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渍害土壤肥力综合评价研究 总被引：12，自引：0，他引：12
利用因子分析、相关分析和模糊数学原理，针对渍害土壤的10项肥力指标进行了土壤肥力的综合评价。根据S型或抛物线型作物效应曲线建立各项肥力指标的隶属度函数，计算出隶属度值，并按各肥力指标的公因子方差、相关系数确定其权重系数，从而求得各渍害类型土壤肥力综合指标值（IFI),检验两种方法的IFI与其对应的水稻产量间的相关性，表明均达极显著水平（r=0.7521),说明综合评价结果能较好地反映出土壤的肥力。 相似文献
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Robert Strom Shirley Strom Pat Collinsworth Saburo Sato Katsuko Makino Yasuyuki Sasaki 《Educational gerontology》2013,39(8):781-794
The purpose of this study was to determine how three generations view the contribution and needs of grandparents in Japan. A sample consisting of 239 grandparents, 266 parents, and 274 grandchildren from, urban and rural areas completed the Grandparent Strengths and Needs Inventory (Strom & Strom, 1993). Grandparents reported more satisfaction, success, and involvement in teaching than was observed by parents or grandchildren. Grandparents experienced greater difficulty as well as frustration and saw themselves as less informed about their role than was reported by younger people. Significant main effects were generation, grandchild gender, grandchild age, generations living together, frequency of grandchild care by the grandparent, and amount of time the generations spent together. Implications for building curricula and guidelines for program development are identified. 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＦｉｂｒｏｂｌａｓｔｇｒｏｗｔｈｆａｃｔｏｒ (ＦＧＦ)ｉｓａｎａｎｇｉｏ ｇｅｎｉｃａｎｄｍｉｔｏｇｅｎｉｃｐｏｌｙｐｅｐｔｉｄｅｔｈａｔｃａｎｐｒｏｍｏｔｅｃｅｌｌｐｒｏｌｉｆｅｒａｔｉｏｎａｎｄｄｉｆｆｅｒｅｎｔｉａｔｉｏｎｉｎａｗｉｄｅｖａ ｒｉｅｔｙｏｆｃｅｌｌｔｙｐｅｓ (Ｇｏｌｄｆａｒｂ ,1 990 ;Ｂａｓｉｌｉｃｏｅｔａｌ.,1 992 ) .ＴｈｅＦＧＦｆａｍｉｌｙｈａｓｍａｎｙｍｅｍｂｅｒｓｗｉｔｈｓｉｍｉｌａｒａｍｉｎｏａｃｉｄｓｅｑｕｅｎｃｅａｎｄｂｉｏｌｏｇｉｃａｌａ… 相似文献
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Bioconversions of lipophilic compounds are currently attracting much interest in both the academic and the industrial world. To carry out these conversions effectively, it is essential to introduce water-miscible organic solvents into the reaction Systems or to use water-containing organic solvents as reaction solvents in order to improve the poor solubility of substrates in aqueous solutions. However, biocatalysts are in general liable to lose their activity in the presence of organic solvents. It is expected that enzyme immobilization will be the most general and promising means of reconciling these opposing demands. 相似文献
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Human acidic and basic fibroblast growth factors (aFGF and bFGF) are classic and well characterized members of the heparin-binding
growth factor family. Heparin is generally thought to play an extremely important role in regulating aFGF and bFGF bioactivities
through its strong binding with them. In order to unravel the mechanism of the interactions between heparin and FGFs, and
evaluate the importance of heparin sulfate groups' binding with FGFs, surface plasmon resonance analyses were performed using
IAsys Cuvettes System. Heparin and its regioselectively desulfated derivatives were immobilized on the cuvettes. aFGF and
bFGF solutions with different concentrations were pipetted into the cuvettes and the progress of the interaction was monitored
in real-time by Windows-based software, yielding kinetic and equilibrium constants for these interactions. In addition, in
order to reduce the delicate difference among the cuvettes, inhibition analyses of mixtures of FGFs and immobilized native
heparin by modified heparins were also done. The data from these two methods were similar, indicating that all sulfate groups
at 2-O, 6-O and N- in heparin were required for the binding to aFGF; and that their contribution to the binding was in the
order 2-O, N- and 6-O-sulfate group. In contrast, definite contribution of the 6-O-sulfate group to the binding with bFGF
was most apparent, while the other two sulfate groups appeared to be necessary in the order 2-O and N-sulfate group. These
methods established here can be used for analysing the effect of sulfate groups in heparin on the binding with other human
FGF members or other heparin-binding proteins.
The project supported by the Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry
of China and Zhejiang Provincial Natural Science Foundation of China (301306) 相似文献
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