Relevant bibliographies by topics / Isotopic Abundance Ratio Analysis

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Isotopic Abundance Ratio Analysis'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Isotopic Abundance Ratio Analysis"

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Brand, Willi A., Tyler B. Coplen, Jochen Vogl, Martin Rosner, and Thomas Prohaska. "Assessment of international reference materials for isotope-ratio analysis (IUPAC Technical Report)." Pure and Applied Chemistry 86, no. 3 (2014): 425–67. http://dx.doi.org/10.1515/pac-2013-1023.

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AbstractSince the early 1950s, the number of international measurement standards for anchoring stable isotope delta scales has mushroomed from 3 to more than 30, expanding to more than 25 chemical elements. With the development of new instrumentation, along with new and improved measurement procedures for studying naturally occurring isotopic abundance variations in natural and technical samples, the number of internationally distributed, secondary isotopic reference materials with a specified delta value has blossomed in the last six decades to more than 150 materials. More than half of these
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Trivedi, Mahendra Kumar, Alice Branton, Dahryn Trivedi, Gopal Nayak, Parthasarathi Panda, and Snehasis Jana. "Mass Spectrometric Analysis of Isotopic Abundance Ratio in Biofield Energy Treated Thymol." World Journal of Applied Chemistry 1, no. 1 (2016): 001–8. https://doi.org/10.11648/j.wjac.20160101.11.

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Thymol is a natural monoterpenoid phenol possessing various pharmacological activities such as antimicrobial, antioxidant, etc. The stable isotope ratio analysis has drawn attention in numerous fields such as agricultural, food authenticity, biochemistry, metabolism, medical research, etc. An investigation of the effect of the biofield energy treatment (The Trivedi Effect®) on the isotopic abundance ratios of PM+1/PM and PM+2/PM in thymol using gas chromatography - mass spectrometry was attempted in this study. The sample, thymol was divided into two parts - one part was denoted as control
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Trivedi, Mahendra Kumar, Alice Branton, Dahryn Trivedi, Gopal Nayak, Parthasarathi Panda, and Snehasis Jana. "Mass Spectrometric Analysis of Isotopic Abundance Ratio in Biofield Energy Treated Thymol." World Journal of Applied Chemistry 1, no. 1 (2016): 001–8. https://doi.org/10.5281/zenodo.196892.

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Thymol is a natural monoterpenoid phenol possessing various pharmacological activities such as antimicrobial, antioxidant, etc. The stable isotope ratio analysis has drawn attention in numerous fields such as agricultural, food authenticity, biochemistry, metabolism, medical research, etc. An investigation of the effect of the biofield energy treatment (The Trivedi Effect®) on the isotopic abundance ratios of PM+1/PM and PM+2/PM in thymol using gas chromatography - mass spectrometry was attempted in this study. The sample, thymol was divided into two parts - one part was denoted as control
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Pavlenko, Yakiv V., Sergei N. Yurchenko, and Jonathan Tennyson. "Analysis of the first overtone bands of isotopologues of CO and SiO in stellar spectra." Astronomy & Astrophysics 633 (January 2020): A52. http://dx.doi.org/10.1051/0004-6361/201936811.

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Context. This study is based on models of the first overtone (Δv = 2) bands of the monosubstituted isotopologues of CO at 2.3 μm in the spectrum of Arcturus (K2 III) and of the monosubstituted isotopologues of SiO at 4 μm in the spectrum of the red giant HD 196610 (M6 III). Aims. We aim to investigate problems involving the computation of the first overtone bands of isotopologues of CO and SiO in the spectra of late-type stars and to determine isotopic abundances. Methods. We used fits of theoretical synthetic spectra to the observed stellar molecular bands of CO and SiO for determining the ab
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Trivedi, Mahendra Kumar, Alice Branton, Dahryn Trivedi, Gopal Nayak, Parthasarathi Panda, and Snehasis Jana. "Isotopic Abundance Ratio Analysis of 1,2,3-Trimethoxybenzene (TMB) After Biofield Energy Treatment (The Trivedi Effect®) Using Gas Chromatography-Mass Spectrometry." American Journal of Applied Chemistry 4, no. 4 (2016): 132–40. https://doi.org/10.11648/j.ajac.20160404.13.

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1,2,3-Trimethoxybenzene (TMB) is one of the most versatile chemical used for the synthesis of several pharmaceuticals, dyes, polymers, organic compounds, etc. The stable isotope ratio analysis has increased attention day-by-days in several fields such as agricultural, food authenticity, biochemistry, medical research, etc. The current study was aimed to evaluate the effect of the biofield energy treatment on the isotopic abundance ratios of 13C/12C or 2H/1H or 17O/16O (PM+1/PM) and 18O/16O (PM+2/PM) in TMB using Gas chromatography - mass spectrometry (GC-MS) technique. TMB was divided into two
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Trivedi, Mahendra Kumar, Alice Branton, Dahryn Trivedi, Gopal Nayak, Parthasarathi Panda, and Snehasis Jana. "Isotopic Abundance Ratio Analysis of 1,2,3-Trimethoxybenzene (TMB) After Biofield Energy Treatment (The Trivedi Effect®) Using Gas Chromatography-Mass Spectrometry." American Journal of Applied Chemistry 4, no. 4 (2016): 132–40. https://doi.org/10.5281/zenodo.196902.

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1,2,3-Trimethoxybenzene (TMB) is one of the most versatile chemical used for the synthesis of several pharmaceuticals, dyes, polymers, organic compounds, etc. The stable isotope ratio analysis has increased attention day-by-days in several fields such as agricultural, food authenticity, biochemistry, medical research, etc. The current study was aimed to evaluate the effect of the biofield energy treatment on the isotopic abundance ratios of 13C/12C or 2H/1H or 17O/16O (PM+1/PM) and 18O/16O (PM+2/PM) in TMB using Gas chromatography - mass spectrometry (GC-MS) technique. TMB was divided into two
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Trivedi, Mahendra Kumar, Alice Branton, Dahryn Trivedi, Gopal Nayak, Kalyan Kumar Sethi, and Snehasis Jana. "Isotopic Abundance Ratio Analysis of Biofield Energy Treated Indole Using Gas Chromatography-Mass Spectrometry." Science Journal of Chemistry 4, no. 4 (2016): 41–48. https://doi.org/10.11648/j.sjc.20160404.11.

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The objective of the current experiment was to evaluate the effect of biofield energy treatment on the isotopic abundance ratio of PM+1/PM (2H/1H or 13C/12C or 15N/14N) in indole using the gas chromatography-mass spectrometry (GC-MS). The sample of organic compound indole was divided into two parts - one part was designated as a control sample (untreated), and another part was considered as biofield energy treated sample, which was subjected to Mr. Trivedi’s biofield energy treatment (The Trivedi Effect®). The biofield energy treated indole sample was analyzed at different time inter
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Trivedi, Mahendra Kumar, Alice Branton, Dahryn Trivedi, Gopal Nayak, Kalyan Kumar Sethi, and Snehasis Jana. "Isotopic Abundance Ratio Analysis of Biofield Energy Treated Indole Using Gas Chromatography-Mass Spectrometry." Science Journal of Chemistry 4, no. 4 (2016): 41–48. https://doi.org/10.5281/zenodo.196928.

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The objective of the current experiment was to evaluate the effect of biofield energy treatment on the isotopic abundance ratio of PM+1/PM (2H/1H or 13C/12C or 15N/14N) in indole using the gas chromatography-mass spectrometry (GC-MS). The sample of organic compound indole was divided into two parts - one part was designated as a control sample (untreated), and another part was considered as biofield energy treated sample, which was subjected to Mr. Trivedi’s biofield energy treatment (The Trivedi Effect®). The biofield energy treated indole sample was analyzed at different time inter
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Trivedi, Mahendra Kumar, Alice Branton, Dahryn Trivedi, Gopal Nayak, Kalyan Kumar Sethi, and Snehasis Jana. "Gas Chromatography-Mass Spectrometry Based Isotopic Abundance Ratio Analysis of Biofield Energy Treated Methyl-2-napthylether (Nerolin)." American Journal of Physical Chemistry 5, no. 4 (2016): 80–86. https://doi.org/10.11648/j.ajpc.20160504.11.

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Methyl-2-napthylether (nerolin) is an organic compound and has the applications in pharmaceutical, and perfume industry. The stable isotope ratio analysis is increasing importance in various field of scientific research. The objective of the current study was to evaluate the effect of the biofield energy treatment on the isotopic abundance ratios of PM+1/PM (2H/1H or 13C/12C or 17O/16O) and PM+2/PM (18O/16O) in nerolin using the gas chromatography-mass spectrometry (GC-MS). The compound nerolin was divided into two parts - one part was control sample (untreated), and another part was considere
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Trivedi, Mahendra Kumar, Alice Branton, Dahryn Trivedi, Gopal Nayak, Kalyan Kumar Sethi, and Snehasis Jana. "Gas Chromatography-Mass Spectrometry Based Isotopic Abundance Ratio Analysis of Biofield Energy Treated Methyl-2-napthylether (Nerolin)." American Journal of Physical Chemistry 5, no. 4 (2016): 80–86. https://doi.org/10.5281/zenodo.196912.

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Methyl-2-napthylether (nerolin) is an organic compound and has the applications in pharmaceutical, and perfume industry. The stable isotope ratio analysis is increasing importance in various field of scientific research. The objective of the current study was to evaluate the effect of the biofield energy treatment on the isotopic abundance ratios of PM+1/PM (2H/1H or 13C/12C or 17O/16O) and PM+2/PM (18O/16O) in nerolin using the gas chromatography-mass spectrometry (GC-MS). The compound nerolin was divided into two parts - one part was control sample (untreated), and another part was considere
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Dissertations / Theses on the topic "Isotopic Abundance Ratio Analysis"

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Jezequel, Tangi. "Methodological developments for highly accurate quantitative ¹³C NMR : applied to isotopic analysis at natural abundance." Thesis, Nantes, 2018. http://www.theses.fr/2018NANT4058/document.

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L’analyse isotopique position-spécifique est une application de la RMN ¹³C quantitative qui permet de déterminer l’origine de molécules biologiques ou synthétiques grâce à la détermination de la distribution intramoléculaire du ¹³C au sein d’un composé organique. Jusqu’à présent, l’analyse ¹³C par PSIA nécessitait la combinaison de mesures par spectrométrie de masse de rapport isotopique avec des analyses par RMN ¹³C quantitative afin de déterminer les compositions isotopiques des différents carbones. Cependant, cette stratégie présente plusieurs inconvénients : (i) l’utilisation de deux techn
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Boop, Liana Marie. "Characterization of the Depositional Environment of Phreatic Overgrowths on Speleothems in the Littoral Caves of Mallorca (Spain): a Physical, Geochemical, and Stable Isotopic Study." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5187.

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Phreatic overgrowths on speleothems (POS) are one of many sea-level proxies available to Quaternary geologists in Mallorca; these carbonate encrustations form at the air-water interface in cave passages flooded with brackish water. POS are ideal for reconstruction of western Mediterranean sea level because they are widespread in Mallorca's caves, can be precisely dated by U-series methods, constrain sea-level stands to sub-meter elevation, and are well preserved and accessible in the subterranean environment. This research investigates the POS depositional environment, which is relatively unde
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Yong, David C. Lambert David L. "Isotopic abundance analysis of field and cluster stars." 2004. http://wwwlib.umi.com/cr/utexas/fullcit?p3145826.

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Yong, David C. 1974. "Isotopic abundance analysis of field and cluster stars." 2004. http://hdl.handle.net/2152/12822.

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Kaushal, Ritika. "Stable Isotopic Composition of Rice Grain Organic Matter as an Archive of Monsoonal Climate." Thesis, 2015. http://etd.iisc.ernet.in/2005/3995.

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Rice grows in saturated soil water condition and its requirement for water is highest amongst other cereal crops. In India, the southwest monsoon wind regime brings rainfall that provides a favourable environment for rice cultivation. Thus, there is significant dependency ofrice production on the southwest monsoon rainfall. Being a crop that grows across diverse climatic regions in India ranging from the humid to semi-arid, it offers possibility to explore therelationship between stable isotopic compositions in the grain organic matter with the climaticfactors relevant for its growth. In this
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Kaushal, Ritika. "Stable Isotopic Composition of Rice Grain Organic Matter as an Archive of Monsoonal Climate." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4019.

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Rice grows in saturated soil water condition and its requirement for water is highest amongst other cereal crops. In India, the southwest monsoon wind regime brings rainfall that provides a favourable environment for rice cultivation. Thus, there is significant dependency ofrice production on the southwest monsoon rainfall. Being a crop that grows across diverse climatic regions in India ranging from the humid to semi-arid, it offers possibility to explore therelationship between stable isotopic compositions in the grain organic matter with the climaticfactors relevant for its growth. In this
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Kaushal, Ritika. "Stable Isotopic Composition of Rice Grain Organic Matter as an Archive of Monsoonal Climate." Thesis, 2017. http://etd.iisc.ernet.in/2005/3996.

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Rice grows in saturated soil water condition and its requirement for water is highest amongst other cereal crops. In India, the southwest monsoon wind regime brings rainfall that provides a favourable environment for rice cultivation. Thus, there is significant dependency ofrice production on the southwest monsoon rainfall. Being a crop that grows across diverse climatic regions in India ranging from the humid to semi-arid, it offers possibility to explore therelationship between stable isotopic compositions in the grain organic matter with the climaticfactors relevant for its growth. In this
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Craig, O. E., R. B. Allen, A. Thompson, R. E. Stevens, Valerie J. Steele, and Carl P. Heron. "Distinguishing wild ruminant lipids by gas chromatography/combustion/isotope ratio mass spectrometry." 2012. http://hdl.handle.net/10454/5945.

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No<br>RATIONALE: The carbon isotopic characterisation of ruminant lipids associated with ceramic vessels has been crucial for elucidating the origins and changing nature of pastoral economies. delta(13)C values of fatty acids extracted from potsherds are commonly compared with those from the dairy and carcass fats of modern domesticated animals to determine vessel use. However, the processing of wild ruminant products in pottery, such as deer, is rarely considered despite the presence of several different species on many prehistoric sites. To address this issue, the carbon isotope range of fat
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Books on the topic "Isotopic Abundance Ratio Analysis"

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Noto, Masami. ¹⁸O/¹⁶O ratio determination of framework oxygen of apophyllite and wairakite by the preferential isotopic exchange of their water of crystallization. Institute for Study of the Earth's Interior, Okayama University, 1989.

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Book chapters on the topic "Isotopic Abundance Ratio Analysis"

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Taggart, Dora M., and Trent A. Key. "Molecular Biological Tools Used in Assessment and Remediation of Petroleum Hydrocarbons in Soil and Groundwater." In Advances in the Characterisation and Remediation of Sites Contaminated with Petroleum Hydrocarbons. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-34447-3_10.

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AbstractMolecular biological tools (MBTs) are used to assess and characterize the microbiology and associated biological processes at contaminated sites, including ecological roles, phylogenetic diversity, and metabolic and co-metabolic capabilities related to contaminant biodegradation and biotransformation. MBTs have changed our approach to the assessment and remediation of petroleum hydrocarbons in the environment. In contaminated-site management, several MBTs and stable isotope analysis methods can be used to measure the presence, abundance, and activity of petroleum hydrocarbon-degrading
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Meisel, Thomas. "Quality Control in Isotope Ratio Applications." In Isotopic Analysis. Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527650484.ch7.

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Meija, Juris, Lu Yang, Zoltán Mester, and Ralph E. Sturgeon. "Correction of Instrumental Mass Discrimination for Isotope Ratio Determination with Multi-Collector Inductively Coupled Plasma Mass Spectrometry." In Isotopic Analysis. Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527650484.ch5.

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Beecher, Chris, and Felice A. de Jong. "Isotopic Ratio Outlier Analysis (IROA) for Quantitative Analysis." In Methods in Molecular Biology. Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9488-5_2.

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Beecher, Chris, and Felice A. de Jong. "Isotopic Ratio Outlier Analysis (IROA) for Quantitative Analysis." In Methods in Molecular Biology. Springer US, 2025. https://doi.org/10.1007/978-1-0716-4534-5_4.

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Piqueras, Maria Del Carmen, Ciara Myer, Anna Junk, and Sanjoy K. Bhattacharya. "Isotopic Ratio Outlier Analysis (IROA) of Aqueous Humor for Metabolites." In Methods in Molecular Biology. Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9488-5_15.

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Sénécaut, Nicolas, Pierre Poulain, Laurent Lignières, et al. "Quantitative Proteomics in Yeast: From bSLIM and Proteome Discoverer Outputs to Graphical Assessment of the Significance of Protein Quantification Scores." In Methods in Molecular Biology. Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2257-5_16.

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AbstractSimple light isotope metabolic labeling (bSLIM) is an innovative method to accurately quantify differences in protein abundance at the proteome level in standard bottom-up experiments. The quantification process requires computation of the ratio of intensity of several isotopologs in the isotopic cluster of every identified peptide. Thus, appropriate bioinformatic workflows are required to extract the signals from the instrument files and calculate the required ratio to infer peptide/protein abundance. In a previous study (Sénécaut et al., J Proteome Res 20:1476–1487, 2021), we develop
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Kratz, K. L., W. Hillebrandt, J. Krumlinde, et al. "A Possible Unified Interpretation of the Solar 48Ca/46Ca Abundance Ratio and Ca-Ti Isotopic Anomalies in Meteorites." In Nucleosynthesis and Its Implications on Nuclear and Particle Physics. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4578-4_43.

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Brooks, J. Renée, William D. Rugh, and Roland A. Werner. "Tree-Ring Stable Isotope Measurements: The Role of Quality Assurance and Quality Control to Ensure High Quality Data." In Stable Isotopes in Tree Rings. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_6.

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AbstractQuality assuranceand quality control(QA/QC) are important components of every study. In this chapter, we give an overview of QA/QC specific for tree-ring stable-isotope analysis from the perspective of the entire research project, rather than from the operation of Isotope Ratio Mass Spectrometers (IRMS). We address how users of stable isotope tree-ring data can quantify the quality of their data for reporting in publications by calculating accuracy and precision. We cover some of the potential sources of error that can occur during sample processing and isotopic measurements, basic pri
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Hillebrandt, W., K. L. Kratz, F. K. Thielemann, and W. Ziegert. "Interpretation of the Solar 48Ca/46Ca Abundance Ratio and the Correlated Ca-Ti-Cr Isotopic Anomalies in Inclusions of the Allende Meteorite." In Weak and Electromagnetic Interactions in Nuclei. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-71689-8_190.

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Conference papers on the topic "Isotopic Abundance Ratio Analysis"

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Rangel, Gabriela Flores, Lorena Diaz de León Martinez, and Boris Mizaikoff. "Non-Invasive Helicobacter Pylori Detection via Mid-Infrared iHWG Sensor." In Latin America Optics and Photonics Conference. Optica Publishing Group, 2024. https://doi.org/10.1364/laop.2024.tu4a.31.

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Helicobacter pylori infection is linked to gastrointestinal disorders, including gastric cancer, necessitating efficient detection technologies. This study evaluates substrate-integrated hollow waveguide (iHWG) sensors using mid-infrared Fourier-transform infrared (FTIR) spectroscopy for precise isotopic ratio measurement of ¹³CO₂ to ¹²CO₂ in simulated breath analysis conditions. Three iHWGs of varying lengths were tested, optimizing the gas-light interaction to enhance sensitivity. Results show high precision and stability, establishing the FTIR-iHWG system as a promising platform for non-inv
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Shaw, R. W., C. M. Barshick, J. P. Young, and J. M. Ramsey. "Diode Laser Optogalvanic Spectroscopy for Uranium Isotopic Analysis: Analytical Figures of Merit." In Laser Applications to Chemical and Environmental Analysis. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/lacea.1996.lwa.3.

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High resolution optogalvanic spectroscopy, excited using near-infrared semiconductor diode lasers, has been utilized for the determination of 235⋃/238⋃ isotopic ratios for uranium and uranium compounds.1,2 The samples ranged from depleted (0.27%) to enriched (20%) 235⋃ abundance. The goal of this effort has been to develop a technique that is suitable for use in the field for measurements at moderate precision. Glow discharge sampling can be conveniently accomplished in such settings, and diode lasers are sufficiently rugged and simple for incorporation into routine instruments. The concept of
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Bazinet, Richard. "New methods using natural abundance carbon isotope ratio analysis to measure the turnover of docosahexaenoic acid in preclinical models." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/aloq1878.

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Recently, our laboratory has explored an alternative and cost-effective technique called compound-specific isotope analysis by gas-chromatography isotope ratio mass spectrometry that takes advantage of natural differences in carbon-13 content (13C/12C ratio or d13C) of the food supply to better understand tissue DHA metabolism. However, a lack of variation in the d13C of some molecules limits the methods utility. Here I will present two novel approaches that can be used to circumvent this limitation. Alpha-linolenic acid (ALA), is a well know precursor to docosahexaenoic acid, but it is diffic
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Lu, Feng Hu. "Using Isotope Technology to Identify Oil and Gas Reservoir Sweet Spots." In SPE Reservoir Characterisation and Simulation Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212642-ms.

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Abstract Porosity and permeability of rocks are crucial parameters utilized to assess the quality of oil and gas reservoirs. Diagenesis in carbonate reservoirs commonly results in dissolution, and creates secondary porosity and permeability. At the same time, geochemical records (e.g., isotopes and elements) in the carbonate rocks are diagenetically altered. This study is to utilize the isotope technology to evaluate diagenesis and its impact on oil and gas reservoirs. Micro-samples were collected from marine carbonate rocks in a studied reservoir for carbon and oxygen isotope analyses, plus a
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Ushikubo, Takayuki, and Kenji Shimizu. "Systematic analyses of volatile abundances, hydrogen and sulfur isotope ratios of melt inclusions." In Goldschmidt 2024. Geochemical Society, 2024. https://doi.org/10.46427/gold2024.22030.

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Xie, Jinsen, and Tao Yu. "Analysis of Isotopic Contributions to Doppler Coefficients of Inert Matrix Fuels." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30620.

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The Minor Actinides (MA) generated by nowadays PWRs fleet has significant impact on environment and biosphere. Inert Matrix Fuels (IMF) is a possible way to reduce the production and hazard of MA in recent. From neutronic aspect, using the MCNP code with temperature related continuous neutron data, the present paper analyses the isotopic contributions to the Doppler Coefficients of certain types IMF fuels. It is concluded that, the Doppler Coefficients of Al2O3+ZrO2+MgO and ZrO2 based IMF fuels are much smaller than those containing ThO2, since the low neutron absorptions and lacking of resona
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Xia, Tian. "Exposure dating with 41Ca analysis at the 10-16 isotopic abundance level." In Goldschmidt2022. European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.11031.

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Barker, Sam, and Arthur T. Kasson. "THE precisION AND isoFLOW. ISOTOPE RATIO MASS SPECTROMETRY AS A VERSATILE FOUNDATION FOR NOVEL ISOTOPIC ANALYSIS." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-280611.

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Xian, Yuxiang, Longxi Liang, Kaiyang Zhang, and Xianji Mo. "Analysis and Simulation of Lamprey Population Dynamics: A Comprehensive Model Integrating Sex Ratio, Food Abundance and Ecosystem Interactions." In ICBIT 2024: 2024 International Conference on Biomedicine and Intelligent Technology. ACM, 2024. https://doi.org/10.1145/3700486.3700521.

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Sauke, T. B., J. R. Podolske, J. F. Becker, M. Loewenstein, V. V. Dinh, and T. D. Gutierrez. "Study of diode laser spectrometer instrument response function in stable isotopic ratio measurements." In OSA Annual Meeting. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.tuz36.

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By using lead-salt tunable diode lasers (TDLs) it is possible to detect individual rovibrational lines and measure their intensity in order to determine gas concentration and isotopic ratio. The 2300 cm−1 spectral region is especially interesting because the 12CO2 and 13CO2 bands overlap in such a way that their rotational lines have almost equal absorbances at the anticipated isotopic ratio of carbon. Using sweep integration and signal averaging techniques, we have measured 3C/12C in CO2 to an accuracy of better than 0.4%. To improve accuracy we have used various techniques to measure, and in
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Reports on the topic "Isotopic Abundance Ratio Analysis"

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Wunschel, David S., Helen W. Kreuzer-Martin, Kathryn C. Antolick, Heather A. Colburn, James J. Moran, and Angela M. Melville. ANALYSIS OF RICIN TOXIN PREPARATIONS FOR CARBOHYDRATE AND FATTY ACID ABUNDANCE AND ISOTOPE RATIO INFORMATION. Office of Scientific and Technical Information (OSTI), 2009. http://dx.doi.org/10.2172/1000835.

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Reid, M. S., X. Wang, N. Utting, and C. Jiang. Comparison of water chemistry of hydraulic-fracturing flowback water from two geological locations at the Duvernay Formation, Alberta, Canada. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/329276.

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Abstract:
We analyzed and compared the water chemistry between 17 Fox Creek region samples, each from a different well, and 23 Three Hills region samples from a single well. Overall, the two regions were similar in chemical composition but showed small differences in some lower abundance dissolved elements. Additionally, we investigated changes in water chemistry of FPW over time from a single well. The majority of water quality parameters and water chemistry remained constant over the 7-month sampling time. Major ion chemistry showed increasing concentrations of Ca and Mg, and a decreasing concentratio
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