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growth characterization of anodic film on AZ91D magnesium alloy in an electrolyte of Na_2SiO_3 and KF

Journal of University of Science and Technology Beijing 2006年第5期13卷 450-455页

作者： Weiping Li Liqun Zhu Yihong Li Bo Zhao Materials Science and Engineering School Beihang University Beijing 100083 China Beijing Special Vehicles Research Institute Beijing 100072 China

Anodization of AZ91D magnesium alloy in the electrolyte solution of 0.5 mol/L of sodium silicate and 1.0 mol/L of potassium fluoride was investigated. The anodic films were characterized using optical microscopy （OM）, scanning electron microscopy （SEM）, and X-ray diffraction （XRD）. The corrosion resistance of the various anodized alloys was evaluated by a fast corrosion test using the solution of hydrochloric acid and potassium dichromate. The results showed that the addition of KF resulted in the presence of NaF in the anodic film. The thickness of the anodic film formed under a constant current density of 20 mA/cm^2 for 16 rain at 60℃ exceeded 100 gm. The growth of the anodic film could be divided into three stages based on the anodizing time; the growth rate was much faster during stage Ⅱ than in stages I and Ⅲ. The anodic film exhibited the highest corrosion resistance for the AZ91 alloy, which is attributed to the fact that the anodization was maintained until the end of stage Ⅱ.

关键词： magnesium alloy anodic film growth characterization chromate-free anodizing

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Assessment of genetic variation in tomato (Solanum lycopersicum L.) inbred lines using SSR molecular markers

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Journal of Genetics and Genomics 2008年第6期35卷 373-379页

作者： Solomon Benor Mengyu Zhang Zhoufei Wang Hongsheng Zhang State Key Lab of Crop Genetics and Germplasm Enhancement College ofAgriculture Nanjing Agricultural University Nanjing 210095 China Department of Agrobiodiversity Institute of Crop Science University of Kassel 34109 Kassel Germany and Leibniz Institute of Plant Genetics and Crop Plant Research （IPK） Corrensstr. 3 06466 Gatersleben Germany

A study was conducted to determine the genetic diversity of 39 determinate and indeterminate tomato inbred lines collected from China, Japan, S. Korea, and USA. Using 35 SSR polymorphic markers, a total of 150 alleles were found with moderate levels of diversity, and a high number of unique alleles existing in these tomato lines. The mean number of alleles per locus was 4.3 and the average polymorphism information content （PIC） was 0.31. Unweighted Pair Group Method with Arithmetic Mean （UPGMA） clustering at genetic similarity value of 0.85 grouped the inbred lines into four groups, where one USA cultivar formed a separate and more distant cluster. The most similar inbred lines are from USA, both with determinate type, whereas the most different lines are from USA （Us-16） and Japan （Ja-2） with determinate and indeterminate growth habit, respectively. Clustering was consistent with the known information regarding geographical location and growth habit. The genetic distance information reported in this study might be used by breeders when planning future crosses among these inbred lines.

关键词： Solanum lycopersicum L SSR markers genetic diversity growth characterization

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