PPT-Viral and Host characteristics of a child with perinatal HIV-1 after prolonged period

Avy Violari Mark Cotton Louise Kuhn Diana Schramm Maria Paximadis Shayne Loubser Sharon Shalekoff Bianca Da Costa Dias Kennedy Otwombe Afaaf Liberty . 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. prepared by . . Dr. ROZHAN YASIN KHALIL. FICOG. CABOG. HDOG.MBCHB. 2012-2013. Prolonged pregnancy :. . is pregnancies of 294 days duration or more also defined as . HIV infected T-cell. Viral Structure. not . cells. small . infectious particles . w/. DNA or RNA enclosed . in a protein coat . (capsid). in . some cases. , a membranous envelope. Viral Genomes. genomes . Introduction to viruses . Viruses consist of a nucleic acid (either DNA or RNA) associated with proteins encoded by the nucleic acid. The virus may also have a lipid . bilayer. membrane (or envelope) but this is acquired from the host cell, usually by budding through a host cell membrane. If a membrane is present, it must contain one or more viral proteins to act as . Presentation by. Seema. Hassan . Satti. Ph.D. 1. st. semester. 00-arid-1057. Botany Department. INTRODUCTION. RNA silencing is a homology-dependent gene inactivation mechanism that regulates a wide range of biological processes including antiviral defense. . Are Viruses Living or Non-living?. Biologists consider viruses to be non-living because:. Are not cells. Do not grow or respond to their surroundings. Cannot make food, take in food, or produce wastes. apsid. N. ucleic Acid. R. eceptors. DNA or RNA. Membrane around virus. Proteins that help virus get into proper host. Attachment. The virus attaches to receptors on the host cell.. The virus is able to get into the cell in one of three ways.. OVERVIEW. Key Take-Home Ideas. History of the virus. How was it discovered?. Where did it come from?. Clinical manifestation of HIV/AIDS. HIV classification. Genome and morphology of the virus. Viral Life Cycle. Are Viruses Living or Non-living?. Biologists consider viruses to be non-living because:. Are not cells. Do not grow or respond to their surroundings. Cannot make food, take in food, or produce wastes. Viruses consist of a nucleic acid (either DNA or RNA) associated with proteins encoded by the nucleic acid. The virus may also have a lipid . bilayer. membrane (or envelope) but this is acquired from the host cell, usually by budding through a host cell membrane. If a membrane is present, it must contain one or more viral proteins to act as . . PATHOGENESIS. The. . study. . of. . viral. . pathogenesis elucidates. . this. . special. . relationship. . between. . the. . virus. . and. . the intact. . host.. . The. . term. . BCH 4I4. LECTURE 7-9. Survey of structural properties of different classes of viruses . S.O Anadozie (Ph.D. .). VIRUSES. A virus is a small filterable and obligate intracellular parasite requiring a living host for its multiplication . Viral Replication. Viruses multiply only in living cells (As viruses are obligate intracellular pathogens they cannot replicate without the machinery and metabolism of a host . cell). . . The . host cell must provide the energy and synthetic machinery and the low-molecular-weight precursors for the synthesis of viral proteins and nucleic acids. . 3rd. Lecture . Generalized Structure of Viruses. Viral components. Nucleic acids. Capsid. Envelope. Glycoprotein. Basic virus structure. Capsid protein. Nucleocapsid. Naked capsid virus. DNA. RNA. or.