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A novel fluorescent probe SHK for Zn2+ detection was designed based on the hydrazone Schiff base, successfully synthesized by Suzuki coupling and condensation reactions. The probe SHK in DMSO/H2O showed extremely weak fluorescence. However, the solution exhibited an intensive yellow-green emission with the introduction of Zn2+. In contrast, negligible fluorescence change was observed when other metal ions were added, suggesting a high selectivity of SHK for Zn2+ detection. The Job's Plot analysis revealed that a 1:1 stoichiometric adduct SHK-Zn2+ formed during the Zn2+ sensing. The binding constant of the complex was determined to be 184 M− 1, and the detection limit for Zn2+ was calculated to be 112 µM. Moreover, the probe SHK achieved selective fluorescence sensing for Zn2+ on test strips, which guaranteed its practical application prospect. [ABSTRACT FROM AUTHOR]

The influence of applied magnetic field during annealing process as well as of Mg doping on the room‐temperature magnetoelectric coupling effects in BaSrCo2‐xMgxFe11AlO220≤x≤1.5 are experimentally studied through the magnetization, magnetodielectric, and magnetoelectric current measurements. Hexaferrite samples of Co2Y were found to be highly oriented by an applied magnetic field (Ho) during the annealing process, leading to an enhancement of the room‐temperature magnetoelectric coupling effects. Although the substitution of nonmagnetic Mg ions in Co sites tends to reduce the ferromagnetism at macroscopic scale, a proper amount of Mg doping content facilitates the superexchange interaction between the adjacent magnetic blocks; meanwhile modulates the magnetic anisotropy in the samples. An appropriate adjustment of the competition between the anisotropy and the superexchange could enhance the magnetoelectric coupling at room temperature, which can be confirmed by the magnetic‐field‐induced dielectric constant and current density study. [ABSTRACT FROM AUTHOR]

The influence of applied magnetic field during annealing process as well as of Mg doping on the room‐temperature magnetoelectric coupling effects in BaSrCo2‐xMgxFe11AlO220≤x≤1.5 are experimentally studied through the magnetization, magnetodielectric, and magnetoelectric current measurements. Hexaferrite samples of Co2Y were found to be highly oriented by an applied magnetic field (Ho) during the annealing process, leading to an enhancement of the room‐temperature magnetoelectric coupling effects. Although the substitution of nonmagnetic Mg ions in Co sites tends to reduce the ferromagnetism at macroscopic scale, a proper amount of Mg doping content facilitates the superexchange interaction between the adjacent magnetic blocks; meanwhile modulates the magnetic anisotropy in the samples. An appropriate adjustment of the competition between the anisotropy and the superexchange could enhance the magnetoelectric coupling at room temperature, which can be confirmed by the magnetic‐field‐induced dielectric constant and current density study. [ABSTRACT FROM AUTHOR]

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Tylorrhynchus heterochaetus is a widespread benthic polychaete worm found in coastal brackish waters of the west Pacific. It has high ecological and economic value as a biomarker of water quality and as a high-quality feed in aquaculture and fisheries and is considered a delicacy in some areas of Asia. However, it has experienced a marked reduction in recent years due to overexploitation as well as changes in the environment and climate. Here, to comprehensively understand its genetic background and thus provide insights for better conservation and utilization of this species, we assessed the genetic variability and demographic history of T. heterochaetus individuals sampled from eight locations along the coasts of southeast China and north Vietnam based on mitochondrial cytochrome c oxidase I ( COI ) sequences. We observed high haplotype diversity ( Hd ), with an average of 0.926, but relatively low nucleotide diversity ( π ), with a mean of 0.032 across all samples. A total of 94 polymorphic sites and 85 haplotypes were identified among 320 individuals. The pairwise genetic distances among haplotypes ranged from 0.001 to 0.067, with the high intraspecific divergence possibly reflecting geographic isolation and gene pool fragmentation. Significant genetic structures were revealed among the studied locations; specifically, the eight locations could be treated as six genetically different populations based on pairwise Φ ST results (0.026-0.951, P <0.01). A significant pattern of isolation-by-distance was detected between the genetic and geographic distances ( r =0.873, P =0.001). Three geographic lineages were defined based on phylogenetic tree and network analyses of COI haplotypes. AMOVA results indicated that genetic variations mainly occurred among the three lineages (89.96%). Tests of neutrality and mismatch distribution suggested that T. heterochaetus underwent recent population expansion. These results provide the first report on the genetic status of T. heterochaetus and will be valuable for the management of genetic resources and better understanding of the ecology and evolution in this species.