http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ping Tao,Mihua Shao,Chengwen Song,Shuaihua Wu,Murong Cheng,Zhi Cui 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Mn2O3 microspheres are prepared and used as adsorbent for removal of heavy metal ions. Morphology and structure of Mn2O3 microspheres are analyzed by SEM, TEM, XRD, XPS and N2 sorption technique. Effects of adsorbent concentration, ion concentration and agitation time on adsorption behavior are investigated. Adsorption isotherm and kinetics are also studied. The results show Mn2O3 microspheres have well-developed porous and hollow structure, demonstrating good potential on removal of heavy metal ions. Adsorption data fit better with Freundlich isotherms than Langmuir isotherms. Kinetic studies indicate adsorption behavior is described by pseudo-second-order kinetic model, and intraparticle diffusion plays a significant role.
Terahertz Spectral Characteristics of Electrolyte Solutions under Different Magnetic Fields
Siyu Shao,Haiyun Huang,Bo Peng,Guoyang Wang,Ping Ye,Jiahui Wang,Bo Su,Hailin Cui,Cunlin Zhang 한국광학회 2022 Current Optics and Photonics Vol.6 No.3
Microfluidic chips are new devices that can manipulate liquids at the micrometer level, and terahertz (THz) time-domain spectroscopy has good applicability in biochemical detection. The combination of these two technologies can shorten the distance between sample and THz wave, reduce THz wave absorption by water, and more effectively analyze the kinetics of biochemical reactions in aqueous solutions. This study investigates the effects of different external magnetic field intensities on the THz transmission characteristics of deionized water, CuSO 4 , CuCl 2 , (CH 3 COO) 2 Cu, Na 2 SO 4 , NaCl, and CH 3 COONa; the THz spectral intensity of the sample solutions decrease with increasing intensity of the applied magnetic field. Analysis shows that the magnetic field leads to a change in the dipole moment of water molecules in water and electrolyte solutions, which enhances not only the hydrogen-bond networking ability of water but also the hydration around ions in electrolyte solutions, increasing the number of hydrogen bonds. Increasing the intensity of this magnetic field further promotes the hydrogen-bond association between water molecules, weakening the THz transmission intensity of the solution.
Zhang, Ding-Xiao,Li, Xiao-Ping,Sun, Shao-Chen,Shen, Xing-Hui,Cui, Xiang-Shun,Kim, Nam-Hyung Wiley Subscription Services, Inc., A Wiley Company 2010 Molecular reproduction and development Vol.77 No.5
<P>Calcium is one of the most ubiquitous signaling molecules, and controls a wide variety of cellular processes. It is mainly stored in the endoplasmic reticulum (ER), bound to lumenal proteins. Calreticulin is the major Ca<SUP>2+</SUP>-binding chaperone in oocytes, and is integral to numerous cellular functions. To better understand the role of the ER– calreticulin–Ca<SUP>2+</SUP> pathway in oocyte maturation and early embryogenesis, we characterized the porcine calreticulin gene and investigated its expression profile during oocyte maturation and early embryonic development. Calreticulin was widely expressed in pig tissues and its transcripts were downregulated during maturation, especially at 44 hr, and were undetectable at the blastocyst stage. We also investigated the effect of increased cytosolic Ca<SUP>2+</SUP> induced by the Ca<SUP>2+</SUP>-ATPase inhibitor, cyclopiazonic acid (CPA), on pig oocyte maturation and maternal gene expression. CPA at 10 µM did not inhibit germinal vesicle breakdown, but did result in the arrest of 38.6% oocytes at or before the MI stage. In addition, expression of the maternal genes C-mos, BMP15, GDF9, and Cyclin B1 was significantly increased in CPA-treated MII oocytes compared with control groups. These data were supported by the results of poly(A)-test PCR, which revealed that the cyclin B1 short isoform (CB-S), GDF9, and C-mos underwent more intensive polyadenylation modification in CPA-treated oocytes than control oocytes, suggesting that polyadenylation may influence Ca<SUP>2+</SUP>-modulated changes in gene expression. Furthermore, CPA treatment decreased the percentage of four-cell parthenotes that developed into blastocysts, suggesting the need for functional SR/ER Ca<SUP>2+</SUP>-ATPase pumps or Ca<SUP>2+</SUP> signals during early embryo development after zygotic genome activation. Together, these data indicate that ER–calreticulin-associated Ca<SUP>2+</SUP> homeostasis plays a role in oocyte and embryo development, and that alterations in maternal gene expression may contribute to the underlying molecular mechanism, at least partially, via polyadenylation. Mol. Reprod. Dev. 77: 462–471, 2010. © 2010 Wiley-Liss, Inc.</P>