نتایج جستجو برای: chirality

تعداد نتایج: 12872  

2015
Igor Dolamic Birte Varnholt Thomas Bürgi

The transfer of chirality from one set of molecules to another is fundamental for applications in chiral technology and has likely played a crucial role for establishing homochirality on earth. Here we show that an intrinsically chiral gold cluster can transfer its handedness to an achiral molecule adsorbed on its surface. Solutions of chiral Au38(2-PET)24 (2-PET=2-phenylethylthiolate) cluster ...

Journal: :Entropy 2012
Davor Palle

The presence of dark energy in the Universe challenges the Einstein’s theory 1 of gravity at cosmic scales. It motivates the inclusion of rotational degrees of freedom in 2 the Einstein-Cartan gravity, representing the minimal and the most natural extension of the 3 General Relativity. One can, consequently, expect the violation of the cosmic isotropy by 4 the rotating Universe. We study chiral...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2002
J D Noh H Rieger M Enderle K Knorr

We study the antiferromagnetic six-state clock model with nearest neighbor interactions on a triangular lattice with extensive Monte Carlo simulations. We find clear indications of two phase transitions at two different temperatures: Below T(I) a chirality order sets in and by a thorough finite-size-scaling analysis of the specific heat and the chirality correlation length we show that this tra...

Journal: :Science 2002
Bartosz A Grzybowski George M Whitesides

An object spinning at the surface of a liquid creates a chiral vortex. If the spinning object is itself chiral, its shape modifies the characteristics of the vortex; interactions between that vortex and other vortices then depend on the chirality of the objects that produce them. This paper describes the aggregation of millimeter-sized, chiral magnetized plates floating at a liquid-air interfac...

2015
Depeng Zhao Thomas M. Neubauer Ben L. Feringa

Chirality plays a fundamental role in biology and chemistry and the precise control of chirality in a catalytic conversion is a key to modern synthesis most prominently seen in the production of pharmaceuticals. In enantioselective metal-based catalysis, access to each product enantiomer is commonly achieved through ligand design with chiral bisphosphines being widely applied as privileged liga...

2016
Ward Brullot Maarten K Vanbel Tom Swusten Thierry Verbiest

Circular dichroism and optical rotation are crucial for the characterization of chiral molecules and are of importance to the study of pharmaceutical drugs, proteins, DNA, and many others. These techniques are based on the different interactions of enantiomers with circularly polarized components of plane wave light that carries spin angular momentum (SAM). For light carrying orbital angular mo...

Journal: :Nature chemistry 2015
Jos C M Kistemaker Peter Štacko Johan Visser Ben L Feringa

Control of the direction of motion is an essential feature of biological rotary motors and results from the intrinsic chirality of the amino acids from which the motors are made. In synthetic autonomous light-driven rotary motors, point chirality is transferred to helical chirality, and this governs their unidirectional rotation. However, achieving directional rotary motion in an achiral molecu...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2011
Yoshiki Sawa Fangfu Ye Kenji Urayama Toshikazu Takigawa Vianney Gimenez-Pinto Robin L B Selinger Jonathan V Selinger

How microscopic chirality is reflected in macroscopic scale to form various chiral shapes, such as straight helicoids and spiral ribbons, and how the degree of macroscopic chirality can be controlled are a focus of studies on the shape formation of many biomaterials and supramolecular systems. This article investigates both experimentally and theoretically how the chiral arrangement of liquid c...

Journal: :Biophysical journal 2012
Xuejin Li Bruce Caswell George Em Karniadakis

We present simulation results on the self-assembly behavior of sickle hemoglobin (HbS). A coarse-grained HbS model, which contains hydrophilic and hydrophobic particles explicitly, is constructed to match the structural properties and physical description of HbS. The hydrophobic interactions are shown to be necessary with chirality being the main driver for the formation of HbS fibers. In the a...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2006
A Jákli G Liao I Shashikala U S Hiremath C V Yelamaggad

Liquid-crystal phases with both solid and liquid characteristics are unique, since they exhibit chirality on both molecular and mesoscopic levels under special circumstances. We have studied binary composites formed by mixing of a chiral dimer (B-Ch), in which a bent core is covalently linked to a promesogenic cholesterol unit through a flexible spacer, and an achiral bent-core mesogen having t...

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