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Relevant bibliographies by topics / Linear dichroism (LD)

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Academic literature on the topic 'Linear dichroism (LD)'

Author: Grafiati

Published: 3 June 2025

Last updated: 6 July 2025

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Journal articles on the topic "Linear dichroism (LD)"

1

Sharma, Vishakha, Yogita Kalra, and Ravindra Kumar Sinha. "Chiral perovskite based metasurface for linear and circular dichroism." Journal of Optics 26, no. 12 (2024): 125103. http://dx.doi.org/10.1088/2040-8986/ad80a7.

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Abstract Chiral metasurfaces provide ultracompact devices for polarization modification and detection. In this paper, high linear dichroism (LD) and dual band circular dichroism (CD) using superstructural chiral structure with inbuilt resonance cavities based on metal perovskite metal layer is proposed. Under circularly polarised incident waves, the metasurface exhibits a dual-band CD with a maximum value of 0.81. On the other hand, the suggested design also accomplishes efficient LD of 0.95. Additionally, independent control over each resonance wavelength may be attained by modifying parameters inside each resonance cavities. This will significantly contribute to the advancement of tunable dichroic devices and flat polarization optical components in optical integrated systems.

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Takahashi, Masayuki, and Bengt Norden. "Linear Dichroism Measurements for the Study of Protein-DNA Interactions." International Journal of Molecular Sciences 24, no. 22 (2023): 16092. http://dx.doi.org/10.3390/ijms242216092.

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Linear dichroism (LD) is a differential polarized light absorption spectroscopy used for studying filamentous molecules such as DNA and protein filaments. In this study, we review the applications of LD for the analysis of DNA-protein interactions. LD signals can be measured in a solution by aligning the sample using flow-induced shear force or a strong electric field. The signal generated is related to the local orientation of chromophores, such as DNA bases, relative to the filament axis. LD can thus assess the tilt and roll of DNA bases and distinguish intercalating from groove-binding ligands. The intensity of the LD signal depends upon the degree of macroscopic orientation. Therefore, DNA shortening and bending can be detected by a decrease in LD signal intensity. As examples of LD applications, we present a kinetic study of DNA digestion by restriction enzymes and structural analyses of homologous recombination intermediates, i.e., RecA and Rad51 recombinase complexes with single-stranded DNA. LD shows that the DNA bases in these complexes are preferentially oriented perpendicular to the filament axis only in the presence of activators, suggesting the importance of organized base orientation for the reaction. LD measurements detect DNA bending by the CRP transcription activator protein, as well as by the UvrB DNA repair protein. LD can thus provide information about the structures of protein-DNA complexes under various conditions and in real time.

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Razmkhah, Kasra, Nikola Paul Chmel, Matthew I. Gibson, and Alison Rodger. "Oxidized polyethylene films for orienting polar molecules for linear dichroism spectroscopy." Analyst 139, no. 6 (2014): 1372–82. http://dx.doi.org/10.1039/c3an02322b.

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4

Cheng, Bo, Yuxiao Zou, and Guofeng Song. "Full Stokes Mid-Wavelength Infrared Polarization Photodetector Based on the Chiral Dielectric Metasurface." Photonics 11, no. 6 (2024): 571. http://dx.doi.org/10.3390/photonics11060571.

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Conventional imaging techniques can only record the intensity of light while polarization imaging can record the polarization of light, thus obtaining a higher dimension of image information. We use the COMSOL software to numerically propose a circular polarization photodetector composed of the dislocated 2-hole Si chiral metasurfaces controlling the circular polarization lights and the HgCdTe (MCT) photodetector chip to detect the intensity of light signals. The chiral metasurfaces can be equated to a significant radiation source of the Z-type current density under the right circularly polarized incidence conditions, which explains the large circular dichroism (CD) of absorption of 95% in chiral photodetectors. In addition, the linear dichroism (LD) of the linear polarization pixel is 0.62, and the extinction ratio (ER) is 21 dB. The full Stokes pixel using the six-image-element technique can almost measure arbitrary polarization information of light at 4 μm operation wavelength. Our results highlight the potential of circular dichroic metasurfaces as photonic manipulation platforms for miniaturized polarization detectors.

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Xie, Huifang, Xin Ma, Wenbin Lin, et al. "Linear Dextrin as Potential Insulin Delivery System: Effect of Degree of Polymerization on the Physicochemical Properties of Linear Dextrin–Insulin Inclusion Complexes." Polymers 13, no. 23 (2021): 4187. http://dx.doi.org/10.3390/polym13234187.

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In the current study, linear dextrin (LD) was prepared using waxy potato starch debranched with pullulanase, which has attracted immense interest in the food, pharmaceutical, and cosmetic industries as a versatile ingredient. Various LDs were separated on the basis of their differential solubility in aqueous/ethanol solutions of different volumetric ratios. Three LD products—LD Fabrications with 40% ethanol (F-40); LD Fabrications with 50% ethanol (F-50); and LD Fabrications with 60%, 70%, and 80% ethanol (F-M)—were obtained with an average degree of polymerization (DP) values of 31.44, 21.84, and 16.10, respectively. The results of Fourier transform infrared spectroscopy (FT-IR) analysis revealed that the reaction mainly involved hydrogen bonding and a hydrophobic interaction between LD and insulin in the process of inclusion complex formation. X-ray diffraction (XRD) results indicated that insulin was encapsulated in LD. The results of circular dichroism (CD) showed that the changes in the secondary structure of insulin were negligible during the release from the inclusion complexes. The order of encapsulation capacity is as follows: the complex composed of F-M and insulin (F-M-INS) > the complex composed of LD and insulin (LD-INS) > the complex composed of F-50 and insulin (F-50-INS) > and the complex composed of F-40 and insulin (F-40-INS). F-M-INS inclusion complexes showed a better effect on reducing the release of insulin in gastric juice and promoting the release of insulin in intestinal juice and blood plasma than LD-INS.

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6

Ali, Aysha, Haydn A. Little, Jake G. Carter, et al. "Combining bacteriophage engineering and linear dichroism spectroscopy to produce a DNA hybridisation assay." RSC Chemical Biology 1, no. 5 (2020): 449–54. http://dx.doi.org/10.1039/d0cb00135j.

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A novel DNA sensing method based on LD spectroscopy and using bionanoparticle scaffolds is described, as demonstrated by the rapid detection of DNA strands associated with bacterial and viral pathogens.

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7

Günther, Lisa M., Jasper Knoester, and Jürgen Köhler. "Limitations of Linear Dichroism Spectroscopy for Elucidating Structural Issues of Light-Harvesting Aggregates in Chlorosomes." Molecules 26, no. 4 (2021): 899. http://dx.doi.org/10.3390/molecules26040899.

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Linear dichroism (LD) spectroscopy is a widely used technique for studying the mutual orientation of the transition-dipole moments of the electronically excited states of molecular aggregates. Often the method is applied to aggregates where detailed information about the geometrical arrangement of the monomers is lacking. However, for complex molecular assemblies where the monomers are assembled hierarchically in tiers of supramolecular structural elements, the method cannot extract well-founded information about the monomer arrangement. Here we discuss this difficulty on the example of chlorosomes, which are the light-harvesting aggregates of photosynthetic green-(non) sulfur bacteria. Chlorosomes consist of hundreds of thousands of bacteriochlorophyll molecules that self-assemble into secondary structural elements of curved lamellar or cylindrical morphology. We exploit data from polarization-resolved fluorescence-excitation spectroscopy performed on single chlorosomes for reconstructing the corresponding LD spectra. This reveals that LD spectroscopy is not suited for benchmarking structural models in particular for complex hierarchically organized molecular supramolecular assemblies.

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8

Lee, Changyun, Lindan Gong, Youngku Shon, et al. "Bis-intercalation of a cationic porphyrin dimer linked with trietylene glycol derivative to DNA from the major groove." Journal of Porphyrins and Phthalocyanines 16, no. 11 (2012): 1159–66. http://dx.doi.org/10.1142/s1088424612501283.

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The binding mode of a porphyrin dimer to double stranded native DNA was investigated in this study using normal electric absorption, circular dichroism (CD) and linear dichroism (LD) spectroscopies. At the time of mixing, the spectral properties of the porphyrin dimer upon its association with DNA were characterized by hypochromism and a red shift in the absorption spectrum and by complicated CD and negative LD in the Soret region. As time elapsed, the CD spectrum became a negative single band and the negative LD signal increased. These spectral changes suggested that the majority of both porphyrin moieties of the dimer intercalated between the DNA base-pairs. The changes in the spectral characteristics of the DNA bound porphyrin-dimer were similar when the minor groove of DNA was saturated by 4′,6-diamidino-2-phenylindole (DAPI), which is well-known minor groove binding molecule. The spectral properties of DAPI, which can be summarized by a large positive induced CD in the DAPI absorption region (300~400 nm) and wavelength-independent positive reduced LD, remained intact when the porphyrin dimer was present. These observations indicated that both DAPI and porphyrin bind to DNA simultaneously, and furthermore, the bis-intercalation of the porphyrin dimer occurs in the major groove.

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Takanabe, Akifumi, Masahito Tanaka, Hideko Koshima, Motoo Shiro, and Toru Asahi. "Optical properties of chiral photomechanical salicylideneaniline crystal." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C379. http://dx.doi.org/10.1107/s205327331409620x.

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Mechanical motion caused by UV/VIS radiation onto bulk materials is called a photomechanical effect. In other words, the photomechanical effect is a type of energy conversion systems. Recently, a mechanical bending of photochromic diarylethene crystals was reported, and the molecular-scale motion was found to produce the macroscale bending of the crystals (Kobatake et al., 2007). Subsequently, several photomechanical crystals have been reported to provide promising opportunities for artificial molecular machinery. The mechanism of the conversion of light energy to mechanical energy, however, has not quantitatively been understood. In photomechanical effect, microscale structural change and stress should be involved with optical properties of anisotropy and chirality; linear birefringence (LB), linear dichroism (LD), circular dichroism (CD) and optical rotatory power (ORP). CD and ORP in a chiral anisotropic crystal are extremely difficult to be measured owing exclusively to the contribution of strong linear anisotropy. The High Accuracy Universal Polarimeter generalized by our group (G-HAUP) enables us to measure LB, LD, CD, and ORP simultaneously and quantitatively (Tanaka et al., 2012). The purpose of our study is to investigate the relationship between microscale structural change or stress induced by UV/VIS radiation and the four optical properties. We synthesized chiral N-3,5-di-tert-butylsalicylidene-1-phenylethylamine photochromic crystal, as shown in Scheme 1, because the mechanism of photomechanical effect in this crystal has been revealed qualitatively by analyzing single-crystal structure under UV/VIS radiation (Koshima et al., 2013). The LB, LD, CD, and ORP spectra in the direction perpendicular to (001) were successfully measured under VIS radiation. Furthermore, LD spectrum was found to change by UV radiation in 30mW/cm2. These results could contribute to an elucidation of the mechanism of photomechanical effect quantitatively.

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Taniguchi, Takuya, Kazuhiko Ishikawa, Kenta Nakagawa, Masahito Tanaka, and Toru Asahi. "Measurement of chiroptical properties of nickel sulfate hexahydrate with G-HAUP." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C1779. http://dx.doi.org/10.1107/s2053273314082205.

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A crystal, which belongs to a lower crystal system than cubic one, exhibits optical anisotropies. The optical anisotropies originate from the difference in refraction and absorption between orthogonally linearly polarized lights. When molecules forming a crystal are enantiomers with the same chirality or form helical structures with the same handedness, the crystal shows chiroptical properties, which originate from the difference in refraction and absorption between right and left circularly polarized lights. The four optical phenomena are called linear birefringence (LB), linear dichroism (LD), circular birefringence (CB) and circular dichroism (CD), respectively. It had been difficult to measure CB and CD in chiral crystals with optical anisotropies because the signals of the anisotropies are three or four orders of magnitude larger than those of chiroptical properties. The Generalized High Accuracy Universal Polarimeter (G-HAUP) [1] enables us to simultaneously measure LB, LD, CB and CD of any anisotropic crystal. Nickel sulfate (NS) is achiral in the solution state. However, in the crystalline state, it forms hexahydrate and exhibits chirality since molecules are put in helical arrangements. The NS crystal belongs to an enantiomorphous space group, P41212 or P43212. Many researchers have reported the optical properties of NS crystal because large and good-quality crystals are readily grown. However, we consider the LB, LD, CB and CD in NS crystal should be simultaneously and completely investigated. The purpose of this study is to obtain LB, LD, CB and CD along the a axis with G-HAUP and compare the CB and CD with the results along the c axis. We measured optical rotatory power (ORP) along the c axis with G-HAUP, which agrees with the previous results [2,3]. We then prepared for some samples with chirality and anisotropy. We measured LB, LD, CB and CD spectra, respectively and will demonstrate the relation between their optical properties and structures.

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Book chapters on the topic "Linear dichroism (LD)"

1

Mäntele, W., K. Steck, T. Wacker, W. Welte, B. Levoir, and J. Breton. "Linear Dichroism (LD) and Absorption Spectra of Crystals of B800–850 Light-Harvesting Complexes of Rhodopseudomonas capsulata." In Antennas and Reaction Centers of Photosynthetic Bacteria. Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82688-7_15.

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2

Ivanova, Bojidarka, and Tsonko Kolev. "Linear-Dichroic Infrared (IR-LD) Spectroscopy Background." In Linearly Polarized IR Spectroscopy. CRC Press, 2024. http://dx.doi.org/10.1201/9781003578086-1.

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3

Lous, E. J., and A. J. Hoff. "Anisotropic Magnetic Field Effects of the Photosynthetic Bacterial Reaction Center of Rhodobacter sphaeroides R-26, Studied by Linear Dichroic Magneto-optical Difference Spectroscopy (LD-MODS) in the Temperature Range 1.2 – 310 K." In The Photosynthetic Bacterial Reaction Center. Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-0815-5_10.

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4

Rodger, Alison, and Bengt Norden. "Linear dichroism of biomolecules." In Circular Dichroism and Linear Dichroism. Oxford University PressOxford, 1997. http://dx.doi.org/10.1093/oso/9780198558972.003.0003.

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Abstract In this chapter we shall see how LD can be used to study macromolecules of biological interest. In contrast to the previous chapter, we shall deal with proteins fairly quickly as LD has been less widely used for these molecules than for DNAs. Our main concern will be with DNA since LD, particularly flow and electric field LD, has been used to great effect in the study of the conformation of DNA and binding geometries of DNA-drug systems. Since LD is conceptually quite simple (much simpler than CD) the reader will be able to follow easily the deduction of structural information for biopolymers in the examples of this chapter. The formal mathematical framework for LD is presented in Chapter 4 for more general cases of LD spectroscopic applications.

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Rodger, Alison, and Bengt Norden. "Linear dichroism of small molecules." In Circular Dichroism and Linear Dichroism. Oxford University PressOxford, 1997. http://dx.doi.org/10.1093/oso/9780198558972.003.0004.

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Abstract LD spectra are quickly measured and usually easy to interpret. However, not many research groups use LD because the equipment required for orienting samples is not currently commercially available. An aim in this book is to show that establishing LD facilities is fairly straightforward and that the effort is well recompensed by the data that can be collected.

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Nordén, Bengt, Alison Rodger, and Timothy Dafforn. "5 Advanced LD methods for biological macromolecules." In Linear Dichroism and Circular Dichroism. The Royal Society of Chemistry, 2010. http://dx.doi.org/10.1039/bk9781847559029-00105.

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7

Rodger, Alison, and Bengt Norden. "Spectroscopy, chirality, and oriented systems." In Circular Dichroism and Linear Dichroism. Oxford University PressOxford, 1997. http://dx.doi.org/10.1093/oso/9780198558972.003.0001.

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Abstract Many of the questions we ask about chemical and biological systems relate to what shapes molecules have and how they interact with each other. New or modified methods are constantly being developed to address these questions, either in response to new problems or as the result of technical advances. The aim of this book is to show how circular dichroism (CD) and linear dichroism (LD) spectroscopies can be used to provide information about molecular structure and about interactions between molecules.

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8

Asahi, Toru, Masahito Tanaka, Kenta Nakagawa, et al. "Chiroptical Studies on Anisotropic Condensed Matter: Principle and Recent Applications of the Generalized-High Accuracy Universal Polarimeter." In Crystal Growth - Technologies and Applications [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.108721.

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Chiroptics is the study of the changes in circular polarization states of light transmitted through analytes typically dissolved in isotropic solutions. However, experimental challenges have long prevented chiroptical measurements of anisotropic media such as single crystals of low symmetry, liquid crystals, or structured films. The high accuracy universal polarimeter (HAUP) was introduced in 1983 to investigate the differential refraction of left and right circular polarization states, circular birefringence (CB), and even in anisotropic media that are dominated by the differential refraction of orthogonal linear polarization states, linear birefringence (LB). In this century, the HAUP was extended to also measure not only the dispersive optical effects (CB and LB) but also the corresponding dissipative effects, circular dichroism (CD) and linear dichroism (LD), differences in light absorption. The improved device is the generalized-HAUP (G-HAUP). Not only can it deliver all the linear optical properties of dissymmetric, anisotropic, and absorbing media, but it can also do so in the ultraviolet as well as the visible part of the electromagnetic spectrum. In this review, characteristic features of the G-HAUP and its applications to crystals of photomechanical salicylidenephenylethylamines, alanine, benzil, and magneto-optical CeF3 are described.

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"Linear-Dichroic Infrared (IR-LD) Spectroscopy." In Linearly Polarized IR Spectroscopy. CRC Press, 2011. http://dx.doi.org/10.1201/b11197-2.

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