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( Haiming Tang ),( Li Wen ),( Kaikai Cheng ),( Chao Li ),( Lihong Shi ),( Weiyan Li ),( Yong Guo ),( Xiaoping Xiao ) 한국미생물생명공학회 2024 Journal of microbiology and biotechnology Vol.34 No.7
Soil extracellular enzyme plays a vital role in changing soil nitrogen (N) mineralization of rice field. However, the effects of soil extracellular enzyme activities (EEA) and microbial community composition response to N mineralization of rice field under short-term tillage treatment needed to be further explored. In this study, we investigated the impact of short-term (8-year) tillage practices on rhizosphere soil N transformation rate, soil enzyme activities, soil microbial community structure, and the N mineralization function gene abundances in double-cropping rice field in southern China. The experiment consisted of four tillage treatments: rotary tillage with crop straw input (RT), conventional tillage with crop straw input (CT), no-tillage with crop straw retention (NT), and rotary tillage with all crop straw removed as a control (RTO). The results indicated that the rhizosphere soil N transformation rate in paddy field under the NT and RTO treatments was significantly decreased compared to RT and CT treatments. In comparison to the NT and RTO treatments, soil protease, urease, β-glucosaminidase, and arginase activities were significantly improved by the CT treatment, as were abundances of soil sub, npr, and chiA with CT and RT treatments. Moreover, the overall diversity of soil bacterial communities in NT and RTO treatments was significantly lower than that in RT and CT treatments. Soil chitinolytic and bacterial ureolytic communities were also obviously changed under a combination of tillage and crop straw input practices.
Evaluation of suitable qRT-PCR normalization genes for various citrus rootstocks
He Wen,Xie Rui,Li Huan,Wang Yan,Chen Qing,Lin Yuanxiu,Zhang Yunting,Luo Ya,Zhang Yong,Tang Haoru,Wang Xiaorong 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.1
Citrus rootstock can modify plant growth and enhance stress resistance. There are many genotypes and species used as citrus rootstocks. Although multiple citrus rootstocks whole genome sequence and transcriptome databases have previously been published, no suitable internal reference genes have been investigated for standardization of gene expression via quantitative real-time PCR. Here we reported the first systematic and comprehensive analysis of reference genes for quantitative real- time PCR standardization in various citrus rootstocks. The expression stability of ten candidate reference genes in diverse sample subsets of flooding, drought, alkaline and cold treatments was evaluated using four statistical algorithms, geNorm, NormFinder, BestKeeper and ΔCt method. The results demonstrated that the expression stability of reference genes varied under different experimental conditions. In addition, normalization of gene expression of 9-cis-epoxycarotenoid dioxygenase 3 (NCED 3), involved in abscisic acid biosynthesis, was conducted to further confirm the reliability of the reference genes. Overall, EF-1α, DIM 1, GAPC and UBC expressed much more stably. ACTIN and GAPDH were not recommended for normalization in given experimental conditions due to low stability. Our main contribution was to identify reference genes with suitable and stable expression in citrus rootstocks varied across selected experimental conditions. Furthermore, these results will provide valuable information for future research on citrus rootstocks.
Mu, Yong-Ping,Tang, Song,Sun, Wen-Jie,Gao, Wei-Min,Wang, Mao,Su, Xiu-Lan Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.20
Dysregulated expression of microRNAs (miRNAs) has been shown to be closely associated with tumor development, progression, and carcinogenesis. However, their clinical implications for gastric cancer remain elusive. To investigate the hypothesis that genome-wide alternations of miRNAs differentiate gastric cancer tissues from those matched adjacent non-tumor tissues (ANTTs), miRNA arrays were employed to examine miRNA expression profiles for the 5-pair discovery stage, and the quantitative real-time polymerase chain reaction (qRTPCR) was applied to validate candidate miRNAs for 48-pair validation stage. Furthermore, the relationship between altered miRNA and clinicopathological features and prognosis of gastric cancer was explored. Among a total of 1,146 miRNAs analyzed, 16 miRNAs were found to be significantly different expressed in tissues from gastric cancer compared to ANTTs (p<0.05). qRT-PCR further confirmed the variation in expression of miR-193b and miR-196a in the validation stage. Down-expression of miR-193b was significantly correlated with Lauren type, differentiation, UICC stage, invasion, and metastasis of gastric cancer (p<0.05), while over-expression of miR-196a was significantly associated with poor differentiation (p=0.022). Moreover, binary logistic regression analysis demonstrated that the UICC stage was a significant risk factor for down-expression of miR-193b (adjusted OR=8.69; 95%CI=1.06-56.91; p=0.043). Additionally, Kaplan-Meier survival curves indicated that patients with a high fold-change of down-regulated miR-193b had a significantly shorter survival time (n=19; median survival=29 months) compared to patients with a low fold-change of down-regulated miR-193b (n=29; median survival=54 months) (p=0.001). Overall survival time of patients with a low fold-change of up-regulated miR-196a (n=27; median survival=52 months) was significantly longer than that of patients with a high fold-change of up-regulated miR-196a (n=21; median survival=46 months) (p=0.003). Hence, miR-193b and miR-196a may be applied as novel and promising prognostic markers in gastric cancer.
A Numerical Method of the Ship Structures Analysis Based on Meshless Local Petrov-Galerkin Method
Jianping Chen,Wen-yong Tang,Man-ping Xu 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.4
The paper presents a numerical simulation method for ship structures based on meshless local Petrov-Galerkin method. The proposal method is a suitable for adaptive computation method while processing the displacement and stress fields of the ship structures in high-gradient regions. Above all, based on the theory of Mindlin-Reissner plate, the field approximation function of the displacement is obtained by employing Moving-least Square method, and then the governing equation and the stiffness matrix of the structures are established. Numerical demonstrations show the solutions of the presented method are good agreement between FEM-ANSYS and the proposed approach, which verifies the validity of the presented method for the ship structures analysis.
Regeneration of commercial SCR catalyst deactivated by arsenic poisoning in coal-fired power plants
Qiang Lu,Zulfiqar Ali,Hao Tang,Tahir Iqbal,Zulqarnain Arain,Min-shu Cui,Ding-jia Liu,Wen-yan Li,Yong-ping Yang 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.3
Arsenic species, which are inevitable components in flue gas from the coal combustion process, will result in severe deactivation of selective catalytic reduction (SCR) catalysts. In this paper, a novel method is proposed to regenerate the arsenic-poisoned commercial V2O5-MoO3/TiO2 catalyst collected from coal-fired power plants, including ammonia washing, H2 reduction, and air calcination. Activity tests indicated that the proposed method could recover the catalyst activity more than 96% of the fresh catalyst. Furthermore, detailed characterizations results indicated that this regeneration method could not only effectively remove the arsenic species, but also recover the active constituents of the catalysts to a considerable level. The proposed method offers a feasible strategy for the regeneration of poisoned commercial SCR catalysts and can effectively reduce the total denitrification cost for coal-fired power plants.