水合肼处理CaCO3中高温净化焚烧烟气的研究

用水合肼对CaCO3进行处理,并将处理后的CaCO3用于中高温段净化焚烧烟气中的Hcl和NO。研究结果显示,因肼在加热过程中会分解甚至燃烧产生大量气体,使处理后的CaCO3在煅烧后比普通CaCO3的颗粒更细,反应活性更高,最终水合肼处理CaCO3吸收HCl气体的反应率随温度的升高而增大。当肼处理CaCO3中的肼含量在肼钙摩尔比为0．1-0．3的范围内变化到0．15时,其吸收HCl气体的反应率为最大。但当肼钙摩尔比大于0．15后,CaCO3在受热后板结而导致反应率降低。肼处理CaCO3在450-650℃范围内、烟气中氧量高于13％的条件下显示了对NO的还原效率,这是由于肼在此条件下对NO具有还原能力;而常用的还原剂氨在问样条件下对NO不具备还原能力。使用肼处理CaCO3可望实现在中高温段同时净化焚烧烟气中的酸性气体和NO。     

Theoretical Study of the Isomerization Reaction of 1-3 H Transfer on Formamidine Substituted by Halogen

The ab initio method has been used to study the 1-3 H transfer reaction on formamidine substituted by halogen. The calculation results show that the substituted halogen has two effects on the 1-3 H transfer reaction: decreasing the activation energy and stabilizing the C=N double bond owing to the conjugative effect of p-π-p of products and transition states.     

Large-scale purification of human granulocyte-macrophage colony-stimulating factor expressed in Bombyx mori pupae

Human granulocyte-macrophage colony-stimulating factor (hGM-CSF) acts on many different kinds of cells, including monocytes, macrophages, granulocytes, eosinophils, and multipotential stem cells. To explore further explore pharmaceutical action, we expressed hGM-CSF by the Bombyx mori nucleopolyhedrovirus expression system in silkworm pupae. However, purifying recombinant proteins from silkworm pupae on a large scale has been a big challenge. To establish purification methods suitable for mass production, we tried two crude preparation methods: (NH4)2SO4 fractional precipitation and isoelectric precipitation with a combination of gel filtration and ion-exchange chromatography. The isoelectric precipitation method was found to be more efficient. With this method, we eventually obtained approx 11.7 mg of 95% pure product from 1000 g of infected silkworm pupae. The recovery of purified protein was greatly increased, by approx 40%, compared with the other method. The biologic activity of this protein was determined up to 9.0 x 106 colony-forming units/mg in the final purified product.     

Analysis of similarity/dissimilarity of DNA sequences based on a class of 2D graphical representation

On the basis of a class of 2D graphical representations of DNA sequences, sensitivity analysis has been performed, showing the high-capability of the proposed representations to take into account small modifications of the DNA sequences. And sensitivity analysis also indicates that the absolute differences of the leading eigenvalues of the L/L matrices associated with DNA increase with the increase of the number of the base mutations. Besides, we conclude that the similarity analysis method based on the correlation angles can better eliminate the effects of the lengths of DNA sequences if compared with the method using the Euclidean distances. As application, the examination of similarities/dissimilarities among the coding sequences of the first exon of beta-globin gene of different species has been performed by our method, and the reasonable results verify the validity of our method.     

Large-scale purification of human granulocyte-macrophage colony-stimulating factor expressed in <Emphasis Type="Italic">Bombyx mori</Emphasis> pupae

Human granulocyte-macrophage colony-stimulating factor (hGM-CSF) acts on many different kinds of cells, including monocytes, macrophages, granulocytes, eosinophils, and multipotential stem cells. To explore further explore pharmaceutical action, we expressed hGM-CSF by the Bombyx mori nucleopolyhedrovirus expression system in silkworm pupae. However, purifying recombinant proteins from silkworm pupae on a large scale has been a big challenge. To establish purification methods suitable for mass production, we tried two crude preparation methods: (NH₄)₂SO₄ fractional precipitation and isoelectric precipitation with a combination of gel filtration andion-exchange chromatography. The isoelectric precipitation method was found to be more efficient. With this method, we eventually obtained approx 11.7 mg of 95% pure product from 1000 g of infected silkworm pupae. The recovery of purified protein was greatly increased, by approx 40%, compared with the other method. The biologic activity of this protein was determined up to 9.0×10⁶ colony-forming units/mg in the final purified product.     

Exclusive Processes of Hard Diffractive J/φ + γ Production in P+P(P) Collisions and the Pomeron Model of Donnachie-Landshoff

By using. double porneron exchange mechanism, we have studied the exclusive processes P+P(P)→ P+P(P)+J/φ + γ at high-energy and have shown that these processes can be effectively used to test the porneron structure model proposed by Donnachie and Landshoff.     

Relationship between the Biodegradability and Structure of Polycyclic Aromatic Hydrocarbons

21 Physicochemical and quantum chemical parameters of 17 kinds of polycyclic aromatic hydrocarbons were calculated by using semi-empirical MOPAC AM1 method. By means of Partial Least Squares （PLS）, quantitative structure-biodegradation relationship （QSBR） study was performed with the logarithm of specific biodegradation rates （logKb）. The optimal model was obtained, and the result showed that the first-order molecular connectivity index （^1X）, the energy of the lowest unoccupied molecular orbital （Elumo）, logarithm of n-octyl alcohol/water partition coefficient （logP） and torsion energy （Et） are the dominant factors governing the biodegradability of polyeyelie aromatic hydrocarbons, and the effect of second-order valence molecular connectivity index （^2X^V）, the third-order valence molecular connectivity index （^3X^V） and molar refractivity （Rm） should not be ignored.