HUBS1416 Lecture Notes - Lecture 6: Tinea Versicolor, Antonie Van Leeuwenhoek, Giardia Lamblia
12 Oct 2018
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Define the main types of microorganism that cause disease in humans. Microorganisms or microbes is a microscopic organism, which may be a single cell or multicellular organism. Microbes were discovered by anton van leeuwenhoek on 1673 using a microscope he designed. Louis pasteur proved the existence of microbes and dispelled the theory of spontaneous generation. Eukaryotes, possess rigid cell wall of chitin and glucan (polysaccharides). Can be unicellular (e. g. yeasts) or multicellular (e. g. Can be unicellular (e. g. yeasts) or multicellular (e. g. moulds). Have cell membrane and membrane-bound organelles (no nucleus). Found in aqueous and soil, as well as in animals and insects. Some can be seen with the naked eye. Has cell membrane usually surrounded by cell wall. Can vary enormously in size and shape (e. g. cocci, bacilli, spiral). No nucleus, organelles or cytoplasm but contain genetic material. Ectoparasites: live on surface of body e. g. fleas, lice, mites. Describe the key fungi, protozoa and multicellular parasites that infect humans.
