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Why can't 90mm Petri Dish be exposed for more than 4 hours?

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  • Time of issue:2021-04-21 10:51
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(Summary description)90mm Petri Dish is a kind of laboratory utensils used for microbial or cell culture. It consists of a flat disc-shaped bottom and a lid. It is generally made of glass or plastic.

Why can't 90mm Petri Dish be exposed for more than 4 hours?

(Summary description)90mm Petri Dish is a kind of laboratory utensils used for microbial or cell culture. It consists of a flat disc-shaped bottom and a lid. It is generally made of glass or plastic.

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2021-04-21 10:51
  • Views:
Information

90mm Petri Dish is a kind of laboratory utensils used for microbial or cell culture. It consists of a flat disc-shaped bottom and a lid. It is generally made of glass or plastic. Its materials are basically divided into two categories, mainly plastic and glass. Glass can be used for plant materials, microbial culture, and adherent culture of animal cells. The plastic may be made of polyethylene, and there are disposable and multiple-use ones, which are suitable for laboratory inoculation, streaking, and bacterial isolation operations, and can be used for the cultivation of plant materials. So do you know why it cannot be exposed for more than 4 hours? Let’s take a look at the editor below!


The use of 90mm Petri Dish requires great care. If it is exposed outside for more than 4 hours, it will affect its use. The "big guy" in the environment will settle quickly due to gravity, while the "little guy" will take some time to settle. This is caused by many reasons, such as the diffusion caused by the air flow pattern, which is calculated based on mathematical models. The microbial sedimentation rate per hour, we generally think that 4 hours is the period of time that the medium is exposed to a better time, and the sedimentation rate will decay after 4 hours.
Secondly, studies have shown that after 4 hours, 90mm Petri Dish inner agar will form a surface layer, which will block the passage of microorganisms to obtain water, which will affect the survival of microorganisms. In other words, it will cause the result of the detection of viable microorganisms to be lower than The actual situation requires fewer misjudgments.
In addition, once the 90mm Petri Dish is activated, it starts to lose weight due to the loss of the water in the medium. Some experiments have shown that the weight loss in the initial 4 hours is more obvious, and then it will be flat. Therefore, after a large loss of accepted weight, it cannot be used for further monitoring. The weight loss will affect the growth of microorganisms.

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