1. The anti-freezing effect of the fumigant can cause a fire to be created around the greenhouse when the cold wave comes. There is one every tens of meters. The fire is made of a mixture of chaff and sawdust. These materials are stacked and burned around the greenhouse. The large amount of smoke produced can prevent frost. In the shed, some fumigants can also be properly lighted. However, the air pollution is more serious. I wonder if Fujian can use this method. 2, spraying plant antifreeze, the role of antifreeze First, when the temperature drops, it is necessary to maintain the normal liquid crystal phase of the biofilm in the body. Second, it has a structural stability, which is positively related to the cold resistance of plant species; Third, intracellular ice formation can be prevented to prevent ice crystals from damaging the membrane. Fourth, intracellular water flow to extracellular icing can also cause certain damage. This is due to dehydration of the ice and can lead to cell drought and protein denaturation. At the same time, it will also cause cell seizures to shorten and fall, causing damage to the plasma membrane.
Cannulated screw is a common internal fixation device in orthopedic surgery.
Working process
During the operation, the Kirschner wire with the hole matching the hollow screw is first drilled into the bone of the fracture site, and then the hollow screw is screwed into the fracture site through the guidance of the Kirschner wire. Finally, the Kirschner wire is pulled out to complete the fixation of the fracture site. In many cases of fracture of the neck and femur, the healing cycle is long, and it usually takes about 30 months to remove the cannulated screws. At this point, the bone and the surface of the cannulated nail are closely connected and firmly connected in the nail path, which leads to defects easily generated by conventional nail removal methods, causing secondary injury at the fracture healing site and causing pain to the patient. Percutaneous cannulated screw internal fixation for femoral neck fractures has the advantages of small trauma, good healing, low rate of femoral head necrosis, and good stability.
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