胜利油区单家寺油田超稠油性质研究

综合运用室内实验、物理、化学分析及数值拟合方法 ,对稠油的物理及化学性质进行了分析。分析结果表明 ,稠油的物理性质与化学性质存在一定的相关性。

Effect of Lattice Distortion on Charge Order in Manganites at Doping x=0.5

In the present paper, we continue our investigation on the antiferromagneticorigin of the charge order observed in the halt-doped manganese. By introducing aSu-Schrieffer-Heeger (SSH) type of perturbation interaction to the double-exchange Hamiltonian, wecalculate again its ground-state phase diagram at Glling x = 0.5 by the unrestricted real-spaceHartree-Fock approximation method. We find that, as the SSH electron-phonon interaction increases,the charge order parameter decreases to zero rapidly but the CE-type antiferromagnetic order becomesmore stable. In other words, the charge order is much more fragile than the CE-type or theNeel-type antiferromagnetic orders under the electron-phonon perturbation. These results support theproposed theory in the recent publications that the charge order in these systems is induced by theantiferromagnetic correlations.

Correlation of the Cytotoxic and Antioxidant Activities of Moroccan Pomegranate （Punica Granatum） with Phenolic and Flavonoid Contents

The Pomegranate （Punica Granatum）, which belongs tothe Lythraceae family, has been used for centuries in traditional Greco-Arab and Islamic medicine of its vermifuge properties and also to treat various diseases. The aim of this research was to investigate the cytotoxicity and antioxidant activities of Moroccan Pomegranate （peel, leaves, branches, flowers and corolla）. Further, the biological activities were correlated with phytochemical contents of the plant extracts. Methanolic extract from different parts of Punica Granatum was assessed for its antiproliferative activity in two human cancer （breast and colon） cells lines （MBA-MD 231 and HT-29）, through MTT （3-（4,5-dimethyl-2- thiazolyl）-2,5-diphenyl-2H-tetrazolium bromide） bioassay using cell viability and cytotoxicity indices. DPPH （2,2-diphenyl-l-picrylhydrazyl） assay was conducted to screen the antioxidant property of the extracts together with its phenolic and flavonoids content were evaluated, as well. The methanolic extract ofPunica Granatum （peel, leaves, branches, flowers and corolla） showed the highest antiproliferative activity on MBA-MD 231 （IC50 was 133.53-233.32 μg/mL） and HT-29 （IC50 was 127.58-203.24 μg/mL） cells. Antioxidants contents are distributed as follows： peel 〉 leaf 〉 flower 〉 corolla 〉 branches. The inhibitory activities required for decreasing initial DPPH by 50% are 8.27, 9.9, 10.06, 11.67 and 13.28 μg/mL, respectively. These results are in correlation with polyphenols content from corolla, peel, leaves, flower and branches are 120.7, 115, 96.65, 90.73 and 64.67 mg GAE/g dw （mg gallic acid equivalents per g dry weight） and flavonoids are 188.8, 221.7, 180.2, 193.7 and 158.5 mg QE/g dw （mg quercetin equivalents per g dry weight）. Our results show that the peel, flowers, corolla, leaves and branches of Moroccan Pomegranate may contain a lot of bioactive compounds which are responsible for strong antioxidant and cytotoxicity activities observed here. Our finding indicates the possibility of using the extracts of this plant as source of natural antioxidant and anticancer mainly for its abundant phenolic and flavonoid contents.

Benchmarking the Polyatomic Reaction Dynamics of X+Methane

With recent developments of sophisticated experimental techniques and advanced theoretical methods/computations, the field of chemical dynamics has reached the point that theoryexperiment comparisons can be made at a quantitative level in very fine details for a prototypical A+BC system. As the system becomes larger, more degrees of freedom are involved and the complexity increases exponentially. At the same time, the multifaceted nature of polyatomic systems also opens up the possibilities for observing many new chemistry and novel phenomena|a land of opportunities. For the past 15 years or so my laboratory has delved into the reaction dynamics of methane+X (X: F, Cl, O(3P), and OH). This effort shifts the paradigm in the field of reaction dynamics by making the title reaction a benchmark polyatomic system. In this account, I shall disclose my thinking behind some of the key concepts and methods we introduced and how the unexpectedly discovered phenomena led to other uncharted territories. Those ndings not only enrich our understanding of the specific reactions we studied at the most fundamental level and inspire the theoretical developments, but also shape our thinking and lay the foundation for future explorations of different aspects of the multifaceted nature of polyatomic reactivity.

Studies on the Relationship between Multidrug Resistance 1 Gene and Pancreatic Cancer

Objective: To study the relationship between the expressions of multidrug-resistance, 1 (mdr1) gene-coded mRNA and its product P-glycoprotein (P-gp) and biological characteristics of tumor cells in patients with previously untreated primary pancreatic cancer (PC) for guiding signi?cance to the clinical treatment. Methods: Expression of mdr1 mRNA and P-gp on para?n embedded sections was detected by in situ polymerase chain reaction (ISPCR) and immunohistochemistry correspondingly from 150 cases of normal and abnormal pancreatic tissues including 97, 32 and 21 cases of pancreatic cancer, pancreatitis and normal pancreatic tissues respectively. Results: Distributions of positive staining in mdr1 mRNA and P-gp were mainly found on the apical plasma membranes and in cytoplasms of endothelial duct cells in tumor and normal tissues. The positive staining rates of expression of the mdr1 mRNA and P-gp detected in all pancreatic tumors were signi?cantly higher than that in pancreatitis and normal tissues correspondingly (P <0.05). Moreover, higher expressions of mdr1 mRNA and P-gp in tumor cells were correlated with some biological characteristics of PC, such as the degree of di?erentiation, aggressiveness and TNM stage of tumors (P <0.05). However, there was no correlation between the rate of expression of mdr1 mRNA and P-gp and some clinical ?ndings including age, sex, location and tumor size. Conclusion: The expression of mdr1 gene was associated with “natural” multi-drug resistance in PC. There was an important guiding signi?cance between the detection of expression of mdr1 gene and prediction of the sensitivity to chemotherapy of PC. Meanwhile, it probably could be used as one of profoundly parameters to assess the degrees of di?erentiation and prognosis in PC.

Study of the approximate approaches to the POD based spectral representation method

The spectral representation method (SRM) is most widely used in simulating the stochastic field.The proper orthogonal decomposition (POD) based SRM is an important form.This paper investigates the approximate approaches to the POD-based SRM in simulating two typical problems,i.e.,the seismic ground motion and wind velocity fields simulations.Then,the accuracy resulting from the power spectral density matrix-based POD method (PSRM) is compared to that of the coherency matrix-based POD method (CPSRM).It is concluded that the CPSRM maintains a much higher accuracy than the PSRM.In the CPSRM,the linear interpolation of eigenvectors and third-order polynomial interpolation of eigenvalues can be accepted to attain high accuracy;the linearly distributed interpolation nodes are effective in the ground motions simulation;however,the exponentially distributed interpolation nodes are effective in the wind velocity simulation.

Correlation between Chemical Structure and Biological Activity of Host-Selective Plant Pathogen Mycotoxins

Toxin, one of the most important factors of plant fungal disease, has attracted much attention of many academicians who have been studying pathogen mycotoxin in deep research. The paper summarized chemical structures of some host-selective plant pathogen mycotoxins discovered in recent years and the correlation between biological activity and chemical structure of toxin.