INVESTIGATING ELECTRONIC AND STRUCTURAL CHANGES IMPOSED BY ZWITTERIONIC PARING IN MODEL PEPTIDE SYSTEMS USING IR-UV-IR TRIPLE RESONANCE SPECTROSCOPY

2018 ◽  
Author(s):  
Christopher Harrilal ◽  
Timothy Zwier ◽  
Scott McLuckey ◽  
Anthony Pitts-McCoy
Keyword(s):  
Structural Changes ◽  
Resonance Spectroscopy ◽  
Triple Resonance ◽  
Model Peptide

scholarly journals The Relationship between the Level of Anterior Cingulate Cortex Metabolites, Brain-Periphery Redox Imbalance, and the Clinical State of Patients with Schizophrenia and Personality Disorders

Biomolecules ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1272
Author(s):  
Amira Bryll ◽  
Wirginia Krzyściak ◽  
Paulina Karcz ◽  
Natalia Śmierciak ◽  
Tamas Kozicz ◽  
...  
Keyword(s):  
Personality Disorders ◽  
Structural Changes ◽  
Clinical Symptoms ◽  
Anterior Cingulate ◽  
Clinical State ◽  
Antioxidant Systems ◽  
Resonance Spectroscopy ◽  
Redox Imbalance ◽  
The Relationship ◽  
The Brain

Schizophrenia is a complex mental disorder whose course varies with periods of deterioration and symptomatic improvement without diagnosis and treatment specific for the disease. So far, it has not been possible to clearly define what kinds of functional and structural changes are responsible for the onset or recurrence of acute psychotic decompensation in the course of schizophrenia, and to what extent personality disorders may precede the appearance of the appropriate symptoms. The work combines magnetic resonance spectroscopy imaging with clinical evaluation and laboratory tests to determine the likely pathway of schizophrenia development by identifying peripheral cerebral biomarkers compared to personality disorders. The relationship between the level of metabolites in the brain, the clinical status of patients according to International Statistical Classification of Diseases and Related Health Problems, 10th Revision ICD-10, duration of untreated psychosis (DUP), and biochemical indices related to redox balance (malondialdehyde), the efficiency of antioxidant systems (FRAP), and bioenergetic metabolism of mitochondria, were investigated. There was a reduction in the level of brain N-acetyl-aspartate and glutamate in the anterior cingulate gyrus of patients with schisophrenia compared to the other groups that seems more to reflect a biological etiopathological factor of psychosis. Decreased activity of brain metabolites correlated with increased peripheral oxidative stress (increased malondialdehyde MDA) associated with decreased efficiency of antioxidant systems (FRAP) and the breakdown of clinical symptoms in patients with schizophrenia in the course of psychotic decompensation compared to other groups. The period of untreated psychosis correlated negatively with glucose value in the brain of people with schizophrenia, and positively with choline level. The demonstrated differences between two psychiatric units, such as schizophrenia and personality disorders in relation to healthy people, may be used to improve the diagnosis and prognosis of schizophrenia compared to other heterogenous psychopathology in the future. The collapse of clinical symptoms of patients with schizophrenia in the course of psychotic decompensation may be associated with the occurrence of specific schizotypes, the determination of which is possible by determining common relationships between changes in metabolic activity of particular brain structures and peripheral parameters, which may be an important biological etiopathological factor of psychosis. Markers of peripheral redox imbalance associated with disturbed bioenergy metabolism in the brain may provide specific biological factors of psychosis however, they need to be confirmed in further studies.

XRD investigation of thermal degradation of some gamma-irradiated polyethylene terephthalate samples

2019 ◽  
Vol 33 (12) ◽  
pp. 1950111 ◽  
Author(s):  
Mihai Todica ◽  
Zoltan Kovacs-Krauss ◽  
Carmen Niculaescu ◽  
Marieta Mureşan-Pop
Keyword(s):  
Thermal Treatment ◽  
Polyethylene Terephthalate ◽  
Structural Changes ◽  
Diffraction Method ◽  
Resonance Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After ◽  
Gamma Irradiated ◽  
Different Doses

The modification of local structure of some commercial polyethylene terephthalate (PET) samples, gamma irradiated at different doses, was investigated by X-ray diffraction method before and after thermal treatment. Before the thermal treatment, the samples exposed to different doses of gamma radiations, does not show noticeable structural changes. However, the gamma exposure affects the thermal behavior of samples submitted to melting–cooling process. These modifications have been highlighted by X-ray diffraction, and confirmed also by thermal analysis and electron spin resonance spectroscopy.

Radicals in solution studied by endor and triple resonance spectroscopy

1982 ◽  
Vol 87 (4) ◽  
pp. 171-208 ◽  
Author(s):  
Klaus Möbius ◽  
Martin Plato ◽  
Wolfgang Lubitz
Keyword(s):  
Resonance Spectroscopy ◽  
Triple Resonance

NMR spectroscopy: a multifaceted approach to macromolecular structure

2000 ◽  
Vol 33 (1) ◽  
pp. 29-65 ◽  
Author(s):  
Ann E. Ferentz ◽  
Gerhard Wagner
Keyword(s):  
Nmr Spectroscopy ◽  
Structure Determination ◽  
Solution Structure ◽  
Residual Dipolar Couplings ◽  
Complete Solution ◽  
Protein Structures ◽  
Sequential Assignment ◽  
Resonance Spectroscopy ◽  
Triple Resonance ◽  
Membrane Bound

1. Introduction 292. Landmarks in NMR of macromolecules 322.1 Protein structures and methods development 322.1.1 Sequential assignment method 322.1.2 Triple-resonance experiments 342.1.3 Structures of large proteins 362.2 Protein–nucleic acid complexes 372.3 RNA structures 382.4 Membrane-bound systems 393. NMR spectroscopy today 403.1 State-of-the-art structure determination 413.2 New methods 443.2.1 Residual dipolar couplings 443.2.2 Direct detection of hydrogen bonds 443.2.3 Spin labeling 453.2.4 Segmental labeling 463.3 Protein complexes 473.4 Mobility studies 503.5 Determination of time-dependent structures 523.6 Drug discovery 534. The future of NMR 544.1 The ease of structure determination 544.2 The ease of making recombinant protein 554.3 Post-translationally modified proteins 554.4 Approaches to large and/or membrane-bound proteins 564.5 NMR in structural genomics 564.6 Synergy of NMR and crystallography in protein structure determination 565. Conclusion 576. Acknowledgements 577. References 57Since the publication of the first complete solution structure of a protein in 1985 (Williamson et al. 1985), tremendous technological advances have brought nuclear magnetic resonance spectroscopy to the forefront of structural biology. Innovations in magnet design, electronics, pulse sequences, data analysis, and computational methods have combined to make NMR an extremely powerful technique for studying biological macromolecules at atomic resolution (Clore & Gronenborn, 1998). Most recently, new labeling and pulse techniques have been developed that push the fundamental line-width limit for resolution in NMR spectroscopy, making it possible to obtain high-field spectra with better resolution than ever before (Dötsch & Wagner, 1998). These methods are facilitating the study of systems of ever-increasing complexity and molecular weight.

Triple-resonance spectroscopy on CH_3OH far-infared laser lines

1985 ◽  
Vol 10 (7) ◽  
pp. 330 ◽  
Author(s):  
N. Ioli ◽  
I. Longo ◽  
A. Moretti ◽  
F. Strumia
Keyword(s):  
Resonance Spectroscopy ◽  
Triple Resonance

EPR, ENDOR, and TRIPLE Resonance Spectroscopy on the Neutral Flavin Radical inEscherichia coliDNA Photolyase†

Biochemistry ◽  
1999 ◽  
Vol 38 (51) ◽  
pp. 16740-16748 ◽  
Author(s):  
Christopher W. M. Kay ◽  
Richard Feicht ◽  
Kristina Schulz ◽  
Peter Sadewater ◽  
Aziz Sancar ◽  
...  
Keyword(s):  
Resonance Spectroscopy ◽  
Triple Resonance

Triple-Resonance Spectroscopy Reveals the Excitation Spectrum of Very Cold, Isomer-Specific Protonated Naphthalene

2013 ◽  
Vol 4 (21) ◽  
pp. 3728-3732 ◽  
Author(s):  
Olha Krechkivska ◽  
Yu Liu ◽  
Kin Long Kelvin Lee ◽  
Klaas Nauta ◽  
Scott H. Kable ◽  
...  
Keyword(s):  
Excitation Spectrum ◽  
Resonance Spectroscopy ◽  
Triple Resonance
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