First, the pharmaceutical fumigation method fumigation method to prevent intrusion of fruit disease. Pears are first sealed with a plastic film, and then a fumigant (such as acetaldehyde) is placed in a sealed plastic film so that the fumigant concentration in the plastic film reaches 0.5% for 180 minutes, or the fumigant concentration in the plastic film reaches 1 %, hold 120 minutes.

Second, the liquid soaking method This method is mainly to prevent pears infected by bacteria after harvest. The pears were soaked in a 400-fold 4% agricultural anti-120 fruit tree-specific liquid for 50 minutes, then they were taken out for drying, and then packaged for storage.

Third, the calcium treatment method will pear fruit into 1% to 5% calcium chloride solution soak 1 to 5 minutes. According to experts, increasing calcium can inhibit the respiration of pears, reduce ethylene production, and can reduce the incidence of pear black heart disease, snow pear red meat, but also can improve the pear's resistance to carbon dioxide, improve storage.

Fourth, the paint treatment method applies a special coating agent for fruit on the surface of the pear, and the coating agent is dried to form a thin film. The film can hinder the gas exchange and moisture evaporation of the fruit to a certain extent, and improve the storage effect.

A Petri Dish (alternatively known as a Petri plate or cell-culture dish) is a shallow transparent lidded dish that biologists use to culture cells[1][2], such as bacteria, or small mosses.[3] It is the most common type of culture plate.

The container is named after the German bacteriologist Julius Richard Petri.[4][5]

Penicillin, the first antibiotic, was discovered in 1929 when Alexander Fleming noticed that mold that had contamined a bacterial culture in a Petri dish had killed the bacteria all around it.

The Petri dish is one of the most common items in biology laboratories, and has entered popular culture. The term is often written in lower case, especially in non-technical literature

Petri Dish

Sterilized Petri Dish,Petri Dish,Disposable Petri Dish,Lab Consumables Petri Dish

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