Results 41 to 50 of about 797,239 (340)

DNA cyclization and looping in the wormlike limit: normal modes and the validity of the harmonic approximation [PDF]

, 2015
For much of the last three decades Monte Carlo-simulation methods have been the standard approach for accurately calculating the cyclization probability, $J$, or J factor, for DNA models having sequence-dependent bends or inhomogeneous bending ...
Alexandrowicz, Brackley, Chaumeil, Crothers, Flory, Flory, Gennes, Giovan, Guo, Hagerman, Hagerman, Hensel, Hill, Hockings, Hou, Kahn, Kahn, Koo, Kulaeva, Levene, Levene, Levene, Levene, Marini, May, Nathan, Olson, Olson, Polikanov, Reichl, Roychoudhury, Sanyal, Shimada, Shimada, Shore, Shore, Shore, Swigon, Tokuda, Wu, Zhang, Zhang, Zhang, Zhang   +43 more
core   +3 more sources

The unpredictably eruptive dynamics of spruce budworm populations in eastern Canada

Population Ecology, EarlyView.
We examine historical population data for spruce budworm from several locations through the period 1930–1997, and use density‐dependent recruitment curves to test whether the pattern of population growth over time is more consistent with Royama's (1984; Ecological Monographs 54:429–462) linear R(t) model of harmonic oscillation at Green River New ...
Barry J. Cooke, Jacques Régnière
wiley   +1 more source

Hypervalent iodine-mediated cyclization of bishomoallylamides to prolinols

Beilstein Journal of Organic Chemistry
A change in mechanism was observed in the hypervalent iodine-mediated cyclization of N-alkenylamides when the carbon chain between the alkene and the amide increased from two to three atoms.
Smaher E. Butt, Konrad Kepski, Jean-Marc Sotiropoulos, Wesley J. Moran   +3 more
doaj   +1 more source

Oxidative radical ring-opening/cyclization of cyclopropane derivatives

Beilstein Journal of Organic Chemistry, 2019
The ring-opening/cyclization of cyclopropane derivatives has drawn great attention in the past several decades. In this review, recent efforts in the development of oxidative radical ring-opening/cyclization of cyclopropane derivatives, including ...
Yu Liu, Qiao-Lin Wang, Zan Chen, Cong-Shan Zhou, Bi-Quan Xiong, Pan-Liang Zhang, Chang-An Yang, Quan Zhou   +7 more
doaj   +1 more source

Synthesis of New Potentially Bioactive Bicyclic 2-Pyridones

Molecules, 2005
Three convenient methods of reduction of the nitro group of 5-nitroimidazoles and 5-nitrothiazole that bear a diethylmethylene malonate group in an ortho-like position with respect to the nitro group and cyclization of the resulting amino derivatives are
Patrice Vanelle, Michel P. Crozet, Pascal George, Maxime D. Crozet   +3 more
doaj   +1 more source

Domino alkylation-cyclization reaction of propargyl bromides with thioureas/thiopyrimidinones: A new facile synthesis of 2-aminothiazoles and 5H-thiazolo[3,2-a]pyrimidin-5-ones [PDF]

, 2009
A new synthesis of 2-aminothiazoles and 5H-thiazolo[3,2-a]pyrimidin-5-ones was developed as a domino alkylation-cyclization reaction of propargyl bromides with thioureas and thio¬pyrimidinones, respectively.
Bernardini, Martina, Botta, Maurizio, Castagnolo, Daniele, Pagano, Mafalda   +3 more
core   +1 more source

Network topology drives population temporal variability in experimental habitat networks

Population Ecology, EarlyView.
Habitat patches connected by dispersal pathways form habitat networks. We explored how network topology affects population outcomes in laboratory experiments using a model species (Daphnia carinata). Central habitat nodes in complex lattice networks exhibited lower temporal variability in population sizes, suggesting they support more stable ...
Yiwen Xu, J. Angus Webb, William D. Bovill, Elise L. King   +3 more
wiley   +1 more source

Synthesis of a Molecular Charm Bracelet via Click Cyclization and Olefin Metathesis Clipping [PDF]

, 2010
We describe the synthesis of a polycatenated cyclic polymer, a structure that resembles a molecular charm bracelet. Ruthenium-catalyzed ring-opening metathesis polymerization of an aminocontaining cyclic olefin monomer in the presence of a chain ...
Chan, Wing Yan, Clark, Paul G., Grubbs, Robert H., Guidry, Erin N., Steinmetz, Wayne E.   +4 more
core   +2 more sources

Cyclization of Polyenes. III Cyclization of Squalene-oxides

Chemical and Pharmaceutical Bulletin, 1968
For the purpose of finding the optimum conditions of biogenetic-type synthesis of onocerin from squalene 2, 3; 22, 23-dioxide (IV), acid-catalyzed cyclization (BF3-etherate in water-saturated benzene) of squalene-2, 3-oxide (I) was investigated to afford the compounds, III, V, VI, VII, VIII and IX. The gross structure of these compounds was established
Morio Kishi, Yoshio Kitahara, Tadahiro Kato   +2 more
openaire   +3 more sources

Acid-Catalyzed Cyclization of Epoxyallylsilanes. An Unusual Rearrangement Cyclization Process [PDF]

Organic Letters, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Francisco J. Pulido, Asunción Barbero, Pilar Castreno   +2 more
openaire   +4 more sources