The dangers of accidentally eating expired yeast

Fermentation is something we often encounter in our daily lives. If it is fermented by beneficial bacteria, it can actually make a lot of delicious food. So we can see a lot of yeast on the market. Some people may not realize that yeast actually has a shelf life. So, if we accidentally eat expired yeast, what harm will it cause to our health?

Yeast (saccharomyce) is a eukaryotic receptor cell commonly used in gene cloning experiments. Cultivating yeast is as convenient as culturing Escherichia coli. There are also many types of yeast cloning vectors. Yeast also has plasmids. This 2pm long plasmid is called a 2um plasmid, which is about 6300bp. This plasmid exists outside the chromosome in the cell nucleus for at least some time. Using the 2pm plasmid and the plasmid in Escherichia coli, a shuttle plasmid that can shuttle between bacteria and yeast cells can be constructed. Yeast cloning vectors are all constructed on this basis.

Yeast is a unicellular fungus and is not a unit of systematic evolutionary classification. A tiny single-cell microorganism that is invisible to the naked eye. It can ferment sugar into alcohol and carbon dioxide. It is distributed throughout nature. It is a typical heterotrophic facultative anaerobic microorganism that can survive under both aerobic and anaerobic conditions. It is a natural fermentation agent.

Generally refers to various single-cell fungi that can ferment sugars. They can be used in brewing production and can also be pathogens - model organisms for genetic engineering and cell cycle research. Yeast is the earliest microorganism used in the history of human civilization. There are more than 1,000 known species of yeast. Yeast can be divided into three categories based on their ability to produce spores (ascospores and basidiospores): spore-forming strains belong to ascomycetes and basidiomycetes. Fungi that do not form spores but reproduce primarily by budding are called imperfect fungi, or "pseudoyeasts" (yeast-like fungi).

Currently, very few yeasts are known to be classified into the phylum Ascomycota. Yeast is widely distributed in nature and mainly grows in a slightly acidic, humid, sugary environment. In February 2018, the precise customized synthesis of yeast long chromosomes won the Ministry of Science and Technology's Top Ten Scientific Advances in China in 2017.