Carefully harvested apples for storage need to be picked on a sunny day and dried in the morning dew. Do not pick in the morning when the temperature is below 2 ° C, otherwise it will not be stored. Handle with care when harvesting to prevent injury to the fruit surface, and strictly select disease, insect, broken fruit, ground fruit and small fruit.

Post-harvest treatment with 3% ～ 6% calcium chloride solution to immerse the fruit can increase the hardness of the fruit and reduce calcium deficiency such as bitterness caused by calcium deficiency during the storage period of the fruit; immerse 0.5% in 250% solution ～ 1 minute or 300-500 times solution of 70% methyl tobbutin to soak the fruit can prevent saprophytic fungus from infecting the fruit during storage.

Pre-chilled apples treated in situ are scattered in the orchard for pre-cooling and cooling overnight, then classified and packed into a warehouse.

In the last two years of improved packaging, the use of plastic film storage bags to store apples has an ideal effect. The principle is: rely on the breathing of the fruit to reduce oxygen, increase the concentration of carbon dioxide, and use the permeability of the plastic film to the gas to change the storage environment Gas composition to achieve spontaneous atmosphere control. Apples are stored for 3 to 6 months by this method, and the loss rate is not more than 5%. The method is to choose a non-toxic polyvinyl chloride plastic film bag with a thickness of 0.04 to 0.07 mm to line the fruit box. After the apples are lined up, fold the bag opening and seal it inside the box. Be careful not to tighten the bag opening.

Apples that are stored in time are respiratory transitional fruits. After being harvested and placed at normal temperature, the amount of ethylene produced will increase many times. Using a gas analysis instrument, the amount of ethylene produced can be increased from 22 ppm to 1680 ppm by 10 to 17 days after harvest. , Respiratory changes occur, the fruit begins to age and lesions occur. If fruit firmness is used as an indicator, if the apple is left at room temperature for one day after harvest, its cold storage life will be reduced by more than 20 days. Therefore, Apple should be put in storage in time after packaging.

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Vtm Sampling Tube With Swab

[Sample requirements]
The collected nasopharyngeal swab samples should be transported at 2°C to 8°C and sent for inspection immediately, and the sample delivery and storage time should not exceed 48 hours.

[Testing method]
1. Before sampling, mark the relevant sample information on the label of the sampling tube.
2. According to different sampling requirements, use a sampling swab to sample in the nasopharynx.
3. The specific sampling methods are as follows:
a) Nasal swab: Gently insert the swab head into the nasal palate, stay for a while and then slowly turn to exit. Wipe the other nostril with another swab, immerse the swab head in the sampling solution, and discard the tail.

b) Pharyngeal swab: Wipe bilateral pharyngeal tonsils and posterior pharyngeal wall with a swab, also immerse the swab head in the sampling solution, and discard the tail.

4. Quickly put the swab into the sampling tube.
5. Break the part of the sampling swab higher than the sampling tube, and tighten the tube cover.
6. Freshly collected clinical specimens should be transported to the laboratory within 48 hours at 2°C to 8°C.

[Explanation of test results]
After the sample is collected, the sampling solution turns slightly yellow, which will not affect the nucleic acid test result.

[Limitations of the test method]
1. For samples that are seriously contaminated due to improper storage after collection, the final test results will be affected.
2. If the sample is not stored at the specified temperature, the final test result will be affected.

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