Structural Characterization of Chloroplast Genome in Alpinia japonica(Thunb.)Miq.,a Medicinal Plant of the Genus Alpinia

The analysis of chloroplast gene characteristics in Alpinia japonica(Thunb.)Miq.is of great significance for developing relevant genetic resources.The high-throughput sequencing and bioinformatic research were performed to analyze the chloroplast genome characteristics of A.japonica.The total chloroplast genome length of A.japonica was 161,906 bp,with a typical circular tetrameric structure.And 133 genes were annotated,comprising 87 protein-coding,38 tRNA,and 8 rRNA genes.Furthermore,22 genes contained two copies,and 18 genes owned introns.Repeat sequence analysis showed that it contains 321 simple sequence repeats(SSRs)and 37 long segment repeats.Compared with the chloroplast genomes of eight representative plants in the genus Alpinia,the gene structure,type,and quantity were relatively conservative.Rps12 was the highest variation site in the entire chloroplast gene.A phylogenetic tree showed that the genus Alpinia was the most closely related to the genus Amomum.Meanwhile,A.japonica is the most closely related to Alpinia chinensis belonging to the genus Alpinia.Overall,the chloroplast genome of a new species was reported in the genus Alpinia,and a basis was provided for the utilization of Alpinia plants as a medical resource.

Study on Nutrients and Texture of Pickled Huangzhou Radish

[Objectives]The changes in the nutrient contents and texture of pickled Huangzhou radish with pickling time were studied to further improve its edible value and improve its sensory evaluation.[Methods]Huangzhou radish as a raw material was pickled,and exploration was conducted through the following aspects:with the extension time of pickling time,the changes in nutrient contents such as reducing sugars,free amino acids and ascorbic acid were detected in pickled Huangzhou radish,and the changes in the texture characteristics of pickled Huangzhou radish such as hardness,viscosity,elasticity,recoverable deformation,compression power and chewiness were detected.[Results]As the pickling time became longer,the reducing sugar content in pickled Huangzhou radish gradually increased,and when the pickling time exceeded 13 d,the reducing sugar content showed a downward trend;the ascorbic acid content gradually decreased,and the decreasing rate was relatively lower after the pickling time exceeded 7 d;and the amino acid content first increased and then decreased,and when the pickling time exceeded 13 d,the content exhibited basically no change.The hardness of the radish gradually decreased;the viscosity first decreased and then slowly increased;the recoverable deformation first increased and then decreased;the elasticity first increased and decreased;and the chewiness first increased and then decreased.Through this experiment,it is concluded that the pickled Huangzhou radish has richer nutrients and the best taste when the pickling time is 7-10 d.[Conclusions]This study provides a theoretical reference for producing and processing pickled Huangzhou radish,improving the quality of pickled Huangzhou radish and increasing the nutritional value of the product.

Weis-Fogh Mechanism Mathematic Model of Wave Power Generation Device

A Weis-Fogh mechanism wave power generation system is designed, its physical model and mathematical model are discussed, and the component expressions of fluid dynamic expression are derived. Adopting numerical integral algorithm, the work done by fluid force acting on wing is calculated.

Suppression of partially irreversible phase transition in O′3-Na_(3)Ni_(2)SbO_(6)cathode for sodium-ion batteries by interlayered structural modulation

As a promising cathode material for sodium ion batteries,honeycomb-ordered layered Na_(3)Ni_(2)Sb O_(6)still suffers from rapid capacity fading because of partially irreversible phase transition.Herein,a substitution of Na+by Rb+with a larger ionic radius in honeycomb layered Na_(3)-xRbxNi_(2)Sb O_(6)is proposed to modulate the interlayer structure.The results unveil that biphasic transition reversibility of the intermediate P′3phase is substantially enhanced,and the structure evolution behavior during the charge/discharge process changes due to the structural modulation,which contributes to a suppression of the unfavorable O_(1)phase and an alleviation of the lattice distortion.Moreover,Rb substituted samples exhibited an improved Na+(de)intercalation thermodynamics and kinetics.Attributed to the modifications,the sample with optimized Rb content delivers superior cycle stability and rate capacity,demonstrating a feasible strategy for suppressing irreversible phase transition and developing high-performance honeycomb layered materials for sodium ion batteries.