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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"amide I"”.
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Computational Amide I Spectroscopy from the ground up : building and benchmarking new tools to study disordered peptide ensembles
… tools for characterizing IDP ensembles using Amide I (backbone carbonyl stretch) vibrational spectroscopy. In this approach, the infrared (IR) absorption frequencies of isotope-labeled amide bonds act as sensitive probes of local electrostatic environment and, ultimately, of local structure. …
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Investigation of the Role of Amide I to Amide II Ratio and Alpha Helix to Beta Sheet Ratio of Faba Bean Seeds in the Determination of Microbial Protein Synthesis and Animal Performance and Metabolism in Ruminant Livestock Systems.
… been previously evaluated, and the influence of amide I to amide II ratio, and α-helix to β-sheet ratio (α_β) on the protein quality (solubility and digestibility), metabolism, and bioavailability in dairy cows has not been established. Thus, the objective of this research was to evaluate the …
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Observing the unfolding transition of [beta]-hairpin peptides with nonlinear infrared spectroscopy
… to describe the folding pathway. In this work, amide I vibrational spectroscopy is used to resolve the secondary structure of P-hairpin peptides during thermal denaturation. Spectroscopic modeling is presented to describe the amide I band of 0-hairpins and relate it to structural features. Three …
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Experimental spectroscopic and theoretical studies of amino acid derivatives
… differ. The conformation of the trans amide moiety changes with the carbon chain length of the side chain of the amino acid derivatives. In the computed structures of N-acetyl-L-Asp and N-acetyl-L-Glu all backbone atoms are in-plane, except the side chain group; with respect to C2-C3 …
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Studies of biofluid analysis using 2D-IR spectroscopy
… infrared peak relating to protein studies, the amide I band, overlaps with the bending mode of H2O, making label-free detection of the protein content in serum challenging. This project demonstrates that 2D-IR can surmount the major obstacle to serum protein analysis as the 2D-IR amide I …
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Supersonic jet spectroscopy of synthetic foldamers, multichromophores, and their water containing clusters
… and infrared intensities of the local amide I and amide II modes and their amide I/I and amide II/II coupling constants. These amide I/I and amide II/II coupling constants remain similar in size for α-, β-, and γ-peptides despite the increasing number of C-C bonds separating the amide …
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Multi-mode two-dimensional infrared spectroscopy of peptides and proteins
… on the effects of solvation and structure on the amide vibrations. Differences in vibrational coupling, transition dipole angles and the anharmonic potential of the amide vibrations of isotopologues of N-methylacetamide arise from significant change in the local mode composition of the amide II …
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EFFECT OF GENOTYPES, TANNIN LEVEL AND PROCESSING METHODS ON THE PHYSICOCHEMICAL, NUTRITIONAL AND STRUCTURAL CHARACTERISTICS OF FABA BEAN GROWN IN WESTERN CANADA
… higher absorbance in normal tannin genotypes for amide I and amide II peak height and area, structural CHO (STCHO), total CHO (TCHO) area and peaks (H_1015, H_1076, H_1145) and cellulosic compounds (CEC) to total CHO (TCHO) ratio. Amide I area and α-helix absorbance were not different among low …
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Vibrational spectroscopic studies of the structure and conformation of cyclic di-amino acid peptides
… of the diketopiperazine (DKP) ring and the cis amide geometry of the peptide bond, in relation to the vibrational spectra of a series of cyclic di-amino acid peptides (CDAPs). Experimental Raman and infra-red spectra have been recorded for the following CDAPs: cyclo(Gly-Gly), cyclo(L-Ala-L-Ala), …
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Αξιολόγηση αποτελεσματικότητας της φαρμακοθεραπείας για το πολλαπλούν μυέλωμα μέσω FTIR φασματοσκοπίας
… κυανή μετατόπιση (blue shift) της κορυφής Amide I στα 1645 cm-1 και κορύφωση του λόγου Amide I/II (1,116), υποδεικνύοντας εκτεταμένο ξεδίπλωμα (unfolding) των πρωτεϊνών. Η ζώνη των 1740 cm-1 (νC=O αλδεϋδών/εστέρων) κατέγραψε την οξειδωτική βλάβη και τη λιπιδική υπεροξείδωση, εμφανίζοντας …
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Effect of Antibiotic Pastes on Chemical Structure and Microhardness of Radicular Dentin
… Infrared Spectroscopy to measure the phosphate/amide I ratios of dentin (n = 7). Results: The 1 g/mL of TAP or MTAP and the 1 mg/mL methylcellulose-based TAP caused significant reduction in microhardness of roots compared with untreated control roots at 500 µm and 1000 µm from the pulp-dentin …
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Temperature-jump 2D IR spectroscopy to study protein conformational dynamics
… by probing the frequency changes associated with amide I backbone vibrations. Combining 2D IR with a perturbing laser-induced T-jump enables the study of conformational dynamics from 5 ns to 50 ms. To access a finer time-sampling of the conformational evolution, a one-dimensional variant of 2D IR, …
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Hydrogen bonding and solvation dynamics of n-methylacetamide in denatured water (D₂O) or denatured chloroform (CDCl₃) from nonlinear spectroscopy
Hydrogen bonding between N-methylacetamide (NMA) and different solvents (D₂O or CDCl₃) was studied by using two-dimensional infrared spectroscopy to probe the frequency fluctuations of the amide I mode of the solvated NMA. An iterative fitting approach was used to extract a correlation function …
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Study of locally unfolded forms of cytochrome c by Fourier transform infrared and of H2O2-mediated oxidation of ferricytochrome c and metmyoglobin by mass spectrometry
… absorption and Fourier transform infrared (FTIR) amide II band as a function of temperature was monitored, revealing that the alkaline form of tuna cyt c appears about 20C̕ lower (V35C̕) than those of horse and cow cyts c (V55-60C̕). The cyts c also exhibit increased susceptibility to tryptic …
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Thermal unfolding dynamics of proteins probed by nonlinear infrared spectroscopy
… infrared (IR) spectroscopy of the protein amide I band. Among various nonlinear IR techniques, two-dimensional infrared (2D IR) spectroscopy, which is an IR analogue of 2D NMR, is the most informative. A 2D IR spectrum is obtained from a double Fourier transform of the heterodyned …
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Experimental and theoretical vibrational spectroscopic studies of diketopiperazines
… is assigned to the C=O stretching mode (cis amide I mode). On deuteration the cis amide I band shows a downward shift of around 54 cm-1 in the Raman spectrum; this can be attributed to stronger coupling and high N-H character compared with other DKPs. The cis amide II mode is found at 1506 …
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Investigation of the interaction of GdnHCl with poly-L-lysine, horseradish peroxidase and cytochrome c monitored via FTIR, CD and fluorescence spectroscopies
… species were reported. Curvefitting of the FTIR amide I ' mode (1600-1700 cm -1 ) revealed that tuna c contained more residual structure in Gdn-d 5 -DCl than horse c. It was successfully demonstrated that FTIR is a powerful tool for probing the chemically denatured states of model protein …
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The Structural Requirements of Gastrin and Glycine-Extended Gastrin for Binding to Receptors from Normal and Cancerous Human Tissues
… peptides is folded in a similar manner. The amide I' VCD spectra of [Pro13, Leul5]G(l 1-17) in SDS/D20, TFE-D,, and DMSO-D6 shared similar characteristics suggesting that a common secondary structure is present in all three solvent systems. The amide I’ VCD spectra of the other analogs varied …
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Conformational and Orientational Dynamics of Semi-Rigid Macromolecules in Shear Flow
… of $\beta$-sheet structure evidenced by the amide I band at 1666 cm$\sp{-1}$. CD measurements indicated that solutions of predominantly $\alpha$-helical conformation at 20$\sp\circ$C transformed into 85% $\alpha$-helix and 15% $\beta$-sheet after being sheared for 20 minutes. However, on …
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Interactive Association Between Molecular Structure Spectral Profiles and Nutrient Utilization and Availability of Leaf, Stem, Pods, and Whole Plant Faba Bean Forage in Ruminants Before and After Rumen Incubation
… spectral parameters, peak height of beta sheet, amide I, peak area of amide II and area ratio of amide I to amide II, spectral intensity was decreased with increasing time of incubation. In other spectral parameters, incubation time was interacted with different types of faba bean samples. As for …
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