Greeryang9767

Overall, our results provide fundamental understanding, on an atomistic level, of the electronic and optical properties of ultrathin, quasi 2D (In,Ga)N monolayers embedded in GaN, and offer guidance for the tailoring of their properties for potential future device applications.Synthesis and bonding aspects of mononuclear bis-amidinate indium(iii) monohalides L2InX (1-3), where L = PhC(NtBu)2; X is F (1), Br (2) or I (3) and β-diketiminate (NacNac) stabilized In(ii) dimer (MesNacNac)2In2Br2 (4) with In-In bond are reported along with the single-crystal X-ray structures of 2-4.The overexposure of the skin to ultraviolet (UV) radiation may lead to oxidative stress, resulting in severe damage. The prevention of skin injuries through the topical application of natural compounds rich in antioxidants, such as propolis extracts, has shown promising results. In Brazil, the "red propolis" extract has stood out due to its complex constitution, based mainly on polyprenylated benzophenones (BZP). However, although the use of red propolis extracts has been shown to be encouraging, their addition in topical formulations is limited by the low solubility of BZP. For this reason, this study aimed to develop topical nanoemulgels containing Brazilian red propolis (BRP) extract to increase the potential of topical application, and the evaluation of skin protection against UVA/UVB radiation damage by means of protein carbonylation, protein thiol content and TBARS assays. The nanoemulgels were obtained by adding gelling polymer to nanoemulsions that were previously prepared by spontaneous emulsificatiorenylated BZP. Altogether, the outcomes of this study suggest that nanoemulgels have suitable characteristics for topical application, and may be an alternative for the prevention of oxidative skin damage caused by UVA/UVB radiation.The application of yeast extract (YE) in foods has widely evolved in recent decades. Generally, YE is added to foods because of its characteristic meaty and savory flavor notes. The composition of YE has made it an important ingredient for the production of meat-like flavors. This study focuses on the simulation of beef-like odorants from yeast extract through the Maillard reaction. Additionally, an optimization process was conducted via the central composite design (CCD) to optimize the Maillard reaction conditions. Glutathione-enriched yeast extract (GSH-YE) was utilized as the precursor with the partial addition of cysteine and ribose to form beef-like aroma compounds. The key odorants generated through the Maillard reaction were characterized via HS-SPME-GCMS and the contents of the Maillard precursors were analyzed via HPLC. The optimized conditions produced numerous pyrazines, furans, thiazoles, and sulfur- and nitrogen-containing compounds responsible for mimicking beef-like aromas. 2,5-Dimethyl-furan, 2,5-dimethyl-pyrazine, thiazole, 2-methyl-3-furanthiol, dimethyl trisulfide, 3,5-diethyl-2-methyl-pyrazine, 3,3'-dithiobis[2-methyl-furan] and 2-methyl-3-(methylthio) furan were the predominant odorants generated through the Maillard reaction. Moreover, the individual effect of initial pH and thermal temperature showed dramatic changes in the overall volatile profile. The content of cysteine and other amino acids decreased rapidly at higher thermal temperatures. The amount of larger peptides (1500-5000 Da) decreased at a thermal temperature of 160 °C, while the contents of smaller peptides ( less then 500) increased. Thus, the sensory and instrumental data validate the potential application of GSH-YE in generating beef-like odorants, and furthermore, these outcomes can aid future pragmatic studies for further insight into beef flavor chemistry.Graphene-fiber (GF) supercapacitors have attracted significant research attention in the field of wearable devices. However, there is still a need for active materials with high energy density. Transition Metal Nitrides (TMNs) are promising candidates for this purpose compared with conventional Transition Metal Oxides (TMOs) or conducting polymers (CPs) owing to their higher electrical conductivity, stability and relevant electrochemical properties. We have successfully integrated Tungsten Nitride (WN) with reduced graphene oxide fibers (rGOF) and developed high-performance hybrid fiber (WN-rGOF) supercapacitors. These hybrid supercapacitors attained a high capacitance of 16.29 F cm-3 at 0.05 A cm-3 and an energy density of 1.448 mW h cm-3, which is 7.5 and 1.75 times higher than those of the pure rGOF supercapacitor and the Tungsten Oxide/rGO hybrid fiber (WO3-rGOF) supercapacitor, respectively. The energy density readily increased up to 2.896 mW h cm-3 when three WN-rGOF supercapacitors were connected in series. The WN-rGOF supercapacitor also showed high capacitance retention of 84.7% after 10 000 cycles along with appreciable performance under severe mechanical deformation.Ternary transition metal oxides have attracted increasing attention due to their many merits, and will enhance electrochemical performance via the synergistic effects of the different single metal oxides. Herein, ZnCo2O4 nanoparticles encapsulated in nitrogen-doped carbon (ZnCo2O4@NC) polyhedrons have been successfully prepared through a facile two-step method. The as-prepared products had a uniform size and consisted mainly of interconnected ZnCo2O4 nanoparticles (NPs), which were uniformly distributed in the materials. As a result, the ZnCo2O4@NC polyhedrons of ZnCo-700 show a superb specific capacity of approximately 1601 mA h g-1 over 50 cycles at 0.1 A g-1. selleck A reversible capacity of 1082 mA h g-1 was retained after 300 cycles at 1 A g-1, and a superb reversible capacity of 775 mA h g-1 was attained even when the current density was increased to 5 A g-1. These distinguished electrochemical properties could be ascribed mainly to the uniquely advantageous structural and compositional features.Hydrogen sulfide plays a significant role in living beings, while its abnormal concentration is related to many diseases. Besides, H2S gas is harmful to human beings and the environment. The detection of H2S has therefore attracted much attention in the past several decades. Herein, highly sensitive and selective H2S plasmonic nanoprobes (gold triangular nanoplate core)@(silver shell) (AuTNP@Ag) are reported. By virtue of the high refractive index sensitivity of Au TNPs to the surrounding medium and facile sulfurization of silver by sulfur ions, AuTNP@Ag exhibits great sensitivity to both sulfur ions and H2S gas. The shifts of the plasmon peak are as large as 16 nm for the ventilation of 1 ppm hydrogen sulfide. AuTNP@Ag nanoprobes also exhibit very good sensing linearity at low concentrations of sulfur ions. Moreover, excellent sensing selectivity for sulfur ions is obtained. A type of test gel, which can produce a naked-eye observable color change when exposed to 1-100 ppm hydrogen sulfide gas, is developed using AuTNP@Ag nanoprobes. Owing to the high sensitivity, linearity, and selectivity of the Au TNP@Ag nanoprobes for hydrogen sulfide sensing, this work paves the way for the plasmonic detection of hydrogen sulfide in both biological and environmental applications.Al alloys have widespread industrial applications. However, their mechanical strength is often much lower than steels. Here, we investigate the influence of solutes on achieving ultrahigh strength and thermal stability of nanotwinned Al alloys. In situ micropillar compression tests show the addition of a small amount of Ti can significantly increase the mechanical strength of Al-Ni alloys to 2 GPa. Deformation induced detwinning, Ni segregation and grain coarsening as discovered in binary Al-Ni alloys are mostly absent in the ternary Al-Ni-Ti alloys. Moreover, the ternary Al-Ni-Ti alloys have outstanding thermal stability. Density function theory calculations reveal the synergetic pinning effect of Ni-Ti solute pairs on incoherent twin boundaries. This study demonstrates that the proper selection of synergistic solute pairs is critical to improve the thermal stability and mechanical properties of nanotwinned Al alloys.The effect of short-term intake of high- and low-concentrations of sucrose solution on the neurochemistry of male and female mice was studied. The body weight, feed intake, sucrose solution consumption and brain monoamine neurotransmitters were determined after 34 days' intake of 1% and 8% sucrose solutions. The gene expression and protein levels related to dopamine and opioids were also determined. The results showed that the intake of 1% and 8% sucrose solution for 34 days did not cause significant changes in the weight development of both male and female mice. The preference for sucrose varies with sex. Both males and females had greater preference for the high concentration sucrose solution than the low concentration sucrose solution. The continuous intake of sucrose stimulated the release of monoamine neurotransmitters (DA, 5-HT, NE) in the brains of mice, and the reward effect of 8% sucrose solution is significantly higher than that of 1% sucrose solution. The sex of mice did not affect the release of neurotransmitters. The gene expressions of D1 and D2 were up-regulated in the 1% sucrose group of male mice, while the OPRM1 gene expression was down-regulated. The expression of these three genes in the 8% sucrose group of male mice was all down-regulated, while the gene expressions of D1 and D2 in the 1% and 8% sucrose group (p less then 0.05) of female mice were both up-regulated.An early mechanism for the health benefits of dietary plant phenols is their antioxidant activity in the upper digestive tract. Indeed, these non-essential micronutrients abundant in fruits and vegetables can efficiently fight the iron-induced peroxidation of dietary lipids in the gastric compartment, a recognized form of postprandial oxidative stress. In this work, this phenomenon is investigated through a simple model based on nano-emulsions of trilinoleylglycerol, which permits a direct spectroscopic monitoring and mechanistic insights sustained by extensive kinetic analysis. Polyphenols belonging to the main dietary classes are tested, in particular, flavonols, anthocyanins, flavanols and oligomeric procyanidins. Overall, the common polyphenols tested are good inhibitors of lipid peroxidation induced by metmyoglobin (heme iron) in the early stage of digestion (pH 5-6). For instance, under our peroxidation conditions (2 μM heme, 0.7 mM linoleic acid equivalent, 4.5 mM Brij®35), IC50 concentrations in the range 0.4-1.9 μM were estimated for the set of polyphenols, with oligomeric procyanidins being less inhibitory than the flavanol monomers. However, the polyphenols are ineffective at lower pH (pH 4) when the hematin cofactor is dissociated from its protein (globin). On the other hand, a moderate protection against lipid peroxidation induced by free iron (e.g., released by the oxidative degradation of hematin) persists. This protocol, which combines simplicity and nutritional relevance, could provide a basis for standard tests aimed at assessing the antioxidant capacity of foods and food additives.New technologies such as the Internet of Things and big data have become the strategic focus of national development in the world. Triboelectric nanogenerators are one of the important technologies to solve the problem of distributed energy supply of wireless sensor networks. Since the invention of the triboelectric nanogenerator in 2012, it has attracted extensive attention due to its light weight, low cost, high flexibility, and the diversity of its function. Different from the common rigid inelastic electrode, the elastic electrode is deformable, flexible, and stretchable, which is significant for some specific triboelectric nanogenerators to expand their function. In this review, the latest achievements and research studies of triboelectric nanogenerators based on elastic electrodes are summarized. In addition, the basic classifications, fabrication processes, material selections, structural designs, and working mechanisms regarding the elastic electrode are comprehensively and systematically reviewed. Finally, the future perspectives and remaining challenges of this field are discussed.