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1. A LC–MS/MS method for the simultaneous determination of 6‐cyanodopamine, 6‐nitrodopamine, 6‐nitrodopa, 6‐nitroadrenaline and 6‐bromodopamine in human plasma and its clinical application in patients with chronic kidney disease

   https://doi.org/10.1002/bmc.5896  

   Ribeiro, Luiz_Fernando; Babadopulos, Tainah; de_Oliveira, Mariana_G; Nishimaru, Flávio; Zatz, Roberto; Elias, Rosilene_Motta; Moraes, Odorico; Moraes, Elisabete; Peterson, Larryn_W; De_Nucci, Gilberto (May 2024, Biomedical Chromatography)

   Abstract The aim of this study was to develop a high‐performance liquid chromatography–tandem mass spectrometry method for the determination of 6‐cyanodopamine, 6‐nitrodopamine, 6‐nitrodopa, 6‐nitroadrenaline and 6‐bromodopamine in human plasma samples. Strata‐X 33 μm solid‐phase extraction cartridges were used for the extraction of the catecholamines from human plasma samples. The catecholamines were separated in a 150 × 3 mm Shim‐pack GIST C₁₈‐AQ column with 3 μm particle size, placed in an oven at 40°C and perfused with 82% mobile phase A (acetonitrile–H₂O; 90:10, v/v) + 0.4% acetic acid and 18% mobile phase B (deionized H₂O) + 0.2% formic acid at a flow rate of 340 μl/min in isocratic mode. The injected volume was 4 μl and the run lasted 4 min. The method was linear from 0.1 to 20 ng/ml and the lower limit of quantification was 0.1 ng/ml for all analytes. The method was applied to evaluate the plasma levels of catecholamines in plasma of patients with chronic kidney disease and allowed the detection for the first time of circulating levels of the novel catecholamines 6‐bromodopamine and 6‐cyanodopamine. 

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2. K 6 minors in large 6-connected graphs

   https://doi.org/10.1016/j.jctb.2017.09.007  

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3. An Organometallic Erbium Bismuth Cluster Complex Comprising a Bi ₆ ^6– Zintl Ion

   https://doi.org/10.1021/acs.inorgchem.4c02636  

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4. Listing 6-Cycles

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5. Orthogonal Images Concealed Within a Responsive 6‐Dimensional Hypersurface

   https://doi.org/10.1002/adma.202100803  

   Zholdassov, Yerzhan_S; Valles, Daniel_J; Uddin, Samiha; Korpanty, Joanna; Gianneschi, Nathan_C; Braunschweig, Adam_B (April 2021, Advanced Materials)

   Abstract A photochemical printer, equipped with a digital micromirror device (DMD), leads to the rapid elucidation of the kinetics of the surface‐initiated atom‐transfer radical photopolymerization ofN,N‐dimethylacrylamide (DMA) andN‐isopropylacrylamide (NIPAM) monomers. This effort reveals conditions where polymer brushes of identical heights can be grown from each monomer. With these data, hidden images are created that appear upon heating the substrate above the lower critical solution temperature (LCST) of polyNIPAM. By introducing a third monomer, methacryloxyethyl thiocarbamoyl rhodamine B, a second, orthogonal image appears upon UV‐irradiation. With these studies, it is shown how a new photochemical printer accelerates discovery, creates arbitrary patterns, and addresses long‐standing problems in brush polymer and surface chemistry. With this technology in hand a new method is demonstrated to encrypt data within hypersurfaces. 

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