Academic literature on the topic 'Helical Dichroism'

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Journal articles on the topic "Helical Dichroism"

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Oda, Reiko, Peizhao Liu, Yann Battie, et al. "(Invited) Chiral Perovskite Nanocrystals Growth inside Helical Hollowsilica Nanoribbons." ECS Meeting Abstracts MA2023-01, no. 14 (2023): 1344. http://dx.doi.org/10.1149/ma2023-01141344mtgabs.

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Nanometric silica helical ribbons are used as platforms 1) to graft Perovskyte nano crystals and 2) grow in-situ Perovskyte crystals having helical shape using supersaturated recrystallization method. For both systems, they show strong induced circular dichroism (CD) and induced circularly polarized luminescence (CPL) signals, with very high dissymetric g-factors. The signs of these signals depend on the handedness of the helices. Right-handed and left-handed PNCs show respectively positive and negative CD and CPL signals. Simulations based on the boundary element method demonstrate that the c
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Xie, Yun Zhi, Chun Hua Liu, Xun Li, Yi Bao Li, and Xiao Lin Fan. "Asymmetry-Induced Supramolecular Helices of Pyrene-Perylene Bisimide Triads." Advanced Materials Research 472-475 (February 2012): 462–65. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.462.

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The formation of helical nanostructure is investigated for donor/acceptor system. The helices of the supramolecular nanofibres can be revealed by atom force microscope (AFM) and circular dichroism (CD) measurement. The expermental results show the Py-Per-Py can self assembly into helical nanofibres. The controlled experiments on the compound Py-e-Per-e-Py with symmetrical conformation indicates the formation of helical nanofibres may be attributed to asymmetrical conformation.
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Miles, A. J., and B. A. Wallace. "Circular dichroism spectroscopy of membrane proteins." Chemical Society Reviews 45, no. 18 (2016): 4859–72. http://dx.doi.org/10.1039/c5cs00084j.

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Daly, Steven, Frédéric Rosu, and Valérie Gabelica. "Mass-resolved electronic circular dichroism ion spectroscopy." Science 368, no. 6498 (2020): 1465–68. http://dx.doi.org/10.1126/science.abb1822.

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DNA and proteins are chiral: Their three-dimensional structures cannot be superimposed with their mirror images. Circular dichroism spectroscopy is widely used to characterize chiral compounds, but data interpretation is difficult in the case of mixtures. We recorded the electronic circular dichroism spectra of DNA helices separated in a mass spectrometer. We studied guanine-rich strands having various secondary structures, electrosprayed them as negative ions, irradiated them with an ultraviolet nanosecond optical parametric oscillator laser, and measured the difference in electron photodetac
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Liu, Yong, Chao Li, Yaling Liu, and Zhiyong Tang. "Helical silver(I)-glutathione biocoordination polymer nanofibres." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 371, no. 2000 (2013): 20120307. http://dx.doi.org/10.1098/rsta.2012.0307.

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Helical nanofibres of silver(I)-glutathione (Ag-GSH) biocoordination polymer (BCP) are fabricated by introducing dimethyl sulfoxide into the mixture solution of Ag + ions and l -GSH molecules. The prepared BCP nanofibres show hierarchical helical structures, which are constructed via twisting of small fibres. Water-soluble helices could be further cross-linked with Ca 2+ ions to form a well-dispersed aqueous suspension. When gold nanorods are adsorbed onto these helical nanofibres, the unique plasmon-induced circular dichroism characteristic is observed in the region of the local surface plasm
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Lu, S., V. E. Reyes, R. A. Lew, et al. "Role of recurrent hydrophobic residues in catalysis of helix formation by T cell-presented peptides in the presence of lipid vesicles." Journal of Immunology 145, no. 3 (1990): 899–904. http://dx.doi.org/10.4049/jimmunol.145.3.899.

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Abstract We tested the hypothesis that the recurrence of hydrophobic amino acids in a polypeptide at positions falling in an axial, hydrophobic strip if the sequence were coiled as an alpha helix, can lead to helical nucleation on a hydrophobic surface. The hydrophobic surface could anchor such residues, whereas the peptide sequence grows in a helical configuration that is stabilized by hydrogen bonds among carbonyl and amido NH groups along the peptidyl backbone of the helix, and by other intercycle interactions among amino acid side chains. Such bound, helical structures might protect peptid
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Kaschke, Johannes, and Martin Wegener. "Optical and Infrared Helical Metamaterials." Nanophotonics 5, no. 4 (2016): 510–23. http://dx.doi.org/10.1515/nanoph-2016-0005.

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AbstractBy tailoring metamaterials with chiral unit cells, giant optical activity and strong circular dichroism have been achieved successfully over the past decade. Metamaterials based on arrays of metal helices have revolutionized the field of chiral metamaterials, because of their capability of exhibiting these pronounced chiro-optical effects over previously unmatched bandwidths. More recently, a large number of new metamaterial designs based on metal helices have been introduced with either optimized optical performance or other chiro-optical properties for novel applications.The fabricat
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Ala, Paul, Pele Chong, Vettai S. Ananthanarayanan, Neville Chan, and Daniel S. C. Yang. "Synthesis and characterization of a fragment of an ice nucleation protein." Biochemistry and Cell Biology 71, no. 5-6 (1993): 236–40. http://dx.doi.org/10.1139/o93-036.

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Synthetic peptides were used as models for studying the conformation of ice nucleation proteins. We chemically synthesized four peptides (16-, 24-, 32-, and 48-mer) that consisted of two to six repeats of the consensus repeating octapeptide unit of ice nucleation proteins and evaluated their conformation by circular dichroism spectroscopy. These model peptides exist predominantly as random coils in aqueous solution, but adopt α-helical structures in the presence of trifluoroethanol. The stability of their secondary structures was investigated by monitoring the pH and time dependence of their c
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Liang, Kaichang, Lichao Dong, Na Jin, et al. "The synthesis of chiral triphenylpyrrole derivatives and their aggregation-induced emission enhancement, aggregation-induced circular dichroism and helical self-assembly." RSC Advances 6, no. 28 (2016): 23420–27. http://dx.doi.org/10.1039/c5ra26985g.

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Kaerkitcha, N., and T. Sagawa. "Amplified polarization properties of electrospun nanofibers containing fluorescent dyes and helical polymer." Photochemical & Photobiological Sciences 17, no. 3 (2018): 342–51. http://dx.doi.org/10.1039/c7pp00413c.

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Well-aligned nanofibers containing cationic fluorescent dyes and anionic chiral polymers prepared via electrospinning exhibit an enhanced circular dichroism, which is mainly caused by linear dichroism and linear birefringence.
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Dissertations / Theses on the topic "Helical Dichroism"

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Yang, Lin. "Interaction of molecules and helical nanoparticles characterized by electronic circular dichroism." HKBU Institutional Repository, 2018. https://repository.hkbu.edu.hk/etd_oa/523.

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It is of fundamental significance to differentiate an enantiomer from its mirror image (i.e., enantiodifferentiation), through monitoring optical activity (OA) of enantiomers that is typically characterized by electronic circular dichroism (ECD or CD) in the UV-visible region. However, sub-wavelength molecular dimensions substantially prevent enantiomers from effectively perceiving the different circular polarization states, leading to low enantiomeric OA and weak enantiodifferentiation. Some approaches have been developed to amplify the enantiomeric OA; alternatively, on the basis of the emer
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Strong, Andrew Edward. "Self-assembling monolayers of helical oligopeptides with applications in molecular electronics." Thesis, University of Strathclyde, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366950.

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Takeda, Ryohei. "Effect of Chiral Solvent and Pressure on the Dynamic Screw-Sense Induction to Poly(quinoxaline-2,3-diyl)s." Kyoto University, 2017. http://hdl.handle.net/2433/227637.

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Kato, Kenichi. "Development of Fused Porphyrins with Unpaired Electrons and/or Chirality." Kyoto University, 2020. http://hdl.handle.net/2433/253108.

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Rahimiangolkhandani, Mitra. "Interaction of Structured Femtosecond Light Pulses with Matter." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42334.

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Physics and potential applications of femtosecond laser pulses interacting with matter have captured interest in various fields, such as nonlinear optics, laser micromachining, integrated optics, and solar cell technologies. On the one hand, such ultrashort intense pulses make them practical elegant tools to be utilized for direct structuring of materials with high accuracy and numerous potential applications. On the other hand, studying the fundamental aspects and nonlinear nature of such interactions opens new remarkable venues for various unique investigations. In recent years, the emerging
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Taboury, Jean. "Etude des conformations en double hélice droite et en double hélice gauche d'ADN synthétiques par plusieurs techniques spectroscopiques." Paris 13, 1985. http://www.theses.fr/1985PA132021.

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Adam, Safia. "Etude des conformations secondaires d'ADN synthétiques pas spectrométrie optique." Paris 13, 1985. http://www.theses.fr/1985PA132001.

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Pathan, Shaheen. "Développement de matériaux flexibles optiquement actifs basés sur des nanostructures hybrides chirales de modèle d’assemblage moléculaire." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0126.

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Dans ce travail, nous nous sommes concentrés sur la création de nanostructures chirales optiquement actives en fabriquant des nanohélices de silice fluorescente afin d’obtenir des matériaux souple, nanométriques, optiquement actifs pour des applications en tant que matériaux nanophotoniques. Dans cette optique, des nanohélices de silice chirales ont été utilisées pour greffer et organiser des nanocristaux inorganiques fluorescents achiraux tels que des quantums dots, des chromophores, des molécules et des polymères fluorescents selon différentes approches. Ces hélices inorganiques ont été form
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Mangavel, Cécile. "Peptides amphiphiles hélicogènes : comportement en solution aqueuse et interaction avec des membranes modèles." Orléans, 1996. http://www.theses.fr/1996ORLE2043.

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Les interactions entre peptides amphiphiles helicogenes et membranes jouent un role fondamental dans de nombreux mecanismes biologiques. D'une grande diversite de sequences primaires, ces peptides possedent la propriete commune d'adopter une structure secondaire d'helice alpha en presence de membranes. Il semble donc que ce soit cette structure secondaire qui gouverne reellement l'interaction membranaire. Au cours de ce travail, nous nous sommes interesses a des peptides modeles dont les sequences primaires alternent residus hydrophiles et hydrophobes afin de favoriser la formation d'helices a
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Höger, Geralin. "Self-Organization of β-Peptide Nucleic Acid Helices for Membrane Scaffolding". Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://hdl.handle.net/21.11130/00-1735-0000-0003-C187-A.

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Book chapters on the topic "Helical Dichroism"

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Wang, Lijiang, Petr Pancoska, and Timothy A. Keiderling. "Detection of Triple Helical Nucleic Acids with Vibrational Circular Dichroism." In Fifth International Conference on the Spectroscopy of Biological Molecules. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1934-4_27.

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Batchelor, Matthew, Marcin Wolny, Marta Kurzawa, Lorna Dougan, Peter J. Knight, and Michelle Peckham. "Determining Stable Single Alpha Helical (SAH) Domain Properties by Circular Dichroism and Atomic Force Microscopy." In Methods in Molecular Biology. Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-8556-2_10.

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Fasman, Gerald D., Kyusung Park, and Andras Perczel. "Distinguishing Transmembrane Helices from Peripheral Helices by Circular Dichroism." In The Jerusalem Symposia on Quantum Chemistry and Biochemistry. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2718-9_3.

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Fasman, Gerald D. "Differentiation between Transmembrane Helices and Peripheral Helices by the Deconvolution of Circular Dichroism Spectra of Membrane Proteins." In Circular Dichroism and the Conformational Analysis of Biomolecules. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4757-2508-7_10.

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Moore, Dexter S. "Circular Dichroism of Large Oriented Helices: A Free Electron on a Helix." In Applications of Circularly Polarized Radiation Using Synchrotron and Ordinary Sources. Springer US, 1985. http://dx.doi.org/10.1007/978-1-4757-9229-4_14.

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Rodger, Alison, and Bengt Norden. "Analysis of circular dichroism: electric dipole allowed transitions." In Circular Dichroism and Linear Dichroism. Oxford University PressOxford, 1997. http://dx.doi.org/10.1093/oso/9780198558972.003.0005.

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Abstract The absorption spectrum of a solution of chiral molecules measured with left circularly polarized radiation would differ by at the very most 2% from that measured with unpolarized or right circularly polarized light. For most samples the difference between the absorbances measured with left and right circularly polarized light rarely exceeds ±0.001%. A CD spectrum is thus the result of a small difference between two large absorbance numbers. It gives only the helical or asymmetric part of the change that occurs when radiation is absorbed and this is probed by a combination of the elec
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Bulheller Benjamin M. and Hirst Jonathan D. "Ab Initio Calculations for Circular Dichroism and Synchrotron Radiation Circular Dichroism Spectroscopy of Proteins." In Advances in Biomedical Spectroscopy. IOS Press, 2009. https://doi.org/10.3233/978-1-60750-000-1-202.

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Circular dichroism (CD) and synchrotron radiation circular dichroism (SRCD) spectroscopy are widely used techniques for secondary structure determination of proteins. Using the matrix method, protein CD can be calculated from first principles, with an accuracy which is almost quantitative for helical proteins. Thus, CD calculations and experimental data can be used in conjunction to aid structure analysis.
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Huber, Pia A. J., Steven B. Marston, Julie L. Hodgkinson, and C. L. Albert Wang. "Caldesmon." In Guidebook to the Cytoskeletal and Motor Proteins. Oxford University PressOxford, 1999. http://dx.doi.org/10.1093/oso/9780198599579.003.0015.

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Abstract Smooth muscle caldesmon isolated from chicken gizzard migrates with an apparent molecular weight of 14 000 on SDS gels; cDNA sequencing gives molecular weights of 93 kDa for human and 89 kDa for chicken gizzard caldesmon. The protein sequence shows a long central α-helical region containing a repeated 13 (or 15) amino acid motif; the number of repeats is 8–12, depending on the degree of degeneracy allowed. Circular dichroism measurements of a central fragment are consistent with a helical structure. The 60 174 Da non-muscle caldesmon (I-CaD, for its lower molecular weight) is smaller
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Pazderková Markéta, Kočišová Eva, Pazderka Tomáš, et al. "Antimicrobial peptide from the eusocial bee Halictus sexcinctus interacting with model membranes." In Advances in Biomedical Spectroscopy. IOS Press, 2013. https://doi.org/10.3233/978-1-61499-184-7-079.

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Halictine-1 (Hal-1) – a linear antibacterial dodecapeptide isolated from the venom of the eusocial bee Halictus sexcinctus – has been subjected to a detailed spectroscopic study including circular dichroism, fluorescence and vibrational spectroscopy. We investigated Hal-1's ability to adopt an amphipathic α-helical structure upon interaction with model lipid based bacterial membranes (phosphatidylcholine/phosphatidylglycerol based large unilamellar vesicles, sodium dodecylsulfate micelles) and helix inducing components (trifluoroethanol). It was found that Hal-1 r
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Rodger, Alison, and Matthew A. Ismail. "Introduction to circular dichroism." In Spectrophotometry and Spectrofluorimetry. Oxford University Press, 2000. http://dx.doi.org/10.1093/oso/9780199638130.003.0008.

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Circular dichroism (CD) is the ideal technique for studying chiral molecules in solution. It is uniquely sensitive to the asymmetry of the system. These features make it particularly attractive for biological systems. CD is by definition the difference in absorption, A, of left and right circularly polarized light (CPL): . . . CD = Ae − Ar . . . . . . 1 . . . CPL has the electric field vector of the electromagnetic radiation retaining constant magnitude in time but tracing out a helix about the propagation direction. Following the optics convention we take the tip of the electric field vector
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Conference papers on the topic "Helical Dichroism"

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Citra, Mario J., M. G. Paterlini, Teresa B. Freedman, Adriano Fissi, and Osvaldo Pieroni. "Vibrational circular dichroism studies of 3 10 -helical solution conformers in dehydro-peptides." In Fourier Transform Spectroscopy: Ninth International Conference, edited by John E. Bertie and Hal Wieser. SPIE, 1994. http://dx.doi.org/10.1117/12.166677.

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Navesova, Yu V., M. N. Krakhalev, and T. A. Zotina. "THE STRUCTURAL AND OPTICAL PROPERTIES OF NEMATIC DOPED WITH PLANT PIGMENTS." In X Международная конференция молодых ученых: биоинформатиков, биотехнологов, биофизиков, вирусологов и молекулярных биологов — 2023. Novosibirsk State University, 2023. http://dx.doi.org/10.25205/978-5-4437-1526-1-196.

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The interaction between the complex of photosynthetic pigments from hornwort and the nematic liquid crystal LN-396 was investigated. It was found that a set of pigments induces twist in the nematic structure, with a helical twisting power of β = −2,84 µm−1. The study demonstrated that the liquid crystal orients the pigment molecules, which exhibited linear absorption dichroism with an extremum in the spectral range of 400–520 nm.
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Muro, T. "A Measurement System For Circular Dichroism In Soft X-ray Absorption Using Helicity Switching By Twin Helical Undulators." In SYNCHROTRON RADIATION INSTRUMENTATION: Eighth International Conference on Synchrotron Radiation Instrumentation. AIP, 2004. http://dx.doi.org/10.1063/1.1757978.

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Muro, T., T. Nakamura, T. Matsushita, et al. "Status of the Twin Helical Undulator Soft X-ray Beamline at SPring-8: Performance for Circular Dichroism Measurements." In SYNCHROTRON RADIATION INSTRUMENTATION: Ninth International Conference on Synchrotron Radiation Instrumentation. AIP, 2007. http://dx.doi.org/10.1063/1.2436125.

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Kuball, Hans-Georg, Ralph Kolling, Holger Bruening, and Bernhard Weiss. "Helical twisting power and circular dichroism as chirality observations: the intramolecular and intermolecular chirality transfer in a liquid crystal phase." In Liquid Crystals, edited by Jolanta Rutkowska, Stanislaw J. Klosowicz, Jerzy Zielinski, and Jozef Zmija. SPIE, 1998. http://dx.doi.org/10.1117/12.299976.

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Xiong, Kan, Eliana K. Asciutto, Jeffry D. Madura, Sanford A. Asher, P. M. Champion та L. D. Ziegler. "Circular Dichroism and UV Resonance Raman Study of the Impact of Salts and Alcohols on the Gibbs Free Energy Landscape of an α-helical Peptide". У XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY. AIP, 2010. http://dx.doi.org/10.1063/1.3482854.

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Abioye, Raliat, Chibuike Udenigwe, and Ogadimma Okagu. "Disaggregation of islet amyloid polypeptide fibrils as a potential anti-fibrillation mechanism of tetrapeptide TNGQ." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/szym9744.

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Islet amyloid polypeptide (IAPP) fibrillation has been commonly associated with the exacerbation of type 2 diabetes prognosis. Consequently, inhibition of IAPP fibrillation to minimize β-cell cytotoxicity is an important approach towards β-cell preservation and type 2 diabetes management. In this study, three tetrapeptides, TNGQ, MANT, and YMSV, were identified as potential IAPP fibrillation inhibitors. The potential anti-fibrillation mechanisms of these tetrapeptides were monitored using thioflavin T (ThT) fluorescence assay, circular dichroism (CD) spectroscopy, dynamic light scattering (D
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Benedetti, A., R. Li Voti, A. Belardini, et al. "Photoacoustic detection of circular dichroism in a square array of nano-helices." In 2015 Fotonica AEIT Italian Conference on Photonics Technologies. Institution of Engineering and Technology, 2015. http://dx.doi.org/10.1049/cp.2015.0135.

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Nakano, Sota, Takeshi Fujisawa, Takanori Sato, and Kunimasa Saitoh. "Beam propagation analysis of optical activity and circular dichroism in helically twisted photonic crystal fiber." In 2017 22nd Microoptics Conference (MOC). IEEE, 2017. http://dx.doi.org/10.23919/moc.2017.8244541.

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