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Artículos de revistas sobre el tema "Spectroscopy"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 21 de diciembre de 2024

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1

SAKAI, Kiyomi y Shigeru FUJITA. "Spectroscopic instruments. II. Interferometric spectroscopy." Journal of the Spectroscopical Society of Japan 34, n.º 2 (1985): 122–39. http://dx.doi.org/10.5111/bunkou.34.122.

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2

Catala, Claude, Jacques Baudrand, Torsten Böhm y Bernard H. Foing. "The Musicos Project: Multi-Site Continuous Spectroscopy". International Astronomical Union Colloquium 137 (1993): 662–64. http://dx.doi.org/10.1017/s0252921100018601.

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Many scientific programs, most of them linked to stellar physics (such as asteroseismology, stellar rotational modulation, surface structures, Doppler imaging, Zeeman-Doppler imaging, variable stellar winds) require a continuous spectroscopic coverage during several days.MUSICOS (for MUlti-SIte COntinuous Spectroscopy) is an international project for setting up a network of high resolution spectrometers coupled to telescopes of the 2m class, well distributed around the world, and partly dedicated to continuous spectroscopy.The strategy to reach this objective was defined during two workshops organized at Paris-Meudon Observatory in 1988 and 1990, and consists of three steps: 1) organize multi-site spectroscopie campaigns using resident instruments on various telescopes around the world and transportable fiber-fed spectrographs where adequate spectroscopie equipment is not available; 2) design and develop a cross-dispersed echelle spectrograph, well suited for the scientific programs that require multi-site observations; 3) propose this MUSICOS spectrograph for duplication at several collaborating sites.

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3

Allamandola, L. J. "Grain Spectroscopy". Symposium - International Astronomical Union 150 (1992): 65–72. http://dx.doi.org/10.1017/s0074180900089725.

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Our fundamental knowledge of interstellar grain composition has grown substantially during the past two decades thanks to significant advances in two areas: astronomical infrared spectroscopy and laboratory astrophysics. The opening of the mid-infrared, the spectral range from 4000-400 cm−1 (2.5-25 μm), to spectroscopic study has been critical to this progress because spectroscopy in this region reveals more about a material's molecular composition and structure than any other physical property.

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4

Cygan, A., K. Bielska, D. Charczun, G. Kowzan, A. Nishiyama, P. Wcisło, S. Wójtewicz et al. "Pure frequency-based dispersive spectroscopy". Journal of Physics: Conference Series 2889, n.º 1 (1 de noviembre de 2024): 012061. http://dx.doi.org/10.1088/1742-6596/2889/1/012061.

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Abstract Dispersion spectroscopy based on frequency measurement of the high finesse optical cavity mode shifts induced by the presence of a gas medium with absorption resonances is an attractive alternative to standard absorptive spectroscopy. The main advantage of such pure frequency-based dispersive spectroscopy technique is the unique combination of sensitivity and accuracy. High sensitivity is ensured by high finesse optical cavities providing extremely long effective optical paths. On the other hand, high accuracy is provided by frequency measurement cavity mode shift. This makes this technique free from systematic errors coming from the non-linearity of light intensity measurements, which is one of the limiting factors in typical absorptive spectroscopy. We review several realizations of dispersive spectroscopy in high finesse optical cavities from Doppler-free to broadband. These techniques are especially useful for studying weak molecular transitions applicable in testing fundamental physics, gas metrology, spectroscopic thermometry, and a new generation of spectroscopic databases.

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5

Crocombe, Richard A. "Portable Spectroscopy". Applied Spectroscopy 72, n.º 12 (18 de octubre de 2018): 1701–51. http://dx.doi.org/10.1177/0003702818809719.

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Until very recently, handheld spectrometers were the domain of major analytical and security instrument companies, with turnkey analyzers using spectroscopic techniques from X-ray fluorescence (XRF) for elemental analysis (metals), to Raman, mid-infrared, and near-infrared (NIR) for molecular analysis (mostly organics). However, the past few years have seen rapid changes in this landscape with the introduction of handheld laser-induced breakdown spectroscopy (LIBS), smartphone spectroscopy focusing on medical diagnostics for low-resource areas, commercial engines that a variety of companies can build up into products, hyphenated or dual technology instruments, low-cost visible-shortwave NIR instruments selling directly to the public, and, most recently, portable hyperspectral imaging instruments. Successful handheld instruments are designed to give answers to non-scientist operators; therefore, their developers have put extensive resources into reliable identification algorithms, spectroscopic libraries or databases, and qualitative and quantitative calibrations. As spectroscopic instruments become smaller and lower cost, “engines” have emerged, leading to the possibility of being incorporated in consumer devices and smart appliances, part of the Internet of Things (IOT). This review outlines the technologies used in portable spectroscopy, discusses their applications, both qualitative and quantitative, and how instrument developers and vendors have approached giving actionable answers to non-scientists. It outlines concerns on crowdsourced data, especially for heterogeneous samples, and finally looks towards the future in areas like IOT, emerging technologies for instruments, and portable hyphenated and hyperspectral instruments.

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6

Pedrotti, K. D. "Extinction spectroscopy: A novel laser spectroscopic technique". Optics Communications 62, n.º 4 (mayo de 1987): 250–55. http://dx.doi.org/10.1016/0030-4018(87)90167-2.

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7

Borba, A., J. P. Vareda, L. Durães, A. Portugal y P. N. Simões. "Spectroscopic characterization of silica aerogels prepared using several precursors – effect on the formation of molecular clusters". New Journal of Chemistry 41, n.º 14 (2017): 6742–59. http://dx.doi.org/10.1039/c7nj01082f.

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8

Pandiselvam, Ravi, Rathnakumar Kaavya, Sergio I. Martinez Monteagudo, V. Divya, Surangna Jain, Anandu Chandra Khanashyam, Anjineyulu Kothakota et al. "Contemporary Developments and Emerging Trends in the Application of Spectroscopy Techniques: A Particular Reference to Coconut (Cocos nucifera L.)". Molecules 27, n.º 10 (19 de mayo de 2022): 3250. http://dx.doi.org/10.3390/molecules27103250.

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The number of food frauds in coconut-based products is increasing due to higher consumer demands for these products. Rising health consciousness, public awareness and increased concerns about food safety and quality have made authorities and various other certifying agencies focus more on the authentication of coconut products. As the conventional techniques for determining the quality attributes of coconut are destructive and time-consuming, non-destructive testing methods which are accurate, rapid, and easy to perform with no detrimental sampling methods are currently gaining importance. Spectroscopic methods such as nuclear magnetic resonance (NMR), infrared (IR)spectroscopy, mid-infrared (MIR)spectroscopy, near-infrared (NIR) spectroscopy, ultraviolet-visible (UV-VIS) spectroscopy, fluorescence spectroscopy, Fourier-transform infrared spectroscopy (FTIR), and Raman spectroscopy (RS) are gaining in importance for determining the oxidative stability of coconut oil, the adulteration of oils, and the detection of harmful additives, pathogens, and toxins in coconut products and are also employed in deducing the interactions in food constituents, and microbial contaminations. The objective of this review is to provide a comprehensive analysis on the various spectroscopic techniques along with different chemometric approaches for the successful authentication and quality determination of coconut products. The manuscript was prepared by analyzing and compiling the articles that were collected from various databases such as PubMed, Google Scholar, Scopus and ScienceDirect. The spectroscopic techniques in combination with chemometrics were shown to be successful in the authentication of coconut products. RS and NMR spectroscopy techniques proved their utility and accuracy in assessing the changes in coconut oil’s chemical and viscosity profile. FTIR spectroscopy was successfully utilized to analyze the oxidation levels and determine the authenticity of coconut oils. An FT-NIR-based analysis of various coconut samples confirmed the acceptable levels of accuracy in prediction. These non-destructive methods of spectroscopy offer a broad spectrum of applications in food processing industries to detect adulterants. Moreover, the combined chemometrics and spectroscopy detection method is a versatile and accurate measurement for adulterant identification.

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9

Sulyok, A. y G. Gergely. "Electron spectroscopic studies on FeNi alloys using ionization loss spectroscopy (ILS), Auger electron spectroscopy (AES) and elastic peak electron spectroscopy (EPES)". Surface Science 213, n.º 2-3 (abril de 1989): 327–35. http://dx.doi.org/10.1016/0039-6028(89)90294-x.

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10

Sulyok, A. y G. Gergely. "Electron spectroscopic studies on FeNi alloys using ionization loss spectroscopy (ILS), Auger Electron Spectroscopy (AES) and Elastic Peak Electron Spectroscopy (EPES)". Surface Science Letters 213, n.º 2-3 (abril de 1989): A222. http://dx.doi.org/10.1016/0167-2584(89)90459-3.

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11

Sharma, Shubham, Swarna Jaiswal, Brendan Duffy y Amit Jaiswal. "Nanostructured Materials for Food Applications: Spectroscopy, Microscopy and Physical Properties". Bioengineering 6, n.º 1 (19 de marzo de 2019): 26. http://dx.doi.org/10.3390/bioengineering6010026.

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Nanotechnology deals with matter of atomic or molecular scale. Other factors that define the character of a nanoparticle are its physical and chemical properties, such as surface area, surface charge, hydrophobicity of the surface, thermal stability of the nanoparticle and its antimicrobial activity. A nanoparticle is usually characterized by using microscopic and spectroscopic techniques. Microscopic techniques are used to characterise the size, shape and location of the nanoparticle by producing an image of the individual nanoparticle. Several techniques, such as scanning electron microscopy (SEM), transmission electron microscopy/high resolution transmission electron microscopy (TEM/HRTEM), atomic force microscopy (AFM) and scanning tunnelling microscopy (STM) have been developed to observe and characterise the surface and structural properties of nanostructured material. Spectroscopic techniques are used to study the interaction of a nanoparticle with electromagnetic radiations as the function of wavelength, such as Raman spectroscopy, UV–Visible spectroscopy, attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR), dynamic light scattering spectroscopy (DLS), Zeta potential spectroscopy, X-ray photoelectron spectroscopy (XPS) and X-ray photon correlation spectroscopy. Nanostructured materials have a wide application in the food industry as nanofood, nano-encapsulated probiotics, edible nano-coatings and in active and smart packaging.

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12

Ha, Tran, Arnaud Cuisset, Sébastien Payan, Martin Schwell, Yao Té, Linda Tomasini y Yannick Giraud Héraud. "The first Vietnam School of Earth Observation: Atmospheric Remote Sensing and Molecular Spectroscopy". VIETNAM JOURNAL OF EARTH SCIENCES 41, n.º 2 (15 de marzo de 2019): 138–55. http://dx.doi.org/10.15625/0866-7187/41/2/13724.

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In this review paper, we give an introduction to molecular spectroscopy and its relation to atmospheric remote sensing and examples of recent developments in spectroscopic experimental techniques and modelling. Atmospheric retrieval techniques, based on radiative transfer theories and molecular spectroscopy as well as some atmospheric remote sensing missions using spectroscopic techniques are presented.

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13

Nwaboh, Javis Anyangwe, Thibault Desbois, Daniele Romanini, Detlef Schiel y Olav Werhahn. "Molecular Laser Spectroscopy as a Tool for Gas Analysis Applications". International Journal of Spectroscopy 2011 (20 de junio de 2011): 1–12. http://dx.doi.org/10.1155/2011/568913.

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We have used the traceable infrared laser spectrometric amount fraction measurement (TILSAM) method to perform absolute concentration measurements of molecular species using three laser spectroscopic techniques. We report results performed by tunable diode laser absorption spectroscopy (TDLAS), quantum cascade laser absorption spectroscopy (QCLAS), and cavity ring down spectroscopy (CRDS), all based on the TILSAM methodology. The measured results of the different spectroscopic techniques are in agreement with respective gravimetric values, showing that the TILSAM method is feasible with all different techniques. We emphasize the data quality objectives given by traceability issues and uncertainty analyses.

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14

Twieg, D. B., D. J. Meyerhoff, B. Hubesch, K. Roth, D. Sappey-Marinier, M. D. Boska, J. R. Gober, S. Schaefer y M. W. Weiner. "Phosphorus-31 magnetic resonance spectroscopy in humans by spectroscopic imaging: Localized spectroscopy and metabolite imaging". Magnetic Resonance in Medicine 12, n.º 3 (diciembre de 1989): 291–305. http://dx.doi.org/10.1002/mrm.1910120302.

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15

Magalas, Leszek B. y B. M. Darinskii. "Mechanical Spectroscopy and Relaxation Phenomena in Solids". Solid State Phenomena 115 (agosto de 2006): 1–6. http://dx.doi.org/10.4028/www.scientific.net/ssp.115.1.

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Mechanical spectroscopy and relaxation phenomena in solids are briefly discussed from the viewpoint of generalized susceptibility and linear response theory. Comparison of mechanical spectroscopy with other spectroscopic techniques is provided in the endeavour to formulate a multidisciplinary approach to selected relaxation phenomena in solids.

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16

Christensen, Dale, Anja Rüther, Kamila Kochan, David Pérez-Guaita y Bayden Wood. "Whole-Organism Analysis by Vibrational Spectroscopy". Annual Review of Analytical Chemistry 12, n.º 1 (12 de junio de 2019): 89–108. http://dx.doi.org/10.1146/annurev-anchem-061318-115117.

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Vibrational spectroscopy has contributed to the understanding of biological materials for many years. As the technology has advanced, the technique has been brought to bear on the analysis of whole organisms. Here, we discuss advanced and recently developed infrared and Raman spectroscopic instrumentation to whole-organism analysis. We highlight many of the recent contributions made in this relatively new area of spectroscopy, particularly addressing organisms associated with disease with emphasis on diagnosis and treatment. The application of vibrational spectroscopic techniques to entire organisms is still in its infancy, but new developments in imaging and chemometric processing will likely expand in the field in the near future.

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17

Gotts, H. "Characterization of Process Induced Contamination and Residues on Semiconductor Components Via FTIR and Raman Microanalysis". Microscopy and Microanalysis 7, S2 (agosto de 2001): 152–53. http://dx.doi.org/10.1017/s1431927600026830.

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FTIR and Raman microanalysis may be used as a powerful combination to determine the identity, and hence infer the source, of contaminant particles which diminish yields of semiconductor components and devices. The complimentarity of these techniques arises from the underlying spectroscopic selection rules.Vibrational spectroscopic techniques are commonly used to characterize the molecular structure of bulk organic materials. These bulk materials typically represent purified fractions of components which may be further investigated with various classical instrumental techniques such as Differential Scanning Calorimetry (DSC), Nuclear Magnetic Resonance (NMR) spectroscopy, UV-Vis spectroscopy. However, these classical technique may have limited value for the interrogation of small impure particles or materials of limited quantity(ng.).Elemental techniques such as Scanning Electron Microscopy coupled to Energy Dispersive Spectroscopy are enhanced by the specificity of FTIR Microprobe Spectroscopy and Raman Microprobe Spectroscopy which are now used in process laboratories to characterize and identify particulate and thin film residues with the intent of device yield enhancement.

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18

Ortac, Inanc y Feride Severcan. "Spectroscopy of biological nanocrystals". Spectroscopy 21, n.º 1 (2007): 31–41. http://dx.doi.org/10.1155/2007/129283.

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Nanocrystals have gained much interest in recent years, due to their unusual properties allowing interesting applications in physical and biological science. In this literature review, biological nanocrystals are discussed from the spectroscopic point of view. Firstly, the theory behind the outstanding abilities of the nanocrystals is described. Secondly, the spectroscopic properties of biological nanocrystals are mentioned. Lastly, the use of nanocrystals with various spectroscopic applications is reviewed such as biosensor applications with UV–visible and surface plasmon resonance and Raman spectroscopy of biological materials. Finally, a short discussion of infrared nanocrystals and their abilities are included in the review.

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19

Kaczmarek, Katarzyna, Andrzej Leniart, Barbara Lapinska, Slawomira Skrzypek y Monika Lukomska-Szymanska. "Selected Spectroscopic Techniques for Surface Analysis of Dental Materials: A Narrative Review". Materials 14, n.º 10 (17 de mayo de 2021): 2624. http://dx.doi.org/10.3390/ma14102624.

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The presented work focuses on the application of spectroscopic methods, such as Infrared Spectroscopy (IR), Fourier Transform Infrared Spectroscopy (FT-IR), Raman spectroscopy, Ultraviolet and Visible Spectroscopy (UV-Vis), X-ray spectroscopy, and Mass Spectrometry (MS), which are widely employed in the investigation of the surface properties of dental materials. Examples of the research of materials used as tooth fillings, surface preparation in dental prosthetics, cavity preparation methods and fractographic studies of dental implants are also presented. The cited studies show that the above techniques can be valuable tools as they are expanding the research capabilities of materials used in dentistry.

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20

Ridgeway, William K., David P. Millar y James R. Williamson. "The Spectroscopic Basis of Fluorescence Triple Correlation Spectroscopy". Journal of Physical Chemistry B 116, n.º 6 (8 de febrero de 2012): 1908–19. http://dx.doi.org/10.1021/jp208605z.

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21

Ewing, Andrew V. y Sergei G. Kazarian. "Infrared spectroscopy and spectroscopic imaging in forensic science". Analyst 142, n.º 2 (2017): 257–72. http://dx.doi.org/10.1039/c6an02244h.

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22

Baiz, Carlos R., Bartosz Błasiak, Jens Bredenbeck, Minhaeng Cho, Jun-Ho Choi, Steven A. Corcelli, Arend G. Dijkstra et al. "Vibrational Spectroscopic Map, Vibrational Spectroscopy, and Intermolecular Interaction". Chemical Reviews 120, n.º 15 (29 de junio de 2020): 7152–218. http://dx.doi.org/10.1021/acs.chemrev.9b00813.

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23

Švecová, Marie, Vít Novák, Vilém Bartůněk y Martin Člupek. "Lanthanum trilactate: Vibrational spectroscopic study − infrared/Raman spectroscopy". Vibrational Spectroscopy 87 (noviembre de 2016): 123–28. http://dx.doi.org/10.1016/j.vibspec.2016.09.020.

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24

Hlavatsch, Michael, Julian Haas, Robert Stach, Vjekoslav Kokoric, Andrea Teuber, Mehmet Dinc y Boris Mizaikoff. "Infrared Spectroscopy–Quo Vadis?" Applied Sciences 12, n.º 15 (28 de julio de 2022): 7598. http://dx.doi.org/10.3390/app12157598.

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Given the exquisite capability of direct, non-destructive label-free sensing of molecular transitions, IR spectroscopy has become a ubiquitous and versatile analytical tool. IR application scenarios range from industrial manufacturing processes, surveillance tasks and environmental monitoring to elaborate evaluation of (bio)medical samples. Given recent developments in associated fields, IR spectroscopic devices increasingly evolve into reliable and robust tools for quality control purposes, for rapid analysis within at-line, in-line or on-line processes, and even for bed-side monitoring of patient health indicators. With the opportunity to guide light at or within dedicated optical structures, remote sensing as well as high-throughput sensing scenarios are being addressed by appropriate IR methodologies. In the present focused article, selected perspectives on future directions for IR spectroscopic tools and their applications are discussed. These visions are accompanied by a short introduction to the historic development, current trends, and emerging technological opportunities guiding the future path IR spectroscopy may take. Highlighted state-of-the art implementations along with novel concepts enhancing the performance of IR sensors are presented together with cutting-edge developments in related fields that drive IR spectroscopy forward in its role as a versatile analytical technology with a bright past and an even brighter future.

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25

Jansen, Thomas L. C. "Computational spectroscopy of complex systems". Journal of Chemical Physics 155, n.º 17 (7 de noviembre de 2021): 170901. http://dx.doi.org/10.1063/5.0064092.

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Numerous linear and non-linear spectroscopic techniques have been developed to elucidate structural and functional information of complex systems ranging from natural systems, such as proteins and light-harvesting systems, to synthetic systems, such as solar cell materials and light-emitting diodes. The obtained experimental data can be challenging to interpret due to the complexity and potential overlapping spectral signatures. Therefore, computational spectroscopy plays a crucial role in the interpretation and understanding of spectral observables of complex systems. Computational modeling of various spectroscopic techniques has seen significant developments in the past decade, when it comes to the systems that can be addressed, the size and complexity of the sample types, the accuracy of the methods, and the spectroscopic techniques that can be addressed. In this Perspective, I will review the computational spectroscopy methods that have been developed and applied for infrared and visible spectroscopies in the condensed phase. I will discuss some of the questions that this has allowed answering. Finally, I will discuss current and future challenges and how these may be addressed.

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26

Fenn, Michael B., Petros Xanthopoulos, Georgios Pyrgiotakis, Stephen R. Grobmyer, Panos M. Pardalos y Larry L. Hench. "Raman Spectroscopy for Clinical Oncology". Advances in Optical Technologies 2011 (19 de octubre de 2011): 1–20. http://dx.doi.org/10.1155/2011/213783.

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Cancer is one of the leading causes of death throughout the world. Advancements in early and improved diagnosis could help prevent a significant number of these deaths. Raman spectroscopy is a vibrational spectroscopic technique which has received considerable attention recently with regards to applications in clinical oncology. Raman spectroscopy has the potential not only to improve diagnosis of cancer but also to advance the treatment of cancer. A number of studies have investigated Raman spectroscopy for its potential to improve diagnosis and treatment of a wide variety of cancers. In this paper the most recent advances in dispersive Raman spectroscopy, which have demonstrated promising leads to real world application for clinical oncology are reviewed. The application of Raman spectroscopy to breast, brain, skin, cervical, gastrointestinal, oral, and lung cancers is reviewed as well as a special focus on the data analysis techniques, which have been employed in the studies.

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27

Petersen, Marlen, Zhilong Yu y Xiaonan Lu. "Application of Raman Spectroscopic Methods in Food Safety: A Review". Biosensors 11, n.º 6 (8 de junio de 2021): 187. http://dx.doi.org/10.3390/bios11060187.

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Food detection technologies play a vital role in ensuring food safety in the supply chains. Conventional food detection methods for biological, chemical, and physical contaminants are labor-intensive, expensive, time-consuming, and often alter the food samples. These limitations drive the need of the food industry for developing more practical food detection tools that can detect contaminants of all three classes. Raman spectroscopy can offer widespread food safety assessment in a non-destructive, ease-to-operate, sensitive, and rapid manner. Recent advances of Raman spectroscopic methods further improve the detection capabilities of food contaminants, which largely boosts its applications in food safety. In this review, we introduce the basic principles of Raman spectroscopy, surface-enhanced Raman spectroscopy (SERS), and micro-Raman spectroscopy and imaging; summarize the recent progress to detect biological, chemical, and physical hazards in foods; and discuss the limitations and future perspectives of Raman spectroscopic methods for food safety surveillance. This review is aimed to emphasize potential opportunities for applying Raman spectroscopic methods as a promising technique for food safety detection.

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28

FREIBURGER, DANA A. "BUILDING A JAPANESE RESEARCH TRADITION IN PHYSICS: HANTARO NAGAOKA AND THE SPECTROSCOPE1". Nuncius 17, n.º 2 (2002): 673–89. http://dx.doi.org/10.1163/182539102x00171.

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Abstracttitle SUMMARY /title Hantaro Nagaoka (1865-1950) became one the foremost Japanese professors of physics and was notable for a Saturnian model of the atom he first proposed in 1903. However, he later abandoned this model and turned to spectroscopy in order to understand the structure of the atom. Most histories of physics speak well of Nagaoka for his theoretical work on an atomic model, but have largely overlooked Nagaoka's several decades of experimental spectroscopic work. This paper examines Nagaoka's research involving the spectroscope and how it helped to establish a Japanese research tradition in physics.

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29

Li, Shaomin y Liqun Sun. "Natural logarithm wavelength modulation spectroscopy". Chinese Optics Letters 19, n.º 3 (2021): 031201. http://dx.doi.org/10.3788/col202119.031201.

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30

Wenhui Fan, Wenhui Fan. "Broadband terahertz spectroscopy (Invited Paper)". Chinese Optics Letters 9, n.º 11 (2011): 110008–13. http://dx.doi.org/10.3788/col201109.110008.

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31

Chavan, Jotiram K. y Raju M. Patil. "Microwave assisted Synthesis and Characterization of Novel Acylhydrazoneoximes". Research Journal of Chemistry and Environment 27, n.º 12 (5 de noviembre de 2023): 31–34. http://dx.doi.org/10.25303/2712rjce031034.

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The present study deals with microwave assisted synthesis of novel acylhydrazoneoximes using para-substituted isonitrosoacetophenones and terephthalohydrazide. The compounds have been characterized by physicochemical and spectroscopic techniques. TheUV-Visible spectroscopy has been used for electronic excitation to characterize each of these new acylhydrazoneoximes. FTIR spectroscopy is used to conduct the functional group study. 1H and 13C-NMR spectroscopy, mass spectrometry has also been used.

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32

Kim, Hyoung-Geun, Jung-Hwan Ko, Hyun-Ji Oh, Jung-Hwa Kwon, Eun-Ji Oh, Seon M. Oh, Yeong-Geun Lee, Dae Y. Lee y Nam-In Baek. "Tyrosinase Inhibition Activity of Monoterpene Glucosides From Brugmansia arborea Flowers". Natural Product Communications 14, n.º 7 (julio de 2019): 1934578X1986350. http://dx.doi.org/10.1177/1934578x19863503.

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Three monoterpene glucosides were isolated from the flowers of Brugmansia arborea L. using repeated silica gel and octadecyl SiO2 column chromatography. Based on spectroscopic data including 1d-NMR (1H, 13C, and distortionless enhancement by polarization transfer (DEPT)), 2D-NMR (gradient correlation spectroscopy (gCOSY), gradient heteronuclear single quantum coherence (gHSQC), and gradient heteronuclear multiple bond coherence (gHMBC)), Infrared Spectroscophy, and Mass Spectroscophy, the glucosides were identified as citronellol O- β-D-glucopyranoside (1), jasminoside N (2), and jasminoside P (3). The EtOAc ( Brugmansia arborea Flowers ethyl acetate fraction [BAFE]) and n-BuOH ( Brugmansia arborea Flowers n-butanol fraction [BAFB]) fractions showed high inhibition of tyrosinase activity (BAFE: IC50 = 68.0 and BAFB: IC50 = 59.3 μg/mL), and all isolated monoterpenes inhibited tyrosinase activity (1: IC50 = 156.5, 2: IC50 = 198.2, and 3: IC50 = 191.0 μM).

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33

Hsu, Shuo-Hsiu, Ming-Chung Chou, Cheng-Wen Ko, Shu-Shong Hsu, Huey-Shyan Lin, Jui-Hsun Fu, Po-Chin Wang, Huay-Ben Pan y Ping-Hong Lai. "Proton MR spectroscopy in patients with pyogenic brain abscess: MR spectroscopic imaging versus single-voxel spectroscopy". European Journal of Radiology 82, n.º 8 (agosto de 2013): 1299–307. http://dx.doi.org/10.1016/j.ejrad.2013.01.032.

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34

Kharlamova, Marianna V. y Christian Kramberger. "Spectroscopy of Filled Single-Walled Carbon Nanotubes". Nanomaterials 12, n.º 1 (23 de diciembre de 2021): 42. http://dx.doi.org/10.3390/nano12010042.

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Many envisaged applications, such as nanoelectronics, photovoltaics, thermoelectric power generation, light-emission devices, energy storage and biomedicine, necessitate single-walled carbon nanotube (SWCNT) samples with specific uniform electronic properties. The precise investigation of the electronic properties of filled SWCNTs on a qualitative and quantitative level is conducted by optical absorption spectroscopy, Raman spectroscopy, photoemission spectroscopy and X-ray absorption spectroscopy. This review is dedicated to the description of the spectroscopic methods for the analysis of the electronic properties of filled SWCNTs. The basic principle and main features of SWCNTs as well as signatures of doping-induced modifications of the spectra of filled SWCNTs are discussed.

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35

Hildebrandt, Peter. "Vibrational Spectroscopy of Phytochromes". Biomolecules 13, n.º 6 (17 de junio de 2023): 1007. http://dx.doi.org/10.3390/biom13061007.

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Phytochromes are biological photoswitches that translate light into physiological functions. Spectroscopic techniques are essential tools for molecular research into these photoreceptors. This review is directed at summarizing how resonance Raman and IR spectroscopy contributed to an understanding of the structure, dynamics, and reaction mechanism of phytochromes, outlining the substantial experimental and theoretical challenges and describing the strategies to master them. It is shown that the potential of the various vibrational spectroscopic techniques can be most efficiently exploited using integral approaches via a combination of theoretical methods as well as other experimental techniques.

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Weber, Carina, Stefan Pusch, Dieter Schollmeyer, Sascha Münster-Müller, Michael Pütz y Till Opatz. "Characterization of the synthetic cannabinoid MDMB-CHMCZCA". Beilstein Journal of Organic Chemistry 12 (21 de diciembre de 2016): 2808–15. http://dx.doi.org/10.3762/bjoc.12.279.

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The synthetic cannabinoid MDMB-CHMCZCA was characterized by various spectroscopic techniques including NMR spectroscopy and tandem mass spectrometry. The synthetic sample was found to be of S-configuration by VCD spectroscopy and comparison of the data with DFT calculations, while ECD spectroscopy was found to be inconclusive in this case. The enantiomeric purity of samples from test purchases and police seizures was assessed by a self-developed chiral HPLC method.

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37

Egan, R. L. y P. D. Dolan. "Optical Spectroscopy". Acta Radiologica 29, n.º 5 (septiembre de 1988): 497–503. http://dx.doi.org/10.1177/028418518802900501.

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Non-invasive optical spectroscopy consistently delineates compositional and physiologic properties of breast tissues serving as a premammography risk marker for cancer or yielding a high assurance of no such risk. We believe this new non-imaging approach depends on biochemistry of tissues rather than on the macroscopic physical properties involved with most breast imaging modalities. After establishing the procedure as inexpensive, physician independent, simple, requiring only a few minutes and appealing to women, it was carried out in two institutions on 1739 women referred for routine mammography. Of 166 breast biopsies on these women 77 were cancer by histology. An automated computerized analysis of the spectroscopic data yielded a sensitivity of 87 per cent, a specificity of 74 per cent and a negative predictive value of 99 per cent. Optical spectroscopy shows promise in identifying women at a higher risk for developing cancer, cases of non-infiltration carcinomas where dense breasts limit mammographic detection, and even clustered calcifications not associated with a mass. The relative risk of breast cancer was 16.5 times as great with a positive spectroscopic value at a sensitivity range of 87 per cent. Placement of 87 per cent of all breast cancer cases in a subset of 28.7 per cent of all women will yield a population of women in whom mammography will be approximately four times as efficient.

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38

Quaroni, Luca, Katarzyna Pogoda, Joanna Wiltowska-Zuber y Wojciech M. Kwiatek. "Mid-infrared spectroscopy and microscopy of subcellular structures in eukaryotic cells with atomic force microscopy – infrared spectroscopy". RSC Advances 8, n.º 5 (2018): 2786–94. http://dx.doi.org/10.1039/c7ra10240b.

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Atomic force microscopy – infrared (AFM-IR) spectroscopy allows spectroscopic studies in the mid-infrared (mid-IR) spectral region with a spatial resolution better than is allowed by the diffraction limit.

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39

Krishnapuram, Pavani y Suresh Kumar Jakka. "Spectroscopy in Characterization of Materials—Developments". Applied Sciences 14, n.º 10 (19 de mayo de 2024): 4304. http://dx.doi.org/10.3390/app14104304.

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The intention of the Special Issue “Advances in Spectroscopy for Materials: Bridging Science and Engineering” is to include various enthusiastic works that focus on the use of various analytical spectroscopic techniques while characterizing materials [...]

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40

Ciavarella, Susan, Graeme D. Batten y Anthony B. Blakeney. "Measuring Potassium in Plant Tissues Using near Infrared Spectroscopy". Journal of Near Infrared Spectroscopy 6, A (enero de 1998): A63—A66. http://dx.doi.org/10.1255/jnirs.167.

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Near infrared (NIR) spectroscopy is routinely used to determine constituents with organic bonds which absorb electromagnetic radiation in the region 1100 to 2500 nm. The nitrogen fertilizer requirements of cereal crops are determined from the analysis of vegetative samples by NIR spectroscopy. Simultaneous determination of other plant-essential elements would enhance the value of the analysis. Compared to nitrogen, other essential elements are either present at a lower concentration in the tissue or present largely in an inorganic form which is not detectable by NIR spectroscopy. In this paper we report NIR spectroscopic calibrations for potassium in grape petioles, grape leaves, rice shoots and orange leaves. When tested against a set of verification samples the NIR spectroscopic calibrations accounted for 96, 89, 93 and 85% of the concentration of K with standard errors of performance of 0.16, 0.12, 0.18 and 0.17%K respectively.

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41

Hamid, Sheida y Arash Mouradzadegun. "3D-Network porous polymer bonded metalloporphyrin: An efficient and reusable catalyst for the Baeyer-Villiger oxidation". Journal of Porphyrins and Phthalocyanines 26, n.º 02 (11 de noviembre de 2021): 171–79. http://dx.doi.org/10.1142/s1088424621501273.

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A new, green catalyst was prepared through immobilization of metalloporphyrin on the surface of 3D-network polymer based on calix[4]resorcinarene (PC4RA), which efficiently catalyze B-V oxidation reaction using O2/benzaldehyde. The catalyst demonstrated excellent activity, which is highly potential for cyclic aliphatic ketones oxidation under mild conditions. IR spectroscopy, UV-Vis spectroscopy, thermal gravimetric analysis, energy dispersive spectroscopy and scanning electron microscopy are some of the spectroscopic methods used to characterize the new synthesized solid support.

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42

Terzic, Mira, Janez Mozina y Darja Horvat. "Using lasers to measure pollutants". Facta universitatis - series: Physics, Chemistry and Technology 4, n.º 1 (2006): 71–81. http://dx.doi.org/10.2298/fupct0601071t.

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In recent years, a large number of linear and nonlinear laser-based diagnostic techniques for detection of pollutions in different environments have been developed. Applications of laser spectroscopy constitute a vast field, which is difficult to cover comprehensively in a review. Due to that here are presented only a few spectroscopic methods, chosen to illustrate the power of applied laser spectroscopy in environmental pollution investigation. The paper also gives a brief presentation of main laser spectroscopy methods.

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43

Moorchilot, Vishnu S., Usha K. Aravind, Sunil Paul M. Menacherry y Charuvila T. Aravindakumar. "Single-Particle Analysis of Atmospheric Aerosols: Applications of Raman Spectroscopy". Atmosphere 13, n.º 11 (28 de octubre de 2022): 1779. http://dx.doi.org/10.3390/atmos13111779.

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Atmospheric aerosols, produced as a consequence of different anthropogenic and natural processes, impart significant control over the global energy budget, climate, and human–environmental health. Their size varies across the nano–micrometer scale. Based on their origin, they may be classified into primary or secondary aerosols. Biomass burning, incomplete combustion of fossil fuels, volcanic eruptions, and traffic-related and wind-driven suspensions contribute to primary aerosol emissions. In contrast, gas-to-particle conversion within the atmosphere leads to secondary particle production. The study of atmospheric aerosols is vital to the field of atmospheric research. The dynamic nature (highly variable concentration composition and size with space and time) of aerosols makes them difficult to investigate. Today, aerosol research involves the application of various spectrometric and spectroscopic techniques. The single-particle analysis of aerosols is yet a challenge. In this review, the merits and demerits of various offline and online techniques used for aerosol research are discussed in a nutshell. Mass spectrometric techniques fail in distinguishing certain species. However, Raman spectroscopy’s emergence for the compositional analysis of aerosols resolves most of the present characterization challenges. This review focuses on Raman spectroscopy applications, the merits of this technique, and its immense scope for the measurement of various types of aerosols and their properties. Surface-enhanced Raman spectroscopy (SERS) has an advantage over conventional micro-Raman spectroscopy (MRS). The review depicts the dominance of SERS, specifically in the context of the measurement of ambient atmospheric aerosols. This review discusses two important components, namely laboratory simulation and ambient aerosol studies.

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44

Maíz Apellániz, J., R. H. Barbá, S. Simón-Díaz, A. Sota, E. Trigueros Páez, J. A. Caballero y E. J. Alfaro. "Lucky Spectroscopy, an equivalent technique to Lucky Imaging". Astronomy & Astrophysics 615 (julio de 2018): A161. http://dx.doi.org/10.1051/0004-6361/201832885.

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Context. Many massive stars have nearby companions whose presence hamper their characterization through spectroscopy. Aims. We want to obtain spatially resolved spectroscopy of close massive visual binaries to derive their spectral types. Methods. We obtained a large number of short long-slit spectroscopic exposures of five close binaries under good seeing conditions. We selected those with the best characteristics, extracted the spectra using multiple-profile fitting, and combined the results to derive spatially separated spectra. Results. We demonstrate the usefulness of Lucky Spectroscopy by presenting the spatially resolved spectra of the components of each system, in two cases with separations of only ~0.′′3. Those are δ Ori Aa+Ab (resolved in the optical for the first time) and σ Ori AaAb+B (first time ever resolved). We also spatially resolve 15 Mon AaAb+B, ζ Ori AaAb+B (both previously resolved with GOSSS, the Galactic O-Star Spectroscopic Survey), and η Ori AaAb+B, a system with two spectroscopic B+B binaries and a fifth visual component. The systems have in common that they are composed of an inner pair of slow rotators orbited by one or more fast rotators, a characteristic that could have consequences for the theories of massive star formation.

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Jehlička, Jan, Howell G. M. Edwards y Aharon Oren. "Raman Spectroscopy of Microbial Pigments". Applied and Environmental Microbiology 80, n.º 11 (28 de marzo de 2014): 3286–95. http://dx.doi.org/10.1128/aem.00699-14.

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ABSTRACTRaman spectroscopy is a rapid nondestructive technique providing spectroscopic and structural information on both organic and inorganic molecular compounds. Extensive applications for the method in the characterization of pigments have been found. Due to the high sensitivity of Raman spectroscopy for the detection of chlorophylls, carotenoids, scytonemin, and a range of other pigments found in the microbial world, it is an excellent technique to monitor the presence of such pigments, both in pure cultures and in environmental samples. Miniaturized portable handheld instruments are available; these instruments can be used to detect pigments in microbiological samples of different types and origins under field conditions.

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46

Farooq, Bilal. "Autler–Townes quadruplet spectroscopy". Canadian Journal of Physics 91, n.º 10 (octubre de 2013): 783–87. http://dx.doi.org/10.1139/cjp-2013-0116.

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We suggest an atomic scheme of Autler–Townes quadruplet spectroscopy by extending the concepts of Autler–Townes doublet and triplet spectroscopy. The present scheme is analyzed in detail with the help of a state vector approach to calculate its emission spectrum. By applying rotating wave and Weisskopf–Wigner approximations to our proposed scheme, we have successfully attained a simple analytical expression of the spectrum interpreting the basic mechanism involved in the process of quantum interference. All the spectroscopic parameters, like the locations of dark lines and the locations and widths of all the peaks, are presented in analytical form. These analyses provide a better understanding of the phenomenon of the Autler–Townes quadruplet spectrum.

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47

Pospieszczyk, A. "Spectroscopy". Fusion Science and Technology 45, n.º 2T (marzo de 2004): 426–33. http://dx.doi.org/10.13182/fst04-a509.

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48

Pospieszczyk, A. "Spectroscopy". Fusion Science and Technology 49, n.º 2T (febrero de 2006): 395–403. http://dx.doi.org/10.13182/fst06-a1139.

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49

Pospieszczyk, A. "Spectroscopy". Fusion Science and Technology 53, n.º 2T (febrero de 2008): 417–24. http://dx.doi.org/10.13182/fst08-a1727.

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50

Lagopoulos, Jim. "Spectroscopy". Acta Neuropsychiatrica 19, n.º 6 (diciembre de 2007): 382–83. http://dx.doi.org/10.1111/j.1601-5215.2007.00259.x.

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