How marijuana affects the mind. Marijuana reaches the same pleasure centers in the brain that are targeted by heroin, cocaine and alcohol. Depending on the quantity, quality and method of consumption, marijuana can produce a feeling of euphoria â or high â by stimulating brain cells to release the chemical dopamine.
History of Penicillin. Originally noticed by a French medical student, Ernest Duchesne, in 1896. Penicillin was re-discovered by bacteriologist Alexander Fleming working at St. Mary's Hospital in London in 1928. He observed that a plate culture of Staphylococcus had been contaminated by a blue-green mold and that colonies of bacteria adjacent to the mold were being dissolved.
Penicillium chrysogenum is the fungus from which penicillin, the first antibiotic medication, is made. The medical use for antibiotics, as the name suggests, is to cure diseases that are caused by bacteria.he medication that is made from Penicillium chrysogenum, however, has become less effective due to the development of bacterial strains that are resistant to treatment with penicillin. Many people in the medical community attribute the development of these resistant strains to improper use of antibiotics.