Centrifuges are commonly used in scientific production and medical systems. At present, the electric centrifuges commonly used in laboratories include low-speed, high-speed centrifuges, low-speed, high-speed refrigerated centrifuges, and ultra-speed analysis, and preparation of dual-purpose refrigerated centrifuges. The following small series will provide you with the use, maintenance and some maintenance common knowledge of laboratory centrifuge equipment, and provide some common maintenance methods for laboratory operators to ensure the normal operation of laboratory equipment.
Standard use
â— Place the centrifuge tube containing the material in the metal sleeve of the centrifuge. If necessary, pad a layer of cotton on the bottom of the tube and weigh it on the balance. Adjust the amount of material in the tube so that the weight of the two tubes together with the sleeve equal. If there is only one tube of material, the water can be stored in a tube to balance.
â— Place the centrifuge tube and its sleeve into the centrifuge moving plate in a symmetrical position and cover the cover.
â— Turn on the power and slowly move the pointer of the speed regulator to the required speed scale for a certain period of time (about 5 minutes).
â— After reaching a certain time, slowly turn the pointer of the speed regulator to zero, then close the switch.
â— After the mobile disk automatically stops rotating, the centrifuge cover can be removed to take out the centrifuge tube. Care should be taken when removing the centrifuge tube. Do not allow the precipitated material to rise due to vibration and turbidity.
â— When using a centrifuge, if the centrifuge is found to be vibrating and there is noise, the internal weight is unbalanced. If a metal tone is found, it often indicates that the internal test tube is broken, and should be stopped immediately for inspection.
â— Finally, check thoroughly and cut off the power.
Maintenance and maintenance
â— The centrifuge should be placed on a stable table to prevent the centrifuge from slipping or vibrating and causing an accident.
â— When starting the centrifuge, it should be gradually accelerated. When the sound is not normal, stop the machine and check the troubles (such as the asymmetry of the centrifuge tube, the quality is not equal, the position of the centrifuge is not level, or the nut is loose).
â— Centrifuge tubes should be placed symmetrically. If the tubes are singularly asymmetrical, add an empty tube to the same mass of water and adjust the mass to be symmetrical.
â— The sleeve of the centrifuge should be kept clean, and the bottom of the casing should be padded with soft materials such as foam plastic to avoid broken the centrifuge tube.
â— Turn off the centrifuge and gradually decelerate until it stops automatically. Do not use forced method to stop it.
â— The centrifuge should be covered to ensure safety when working.
â— The wear of the commutator and the brush should be checked regularly (about one year). If there is excessive wear, it should be replaced immediately.
â— The bearings of the motor should be filled with lubricant (eg Vaseline).
â— Perform a maintenance check once a month and fill in the instrument maintenance record.
Cleaning treatment
â— Clean and hang the logo immediately after each use, and fill in the instrument usage record.
â— Wipe the surface of the cabinet with a soft cloth and dirt. Visually, there is no detergent residue. Wipe dry with a cleaning cloth.
â— Evaluation of the effect: The inner and outer surfaces of the device should be bright and tidy without smudging.
After reading the laboratory use, maintenance and cleaning knowledge of the laboratory centrifuge equipment provided by Xiaobian, I believe that everyone will definitely care for your centrifuge! If you have any other questions in the future, please contact us at Esco. We have a strong technical service team to provide you with a full range of services. Choose Esco to give you a better choice!
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Waxy corn comes in a variety of colours. Some people wonder if waxy corn is a genetically modified product. In fact, it is not. Waxy corn originated in China. It is caused by a genetic mutation. Artificial selection gradually led to the emergence of a type of tannin.
Waxy corn, also known as waxy corn, is sticky corn. The grain has coarse, waxy endosperm, similar to shiny, glassy (clear) grains such as hard and dented corn. Its chemical and physical characteristics are controlled by a recessive gene (wx), which is located on chromosome 9. 100% of the starch in the endosperm is straight-chain starch.
Coloured glutinous corn is generally white, yellow, red, purple and black, with white, yellow and purple corn being the basic colours. Purple and white hybrids naturally become purple if the purple gene "beats" the white gene and vice versa, so if the two tie we see white and purple corn. Purple can turn into red and black corn, or as we often say, "red is purple and black is purple". Of these colourful corn, the most common yellow waxy corn is the most nutritious as it is rich in carotenoids...
Currently, the only genetically modified foods sold on the Chinese market are soybean oil and papaya. Waxy maize is a hybrid variety and is not associated with genetic modification. Therefore, it can be concluded that glutinous maize is a hybrid variety and has nothing to do with genetic modification.
Genetic modification is a type of "genetic engineering" in modern science and technology, which makes use of modern molecular biology techniques. Hybridisation is the mating of individuals of different genotypes to produce offspring that are different from the original "pure" breed. In a sense, it belongs to the natural exchange of genes that can occur in nature.
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