scholarly journals Worthwhile Relevance of Infrared Spectroscopy in Characterization of Samples and Concept of Infrared Spectroscopy-Based Synchrotron Radiation

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Ayodele Temidayo Odularu

The study explores the nitty-gritty of infrared spectroscopy. Firstly, the review gives a concise history of infrared discovery and its location in the electromagnetic spectrum. Secondly, the infrared spectroscopy is reported for its mechanism, principles, sample preparation, and application for absence and presence of functional groups determination in both ligands and coordination compounds. Thirdly, it helps in purity determination of unknown samples. Additional studies regarding this study entail infrared spectroscopy-based synchrotron radiation. It serves as a giant microscope to give detailed information of samples under investigation compared to the conventional infrared instrument. Infrared will continue to be useful to both chemical and pharmaceutical industries, in order to make chemical products and manufactured drugs put on wholesome integrity.

2008 ◽  
Vol 33 (4) ◽  
pp. 61-68 ◽  
Author(s):  
C. T. de Carvalho ◽  
A. B. Siqueira ◽  
E. Y. Ionashiro ◽  
M. Pivatto ◽  
M. Ionashiro

The 2-methoxycinnamylidenepyruvic acid (2-MeO-HCP) was synthesized and characterized for nuclear magnetic resonance (¹H and 13C NMR), mass spectrometry (MS), Infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). The application of DSC for purity determination is well documented in literature and is used in the analysis of pure organic compounds. The molecular geometry and vibrational frequencies of 2-MeO-HCP have been calculated.


2018 ◽  
pp. 8
Author(s):  
Sverre Raffnsøe ◽  
Morten Thaning ◽  
Marius Gudmand-Høyer

This essay argues that what makes Michel Foucault’s oeuvre not only stand apart but also cohere is an assiduous philosophical practice taking the form of an ongoing yet concrete self-modification in the medium of thought. Part I gives an account of three essential aspects of Foucault’s conception of philosophical activity. Beginning with his famous characterization of philosophy in terms of ascēsis, it moves on to articulate his characterization of philosophical practice as a distinct form of meditation, differing from both Cartesian meditation and Hegelian meditation, as it aims to stand vigil for the day to come and operates as a preface to transgression. Part II begins the articulation of crucial traits left implicit in this understanding of philosophy by turning to Foucault’s in-depth investigation of philosophy in Antiquity during his lectures at the Collège de France in the 1980s. First, it develops how philosophy here begins to constitute and distinguish itself by establishing itself as an activity that has a privileged relationship to truth and truth-telling as an unremitting, existentially determining challenge for the philosopher. Further, it instantiates how Platonism elaborates the need for a sustained ‘auto-ascetic’ ethical non-compliant differentiation as the condition of possibility for accessing and stating truth, and then describes how the assertion of an ethical differentiation and attitude in Cynicism takes the form of an insistent combat for another world in this world. Finally, it underlines how the ethical-practical philosophical work upon oneself in Antiquity is developed in an ongoing critical and political exchange with others. Part III indicates how ethical differentiation according to Foucault remains an essential precondition for the practice of philosophy and is further developed in the modern age. This is particularly perspicuous in Kant’s determination of the Enlightenment, in the attitude of modernity exemplified by Baudelaire, and in the history of revolt since the beginning of early Modernity. On this background, Part IV develops how philosophy as an ongoing meditative practice of self-modification leads to an affirmative critique, confirming the virtuality of this world in order to investigate the potentiality in the examined. In this manner, the essay presents Foucault’s philosophical practice as well as an outline of the history of ideas of a seemingly alternate, yet still agenda-setting conception of philosophical practice today.


2020 ◽  
Author(s):  
Peralta Teresa ◽  
Bastías Carla ◽  
Camila Beltran-Ortiz ◽  
Durán Magdalena ◽  
Ramos Verónica ◽  
...  

Abstract Introduction. Histamine intolerance (HIT) is a pathology with an estimated prevalence of 1% in which there is an imbalance between the intake of histamine via the digestive tract and the body's ability to degrade it. This results in an excessive accumulation of histamine that determines the appearance of gastrointestinal, skin, respiratory and neurological symptoms. The enzyme responsible for degrading histamine in the extracellular space is diamine oxidase (DAO); therefore, HIT is caused due to a deficit in the concentration and/or in the activity of this enzyme. Because histamine is the main mediator of the classic symptoms of IgE-mediated allergic reactions, it is difficult to differentiate a true allergy from HIT since it has basically the same clinical manifestations. Objectives. The objective of this study was to perform a clinical characterization of patients with HIT and to determine the usefulness of quantifying serum DAO concentration in the diagnosis of HIT. Method: Twenty-two patients over the age of 18 with a history of histamine intolerance were recruited, in whom IgE-mediated food allergy was ruled out, and 22 healthy patients. Both groups were surveyed and serum DAO concentration was determined. Results: Middle-aged women predominated in the population with HIT. They described a wide variety of symptoms, with a dominance of abdominal pain, bloating, diarrhea, flushing, urticaria, itching, headache and dysmenorrhea. When comparing the average serum DAO concentration in the population with HIT (10.686 U/ml) with the average obtained in the control population (20.664 U/ml), there was a significant difference (p < 0.003). Conclusion. The determination of serum DAO concentration is a useful tool for the diagnosis of HIT.


2017 ◽  
Vol 13 ◽  
pp. 1145-1167 ◽  
Author(s):  
Serge Pérez ◽  
Daniele de Sanctis

Synchrotron radiation is the most versatile way to explore biological materials in different states: monocrystalline, polycrystalline, solution, colloids and multiscale architectures. Steady improvements in instrumentation have made synchrotrons the most flexible intense X-ray source. The wide range of applications of synchrotron radiation is commensurate with the structural diversity and complexity of the molecules and macromolecules that form the collection of substrates investigated by glycoscience. The present review illustrates how synchrotron-based experiments have contributed to our understanding in the field of structural glycobiology. Structural characterization of protein–carbohydrate interactions of the families of most glycan-interacting proteins (including glycosyl transferases and hydrolases, lectins, antibodies and GAG-binding proteins) are presented. Examples concerned with glycolipids and colloids are also covered as well as some dealing with the structures and multiscale architectures of polysaccharides. Insights into the kinetics of catalytic events observed in the crystalline state are also presented as well as some aspects of structure determination of protein in solution.


2013 ◽  
Vol 32 (1) ◽  
Author(s):  
Witold Paweł Alexandrowicz

AbstractThe localities of Late Holocene fluvial sediments in the Podhale basin were subjected to malacological analysis. Two types of mollusc communities were found in these formations. The first type is characterized by a high proportion of species typical of open environments such as the zones of wide valleys. The predomination of shade-loving taxa is typical of the second type which is mainly associated with narrow, V-shaped type valleys. Malacological analysis allowed characterization of these communities and reconstruction of environmental changes over the last few hundred years. Particular attention was paid to the reconstruction of the history of human settlement in the Podhale region and its impact on the transformation of the environment. This impact resulted in massive deforestation and the introduction of wide-scale farming and pastoral practices. Application of this malacological analysis enabled the determination of the anthropogenic pressures, and changes in their intensity, over the last few hundred years.


2021 ◽  
Vol 26 (3(79)) ◽  
pp. 45-54
Author(s):  
T. V. Koksharova ◽  
T. V. Mandzii ◽  
A. Yu. Kovalyov ◽  
D. V. Kramarenko ◽  
T. Yu. Brazhnik ◽  
...  

Complexes of copper(II), nickel(II), cobalt(III), and zinc(II) maleates with thiosemicarbazide were synthesized. The resulting compounds were characterized by the elemental analysis data, infrared spectroscopy, diffuse reflectance spectroscopy, and thermogravimetry.


1992 ◽  
Vol 271 ◽  
Author(s):  
Peter W. Lednor ◽  
Rene De Ruiter ◽  
Kees A. Emeis

ABSTRACTHigh surface area silicon oxynitrides have been prepared by nitrida- tion of silica with ammonia. Characterization by Fourier-transform infrared spectroscopy has allowed quantitative determination of hydroxyl, amido and imido groups. Data obtained by X-ray photoelectron spectroscopy show that the nitrogen is well distributed in the surface of the materials.


2014 ◽  
Vol 277-278 ◽  
pp. 130-186 ◽  
Author(s):  
Claudio Garino ◽  
Elisa Borfecchia ◽  
Roberto Gobetto ◽  
Jeroen A. van Bokhoven ◽  
Carlo Lamberti

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