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High catalytic performance of CuO nanocrystals with largest defects
Chunfang Zhang,Yuping Sun,Yunxiang Bai,Yanqi Yin,Jin Gu 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2
To improve the calalytic performance of CuO, nanometer-sized CuO particles were prepared with ultrafiltration surface contact method (UMSCM). X-ray powder diffraction (XRD) and scanning electron microscopy (SEM)were used to characterize the crystal structure and morphology of the particles made with UMSCM, hydrothermal method,grounding method as well as a commercial one. SEM results illustrate that UMSCM prepared CuO particles mainly show the form of orthorhombic sliced crystals with the largest amounts of defects compared to CuO particles made by the other three methods. In the oxidation of cumene, CuO prepared with UMSCM also shows better catalytic performance than the other three particles, which can be ascribed to its smaller particle sizes and larger defects so as to accelerate the surface adsorption rate of O_2 molecules and the diffusion of ions and atoms, thus improving the catalytic activity.
Zhang Chunfang,Chen Dunjin,Liu Xianbao,Du lili,Chen Dunjin 대한독성 유전단백체 학회 2016 Molecular & cellular toxicology Vol.12 No.1
The congener brominated diphenyl ether- 209 (BDE-209) is a high-bromine polybrominated diphenyl ether (PBDE) and a common flame retardant that is applied to electronic equipment. In this study, we investigated the effects of BDE209 on the regulation of proliferation and apoptosis of neural stem cells (NSCs) and determined the underlying protein alterations. We cultured NSCs and exposed them to different BDE-209 concentrations to assess the effects of BDE209 on cell proliferation. Flow cytometric assays were used to assess the effects of BDE209 on apoptosis and to determine the underlying mechanisms. The expression levels of nuclear factor kappa B (NF-κB), apoptotic-associated protein cleaved caspase-3 and caspase-3, phosphorylated extracellular signal-regulated kinase (ERK) and c-Jun N-terminal protein kinase (JNK) were analyzed by western blot assays. Our data indicated that BDE-209 decreased NSC proliferation in a concentration-dependent manner. BDE-209 induced the activation of NF-κB; however, the expression levels of phosphorylated JNK1/2 (p-JNK1/2) and phosphorylated ERK1/2 (p-ERK1/2) were not altered. Furthermore, BDE209 increased apoptosis and protein levels of cleaved caspase 3, whereas the NF-κB inhibitor pyrrolidine dithiocarbamate (PDTC) attenuated BDE-209-induced apoptosis. In conclusion, BDE209 inhibits NSC proliferation in vitro, and BDE209 is able to induce apoptosis, which may be associated with the activation of NF-κB pathways.
( Dongdong Zhang ),( Yi Wang ),( Chunfang Zhang ),( Dan Zheng ),( Peng Guo ),( Zongjun Cui ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.2
A microbial consortium, TMC7, was enriched for the degradation of natural lignocellulosic materials under high temperature. TMC7 degraded 79.7% of rice straw during 15 days of incubation at 65°C. Extracellular xylanase was effectively secreted and hemicellulose was mainly degraded in the early stage (first 3 days), whereas primary decomposition of cellulose was observed as of day 3. The optimal temperature and initial pH for extracellular xylanase activity and lignocellulose degradation were 65°C and between 7.0 and 9.0, respectively. Extracellular xylanase activity was maintained above 80% and 85% over a wide range of temperature (50-75°C) and pH values (6.0-11.0), respectively. Clostridium likely had the largest contribution to lignocellulose conversion in TMC7 initially, and Geobacillus, Aeribacillus, and Thermoanaerobacterium might have also been involved in the later phase. These results demonstrate the potential practical application of TMC7 for lignocellulosic biomass utilization in the biotechnological industry under hot and alkaline conditions.
FSHR Gene Mutation and Its Effect on Litter Size in Pigs
Zhang, Shujun,Xiong, Yuanzhu,Den, Changyan,Xiao, Senmu,Xu, Jianxiang,Xia, Yu,Liu, Xiaohua,Wang, Chunfang,Sun, Shulin Asian Australasian Association of Animal Productio 2004 Animal Bioscience Vol.17 No.2
The polymorphism of the locus FSHRB in intron6-Exon7 of FSHR gene was investigated by PCR-RFLPs in Erhualian, Large White and Landrace${\times}$Large White; The association of polymorphism and litter size was analyzed by using SAS. The results showed that 1) the polymorphism of the locus FSHRB was significantly associated with litter size; 2) the total born number (TBN) and number born alive (NBA) of the sows with BB genotype were increased (p<0.05) with additive effects of 1.02-1.42 and 1.04-1.27 pigs per litter, respectively; 3) among the sows with genotype AA, AB or BB, there was an insignificant difference in born weight and weaning weight. This gene may be an effective potential tool used in conjunction with traditional selection methods.
Association of microRNA-3144 variant with the susceptibility to hepatocellular carcinoma
Jun Zhang,Yi Liu,Jie Liu,Rui Wang,Min Cai,Shunji Yu,Yanyun Ma,Weihong Xu,Chunfang Gao,Jiucun Wang,Lifang Hou 한국유전학회 2014 Genes & Genomics Vol.36 No.6
Increasing studies suggest that microRNAs, anew group of small non-coding molecules, regulate theexpression of their target genes and play some roles in cancers. Thus, it is hypothesized that the genetic variants ofmicroRNAs could contribute to the susceptibility to cancers. In this study, the association between rs67106263 in microRNA-3144 and the risk of hepatocellular carcinoma (HCC)was explored in a large-scaled case–control population basedon MassARRAY technology. It was discovered that comparedwith the carriers of wide-type GG genotype and heterozygoteGA genotype of microRNA-3144, thesignificantly increased risk of HCC was observed in thesubjects with the homozygote variant AA (adjusted oddsratio = 1.285, 95 % confidence interval = 1.004–1.643,P = 0.046). Additionally, the variant was also associatedwith the expression of alpha fetoprotein (AFP), which is thediagnostic marker for HCC. Our findings suggest for the firsttime that rs67106263 may play some roles in the risk of HCC,expecting future molecular researches to elucidate the possiblemechanisms behind these results.
Shichen Li,Hanghai Zhou,Chunlei Chen,Feng Zeng,Gang Zheng,Xingpeng Wang,Chunfang Zhang 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.4
A laboratory-scale study was conducted to investigate the effect of rhamnolipids (RLs) supplement on the amelioration of saline-alkali soils. The RLs supplement improved the soil aggregates stability and promoted the formation of macro-aggregates which increased by up to 10.84% and 15.92% in alkaline soil and saline soil, respectively. In addition, RLs amendment led to a pH reduction from initial 8.87 to 7.80-7.84 in alkaline soil, and a salt rejection up to 20.72% in saline soil, remarkably alleviating the saline-alkali stress on microorganisms and plants. Meanwhile, microbial growth and activity as well as the seed germination performance were greatly improved in both types of soil. Furthermore, RLs addition greatly altered the microbial community structure and supported the proliferation of bacterial species (e.g., Pseudomonas oleovorans, Pseudomonas stutzeri, and Alcanivorax dieselolei) that favored the improvement of soil properties and nutrients circulation, thus markedly enhancing the microecological functions including carbon and nitrogen metabolisms. Further supplement of γ-PGA only exhibited promoting effect on aggregates formation and microbial growth and activity. The findings obtained in this study prove the application of RLs as a promising approach for saline-alkali soil amelioration.
( Xiuhua Yu ),( Jianyuan Yin ),( Lin Li ),( Chang Luan ),( Jian Zhang ),( Chunfang Zhao ),( Shengyu Li ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.7
In the present work, the in vitro prebiotic activity of xylooligosaccharides (XOS) derived from corn cobs combined with Lactobacillus plantarum, a probiotic microorganism, was determined.These probiotics exhibited different growth characteristics depending on strain specificity. L. plantarum S2 cells were denser and their growth rates were higher when cultured on XOS. Acetate was found to be the major short-chain fatty acid produced as the end-product of fermentation, and its amount varied from 1.50 to 1.78 mg/ml. The antimicrobial activity of XOS combined with L. plantarum S2 was determined against gastrointestinal pathogens. The results showed that XOS proved to be an effective substrate, enhancing antimicrobial activity for L. plantarum S2. In vivo evaluation of the influence of XOS and L. plantarum S2, used both alone and together, on the intestinal microbiota in a mouse model showed that XOS combined with L. plantarum S2 could increase the viable lactobacilli and bifidobacteria in mice feces and decrease the viable Enterococcus, Enterobacter, and Clostridia spp. Furthermore, in the in vitro antioxidant assay, XOS combined with L. plantarum S2 possessed significant 2,2-diphenyl-1- picrylhydrazyl, 2,2’-azino-bis, and superoxide anion radical-scavenging activities, and the combinations showed better antioxidant activity than either XOS or L. plantarum S2 alone.