14 research outputs found
Ion beam irradiation of ABO4 compounds with the fergusonite, monazite, scheelite, and zircon structures
Corrigendum to âAtomistic simulations of the interactions of helium with dislocations in nickelâ [Nucl. Mater. Energy 07 (2016) 12â19]
Effects of Exogenous Substances Treatment on Fruit Quality and Pericarp Anthocyanin Metabolism of Peach
In this study, the two peach cultivars âBaifengâ and âWeiduanmihongâ were used as experimental materials, and their fruits were sprayed with different concentrations of L-glutamic acid, brassinolide, and sucrose to study the effects of these three exogenous substances on fruit quality and anthocyanin metabolism of peaches. The results showed that the appearance quality (average single fruit weight, fruit firmness, and peel color difference), nutritional quality (soluble solids, soluble sugar, titratable acid, anthocyanins, total phenols, flavonoids, etc.), peel anthocyanin-related enzyme activity, and related gene expression of âBaifengâ and âWeiduanmihongâ peaches treated with three different exogenous substances were different from those of the control. Higher-concentration treatments could significantly improve the appearance of peach fruit, the nutritional quality of peach fruit and the activity of anthocyanin-related enzymes in peel, as well as promote the expression of related genes. Treatment with 400 mg/L L-glutamic acid significantly promoted the average fruit weight of âBaifengâ peaches. Treatment with 800 mg/L L-glutamic acid significantly promoted the increase in PAL enzyme activity and the expression of PpPAL and PpF3H in the two peach varieties and significantly promoted the expression of anthocyanin metabolism genes PpF3â˛H and PpGST1 in âBaifengâ peach peel and anthocyanin metabolism gene PpUFGT in âWeiduanmihongâ peach peel. Treatment with 34 mg/L sucrose significantly increased the fruit firmness of âBaifengâ peaches and the soluble sugar content of âWeiduanmihongâ peaches. Treatment with 51 mg/L sucrose significantly promoted the increase in flavonoid content and PpUFGT expression in âBaifengâ peach fruit and significantly promoted the expression of anthocyanin metabolism genes PpDFR and PpANS in âWeiduanmihongâ peach peel. Treatment with 0.6 mg/L brassinolide significantly promoted the increase in soluble solids (TTS), soluble sugar, anthocyanin, total phenol content, PAL enzyme activity, UFGT enzyme activity, and the expression of anthocyanin metabolism genes PpDFR and PpMYB10.1 in âBaifengâ peach fruit, and it significantly increased the average single fruit weight, fruit hardness, anthocyanin content, and UFGT enzyme activity of âWeiduanmihongâ peach fruit and promoted the expression of anthocyanin metabolism genes PpF3H and PpGST1 in âWeiduanmihongâ peach peel. The comprehensive effect of 0.6 mg/L brassinolide treatment on improving peach fruit quality and increasing anthocyanin content produces the best results and could be popularized in production practices
Insights into the Gut Microbiota of Freshwater Shrimp and Its Associations with the Surrounding Microbiota and Environmental Factors
Elastic, mechanical, electronic, and defective properties of Zr-Al-C nanolaminates from first principles
By means of first principles calculations, Zr-Al-C nanolaminates have been studied in the aspects of chemical bonding, elastic properties, mechanical properties, electronic structures, and vacancy stabilities. Although the investigated Zr-Al-C nanolaminates show crystallographic similarities, their predicated properties are very different. For (ZrC)(n)Al3C2 (n=2, 3, 4), the Zr-C bond adjacent to the Al-C slab with the C atom intercalated in the Zr layers is the strongest, but the one with the C atom intercalated between the Zr layer and Al layer is the weakest. In contrast, the situation for (ZrC)(n)Al4C3 (n=2, 3) is just the opposite. For Zr-Al-C nanolaminates, the calculated bulk, shear and Young's modulus increase in the sequence of Zr2AlC<Zr3AlC2<Zr2Al4C5<Zr3Al4C6<Zr2Al3C4<Zr3Al3C5<Zr4Al3C6. The (ZrC)(n)Al3C2 (n=2, 3, 4) series exhibit the most outstanding elastic properties. In the presence of the external pressure, the bulk and shear moduli exhibit a linear response to the pressure, except for Zr2AlC and Zr3AlC2, both of which belong to the so-called MAX phases. The two materials also exhibit very distinct properties in the strain-stress relationship, electronic structures and vacancy stabilities. As the intercalated Al layers increase, the formation energy of V-Zr and V-Al increases, while the formation energy of V-C decreases
Original Article Detection of COL4A5 gene mutations in Chinese patients with Alportâs syndrome
Background. Mutations in the COL4A5 gene, encoding the 5 chain of type IV collagen, are responsible for X-linked Alportâs syndrome (XLAS), a progressive nephropathy characterized by glomerular basement membrane abnormalities and usually associated with progressive hearing loss and ocular lesions. Methods. In this study, we analysed all 51 exons of the COL4A5 gene in 20 Chinese patients with XLAS or suspected XLAS from 16 families by using polymerase chain reaction (PCR)âdenaturing gradient gel electrophoresis (DGGE) DNA sequencing. Results. Five gene mutations identified in five families were considered to be pathogenic, including one nonsense mutation in exon 1 (266C!T, Gln22Term), two missense mutations in exons 31 (2757G!T, Gly852Val) and 43 (4142C!T, Pro1314Ser), and two splice site mutations in introns 1 and 25 just next to the 30 end of their respective exons (283Ăž1G!T, 2150Ăž1G!T). According to GenBank, these five mutations have not been reported previously. All male patients have typical clinical manifestations and pathological findings that closely correspond to the effects of the mutations. Furthermore, seven gene polymorphisms were detected in introns 18 and 10 and exons 20, 27, 29, 39 and 46. Only the substitution in intron 18 (1234Ăž25G!A) had a gene frequency significantly higher in patients than in normal individuals. Conclusion. Our study demonstrated the critical role of COL4A5 gene mutations in the pathogenesis of XLAS. The linkage of the polymorphism to AS is still unknown
Probing the Structure and Dynamics of Na<sup>+</sup> Ionic Doped LiF Crystals in Fluoride Eutectic Salt by Solid-State NMR
In this study, it was demonstrated that Na+ ionic doped
crystals could be formed during the solidification of FLiNaK melts.
The ionic adulterating behavior between Li+, Na+, and K+ ions was investigated in detail by using various
1D/2D solid-state NMR methods and theoretical calculations. 2D 19Fâ23Na and 19Fâ7Li HETCOR NMR showed that the Na+ ions could be doped
into LiF and KF crystals to generate new adulterating phases. Furthermore,
the doped ionic Na+ ions exhibited different dynamics in
LiF and KF crystals, which is correlated to the bonding length of
the lattice and the NaâF coordinated interactions. This study
provides more insights into the ionic doped crystal phase formation
in such simple alkali metal fluorides, which may be of greater significance
in the application as optical devices