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RISS 인기검색어
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- 저자 : Yanhong Hao (검색결과 3 건)
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Im, Gi-Sun,Samuel, Melissa,Lai, Liangxue,Hao, Yanhong,Prather, Randall S. JOHN WILEY & SONS LTD 2007 MOLECULAR REPRODUCTION AND DEVELOPMENT Vol.74 No.9
<P>This study investigated the effect of treatment with 6-dimethylaminopurine (6-DMAP) following fusion on in vitro development of porcine nuclear transfer (NT) embryos. Frozen thawed ear skin cells were transferred into the perivitelline space of enucleated oocytes. Reconstructed oocytes were fused and activated with electric pulse in 0.3 M mannitol supplemented with either 0.1 or 1.0 mM CaCl<SUB>2</SUB>. In each calcium concentration, activated oocytes were divided into three groups. Two groups of them were exposed to either ionomycin (I + 6-DMAP or 6-DMAP alone. In experiment 2, fused NT embryos in 0.3 M mannitol containing 1.0 mM CaCl<SUB>2</SUB> were exposed to 6-DMAP either immediately or 20 min after fusion/activation. For 0.1 mM CaCl<SUB>2</SUB>, oocytes activated with either I + 6-DMAP or 6-DMAP alone showed a higher (P < 0.05) developmental rate to the blastocyst stage than those activated with an electric pulse alone (26.7 and 22.5 vs. 12.5%). For 1.0 mM CaCl<SUB>2</SUB>, oocytes activated with either I + 6-DMAP or 6-DMAP alone showed significantly higher (P < 0.05) developmental rate to the blastocyst stage (35.6 and 28.3 vs. 19.8%). Developmental rate to the blastocyst stage was (P < 0.05) increased in NT embryos activated with 6-DMAP 20 min after fusion. 6-DMAP made a higher and wider Ca<SUP>2+</SUP> transient compared to that induced by electric pulses (Fig. 3). The fluctuation lasted during the time that oocytes were cultured in 6-DMAP. Regardless of Ca<SUP>2+</SUP> concentration in fusion medium, activation with 6-DMAP following electric pulses supported more development of porcine NT embryos. Activation of NT embryos with 6-DMAP after fusion in the presence of 1.0 mM CaCl<SUB>2</SUB> could support better developmental rate to the blastocyst stage. Mol. Reprod. Dev. 74: 1158–1164, 2007. © 2007 Wiley-Liss, Inc.</P>
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Im, Gi-Sun,Yang, Boh-Suk,Lai, Liangxue,Liu, Zhonghua,Hao, Yanhong,Prather, Randall S. JOHN WILEY & SONS LTD 2005 Molecular Reproduction and Development Vol.71 No.2
<P>Fragmentation occurs during early developmental stages of electrically activated oocytes and nuclear transfer (NT) embryos. It might contribute to the low developmental rate of porcine NT embryos. The present study was conducted to investigate whether the addition of sugars such as sorbitol or sucrose suppresses fragmentation and supports the development of electrically activated oocytes and NT embryos. The activated oocytes were cultured in Porcine Zygote Medium-3 (PZM-3) supplemented with sorbitol or sucrose for 2 days after electric activation, and then cultured in the PZM-3 for the remaining 4 days. The osmolarities of PZM-3, PZM-3 supplemented with 0.05 or 0.1 M sorbitol, and PZM-3 with 0.05 M sucrose were 269 ± 6.31, 316 ± 3.13, 362 ± 4.37, and 315 ± 5.03 mOsm, respectively. When parthenogentically activated oocytes were cultured in PZM-3 supplemented with 0.05 M sorbitol or sucrose for the first 2 days and then cultured in PZM-3 without sugar, a significantly higher (P < 0.05) cleavage rate and blastocyst rate were observed. Interestingly, addition of sugar to PZM-3 for 2 days reduced the fragmentation rate compared to PZM-3 without sugar. In NT embryos, sugar addition into PZM-3 increased the fusion rate (84.2% ± 6.07 vs. 95.1% ± 2.52), cleavage rate (67.6% ± 5.80 vs. 77.3% ± 3.03), and developmental rate to the blastocyst stage (10.2% ± 0.79 vs. 19.4% ± 1.77). There was no significant difference between treatments for the number of the blastocysts. In addition the fragmentation rate was reduced compared to PZM-3 without sorbitol (26.1 ± 4.30 vs. 14.5 ± 1.74). In conclusion, increasing the osmolarity of PZM-3 through addition of either sorbitol or sucrose for 48 hr increased the cleavage and developmental rate to the blastocyst stage by reducing the fragmentation rate through increasing osmolarity. Mol. Reprod. Dev. 71: 159–165, 2005. © 2005 Wiley-Liss, Inc.</P>
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Huawei Zhang,Hongju Shi,Jiangyan Chen,Ke Zhao,Yanhong Hao 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.11
Activated char obtained by the co-pyrolysis of a mixture of lignite and biomass impregnated with ZnCl2 solution was found to be effective for the high-temperature capture of mercury from syngas. The prepared samples were characterized by X-ray photoelectron spectroscopy, Hg-thermal programmed desorption as well as Brunauer- Emmett-Teller analysis. The results show that activated char exhibits a large surface area as well as abundant micropores and C-Cl, C=O, and COOH functional groups. During the chemisorption of mercury, gaseous Hg0 is first oxidized by C-Cl to HgCl2; HgCl2 which acts as the intermediate product then reacts with the C=O and COOH functional groups on the surface of activated char to generate Hg-OM. At high adsorption temperatures, Hg-OM on the adsorbent surface can further decompose and generate HgO. The C-Cl group is important for the first oxidation step of gaseous Hg0, and the formation of HgCl2 is the rate-determining step for the entire process of adsorption.
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