| Diatom is a kind of tiny plants with single cell or more cells which grows in the sea or fresh water. Diatoms are rich in vitreous silica wall with plenty of porosity, which is in wide application. Currently diatoms have great application value in industry, medicine, food, feed, environmental purification area, etc.The research results of this topic are as follows:(1)We have collected168kinds of diatoms in Hainan sea area, made clear its distribution, and gave analyses for the distribution of the regional differences of diatoms;(2)We have got pure Thalassiosira, Chaetoceros, Naviculaceae and Licmophora by flat panel separation and micro-straw method from the collecting sea water;(3)Effects of nitrogen, phosphorus, iron and silicon on the growth of Thalassiosira are studied by single factorial experiment. The results show that the optimal concentration of silicon is10mg/L with sodium silicate for silicon source; NaNO3is the best one in the three different N resources and its optimum mass-concentration is30mg/L; KH2PO4is good for Thalassiosira as P resource and its optimum mass-concentration is0.5mg/L; In two different Fe resources, ferric citrate is good for the growth of Thalassiosira and its optimum mass-concentration is0.2mg/L.(4) Patterned, nanostructured, silicate-based phosphors with the capacity to convert light from near-UV to red wavelengths were synthesized via metabolic insertion of europium in live Navicula. Structural and photoluminescent properties of the sample were analyzed by X-ray diffraction, field emission scanning electron microscopy and a fluorescence spectrophotometer. Red emission (614nm,5Do-7F2) was obtained at394nm due to the7Fq-3L6transition of Eu3+. |
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