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Aims and objectives: To develop and psychometrically test a food frequency questionnaire for adults at risk of coronary heart disease (Cardio‐FFQ). Background: Comprehensive dietary assessment is critical for the prevention of cardiovascular disease, but appropriate instruments to perform this work are lacking. Design: A sequential mixed‐methods study followed the COREQ and STROBE guidelines. Methods: This study was conducted between April 2016 and November 2017. It started with dietary history interviews (Phase 1) to identify candidate food items of the Cardio‐FFQ, which validity and reliability were assessed (Phase 2) through expert consultation and four seasonal measurements, including test and retest with a 2‐week gap every season. Physical activity and blood glucose and lipids were assessed seasonally, while another FFQ was administered during the fourth measurement. Content analysis was used to analyse verbatim interview transcripts, while descriptive and inferential analyses were used to simplify the Cardio‐FFQ and examine its psychometric properties. Results: Phase I involved 34 participants during their first onset of acute coronary syndrome and generated 176 candidate food items (consumed by at least three participants) under 12 food categories. These food items were simplified to form the 133‐item Cardio‐FFQ after discarding items with trivial contributions to food commonalities or between‐person variance. Further analysis showed that the simplified questionnaire had satisfactory content validity, concurrent validity, convergent validity, predictive validity, known‐group validity and test–retest reliability. Conclusion: The 133‐item Cardio‐FFQ is a valid and reliable tool for a comprehensive dietary assessment appropriate for adults at risk of coronary heart disease. Relevance to clinical practice: Nurses may use the Cardio‐FFQ to conduct a dietary assessment to better support people to commit to healthy diets, aiming to reduce the risk of coronary heart disease. [ABSTRACT FROM AUTHOR]

Beta-site amyloid precursor protein cleaving enzyme 1 (BACE1) is an aspartic protease that promotes the production of beta-amyloid (Aβ) peptides from beta-site amyloid precursor protein. Pharmacological reduction of Aβ production by inhibiting BACE1 has emerged as a promising target for the treatment of Alzheimer's disease (AD). In this work, we reported a simple electrochemical method for detection of BACE1 and screening of its inhibitor. This method made use of an unlabeled peptide that comprises a segment of beta-site amyloid precursor protein with the Swiss mutation. The peptide–heme complex formed on the electrode surface showed strong electrocatalytic O 2 reduction. Cleavage of the peptide by BACE1 detached the heme-binding fragment from the electrode surface, leading to a remarkable decrease in the electrochemical signal. Suppression of BACE1 by the inhibitor yielded a larger voltammetric signal. The IC 50 of the inhibitor tested by this method (15.7 nM) was in agreement with that reported. The proposed method could serve as a promising alternative to the traditional methods for probing of BACE1 activity and screening of BACE1 inhibitor owing to its simplicity, high sensitivity and low assay cost. [ABSTRACT FROM AUTHOR]

Uniformly sized and shape-controlled nanoparticles are important due to their applications in catalysis, electrochemistry, ion exchange, molecular adsorption, and electronics. Several ferric phosphate hydroxide (Fe4(OH)3(PO4)3) microstructures were successfully prepared under hydrothermal conditions. Using controlled variations in the reaction conditions, such as reaction time, temperature, and amount of hexadecyltrimethylammonium bromide (CTAB), the crystals can be grown as almost perfect hyperbranched microcrystals at 180 °C (without CTAB) or relatively monodisperse particles at 220 °C (with CTAB). The large hyperbranched structure of Fe4(OH)3(PO4)3 with a size of ∼19 μm forms with the 'fractal growth rule' and shows many branches. More importantly, the magnetic properties of these materials are directly correlated to their size and micro/nanostructure morphology. Interestingly, the blocking temperature ( TB) shows a dependence on size and shape, and a smaller size resulted in a lower TB. These crystals are good examples that prove that physical and chemical properties of nano/microstructured materials are related to their structures, and the precise control of the morphology of such functional materials could allow for the control of their performance. [ABSTRACT FROM AUTHOR]

This work describes the first demonstration of nanocrystal plane dependent nonenzymatic electro-catalytic glucose activity of [Cu3(btc)2] nanocrystals with different shapes (nanocube, truncated cube, cuboctahedron, and octahedron). From electrochemical results, the obtained [Cu3(btc)2] nanocube modified electrode shows the best nonenzymatic electro-catalytic glucose activity. Interestingly, decreasing the {100} crystal planes from cubes to octahedra, changes the nonenzymatic electro-catalytic activity from highly sensitive to general.

Co3V2O8 thin nanoplates are firstly described as a kind of electrode material for supercapacitors. More importantly, from electrochemical measurements, the obtained Co3V2O8 nanoplate electrode shows a good specific capacitance (0.5 A g(-1), 739 F g(-1)) and cycling stability (704 F g(-1) retained after 2000 cycles). This study essentially offers a new kind of metal vanadium oxides as electrochemical active material for the development of supercapacitors.