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Journal articles on the topic 'Abundance Ratio Analysis'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Griffin, Timothy J., Chris M. Lock, Xiao-jun Li, et al. "Abundance Ratio-Dependent Proteomic Analysis by Mass Spectrometry." Analytical Chemistry 75, no. 4 (2003): 867–74. http://dx.doi.org/10.1021/ac026127j.

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Recio-Blanco, Alejandra. "Automated stellar abundance analysis." Proceedings of the International Astronomical Union 9, S298 (2013): 366–74. http://dx.doi.org/10.1017/s1743921313006571.

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AbstractThe advent of Milky Way high-resolution spectroscopic surveys has brought our attention to the importance of precise chemical abundance measurements to disentangle the stellar population puzzle of the Galaxy. Moreover, automated stellar parameters are the bedrock of Galactic spectroscopic surveys science. They allow a rapid and homogeneous processing of extensive data sets, necessary for an efficient scientific return. In this review, I discuss the different parametrization techniques, focusing on the automated determination of individual element abundances. Each of them has its optima

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Moharana, Satyajeet, B. P. Hema, and Gajendra Pandey. "Helium Abundance of the Sun: A Spectroscopic Analysis." Astrophysical Journal 974, no. 2 (2024): 312. http://dx.doi.org/10.3847/1538-4357/ad6ccf.

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Abstract Determining the He/H ratio in cool stars presents a fundamental astrophysical challenge. While this ratio is established for hot O and B stars, its extrapolation to cool stars remains uncertain due to the absence of helium lines in their observed spectra. We address this knowledge gap by focusing on the Sun as a representative cool star. We conduct spectroscopic analyses of the observed solar photospheric lines by utilizing a combination of MgH molecular lines and neutral Mg atomic lines including yet another combination of CH and C2 molecular lines with neutral C atomic lines. Our sp

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Tomkin, Jocelyn. "High Signal-To-Noise Ratio - the Spectroscopic Key to Algol Systems." International Astronomical Union Colloquium 107 (1989): 245–55. http://dx.doi.org/10.1017/s0252921100087820.

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AbstractThe usefulness of high signal-to-noise-ratio spectra for both radial-velocity and abundance studies of Algol systems is emphasised. It is shown that division by a hot star is a worthwhile step in pursuit of this objective. A preliminary analysis of high signal-to-noise-ratio, red and near-infrared, Reticon observations of R CMa shows that its primary has solar CNO abundances within the 0.3 dex observational error. The low-mass (0.17 m⊙) secondary of this Algol system must have lost a large fraction of its original mass. Some of this material would have been extensively processed during

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Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "Isotopic Abundance Ratio Analysis of Consciousness Energy Healing Treated Folic Acid." Food and Nutrition-Current Research 4, no. 2 (2021): 290–95. https://doi.org/10.5281/zenodo.10275764.

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Folic acid is the water-soluble vitamin used as a dietary supplement, involved in the synthesis and repair of DNA and RNA, aiding rapid cell division and growth, enhancing the overall brain functions, etc. in the body. In this research work, the impact of the Trivedi Effect® on the structural properties and the isotopic abundance ratio of folic acid was investigated using LC-MS spectroscopy. The folic acid power was divided into control and treated parts. Only the treated folic acid received the Trivedi Effect®-Consciousness Energy Healing Treatment remotely by a well-known Biofield Energy Hea

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Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "Isotopic Abundance Ratio Analysis of Consciousness Energy Healing Treated Folic Acid." Food and Nutrition-Current Research 4, no. 2 (2021): 290–95. https://doi.org/10.5281/zenodo.10275762.

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Folic acid is the water-soluble vitamin used as a dietary supplement, involved in the synthesis and repair of DNA and RNA, aiding rapid cell division and growth, enhancing the overall brain functions, etc. in the body. In this research work, the impact of the Trivedi Effect® on the structural properties and the isotopic abundance ratio of folic acid was investigated using LC-MS spectroscopy. The folic acid power was divided into control and treated parts. Only the treated folic acid received the Trivedi Effect®-Consciousness Energy Healing Treatment remotely by a well-known Biofield Energy Hea

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Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "Isotopic Abundance Ratio Analysis of Consciousness Energy Healing Treated Folic Acid." Food and Nutrition-Current Research 4, no. 2 (2021): 290–95. https://doi.org/10.5281/zenodo.10275756.

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Folic acid is the water-soluble vitamin used as a dietary supplement, involved in the synthesis and repair of DNA and RNA, aiding rapid cell division and growth, enhancing the overall brain functions, etc. in the body. In this research work, the impact of the Trivedi Effect® on the structural properties and the isotopic abundance ratio of folic acid was investigated using LC-MS spectroscopy. The folic acid power was divided into control and treated parts. Only the treated folic acid received the Trivedi Effect®-Consciousness Energy Healing Treatment remotely by a well-known Biofield Energy Hea

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8

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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9

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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10

Walton, N. A., M. J. Barlow, and R. E. S. Clegg. "The UV and optical reddening law to the Galactic Bulge and CNO abundances in Bulge planetary nebulae." Symposium - International Astronomical Union 153 (1993): 337–38. http://dx.doi.org/10.1017/s0074180900123496.

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An analysis of the differential ultraviolet extinction towards four bulge planetary nebulae, based on the observed line ratio of He II 1640/4686Å, shows that the ultraviolet reddening law towards the bulge is much steeper than in the solar neighbourhood. An analysis of the optical reddening law for 42 bulge PN, based upon observed Balmer line ratios and Hβ to radio free-free flux ratios, is presented. The optical reddening law towards the bulge is steeper than in the local ISM, and thus the ratio of total to selective extinction, Rv = 2.29 (± 0.50), is lower than the standard solar neighbourho

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11

Collet, Remo. "Spectroscopy with Three-Dimensional Model Atmospheres of Late-Type Stars." Proceedings of the International Astronomical Union 11, A29B (2015): 151–53. http://dx.doi.org/10.1017/s174392131600466x.

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AbstractIn this contribution, I present the results of a differential analysis of CH spectral lines for the determination of carbon abundances with three- and one-dimensional model atmospheres of late-type stars at various metallicities. 3D-1D abundance corrections are found to be significant particularly at low metallicities and for turn-off stars. The dependence of 3D-1D carbon abundance corrections on the stellar C/O ratio is also discussed.

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François, P., E. Caffau, S. Wanajo, et al. "Chemical analysis of very metal-poor turn-off stars from SDSS-DR12." Astronomy & Astrophysics 619 (October 30, 2018): A10. http://dx.doi.org/10.1051/0004-6361/201833824.

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Context. The most metal-poor stars are the relics of the early chemical evolution of the Galaxy. Their chemical composition is an important tool to constrain the nucleosynthesis in the first generation of stars. The aim is to observe a sample of extremely metal-poor star (EMP stars) candidates selected from the Sloan Digital Sky Survey Data Release 12 (SDSS DR12) and determine their chemical composition. Aims. We obtain medium resolution spectra of a sample of six stars using the X-shooter spectrograph at the Very Large Telescope (VLT) and we used ATLAS models to compute the abundances. Method

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Latouf, Natasha, Michael D. Himes, Avi M. Mandell, et al. "BARBIE. Bayesian Analysis for Remote Biosignature Identification on exoEarths. III. Introducing the KEN." Astronomical Journal 169, no. 1 (2024): 50. https://doi.org/10.3847/1538-3881/ad9729.

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Abstract We deploy a newly generated set of geometric albedo spectral grids to examine the detectability of methane (CH4) in the reflected-light spectrum of an Earth-like exoplanet at visible and near-infrared (NIR) wavelengths with a future exoplanet imaging mission. By quantifying the detectability as a function of signal-to-noise ratio (SNR) and molecular abundance, we can constrain the best methods of detection with the high-contrast space-based coronagraphy slated for the next-generation telescopes such as the Habitable Worlds Observatory. We used 25 bandpasses between 0.8 and 1.5 μm. The

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Itagaki, Tatsuki, Hirokazu Kobayashi, Ken-ichiro Sakata, Ikuya Miyamoto, Akira Hasebe, and Yoshimasa Kitagawa. "Compositional Data and Microbiota Analysis: Imagination and Reality." Microorganisms 12, no. 7 (2024): 1484. http://dx.doi.org/10.3390/microorganisms12071484.

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The relationships among bacterial flora, diseases, and diet have been described by many authors. An operational taxonomic units (OTUs) are the result of clustering the 16S rRNA gene sequences at a certain cutoff value, and they are considered compositional data. As Pearson’s correlation coefficient is difficult to interpret, Aitchison’s ratio analysis was used to develop a method to handle compositional data. Multivariate analysis was developed because univariate analysis can be subject to large biases. Simulations regarding absolute abundance based on certain assumptions and some analyses, su

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Purandardas, Meenakshi, Aruna Goswami, Partha Pratim Goswami, J. Shejeelammal, and Thomas Masseron. "Chemical analysis of CH stars – III. Atmospheric parameters and elemental abundances." Monthly Notices of the Royal Astronomical Society 486, no. 3 (2019): 3266–89. http://dx.doi.org/10.1093/mnras/stz759.

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Abstract Elemental abundances of CH stars can provide observational constraints for theoretical studies on the nucleosynthesis and evolution of low- and intermediate-mass stars. However, available abundance data in literature are quite scanty. In our pursuit to generate a homogeneous data base of elemental abundances of CH stars we have performed a detailed chemical abundance study for a sample of 12 potential CH star candidates based on high-resolution spectroscopy. We present first time abundance analysis for the objects HE0308–1612, CD−281082, HD30443, and HD87853. For the other objects, al

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Phanwilai, Supaporn, Pongsak (Lek) Noophan, Chi-Wang Li, and Kwang-Ho Choo. "Efficacies of Nitrogen Removal and Comparisons of Microbial Communities in Full-Scale (Pre-Anoxic Systems) Municipal Water Resource Recovery Facilities at Low and High COD:TN Ratios." Water 14, no. 5 (2022): 720. http://dx.doi.org/10.3390/w14050720.

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At a low COD:TN ratio (≤5) in influent, maintaining a longer HRT (≥9 h) and longer SRT (≥30 d) are suggested to improve higher N removal efficiency in case of operation at low DO (Dissolved oxygen) level (0.9 ± 0.2 mg-O2/L). However, in case of operation at high DO level (4.0 ± 0.5 mg-O2/L), short HRT (1 h) and typical SRT (17 d) make it possible to achieve nitrogen removal. On the other hand, at a high COD:TN ratio (≥8.4), a typical HRT (9–15 h), SRT (12–19 d), and DO level (1.3–2.6 mg-O2/L) would be applied. Microbial distribution analysis showed an abundance of AOA (Ammonia-oxidizing archae

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Zhang, Lin, and Mark A. Altabet. "Amino-group-specific natural abundance nitrogen isotope ratio analysis in amino acids." Rapid Communications in Mass Spectrometry 22, no. 4 (2008): 559–66. http://dx.doi.org/10.1002/rcm.3393.

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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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20

O'Sullivan, Cathryn A., Steven A. Wakelin, Ian R. P. Fillery, and Margaret M. Roper. "Factors affecting ammonia-oxidising microorganisms and potential nitrification rates in southern Australian agricultural soils." Soil Research 51, no. 3 (2013): 240. http://dx.doi.org/10.1071/sr13039.

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Ammonia-oxidising archaea (AOA) have recently been described as having an important role in soil nitrification. However, published data on factors which influence their distribution and their impact on a soil’s potential nitrification rates (PNR) are sparse, particularly compared with the amount of information available regarding ammonia-oxidising bacteria (AOB). This study had two aims. First, to investigate which environmental factors affect the AOA : AOB ratio in soils from two agricultural regions, and second, to explore whether the abundance of either AOA or AOB correlated with PNR. Sampl

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Trivedi, Mahendra Kumar, Alice Branton, Dahryn Trivedi, and Snehasis Jana. "Structural Characterization and Isotopic Abundance Ratio Analysis of the Consciousness Energy Healing Treated Ofloxacin." Journal of Current Scientific Research 1, no. 3 (2021): 11–20. http://dx.doi.org/10.14302/issn.2766-8681.jcsr-21-3770.

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Ofloxacin is an antibiotic, useful against the number of bacterial infections. This scientific investigation was performed to identify the impact of the Trivedi Effect®-Consciousness Energy Healing Treatment on the structural properties and the isotopic abundance ratio of ofloxacin using sophisticated analytical techniques. Ofloxacin sample was divided into control and treated parts. Only the treated ofloxacin received the Consciousness Energy Healing Treatment remotely by a well-known Biofield Energy Healer, Mr. Mahendra Kumar Trivedi. The LC-MS spectra of both the samples of ofloxacin at ret

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Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "Structural Characterization and Isotopic Abundance Ratio Analysis of the Consciousness Energy Healing Treated Ofloxacin." Journal of Current Scientific Research (JCSR) 1, no. 2 (2021): 11–20. https://doi.org/10.14302/issn.2766-8681.jcsr-21-3770.

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Ofloxacin is an antibiotic, useful against the number of bacterial infections. This scientific investigation was performed to identify the impact of the Trivedi Effect®-Consciousness Energy Healing Treatment on the structural properties and the isotopic abundance ratio of ofloxacin using sophisticated analytical techniques. Ofloxacin sample was divided into control and treated parts. Only the treated ofloxacin received the Consciousness Energy Healing Treatment remotely by a well-known Biofield Energy Healer, Mr. Mahendra Kumar Trivedi. The LC-MS spectra of both the samples of ofloxacin at ret

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Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "Structural Characterization and Isotopic Abundance Ratio Analysis of the Consciousness Energy Healing Treated Ofloxacin." Journal of Current Scientific Research (JCSR) 1, no. 2 (2021): 11–20. https://doi.org/10.5281/zenodo.10277184.

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Ofloxacin is an antibiotic, useful against the number of bacterial infections. This scientific investigation was performed to identify the impact of the Trivedi Effect®-Consciousness Energy Healing Treatment on the structural properties and the isotopic abundance ratio of ofloxacin using sophisticated analytical techniques. Ofloxacin sample was divided into control and treated parts. Only the treated ofloxacin received the Consciousness Energy Healing Treatment remotely by a well-known Biofield Energy Healer, Mr. Mahendra Kumar Trivedi. The LC-MS spectra of both the samples of ofloxacin at ret

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Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "Structural Characterization and Isotopic Abundance Ratio Analysis of the Consciousness Energy Healing Treated Ofloxacin." Journal of Current Scientific Research (JCSR) 1, no. 2 (2021): 11–20. https://doi.org/10.5281/zenodo.10277186.

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Ofloxacin is an antibiotic, useful against the number of bacterial infections. This scientific investigation was performed to identify the impact of the Trivedi Effect®-Consciousness Energy Healing Treatment on the structural properties and the isotopic abundance ratio of ofloxacin using sophisticated analytical techniques. Ofloxacin sample was divided into control and treated parts. Only the treated ofloxacin received the Consciousness Energy Healing Treatment remotely by a well-known Biofield Energy Healer, Mr. Mahendra Kumar Trivedi. The LC-MS spectra of both the samples of ofloxacin at ret

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Latouf, Natasha, Avi M. Mandell, Geronimo L. Villanueva, et al. "Bayesian Analysis for Remote Biosignature Identification on exoEarths (BARBIE). I. Using Grid-based Nested Sampling in Coronagraphy Observation Simulations for H₂O." Astronomical Journal 166, no. 3 (2023): 129. http://dx.doi.org/10.3847/1538-3881/acebc3.

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Abstract Detecting H2O in exoplanet atmospheres is the first step on the path to determining planet habitability. Coronagraphic design currently limits the observing strategy used to detect H2O, requiring the choice of specific bandpasses to optimize abundance constraints. In order to examine the optimal observing strategy for initial characterization of habitable planets using coronagraph-based direct imaging, we quantify the detectability of H2O as a function of signal-to-noise ratio (S/N) and molecular abundance across 25 bandpasses in the visible wavelength range (0.5–1 μm). We use a preco

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Walton, N. A., M. J. Barlow, and R. E. S. Clegg. "Chemical Abundances in Galactic Bulge Pn." Symposium - International Astronomical Union 155 (1993): 581. http://dx.doi.org/10.1017/s0074180900172559.

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We present abundance determinations, in particular of carbon, and C/O ratios, for 11 Galactic bulge planetary nebulae (PN) based on our low resolution UV data from IUE observations and optical spectrophotometry from the Anglo-Australian Telescope. We compare the observed abundances with those predicted by dredge-up theory for the high metallicity Galactic bulge. The sample abundances are also contrasted with the abundances found for PN in the Galactic disk. The mean C/O ratio for the bulge PN is significantly lower than that found for Galactic disk PN. Further, we present an abundance analysis

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Hejazi, Neda, Jerry W. Xuan, David R. Coria, et al. "Chemical Links between a Young M-type T Tauri Star and Its Substellar Companion: Spectral Analysis and C/O Measurement of DH Tau A." Astrophysical Journal 978, no. 1 (2024): 42. https://doi.org/10.3847/1538-4357/ad968c.

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Abstract The chemical abundance measurements of host stars and their substellar companions provide a powerful tool to trace the formation mechanism of the planetary systems. We present a detailed high-resolution spectroscopic analysis of a young M-type star, DH Tau A, which is located in the Taurus molecular cloud belonging to the Taurus-Auriga star-forming region. This star is host to a low-mass companion, DH Tau b, and both the star and the companion are still in their accreting phase. We apply our technique to measure the abundances of carbon and oxygen using carbon- and oxygen-bearing mole

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Han, Z., J. Hu, Z. Zhang, et al. "AB0171 MENDELIAN RANDOMIZATION ANALYSIS REVEALS CAUSAL EFFECTS OF GUT MICROBIOTA ABUNDANCE ON GIANT CELL ARTERITIS RISK." Annals of the Rheumatic Diseases 82, Suppl 1 (2023): 1266.3–1267. http://dx.doi.org/10.1136/annrheumdis-2023-eular.2887.

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BackgroundGut microbiota (GM) abundance is associated with giant cell arteritis, but their causality remains unclear[1].ObjectivesIn order to comprehensively investigate the causal relationship between gut microbiota abundance and giant cell arteritis risk and to identify specific beneficial or pathogenic microbe taxa, we performed a two-sample Mendelian randomized (MR) analysis.MethodsMR analysis was conducted on genome-wide association study (GWAS) summary statistics of gut microbiota abundance and giant cell arteritis. Specifically, the microbiome GWAS in 14,306 individuals from the MiBioGe

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de Menezes, Alexandre B., Miranda T. Prendergast-Miller, Pabhon Poonpatana, et al. "C/N Ratio Drives Soil Actinobacterial Cellobiohydrolase Gene Diversity." Applied and Environmental Microbiology 81, no. 9 (2015): 3016–28. http://dx.doi.org/10.1128/aem.00067-15.

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ABSTRACTCellulose accounts for approximately half of photosynthesis-fixed carbon; however, the ecology of its degradation in soil is still relatively poorly understood. The role of actinobacteria in cellulose degradation has not been extensively investigated despite their abundance in soil and known cellulose degradation capability. Here, the diversity and abundance of the actinobacterial glycoside hydrolase family 48 (cellobiohydrolase) gene in soils from three paired pasture-woodland sites were determined by using terminal restriction fragment length polymorphism (T-RFLP) analysis and clone

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L. Linsky, Jeffrey, and Brian E. Wood. "Deuterium Abundance in the Local ISM." Symposium - International Astronomical Union 187 (2002): 75–79. http://dx.doi.org/10.1017/s0074180900113762.

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Excellent HST/GHRS spectra of interstellar hydrogen and deuterium Lyman-α absorption toward nearby stars allow us to identify systematic errors that have plagued earlier work and to measure accurate values of the D/H ratio in local interstellar gas. Analysis of 12 sightlines through the Local Interstellar Cloud leads to a mean value of D/H = (1.50 ± 0.10) x 10−5 with all data points lying within ±1σ of the mean. Deciding whether or not the D/H ratio has different values elsewhere in the Galaxy and beyond will be one of the major objectives of the FUSE mission.

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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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Reggiani, Henrique, and Jorge Meléndez. "Comparison of errors between a differential and a classical abundance analysis." Canadian Journal of Physics 95, no. 9 (2017): 855–57. http://dx.doi.org/10.1139/cjp-2016-0877.

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The differential abundance analysis method can improve the precision of stellar chemical abundances. The method compares the equivalent widths of a certain line in a star with the same line in a star considered to be a standard representative of its class, using high resolution and high signal to noise ratio spectra. The method has achieved great results by reducing the measurement errors to unprecedentedly low levels. However, to date, there has not been a consistent analysis on the actual improvements of this method when compared to a classical analysis in metal-poor stars. Here we present a

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Toyoda, Sakae, and Naohiro Yoshida. "Development of automated preparation system for isotopocule analysis of N<sub>2</sub>O in various air samples." Atmospheric Measurement Techniques 9, no. 5 (2016): 2093–101. http://dx.doi.org/10.5194/amt-9-2093-2016.

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Abstract. Nitrous oxide (N2O), an increasingly abundant greenhouse gas in the atmosphere, is the most important stratospheric ozone-depleting gas of this century. Natural abundance ratios of isotopocules of N2O, NNO molecules substituted with stable isotopes of nitrogen and oxygen, are a promising index of various sources or production pathways of N2O and of its sink or decomposition pathways. Several automated methods have been reported to improve the analytical precision for the isotopocule ratio of atmospheric N2O and to reduce the labor necessary for complicated sample preparation procedur

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Sitnova, T. M., L. I. Mashonkina, A. M. Tatarnikov, et al. "The formation of the milky way halo and its dwarf satellites: a NLTE-1D abundance analysis. IV. Segue 1, Triangulum ii, and Coma Berenices UFDs." Monthly Notices of the Royal Astronomical Society 504, no. 1 (2021): 1183–200. http://dx.doi.org/10.1093/mnras/stab786.

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ABSTRACT We present atmospheric parameters and abundances for chemical elements from carbon to barium in metal-poor stars in Segue 1 (seven stars), Coma Berenices (three stars), and Triangulum ii (one star) ultrafaint dwarf galaxies (UFDs). The effective temperatures rely on new photometric observations in the visible and infra-red bands, obtained with the 2.5 m telescope of the SAI MSU Caucasian observatory. Abundances of up to fourteen chemical elements were derived under the non-local thermodynamic equilibrium (NLTE) line formation, and LTE abundances were obtained for up to five more eleme

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Monaco, L., S. Villanova, G. Carraro, A. Mucciarelli, and C. Moni Bidin. "Chemical abundance analysis of red giant branch stars in the globular cluster E3." Astronomy & Astrophysics 616 (August 2018): A181. http://dx.doi.org/10.1051/0004-6361/201832979.

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Context. Globular clusters are known to host multiple stellar populations, which are a signature of their formation process. The globular cluster E3 is one of the few low-mass globulars that is thought not to host multiple populations. Aims. We investigate red giant branch stars in E3 with the aim of providing a first detailed chemical inventory for this cluster, we determine its radial velocity, and we provide additional insights into the possible presence of multiple populations in this cluster. Methods. We obtained high-resolution FLAMES-UVES/VLT spectra of four red giant branch stars likel

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Dreizler, S., K. Werner, and U. Heber. "Analysis of hydrogen rich PG 1159 central stars of Planetary Nebulae." Symposium - International Astronomical Union 180 (1997): 103. http://dx.doi.org/10.1017/s0074180900129924.

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The PG 1159 stars represent the hottest stage of post-AGB evolution. Quantitative spectral analyses of most known PG 1159 stars have been carried out by us from optical, UV and EUV observations (see Dreizler et al 1995 for a review). It has been shown that these stars have atmospheres dominated by C and He with a significant admixture of O. These abundances reveal the inter–shell matter of a former AGB star. The four stars, HS 2324+3944, NGC 7094, Abell 43, and Sh 2-68, define a small group of peculiar PG 1159 stars (termed hybrid PG 1159). Unlike all other PG 1159 stars hydrogen is detected i

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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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Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "LC-MS Based Isotopic Abundance Ratio Analysis of the Consciousness Energy Treated L-Cysteine." Scholarly Journal of Food and Nutrition (SJFN) 3, no. 5 (2021): 408–14. https://doi.org/10.32474/SJFN.2021.03.000172.

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L-cysteine is a non-essential amino acid but may be essential for new-borns, the elderly, and individuals with specific metabolic disease or malabsorption syndromes. In this study the impact of the Trivedi Effect® on the isotopic abundance ratios of L-cysteine using LC-MS analytical techniques were analysed. The test sample L-cysteine was divided into Control and the Biofield Energy Treated sample. The treated L-cysteine sample received Biofield Energy Treatment (the Trivedi Effect®) remotely for ~3 minutes by Mr. Mahendra Kumar Trivedi, who was located in the USA, while the test samples were

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Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "LC-MS Based Isotopic Abundance Ratio Analysis of the Consciousness Energy Treated L-Cysteine." Scholarly Journal of Food and Nutrition (SJFN) 3, no. 5 (2021): 408–14. https://doi.org/10.5281/zenodo.10260138.

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L-cysteine is a non-essential amino acid but may be essential for new-borns, the elderly, and individuals with specific metabolic disease or malabsorption syndromes. In this study the impact of the Trivedi Effect® on the isotopic abundance ratios of L-cysteine using LC-MS analytical techniques were analysed. The test sample L-cysteine was divided into Control and the Biofield Energy Treated sample. The treated L-cysteine sample received Biofield Energy Treatment (the Trivedi Effect®) remotely for ~3 minutes by Mr. Mahendra Kumar Trivedi, who was located in the USA, while the test samples were

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Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "LC-MS Based Isotopic Abundance Ratio Analysis of the Consciousness Energy Treated L-Cysteine." Scholarly Journal of Food and Nutrition (SJFN) 3, no. 5 (2021): 408–14. https://doi.org/10.5281/zenodo.10260140.

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L-cysteine is a non-essential amino acid but may be essential for new-borns, the elderly, and individuals with specific metabolic disease or malabsorption syndromes. In this study the impact of the Trivedi Effect® on the isotopic abundance ratios of L-cysteine using LC-MS analytical techniques were analysed. The test sample L-cysteine was divided into Control and the Biofield Energy Treated sample. The treated L-cysteine sample received Biofield Energy Treatment (the Trivedi Effect®) remotely for ~3 minutes by Mr. Mahendra Kumar Trivedi, who was located in the USA, while the test samples were

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Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "A Comprehensive Study of Isotopic Abundance Ratio Analysis of the Consciousness Energy Healing Treated Berberine Chloride Using LC-MS and GC-MS." Open Access Journal of Complementary & Alternative Medicine (OAJCAM) 3, no. 1 (2021): 282–89. https://doi.org/10.5281/zenodo.10276311.

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Berberine is an alkaloid class of drug which has enormous therapeutic potential, but the bioavailability is very poor (<1%) due to its low solubility and poor intestinal absorption. In this study, the influence of the Trivedi Effect® on the structural properties and the isotopic abundance ratio of berberine chloride was evaluated using LC-MS and GC-MS analytical techniques. Berberine chloride sample was divided into control and treated parts. Only the treated part was received the Trivedi Effect®-Consciousness Energy Healing Treatment remotely by a well-known Biofield Energy Healer, Mahendr

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Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "A Comprehensive Study of Isotopic Abundance Ratio Analysis of the Consciousness Energy Healing Treated Berberine Chloride Using LC-MS and GC-MS." Open Access Journal of Complementary & Alternative Medicine (OAJCAM) 3, no. 1 (2021): 282–89. https://doi.org/10.5281/zenodo.10276309.

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Berberine is an alkaloid class of drug which has enormous therapeutic potential, but the bioavailability is very poor (<1%) due to its low solubility and poor intestinal absorption. In this study, the influence of the Trivedi Effect® on the structural properties and the isotopic abundance ratio of berberine chloride was evaluated using LC-MS and GC-MS analytical techniques. Berberine chloride sample was divided into control and treated parts. Only the treated part was received the Trivedi Effect®-Consciousness Energy Healing Treatment remotely by a well-known Biofield Energy Healer, Mahendr

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44

Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "A Comprehensive Study of Isotopic Abundance Ratio Analysis of the Consciousness Energy Healing Treated Berberine Chloride Using LC-MS and GC-MS." Open Access Journal of Complementary & Alternative Medicine (OAJCAM) 3, no. 1 (2021): 282–89. https://doi.org/10.32474/OAJCAM.2021.03.000152.

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Berberine is an alkaloid class of drug which has enormous therapeutic potential, but the bioavailability is very poor (<1%) due to its low solubility and poor intestinal absorption. In this study, the influence of the Trivedi Effect® on the structural properties and the isotopic abundance ratio of berberine chloride was evaluated using LC-MS and GC-MS analytical techniques. Berberine chloride sample was divided into control and treated parts. Only the treated part was received the Trivedi Effect®-Consciousness Energy Healing Treatment remotely by a well-known Biofield Energy Healer, Mahendr

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45

Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "The Consciousness Energy Healing Treatment and Its Impact on the Isotopic Abundance Ratio Analysis of Flutamide." Drug Designing & Intellectual Properties International Journal (DDIPIJ) 3, no. 5 (2021): 427–39. https://doi.org/10.5281/zenodo.10275695.

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Flutamide is used to treat prostate cancer, which acts by blocking the action of exogenous testosterone binding through its androgen receptor. This study was designed and performed to investigate the impact of the Trivedi Effect® - Consciousness Energy Healing Treatment on the structural properties and the isotopic abundance ratio of flutamide using LC-MS and GC-MS spectroscopy. Flutamide sample was divided into control and treated parts. Only the treated flutamide received the Trivedi Effect® - Consciousness Energy Healing Treatment remotely by a famous Biofield Energy Healer, Mahendra Kumar

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46

Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "The Consciousness Energy Healing Treatment and Its Impact on the Isotopic Abundance Ratio Analysis of Flutamide." Drug Designing & Intellectual Properties International Journal (DDIPIJ) 3, no. 5 (2021): 427–39. https://doi.org/10.5281/zenodo.10275693.

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Flutamide is used to treat prostate cancer, which acts by blocking the action of exogenous testosterone binding through its androgen receptor. This study was designed and performed to investigate the impact of the Trivedi Effect® - Consciousness Energy Healing Treatment on the structural properties and the isotopic abundance ratio of flutamide using LC-MS and GC-MS spectroscopy. Flutamide sample was divided into control and treated parts. Only the treated flutamide received the Trivedi Effect® - Consciousness Energy Healing Treatment remotely by a famous Biofield Energy Healer, Mahendra Kumar

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47

Trivedi, Mahendra Kumar, Dahryn Trivedi, Alice Branton, and Snehasis Jana. "The Consciousness Energy Healing Treatment and Its Impact on the Isotopic Abundance Ratio Analysis of Flutamide." Drug Designing & Intellectual Properties International Journal (DDIPIJ) 3, no. 5 (2021): 427–39. https://doi.org/10.32474/DDIPIJ.2021.03.000175.

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Flutamide is used to treat prostate cancer, which acts by blocking the action of exogenous testosterone binding through its androgen receptor. This study was designed and performed to investigate the impact of the Trivedi Effect® - Consciousness Energy Healing Treatment on the structural properties and the isotopic abundance ratio of flutamide using LC-MS and GC-MS spectroscopy. Flutamide sample was divided into control and treated parts. Only the treated flutamide received the Trivedi Effect® - Consciousness Energy Healing Treatment remotely by a famous Biofield Energy Healer, Mahendra Kumar

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Tsujimoto, T., Y. Yoshii, and K. Kawara. "Age Problem Based on the Abundance Ratio from a High-Redshift QSO." Symposium - International Astronomical Union 187 (2002): 153–57. http://dx.doi.org/10.1017/s0074180900113877.

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The age of a high-redshift QSO can constrain the cosmology by placing a limit on the cosmological time. We use the observed FeII (UV+optical)/MgIIλ2798 flux ratio from the broad-line gas of a QSO at z=3.62 to estimate the abundance ratio [Mg/Fe] and predict that the QSO is at least 1.3 Gyr old from the chemical analysis using the abundance ratio [Mg/Fe] as a cosmic clock. Our result favors a nonzero cosmological constant and thus conflicts with a flat, matter-dominated universe.

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Fedele, D., and C. Favre. "Measuring elemental abundance ratios in protoplanetary disks at millimeter wavelengths." Astronomy & Astrophysics 638 (June 2020): A110. http://dx.doi.org/10.1051/0004-6361/202037927.

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Over million years of evolution, gas dust and ice in protoplanetary disks can be chemically reprocessed. There is evidence that the gas-phase carbon and oxygen abundances are subsolar in disks belonging to nearby star forming regions. These findings have a major impact on the composition of the primary atmosphere of giant planets (but it may also be valid for super-Earths and sub-Neptunes) as they accrete their gaseous envelopes from the surrounding material in the disk. In this study, we performed a thermochemical modeling analysis with the aim of testing how reliable and robust are the estim

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Fu, Zengyan, Zhenhong Jiang, Fei Zhao, Tao Gou, and Le Jiang. "Causal association between gastroesophageal reflux disease and sepsis, and the mediating role of gut bacterial abundance, a Mendelian randomization study." Medicine 104, no. 8 (2025): e41631. https://doi.org/10.1097/md.0000000000041631.

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Gastroesophageal reflux disease (GERD), akin to sepsis, is mediated by inflammatory reactions and exhibits a strong correlation with intestinal dysbiosis. We sought to examine whether these associations reflect causality using the Mendelian randomization (MR) mediation analysis. Genetic data were obtained from genome-wide association studies. Two-sample MR were performed to evaluate the causal association, accompanied by sensitivity analyses. Reverse direction MR was undertaken to assess the potential for reverse causation. Then, mediation analysis was performed to evaluate the mediating effec

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