| The physiological and biochemical effects of tellurium (Te) on Spirulina wereinvestigated by detecting the changes of antioxidaze system, pigments and protein. Andthe metabolism,absord and biotransformation of Spirulina on Te were studied bydetermining different forms of tellurium. Here are some important results:1. Te was added to S. platensis and S. maximum on different periods of the growth. Itwas indicated that the growth of Spirulina was promoted and the content of MDA wasthe lowest by adding Te at its stable growing period. In the test set, the peroxidationlevel of Spirulina was the lowest and the Spirulina in the best condition. Te dose (xTe)was used in the section in order to explain the different effects between different testsets. xTe was a dynamic parameter, which was defined that the ratio between Tecontent(CTe) and the biomass at the same moment.2. Te of different concentrations was added into the medium at stable growing period ofS. platensis (7d,8d and 9d). It was indicated that the contents of MDA were lowerthan the control at CTe≤900 mg·L-1 and its growth was promoted. The content ofMDA was higher and its growth was inhibited at 1000 mg·L-1. The contents ofsoluble protein and pigments were increased in all test sets.3. The different Te dose(xTe) were set, and keep the xTe invariable. It was indicated thatthe growth of S. platensis was promoted and the contents of protein and pigmentswere higher than the control at xTe≤0.2, whereas its growth was inhibited, the contentof protein was decreased and MDA was increased at xTe=0.4. It implied that at xTe≤0.2, Te was nutrient to the S. platensis, and at xTe≥0.4, Te was poisonous to it.4. By series of test sets, it was indicated that the antioxidant enzymes were sensitive toTe stress and the changes of them were complicated. Especially, the activicty of GPXwas increased with Te stress, which implied that tellurium has similar biochemicaleffects with selenium.5. It was indicated that S. platensis was a great biologic carrier for Te. The Te organicratio reached 75～80% in S. platensis, but the ratio of gaseous Te was only 24.7%～67.6%, which was low. In the other test sets, xTe was kept invariable and it was found that most of Te was discharged from cells by the way of gaseous Te and it was86.7%～91.0% of the Te added. The content of gaseous Te increased with xTeincreasing, while the content of organic Te decreased with xTe increasing and theywere lower. The first research was benefit to get great S. platensis containing moreorganic Te, while the second research was more valuable in restoring the pollutionfrom Te.6. Te in S. platensis was combined to different components(solid remains, water-solubleprotein and non-protein soluble substances). The biochemical molecules(protein,polysaccharides,lipids and nucleic acid) were combined to Te, which implied that Tewas similar with Se in biology. |
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