Name the scientists who were credited for showing the role of Penicillin as an antibiotic.
Its full potential as an effective antibiotic was established much later by Ernest Chain and Howard Florey. This antibiotic was extensively used to treat American soldiers wounded in World War $II$. Fleming, Chain and Florey were awarded the Nobel Prize in $1945$ , for this discovery.
An immunosuppressive agent used in organ-transplant patients is
The first antibiotic was discovered accidently by __$A$__ while working on __$B$__.
Arrange the following in the decreasing order (most important first) of their importance, for the welfare of human society. Give reasons for your answer.
Biogas, Citric acid, Penicillin and Curd