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Effect of reactive surface area of minerals on mineralization trapping of CO_2 in saline aquifers

Petroleum Science 2012年第3期9卷 400-407页

作者： luo shu XU Ruina JIANG Peixue Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Beijing Key Laboratory of CO_(2) Utilization and Reduction TechnologyDepartment of Thermal EngineeringTsinghua UniversityBeijing 100084China

The reactive surface area, an important parameter controlling mineral reactions, affects the amount of mineralization trapping of CO2 which affects the long-term CO2 storage. The effect of the reactive surface area on the mineralization trapping of CO2 was numerically simulated for CO2 storage in saline aquifers. Three kinds of minerals, including anorthite, calcite and kaolinite, are involved in the mineral reactions. This paper models the relationship between the specific surface area and the grain diameter of anorthite based on experimental data from literature （Brantley and Mellott, 2000）. When the reactive surface areas of anorthite and calcite decrease from 838 to 83.8 m^2/m^3, the percentage of mineralization trapping of CO： after 500 years decreases from 11.8% to 0.65%. The amount of dissolved anorthite and the amounts of precipitated kaolinite and calcite decrease significantly when the reactive surface areas ofanorthite and calcite decrease from 838 to 83.8 m2/m3. Calcite is initially dissolved in the brine and then precipitates during the geochemical reactions between CO2-H20 and the minerals. Different reactive surface areas of anorthite and calcite lead to different times from dissolution to precipitation. The pH of the brine decreases with decreasing reactive surface areas of anorthite and calcite which influences the acidity of the saline aquifer. The gas saturation between the upper and lower parts of the saline aquifer increases with decreasing reactive surface areas of anorthite and calcite. The mass density distribution of brine solution shows that the CO2^＋brine solution region increases with decreasing reactive surface areas ofanorthite and calcite.

关键词： Reactive surface area, mineralization trapping, dissolution precipitation, brine mass density,CO2 geological storage

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Experimental study on pressure and aeration characteristics in stepped chute flows

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Science China(Technological Sciences) 2015年第4期58卷 720-726页

作者： XU Wei Lin luo shu Jing ZHENG Qiu Wen luo Jing State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University

The free flow on the step surfaces has received much attention for its representative body type,flow structure,water-air two phase flow,cavitation,and many complex *** experiments about the time-averaged pressure and aeration concentration distribution on the step surface show that the vertical plane of steps will inevitably experience negative pressure,which must rely on adequate aeration concentration to avoid cavitation ***,the self-aerated flow at the head section has a relatively low aeration concentration,and the concentration of the entire steps decreases with the increasing of weir head,the minimum appears in the vicinity of the corner,and the location is close to the minimum ***,it is necessary to set aerator in the upstream end of the step surfaces to avoid cavitation damage.

关键词： stepped spillway time-averaged pressure aerated flow cavitation erosion

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How the white tiger lost its color, but kept its stripes

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Science China(Life Sciences) 2014年第10期57卷 1041-1043页

作者： XU Xiao luo shu-Jin College of Life Sciences Peking-Tsinghua Center for Life Sciences Peking University

The fantastic range of animal coloration is produced by pigment particles of colored material or microscopic struc- tures in scales, bristles or feathers that give rise to brilliant iridescent colors. In mammals, except for a few exceptions involving nanoor micro-scale structural color （e.g., the blue faces of male baboons）, fur color is determined by the pigment melanin. Melanin is synthesized and stored in melanosomes, a lysosomal organelle of melanocyte, and transferred to adjacent keratinocytes and hairs. There are two types of melanin： eumelanin （black to brown） and pheomelanin （red to yellow）. The amount, ratio and distribution of eumelanin and pheomelanin in hair determine the coat color of an animal： everything from bright white to light cream to red to iet black.

关键词：颜色黑素细胞白虎条纹哺乳动物颜料颗粒微观尺度黑色素

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Taxonomic species recognition should be consistent

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National Science Review 2022年第12期9卷 17-18页

作者： Stephen J.O'Brien shu-Jin luo Guy Harvey Oceanographic Center Halmos College of Arts and Sciences Nova Southeastern University The State Key Laboratory of Protein and Plant Gene Research School of Life Sciences and Peking-Tsinghua Center for Life Sciences Academy for Advanced Interdisciplinary Studies Peking University

Criteria for species naming have been contentious since the time of Carl *** no clear’right or wrong’convention for species naming,biologists strive to simply convince their *** NSR compendium offers detailed guidance [1-6] that adds quantitative genomic inference to the *** taxonomic assemblages (***,fish,fungi,insects,terrestrial and marine invertebrates,plants,bacteria) are sufficiently distinctive that any generalization is fraught with natural exceptions.

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Application of silica-alumina as hydrothermally stable supports for Pt catalysts for acid-assisted soot oxidation

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Rare Metals 2023年第5期42卷 1614-1623页

作者： shu-Ran Liu shu-Ting luo Xiao-Dong Wu Tao-Jin Wang Rui Ran Duan Weng Zhi-Chun Si shuang Liu Key Laboratory of Advanced Materials of Ministry of Education of China School of Materials Science and EngineeringTsinghua UniversityBeijing100084China International Graduate School at Shenzhen Tsinghua UniversityShenzhen518055China School of Materials Science and Engineering Ocean University of ChinaQingdao266100China

In this work,silica-alumina mixed oxides with different SiO_(2)contents(5%and 30%)were adopted as acidic supports for platinum catalysts for soot *** obtained catalysts were hydrothermally aged in 10%H_(2)0/air at 750℃for 20 *** catalysts were characterized by X-ray diffraction(XRD),N_(2)adsorption,inductively coupled plasma(ICP),CO chemisorption,NH3temperature-programmed desorption(TPD),infrared(IR)spectroscopy of CO adsorption,temperature-programmed oxidation(TPO)of NO,and TPD of NO_(x).The surface acidity of catalyst was positive correlated with the content of SiO_(2),which kept platinum in metallic and partially oxidized states in an oxidizing *** with sulfation treatment on the alumina support,the application of SiO_(2)-Al_(2)O_(3)mixed oxides does not result in the coverage of Pt active sites and the prepared catalysts exhibit excellent activity for NO *** promote NOxpreferential adsorption on soot and decomposition of surface oxygenated compounds(SOCs)as the sulfated Pt/Al_(2)O_(3)catalyst does.

关键词： Platinum Acidic support Diesel soot Hydrothermal aging

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FOXP4 promotes proliferation of human spermatogonial stem cells

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Asian Journal of Andrology 2023年第3期25卷 322-330页

作者： shu-Wei luo Le Tang Dai Zhou Hao Bo Li-Qing Fan Reproductive Medicine Center Hunan Provincial Maternal and Child Health Care HospitalChangsha 410000China NHC Key Laboratory of Birth Defect for Research and Prevention Hunan Provincial Maternal and Child Health Care HospitalChangsha 410000China Institute of Reproduction and Stem Cell Engineering School of Basic Medicine ScienceCentral South UniversityChangsha 410000China Reproductive and Genetic Hospital of CITIC-Xiangya Changsha 410000China

Continuous self-renewal and differentiation of spermatogonial stem cells(SSCs)is vital for maintenance of adult *** several spermatogonial stem cell regulators have been extensively investigated in rodents,regulatory mechanisms of human SSC self-renewal and differentiation have not been fully *** analyzed single-cell sequencing data from the human testis and found that forkhead box P4(FOXP4)expression gradually increased with development of *** analysis of its expression patterns in human testicular tissues revealed that FOXP4 specifically marks a subset of spermatogonia with stem cell *** inactivation of FOXP4 in human SSC lines suppressed SSC proliferation and significantly activated ***4 expressions were markedly suppressed in tissues with dysregulated *** findings imply that FOXP4 is involved in human SSC proliferation,which will help elucidate on the mechanisms controlling the fate decisions in human SSCs.

关键词： forkhead box P4 human proliferation spermatogonial stem cells testis

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Applying molecular genetic tools to tiger conservation

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Integrative Zoology 2010年第4期5卷 351-362页

作者： shu-Jin luo Warren E.JOHNSON Stephen J.O’BRIEN School of Life Sciences Peking UniversityBeijingChina Laboratory of Genomic Diversity National Cancer InstituteFrederickMDUSA

The utility of molecular genetic approaches in conservation of endangered taxa is now commonly *** the past decade,conservation genetic analyses based on mitochondrial DNA sequencing and microsatellite genotyping have provided powerful tools to resolve taxonomy uncertainty of tiger subspecies,to define conservation units,to reconstruct phylogeography and demographic history,to examine the genetic ancestry of extinct subspecies,to assess population genetic status non-invasively,and to verify genetic background of captive tigers *** genetic status of tiger subspecies and populations and implications for developing strategies for the survival of this charismatic species both in situ and ex situ are discussed.

关键词： conservation genetics mitochondrial DNA microsatellite subspecies tiger

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The development and application of a multiplex short tandem repeat(STR)system for identifying subspecies,individuals and sex in tigers

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Integrative Zoology 2015年第4期10卷 376-388页

作者： Zheng-Ting ZOU Olga V.UPHYRKINA Pavel FOMENKO shu-Jin luo College of Life Sciences Peking-Tsinghua Center for Life SciencesPeking UniversityBeijingChina Institute of Biology and Soil Sciences Far Eastern Branch Russian Academy of SciencesVladivostokRussia World Wide Fund for Nature–Russia Amur Branch VladivostokRussia Department of Computational Medicine and Bioinformatics University of MichiganAnn ArborMichiganUSA.

Poaching and trans-boundary trafficking of tigers and body parts are threatening the world’s last remaining wild *** of an efficient molecular genetic assay for tracing the origins of confiscated specimens will assist in law enforcement and wildlife forensics for this iconic flagship *** developed a multiplex genotyping system“tigrisPlex”to simultaneously assess 22 short tandem repeat(STR,or microsatellite)loci and a gender-identifying SRY gene,all amplified in 4 reactions using as little as 1 ng of template *** DNA samples used for between-run calibration,the system generates STR genotypes that are directly compatible with voucher tiger subspecies genetic profiles,hence making it possible to identify subspecies via bi-parentally inherited *** applied“tigrisPlex”to 12 confiscated specimens from Russia and identified 6 individuals(3 females and 3 males),each represented by duplicated samples and all designated as Amur tigers(Panthera tigris altaica)with high *** STR multiplex system can serve as an effective and versatile approach for genetic profiling of both wild and captive tigers as well as confiscated tiger products,fulfilling various conservation needs for identifying the origins of tiger samples.

关键词： Amur tiger genetic multiplex sexing short tandem repeat

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Morphological and ISSR molecular markers reveal genetic diversity of wild hawthorns (Crataegus songorica K. Koch.) in Xinjiang, China

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Journal of Integrative Agriculture 2017年第11期16卷 2482-2495页

作者： SHENG Fang CHEN shu-ying TIAN Jia LI Peng QIN Xue WANG Lei luo shu-ping LI Jiang College of Forestry and Horticulture Xinjiang Agricultural University Urumqi 830052 P.R. China Academy of Forestry in Ili Yining 835000 P.R. China Zhengzhou Fruit Research Institute Chinese Academy of Agricultural Sciences Zhengzhou 450009 P.R. China

The wild hawthorn species, Crataegus songorica K. Koch., is an important wild germplasm resource in Xinjiang, China that has been endangered in recent years. The genetic diversity of C. songorica K. Koch. germplasm in five populations from Daxigou, Xinjiang, China were evaluated based on phenotypic traits and ISSR molecular markers to provide basic infor- mation on resource protection, rational utilization and genetic improvement. The F-value for the phenotypic differentiation coefficient of the 33 traits measured ranged from 0.266 to 15.128, and mean value was 13.85%. The variation among populations was found to be lower than that within population. A total of 303 loci were detected within the five populations by 12 primers. Within 298,polymorphic loci, the polymorphism was 98.35%, showing a high genetic diversity in C. songorica K. Koch. The gene diversity within population, total population genetic diversity, genetic differentiation coefficient and gene flow were 0.2779, 0.3235, 0.1408, and 3.0511, respectively. Our results showed that C. songorica K. Koch. from Xinjiang has a high level of genetic diversity at both the phenotypic and molecular levels. Significant genetic differentiation existed within population and the differentiation trend showed a regional association. And in this study, in situ and ex situ conser- vation approaches were raised for wild hawthorn protection utilization.

关键词： phenotypic traits ISSR marker genetic diversity Crataegus songorica K. Koch. germplasm resources molecular marker

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Simple Method for Simultaneous Quantitation and Fingerprint Analysis of Ginkgo biloba Tablets by High Performance Liquid Chromatography-UV-Evaporative Light Scattering Detector

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Chemical Research in Chinese Universities 2009年第1期25卷 25-30页

作者： WANG shu-fang luo Xiao-ling SHAO Qing CHENG Yi-yu QU Hai-bin Department of Chinese Medicine Science and Engineering College of Pharmaceutical Sciences Zhejiang University Hangzhou 310058 P. R. China

By optimizing the separation and analytical conditions, a reliable, simple and accurate high-performance liquid chromatography（HPLC） method coupled with ultraviolet（UV） and evaporative light scattering detector（ELSD） was developed for the simultaneous determination of lactones and flavonoid, that is, bilobalide, ginkgolide A, ginkgolide B, and rutin, in more than 10 batches of Ginkgo biloba tablets from different pharmaceutical companies. The method could also be applied to fingerprint research, for a more general evaluation of the quality of this preparation. The separation of the components was achieved on a Hanbon C18 column with gradient elution using water and methanol containing 0.1% trifluoroacetic acid（TFA）. The column temperature was 30 ℃ and the flow-rate of the mobile phase was 0.6 mL/min. The drift tube temperature of the ELSD was set at 100 ℃, and the nitrogen flow-rate was 2 L/min. Good linear relationships were shown with correlation coefficients for analytes exceeding 0.9913. The limits of detection（LODs, S/N=3） and the limits of quantitation（LOQs, S/N=10） were 0.00887-0.0508 μg/μL and 0.0171- 0.0636 μg/μL, respectively, on the column. The relative standard deviations（RSD） of the analytes were less than 3.61% for intraday and 3.70% for interday, respectively. The average recovery rates obtained were in the range of （97.3±4.3）% to （101.9±3.1）% for all the compounds. The results of quantitative and fingerprint analysis proved that the contents of the components were totally similar in the preparation of Ginkgo biloba tablets from the same pharmaceutical company; whereas, they varied significantly in the preparations of Ginkgo biloba tablets from different companies.

关键词： Ginkgo biloba Terpene lactone Flavonoid Fingerprint HPLC-UV-ELSD

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