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.
Antibiotics can be classified in different ways. Broad-spectrum vs Narrow-spectrum. Narrow-spectrum antibiotics act against only limited types of bacteria. List of narrow-spectrum antibiotics and their spectrum of activity: 1  Penicillin, Flucloxacillin, Dicloxacillin, Nafcillin sodium: Gram-positive bacteria. 2  Aztreonam: Gram-negative aerobic bacteria. 3  Linezolid: Gram-positive bacteria. 4  Polymyxin B: Gram-negative bacilli other than proteus.