Can't bacteria be preserved as fossils?

Bacteria are one of the main groups of organisms and belong to the field of bacteria. It is wrong to say that bacteria cannot be preserved as fossils. Scientists found fossils similar to cyanobacteria in ancient strata 3.5 billion years ago. Cyanobacteria are larger than most bacteria and can secrete a thin cell wall. Most importantly, cyanobacteria can form large layered structures, which are called stromatolites. If this stromatolite is ground into thin slices, tiny cyanobacteria and algae fossils may be found in it.

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Precautions:

When freeze-drying, the slow freezing speed will easily lead to the formation of large ice crystals in cells, which will cause mechanical damage to the cell structure. The degree of vacuum drying will also affect the cell structure, and the protective agent is added to minimize the damage of freeze-drying to the cell structure. The destruction of cell structure not only increases the mortality of strain preservation, but also easily leads to strain variation, which leads to the decline of strain performance.

It is best to use a culture medium with less carbon source and less nutrients for inclined plane low temperature preservation, otherwise it is easy to produce acid or enhance metabolic activity, which will affect the preservation time. The preservation of sand pipes should thoroughly clean sand and soil to prevent them from containing too much organic matter, affecting the metabolism of bacteria or producing some toxic substances after sterilization.

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