Time filter

Source Type

Hao Y.,University of Chinese Academy of Sciences | Wang Z.,University of Chinese Academy of Sciences | Gou J.,University of Chinese Academy of Sciences | Dong S.,Beijing National Day School
Arabian Journal of Chemistry | Year: 2015

A new kind of adsorbent graphene oxide nanocomposite (GO-Fe3O4) for removal of Chrysoidine Y was synthesized using the modified Hummers method and co-precipitation. The synthesized GO-Fe3O4 was used as an adsorbent for the removal of Chrysoidine Y from aqueous solution. The effect of initial pH on the adsorption of Chrysoidine Y onto GO-Fe3O4 has been investigated. The adsorption kinetics, isotherm and thermodynamics also have been evaluated. The adsorption was strongly dependent on the pH of medium. The studies on the adsorption revealed that the adsorption process obeyed the Pseudo-second order kinetics model, and the rate-limiting step might be chemical sorption. And the Langmuir isotherm was applicable to describe the adsorption process. This hybrid showed a good performance for the removal of Chrysoidine Y from aqueous solution with an adsorption capacity of 344.83mgg-1 at room temperature, and could be easily removed from solution using a hand-held magnet in 10min. Moreover, the adsorption mechanism was discussed and thermodynamic parameters were determined. Thermodynamic parameters indicated that the adsorption process was exothermic and spontaneous. Above all, the removal efficiency of GO-Fe3O4 was still kept at 96.0% when the concentration of dye was 100mgL-1 in polluted river. This work shows that GO-Fe3O4 is a suitable and efficient adsorbent in the removal of Chrysoidine Y from aqueous solution. © 2015 The Authors.

Fu X.,Beijing National Day School | Liu E.,Beijing Normal University
American Biology Teacher | Year: 2016

We designed a course based on inquiry learning using WISE, an online inquiry-based science environment platform, and the 5E instructional model. This article summarizes guidelines used in designing the course, analyses of student needs and school environment, setting of course objectives, modification of materials, and evaluation of student performance. A "Healthy Life" course based on those guidelines was implemented, along with a teacher-training workshop, in two schools, and pretests and posttests were administered to evaluate the achievements of the project participants. The results showed that the participants had constructed scientific concepts and improved their level of cognitive knowledge. An efficiency questionnaire and semistructured interviews demonstrated the effectiveness of the course, thus indicating that we should share the guidelines and features of the Healthy Life course with other course designers and teachers. © 2016 National Association of Biology Teachers. All rights reserved.

Liu C.,Shandong University | Zhang X.-Y.,Shandong University | Wen X.-R.,Beijing National Day School | Shi M.,Shandong University | And 2 more authors.
International Journal of Systematic and Evolutionary Microbiology | Year: 2016

A yellow-pigmented, rod-shaped, non-flagellated, aerobic and Gram-reaction-negative bacterium, designated strain SM1212T, was isolated from intertidal sand of Kongsfjorden, Svalbard. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain SM1212T constituted a distinct lineage within the family Flavobacteriaceae. It shared highest 16S rRNA gene sequence similarities with the type strains of Bizionia echini (96.0%), Lacinutrix jangbogonensis (95.8%) and Psychroserpens damuponensis (95.7%) and,95.6% sequence similarity with other recognized species in the family Flavobacteriaceae. The strain grew at 4–35 8C and with 0–6.0% (w/v) NaCl. It hydrolysed gelatin, DNA, starch and Tween 80 but did not reduce nitrate to nitrite. The major cellular fatty acids were anteiso- C15: 0, iso-C15: 0, iso-C15: 1 G, anteiso-C15: 1 A, iso-C15: 0 3-OH, C17: 0 2-OH and iso- C17: 0 3-OH and the major respiratory quinone was menaquinone MK-6. Polar lipids included phosphatidylethanolamine, one unidentified phospholipid, one unidentified aminophospholipid, three unidentified aminolipids and nine unidentified lipids. The genomic DNA G+C content of strain SM1212T was 36.6 mol%. On the basis of data from this polyphasic study, strain SM1212T represents a novel species in a new genus in the family Flavobacteriaceae, for which the name Arcticiflavibacter luteus gen. nov., nov., sp. nov. is proposed. The type strain of Arcticiflavibacter luteus is SM1212T (=MCCC 1K00234T=KCTC 32514T). © 2015 IUMS.

Zhang Y.-F.,Beijing Institute of Fashion Technology | Gong Y.,Beijing Institute of Fashion Technology | Qiao B.-H.,Beijing University of Chinese Medicine | Feng T.-L.,Beijing National Day School | Wang W.-Q.,Peking University
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2013

In the present paper, the carbon tetrachloride (CCl4) is the main object of study. According to the calculation of the degree of depolarization, the authors can understand CCl4 crystal vibration. With the comparison between the calculated theoretical value and the experimental value, we are sure that our work is accurate.

Xu X.,CAS Institute of High Energy Physics | Xu X.,University of Chinese Academy of Sciences | Zhao J.,CAS Institute of High Energy Physics | Li Y.,CAS Institute of High Energy Physics | And 7 more authors.
Environmental Pollution | Year: 2016

Mercury (Hg) is a global pollutant that poses a serious threat to human and the environment. Rice was found as an important source for human exposure to Hg in some areas. In this study, the transportation and transformation of IHg and MeHg in rice plants exposed to IHg or MeHg were investigated. The IHg and MeHg concentrations in rice roots and shoots collected every five days were analyzed by HPLC-ICP-MS and SR-XANES. When exposed to MeHg, the percent of IHg in rice roots and shoots increased while MeHg decreased significantly, suggesting prominent demethylation of MeHg occurred. However no notable MeHg was found in both roots and shoots of rice plant when exposed to IHg. SR-XANES analysis further confirmed the demethylation of MeHg with rice. This study provides a new finding that demethylation of MeHg could occur in growing rice, which may be a self-defense process of rice plant. © 2015 Elsevier Ltd. All rights reserved.

Discover hidden collaborations