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Lu Liu,Xiumei Zhang,Dianrong Sun,Tianxiang Gao,Na Song 한국해양과학기술원 2019 Ocean science journal Vol.54 No.2
The population genetic studies of marine fishes usually show complex patterns of genetic differentiation which were influenced by both historical process and contemporary gene flow. Genetic structure of eight different populations for eastern keelback mullet, Liza affinis, collected from the coast along eastern and southern China, was examined using six microsatellite loci. We found strong genetic similarities among most of the samples except the Dongguan population and most microsatellite variation was found within populations. All loci were characterized by high genetic variability with expected heterozygosities ranging from 0.871 to 0.928. The Bayesian cluster analysis of the microsatellite data detected four genetic groups with no relation to geographic areas. The bottleneck results also showed no significant values. Based on these data we postulated that complex marine currents and larval dispersal shaped the genetic structured of studied populations. The present study illustrated the importance of understanding the biological significance of genetic differentiation when using molecular data in identifying units for management and protection.
Acteoside reduces testosterone by inhibiting cAMP, p450scc, and StAR in rat Leydig cells
Shuqiang Liu,Junwen Zhang,Weixuan Li,Tianxiang Zhang,Defu Hu 대한독성 유전단백체 학회 2015 Molecular & cellular toxicology Vol.11 No.1
The present study investigated the in vivo and in vitro effects of acteoside on testosterone production in Sprague-Dawley (SD) rats. The in vivo experiment revealed that acteoside reduced the testosterone level in serum significantly (P⁄0.05). The in vitro experiment also illustrated that acteoside significantly reduced testosterone production in SD rat Leydig cells in primary culture (P⁄0.05). Enzyme-linked immunosorbent assay results demonstrated that acteoside significantly reduced the cyclic adenosine 3′, 5′-monophosphate (cAMP) level (P⁄0.05), and Western blot analysis showed that acteoside significantly reduced cholesterol side-chain cleavage enzyme (p450scc) and steroidogenic acute regulatory (StAR) expression (P⁄ 0.05). Hoechst 33342 staining and Western blotting showed that acteoside did not induce apoptosis in Leydig cells. Together, these results suggest that the acteoside-induced reduction in testosterone production in rat may be at least partially due to down-regulation of cAMP, p450scc, and StAR, but not apoptosis.
Zhang Xiuling,Chen Yuhong,Liu Limeng,Qi Wubin,Hai Wanxiu,Xue Min,Hong Tianxiang 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.4
Silicon carbide (SiC)/graphene nanoplatelets (GNPs) ceramic composites with additions of 0, 1, 2, 4, 6, 8 wt.% GNPs werefabricated by spark plasma sintering (SPS). Effects of GNPs addition on densification, microstructure and mechanicalproperties (vickers hardness and fracture toughness) of the SiC/GNPs composites were investigated. As GNPs contentincreased, relative density of the composites decreased slightly from 99.0% for monolithic SiC to 98.3% at 8 wt.% GPNs. Uniform distribution of GNPs in the microstructure was exhibited. Vickers hardness was increased by 7% (25.4 GPa) inthe 1 wt.% GNPs composition relative to monolithic SiC (23.5 GPa). The Vickers hardness and fracture toughness changesindicated different states of GNPs existence in the SiC/GNPs composites, among which thin-layered GNPs wrapping SiCgrains could benefit Vickers hardness relative to agglomeration of GNPs.
Guan Wang,Pei Zhang,Linyuan Kou,Yan Wu,Tianxiang Wen,Xin Shang,Zhiwen Liu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.2
The hot deformation behavior of the Al-Zn-Mg-Cu alloy was studied by isothermal tensile tests in the temperature range of 200-350 °C and the strain rate range of 0.001-0.1 s -1 . A data-driven deep neural network (DNN) constitutive model and a phenomenological Arrhenius constitutive model were developed for the studied alloy model. The parameters of the DNN model were optimized to improve the prediction accuracy of flow stress. The results show that the accuracy of predictions of the DNN model is better than the Arrhenius model for the hot deformation behavior of 7075 aluminum alloy. The average absolute relative error and correlation coefficient of the DNN model is 1.70 % and 0.9996, respectively. The accuracy of the constitutive model of Arrhenius is relatively low for 7075 aluminum alloy in the range 200-350 °C, 0.001-0.1 s -1 . The optimal network depth and the number of neurons per layer for the analytically optimized DNN constitutive model are 6 and 28, respectively. In addition, the developed DNN model can be effectively applied in intelligent manufacturing, such as short-process highefficiency hot stamping and other plastic-forming technologies.
Regulation of cuticular wax biosynthesis in plants under abiotic stress
Md Shaheenuzzamn,Shandang Shi,Kamran Sohail,Hongqi Wu,Tianxiang Liu,Peipei An,Zhonghua Wang,Mirza Hasanuzzaman 한국식물생명공학회 2021 Plant biotechnology reports Vol.15 No.1
Cuticular waxes are the covering of the outer layer of the plant, consist of hydrocarbon appears like whitish flm or bloom in plant organs. They play a vital role like a safeguard from diferent stress condition in the plant. Since environmental factors are active regulators of cuticular wax biosynthesis, composition, quantity, and deposition, it is evident that cuticular wax is associated with plant stress responses. The diversity of cuticular wax compositions is a proof of the wealth of genes associated in plant wax production. Moreover, a number of wax genes were distinguished in plant/crops at abiotic stress conditions but, regulation of control of those wax genes has not been studied very well in major crop plants at abiotic conditions. A very few transcriptions factors were identifed to regulate the expression level of wax genes of cuticular wax biosynthesis at abiotic stress condition. However, further study is needed to identify more candidate transcriptional regulation factors to cuticular wax production in diferent crop plants in diverse abiotic environments. Therefore, regulation of cuticular wax production under diverse abiotic stresses and the role of transcription factors into the plant cuticular wax accumulation will be helpful to engineer crop plants and improve transgenic crops for stress tolerance. In this review, we focused on a new perspective on transcriptional factors to regulate functional genes of cuticular wax biosynthesis in plants at abiotic stresses.