When there is liquid in the Pipette tip, do not place the pipette horizontally or upside down, so as to prevent the liquid from flowing back and corroding the piston spring.In the process of biological experiments, especially in the field of Cell Culture, the pipette is an indispensable laboratory instrument, and the pipette holder is also used very frequently on the laboratory ultra-clean bench or in the biological safety cabinet. The ease of use of the pipette and the pipette holder also affects the ease of experimental operation.
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According to Antaike's investigation, the price of tungsten concentrate in North Korea is relatively low, so companies are importing from overseas.
According to the statistics of China Customs, the import volume of tungsten products in China in July 2009 was 10.45 million US dollars, down 15.86% from the previous month. The cumulative import value from January to July was 67.3 million US dollars, a decrease of 21.23% compared with the same period of last year. In July, China imported 1026 tons of tungsten ore and concentrate, down 8.88% from the previous month, and imported 5,724 tons from January to July, an increase of 2.5% over the same period last year. The decline in imports of tungsten concentrates has been curbed and may continue to grow in the later stages. Of which, imports were 1,422 tons from Canada, down 22.17% year-on-year; 2,143 tons were imported from Russia, up 69.52% year-on-year; 310 tons were imported from the Democratic Republic of Congo, not imported in the same period of 2008; 203 tons were imported from Vietnam, up 1107.4% year-on-year; imports from Rwanda 506 tons, an increase of 34.42%. Foreign tungsten ore bodies are not large, but the grade is high, so the output may suddenly increase. The volume of tungsten ore imported from North Korea, Russia and Rwanda has increased significantly, and the price of tungsten ore in these countries is even 1/3 lower than that of the country.