Possessive Nouns. Possessive nouns are used to indicate ownership. Possessive nouns usually are formed by adding an apostrophe (') and s. When a noun is plural and ends in s, just add an apostrophe ('). If two people own one thing, add the apostrophe and s to the second person only. If two people own separate things, add the apostrophe and s for each person.
Types of antibiotics. There are hundreds of different types of antibiotics, but most of them can be broadly classified into six groups. These are outlined below. Penicillins (such as penicillin and amoxicillin) â widely used to treat a variety of infections, including skin infections, chest infections and urinary tract infections.
A broad-spectrum antibiotic can be used to treat a wide range of infections. A narrow-spectrum antibiotic is only effective against a few types of bacteria. Some antibiotics attack aerobic bacteria, while others work against anaerobic bacteria. Aerobic bacteria need oxygen, anaerobic bacteria do not.