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Artykuły w czasopismach na temat "Isotopic Abundance Ratio Analysis"
1
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.
Pełny tekst źródłaStreszczenie:
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 isotopic reference materials were produced for isotope-delta measurements of seven elements: H, Li, B, C, N, O, and S. The number of isotopic reference materials for other, heavier elements has grown considerably over the last decade. Nevertheless, even primary international measurement standards for isotope-delta measurements are still needed for some elements, including Mg, Fe, Te, Sb, Mo, and Ge. It is recommended that authors publish the delta values of internationally distributed, secondary isotopic reference materials that were used for anchoring their measurement results to the respective primary stable isotope scale.
2
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.
Pełny tekst źródłaStreszczenie:
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 and another part was referred as biofield energy treated sample that was given Mr. Trivediꞌs unique biofield energy. T1, T2, T3, and T4 were represented to different time interval analysis of the biofield treated thymol. The GC-MS spectra of the both control and biofield treated thymol indicated the presence of molecular ion peak [M+] at m/z 150 (calculated 150.10 for C10H14O) along with the similar pattern of fragmentation. The relative intensities of the parent molecule and other fragmented ions of the biofield treated thymol were enhanced as compared to the control thymol. The percentage change of the isotopic abundance ratio of PM+1/PM in the biofield treated thymol at T1, T2, T3 and T4 was increased by 3.25, 6.31, 96.75, and 140.25%, respectively as compared to the control thymol. In addition, the percentage change of the isotopic abundance ratio of PM+2/PM was increased in the biofield treated thymol at T1, T2, T3, and T4 by 5.33, 8.00, 101.33, and 140.00%, respectively with respect to the control sample. In summary, 13C, 2H, and 17O contributions from (C10H14O)+ to m/z 151 and 18O contribution from (C10H14O)+ to m/z 152 in the biofield treated thymol were significantly increased gradually with respect to the time and was found that biofield energy treatment has time dependent effect on it. Hence, the biofield energy treated thymol might display altered isotope effects such as physicochemical and thermal properties, binding energy and the reaction kinetics with respect to the control sample. So, biofield energy treated thymol could be advantageous for designing the synthetic scheme for the preparation of pharmaceuticals through its kinetic isotope effects. Besides, biofield treated thymol might be useful to overcome the problems associated with thymol for e.g. pungent flavor, high dose requirement for the activity through understanding its isotope effects and the determination of its pharmacokinetic profile, bioavailability. <strong>Source:</strong> https://www.trivedieffect.com/science/mass-spectrometric-analysis-of-isotopic-abundance-ratio-in-biofield-energy-treated-thymol http://www.sciencepublishinggroup.com/journal/paperinfo?journalid=206&doi=10.11648/j.wjac.20160101.11
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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.
Pełny tekst źródłaStreszczenie:
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 and another part was referred as biofield energy treated sample that was given Mr. Trivediꞌs unique biofield energy. T1, T2, T3, and T4 were represented to different time interval analysis of the biofield treated thymol. The GC-MS spectra of the both control and biofield treated thymol indicated the presence of molecular ion peak [M+] at m/z 150 (calculated 150.10 for C10H14O) along with the similar pattern of fragmentation. The relative intensities of the parent molecule and other fragmented ions of the biofield treated thymol were enhanced as compared to the control thymol. The percentage change of the isotopic abundance ratio of PM+1/PM in the biofield treated thymol at T1, T2, T3 and T4 was increased by 3.25, 6.31, 96.75, and 140.25%, respectively as compared to the control thymol. In addition, the percentage change of the isotopic abundance ratio of PM+2/PM was increased in the biofield treated thymol at T1, T2, T3, and T4 by 5.33, 8.00, 101.33, and 140.00%, respectively with respect to the control sample. In summary, 13C, 2H, and 17O contributions from (C10H14O)+ to m/z 151 and 18O contribution from (C10H14O)+ to m/z 152 in the biofield treated thymol were significantly increased gradually with respect to the time and was found that biofield energy treatment has time dependent effect on it. Hence, the biofield energy treated thymol might display altered isotope effects such as physicochemical and thermal properties, binding energy and the reaction kinetics with respect to the control sample. So, biofield energy treated thymol could be advantageous for designing the synthetic scheme for the preparation of pharmaceuticals through its kinetic isotope effects. Besides, biofield treated thymol might be useful to overcome the problems associated with thymol for e.g. pungent flavor, high dose requirement for the activity through understanding its isotope effects and the determination of its pharmacokinetic profile, bioavailability. https://www.trivedieffect.com/science/mass-spectrometric-analysis-of-isotopic-abundance-ratio-in-biofield-energy-treated-thymol http://www.sciencepublishinggroup.com/journal/paperinfo?journalid=206&doi=10.11648/j.wjac.20160101.11
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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.
Pełny tekst źródłaStreszczenie:
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 abundances for isotopes of C, O, and Si. Results. Fits of synthetic spectra of the 12C16O first overtone bands at 2.3 μm computed with three available line lists to the observed spectrum of Arcturus provide the same carbon abundance [C] = − 0.6 and isotopic ratio of carbon 12C/13C = 10 ± 2. However, the quality of fits to the observed spectrum differ for three line lists used. Furthermore, the derived oxygen isotopic ratio 16O/18O = 2000 ± 500 is larger than that known in the solar system, where 16O/18O = 500. The silicon isotopic ratio in the atmosphere of the red giant HD 196610 has been revised. Using the ExoMol SiO line list with appropriate statistical weights for the SiO isotopologues, the “non-solar” ratio 28Si:29Si:30Si = 0.86 ± 0.03:0.12 ± 0.02:0.02 ± 0.01 is obtained. Conclusions. We find that: (a) the computed isotopic carbon and silicon ratios determined by the fits to the observed spectrum depend on the adopted abundance of C and Si, respectively; and (b) Correct treatment of the nuclear spin degeneracies parameter is of crucial importance for today’s application of HITRAN and ExoMol line lists in the astrophysical computations.
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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.
Pełny tekst źródłaStreszczenie:
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 parts - one part was denoted as control and another part was referred as biofield energy treated sample that was received through Mr. Trivediꞌs unique biofield energy (The Trivedi Effect®). The GC-MS of the biofield treated TMB was characterized at different time intervals considered as T1, T2, T3, and T4 to examine the impact of the biofield energy treatment on isotopic abundance ratio with respect to the time. The GC-MS spectra of the both control and biofield treated TMB exhibited the presence of molecular ion peak [M+] at m/z 168 (calculated 168.08 for C9H12O3) along with similar pattern of fragmentation. The relative peak intensities of the fragmented ions in the biofield treated TMB, particularly at T2 and T3 was altered from the control sample. The isotopic abundance ratio analysis in the biofield treated TMB exhibited that the isotopic abundance ratio of PM+1/PM in the biofield treated TMB at T2 and T3 was significantly enhanced by 128.13 and 117.99%, respectively with respect to the control sample. Consequently, the percentage change in isotopic abundance ratio of PM+2/PM was significantly increased in the biofield treated TMB at T2 and T3 by 125.93 and 116.67%, respectively as compared with the control TMB. The isotopic abundance ratios (PM+1/PM and PM+2/PM) in the biofield treated TMB at T1 and T4 was altered with respect to the control TMB. In summary, 13C, 2H, and 17O contributions from (C9H12O3)+ to m/z 169 and 18O contribution from (C9H12O3)+ to m/z 170 for the biofield treated TMB, particularly at T2 and T3 were significantly improved and biofield treated TMB might exhibit changed isotope effects as compared to the control sample. The biofield treated TMB might assist to develop new chemicals and pharmaceuticals through using its kinetic isotope effects like understanding the reaction mechanism, the enzymatic transition state and all aspects of enzyme mechanisms. <strong>Source:</strong> https://www.trivedieffect.com/science/isotopic-abundance-ratio-analysis-of-123-trimethoxybenzene-tmb-after-biofield-energy-treatment-the-trivedi-effect-using-gas-chromatography-mass-spectrometry http://www.sciencepublishinggroup.com/journal/paperinfo?journalid=227&doi=10.11648/j.ajac.20160404.13
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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.
Pełny tekst źródłaStreszczenie:
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 parts - one part was denoted as control and another part was referred as biofield energy treated sample that was received through Mr. Trivediꞌs unique biofield energy (The Trivedi Effect®). The GC-MS of the biofield treated TMB was characterized at different time intervals considered as T1, T2, T3, and T4 to examine the impact of the biofield energy treatment on isotopic abundance ratio with respect to the time. The GC-MS spectra of the both control and biofield treated TMB exhibited the presence of molecular ion peak [M+] at m/z 168 (calculated 168.08 for C9H12O3) along with similar pattern of fragmentation. The relative peak intensities of the fragmented ions in the biofield treated TMB, particularly at T2 and T3 was altered from the control sample. The isotopic abundance ratio analysis in the biofield treated TMB exhibited that the isotopic abundance ratio of PM+1/PM in the biofield treated TMB at T2 and T3 was significantly enhanced by 128.13 and 117.99%, respectively with respect to the control sample. Consequently, the percentage change in isotopic abundance ratio of PM+2/PM was significantly increased in the biofield treated TMB at T2 and T3 by 125.93 and 116.67%, respectively as compared with the control TMB. The isotopic abundance ratios (PM+1/PM and PM+2/PM) in the biofield treated TMB at T1 and T4 was altered with respect to the control TMB. In summary, 13C, 2H, and 17O contributions from (C9H12O3)+ to m/z 169 and 18O contribution from (C9H12O3)+ to m/z 170 for the biofield treated TMB, particularly at T2 and T3 were significantly improved and biofield treated TMB might exhibit changed isotope effects as compared to the control sample. The biofield treated TMB might assist to develop new chemicals and pharmaceuticals through using its kinetic isotope effects like understanding the reaction mechanism, the enzymatic transition state and all aspects of enzyme mechanisms. https://www.trivedieffect.com/science/isotopic-abundance-ratio-analysis-of-123-trimethoxybenzene-tmb-after-biofield-energy-treatment-the-trivedi-effect-using-gas-chromatography-mass-spectrometry http://www.sciencepublishinggroup.com/journal/paperinfo?journalid=227&doi=10.11648/j.ajac.20160404.13
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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.
Pełny tekst źródłaStreszczenie:
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 intervals and were symbolized as T1, T2, T3, and T4 to understand the effect of the biofield energy on isotopic abundance ratio with respect to the time. From the GC-MS spectra, the presence of the molecular ion peak C8H7N+ (m/z 117) along with major fragmented peaks C7H6+ (m/z 90), C7H5+ (m/z 89), C5H3+ (m/z 63), C4H2+ (m/z 50), C3H3+ (m/z 39), and C2H4 (m/z 28) were observed in both control and biofield treated samples. Only, the relative peak intensities of the fragmented ions in the biofield treated indole was notably changed as compared to the control sample with respect to the time. The isotopic abundance ratio analysis of indole using GC-MS revealed that the isotopic abundance ratio of PM+1/PM in the biofield energy treated indole at T1 and T2 was significantly decreased by 44.28 and 28.18% as compared to the control sample. On the contrary, the isotopic abundance ratio of PM+1/PM in the biofield energy treated sample at T3 and T4, was significantly increased by 41.22 and 180.88%, respectively as compared to the control sample. Overall, the isotopic abundance ratio of PM+1/PM (2H/1H or 13C/12C or 15N/14N) was significantly altered in the biofield energy treated indole as compared to the control with respect to the time. The biofield treated indole with the altered isotopic abundance ratio might have altered the physicochemical properties and rate of reaction. This biofield energy treated indole might be more useful as a chemical intermediate in the production of pharmaceuticals, chemicals, plastics, dyes, and perfumes. <strong>Source:</strong> https://www.trivedieffect.com/science/isotopic-abundance-ratio-analysis-of-biofield-energy-treated-indole-using-gas-chromatography-mass-spectrometry http://www.sciencepublishinggroup.com/journal/paperinfo?journalid=125&doi=10.11648/j.sjc.20160404.11
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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.
Pełny tekst źródłaStreszczenie:
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 intervals and were symbolized as T1, T2, T3, and T4 to understand the effect of the biofield energy on isotopic abundance ratio with respect to the time. From the GC-MS spectra, the presence of the molecular ion peak C8H7N+ (m/z 117) along with major fragmented peaks C7H6+ (m/z 90), C7H5+ (m/z 89), C5H3+ (m/z 63), C4H2+ (m/z 50), C3H3+ (m/z 39), and C2H4 (m/z 28) were observed in both control and biofield treated samples. Only, the relative peak intensities of the fragmented ions in the biofield treated indole was notably changed as compared to the control sample with respect to the time. The isotopic abundance ratio analysis of indole using GC-MS revealed that the isotopic abundance ratio of PM+1/PM in the biofield energy treated indole at T1 and T2 was significantly decreased by 44.28 and 28.18% as compared to the control sample. On the contrary, the isotopic abundance ratio of PM+1/PM in the biofield energy treated sample at T3 and T4, was significantly increased by 41.22 and 180.88%, respectively as compared to the control sample. Overall, the isotopic abundance ratio of PM+1/PM (2H/1H or 13C/12C or 15N/14N) was significantly altered in the biofield energy treated indole as compared to the control with respect to the time. The biofield treated indole with the altered isotopic abundance ratio might have altered the physicochemical properties and rate of reaction. This biofield energy treated indole might be more useful as a chemical intermediate in the production of pharmaceuticals, chemicals, plastics, dyes, and perfumes. https://www.trivedieffect.com/science/isotopic-abundance-ratio-analysis-of-biofield-energy-treated-indole-using-gas-chromatography-mass-spectrometry http://www.sciencepublishinggroup.com/journal/paperinfo?journalid=125&doi=10.11648/j.sjc.20160404.11
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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.
Pełny tekst źródłaStreszczenie:
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 considered as biofield energy treated sample which was received the biofield energy treatment through the unique biofield energy transmission process by Mr. Mahendra Kumar Trivedi (also known as The Trivedi Effect®). The biofield energy treated nerolin was analyzed at different time intervals and were represented as T1, T2, T3, and T4 in order to understand the effect of the biofield energy treatment on isotopic abundance ratio with respect to the time. From the GC-MS spectral analysis, the presence of the molecular ion peak C11H10O+ (m/z 158) along with major fragmented peaks C10H7O- (m/z 143), C10H8 (m/z 128), C9H7+ (m/z 115), C7H5+ (m/z 89), C5H3+ (m/z 63), C4H3+ (m/z 51), and C3H3+ (m/z 39) were observed in both control and biofield treated samples. Only, the relative peak intensities of the fragmented ions in the biofield treated nerolin was notably changed as compared to the control sample with respect to the time. The isotopic abundance ratio analysis of nerolin using GC-MS revealed that the isotopic abundance ratio of PM+1/PM in the biofield energy treated nerolin at T1, T2, T3, and T4 was increased by 2.38, 138.10, 13.10, and 32.14%, as compared to the control sample. Likewise, the isotopic abundance ratio of PM+2/PM at T1, T2, T3, and T4 was increased by 2.38, 138.10, 13.10, and 32.14%, respectively in the biofield treated nerolin as compared to the control sample. Overall, the isotopic abundance ratios of PM+1/PM (2H/1H or 13C/12C or 17O/16O) and PM+2/PM (18O/16O) were significantly increased in the biofield energy treated sample as compared to the control sample with respect to the time. It is concluded that Mr. Trivedi’s biofield energy treatment has the significant impact on alteration in isotopic abundance of nerolin as compared to the control sample. The biofield treated nerolin might display different altered physicochemical properties and rate of reaction and could be an important intermediate for the production of pharmaceuticals, chemicals, and perfumes in the industry. <strong>Source:</strong> https://www.trivedieffect.com/science/gas-chromatography-mass-spectrometry-based-isotopic-abundance-ratio-analysis-of-biofield-energy-treated-methyl-2-napthylether-nerolin http://www.sciencepublishinggroup.com/journal/paperinfo?journalid=128&doi=10.11648/j.ajpc.20160504.11
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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.
Pełny tekst źródłaStreszczenie:
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 considered as biofield energy treated sample which was received the biofield energy treatment through the unique biofield energy transmission process by Mr. Mahendra Kumar Trivedi (also known as The Trivedi Effect®). The biofield energy treated nerolin was analyzed at different time intervals and were represented as T1, T2, T3, and T4 in order to understand the effect of the biofield energy treatment on isotopic abundance ratio with respect to the time. From the GC-MS spectral analysis, the presence of the molecular ion peak C11H10O+ (m/z 158) along with major fragmented peaks C10H7O- (m/z 143), C10H8 (m/z 128), C9H7+ (m/z 115), C7H5+ (m/z 89), C5H3+ (m/z 63), C4H3+ (m/z 51), and C3H3+ (m/z 39) were observed in both control and biofield treated samples. Only, the relative peak intensities of the fragmented ions in the biofield treated nerolin was notably changed as compared to the control sample with respect to the time. The isotopic abundance ratio analysis of nerolin using GC-MS revealed that the isotopic abundance ratio of PM+1/PM in the biofield energy treated nerolin at T1, T2, T3, and T4 was increased by 2.38, 138.10, 13.10, and 32.14%, as compared to the control sample. Likewise, the isotopic abundance ratio of PM+2/PM at T1, T2, T3, and T4 was increased by 2.38, 138.10, 13.10, and 32.14%, respectively in the biofield treated nerolin as compared to the control sample. Overall, the isotopic abundance ratios of PM+1/PM (2H/1H or 13C/12C or 17O/16O) and PM+2/PM (18O/16O) were significantly increased in the biofield energy treated sample as compared to the control sample with respect to the time. It is concluded that Mr. Trivedi’s biofield energy treatment has the significant impact on alteration in isotopic abundance of nerolin as compared to the control sample. The biofield treated nerolin might display different altered physicochemical properties and rate of reaction and could be an important intermediate for the production of pharmaceuticals, chemicals, and perfumes in the industry. https://www.trivedieffect.com/science/gas-chromatography-mass-spectrometry-based-isotopic-abundance-ratio-analysis-of-biofield-energy-treated-methyl-2-napthylether-nerolin http://www.sciencepublishinggroup.com/journal/paperinfo?journalid=128&doi=10.11648/j.ajpc.20160504.11
Rozprawy doktorskie na temat "Isotopic Abundance Ratio Analysis"
1
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 techniques analytiques différentes et (ii) l’obligation d’observer l’ensemble des carbones de la molécule analysée, ce qui n’est pas toujours possible et qui, de plus, empêche l’utilisation de séquences multi-impulsionnelles en raison de la perte de l’information des carbones quaternaires. Ces travaux de thèse portent sur le développement d’une méthode de référence interne permettant de contourner ces inconvénients. Cette méthode se base sur le développement de séquences spatialement-sélectives en RMN ¹H combinées à des analyses quantitatives de haute précision par RMN ¹³C. La première étape consiste à développer et optimiser les séquences ¹H grâce à l’analyse d’un mélange modèle. Ce nouvel outil analytique est ensuite appliqué à l’analyse isotopique de la vanilline, la justesse des mesures étant vérifiée par comparaison avec la méthode conventionnelle. Enfin, cette méthode de référence interne est appliquée à l’analyse d’échantillons d’ibuprofène de diverses origines géographiques dans le but de les discriminer à l’aide d’une séquence multiimpulsionnelle : l’INEPT<br>Position-Specific Isotope Analysis (PSIA) is a very interesting application of quantitative ¹³C NMR since it forms a powerful tool to track the origin of biological or synthetic organic molecules by giving access to the complete ¹³C intramolecular composition. Currently, the conventional method to perform PSIA using ¹³C NMR requires the combination of isotopic ratio mass spectrometry with quantitative ¹³C NMR to accurately measure absolute position-specific isotopic compositions. However, this analytical method suffers from several drawbacks: (i) it requires two different analytical techniques on the same sample, (ii) it requires to observe the signal of all the carbons of the analyzed compound, which is not always possible and thus prevents the use of multipulse sequences, the isotopic information given by quaternary carbons being lost. In this manuscript, we present the development of an internal reference method based on the use of spatially-encoded ¹H experiments combined with highly accurate quantitative ¹³C-NMR in order to improve the generality of ¹³C isotopic NMR. The first step consists in developing these new ¹H pulse sequences through the analysis of a model sample. This new analytical package is then applied to the analysis of vanillin and the trueness of these analyses is evaluated by comparing the results to those obtained with the conventional method. Finally, this internal reference method is applied to the analysis of ibuprofen samples from various geographical origins using the INEPT multipulse sequence, the objective being to discriminate them as a function of their isotopic profile
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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 understudied compared to the other proxies used for sea-level reconstructions. This disparity has led to assumptions on many aspects of the POS precipitation. Further, POS are typically composed of calcite, but sometimes the metastable polymorph aragonite is present instead. Two caves were studied because of the presence of a modern POS horizon of aragonite and calcite: Cova des Pas de Vallgornera (Vallgornera) and Coves del Drac (Drac), respectively.
High-resolution air and water physical parameters were collected for the first time, along with monthly water samples for stable isotope and elemental analysis. This 16-month record was supplemented with detailed geochemical studies throughout the project, including water-column profiles and CO2 sampling campaigns.
The water level in both caves preserves the semi-diurnal Mediterranean Sea tide signal, with a lag of approximately four hours. The fluctuation in both caves is slightly attenuated, and the direct effects of barometric pressure and precipitation could not be discerned from the primary control of tidal pumping. Calculations based on salinity and isotope analysis show that less than 20% of the solution in each cave is seawater.
Degassing of CO2 from the cave water to air was documented at both locations, with sporadic calcium carbonate supersaturation. These conditions are strongly dependent on annual cave ventilation, which becomes active during winter when cold, dense tropospheric air sinks into the subsurface. In addition to seasonal thermo-circulation, fluctuating water level displaces cave air and likely initiates tropospheric exchange throughout the year. This process primarily occurs through fissures in thin overlying bedrock at Vallgornera and through the large entrance in Drac.
Higher elemental ratios (Mg:Ca, Sr:Ca, Mg:Sr) known to enhance aragonite precipitation or inhibit calcite precipitation were recorded in Vallgornera's water. A linear correlation with salinity was not observed, so higher ratios in Vallgornera must be contributed from differences in lithology, bedrock weathering intensity, or nearby rising thermal waters.
In summary, this research confirms POS strengths as sea-level proxies from geochemical and hydrological perspectives. These carbonate encrustations are precipitated at the air-water interface, which fluctuates as an attenuated expression of Mediterranean Sea tide. Degassing of CO2 from the cave water to air, which promotes calcium carbonate supersaturation, is the major control on POS deposition, and is facilitated by winter ventilation and likely water-level fluctuations. CO2 degassing (and theoretically precipitation of POS) in isotopic equilibrium is possible in caves with restricted ventilation (small/sealed entrances, small passages). Aragonite may be precipitated instead of calcite because of local modifications to the geochemical system from bedrock weathering or contributions from deep groundwater.
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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 thesis, we measured the isotopic compositions of oxygen, hydrogen and carbon of several rice genotypes that were cultivated during the southwest monsoon in diverse climatic regions across the Indian landmass. These isotopic values were then compared with the seasonalaverage values of climate factors such as relative humidity and temperature. Together with thiswe also studied the dependency of the oxygen isotope composition of the grain OM (δ18OOM) onthat of the source water (δ18OSW). Upon removal of δ18OSW effect from δ18OOM, we obtained astrong and significant relationship between the 18O enrichment in grain organic matter (definedas 18OOM) with relative humidity. The gradient recorded was 0.45‰ shift in 18OOM with 1%change in the relative humidity level. This relationship can potentially be used to estimate thepast variations in relative humidity (and by extension, can provide a measure of monsoon rainfallvariations). We further validated this relationship based on experiments carried out in aglasshouse where all the physical factors were well-monitored. Together with this, carbonisotopic composition measured in the rice grain organic matter were used to infer the water useefficiency of rice grown in different climatic settings. The stable isotope approach was furtherimplemented for studying the archaeological rice grains recovered from archaeological sites.
Analysis of carbon isotopic composition of archaeological rice grains from seven archaeologicalsites (Balu, Kanmer, Ojiyana, Lahuradewa, JognaKhera, Hulas and Kunal), belonging to theHarappan civilization and other contemporary cultures provided a new suit of data on quantitativeestimate of the hydroclimatic condition (specifically relative humidity) and water availabilityduring the existence of this civilization.
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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.
Pełny tekst źródłaStreszczenie:
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 thesis, we measured the isotopic compositions of oxygen, hydrogen and carbon of several rice genotypes that were cultivated during the southwest monsoon in diverse climatic regions across the Indian landmass. These isotopic values were then compared with the seasonalaverage values of climate factors such as relative humidity and temperature. Together with thiswe also studied the dependency of the oxygen isotope composition of the grain OM (δ18OOM) onthat of the source water (δ18OSW). Upon removal of δ18OSW effect from δ18OOM, we obtained astrong and significant relationship between the 18O enrichment in grain organic matter (definedas 18OOM) with relative humidity. The gradient recorded was 0.45‰ shift in 18OOM with 1%change in the relative humidity level. This relationship can potentially be used to estimate thepast variations in relative humidity (and by extension, can provide a measure of monsoon rainfallvariations). We further validated this relationship based on experiments carried out in aglasshouse where all the physical factors were well-monitored. Together with this, carbonisotopic composition measured in the rice grain organic matter were used to infer the water useefficiency of rice grown in different climatic settings. The stable isotope approach was furtherimplemented for studying the archaeological rice grains recovered from archaeological sites.
Analysis of carbon isotopic composition of archaeological rice grains from seven archaeologicalsites (Balu, Kanmer, Ojiyana, Lahuradewa, JognaKhera, Hulas and Kunal), belonging to theHarappan civilization and other contemporary cultures provided a new suit of data on quantitativeestimate of the hydroclimatic condition (specifically relative humidity) and water availabilityduring the existence of this civilization
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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.
Pełny tekst źródłaStreszczenie:
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 thesis, we measured the isotopic compositions of oxygen, hydrogen and carbon of several rice genotypes that were cultivated during the southwest monsoon in diverse climatic regions across the Indian landmass. These isotopic values were then compared with the seasonalaverage values of climate factors such as relative humidity and temperature. Together with thiswe also studied the dependency of the oxygen isotope composition of the grain OM (δ18OOM) onthat of the source water (δ18OSW). Upon removal of δ18OSW effect from δ18OOM, we obtained astrong and significant relationship between the 18O enrichment in grain organic matter (definedas 18OOM) with relative humidity. The gradient recorded was 0.45‰ shift in 18OOM with 1%change in the relative humidity level. This relationship can potentially be used to estimate thepast variations in relative humidity (and by extension, can provide a measure of monsoon rainfallvariations). We further validated this relationship based on experiments carried out in aglasshouse where all the physical factors were well-monitored. Together with this, carbonisotopic composition measured in the rice grain organic matter were used to infer the water useefficiency of rice grown in different climatic settings. The stable isotope approach was furtherimplemented for studying the archaeological rice grains recovered from archaeological sites.
Analysis of carbon isotopic composition of archaeological rice grains from seven archaeologicalsites (Balu, Kanmer, Ojiyana, Lahuradewa, JognaKhera, Hulas and Kunal), belonging to theHarappan civilization and other contemporary cultures provided a new suit of data on quantitativeestimate of the hydroclimatic condition (specifically relative humidity) and water availabilityduring the existence of this civilization
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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 fatty acids from a number of red deer (Cervus elaphus) tissues, a species commonly encountered in the European archaeological record, was investigated. METHODS: Lipids were extracted from 10 modern red deer tissues obtained from the Slowinski National Park (Poland). Fatty acids were fractionated, methylated and analysed by gas chromatography/combustion/isotope ratio mass spectrometry (GCCIRMS). The delta(13)C values of n-octadecanoic acid and n-hexadecanoic acid, and the difference between these values (Delta(13)C), were compared with those from previously published ruminant fats. RESULTS: Nine of the ten deer carcass fats measured have Delta(13)C values of less than -3.3 per thousand, the threshold previously used for classifying dairy products. Despite considerable overlap, dairy fats from domesticated ruminants with Delta(13)C values less than -4.3 per thousand are still distinguishable. CONCLUSIONS: The finding has implications for evaluating pottery use and early pastoralism. The processing of deer tissues and our revised criteria should be considered, especially where there is other archaeological evidence for their consumption.
Książki na temat "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.
Znajdź pełny tekst źródłaCzęści książek na temat "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 microorganisms and transformation pathways: (1) quantitative polymerase chain reaction (qPCR) to quantify microorganisms and genes encoding enzymes for biodegradation or biotransformation, (2) DNA sequencing to comprehensively identify the microorganisms presence and microbial community structure, (3) stable isotope probing (SIP) provides conclusive evidence of biodegradation through the use of 13C-labeled surrogate compounds of petroleum hydrocarbons that microbes use as carbon and/or energy sources, and (4) compound-specific isotope analysis (CSIA) measures the ratio of naturally occurring stable isotopes within a contaminant to indicate (bio)degradation. This chapter discusses the use, benefits, and limitations of MBTs. Several real-world case studies are provided to demonstrate how to investigate the biodegradation of petroleum hydrocarbon constituents under varying field conditions to better characterize governing biogeochemical processes and to better inform remedial decisions.
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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 developed original open-source workflows based on OpenMS nodes implemented in a KNIME working environment. Here, we extend the use of the bSLIM labeling strategy in quantitative proteomics by presenting an alternative procedure to extract isotopolog intensities and process them by taking advantage of new functionalities integrated into the Minora node of Proteome Discoverer 2.4 software. We also present a graphical strategy to evaluate the statistical robustness of protein quantification scores and calculate the associated false discovery rates (FDR). We validated these approaches in a case study in which we compared the differences between the proteomes of two closely related yeast strains.
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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 principles of calibration to the appropriate isotopic scales, and how researchers can detect error and calculate uncertaintyusing duplicatesand quality control standards.
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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.
Pełny tekst źródłaStreszczenia konferencji na temat "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-invasive, miniaturized H. pylori detection tools.
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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 using high resolution optogalvanic spectroscopy for isotopic analysis has been also considered by Keller3, Tong4, Niemax5, and Edelson6.
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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 difficult to find ALA from sources with different d13C. In the first study we fed mice DHA sourced from algae (enriched in carbon 13) chronically and then switched the mice to less enriched fatty acid sources including ALA from flaxseed oil, ALA and stearidonic acid (SDA) from ahiflower oil or DHA derived from fish oil. We show that DHA tissue turnover can be measured from dietary ALA, ALA and SDA or DHA. In the second study upon chronically feeding mice DHA obtained from fish oil we switched mice to a diet either spiked with a small amount (~0.03%) of uniformly labeled DHA to increase the d13C of DHA or to DHA derived from algae. Not only could we differentiate the sources of DHA in the tissues, but the different sources of DHA produced similar tissue half lives. In conclusion, limitations in the natural variance of d13C can be circumvented by changing the d13C content of metabolic products or by adding small amounts of labelled molecules to increase the d13C content.
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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 analyses of Sr isotopes and element concentrations. The analytical results show outstanding negative shifts of oxygen isotopes in some intervals, whereas carbon and strontium isotopes have a minor or little change. These intervals also contain lower element contents including strontium. It is believed that these intervals experienced diagenetic dissolution with abundant secondary porosity, and are the best potential for oil and gas reservoirs. Petrographic study indicates minor cements but higher porosity developed within these intervals. This is confirmed by high porosity measured within these intervals by using other methods including gas injection and well logging. Furthermore, the degrees of water-rock interaction were quantitively assessed by modeling covariations of isotope pairs, which can help evaluate the quality of reservoirs relating to the intensity of diagenesis. Intensive diagenesis with a high water-rock ratio particularly in a closed system may result in additional cementation, alteration of most geochemical parameters, and also reduce porosity and permeability. Thus, the isotope technology can be utilized as an effective method to assess reservoir potential and determine reservoir sweet spots. Note that carbonate cementation and recrystallization commonly occur during diagenesis, and commonly show negative oxygen isotope values. If sampling happens to contain a certain amount of cements and recrystallized carbonate minerals, the analytical results will show lower oxygen isotopes and trace elements than their primary values in the studied marine carbonates. Petrographic study was conducted to help micro-sampling, and verify that cements were not collected in the studied carbonate rocks for isotope analysis. The implementation of this study is that the isotope results obtained from one studied well can be applied in the whole field or/and the region, as diagenesis rarely occurs only around one well. This will save cost for repeatedly measurements from different wells and fields by using other methods.
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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 resonance broadening of Al, Zr, Mg and O elements. For the same Inert Matrix, Reactor Grade Plutonium (RG-Pu) IMF fuels have more negative Doppler Coefficients than Weapon Grade Plutonium (WG-Pu) IMF fuels, which induce by the more abundance of resonance isotopes 240Pu, 242Pu in RG-Pu. Since the different neutron absorption cross-section profiles, the Er2O3 burnable poison has negative contribution to the Doppler Coefficient, however 10B, a typical 1/v absorber, is on the contrary way.
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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 incorporate into the data analysis programs, the Gaussian and Lorentzian parts of the instrument response function (IRF). A technique to minimize the Gaussian part of the IRF has been developed to remove spectral drift prior to spectrum coadding.
Raporty organizacyjne na temat "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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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 concentration of SO4. Several trace elements also showed small trends of both increasing and decreasing concentrations over time. There was a strong correlation between Ca and Mg concentrations in both the Fox Creek region samples and Three Hills region samples, which is an indication of the mixing of formation water. However, the correlation between B and Sr was different among two region samples, which is likely due to the delayed mixing of formation water with the fracturing fluids during the flowback at different time periods of post fracturing. Likewise, Fox Creek region samples showed correlations between concentrations of Cl and Ca, Na and Ca, and Na and Mg, but these correlations were not seen in the Three Hills region samples. Geochemical modeling demonstrates that there are potential scales formed in the flowback water, but most of the minerals are still in the dissolution state in the formation. Stable isotopic analysis confirmed the mixing of injection water and the formation water.