On March 28th, the Financial Times said, “Rioto is evaluating the future development prospects of three diamond mines in Australia, Canada and Zimbabwe and a development project in India.†The Financial Times also stated that Extension will consider a number of options in the assessment, including sale and listing. This is another mining company that has been reported to be planning to sell diamonds after BHP Billiton. At the same time, Rio Tinto's chief financial officer Guy Elliott said at the Reuters Global Mining and Metals Summit that Rio Tinto's aluminum assets "have a lot of options", such as selling all or part of aluminum assets, initial public offerings. (IPO), or directly distribute shares of the aluminum business to shareholders. Data from foreign media shows that Rio Tinto's diamond business last year only accounted for less than 0.1% of the group's net profit, diamond revenues decreased by 86%, and only $10 million in all of the $727 million in revenue. At the same time, the 11.7 million carats of diamonds last year were only one-third of the world's two major diamond producers, Alrosa and DeBeers. It is worth noting that analysts have estimated that once Rio Tinto really sells its diamond business, it will receive about $2 billion in revenue. At present, Rio Tinto owns 100% of the Australian Argyle mine, 60% of the Canadian Diavik mine and 78% of the Zimbabwe Murowa diamond mine. In terms of aluminum assets, Rio Tinto is also streamlining optimization. Rio Tinto announced last year that it would streamline its aluminum products group and its 13 aluminum assets will be stripped off. “The direction of stripping is mainly downstream processing of the aluminum industry,†a mining source told reporters. “From Rio Tinto’s strategy, it is more willing to develop upstream mining operations. This is also in line with its pursuit of 'low asset cost, production and mining. The goal of long life is.†It is understood that Rio Tinto is planning to accelerate the layout of the upstream bauxite resources. In fact, BHP Billiton and Vale have been continually optimizing their business operations in recent years. The former also announced last year that it plans to sell part or all of its diamond business; the latter had integrated aluminum assets with Hydra, the world's third largest aluminum company, in 2010, and sold several downstream aluminum processing companies to Hydro. In exchange for a 22% stake in the company. In the opinion of analysts, the miners' actions are not difficult to understand because they can concentrate more on resources such as iron ore. From the financial report data, the most important source of profit for the three major miners actually comes from iron ore. The Financial Times also quoted Ryan Long, head of equity research at Northland, as saying, “For these mining companies involved in a variety of commodities, it is very difficult to expand market share.†He believes that for miners, Focusing on other areas of higher efficiency is a “wise moveâ€. However, the industry believes that for several major miners around the world, they also have to streamline their operations and consolidate their advantages in related fields. Because once the world's fourth largest integrated mining company Xstrata and Swiss commodity trading giant Glencore (Canonco) successfully merged, or will have a new market value of 90 billion US dollars will become another giant in the global mining industry, and rely on Jia It can hardly affect the companies such as Rio Tinto and BHP Billiton in the global trade position in the field of commodities for decades.
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.
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
1. Make the object to be observed form a thin film, which is easy to transmit light and easy to observe;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.
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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