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Search Results: 1 - 10 of 135121 matches for " ZHANG Song-ping "
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Coupled Enzymatic Reactions for Simultaneous Synthesis of 1, 3-Dihydroxyacetone and 2-Aminobutyric Acid with in situ Regeneration of Coenzyme
包括辅酶原位再生的偶联酶反应联产1,3-二羟基丙酮和2-氨基丁酸

MIAO Wei-juan,WANG Ping,ZHANG Song-ping,
苗维娟
,王平,张松平

过程工程学报 , 2008,
Abstract: 将甘油脱氢酶(GDH)和亮氨酸脱氢酶(LDH)偶联,以甘油和2-丁酮酸为底物,同时合成1,3-二羟基丙酮(DHA)和2-氨基丁酸,并实现辅酶NAD 的循环再生.考察了底物和辅酶NAD 浓度对产物产率和辅酶总转换数(TTN)的影响,结果表明,当NAD 初始浓度为0.1 μmol/L时,TTN值可达5110;底物甘油和2-丁酮酸的转化率分别为1.4%和2.6%.通过分析各反应底物和产物对GDH和LDH反应初速率的影响,认为产物DHA和2-氨基丁酸对GDH和LDH的强烈抑制效应是造成反应转化率低的主要原因.因此,采取有效的产物去除措施将是提高偶联反应效率的关键.
PURIFICATION AND IDENTIFICATION OF -AMANITIN AND PHALLOIDIN FROM AMANITA FULIGINEA
a-鹅膏毒肽和二羟鬼笔毒肽的制备和鉴定

ZHANG Xiao-Yuan,LIANG Song-Ping,ZHANG Zhi-Guang,
张晓元
,梁宋平,张志光

菌物学报 , 2002,
Abstract: -鹅膏毒(环)肽和二羟鬼笔毒(环)肽是剧毒的鹅膏菌和其它几种致死毒菌中由一些修饰氨基酸组成的环肽毒素。由于-鹅膏毒肽对真核生物的mRNA合成的专一性抑制和和二羟鬼笔毒肽对肌动蛋白的专一性束缚,因而它们在分子生物学和细胞学研究中具有重要应用,对其需求逐步增加。为此,作者使用了一种改良的毒素提取方法,以制备高效液相色谱从灰花纹鹅膏菌中分离制备-鹅膏毒肽和二羟鬼笔毒肽,并通过紫外吸收光谱和质谱进行鉴定,表明-鹅膏毒肽和二羟鬼笔毒肽的分离效果好,纯度高。本方法对其它毒菌中的-鹅膏毒肽和二羟鬼笔毒肽的分离制备具有同样的应用价值。
Activation of Sepharose with Epichlorohydrin in Water-free System for Preparation of High Capacity Immobilized Metal Ion Affinity Adsorbent
无水体系中环氧氯丙烷活化琼脂糖凝胶制备高载量固定化金属亲和层析介质

ZHANG Song-ping,DING Rui,SU Zhi-guo,WANG Ping,
张松平
,丁锐,苏志国,王平

过程工程学报 , 2010,
Abstract: 在以二甲基亚砜为溶剂的无水体系中,利用环氧氯丙烷对琼脂糖凝胶Sepharose 6 Fast Flow进行活化,并偶联亚氨基二乙酸和Cu2+制备了固定化金属亲和层析介质. 结果表明,该体系中环氧氯丙烷对琼脂糖凝胶的活化效率大幅度提高,在40%(j)环氧氯丙烷、0.02 g/mL NaOH及50℃、反应时间4 h的优化条件下,环氧基活化密度最高达165 mmol/mL,较目前报道的最高值提高50%以上. 最终所制介质的Cu2+螯合密度为128.3 mmol/mL,对BSA的平衡吸附容量达2.05 mmol/L. 以0.5 mol/L咪唑为洗脱剂,被吸附的BSA洗脱率可达90%以上.
Dynamic changes of Ruoergai Plateau wetland ecosystem service value.
若尔盖高原湿地生态系统服务价值动态

ZHANG Xiao-yun,LV Xian-guo,SHEN Song-ping,
张晓云
,吕宪国,沈松平

应用生态学报 , 2009,
Abstract: 基于1975、2006年若尔盖高原湿地的卫星遥感资料,应用生态系统服务价值评价方法,对1975—2006年间若尔盖高原湿地生态系统的物质产品生产价值、气体调节价值和蓄水价值动态进行了研究.结果表明:研究期间,若尔盖高原湿地生态系统三项服务价值总和由195.90亿元降至123.85亿元,其中,物质产品价值增加了3.02亿元,而气体调节和蓄水价值共减少了75.07亿元.研究区由物质产品增加带来的收益远小于由生态退化造成的损失;过度的放牧行为致使若尔盖高原湿地生物量减少、土壤结构变化,造成生态系统总服务价值和服务水平下降.
Research on Open-Source Hardware Based Design Method
基于开放源代码的硬件设计方法研究

Mai Song-ping,Zhang Chun,Yang Kun,Wang Zhi-hua,
麦宋平
,张 春,杨 昆,王志华

电子与信息学报 , 2007,
Abstract: 可重用性是当今超大规模集成电路设计的必要元素.与传统的封闭源代码付费IP相比,开源硬件以共享设计文档和IP模块的方式为硬件设计的重用提供了更加彻底有效的解决办法.基于开源硬件的SoC设计方法以其开放性和灵活性正被越来越多的设计者所接受并付诸实用.该文对开源硬件的相关概念、意义、面临的问题及发展前景进行了较为详细的介绍,并以开源处理器的设计作为实例,对基于开源硬件的设计流程进行了深入的探讨.
An exact and explicit formula for pricing lookback options with regime switching
Leunglung Chan,Song-Ping Zhu
Quantitative Finance , 2014,
Abstract: This paper investigates the pricing of European-style lookback options when the price dynamics of the underlying risky asset are assumed to follow a Markov-modulated Geo-metric Brownian motion; that is, the appreciation rate and the volatility of the underlying risky asset depend on unobservable states of the economy described by a continuous-time hidden Markov chain process. We derive an exact, explicit and closed-form solution for European-style lookback options in a two-state regime switching model.
An exact and explicit formula for pricing Asian options with regime switching
Leunglung Chan,Song-Ping Zhu
Quantitative Finance , 2014,
Abstract: This paper studies the pricing of European-style Asian options when the price dynamics of the underlying risky asset are assumed to follow a Markov- modulated geometric Brownian motion; that is, the appreciation rate and the volatility of the underlying risky asset depend on unobservable states of the economy described by a continuous-time hidden Markov process. We derive the exact, explicit and closed-form solutions for European-style Asian options in a two-state regime switching model.
Mothers of Autistic Children: Lower Plasma Levels of Oxytocin and Arg-Vasopressin and a Higher Level of Testosterone
Xin-Jie Xu, Xiao-Jing Shou, Jin Li, Mei-Xiang Jia, Ji-Shui Zhang, Yan Guo, Qing-Yun Wei, Xiu-Ting Zhang, Song-Ping Han, Rong Zhang, Ji-Sheng Han
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0074849
Abstract: Background Autism is a pervasive neurodevelopmental disorder,thought to be caused by a combination of genetic heritability and environmental risk factors. Some autistic-like traits have been reported in mothers of autistic children. We hypothesized that dysregulation of oxytocin (OXT), Arg-vasopressin (AVP) and sex hormones, found in autistic children, may also exist in their mothers. Methods We determined plasma levels of OXT (40 in autism vs. 26 in control group), AVP (40 vs. 17) and sex hormones (61 vs. 47) in mothers of autistic and normal children by enzyme immunoassay and radioimmunoassay, respectively and investigated their relationships with the children’s autistic behavior scores (Childhood Autism Rating Scale (CARS) and Autism Behavior Checklist (ABC)). Results Significantly lower plasma concentrations of OXT (p<0.001) and AVP (p<0.001), as well as a higher level of plasma testosterone (p<0.05), were found in mothers of autistic children vs. those of control. The children’s autistic behavior scores were negatively associated with maternal plasma levels of OXT and AVP. Conclusions These results suggest that dysregulation of OXT, AVP and/or testosterone systems exist in mothers of autistic children, which may impact children’s susceptibility to autism.
Preparation of Highly Uniform Single and Double Emulsions with Microfluidic Chips Modified by Region-selective UV Irradiation
选择性紫外曝光法修饰微流控芯片用于制备高度均一的单乳液和复乳液

DING Rui,GAOFei,SU Zhi-guo,WANG Ping,MA Guang-hui,ZHANG Song-ping,
丁锐
,高飞,苏志国,王平,马光辉,张松平

过程工程学报 , 2011,
Abstract: 利用选择性紫外曝光法对聚二甲基硅氧烷(PDMS)微流控芯片通道内壁进行了部分亲/疏水改性,通过接触角和原子力显微镜对改性表面进行表征,并利用改性后的芯片制备出了高度均一的单乳液和复乳液. 结果表明,在芯片的非曝光区域,光引发剂二苯甲酮使PDMS表面粗糙且保持疏水性,接触角为101o;而在曝光区域,由于聚合形成的聚丙烯酸交联到PDMS上使其表面光滑且具有亲水性,接触角为62o,形成的亲/疏水特性可维持30 d以上. 利用改性后芯片制备的大豆油、三羟甲基丙烷丙烯酸酯和氟碳油3种单乳液的粒径变异系数均低于3%,而复乳液外径和内径的变异系数分别为3.5%和2.9%.
Ultimate Generalization to Monotonicity for Uniform Convergence of Trigonometric Series
Song-Ping Zhou,Ping Zhou,Dan-Sheng Yu
Mathematics , 2006,
Abstract: Chaundy and Jolliffe [4] proved that if $\{a_{n}\}$ is a non-increasing (monotonic) real sequence with $\lim\limits_{n\to \infty}a_{n}=0$, then a necessary and sufficient condition for the uniform convergence of the series $\sum_{n=1}^{\infty}a_{n}\sin nx$ is $ \lim\limits_{n\to \infty}na_{n}=0$. We generalize (or weaken) the monotonic condition on the coefficient sequence $\{a_{n}\}$ in this classical result to the so-called mean value bounded variation condition and prove that the generalized condition cannot be weakened further. We also establish an analogue to the generalized Chaundy and Jolliffe theorem in the complex space.
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