3 research outputs found

    Blood Collection Tubes and Storage Temperature Should Be Evaluated when Using the Siemens ADVIA Centaur XP for Measuring 25-Hydroxyvitamin D

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    <div><p>A significant bias was found when using the Siemens ADVIA Centaur XP system for measurement of 25-hydroxyvitamin D (25OHD) with VACUETTE<sup>®</sup> tubes with Serum Clot Activator and Gel. Here, we examined whether other commonly used tubes or temperatures affected 25OHD results obtained with the Siemens ADVIA Centaur XP system. Serum was collected into five types of vacuum blood collection tubes from three manufacturers, and 25OHD was analyzed using the Siemens ADVIA Centaur XP system and liquid chromatography tandem mass spectrometry (LC-MS/MS) immediately or after storage at 4°C or -80°C for 48 h. Significantly higher 25OHD values were found when using the Siemens ADVIA Centaur XP system with VACUETTE<sup>®</sup> tubes with serum clot activator and gel and VACUETTE<sup>®</sup> tubes with clot activator but no gel compared with VACUETTE<sup>®</sup> tubes with no additives. The 25OHD values in all of these tubes were not significantly different from those obtained by LC-MS/MS. Moreover, after storage at -80°C for 48 h, the values obtained in IMPROVEVACUTER<sup>®</sup> tubes with serum clot activator and gel significantly increased, with a mean bias of 74.6% compared with the values before storage, on analysis with the Siemens ADVIA Centaur XP system. VACUETTE<sup>®</sup> tubes containing additives significantly affect the accuracy of 25OHD results obtained using the Siemens ADVIA Centaur XP system. Additionally, the composition of serum collected in IMPROVEVACUTER<sup>®</sup> tubes was affected by freezing, resulting in different measurements when using the Siemens 25OHD assay platform.</p></div

    Comparison of 25OHD results obtained using the Siemens ADVIA Centaur XP system for all types of tubes and those obtained using LC-MS/MS analysis (averaged results).

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    <p>I–IV are Passing-Bablok regression analyses for the Siemens system (5-mL BD Vacutainer<sup>®</sup> SST tubes, IMPROVEVACUTER<sup>®</sup> tubes with serum clot activator and gel, VACUETTE<sup>®</sup> 4-mL no-additive tubes, and VACUETTE<sup>®</sup> tubes with serum clot activator and gel, respectively) and 25OHD results from the LC-MS/MS analysis (averaged results). V–VIII are Bland-Altman plots showing the 25OHD bias between the Siemens system using the four types of tubes and LC-MS/MS (averaged results).</p

    Laser-Induced Flash-Evaporation Printing CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Thin Films for High-Performance Planar Solar Cells

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    Organic–inorganic hybrid perovskites have been emerging as promising light-harvesting materials for high-efficiency solar cells recently. Compared to solution-based methods, vapor-based deposition technologies are more suitable in preparing compact, uniform, and large-scale perovskite thin films. Here, we utilized flash-evaporation printing (FEP), a laser-induced ultrafast single source evaporation method employing a carbon nanotube evaporator, to fabricate high-quality methylammonium lead iodide perovskite thin films. Stoichiometric films with pure tetragonal perovskite phase can be achieved using a controlled methylammonium iodide to lead iodide ratio in evaporation precursors. The film crystallinity and crystal grain growth could further be promoted after postannealing. Planar solar cells (0.06 cm<sup>2</sup>) employing these perovskite films exhibit a champion power conversion efficiency (PCE) of 16.8% with insignificant hysteresis, which is among the highest reported PCEs using vapor-based deposition methods. Large-area (1 cm<sup>2</sup>) devices based on such perovskite films also achieved a stabilized PCE of 11.2%, indicating the feasibility and scalability of our FEP method in fabricating large-area perovskite films for other optoelectronic applications
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