An attempt was made to compare the biological value of the biological mass of the hydrogen bacteria Tydrogenomas eutropha, of meat and wheat on the ground of the fractional and amino acids composition of their proteins. Substantial differences in the distribution of proteins and amino acids in all of the three objects examined were revealed. It is shown that more than one half of the entire protein contained in the biological mass of the hydrogen bacteria is made up of poorly soluble structural proteins difficultly amenable to the action of digestive enzymes. It is this fraction where the bulk of essential amino acids is concentrated. The data obtained imply that the biological value of the biological mass of hydrogen bacteria is higher than in wheat, but lower than in meat.
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