The light intensity in the greenhouse directly affects the photosynthetic efficiency of watermelon, and then affects the sweetness and quality of watermelon. The light intensity in the shed changes due to factors such as weather, regional latitude and time, and increases with the increase of external light intensity.
In the north-south greenhouse, the light intensity in the morning is strong in the east and weak in the west, while in the afternoon it is strong in the west and weak in the east. The difference between the north and the south is small. If a small shed is built in the big shed, the heat preservation effect is improved, but the light transmittance of the multilayer film is reduced by 40% to 50% compared with the single film. The number of columns in the shed, the type of shed film, the old and new, and the degree of pollution can all affect the light intensity in the shed.
To increase the light intensity in the shed, we must first try to choose a non-drip film to avoid the influence of dew on the surface of the shed film on the light transmittance. Secondly, pay attention to keeping the shed film clean during management operations, reduce dust, dirt, etc. attached to the shed film to reduce the intensity of light. Thirdly, we must strictly pruning and topping in time to ensure that the light from the top and sides of the greenhouse can penetrate smoothly. Especially for the rack cultivation, the space between the leaves on the top of the rack and the roof of the shed should be kept at least 30cm. The small shed in the fourth big shed should be removed in time after the temperature in the shed stabilizes to ensure the plant's need for light intensity. Fifth, the silver-gray mulch film on the ground can increase the intensity of the reflected light near the ground, and it should be laid according to the conditions.
When the light intensity in the shed in early spring or rainy weather is too low, additional artificial auxiliary light sources or reflectors can also be considered to ensure the photosynthetic needs of the watermelon.
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Virus Specimen Collection Tube
Inspection principle:
It can perform protein denaturation on fresh clinical virus samples to inactivate the virus, prevent secondary transmission of infection, and ensure the safety of transportation and testing personnel.
♣.Structural composition: Combination of cotton swab and transport medium (VTM).
♣. Product requirements:
The product should be airtight, avoid high temperature, avoid direct sunlight storage. It should be used in a clean, hygienic, pollution-free, and temperature-friendly environment.
♣, Storage conditions and validity period:
â‘ , the product should be stored in a clean, dry and ventilated environment,
②, the temperature is 5℃-35℃;
â‘¢, relative humidity <85%RH;
â‘£, product shelf life: 12 months.
♣. How to use
â‘ Before sampling, mark relevant information on the label of the sampling tube.
â‘¡. Sampling with the corresponding cotton swabs.
â‘¢ After the collection is completed, quickly put the cotton swab into the collection tube, break the part higher than the sampling tube, and tighten the tube cover.
â‘£. For the specific sampling method, please refer to the following:
a) Nasal swab Gently insert the sampling head into the nasal cavity, stop for a while and then slowly rotate to exit, immerse the collected specimen in the Xiangxiang solution, break the excess part and discard it, and tighten the sampling tube cover.
b) Pharyngeal swab: Wipe bilateral pharyngeal tonsils and posterior pharyngeal wall with the sampling head, immerse the collected specimen in the sampling solution, break off the excess part and discard it, and tighten the cap of the sampling tube.
c), Mycoplasma Chlamydia, Ureaplasma specimen collection
Male: Insert the sampling head into the urethra about 2cm and rotate, stay for a while and then exit, and immerse the collected specimen in the sampling solution.
Female: Wipe the mucus of the cervical orifice, insert the sampling tip into the cervical canal for 1-2 cm for sampling, immerse the collected specimen in the sampling solution, break off the excess part and discard it, and tighten the cap of the sampling tube.
♣. Precautions
1. After the virus is collected, the disposable sampling swab should be completely inserted into the preservation solution, so that the virus can be retained to the greatest extent possible.
â‘¡ The collected specimens must be sent for inspection in time.
â‘¢. It is forbidden to use products with damaged packaging and expired validity period to prevent pollution.
This single-use Virus Sampling Tube is used for in vitro diagnosis. It cannot be used for human or animal oral or external use. If swallowed, it may cause serious events; it is irritating to eyes and skin. If it is not splashed into the eyes, rinse with water.
Virus Sampling Tube,Virus Specimen Collection Tube,Viral Transport Tube,Saliva Virus Sampling Kit
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