A. Morbidelli, S. L. Grimm, J. Stadel, and R. Brasser. "Terrestrial planet formation from a ring." Icarus 396 (May 2023): 115497. http://dx.doi.org/10.1016/j.icarus.2023.115497.

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35

Takahashi, Sanemichi Z., Eiichiro Kokubo, and Shu-ichiro Inutsuka. "Planetesimal Formation by the Gravitational Instability of Dust Ring Structures." Astrophysical Journal 945, no. 2 (2023): 120. http://dx.doi.org/10.3847/1538-4357/ac9fd0.

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Abstract We investigate the gravitational instability (GI) of dust ring structures and the formation of planetesimals by their gravitational collapse. The normalized dispersion relation of a self-gravitating ring structure includes two parameters that are related to its width and line mass (the mass per unit length). We survey these parameters and calculate the growth rate and wavenumber. Additionally, we investigate the formation of planetesimals by growth of the GI of the ring that is formed by the growth of the secular GI of the protoplanetary disk. We adopt a massive, dust-rich disk as a d

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36

Yokoshima, Satoshi. "Synthesis of Polycyclic Natural Products through Skeletal Rearrangement." Synlett 31, no. 20 (2020): 1967–75. http://dx.doi.org/10.1055/s-0040-1707904.

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Construction of rings through reliable reactions followed by changes in the ring size or the connectivity through skeletal rearrangement provides molecules with a wide range of skeletons. In this account, our syntheses of polycyclic natural products through skeletal rearrangement are discussed.1 Introduction2 Synthesis through Changes in the Ring Size3 Synthesis by Biomimetic Strategies4 Synthesis through Metathesis5 Synthesis through Temporary Formation of a Ring6 Conclusion

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37

Gorog, J. Peter, and W. Ray Leary. "Ring removal in rotary kilns used by the pulp and paper industry." March 2016 15, no. 3 (2016): 205–13. http://dx.doi.org/10.32964/tj15.3.205.

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Ring formation occurs in the rotary kilns used by the pulp and paper industry to regenerate the lime needed to produce white liquor. The main rings are: burning zone rings, mid-kiln rings, dust rings and/or mud balls, and mud rings. While the exact mechanisms of ring formation are not completely understood, frequent changes in the production rate and the mud solids, high soda content in the mud, and high levels of dust are believed to play a major role in ring formation. The presence of rings can restrict the movement of material through the kiln. If undetected, this can result in overheating

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38

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 diagno

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39

Aijaz, Rashid, and Ahad Shazia. "FtsZ, A Tubulin Homologue Spatiotemporally Regulates the Bacterial Cell Division." International Journal of Trend in Scientific Research and Development 1, no. 5 (2017): 1273–80. https://doi.org/10.31142/ijtsrd2410.

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Most common pattern of Bacterial division is binary fission. Bacterial division occurs by the construction of Z ring at appropriate time and at a defined site. FtsZ is the major component of Z ring formation, and the polymerization of FtsZ is regulated in space and time by negative and positive regulators of FtsZ assembly. In the bacterial cell positive and negative regulators help in attaining a critical concentration gradient, such that at mid cell the critical concentration required for Z ring formation is lowest, thus Z ring formation takes place at this site only. Aijaz Rashid | Shazia Ah

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40

Chen, Hsin, Audrey S. Howell, Alex Robeson, and Daniel J. Lew. "Dynamics of septin ring and collar formation in Saccharomyces cerevisiae." Biological Chemistry 392, no. 8-9 (2011): 689–97. http://dx.doi.org/10.1515/bc.2011.075.

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Abstract Although the septin ring and collar in budding yeast were described over 20 years ago, there is still controversy regarding the organization of septin filaments within these structures and about the way in which the ring first forms and about how it converts into a collar at the mother-bud neck. Here we present quantitative analyses of the recruitment of fluorescently-tagged septins to the ring and collar through the cell cycle. Septin ring assembly began several minutes after polarity establishment and this interval was longer in daughter than in mother cells, suggesting asymmetric i

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41

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

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42

Morbidelli, A. "Planet formation by pebble accretion in ringed disks." Astronomy & Astrophysics 638 (May 29, 2020): A1. http://dx.doi.org/10.1051/0004-6361/202037983.

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Context. Pebble accretion is expected to be the dominant process for the formation of massive solid planets, such as the cores of giant planets and super-Earths. So far, this process has been studied under the assumption that dust coagulates and drifts throughout the full protoplanetary disk. However, observations show that many disks are structured in rings that may be due to pressure maxima, preventing the global radial drift of the dust. Aims. We aim to study how the pebble-accretion paradigm changes if the dust is confined in a ring. Methods. Our approach is mostly analytic. We derived a f

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43

Daisaka, Hiroshi. "N-body Simulations of Planetary Rings." Symposium - International Astronomical Union 208 (2003): 387–88. http://dx.doi.org/10.1017/s0074180900207390.

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We present the formation and evolution of a structure in particles obtained from a local N-body simulation of a dense planetary ring like Saturn's ring. Our simulations show in a particle system the spontaneous formation of a spatial structure like wakes, clumps, and a structure which could be induced by the viscous overstability. Such a formation depends on parameters characterizing a ring system: the wake is likely to form in Saturn's ring and the existence of the wake is consistent with observations. The viscous overstability would be a good candidate for the explanation of subring structur

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44

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 (1988): 304–19. http://dx.doi.org/10.1175/1520-0485(1988)018<0304:doarar>2.0.co;2.

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45

Girvin, Zebediah C., Mary Katherine Andrews, Xinyu Liu, and Samuel H. Gellman. "Foldamer-templated catalysis of macrocycle formation." Science 366, no. 6472 (2019): 1528–31. http://dx.doi.org/10.1126/science.aax7344.

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Macrocycles, compounds containing a ring of 12 or more atoms, find use in human medicine, fragrances, and biological ion sensing. The efficient preparation of macrocycles is a fundamental challenge in synthetic organic chemistry because the high entropic cost of large-ring closure allows undesired intermolecular reactions to compete. Here, we present a bioinspired strategy for macrocycle formation through carbon–carbon bond formation. The process relies on a catalytic oligomer containing α- and β-amino acid residues to template the ring-closing process. The α/β-peptide foldamer adopts a helica

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46

SAU, RAJES, and KRISHNAN MAHESH. "Passive scalar mixing in vortex rings." Journal of Fluid Mechanics 582 (June 14, 2007): 449–61. http://dx.doi.org/10.1017/s0022112007006349.

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Direct numerical simulation is used to study the mixing of a passive scalar by a vortex ring issuing from a nozzle into stationary fluid. The ‘formation number’ (Gharibet al. J. Fluid Mech.vol. 360, 1998, p. 121), is found to be 3.6. Simulations are performed for a range of stroke ratios (ratio of stroke length to nozzle exit diameter) encompassing the formation number, and the effect of stroke ratio on entrainment and mixing is examined. When the stroke ratio is greater than the formation number, the resulting vortex ring with trailing column of fluid is shown to be less effective at mixing a

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47

Kamijo, Keiju, Naoya Ohara, Mitsuhiro Abe, et al. "Dissecting the Role of Rho-mediated Signaling in Contractile Ring Formation." Molecular Biology of the Cell 17, no. 1 (2006): 43–55. http://dx.doi.org/10.1091/mbc.e05-06-0569.

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In anaphase, microtubules provide a specification signal for positioning of the contractile ring. However, the nature of the signal remains unknown. The small GTPase Rho is a potent regulator of cytokinesis, but the involvement of Rho in contractile ring formation is disputed. Here, we show that Rho serves as a microtubule-dependent signal that specifies the position of the contractile ring. We found that Rho translocates to the equatorial region before furrow ingression. The Rho-specific inhibitor C3 exoenzyme and small interfering RNA to the Rho GDP/GTP exchange factor ECT2 prevent this tran

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48

Hess, B. Andes. "On the Concerted Ring Opening of Protonated Squalene Oxide and A-Ring Formation in the Biosynthesis of Lanosterol." Collection of Czechoslovak Chemical Communications 68, no. 1 (2003): 202–10. http://dx.doi.org/10.1135/cccc20030202.

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Density functional calculations were performed on a model system of squalene oxide to study the mechanism of the formation of ring A in the biosynthesis of lanosterol from squalene. When (2Z)-6,7-epoxy-3,7-dimethyloct-2-ene was protonated, it was calculated to undergo a very facile ring opening of the oxirane in concert with the formation of the six-membered ring of the 4-(hydroxymethyl)-1,2,3,3-tetramethy1cyclohexyl cation. A study of the reaction pathway (IRC) indicates a very early transition structure in which the carbon- carbon double bond participates anchimerically in the ring-opening o

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49

El-amine, Nour, Sabrya C. Carim, Denise Wernike, and Gilles R. X. Hickson. "Rho-dependent control of the Citron kinase, Sticky, drives midbody ring maturation." Molecular Biology of the Cell 30, no. 17 (2019): 2185–204. http://dx.doi.org/10.1091/mbc.e19-04-0194.

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Rho-dependent proteins control assembly of the cytokinetic contractile ring, yet it remains unclear how those proteins guide ring closure and how they promote subsequent formation of a stable midbody ring. Citron kinase is one important component required for midbody ring formation but its mechanisms of action and relationship with Rho are controversial. Here, we conduct a structure–function analysis of the Drosophila Citron kinase, Sticky, in Schneider’s S2 cells. We define two separable and redundant RhoGEF/Pebble-dependent inputs into Sticky recruitment to the nascent midbody ring and show

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50

Arai, Ritsuko, and Issei Mabuchi. "F-actin ring formation and the role of F-actin cables in the fission yeastSchizosaccharomyces pombe." Journal of Cell Science 115, no. 5 (2002): 887–98. http://dx.doi.org/10.1242/jcs.115.5.887.

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Cells of the fission yeast Schizosaccharomyces pombe divide by the contraction of the F-actin ring formed at the medial region of the cell. We investigated the process of F-actin ring formation in detail using optical sectioning and three-dimensional reconstruction fluorescence microscopy. In wild-type cells, formation of an aster-like structure composed of F-actin cables and accumulation of F-actin cables were recognized at the medial cortex of the cell during prophase to metaphase. The formation of the aster-like structure seemed to initiate from branching of the longitudinal F-actin cables

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