Molecular Power Spring: Circular Dichroism Inversion of Polythiophene Aggregates from the Right-Handed Helix to Left-Handed Helix

2019 ◽  
Vol 123 (13) ◽  
pp. 2925-2929 ◽  
Author(s):  
Shingo Hattori ◽  
Stefaan Vandendriessche ◽  
Toshiyuki Hirano ◽  
Fumitoshi Sato ◽  
Guy Koeckelberghs ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Left Handed ◽  
The Right ◽  
Circular Dichroïsm

Scanning microcalorimetry and circular dichroism study of melting of the natural polypeptides in the left-handed helical conformation

1993 ◽  
Vol 12 (1) ◽  
pp. 85-91 ◽  
Author(s):  
Alexander A. Makarov ◽  
Ivan A. Adzhubei ◽  
Irina I. Protasevich ◽  
Vladimir M. Lobachov ◽  
Natalia G. Esipova
Keyword(s):  
Circular Dichroism ◽  
Helical Conformation ◽  
Left Handed ◽  
Circular Dichroïsm

Gyrotropic left-handed media: Energy flux and circular dichroism

2006 ◽  
Vol 300 (1) ◽  
pp. e67-e69 ◽  
Author(s):  
A.V. Ivanov ◽  
O.A. Kotelnikova ◽  
V.A. Ivanov
Keyword(s):  
Circular Dichroism ◽  
Energy Flux ◽  
Left Handed ◽  
Circular Dichroïsm

scholarly journals Vacuum UV circular dichroism is diagnostic for the left-handed Z form of poly (d(A-C-d).d(G-D) and other potydeoxynudeotides

1987 ◽  
Vol 15 (18) ◽  
pp. 7627-7636 ◽  
Author(s):  
Jeannine H. Riazance ◽  
W.Curtis Johnson ◽  
Lawrence P. McImosh ◽  
Thomas M. Jovin
Keyword(s):  
Circular Dichroism ◽  
Left Handed ◽  
Circular Dichroïsm ◽  
Vacuum Uv

Protamines. VII. Circular Dichroism Study of Salmine A I

1981 ◽  
Vol 36 (3-4) ◽  
pp. 305-309 ◽  
Author(s):  
G. M. Bonora ◽  
F. Bertanzon ◽  
V. Moretto ◽  
C. Toniolo
Keyword(s):  
Aqueous Solution ◽  
Circular Dichroism ◽  
Statistical Methods ◽  
Basic Protein ◽  
Helical Conformation ◽  
Counter Ions ◽  
Conformational Preferences ◽  
Main Components ◽  
The Right ◽  
Circular Dichroïsm

Salmine A I, one of the components of the protamine from salmon, has been purified and characterized. The conformational preferences of salmine A I have been examined as a function of pH, added salts, presence of helix-supporting solvents, and temperature, using circular dichroism. It has been found that this small basic protein adopts predominantly an unordered conformation in aqueous solution. Addition of counter-ions, in particular perchlorate, and 2-chloroethanol induces to various extents the onset of the right-handed α-helical conformation. The results are discussed in comparison with those previously reported on the three main components of clupeine, the protamine from herring, and with the published conformational predictions by various statistical methods

Optically active multi-helical erythrocyte-like Ln(OH)CO3 (Ln = La, Ce, Pr and Sm)

2016 ◽  
Vol 18 (30) ◽  
pp. 20261-20265 ◽  
Author(s):  
Jing Chen ◽  
Songmei Li ◽  
Juan Du ◽  
Bo Wang ◽  
Shiming Meng ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Conduction Band ◽  
Optically Active ◽  
Induced Circular Dichroism ◽  
Coupling Effects ◽  
Chiral Structure ◽  
Left Handed ◽  
Circular Dichroïsm

Hierarchical erythrocyte-like Ln(OH)CO3 with nanosized chiral structure-induced circular dichroism responses, assigned to valence to conduction band transitions and coupling effects between the left-handed-assembled Ln(OH)CO3 nanorods in the multi-helical RBC-like architecture.

Helicity-dependent resonant X-ray scattering in CuB2O4

2021 ◽  
Vol 28 (5) ◽  
Author(s):  
E. N. Ovchinnikova ◽  
A. Rogalev ◽  
F. Wilhelm ◽  
F. de Bergevin ◽  
V. E. Dmitrienko ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Scattering Process ◽  
X Ray ◽  
Polarized Beams ◽  
X Ray Scattering ◽  
New Information ◽  
Wyckoff Position ◽  
The Right ◽  
Resonant Transitions ◽  
Circular Dichroïsm

Exploitation of X-ray circular polarized beams to study forbidden Bragg reflections and new information that could be obtained in these experiments are discussed. It is shown that the intensities of such reflections can be different for the right- and left-circular polarizations (i.e. exhibiting circular dichroism) even for the dipole–dipole resonant transitions involved in the scattering process. This difference can be observed only in crystals having no center of inversion. Here, this approach is used to study helicity-dependent resonant diffraction in copper metaborate CuB2O4 single crystal, which is non-centrosymmetric but achiral. Nonetheless, a strong circular dichroism has been observed for hh0 forbidden reflections in the vicinity of the Cu K-edge. This effect is shown to originate from dipolar transitions in Cu atoms occupying the 8(d) Wyckoff position only.

The Left-Handed Z-DNA Conformation in Oligodeoxynucleotides Containing Different Amounts of AT Base Pairs: A Far UV Circular Dichroism Study

1989 ◽  
Vol 6 (6) ◽  
pp. 1217-1231 ◽  
Author(s):  
Luigi Emilio Xodo ◽  
Giorgio Manzini ◽  
Franco Quadrifoglio ◽  
Narayanarao Yathindra ◽  
Gijs A. van der Marel ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Dna Conformation ◽  
Base Pairs ◽  
Left Handed ◽  
Z Dna ◽  
Circular Dichroïsm

Hg(II)-Induced Changes in DNA-Circular Dichroism: Reversible Transitions between Right-Handed and Left-Handed Screwness

1989 ◽  
Vol 44 (11-12) ◽  
pp. 1015-1019 ◽  
Author(s):  
Dieter W. Gruenwedel
Keyword(s):  
Circular Dichroism ◽  
Double Helix ◽  
Spectral Characteristics ◽  
Base Pairs ◽  
Left Handed ◽  
Dna Base ◽  
Cacodylic Acid ◽  
Reversible Transitions ◽  
Induced Changes ◽  
Circular Dichroïsm

Exposing native calf thymus DNA (in 0.1 м NaClO4-, 5 mм cacodylic acid buffer, pH 6.81, 25 °C) to increasing concentrations of Hg(C 104)2 produces dramatic changes in its circular dichroism (C D ). Let r = [mol of added Hg(II)*/[mol DNA base]: the conservative CD spectrum of the DNA B-form, consisting of the 273 nm major ( + ) C D band, the 245 nm major ( -) C D band, the 219 nm minor ( + ) CD band, and the 208 nm minor ( -) CD band, becom es non-conservative in appearance at 0.01 < r < 0.12 and assumes the spectral characteristics of a left-handed D N A double helix at 0.12 < r > 1.0. The presence of a number of isoellipticity points shows that welldefined equilibria exist between the various chiroptical forms of mercurated DNA . The CD changes are totally reversible upon the removal of H g(II), at least up to r = 1.0, demonstrating that H g(II) keeps all base pairs in register.

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