Advanced Materials Research Vols. 183-185

Abstract: Laoying Tea, leaves of Litsea coreana L., is conventionally consumed as healthy tea beverage in southern China for hundreds of years. The ethanolic, cold water and hot water extracts were prepared and their antioxidant properties studied. At 160 µg/mL, the cold water extract showed a high reducing power of 1.056. With regard to the scavenging ability on 1,1-diphenyl-2-picrylhydrazyl radicals, extracts were effective in the order: ethanolic > cold water > hot water extracts. EC₅₀ values for chelating ability on ferrous ions for ethanolic, cold water and hot water extracts were 10.23, 0.85 and 1.12 mg/mL, respectively. Total phenols were the major naturally occurring antioxidant components found and were in the order: cold water > hot water > ethanolic extracts. Based on EC₅₀ values, the various extracts from laoying tea were effective antioxidants.

Abstract: Docosahexaenoic acid (DHA. C22:6 ω-3) is an important structural component of neural and retinal tissues .The DHA yield was highest at pH5.5. Glucose and maltose utilization were similar as a function of pH, linseed oil consumption increased at pH 5.5, indicating that the formation of DHA from linseed oil at pH5.5 was of increased importance. Increased aeration resulted in doubling of T. aureum cell dry weights, increasing DHA yields and increasing in the maximum DHA -specific production rate .

Abstract: Understanding of the interactions between climatic and hydrological factors is very important for both real situation analyses and predicting the climatic trends and potential hydrological consequences. Air temperature, precipitation, evaporation, discharge, sandiness and sediment transport for the period 1968-2009 were selected to discover the change trends and correlations of climatic and hydrological factors in the Liu River within the boundaries of Zhangwu county. The intra-year variation scope of air temperature and sandiness were largest and smallest respectively. Monthly change trend of every factor was very similarly except evaporation. The variation scope of inter annual sediment transport and evaporation were largest and smallest respectively. The trend of air temperature series for the period 1968-2009 was positive (p<0.01), and the trends of evaporation, discharge, sandiness and sediment transport series for the period 1968-2009 were negative (p<0.01).There were significant correlations among climatic and hydrological factors.

Abstract: Soil water infiltration is an important link of the natural water cycle. Infiltration is the inherent properties of soils. It determines the speed and distribution of the irrigation water converted to soil water. Then affected the irrigation’s quality and effect. Especially for high saline soil infiltration of improvement has profound significance. Gypsum improving is a chemical measures to improve high saline soils and has a remarkable effect on soil water infiltration. It can improve saline land with the help of other measures.

Abstract: The expression and functional analysis of plant metallothionein type 2 from Brassica juncea were achieved in E. coli. The BjMT-2 cDNA was cloned into the pETM-20 vector fused to the Thioredoxin gene and induced to E. coli. Northern blot and SDS PAGE analysis showed, respectively, that the transcription of the TrxA::BjMT-2 fusion gene and the expression of the fusion protein were predominately in E. coli cells after IPTG induction. The BjMT-2 in the crude extraction prepared from the E. coli cells bearing TrxA::BjMT-2 vector were reacted with the antibody directed against BjMT-2. The E. coli cells exhibited an increased tolerance against Cu²⁺ and Cd²⁺ after BjMT-2 expression.

Abstract: The environmental conservation values of wetland plants were estimated in successive terms, by using the calculation model of ecosystem service values. The removal experiments of CODcr and TN in wastewater were carried out. Cattail, reed, small sedge and potamogeton were chosen as experimental wetland plants, while vertical flow wetland was constructed by using flyash concrete as filling material. The results show that the environmental protection function of wetland is remarkable. Of the whole ecosystem service values of the wetland plants, the most is the pollutant purification value accounting for 28.95%, while the least is the raw food production value accounting for 0.11%-0.48%. Cattail has the greatest purification capacity of CODcr in wastewater with the removal rate of 42.64%, potamogeton has the greatest purification capacity of TN with the removal rate of 62.83%, while reed has pretty good purification capacity of both CODcr and TN. The pollutant removal rates of the submerged plants increase with temperature rises.

Abstract: In this paper, The benzene-ethanol extraction contents of the leaves, sprig and bark of eight different species on the Maoer Mountain region, the similarities and differences about the extraction contents of the different parts of the same species and the different tree species were studied, and attempted to analyze the reasons for the differences, in order to provide a reference for the fire tree species selection and forest fire prevention. The results showed that the extraction contents of leaves, sprig and bark parts of the same species did not differ greatly, the extraction contents of the different species showed significant difference, Korean Pine had the highest extraction content, Mandchur Ash and Manchurian Walnut Maxim had the lower extraction content, the variation range of the extraction contents was 8.01%~20.69%, and the extraction contents of the conifer species were significantly higher than the broad-leaved tree species. As far as benzene-ethanol extraction is concerned, Korean Pine was most burnt. Mandchur Ash and Manchurian Walnut Maxim was relative fire-retardant. And the conifers was more relatively easy to burn than the broad-leaved trees. The fire-retardant tree species could be considered as the fire protection tree species, such as, Mandchur Ash and Manchurian Walnut Maxim.

Abstract: In order to assess the risk of heavy metal elements, including mercury, cadmium, lead, chromium, copper and zinc in soil, the soil was tested by Nemerow and Hakanson methods to assess the pollution and potentially ecological risk. The results indicated that among six kinds of heavy mental elements, cadmium had the highest accumulation, lead and chromium had the lowest accumulation in urban topsoil by comparison to the background concentration of the second grade standard values of the Chinese environmental quality standards for soil. The pollution degree of heavy metals used by Nemerow methods was showed medium pollution in one-third sample sites and the others were slight. The potentially ecological risk was slight. The degree of heavy metal pollution and the potentially ecological risk were slight using the two methods.

Abstract: Dioxin is the unintentional synthesized extreme toxic Persistent Organic Pollutants (POPs) in the sintering process. The process of dioxin’s formation and decomposition in the sintering bed layer, as well as the reaction mechanism and related theoretical model of different temperature sector were expounded in this paper. The correlated research indicated that: in the low temperature sector (200-500°C), chlorobenzene and chlorphenol are the representation precursors of dioxin’s precursors catalytic reaction, the dioxin formed in this temperature sector cased by the “de novo” under catalyst (like Cu²⁺) on the surface of smoke particles, its catalytic mechanism of the same phases and heterogeneous all satisfied the four-step reaction model; high-temperature gas phase reaction mechanism of dioxin satisfied the first-order kinetic model, the formation of gas related with suitable precursors, it is the result of chlorinated precursors’ pyrolytic rearrangement like chlorobenzene and chlorophenol in the temperature sector 500-800°C in the gas.

Abstract: This paper proposes an evolutionary self-organized clustering method of genes based on undirected graph expression. In this method, we use the vertices of the graph to represent genes, and regard the weight between two vertices as similarity measurement of two genes. Thus, the similarities among genes can be extracted according to the space feature of graph with immune evolutionary method. To demonstrate the effectiveness of the proposed method, the method is tested on yeast cell cycle expression dataset; the results suggest that this method is capable of clustering genes.