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Zi-Xiang Xu,Joo-Chang Park,Hueon Namkung,Li-Hua Xu,Hyung-Taek Kim 한국열환경공학회 2019 한국열환경공학회 학술대회지 Vol.2019 No.춘계
The co-combustion of low-rank coal with biomass is regarded as a prospective technology for reducing CO2 emissions to mitigate the issues related to the excess global warming. However, the ash deposition and fine particle formations problems were severe with the addition of biomass. Therefore, it is vital to investigate ash deposition and fine particle formation to ensure the normal operation of equipment in thermal power plant and improve thermal conversion efficiency as well as protect air environment. In this study, two types of raw coals (Berau coal, Bayan coal) and three types of hybrid coals (Berau coal impregnated with 10 wt%, 20 wt% molasses; and Bayan coal impregnated with 3 wt% molasses) are used as the samples to conduct DTF experiment. The propensity associated with ash deposition and fine particle formation are studied at excess air under combustion temperature of 1300℃. The ash deposits generated at the probe top surface maintained at 800℃, and the fine particles carried by the flue gas were collected by the filter paper. A range of analytical techniques including SEM-EDX and XRD were used to analyze the morphology and elemental distribution of ash deposits and fine particles for clarifying the ash deposits behavior. It is found that the deposition tendency of 3% HCK is lower than other fuels. As far as the fine particle formation is concerned, the contents of Si and Al in coarse particles were apparently higher than those in fine particle. S and K is higher in fine particles.
Zi-Li Lin,Ying-Hua Li,Yong-Nan Xu,Suk Namgoong,Xiang-Shun Cui,Nam-Hyung Kim 한국동물생명공학회(구 한국동물번식학회) 2013 Reproductive & Developmental Biology(Supplement) Vol.37 No.2s
Growth differentiation factor 9 (GDF9) and bone morphogenetic protein 15 (BMP15) are members of the transforming growth factor β (TGF-β) family, and their roles in oocyte maturation and cumulus expansion are well known in the mouse and human, but not in the pig. We investigated GDF9 and BMP15 expression in porcine oocytes during in vitro maturation. A significant increase in the mRNA levels of GDF9 and BMP15 was observed at germinal vesicle breakdown, with expression levels peaking at metaphase I (MI) but decreasing at metaphase II (MII). GDF9 and BMP15 protein localized to the oocyte cytoplasm. While treatment with GDF9 and BMP15 increased cumulus expansion and the expression of genes involved in both oocyte maturation (c-mos, cyclinb1, and cdc2) and cumulus expansion (has2, ptgs2, ptx3, and tnfaip6). SB431542 (a TGFβ–GDF9 inhibitor) decreased meiotic maturation at MII. Following parthenogenetic activation, the percentage of blastocysts in SB431542 treatment was lower than in the control (74.4% and 41.3%, respectively). Treatment with GDF9 and BMP15 also increased the mRNA levels of maternal genes such as c-mos (a regulatory subunit of mitogen-activated protein kinase (MAPK)), and cyclinb1 and cdc2 (regulatory subunits of maturation/M phase promoting factor (MPF)); however, SB431-542 significantly decreased their mRNA levels. These data were supported by poly (A)-test PCR and protein activity analyses. Our results show that GDF9 and BMP15 function in cumulus expansion and that they stimulate MPF and MAPK activity in porcine oocytes during in vitro maturation.
Suppressive Effect of Sinomenine Combined with 5-Fluorouracil on Colon Carcinoma Cell Growth
Zhang, Ji-Xiang,Yang, Zi-Rong,Wu, Dan-Dan,Song, Jia,Guo, Xu-Feng,Wang, Jing,Dong, Wei-Guo Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.16
It is reported that sinomenine (SIN) and 5-fluorouracil (5-FU) both are effective for colon cancer, but their cooperative suppressive effects and toxicity remain to be clarified in detail. This study aimed to determine suppressive effects and toxicity of sinomenine (SIN) plus 5-fluorouracil (5-FU) on LoVo colon carcinoma cells in vitro and in vivo. CCK-8, Hoechst 33258 staining and an annexin V-FITC/PI apoptosis kit were used to detect suppressive effects. Western blotting was applied to investigate the essential mechanism underlying SIN and 5-FU-induced apoptosis. SIN or 5-FU or both were injected into nude mice, and then suppressive effects and side effects were observed. SIN plus 5-FU apparently inhibited the proliferation of LoVo cells and induced apoptosis. Moreover the united effects were stronger than individually (p<0.05). The results of annexin V-FITC/PI staining and Hoechst 33258 staining showed that the percentage of apoptotic cells induced by SIN and 5-FU combined or alone was significantly higher than the control group (p<0.05). Expression of Bax and Bcl-2 was up-regulated and down-regulated respectively. SIN or 5-FU significantly inhibited effects on the volume of tumour xenografts and their combined suppressive effects were stronger (p<0.05). No obvious side effects were observed. It was apparent that the united effects of SIN and 5-FU on the growth of colorectal carcinoma LoVo cells in vitro and in vivo were superior to those using them individually, and it did not markedly increase the side effects of chemotherapy.
Li, Jie,Yang, Chun-Xu,Mei, Zi-Jie,Chen, Jing,Zhang, Shi-Min,Sun, Shao-Xing,Zhou, Fu-Xiang,Zhou, Yun-Feng,Xie, Cong-Hua Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.10
Cancer patients often suffer from local tumor recurrence after radiation therapy. Cell cycling, an intricate sequence of events which guarantees high genomic fidelity, has been suggested to affect DNA damage responses and eventual radioresistant characteristics of cancer cells. Here, we established a radioresistant lung cancer cell line, A549R, by exposing the parental A549 cells to repeated ${\gamma}$-ray irradiation with a total dose of 60 Gy. The radiosensitivity of A549 and A549R was confirmed using colony formation assays. We then focused on examination of the cell cycle distribution between A549 and A549R and found that the proportion of cells in the radioresistant S phase increased, whereas that in the radiosensitive G1 phase decreased. When A549 and A549R cells were exposed to 4 Gy irradiation the total differences in cell cycle redistribution suggested that G2-M cell cycle arrest plays a predominant role in mediating radioresistance. In order to further explore the possible mechanisms behind the cell cycle related radioresistance, we examined the expression of Cdc25 proteins which orchestrate cell cycle transitions. The results showed that expression of Cdc25c increased accompanied by the decrease of Cdc25a and we proposed that the quantity of Cdc25c, rather than activated Cdc25c or Cdc25a, determines the radioresistance of cells.