To protect the exposed 1-2 year old saplings that cannot be safely overwinter in open fields, the entire tree body is bent to one side and covered with soil. This method is the most effective and reliable measure to prevent pumping.
Cultivate soil and protect against cold. Cultivate a mound within 30 cm of the base of the seedlings to prevent frostbite and grafting. After the spring temperature has risen and stabilized in the spring of next year, it will be removed and the tree plate will be leveled.
Whitening and anti-cold sapling whitening can ease the temperature difference between the yin and yang surface of the trunk. The cold-proof effect is better. It can be applied before the soil is frozen. The formulation of the whitening agent is: salt 0.5 kg, quicklime 6 kg, clean water 15 kg, and then add the appropriate amount of adhesive and lime sulfur residue coated over the young branches.
PVA is dried and evenly coated with a retort of polyvinyl alcohol. The tanning method is generally performed at a ratio of "polyvinyl alcohol:water=1:15 to 20". Heat the water to about 50°C, then add polyvinyl alcohol (cannot wait for the water to boil and then add, otherwise the polyvinyl alcohol can not be completely dissolved, the solution is not uniform), with stirring and stirring, until boiling, and then use slow fire After 20 minutes to 30 minutes, wait for the temperature to drop until it is hot. Http://Content/bec5540a-c177-44c2-879a-61a114048975?cType=2
RT-PCR Test Reagent Kit Of COVID-19(ORF1ab, N)
The RT-PCR Test Reagent Kit Of COVID-19(ORF1ab, N) is a real-time RT-PCR test intended for the qualitative detection of nucleic acid from the SARS-CoV-2 in upper and lower respiratory specimens (such as anterior nasal swabs, mid-turbinate nasal swabs, nasopharyngeal swabs, oropharyngeal swabs, sputum, lower respiratory tract aspirates, bronchoalveolar lavage, and nasopharyngeal wash/aspirate or nasal aspirate) from individuals suspected of COVID-19 by their healthcare provider.
Results are for the identification of SARS-CoV-2 RNA.The SARS-CoV-2 RNA is generally detectable in upper and lower respiratory specimens during the acute phase of infection.
Positive results are indicative of the presence of SARS-CoV-2 RNA; clinical correlation with patient history and other diagnostic information is necessary to determine patient infective status. The agent detected may not be the definite cause of disease. Positive results do not rule out bacterial co-infection with other viruses.
Negative results do not preclude SARS-CoV-2 infection and should not be used as the sole basis for patient management decisions. Negative results must be combined with clinical observations, patient history, and epidemiological information. The COVID-19 RT-PCR Detection Kit is intended for use by qualified trained clinical laboratory personnel specifically instructed and trained in the techniques of real-time PCR and in vitro diagnostic procedures.
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