1. The light transmission performance of the greenhouse The greenhouse is a light building, so the light transmittance is a basic index to evaluate the light transmission performance of the greenhouse. Transmittance refers to the percentage of the amount of sunlight that penetrates the greenhouse and the amount of outdoor lighting. The light transmittance in greenhouses is affected by the light transmission properties of greenhouse light-transmitting materials and the shadow rate of greenhouse skeleton. With the different solar radiation angles in different seasons, the light transmittance of greenhouses is also changing at any time. The light transmittance of greenhouses has become a direct factor in the growth of crops and the selection of crop varieties. In general, the multi-span plastic greenhouse is 50%-60%, the glasshouse's light transmittance is 60%-70%, and the sunlight greenhouse can reach 70%. 2. Insulation performance of greenhouses Heating and energy consumption are major obstacles to the operation of greenhouses in winter. Improving greenhouse insulation performance and reducing energy consumption are the most direct means of improving greenhouse production efficiency. The greenhouse insulation ratio is a basic measure of greenhouse insulation performance. The greenhouse insulation ratio refers to the ratio of the coverage area of ​​the greenhouse light-transmissive material with small thermal resistance to the sum of the area of ​​the greenhouse coverage structure with the larger thermal resistance. The greater the insulation ratio, the better the insulation performance of the greenhouse. 3. Durability of Greenhouses The construction of a greenhouse must take into account its durability. The durability of greenhouses is affected by factors such as the aging resistance of greenhouse materials and the carrying capacity of the main structure of greenhouses. In addition to its own strength, the durability of light-transmitting materials also shows that the light transmittance of the material is continuously attenuated with the extension of time, and the degree of attenuation of the light transmittance is a decisive factor influencing the service life of the light-transmitting material. The service life of general steel structure greenhouses is more than 15 years. It is required to design wind and snow loads to use the maximum load in 25 years; bamboo and wood structure simple greenhouse service life is 5 to 10 years; design wind and snow load use the maximum load in 15 years. Because the greenhouse operation is under high temperature and high humidity for a long time, the surface anti-corrosion of the components becomes one of the important factors affecting the service life of the greenhouse. Steel greenhouses, the main structure of the stress generally use thin-wall steel, its own corrosion resistance is poor, in the greenhouse must use hot-dip galvanized surface anti-corrosion treatment, coating thickness of 150-200 microns or more, can guarantee 15 years of use life. For wooden structures or steel bars with welded truss structures, it must be ensured that surface corrosion protection is applied once a year.
Non-Inactivated Disposable Virus Sampling Tube
This disposable Non-Inactivated virus sampling tube is an upgrade from the Hank's solution. Additional various components, such as BSA, HEPES, amino acids, cryoprotectant, etc., are added to enhance the virus integrity. It can be used for nucleic acid extraction of virus, mvcoplasma chlamydia and ureaplasma samples and later virus isolation.
This disposable non-inactivated virus sampling tube consists of fibrous swab and culture medium.The medium contains antibiotics and antimycotics for the purpose of inhabitation of bacteria and veasts overgrowth. It helps to maintain the cellular integrity and preserve the viruses, mycoplasma, chlamydiae and ureaplasma.
When collect specimens with this disposable Non-inactivated virus sampling tube, tube can be transported to the laboratory at 2-8ºC within 2 days. If it can not be delivered to the laboratory within 48hours, it should be stored at-70ºC or below, and ensure that the collected specimens are delivered to the laboratory within 1 week. Avoid repeated freeze-thaw cycles. For best performance, complete testing within 24 hours.
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