The cover glass is covered on the material on the glass slide, which can avoid the contact between the liquid and the objective lens, so as not to contaminate the lens, and can make the top of the observed cells in the same plane, that is, the distance from the objective lens is the same, so that the observed Images are clearer.Why do you need a coverslip when using a microscope
The purpose of staining the specimen with iodine solution is to make the cells more obvious under the microscope, and it can also kill the cells and prevent the cells from migrating.
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There is the “World Tungsten Capitalâ€, which is known as the “Tungsten Capital of the Worldâ€. Among them, the reserves of high-quality black tungsten ore account for about 70% of the same kind of mines in the country and 60% of the world. Therefore, the guidance price of tungsten products of Ganzhou Tungsten Association is quite weighty. It pointed out that the price of black tungsten concentrate, APT and medium-grain tungsten powder in May was 133,000 yuan/ton, 200,000 yuan/ton and 310 yuan/kg, respectively, up 9.1% and 5.8% respectively in April. 5.8%.
At present, three of the domestic listed companies cover the tungsten industry chain, namely Xiamen Tungsten, Hunan Nonferrous (Hong Kong listed) and Zhangyuan Tungsten. The rise in tungsten prices is good for enterprises. Zhangyuan Tungsten Industry Co., Ltd. is located in Zhangzhou, with tungsten concentrate mining, smelting and deep processing of tungsten products.
The company's director said that the company's quarterly report fell by -43.97% year-on-year, and the first half of the year is expected to reduce by 30 to 60%, because the company is mainly order sales, most of the first half of the implementation of the previous orders. Recently, the company's tungsten products are also in the market, and the price will be gradually reflected in the third quarter.
The rise in tungsten prices has not been affected by the decline in exports, and domestic policies have a greater positive effect. The first is the industry access policy, which increases the barriers to entry. Second, the market is rumored that the State Reserve Bureau will entrust China Minmetals to collect and store tons of tungsten concentrate, which will bring a strong agent to the spot tungsten price.
According to rumors in the industry, the State Reserve Bureau will collect and store tungsten concentrates through China Minmetals, and this storage will exceed 10,000 tons. However, this news has not been confirmed by China Minmetals.
Many people in the industry expect that with the start of the collection and storage work, tungsten prices are expected to rise steadily. "The background of this storage is mainly in late March this year, the spot price of tungsten has fallen, and once fell by several thousand yuan per ton." A sales person in charge of a tungsten production enterprise in Ganzhou, Jiangxi Province said.
For China's traditional strong variety of tungsten, the future price depends on China, China's price depends on policy. Therefore, we believe that the further increase in tungsten prices can be expected. Risks need to pay attention to the implementation time and intensity of the policy.
2. Make the specimen relatively fixed;
3. It is convenient to use the capillary phenomenon to form a gradient when adding various reagents (staining agent, acid, salt solution);
4. Avoid contamination of the specimen.
Abstract In April, the price of non-ferrous metals collectively weakened, causing market panic, but a small metal with strong resistance to decline is tungsten. Tungsten has continued to rise in the past year, causing widespread concern. There is the “World Tungsten Capitalâ€, which is known as the “Tungsten Capital of the Worldâ€. Among them, high-quality black tungsten deposits have reserves...
In April, the price of non-ferrous metals collectively weakened, causing market panic, but a small metal with strong resistance to fall is tungsten. Tungsten has continued to rise in the past year, causing widespread concern.