PPT-VIRUSES, V IROIDS & PRIONS

Discovery of Viruses Beijerinck 1897 coined the Latin name virus meaning poison He studied filtered plant juices amp found they caused healthy plants to become sick Introduction Viruses . A. Viruses are a unique group of biological entities. 1. They are not capable of surviving without a host cell (lack metabolic machinery). 2. They do, however, contain all the information necessary to direct metabolic processes. Invasive Diseases. Infectious Disease. Also known as . Contagious Disease. Communicable Disease. Transmissible Disease. Caused by a pathogen that causes disease. Not all infections cause disease that can be transmitted. copyright cmassengale. 2. Are Viruses Living or Non-living?. Viruses are both and neither. They have . some properties of life but not others. For example, viruses can be killed, even crystallized like table salt. Bacterial Infections. Colonization by harmful bacteria. Using the body as resources to grow and reproduce. Battled by the immune system. Different numbers of bacteria needed to overwhelm the immune system and cause infection. Infectious Agents of Animals . and Plants. Chapter 14. What am I?. Structure and Classification of Animal Viruses. Classification of animal viruses. Taxonomic criteria based on. Genomic structure. DNA or RNA. STRUCTURE. A core nucleic acid - DNA or RNA. Nucleic Acid surrounded by a protein, called a capsid.. CLASSIFICATION. By genomes: DNA viruses, RNA viruses or retroviruses . (any . of a group of RNA viruses that insert a DNA copy of their genome into the . Inherited and transmissible by ingestion, transplant, and surgical instruments. Spongiform encephalopathies: Sheep scrapie, Creutzfeldt-Jakob disease, Gerstmann-Sträussler-Scheinker syndrome, fatal familial insomnia, mad cow disease. EQ: Why are viruses considered to be non-
living?. Characteristics:. *Nonliving particles made of . nucleic acid. and a . protein coat . enlosed in a . capsid. shell... *In order to reproduce, all viruses must have a . Prusiner. MD. 1942-present . KUMC Neurology Morning Report. Richard J. Barohn, MD. May 8, 2017. Stanley B. . Prusiner. Biography. YEAR. ACHIEVEMENT. 1942. Born in . Des Monies IA. 1896 Grandfather emigrated from Moscow to Sioux City, IA. MicroorganismS What we don’t see CAN kill us! Microorganisms Also called microbes Cannot be seen without a microscope May be non-pathogen or pathogen depending on where it is in body Microorganisms Prions. are infectious agents composed of protein in . misfolded. form.. initially thought to be viruses which replicated slowly within their hosts, but no nucleic acid found associated with infectious material.. As a group discuss for 1 minute. Be able to defend your answer for the class!. Are . VIRUSES. alive?. Growth and Development. Reproduce. Change Over Time. Obtain and Use Energy. Maintain Homeostasis. Dept. of Biology, 2. nd. year, 2020. Mustansiriyah. University. References:. Virology: principles and applications, John Carter and Venetia Saunders, 2013.. Principles of Molecular Virology, Alan, J. . Assist. Prof. Dr. Hussein Al . Naji. Bovine spongiform encephalopathy (BSE) is a progressive, fatal, infectious neurologic disease of cattle that resembles scrapie of sheep and goats. It was first diagnosed in the UK in 1986. Approximately 200,000 cases of BSE have been diagnosed in cattle, almost all of which were in the UK. In 1992, at the peak of the UK outbreak, 37,280 cases were reported in a single year..