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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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Don't be fooled by "E1" When choosing cabinets, many consumers have encountered this kind of situation: When introducing the business, the merchant emphasizes that the cabinet uses E1 material, which sounds very high-end. However, in fact, the E1 level is the mandatory test standard issued by the state, which is the environmental protection index that must be achieved. Only E1 grades are suitable for interior decoration. Therefore, consumers should pay attention to the fact that when selecting cabinets, don't be fooled by the "E1 level", and businesses will use this to drive up prices.
Don't be fooled by the low prices. There are many cabinet brands on the market today. They are also very complicated. Some inferior cabinets often use some so-called "low-price" and big discounts to attract consumers. However, in fact, many low-priced and inferior cabinets are manufactured by small workshops. The production process and quality standards of these cabinets are very different from those of high-quality cabinets. In general, if you choose a qualified plate, plus the cost of work, etc., the price per cabinet cabinet should be more than 1,000 yuan, if you encounter the price of each meter in the range of less than 500 yuan, we must be careful.
Don’t be verbally promised to flicker. Nowadays many cabinets will be labeled as “environmental protection productsâ€, “quality productsâ€, etc. But when they open their product packaging or instructions, there is no clear definition of national standards and actual content of harmful substances. Callouts. There is also an after-sales service promised by the company, which sounds very tempting, but it has been relied on afterwards. Therefore, when choosing cabinets, it is necessary to look at clearly specified material materials and environmental indicators. In particular, remember to ask for and save valid shopping vouchers and written service commitments. Do not unilaterally believe in the verbal promises of certain businesses.
Don't be fooled by the word "grade". In addition to paying attention to low-cost traps, there are still some businesses who will say "high quality". The primary consideration at this time is the design of the material and detail of the product. Compared with the high-end cabinets, their workmanship and details are all focused on excellence. However, as consumers, it is their cost-effectiveness to consider.
Editor's note: When you buy a cabinet, you will generally visit a lot of large and small exhibition halls, see more, listen to businesses that are in danger, and finally do not know how to choose. Therefore, the best way is to do a lot of homework before you buy, to know the quality of the cabinet to determine the quality, the most important thing is to look at its plate, edge, hardware accessories and other details.
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.
With the increasing demand for quality of life, functional-oriented kitchens have become one of the hallmarks of home furnishing. The slogans of “high-tech, new materials, new techniques, and new designs†are now on the market. The price ranges from several thousand to several tens of thousands. It is getting better and better, but as an eye-catching consumer, you must be careful not to be fooled by some of the tricks.