Effect of end group of amorphous perfluoro-polymer electrets on electron trapping

Charge trap in amorphous perfluoro-polymer electret is studied, focusing on electron trap site and trap energy. Low-energy inverse photoelectron spectroscopy is adopted to measure solid-state electron affinity (EA) of cyclic transparent optical polymer (CYTOP). EA of CYTOP CTL-S is discovered by compensating the unwanted charge-up effect. Negatively-charged electret materials (polyethylene, ethylene-tetra-fluoro-ethylene, poly-tetra-fluoro-ethylene, and CYTOP) are analyzed by quantum mechanical calculation. Density functional theory with long-range correction is adopted to analyze orbital energies of single molecular systems. Intramolecular distribution of trapped electron and EA are investigated. Calculated electron affinities of CYTOP polymers with different end group are qualitatively in accordance with trapped charge stability measured with thermal stimulated discharge, signifying that electron affinities obtained with the present simulation can be used as an index of amorphous polymer electret.     

Comparative analysis of phytochemicals and polar metabolites from colored sweet potato (Ipomoea batatas L.) tubers

Food Science and Biotechnology - We determined the phytochemical diversity, including carotenoids, flavonoids, anthocyanins, and phenolic acids, in sweet potatoes (Ipomoea batatas L.) with...     

Compositional analyses of diverse phytochemicals and polar metabolites from different-colored potato (Solanum tubersum L.) tubers

Food Science and Biotechnology - Lipophilic bioactive compounds and hydrophilic primary metabolites from potato (solanum tubersum L.) tubers with different-colored flesh (white-, yellow-, red-, and...     

Stretchable Active Matrix Inorganic Light‐Emitting Diode Display Enabled by Overlay‐Aligned Roll‐Transfer Printing

An active matrix‐type stretchable display is realized by overlay‐aligned transfer of inorganic light‐emitting diode (LED) and single‐crystal Si thin film transistor (TFT) with roll processes. The roll‐based transfer enables integration of heterogeneous thin film devices on a rubber substrate while preserving excellent electrical and optical properties of these devices, comparable to their bulk properties. The electron mobility of the integrated Si‐TFT is over 700 cm² V^?1 s^?1, and this is attributed to the good interface between the Si channel and the thermally grown SiO₂ insulator. The light emission properties of the LED are of wafer quality. The resulting display stably operates under tensile strains up to 40%, over 200 cycles, demonstrating the potential of stretchable displays based on inorganic materials.     

Comparative analysis of genetically modified brown rice with conventional rice varieties for the safety assessment

Compositional analysis of genetically modified (GM) rice (OsCK1), non‐GM comparator and reference rice as commercial rice was conducted for the safety assessment. The tolerance intervals (TI) of commercial rice were also set to illustrate compositional variability. GM rice, non‐GM rice and reference rice were compared using principal component analysis (PCA) and partial least squares‐discriminant analysis (PLS‐DA) to assess the impact of genetic modification vs. environmental influence on the rice component. Seventeen components in forty‐six analysed components were significantly different between GM rice and non‐GM rice. But, the mean ranges of the seventeen components were all within those of the reference TIs. These results demonstrate that the nutrition components of GM rice (OsCK1) fell within the range of natural variability and were biologically equivalent to non‐GM rice. In addition, multivariate analysis by PCA and PLS‐DA revealed that environmental factors such as growing locations were important due to the variability of the rice metabolite profiles. These comparisons lead to the conclusion that disease‐resistant transgenic rice (OsCK1) is compositionally equivalent to and as safe and nutritious as conventional rice varieties grown commercially.