Journal articles: 'Chemistry, Analytic'

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Bandeen-Roche, Karen J. "Quality Control in Analytic Chemistry." Technometrics 37, no. 1 (February 1995): 115–16. http://dx.doi.org/10.1080/00401706.1995.10485897.

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Vigren, Erik. "Analytic model of comet ionosphere chemistry." Astronomy & Astrophysics 616 (August 2018): A59. http://dx.doi.org/10.1051/0004-6361/201832704.

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Context. We consider a weakly to moderately active comet and make the following simplifying assumptions: (i) The partial ionization frequencies are constant throughout the considered part of the coma. (ii) All species move radially outward with the same constant speed. (iii) Ion-neutral reactions affect the chemical composition of the ions, but ion removal through dissociative recombination with free electrons is negligible. Aims. We aim to derive an analytical model for the radial variation of the abundances of various cometary ions. Methods. We present two methods for retrieving the ion composition as a function of r. The first method, which has previously been used frequently, solves a series of coupled differential equations. The new method introduced here is based on probabilistic arguments and is analytical in nature. Results. For a pure H2O coma, the resulting closed-form expressions yield results that are identical to the standard method, but are computationally much less expensive. Conclusions. In addition to the computational simplicity, the analytical model provides insight into how the various abundances depend on parameters such as comet production rate, outflow speed, and reaction rate coefficients. It can also be used to investigate limiting cases. It cannot easily be extended to account for a radially varying flow speed or dissociative recombination in the way a code based on numerical integrations can.

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Burns, M. A. "ANALYTIC CHEMISTRY: Everyone's a (Future) Chemist." Science 296, no. 5574 (June 7, 2002): 1818–19. http://dx.doi.org/10.1126/science.1073562.

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Vlacholia, Maria, Stella Vosniadou, Petros Roussos, Katerina Salta, Smaragda Kazi, Michael Sigalas, and Chryssa Tzougraki. "Changes in visual/spatial and analytic strategy use in organic chemistry with the development of expertise." Chemistry Education Research and Practice 18, no. 4 (2017): 763–73. http://dx.doi.org/10.1039/c7rp00036g.

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We present two studies that investigated the adoption of visual/spatial and analytic strategies by individuals at different levels of expertise in the area of organic chemistry, using the Visual Analytic Chemistry Task (VACT). The VACT allows the direct detection of analytic strategy use without drawing inferences about underlying mental processes. The first study examined the psychometric properties of the VACT and revealed a structure consistent with the hypothesis that it consists of two sub-scales: visual/spatial and analytic. The second study investigated the performance of 285 participants with various levels of expertise in organic chemistry on the VACT. The results showed that the adoption of analytic strategies in organic chemistry, and specifically in molecular structure, was difficult and was systematically used only by the more expert participants. The implications of this research for the teaching of chemistry are discussed.

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Cheng, Lan, Stella Stopkowicz, and Jürgen Gauss. "Analytic energy derivatives in relativistic quantum chemistry." International Journal of Quantum Chemistry 114, no. 17 (February 24, 2014): 1108–27. http://dx.doi.org/10.1002/qua.24636.

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Henderson, Andrea. "Atomic Individuals." Representations 159, no. 1 (2022): 122–50. http://dx.doi.org/10.1525/rep.2022.159.5.122.

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Victorian chemistry and Victorian political theory are both constructed around a foundational analytic unit: for the former, it is the atom, and for the latter, the individual. Because the latter construct was actually the more robust of the two, Victorian chemists used the resources of art and literature to lend individuality to atoms, while literary writers used chemistry to suggest that the category of the individual might be no more than a fiction of liberal theory.

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Amos, Roger D., and Julia E. Rice. "Implementation of analytic derivative methods in quantum chemistry." Computer Physics Reports 10, no. 4 (September 1989): 147–87. http://dx.doi.org/10.1016/0167-7977(89)90001-4.

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Gyung Kim, Mi. "The Analytic Ideal of Chemical Elements: Robert Boyle and the French Didactic Tradition of Chemistry." Science in Context 14, no. 3 (September 2001): 361–95. http://dx.doi.org/10.1017/s0269889701000138.

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ArgumentHistorians have accorded a privileged status to the analytic ideal of elements as a distinctive marker of “modern” chemistry. Boyle’s and Lavoisier’s have been used to characterize their modernity, which has in turn justified their status as the founding fathers of modern chemistry. It has been difficult, however, to establish a viable connection between these two fathers or the genealogy of their definitions. I argue in this paper that French didactic tradition gave rise to the definition Boyle stated in the Sceptical Chymist, or the analytic/philosophical ideal of elements. He did not endorse the definition he gave, but criticized its lack of analytic rigor and philosophical sophistication. His critique served as a negative heuristic, leading to Nicolas Lemery’s analytic ideal of “chemical principles” as distinct from “natural principles.” Lemery’s definition survived in French didactic tradition, as is evidenced in Macquer’s and Guyton’s textbooks which provided direct precedents for Lavoisier’s analytic ideal of “elements or principles.”

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McDowell, Sean A. C. "Using Maple To Obtain Analytic Expressions in Physical Chemistry." Journal of Chemical Education 74, no. 12 (December 1997): 1491. http://dx.doi.org/10.1021/ed074p1491.

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Warfa, Abdi-Rizak M. "Using Cooperative Learning To Teach Chemistry: A Meta-analytic Review." Journal of Chemical Education 93, no. 2 (December 14, 2015): 248–55. http://dx.doi.org/10.1021/acs.jchemed.5b00608.

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Li, Fangfang, Yulong Duan, Jing Li, Xiaomin Xue, Yuxue Guo, Ye Lian, Zhongjie Yang, Xiaofei Zhang, and Jun Guo. "Recent advances of chiral metal-organic frameworks in analytic chemistry." TrAC Trends in Analytical Chemistry 170 (January 2024): 117471. http://dx.doi.org/10.1016/j.trac.2023.117471.

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Steele, Bernard W., Edward Wang, George G. Klee, Linda M. Thienpont, Steven J. Soldin, Lori J. Sokoll, William E. Winter, Susan A. Fuhrman, and Ronald J. Elin. "Analytic Bias of Thyroid Function Tests: Analysis of a College of American Pathologists Fresh Frozen Serum Pool by 3900 Clinical Laboratories." Archives of Pathology & Laboratory Medicine 129, no. 3 (March 1, 2005): 310–17. http://dx.doi.org/10.5858/2005-129-310-abotft.

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Abstract Context.—In proficiency testing surveys, there are differences in the values reported by users of various analytic methods. Two contributors to this variation are calibrator bias and matrix effects of proficiency testing materials. Objectives.—(1) To quantify the biases of the analytic methods used to measure thyroid-stimulating hormone, thyroxine, triiodothyronine, free thyroxine, and free triiodothyronine levels; (2) to determine if these biases are within allowable limits; and (3) to ascertain if proficiency testing materials correctly identify these biases. Design.—A fresh frozen serum specimen was mailed as part of the 2003 College of American Pathologists Ligand and Chemistry surveys. The means and SDs for each analytic method were determined for this sample as well as for a proficiency testing sample from both surveys. In the fresh frozen serum sample, target values for thyroxine and triiodothyronine were determined by isotope dilution/liquid chromatography/tandem mass spectrometry. All other target values in the study were the median of the means obtained for the various analytic methods. Main Outcome Measures.—Calibration biases were calculated by comparing the mean of each analytic method with the appropriate target values. These biases were evaluated against limits based on intra- and interindividual biological variation. Matrix effects of proficiency testing materials were assessed by comparing the rank of highest to lowest analytic method means (Spearman rank test) for each analyte. Participants.—Approximately 3900 clinical laboratories were enrolled in the College of American Pathologists Chemistry and Ligand surveys. Results.—The number of methods in the Ligand Survey that failed to meet the goals for bias was 7 of 17 for thyroid-stimulating hormone and 11 of 13 for free thyroxine. The failure rates were 12 of 16 methods for thyroxine, 8 of 11 for triiodothyronine, and 9 of 11 for free triiodothyronine. The means of the analytic method for the proficiency testing material correlated significantly (P < .05) only with the fresh frozen serum means for thyroxine and thyroid-stimulating hormone in the Chemistry Survey and free triiodothyronine in the Ligand Survey. Conclusions.—A majority of the methods used in thyroid function testing have biases that limit their clinical utility. Traditional proficiency testing materials do not adequately reflect these biases.

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Kim, Sungjune, Seokpyo Hong, Kilsoo Ahn, and Sungyong Gong. "Priority survey between indicators and analytic hierarchy process analysis for green chemistry technology assessment." Environmental Health and Toxicology 30 Suppl (June 12, 2015): s2015003. http://dx.doi.org/10.5620/eht.s2015003.

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Chasman, Daniel I., Guillaume Paré, and Paul M. Ridker. "Population-Based Genomewide Genetic Analysis of Common Clinical Chemistry Analytes." Clinical Chemistry 55, no. 1 (January 1, 2009): 39–51. http://dx.doi.org/10.1373/clinchem.2008.107243.

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Abstract Background: Recent technologies enable genetic association studies of common clinical analytes on a genomewide basis in populations numbering thousands of individuals. The first publications using these technologies are already revealing novel biological functions for both genic and nongenic loci, and are promising to transform knowledge about the biological networks underlying disease pathophysiology. These early studies have also led to development of a set of principles for conducting a successful genomewide association study (GWAS). Content: This review focuses on these principles with emphasis on the use of GWAS for plasma-based analytes to better understand human disease, with examples from cardiovascular biology. Conclusions: The correlation of common genetic variation on a genomewide basis with clinical analytes, or any other outcome of interest, promises to reveal how parts of the genome work together in human physiology. Nonetheless, performing a genomewide association study demands an awareness of very specific epidemiologic and analytic principles.

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Kurbanoğlu, Namudar İzzet, and Ahmet Akın. "DEVELOPMENT OF A SCALE TO MEASURE ORGANIC CHEMISTRY ANXIETY LEVEL OF UNIVERSITY STUDENTS." Journal of Baltic Science Education 14, no. 3 (June 25, 2015): 391–400. http://dx.doi.org/10.33225/jbse/15.14.391.

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University students’ achievements in organic chemistry depend on cognitive variables. In addition, non-cognitive variables such as anxiety levels also have an impact on students’ organic chemistry achievements. The aim of this study was to develop a measurement tool assessing the anxiety levels of university students in organic chemistry lessons. In this study, the Organic Chemistry Anxiety Scale (O-CAS) consisting of 24 items was developed, its validity and reliability was analysed. All the items are positively worded to indicate increased anxiety. Factor analytic evidence from a sample (n=340) of university organic chemistry students indicated that the O-CAS measured three constructs. Additional analysis with a second sample (n=297) showed that scores on these anxiety constructs were internally consistent, with Cronbach’s alphas ranging from 0.87 to 0.92 and were 0.95 for the overall scale. Further, the result of analysis of the third sample (n=195) indicated that there was a statistically significant relationship between organic chemistry anxiety and organic chemistry achievement of students. According to these results, the O-CAS can be used as a valid and reliable instrument in chemistry education. Key words: anxiety, chemistry education, organic chemistry, reliability, and validity.

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Liu, Li-Cai, Bo Tian, Yu-Shan Xue, Ming Wang, and Wen-Jun Liu. "Analytic solution for a nonlinear chemistry system of ordinary differential equations." Nonlinear Dynamics 68, no. 1-2 (September 23, 2011): 17–21. http://dx.doi.org/10.1007/s11071-011-0200-6.

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Feldmann, U., and B. Schneider. "Bivariate Structural Regression Analysis: A Tool for the Comparison of Analytic Methods." Methods of Information in Medicine 26, no. 04 (October 1987): 205–14. http://dx.doi.org/10.1055/s-0038-1635502.

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SummaryThis paper introduces the concept of bivariate structural regression analysis, a new technique which offers some advantages compared to the well-known structural relationship approach. The concept is not restricted to multivariate normal distribution, and without additional constraints the model remains identifiable in the bivariate case. A bivariate calibration line is developed first by the maximum likelihood method and then also distribution-free by applying rank statistics. Both estimation procedures coincide, if the distribution assumption is satisfied. Hence, the distribution-free approach has an efficiency of 100%. Our concept of analysis is applied to the comparison of analytical methods in clinical chemistry. Appropriate statistical tests concerning accuracy and precision as well as the model fit are offered.

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Ищенко and A. Ishchenko. "To the question about the necessity of descriptive geometry and graphics teaching for chemists and chemistry technologists." Geometry & Graphics 1, no. 2 (July 25, 2013): 6–7. http://dx.doi.org/10.12737/776.

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The vital necessity of descriptive geometry and graphic study by students which are training in the specialties of chemist and chemistry technologist is shown. It is concluded that any engineering and scientific creativity in modern chemistry as the science of materials, structural chemistry and chemical dynamics of molecular systems’ interaction process is impossible without the foundations of descriptive geometry, which forms and develops the human spatial thinking. The discovery of conformational transitions in molecules and, in the future, conformational analysis, has predetermined the broad use of descriptive geometry methods in the chemical science. The modern chemistry’s state analysis is leading to conclusion that at present time the descriptive geometry is needed in the educational program of modern chemist and chemistry technologist.

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S., Lazo, and Marcela Arellano. "Evaluación del logro de la competencias básicas en el laboratorio de Química General." Educación Química 10, no. 1 (August 30, 2018): 49. http://dx.doi.org/10.22201/fq.18708404e.1999.1.66506.

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<span>The aim of this work is to evaluate the degree of competence acquired by the students in the laboratory of the General Chemistry course (for students not necessarily majoring in Chemistry) offered by the Institute of Chemistry. Given that this course is a prerequisite for Organic Chemistry and Analytic Chemistry, we consider that it is important to verify that the students, upon fmishing the course, have gained the basic skills expected of them. These abilities include the handling and use of materials, instruments, and chemicals as well as the knowledge of basic concepts in mathematics and chemistry.</span>

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Widarti, Hayuni Retno, Deni Ainur Rokhim, M. Muchson, Endang Budiasih, Sutrisno Sutrisno, Rico Wahyu Pratama, and Moh Ilmanul Hakim. "Developing Integrated Triplet Multi-Representation Virtual Laboratory in Analytic Chemical Materials." International Journal of Interactive Mobile Technologies (iJIM) 15, no. 08 (April 23, 2021): 119. http://dx.doi.org/10.3991/ijim.v15i08.21573.

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<p>Technological developments have triggered the emergence of various kinds of learning media innovations. Learning media is a very important part of the learning process. In this study, researchers designed a learning media in the form of a virtual laboratory on the practicum material of the basics of analytical chemistry which is integrated with multi-representation triplets to create and describe the results of learning media.</p>The method used in this development was Research and Development (R&D) method using the 4-D (four-D) development model. Data collection used qualitative and quantitative data. The qualitative data were in the form of comments and suggestions from the validator, while the quantitative data were the validation questionnaire and legibility test. The results showed that the validation of the material obtained a percentage of 84% (very valid), media validation of 78% (valid), and the results of trials on correspondents obtained a percentage in the range 81-92% (very valid). It can be concluded that the virtual laboratory learning media on the analytical chemistry laboratory material with the integration of the developed multi-representation triplet explanations is feasible to use, especially in the practicum of the basics of analytical chemistry on the topic of group I cation analysis and argentometry. This shows that the virtual laboratory developed has the potential to support online practicum learning, and the macroscopic, submicroscopic, and symbolic depiction in the virtual laboratory can help the process of receiving information by students

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Pfitzner, M., and P. Breda. "An analytic probability density function for partially premixed flames with detailed chemistry." Physics of Fluids 33, no. 3 (March 1, 2021): 035117. http://dx.doi.org/10.1063/5.0038888.

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Izzo, Christopher, Patrick Reis-Santos, and Bronwyn M. Gillanders. "Otolith chemistry does not just reflect environmental conditions: A meta-analytic evaluation." Fish and Fisheries 19, no. 3 (January 5, 2018): 441–54. http://dx.doi.org/10.1111/faf.12264.

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Rosita, Betti, and Ulfa Khairani. "ANALISIS LAMA WAKTU PELAYANAN LABORATORIUM DI RUMAH SAKIT UMUM DAERAH PASAMAN BARAT." JURNAL KESEHATAN PERINTIS (Perintis's Health Journal) 5, no. 1 (June 29, 2018): 114–21. http://dx.doi.org/10.33653/jkp.v5i1.153.

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Hospital laboratory services is one of the activities in hospitals that support quality health services. One indicator of the success of health services in the field of clinical pathology laboratory services is the waiting time for laboratory services. The standard set for laboratory service outcome waiting time is ≤ 140 minutes for blood chemistry and routine blood. This research analyzed the service time of outpatient laboratory that conducted hematology and clinical chemistry examination in the laboratory of Pasaman Barat Hospital. This research is a type of descriptive analytic research that is quantitative and supported by qualitative using cross sectional approach. The result of the research showed that laboratory service time at RSUD Pasaman Barat fulfilled the standard (≤ 140 minutes) for hematology examination 33.94 minutes, clinical chemistry 83.92 minutes, hematology and clinical chemistry 98 minutes. Based on the results of this study, the stages that contribute to the length of time laboratory services for hematological examination lies in the pre analytical stage, for clinical chemistry examination is located at the analytical stage, as well as for hematology and clinical chemistry examination lies in the analytic stage as well as the factors that affect the length of time laboratory services are human resources that is in the ability of officers and infrastructure facilities

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Tautz, N., G. Kaluza, F. Laue, B. Frey, G. Schmitz, M. Jarsch, W. Ankenbauer, et al. "Genetic engineering, DNA analytic." Fresenius' Journal of Analytical Chemistry 337, no. 1 (1990): 110–20. http://dx.doi.org/10.1007/bf00325731.

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Capel, Andrew J., Andrew Wright, Matthew J. Harding, George W. Weaver, Yuqi Li, Russell A. Harris, Steve Edmondson, Ruth D. Goodridge, and Steven D. R. Christie. "3D printed fluidics with embedded analytic functionality for automated reaction optimisation." Beilstein Journal of Organic Chemistry 13 (January 18, 2017): 111–19. http://dx.doi.org/10.3762/bjoc.13.14.

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Additive manufacturing or ‘3D printing’ is being developed as a novel manufacturing process for the production of bespoke micro- and milliscale fluidic devices. When coupled with online monitoring and optimisation software, this offers an advanced, customised method for performing automated chemical synthesis. This paper reports the use of two additive manufacturing processes, stereolithography and selective laser melting, to create multifunctional fluidic devices with embedded reaction monitoring capability. The selectively laser melted parts are the first published examples of multifunctional 3D printed metal fluidic devices. These devices allow high temperature and pressure chemistry to be performed in solvent systems destructive to the majority of devices manufactured via stereolithography, polymer jetting and fused deposition modelling processes previously utilised for this application. These devices were integrated with commercially available flow chemistry, chromatographic and spectroscopic analysis equipment, allowing automated online and inline optimisation of the reaction medium. This set-up allowed the optimisation of two reactions, a ketone functional group interconversion and a fused polycyclic heterocycle formation, via spectroscopic and chromatographic analysis.

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Juanita M. Costillas. "Extent of Transfer of Problem Solving Skills to Other Domains Facilitated Through Anchored Instruction." Journal of Educational and Human Resource Development (JEHRD) 3 (December 10, 2015): 1–23. http://dx.doi.org/10.61569/sm1pgx90.

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This study took deeper look on how much the students applied problem solving skills learned from previous mathematics subject delivered through Anchored Instruction (AI) to other domains using pre-test - post-test Nonequivalent Control Group Design with English proficiency as moderator variable. The contents considered in AI were problems in Arithmetic, Advanced Algebra and Trigonometry. Results revealed that AI affected significantly better extent of transfer of the problem solving skills to General Chemistry but opposite results were found in Solid Mensuration while no significant difference in Analytic Geometry. English proficiency significantly moderated extent of transfer of problem solving skills to other domains like Solid Mensuration and General Chemistry. No interaction effect was found between English proficiency and teaching model. It is recommended that AI be considered as facilitator of transfer of problem solving skills in General Chemistry and enhancements can verify results in Solid Mensuration and Analytic Geometry.

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Roon, Hannah. "Analytic difficulties — solvents." Pigment & Resin Technology 16, no. 5 (May 1987): 14–15. http://dx.doi.org/10.1108/eb042358.

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Suh, Han Na, Young Kyu Kim, Ju Young Lee, Goo-Hwa Kang, and Jeong Ho Hwang. "Dissect the immunity using cytokine profiling and NF-kB target gene analysis in systemic inflammatory minipig model." PLOS ONE 16, no. 6 (June 4, 2021): e0252947. http://dx.doi.org/10.1371/journal.pone.0252947.

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Minipigs have remarkably similar physiology to humans, therefore, they it can be a good animal model for inflammation study. Thus, the conventional (serum chemistry, histopathology) and novel analytic tools [immune cell identification in tissue, cytokine level in peripheral blood mononuclear cells (PBMC) and serum, NF-kB target gene analysis in tissue] were applied to determine inflammation in Chicago Miniature Swine (CMS) minipig. Lipopolysaccharide (LPS)-induced acute systemic inflammation caused liver and kidney damage in serum chemistry and histopathology. Immunohistochemistry (IHC) also showed an increase of immune cell distribution in spleen and lung during inflammation. Moreover, NF-kB-target gene expression was upregulated in lung and kidney in acute inflammation and in heart, liver, and intestine in chronic inflammation. Cytokine mRNA was elevated in PBMC under acute inflammation along with elevated absolute cytokine levels in serum. Overall, LPS-mediated systemic inflammation affects the various organs, and can be detected by IHC of immune cells, gene analysis in PBMC, and measuring the absolute cytokine in serum along with conventional inflammation analytic tools.

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Yüksel, Mehmet. "Determination of Teaching Methods in Chemistry Education by the Analytic Hierarchy Process (AHP)." Necatibey Eğitim Fakültesi Elektronik Fen ve Matematik Eğitimi Dergisi 7, no. 1 (June 30, 2013): 302–32. http://dx.doi.org/10.12973/nefmed163.

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Anamuah-Mensah, Jophus, Gaalen Erickson, and Jim Gaskell. "Development and validation of a path analytic model of students' performance in chemistry." Journal of Research in Science Teaching 24, no. 8 (November 1987): 723–38. http://dx.doi.org/10.1002/tea.3660240806.

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Sendur, G., M. Polat, and C. Kazancı. "Does a course on the history and philosophy of chemistry have any effect on prospective chemistry teachers’ perceptions? The case of chemistry and the chemist." Chemistry Education Research and Practice 18, no. 4 (2017): 601–29. http://dx.doi.org/10.1039/c7rp00054e.

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The creative comparisons prospective chemistry teachers make about “chemistry” and the “chemist” may reflect how they perceive these concepts. In this sense, it seems important to determine which creative comparisons prospective teachers make with respect to these and how these can change after the history of chemistry is treated in the classroom. This study seeks to investigate the impact of the basic History and Philosophy of Chemistry course on prospective chemistry teachers’ perceptions towards chemistry and the chemist. The study was conducted during the 2012–2013 academic year at a state university in Turkey with 38 prospective chemistry teachers. A creative comparisons questionnaire and semi-structured interviews were used as data collection instruments in the study. This questionnaire was administered to the prospective teachers in the form of a pre-test, post-test, and retention test. Results of the analysis showed that the prospective teachers produced creative comparisons related to chemistry in the pre-test that mostly relied on their own experiences and observations, but that in the post-test and retention test, their comparisons mostly contained references to the role of chemistry in daily life, its development, and its facilitating aspects. Similarly, it was observed that in the pre-test, the prospective teachers made creative comparisons regarding the chemist that related mostly to the laboratory, but that the post-test and retention test rather contained the aspects of chemists as researchers, meticulous persons, facilitators and managers. Also, 18 prospective teachers were engaged in interviews to understand their prior knowledge about chemistry and the chemist, as well as the reasons for the changes in their creative comparisons. The results of the interviews indicated that a large majority of the prospective teachers were able to fully reflect on their inadequacy about their previous knowledge about “chemistry” and “chemist,” and it was seen that they could explain the reason they changed their creative comparisons as an outcome of the History and Philosophy of Chemistry course. In the light of these results, it can be said that the History and Philosophy of Chemistry course may help prospective chemistry teachers in their perceptions about both chemistry and the chemist and may add depth to their knowledge.

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Gong 龚, Munan 慕南, Ka Wai Ho, James M. Stone, Eve C. Ostriker, Paola Caselli, Tommaso Grassi, Chang-Goo Kim, Jeong-Gyu Kim, and Goni Halevi. "Implementation of Chemistry in the Athena++ Code." Astrophysical Journal Supplement Series 268, no. 2 (September 19, 2023): 42. http://dx.doi.org/10.3847/1538-4365/aceaf9.

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Abstract Chemistry plays a key role in many aspects of astrophysical fluids. Atoms and molecules are agents for heating and cooling, determine the ionization fraction, serve as observational tracers, and build the molecular foundation of life. We present the implementation of a chemistry module in the publicly available magnetohydrodynamic code Athena++. We implement several chemical networks and heating and cooling processes suitable for simulating the interstellar medium (ISM). A general chemical network framework in the KIDA format is also included, allowing users to easily implement their own chemistry. Radiation transfer and cosmic-ray ionization are coupled with chemistry and solved with the simple six-ray approximation. The chemical and thermal processes are evolved as a system of coupled ordinary differential equations with an implicit solver from the CVODE library. We perform and present a series of tests to ensure the numerical accuracy and convergence of the code. Many tests combine chemistry with gas dynamics, including comparisons with analytic solutions, 1D problems of the photodissociation regions and shocks, and realistic 3D simulations of the turbulent ISM. We release the code with the new public version of Athena++, aiming to provide a robust and flexible code for the astrochemical simulation community.

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Vitek, Carolyn R., Jane C. Dale, Henry A. Homburger, Sandra C. Bryant, Amy K. Saenger, and Brad S. Karon. "Development and Initial Validation of a Project-Based Rubric to Assess the Systems-Based Practice Competency of Residents in the Clinical Chemistry Rotation of a Pathology Residency." Archives of Pathology & Laboratory Medicine 138, no. 6 (June 1, 2014): 809–13. http://dx.doi.org/10.5858/arpa.2013-0046-oa.

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Context.— Systems-based practice (SBP) is 1 of 6 core competencies required in all resident training programs accredited by the Accreditation Council for Graduate Medical Education. Reliable methods of assessing resident competency in SBP have not been described in the medical literature. Objective.— To develop and validate an analytic grading rubric to assess pathology residents' analyses of SBP problems in clinical chemistry. Design.— Residents were assigned an SBP project based upon unmet clinical needs in the clinical chemistry laboratories. Using an iterative method, we created an analytic grading rubric based on critical thinking principles. Four faculty raters used the SBP project evaluation rubric to independently grade 11 residents' projects during their clinical chemistry rotations. Interrater reliability and Cronbach α were calculated to determine the reliability and validity of the rubric. Project mean scores and range were also assessed to determine whether the rubric differentiated resident critical thinking skills related to the SBP projects. Results.— Overall project scores ranged from 6.56 to 16.50 out of a possible 20 points. Cronbach α ranged from 0.91 to 0.96, indicating that the 4 rubric categories were internally consistent without significant overlap. Intraclass correlation coefficients ranged from 0.63 to 0.81, indicating moderate to strong interrater reliability. Conclusions.— We report development and statistical analysis of a novel SBP project evaluation rubric. The results indicate the rubric can be used to reliably assess pathology residents' critical thinking skills in SBP.

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Maenhaut, W., and J. Vandenhaute. "Accurate Analytic Fitting of Pixe Spectra." Bulletin des Sociétés Chimiques Belges 95, no. 5-6 (September 1, 2010): 407–18. http://dx.doi.org/10.1002/bscb.19860950514.

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Jayatilaka, Dylan, Paul E. Maslen, Roger D. Amos, and Nicholas C. Handy. "Higher analytic derivatives." Molecular Physics 75, no. 2 (February 10, 1992): 271–91. http://dx.doi.org/10.1080/00268979200100221.

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Sowmya, P. T., K. M. Lokanatha Rai, Anitha Sudhir, and Sumana Y. Kotian. "Chloramine-T in Organic Synthesis and Analysis of Organic Functional Groups: A Review." Australian Journal of Chemistry 74, no. 10 (2021): 689. http://dx.doi.org/10.1071/ch21089.

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The diverse nature of Chloramine-T, the sodium salt of N-chloro-p-toluenesulfonamide, abbreviated as CAT, acts as a source of halonium cation and nitrogen anion, and acts as both base and nucleophile. It reacts with broad range of functional groups and brings divergent molecular transformations to synthetic chemistry. CAT has also gained much recognition as a mild oxidant for several organic moieties and has been used as a versatile reagent for the estimation of various functional groups in analytical chemistry. This review relays the synthetic and analytic utility of CAT from different literature sources. As aspects of the synthetic utility of CAT have not previously been reviewed, this article gives a comprehensive profile of the CAT reagent for further research development.

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Garland, W. A., and M. P. Barbalas. "Applications to Analytic Chemistry: An Evaluation of Stable Isotopes in Mass Spectral Drug Assays." Journal of Clinical Pharmacology 26, no. 6 (July 8, 1986): 412–18. http://dx.doi.org/10.1002/j.1552-4604.1986.tb03550.x.

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Kryachko, Eugene S. "Modeling molecular interactions by analytic potentials: Analytic perturbation treatment." International Journal of Quantum Chemistry 112, no. 18 (May 7, 2012): 2986–97. http://dx.doi.org/10.1002/qua.24136.

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Klee, George G. "Establishment of Outcome-Related Analytic Performance Goals." Clinical Chemistry 56, no. 5 (May 1, 2010): 714–22. http://dx.doi.org/10.1373/clinchem.2009.133660.

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Abstract Background: Accrediting organizations require laboratories to establish analytic performance criteria that ensure their tests provide results of the high quality required for patient care. However, the procedures for instituting performance criteria that are directly linked to the needs of medical practice are not well established, and therefore alternative strategies often are used to create and implement surrogate performance standards. Content: We reviewed 6 approaches for establishing outcome-related analytic performance goals: (a) limits defined by regulations and external assessment programs, (b) limits based on biologic variation, (c) limits based on surveys of clinicians about their needs, (d) limits based on effects on guideline driven medical decisions, (e) limits based on analysis of patterns for ordering follow-up clinical tests, and (f) limits based on formal medical decision models. Performance criteria were tabulated for 12 common chemistry analytes and 4 routine hematology tests. Conclusions: There is no consensus currently about the preferred methods for establishing medically necessary analytic performance limits. The various methods reviewed give considerably different performance limits. The analytic performance limits claimed by a laboratory should correspond to those limits that can be reliably maintained based on validated QC monitoring systems. These limits generally are larger than the observed CVs and bias parameters collected for assay validation. There is a major need for increased communication among laboratorians and clinicians on this topic, especially when the analytic performance limits that can be consistently maintained by a laboratory are inconsistent with the expectations of health care providers.

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Souers, P. Clark, and Peter Vitello. "Analytic Model of Reactive Flow." Propellants, Explosives, Pyrotechnics 30, no. 5 (October 2005): 381–85. http://dx.doi.org/10.1002/prep.200500029.

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Pallotti, Gabriele. "Holistic and analytic assessment of functional adequacy." TASK / Journal on Task-Based Language Teaching and Learning 2, no. 1 (June 20, 2022): 85–114. http://dx.doi.org/10.1075/task.21014.pal.

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Abstract This study looks at the correlation between functional adequacy (FA), holistically assessed, and analytic linguistic measures, in a corpus of texts written by Italian monolingual and multilingual primary school pupils. Texts were first evaluated using the FA rating scales by Kuiken and Vedder (2017, 2018), plus one for Coherence & Cohesion from the CEFR (Council of Europe, 2001′). They were then coded for a number of features directly bearing on FA and its subdimensions. Results show correlations between holistic scores and analytic measures, such as those between Content and the number of words or secondary idea units (r = .59 / .65). Others were less strong, yet going in the expected direction, e.g. more ambiguous referential expressions were negatively correlated to Comprehensibility. Correlations were generally stronger for monolingual than for multilingual children.

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Reckhow, Kenneth H. "A decision analytic framework for environmental analysis and simulation modeling." Environmental Toxicology and Chemistry 13, no. 12 (December 1994): 1901–6. http://dx.doi.org/10.1002/etc.5620131205.

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Gaye, Amadou, Tim Peakman, Martin D. Tobin, and Paul R. Burton. "Understanding the impact of pre-analytic variation in haematological and clinical chemistry analytes on the power of association studies." International Journal of Epidemiology 43, no. 5 (July 31, 2014): 1633–44. http://dx.doi.org/10.1093/ije/dyu127.

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Park, Han Jong, Ju Hwan Han, and Hyoung Won Seo. "A Study on the Improvement of Analytic Method for Wire Molten Mark through Analytical Chemistry." Magazine of Fire Investigation Socity of Korea 11, no. 2 (June 30, 2020): 47–63. http://dx.doi.org/10.31345/fisk.2020.11.2.4.

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Sugano, Shalom Grace C., Edna B. Nabua, Manuel B. Barquilla, Amelia T. Buan, and Ellen N. Inutan. "Meta-analytic review of studies on the effectiveness of chemistry teaching methods on student transformation." Journal of Physics: Conference Series 1340 (October 2019): 012082. http://dx.doi.org/10.1088/1742-6596/1340/1/012082.

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Yanai, Takeshi, George I. Fann, Zhengting Gan, Robert J. Harrison, and Gregory Beylkin. "Multiresolution quantum chemistry in multiwavelet bases: Analytic derivatives for Hartree–Fock and density functional theory." Journal of Chemical Physics 121, no. 7 (August 15, 2004): 2866–76. http://dx.doi.org/10.1063/1.1768161.

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Pfitzner, Michael, and Markus Klein. "A near-exact analytic solution of progress variable and pdf for single-step Arrhenius chemistry." Combustion and Flame 226 (April 2021): 380–95. http://dx.doi.org/10.1016/j.combustflame.2020.12.007.

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Mihucz, Victor. "Analytical Chemistry is like the Fruit of an Apple Tree." Brazilian Journal of Analytical Chemistry 10, no. 42 (January 3, 2024): 1–2. http://dx.doi.org/10.30744/brjac.2179-3425.editorial.vgmihucz.n42.

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Analytical chemistry is deeply rooted in Europe. It started with the work of Liebig and Fresenius, among others. Then Kirchhoff, as father of spectroscopy, contributed to the development of the modern instrumental analysis techniques flourishing today. As soon as I started learning analytical chemistry at university, I fell in love with it. At that time, I could not explain why I wanted to become an analytical chemist. Having gained experience teaching and performing research in analytical chemistry, I know now that I am attracted to it because this branch of chemistry is what an apple means to an apple tree - the fruit of a myriad of results in fundamental research in chemistry, always offering solutions to real life problems. I always wanted to become an analyst and to work at the analytical chemistry department where I studied. One year ago, my life drastically changed at the institute when I was invited to apply to lead the analytical chemistry department where I have been working since 2007. I must admit that I had mixed feelings in the beginning. First of all, I was honored that my colleagues in the department fully expressed their support. At the same time, I was confused and scared. I felt that I am not the right person to lead a department with a history of almost 120 years, that I had no clear vision of what could I do for my colleagues and for the students choosing our department. However, I wanted to express my gratitude to my colleagues for their trust in me. In my application, I advocated to maintain the high-quality teaching of analytical chemistry at the department and offered to implement challenge-based learning for students choosing our department. In past years, I felt that the raison d'être of analytical chemistry departments as single entities would soon end. My colleagues working in other fields such as biology, geography and geology, pharmacy and medicine, all purchased instrumental analytical equipment and started performing research by themselves. Recently, analytical chemistry departments underwent important organizational and structural changes. Some of them disappeared, others incorporated into their name environmental chemistry, food chemistry, or biochemistry. Recent advances in instrumental analysis create the impression that conducting chemical analysis is an easy task that no longer requires the expertise of chemists devoted to this branch of chemistry. However, there is still a lot of work to do, especially in the field of organic analytical chemistry. Thanks to innovations in mass spectrometry and related techniques, infrared spectroscopy, miniaturization (lab-on-chips) and sensors, ultra trace analysis, green methodologies, and elemental speciation, analytical chemistry is experiencing a second Golden Era. In last year alone, I was surprised by the ever-increasing number of chemistry bachelor and major students knocking on my door asking me to provide them with analytical chemistry-related research topics. That led me to contact faculty working at the other institutes offering cooperation with the arsenal of our instruments to widen the research topic choices in our department, advocating that we should unite and complement our efforts to create synergies. Surprisingly, the response of those colleagues was very positive. In one year, I could almost double the number of research topics for diploma work in our department. This is something that makes me happy and optimistic. I am confident that the development of analytical methods together with proper sampling and sample preparation are still important and crucial steps to produce high quality and reliable results. Moreover, participation of analytical chemists in these tasks is indispensable. The recent success of the Brazilian Journal of Analytical Chemistry achieving an impact factor of 0.7 makes me also think that analytical method development has still a bright future ahead. Long live Analytical Chemistry! Long live Brazilian Journal of Analytical Chemistry!

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Koenders, M. M. J. F., M. E. J. F. van Hurne, M. Glasmacher-Van Zijl, G. van der Linde, and B. W. J. J. M. Westerhuis. "The analytic impact of a reduced centrifugation step on chemistry and immunochemistry assays: an evaluation of the Modular Pre-Analytics." Annals of Clinical Biochemistry 49, no. 5 (August 2, 2012): 468–74. http://dx.doi.org/10.1258/acb.2012.011233.

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Paatero, Pentti, and Philip K. Hopke. "Rotational tools for factor analytic models." Journal of Chemometrics 23, no. 2 (February 2009): 91–100. http://dx.doi.org/10.1002/cem.1197.

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Journal articles on the topic 'Chemistry, Analytic'

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