供热,空调工程水系统管道内经济流速的研究

从流速对系统的初投资费用及运行费用的影响出发，研究了供暖，空调工程中水系统管道内的经济流速，在初投资费用及运行费用最低的条件下导出了经济流速的相关表达式，分析，讨论了流量大小，系统设计寿命长短等对经济流速的影响。     

金刚石薄膜热敏器件特性

本文采用热丝ＣＶＤ方法和在以石英为衬底的金属钛梳状微电极上制备出的均匀致密、结晶完整的金刚石薄膜，制成了金刚石薄膜热敏器件．对其热敏特性的测试结果表明，该热敏元件具有检测温度范围宽、响应快、灵敏度高、性能稳定等优点．     

Refolding with Simultaneous Purification of Recombinant Human Granulocyte Colony-stimulating Factor from Escherichia coli Using Strong Anion Exchange Chromatography

Human granulocyte colony-stimulating factor (hG-CSF), a single chain polypeptidecontaining 174 amino acid residues (MW=18,800, pI=6.1), is one of the hemopoieticgrowth factors which plays an important role in stimulating proliferation, differentiation,and functional activation of bloodcells1. It contains a free cysteine at position 17 andtwo intramolecular disulfide bonds, Cys36-Cys42 and Cys64-Cys74, and the two disulfidebonds in G-CSF molecule are both required for its bioactivity2. Wh…     

Na~+/Ca~(2+) Exchange-mediated La~(3+) Entry in Human Lymphocytes

With extensive applications the rare earth elements to agriculture, medicine and animal husbandry, whether rare earth ions can cross cell membranes and participate in the metabolism of animals and plants is not clear until now. Otherwise, rare earth ions have different interaction fashions to different kinds of cells, therefore, in this study we determined whether La3+ enter human peripheral blood lymphocytes via Na+/Ca2+ exchanger (measured with fura-2).Relative sensitivity of fura-2 to Ca2+…     

Spectroscopic Study of the Interaction of Bu_2SnCl_2 with EHPG

A number of Sn (Ⅳ)complexes have been synthesized since 1980 and tested its anticancer activity1. The simplest complex Bu2SnCl2 has activity to P388 tumor cells. Several metal complexes such as Ru-ind (trans-indazolium (bisindazole) tetrachloro- ruthenate (Ⅲ)) had used transferrin as a drug delivery system, the complexes still exhibit high antitumor activity and lower toxicity2. We use EHPG as a model ligand3 to study the interaction between Bu2SnCl2 and EHPG. EHPGAt first, we stud…     

建立技术创新机制增强企业竞争实力

文章结合实际，阐述了如何建立技术创新机制，增强企业自身的竞争力。     

Cleavage of DNA by a New Mixed-ligand Cu（ Ⅱ ） Complex

Cleavage of DNA pUC19 by [Cu(saldien)(NH3)]C12 (here, saldien=bis(salicylicdene)-diethylenetriamine) was investigated at different pHs, times, concentrations, and 37℃. It wasfound that the copper( Ⅱ ) complex could cleave DNA without added coreactants.     

勇于创新 转变机制 尽快把科技成果推向市场

文章从实际出发，在加强技术创新，开发新产品和转变机制及股份制改造等方面进行了论述。     

Synthesis and DNA Cleavage Studies of 2,6-Dimethoxyhydroquinone-3-Mercaptoacetic Acid Conjugates

In previous paper and work, we reported the synthesis and cytotoxicity studies of a novel series of short chain peptide conjugates of the cytotoxic agent 2, 6-dimethoxyhydro -quinone-3-mercaptoacetic acid1 (DMQ-MA). The DMQ-MA is a derivative of 2,6-dimethoxybenzoquinone, which is a natural product of fermented wheat germ and found to have a wide spectrum of cytotoxicity against various tumor cell lines under the synergistic activation of L-ascorbic acid (AH2)2,3. Compared with DMQ, DMQ…     

Direct conversion of glucose and cellulose to 5-hydroxymethylfurfural in ionic liquid under microwave irradiation

An efficient strategy for CrCl₃-mediated production of 5-hydroxymethylfurfural (HMF) in ca. 60% and 90% isolated yields from cellulose and glucose, respectively, in ionic liquid under microwave irradiation is presented.