Viruses are infectious agents that are not cellular in nature. They consist of a nucleic acid genome packaged within a protein shell. Although relatively simple, viruses exhibit significant diversity in terms of size, genome organization, and capsid architecture. All viruses are obligate intracellular ...
通读全文,尤其是第一段的“Infectious disease is all around us. Disease-causing agents, such as viruses, usually have specific targets. Some viruses affect only humans; other viruses live in or affect only animals. Problems start when animal viruses are able to infect people as well, a process...
Viruses are microscopic infectious agents that contain genetic material, eitherDNAorRNA, and must invade a host in order to multiply. Predominantly, viruses are known for causing disease, as they've triggered widespread outbreaks of illness and death throughout human history. Recent examples of virus...
The meaning of VIRUS is any of a large group of submicroscopic infectious agents that are usually regarded as nonliving extremely complex molecules, that typically contain a protein coat surrounding an RNA or DNA core of genetic material but no semiperme
I. Viruses are more closely related to chemical matter than to a living organism. II. Viruses and bacteria are the only infectious agents found in plants and animals III. All viruses are obligate parasites of cells, the majority do not cause disease. ...
Viruses are ubiquitous infectious agents involved in both overt clinical as well as subclinical or undetectable interactions with eukaryotic cells. It is now widely recognized that various viruses of man and experimental animals may affect the immune response mechanisms to a variable degree (1,6,10)...
Many of these infectious agents are not only endemic threats in different parts of the globe, but are also considered to have the potential of being used as bioterrorism agents.this review focuses on inhibitors that are currently in use in the research community against specific emerging infectious...
Viruses are microscopic infectious agents, and up to 10,000 smaller than mostbacteria. They are the most common biological structure on our planet, being more numerous than animals, plants, fungi, parasites and bacteria together. Viral shapes ...
Koch original observations about the transmission of acute infectious agents are difficult to apply to cancer because of the multi-factorial nature of cancer and because tumorigenic viruses are generally present in a large part of the population without causing disease. Sir Austin Bradford Hill's ...
Thediseasethat these organisms cause is only incidental to their struggle for survival. Most of these agents do not require a human host for theirlife cycles. Many survive readily insoil, water, or lower animal species and are harmless to humans. Other living organisms, which require the...