Showing 581 - 600 results of 8,228 for search 'Linear sampling', query time: 0.11s Refine Results
  1. 581

    Evaluation of miR-146a Expression Levels in Archived Serum Samples for the Diagnosis/Follow-up of Patients with Cystic Echinococcosis by Eylem Akdur Öztürk, Mesude Angın, Çağıl Coşkun, Ayşegül Ünver

    Published 2025-03-01
    “…Results: The miR146 gene was found to be significantly upregulated in archived serum samples of patients with CE compared to healthy control samples. …”
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    Article
  2. 582
  3. 583

    Nitrogen-rich covalent organic polymers for efficient solid phase extraction of nonsteroidal anti-inflammatory drugs from water samples by Yuqi Cheng, Jia Li, Xiaochen Xiu, Xinghua Teng, Wen Zhang, Lei Ji, Leilei Wang

    Published 2025-02-01
    “…Then, utilizing nitrogen-rich covalent organic polymer as adsorbent for solid phase extraction cartridges, the pretreatment method was combined with high-performance liquid chromatography-diode array detection to quantify five representative NSAIDs (ketoprofen, carprofen, flurbiprofen, diclofenac and mefenamic acid) in environmental water samples. Under the optimal extraction conditions (adsorbent amount: 40 mg; NaCl concentration: 0%; pH 6; extraction time: 20min; eluent solvent: 4 mL of formic acid/acetonitrile (5%, v/v)), the proposed method provided low detection limits (0.06–0.2 μg L-1), wide linear ranges (0.2–100 μg L-1) with correlation coefficients (0.9991–0.9997) and acceptable precision (RSDs, 6.6–8.5% for intra-day, 7.2–9.5% for inter-day). …”
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  4. 584

    Assessing psychometric of the perceived stress scale and identifying stress-associated factors in a sample of Ukrainian female refugees in the Czech Republic by Iryna Mazhak, Kateryna Maltseva, Danylo Sudyn

    Published 2024-01-01
    “…The purposes of the study were: 1) to examine the psychometric qualities of the Ukrainian versions of the PSS-14 and PSS-10; 2) to determine the level of perceived stress; 3) to reveal factors associated with perceived stress in the sample of Ukrainian female refugees in the Czech Republic (N = 919). …”
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    Article
  5. 585

    Spatiotemporal variability of urinary pesticide biomarker levels in 201 South African children sampled five times over two years by Regina Ntsubise Molomo, Adriana Fernandes Veludo, Paola Viglietti, Hannah Wey, Anouk Petitpierre, Christian Lindh, Martin Röösli, Mohamed Aqiel Dalvie, Samuel Fuhrimann

    Published 2025-08-01
    “…Intraclass correlation coefficients (ICCs) evaluated temporal agreements between repeated urine samples. Linear mixed-effects models assessed the effects of farm residency, study area and pesticide spraying period on urinary pesticides levels. …”
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    Article
  6. 586
  7. 587

    Detection of Polycyclic Aromatic Hydrocarbons in Water Samples by Annular Platform-Supported Ionic Liquid-Based Headspace Liquid-Phase Microextraction by Xiaojie Sun, Jie Tan, Haiyan Ding, Xiaojie Tan, Jun Xing, Lihong Xing, Yuxiu Zhai, Zhaoxin Li

    Published 2018-01-01
    “…The results indicated that this method showed good linearity (R2 > 0.995) within 0.5 µg·L−1 to 1000 µg·L−1 for PAHs. …”
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  8. 588

    Dispersive liquid-liquid microextraction/HPLC techniques for determination of oxytetracycline and doxycycline residues in beef samples: method developments and statistical analysis by Muinat Aliu, Abibat Junaid, Abdulrahman Ibraheem, Aisha Ishaq, Abubakar Lawal, Kikelomo Ayeni`, Amudalat Lawal, Lukman Abdulra'uf

    Published 2023-04-01
    “… A rapid, cost-effective and environment-friendly sample pre-treatment method involving dispersive liquid-liquid microextraction (DLLME) and high-performance liquid chromatography (HPLC) was developed and applied for the extraction of oxytetracycline and doxycycline residues in beef samples (liver, kidney and muscle). …”
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    Article
  9. 589

    Study of Strength and Deformation Evolution in Raw and Briquette Coal Samples under Uniaxial Compression via Monitoring Their Acoustic Emission Characteristics by Han Meng, Yuzhong Yang, Liyun Wu, Fei Wang, Lei Peng

    Published 2020-01-01
    “…The uniaxial compressive strength and elastic modulus of briquette coal samples show a linearly increasing relationship with cement content, while their Poisson’s ratio decreases gradually. …”
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  10. 590
  11. 591

    Determination of Pyrethroids in Paris polyphylla Sample by High-Performance Liquid Chromatography Using Ultrasound-Assisted Magnetic Solid-Phase Extraction by Wei Zhang, Xin Zhao, Hengling Meng, Jin Yang, Xiang Wei, Yong Min

    Published 2019-01-01
    “…Under the optimized experimental conditions, a good linearity was observed in the range of 1-100.0 ng mL−1 for all the analytes, with the correlation coefficients (r) ranging from 0.9962 to 0.9991. …”
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  12. 592

    A mixed-mode LC-MS-based method for comprehensive analysis of NAD and related metabolites from biological sample matrices by Omprakash Nacham, Jordan W. Brown, Mohammad Mehdi Maneshi, Victoria Kurschner, Mike Sheehan, Renee Sadowski, Chris Ling, Nari Talaty, Robert Johnson, Andrew M. Swensen

    Published 2025-04-01
    “…Fit-for purpose method qualification was performed with regard to linearity, accuracy, and precision. The method described was developed to be compatible with NAD-Glo assay (bioluminescence-based plate reader assay) conditions for purposes of further validating NAD-Glo and allow for expanded NAD+ pathway profiling in NAD-Glo samples. …”
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  13. 593

    Students’ mathematics achievement in Mindanao context: A meta-analysis by Roar Abalos Callaman, Estela Corro Itaas

    Published 2020-06-01
    “…To determine the significant factors be included in the model that significantly influence students’ achievement, Hierarchical Linear Modeling (HLM) was utilized. The findings revealed that the overall effect sizes have a small effect on mathematics achievement. …”
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    Article
  14. 594

    Models, systems, networks in economics, engineering, nature and society by S.I. Noskov, E.S. Popov

    Published 2024-11-01
    “…To achieve this goal, the mathematical apparatus for solving linear and linear Boolean programming problems was used. …”
    Article
  15. 595

    Standardised Resting Time Prior to Blood Sampling and Diurnal Variation Associated with Risk of Patient Misclassification: Results from Selected Biochemical Components. by Ida B Andersen, Claus L Brasen, Henry Christensen, Lene Noehr-Jensen, Dorthe E Nielsen, Ivan Brandslund, Jonna S Madsen

    Published 2015-01-01
    “…Each patient's arrival time and time of blood sampling were registered. The impact of resting time and the time of day for all components was analysed using simple linear regression. …”
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  16. 596
  17. 597

    Time–frequency mode structure study of ultrafast two-photon quantum state with two-color dual-comb-based optical sampling by Prasad Koviri, Takahisa Kuwana, Hajime Komori, Masahiro Ishizeki, Takashi Kato, Akifumi Asahara, Thomas R. Schibli, Ryosuke Shimizu, Kaoru Minoshima

    Published 2025-05-01
    “…We develop a new method to probe the time–frequency mode structure of ultrafast two-photon states utilizing dual-comb-based asynchronously overlapping pulses with single-photon frequency upconversion through femtosecond optical sampling. This method enables quick, highly precise joint temporal intensity measurements over a broad temporal dynamic range with only a single linear scanning stage. …”
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  18. 598
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  20. 600

    Measurement of bit-rock interface temperature and wear rate of the tungsten carbide drill bit during rotary drilling by Vijay Kumar Shankar, Bijay Mihir Kunar, Chivukula Suryanarayana Murthy, M. R. Ramesh

    Published 2020-04-01
    “…In addition, this paper develops the relationship between temperature and wear rate characteristics by employing simple linear regression analysis.…”
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