Relevant bibliographies by topics / Alanine Spectra

Academic literature on the topic 'Alanine Spectra'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Alanine Spectra"

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Berezhinsky, L. I., G. I. Dovbeshko, M. P. Lisitsa, and G. S. Litvinov. "Vibrational spectra of crystalline β-alanine." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 54, no. 2 (February 1998): 349–58. http://dx.doi.org/10.1016/s1386-1425(97)00233-3.

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Liu, Jun, Feng-shan Zhou, Ran Guo, Ye Jiang, Xiaokun Fan, Anqi He, Yanjun Zhai, et al. "Analysis of an Alanine/Arginine Mixture by Using TLC/FTIR Technique." Journal of Spectroscopy 2014 (2014): 1–4. http://dx.doi.org/10.1155/2014/925705.

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We applied TLC/FTIR coupled with mapping technique to analyze an alanine/arginine mixture. Narrow band TLC plates prepared by using AgI as a stationary phase were used to separate alanine and arginine. The distribution of alanine and arginine spots was manifested by a 3D chromatogram. Alanine and arginine can be successfully separated by the narrow band TLC plate. In addition, the FTIR spectra of the separated alanine and arginine spots on the narrow band TLC plate are roughly the same as the corresponding reference IR spectra.
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Dagnelie, P. C., D. K. Menon, I. J. Cox, J. D. Bell, J. Sargentoni, G. A. Coutts, J. Urenjak, and R. A. Iles. "Effect of l-alanine infusion on 31P nuclear magnetic resonance spectra of normal human liver: towards biochemical pathology in vivo." Clinical Science 83, no. 2 (August 1, 1992): 183–90. http://dx.doi.org/10.1042/cs0830183.

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1. 31P n.m.r. spectroscopy in vivo was used to study the effect of l-alanine infusion on the concentrations of gluconeogenic intermediates in normal human liver. Studies were performed in six healthy male subjects (34–44 years, fasted overnight) using a chemical shift imaging pulse sequence on a whole-body n.m.r. system operating at 1.6T. Hepatic 31P n.m.r. spectra were obtained from 10 min before to 70 min after intravenous administration of 0.70 (n = 2), 1.40 (n = 3) or 2.80 (n = 5) nmol of l-alanine/kg body weight over 4.5 min. Concentrations of phosphomonoesters, Pi and phosphodiesters relative to ATP were calculated from peak areas in the n.m.r. spectra, using the β-ATP peak as a reference. 2. Dose-dependent spectral changes were observed for [phosphomonoesters]/[ATP] and [Pi]/[ATP]. At the highest dose given, maximal changes in [phosphomonoesters]/[ATP] (mean ± sem: 98 ± 12%, P<0.005) and [Pi]/[ATP] (−33 ± 3%, P<0.001) were observed approximately 45 min after the l-alanine infusion. [Phosphodiesters]/[ATP] showed a maximal increase of 24 ± 6% (P<0.05), which was independent of the l-alanine dose. Hepatic ATP levels and pH did not change. 3. To identify the metabolites responsible for the changes observed in vivo, male Wistar rats were infused with 11.2 mmol of l-alanine/kg body weight. After 15 min, livers were freeze-clamped and were extracted according to standard procedures. In vitro, 31P n.m.r. spectra obtained at 8.4 or 11.7 T revealed sharp increases in the concentrations of 3-phosphoglycerate and phosphoenolpyruvate after l-alanine infusion. No significant increases in other metabolites contributing to the phosphomonoester or phosphodiester resonances in vivo were observed, suggesting that the rise in [phosphomonoesters] observed in vivo was caused by increasing concentrations of 3-phosphoglycerate, and that phosphoenolpyruvate contributed to the rise in [phosphodiesters]. 5. These results show that l-alanine infusion leads to consistent changes in the 31P n.m.r. spectra of the human liver owing to increased concentrations of gluconeogenic intermediates. The ‘n.m.r.-alanine test’ may constitute a useful tool for studies of gluconeogenesis and hepatic biochemical pathology in vivo.
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Ermawati, Frida U. "SOPHE Computation on Alanine Single Crystal EPR Spectra." Jurnal Penelitian Fisika dan Aplikasinya (JPFA) 1, no. 1 (June 14, 2011): 23. http://dx.doi.org/10.26740/jpfa.v1n1.p23-32.

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Simulation of X-band first-derivative continuous-wave electron paramagnetic resonance (CW-EPR) experimental spectra of g-irradiated ℓ-α-alanine single crystal has been carried out. The aim was to confirm the existence of radical induced by irradiation in the system. A SOPHE computer simulation software suite (v. 1.1.3) was utilized for that purpose. Six different X-band spectra measured from a number of defined crystal orientations to the external magnetic field B were recorded and simulated. The “axial” spectra (refer to the simulated spectra when the external B field was parallel to the crystal axes and that was measured at room temperature) confirm the simultaneous presence of the SAR, R2 and R3 radicals with the appropriate proportions. The “planar” spectra (refer to the simulated spectra when the B field was on the crystal planes), however, do not exactly fit to the experimental spectra. Together with the simulation outcomes, the problems that appear during the work, as well as the solutions proposed to overcome those problems are discussed.
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Brym, Szczepan. "Comparison IR spectra of alanine CH3CH(NH2)COOH and alanine CD3CH(NH2)COOH." Journal of Physics: Conference Series 810 (February 2017): 012026. http://dx.doi.org/10.1088/1742-6596/810/1/012026.

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Bell, Jimmy D., Judith C. C. Brown, Peter J. Sadler, Andrew F. MacLeod, Peter H. Sönksen, Robin D. Hughes, and Roger Williams. "High resolution proton nuclear magnetic resonance studies of human cerebrospinal fluid." Clinical Science 72, no. 5 (May 1, 1987): 563–70. http://dx.doi.org/10.1042/cs0720563.

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1. One- and two-dimensional (correlated shift spectroscopy) high resolution proton n.m.r. spectra of human cerebrospinal fluid (CSF) are reported. The merits of water suppression by freeze drying or irradiation, and spectral simplification by spin-echo methods, are discussed. 2. Well-resolved resonances for a range of low molecular weight metabolites such as lactate, 3-d-hydroxybutyrate, alanine, acetate, citrate, glucose, valine and formate were observed. Resonances for glutamine were observed only from freeze dried samples. Concentrations determined by n.m.r. were in reasonable agreement with those from conventional methods. 3. The n.m.r. spectra of CSF were related to the clinical conditions of the subjects. No resonances for citrate were present in spectra of CSF from subjects (three infants) with bacterial meningitis; high lactate and lowered glucose levels were observed. Strong resonances for glucose and glycine were observed for mildly diabetic subjects. Both the aromatic and the aliphatic regions of the CSF spectra from subjects suffering from liver failure contained distinctive features characteristic for hepatic coma: intense resonances for lactate, alanine, valine, methionine, tyrosine, phenylalanine and histidine. In some cases guanine was also present, which does not appear to have been reported previously. The two-dimensional spectrum suggested the presence of abnormally high levels of a number of endogenous metabolites. Such assignments were not possible using one-dimensional spectra alone because of signal overlap.
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Gou, Gao Zhang, Bo Zhou, Ling Shi, Xian Lan Chen, Na Wu, and Wei Liu. "Synthesis, Spectroscopic Properties of Bis-Boc-L-Alanine Modified 1,8-Naphthyridine Ligand Induced by Hg2+." Advanced Materials Research 1089 (January 2015): 121–24. http://dx.doi.org/10.4028/www.scientific.net/amr.1089.121.

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One Bis-Boc-L-alanine-1,8-naphthyridine ligand containing amino acid by amido bond named 2,7-Bis-Boc-L-alanine-1,8-naphthyridine (L1) was synthesized and characterized. And there absorption and fluorescence spectra in methanol is presented. It exhibits electronic absorption spectra with λmax at about 340 nm, which can be tentatively assigned to π→π* transition. The emission spectra of L1 in CH3OH shows a mirror symmetry peak with λmax at about 375 nm. Then, the comprehensive study of spectroscopic properties upon titration of L1 with heavy metal ions as ion source in CH3OH was investigated.
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Belo, E. A., J. A. Lima, P. T. C. Freire, F. E. A. Melo, J. Mendes Filho, H. N. Bordallo, and A. Polian. "High-pressure Raman spectra of racemate dl-alanine crystals." Vibrational Spectroscopy 54, no. 2 (November 2010): 107–11. http://dx.doi.org/10.1016/j.vibspec.2010.03.016.

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Gonçalves, R. O., P. T. C. Freire, H. N. Bordallo, J. A. Lima, F. E. A. Melo, J. Mendes Filho, D. N. Argyriou, and R. J. C. Lima. "High-pressure Raman spectra of deuterated L-alanine crystal." Journal of Raman Spectroscopy 40, no. 8 (August 2009): 958–63. http://dx.doi.org/10.1002/jrs.2209.

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Lima, J. A., P. T. C. Freire, F. E. A. Melo, J. Mendes Filho, G. P. De Sousa, R. J. C. Lima, P. F. Façanha Filho, and H. N. Bordallo. "Low-temperature Raman spectra of racemate DL -Alanine crystals." Journal of Raman Spectroscopy 41, no. 7 (October 12, 2009): 808–13. http://dx.doi.org/10.1002/jrs.2507.

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Dissertations / Theses on the topic "Alanine Spectra"

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Smith, Joshua Dee. "Verifying Molecular Dynamics Using Dielectric Spectroscopy." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4221.

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The electrical properties of proteins in solution are important for their structure and function. Computational biophysics studies of proteins need accurate parameters to ensure that numerical simulations match physical reality. Past work in this eld has compared the electrical properties of proteins obtained from dielectric spectroscopy to numerical simulations of proteins in water with adjustment of pKa values to try to capture the inevitable changes in electrical conformation that will occur in a complex structure such as a folded protein. However, fundamental veri cation of the charge parameters of the amino acid building blocks in common molecular dynamics software packages with electrical experiments needs to be performed to have increased con dence in the results from numerical simulations. The aim of this thesis is to start from a fundamental building block, the single amino acid alanine, and to compare numerical simulations of this amino acid in water using parameters from commonly used charge structures in CHARMM, GROMOS, and OPLS, with electrical parameters obtained from dielectric spectroscopy experiments in the GHz range. To this end, multiple molecular dynamics simulations were performed to accurately determine how these different charge structures yield different dielectric increments. Additionally, a commercial RF dielectric measurement probe was modi ed to perform measurements on solutions containing alanine at different concentrations. Using regression, the dielectric increment of alanine is readily determined and compared with the numerical simulations. The results indicate that the CHARMM and OPLS parameters seem to adequately capture the charge con guration of alanine in solution, while the GROMOS parameters produce a dielectric increment but do not seem to adequately capture the charge con guration of alanine in solution. These studies lay the foundation for future studies of additional amino acids in solution as well as a stepping stone for larger simulations of the electrical properties of fully solvated proteins in solution.
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RODRIGUES, JUNIOR ORLANDO. "Desenvolvimento de um programa computacional para o tratamento de sinais obtidos pela Ressonancia Paramagnetica Eletronica na dosimetria de doses altas." reponame:Repositório Institucional do IPEN, 2003. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11145.

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Carniato, Denis. "Nouveaux inhibiteurs de l'alanine racemase : les acides α-aminophosphoniques β-fonctionnalisés." Paris 6, 1986. http://www.theses.fr/1986PA066029.

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L'objectif de ce travail a été de concevoir, de synthétiser et d'évaluer les molécules polyfonctionnelles susceptibles d'inhiber spécifiquement deux enzymes de la biosynthèse du peptidoglycane, constituant essentiel de la paroi bactérienne: l'alanine racemase et la d-alanimne: d-alanine ligase. Leur inhibition devrait conduire à la formation d'une paroi altérée, ce qui doit rendre le microorganisme non viable. Les molécules synthétisées, basées sur le concept d'inhibiteurs irréversibles de type "substrats suicides", sont des acides α-aminophosphoniques et phosphiniques β-fonctionnalisés. Ils se sont avérés être de bons inhibiteurs compétitifs des enzymes de Pseudomonas aeruginosa (Gram-) et de streptococcus faecalis (Gram+), mais aucune irréversibilité n'a pu être observée. Cette étude a mis en évidence des incertitudes quant au mécanisme d'inhibition de l'alanine racemase par les acides α-aminophosphoniques.
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Book chapters on the topic "Alanine Spectra"

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Iakovidis, Akis, and Nick Hadjiliadis. "IR-Raman and 1H NMR Spectra of Some Amino Acid Chelates of the Type cis-[(NH3)2Pt(amac)](NO3), Where amac is the Anions of Glycine, L-Alanine. L-Aminobutyric Acid, L-Valine And L- Norvaline and of Ternary Complexes of the Type cis- [(NH3)2Pt(nucl)(amac)](NO3), Where nucl-9-Methylguanine (9- MeG), 1-Methylcytosine (1-MeC)." In Fifth International Conference on the Spectroscopy of Biological Molecules, 181–82. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1934-4_67.

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Buchanan, Ruaridh, and Armine Sefton. "Mechanism of Action of Antimicrobial Agents." In Tutorial Topics in Infection for the Combined Infection Training Programme. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198801740.003.0053.

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Antibacterial and antifungal agents aim to kill pathogens, or at the very least incapacitate them. To achieve this aim these agents must have a reasonable degree of toxicity at the cellular level. If this toxicity was equally manifest against all cell types then the drugs would be unusable in patients as the side effect profile would be unacceptably severe. Selective toxicity, whereby the agents are orders of magnitude more toxic to bacteria or fungi than human cells, allows for the safe and effective administration of these agents to patients. There are a number of different mechanisms by which an antimicrobial agent can yield selective toxicity: ● Target a cellular structure that exists only in bacteria/fungi—e.g. the cell wall; ● Target a cellular structure that has a significantly different structure in bacteria/ fungi— e.g. the ribosome; the fungal cell membrane; ● Target cellular enzymes that are significantly different in bacteria/fungi e.g. topoisomerase; ● Target a synthetic pathway that exists only in bacteria e.g. folate synthesis. Broadly, antibacterial drugs can be divided into the following categories: ● Agents that target the cell wall; ● Agents that target the cell membrane; ● Agents that inhibit protein synthesis; ● Agents that inhibit DNA replication/ transcription of RNA; ● Agents that target folate synthesis; ● Agents that directly damage intracellular structures. The cell wall is unique to bacteria, and therefore an ideal target. Disrupting the complex cross-linking process required to produce the cell wall leads to loss of bacterial cell integrity and therefore to cell death. The following classes of antibiotics target the cell wall: The first class to be discovered, and still in many cases the most effective, incorporates the four-membered beta-lactam ring—its homology to d-alanyl-d-alanine allows beta-lactam-containing compounds to bind to cell wall peptidoglycans and act as chain terminators. The beta-lactam ring is fused to a five-membered sulphur-containing ring. Variations in side chains account for the differing pharmacokinetics and spectra of action of the different compounds—for example, the addition of an amino group to benzylpenicillin produces ampicillin.
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Asahi, Toru, Masahito Tanaka, Kenta Nakagawa, Yukana Terasawa, Kazuhiko Ishikawa, Akifumi Takanabe, Hideko Koshima, and Bart Kahr. "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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Conference papers on the topic "Alanine Spectra"

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Sweetlin, M. Daniel, P. Selvarajan, S. Perumal, S. Ramalingom, P. Predeep, Mrinal Thakur, and M. K. Ravi Varma. "Optical and Spectral Studies on β Alanine Metal Halide Hybrid Crystals." In OPTICS: PHENOMENA, MATERIALS, DEVICES, AND CHARACTERIZATION: OPTICS 2011: International Conference on Light. AIP, 2011. http://dx.doi.org/10.1063/1.3646798.

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Redrothu, Hanumantharao, S. Kalainathan, and G. Bhagavannarayana. "Growth, spectral and crystallization perfection studies of semi organic non linear optical crystal - L-alanine lithium chloride." In SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4710496.

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