helper virus
61Parvoviridae — A family of small viruses containing single stranded DNA. Virions are 18–26 nm in diameter, are not enveloped, and are ether resistant. Capsids are of cubic symmetry, with 32 capsomeres. Replication and assembly occur in the nucleus of infected… …
62Avsunviroidae — The Avsunviroidae are a family of viroids. At present three members are known of. They consist of RNA genomes between 246 375 nucleotides in length. They are single stranded covalent circles and have intramolecular base pairing. All members lack… …
63transduction — 1. Transfer of genetic material (and its phenotypic expression) from one cell to another by viral infection. 2. A form of genetic recombination in bacteria …
64вирус-помощник — Нормальный вирулентный штамм вируса, только в присутствии которого (при совместном заражении) дефектный вирус получает возможность размножаться в клетке хозяине, например, фаг λ gal (часть его генома замещена бактериальным геномом)… …
65AIDS — /aydz/, n. Pathol. a disease of the immune system characterized by increased susceptibility to opportunistic infections, as pneumocystis carinii pneumonia and candidiasis, to certain cancers, as Kaposi s sarcoma, and to neurological disorders:… …
66immune system — Anat. a diffuse, complex network of interacting cells, cell products, and cell forming tissues that protects the body from pathogens and other foreign substances, destroys infected and malignant cells, and removes cellular debris: the system… …
67DNA vaccination — The making of a DNA vaccine. DNA vaccination is a technique for protecting an organism against disease by injecting it with genetically engineered DNA to produce an immunological response. Nucleic acid vaccines are still experimental, and have… …
68Immune system — A scanning electron microscope image of a single neutrophil (yellow), engulfing anthrax bacteria (orange). An immune system is a system of biological structures and processes within an organism that protects against disease by identifying and… …
69Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… …
70Cell — The basic structural and functional unit in people and all living things. Each cell is a small container of chemicals and water wrapped in a membrane. Each cell in the human body there are 100 trillion cells in each of us contains the entire… …
