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Puslapis 1 nuo 1025 rezultatus
Revised conformational assignments and conformational evolution of tyrosine by laser desorption supersonic jet laser spectroscopy.
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The number of conformers and their structures of tyrosine are reassigned on the basis of resonance enhanced multiphoton ionization (REMPI), ultraviolet-ultraviolet hole burning (UV-UV HB), infrared (IR) dip spectra, and quantum chemical calculations. From comparison between REMPI and UV-UV HB
Laser Raman studies on cobrotoxin.
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Laser Raman spectra of cobrotoxin under various conditions have been obtained. Comparison of the spectra of native cobrotoxin in lyophilized form and in aqueous solution indicates that the secondary structures of cobrotoxin are not significantly affected by the removal of the aqueous solvent. On
Transmyocardial laser treatment denervates canine myocardium.
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BACKGROUND
In patients with refractory angina who are not candidates for conventional revascularization, transmyocardial laser treatment reduces angina significantly in the early postoperative period. We hypothesized that transmyocardial laser treatment damages cardiac nerve fibers that convey the
Conformational reduction of DOPA in the gas phase studied by laser desorption supersonic jet laser spectroscopy.
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The conformational reduction in catecholamine neurotransmitters was studied by resonance enhanced multi photon ionization (REMPI), ultraviolet-ultraviolet (UV-UV) hole burning and infrared (IR) dip spectroscopy with applying a laser desorption supersonic jet technique to DOPA, which is one of the
Laser-induced autofluorescence for medical diagnosis.
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The naturally occurring autofluorescence of cells and tissues is based on biomolecules containing intrinsic fluorophores, such as porphyrins, the amino acids tryptophan and tyrosine, and the coenzymes NADH, NADPH, and flavins. Coenzymes fluoresce in the blue/green spectral region (fluorecence
Laser treatment in retinitis pigmentosa-a review
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Retinitis pigmentosa (RP) is a common inherited retinal disease for which effective treatment is not yet known. This review sought to analyze the available medical literature covering the efficacy of different forms of laser treatment for RP in laboratory and clinical trials. The PubMed database was
Nontransmural laser treatment incompletely denervates canine myocardium.
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BACKGROUND
Clinical experience with transmyocardial laser revascularization (TMLR) has reproducibly demonstrated an improvement in angina class. Denervation has been implicated as a mechanism whereby this clinical effect may be achieved. Because endovascular techniques for TMLR are currently under
Ultraviolet and laser Raman investigation of the buried tyrosines in fd phage.
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The tyrosines of the filamentous phage fd have been found to be inaccessible to solvent by pH titration while monitoring the ultraviolet spectrum or the laser Raman spectrum. The uv spectra suggest that the tyrosines do not become deprotonated unless the phage becomes disrupted. One possible
On the choice of laser dyes for use in exciting tyrosine fluorescence decays.
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The choice of laser dyes for exciting tyrosine fluorescence using synchronously pumped cavity-dumped dye laser systems is discussed. Rhodamine 560 was found to be optimal for a system based on an argon-ion pumping laser, whereas rhodamine 575 was preferred using a frequency-doubled Nd:YAG laser.
[Study on laser flash spectroscopy of processes of photoionization of tyrosine: pH effects].
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The processes of photoionization of tyrosine on three different pH value solutions were investigated by 248 nm laser flash photolysis. The results showed that the processes of photoionization of tyrosine were affected by pH value of the solution. With pH value increasing, the molecule number of
Mapping sites of tyrosine nitration by matrix-assisted laser desorption/ionization mass spectrometry.
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Protein tyrosine nitration is an important part of nitric oxide biology. This posttranslational modification occurs under normal physiological conditions and is substantially enhanced under various pathological conditions. Studies reveal that protein tyrosine nitration is a dynamic and selective
Larval melanocyte regeneration following laser ablation in zebrafish.
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A method to specifically ablate melanocytes in a genetically tractable organism would facilitate the analysis of melanocyte regeneration and regulation. We have demonstrated that a Q-switched neodymium:yttrium-aluminum-garnet dermatology laser kills larval melanocytes in zebrafish. Following
Conformation of oxytocin studied by laser Raman spectroscopy.
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The peptide backbone conformation and salient structural details of oxytocin were examined by laser Raman spectroscopy. Spectra were obtained in the solid phase, water, 2H2O, and dimethyl sulfoxide solutions. A distinct Amide I band was obtained at 1663 cm-1 for aqueous and deuterated samples and
Laser Raman spectroscopy of snake venom neurotoxins: conformation.
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Laser Raman spectra of neurotoxins of Pelamis platurus (yellow-bellied sea snake) and Laticauda semifasciata (broad-banded blue sea snake) were investigated. The amide I band appeared at 1672 cm-1 for both toxins, which presents an indication of anti-parallel beta structure. Since this agrees well
Laser Raman spectroscopy of calf bone Gla protein.
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The Raman spectra of solid calf bone Gla protein in its native state, decarboxylated, with reduced disulfide bond, and as the calcium salt have been obtained. The amide I and III bands are consistent with the presence of alpha-helical, antiparallel beta-sheet, and random-coil regions in all four
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