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1. Concept of VirusThe word Virus presents a Latin origin, meaning "poison" or "any harmful substance". Viruses are tiny particles that are found in the cells of living plants and animals, which can only be seen with microscopes. They feed on living cells and multiply with extraordinary rapidity.
Some are harmless, but many are the cause of serious diseases such as AIDS. The core of the virus contains a form of nucleic acid, either DNA or RNA, this distinguishes them from bacteria and other pathogens that are both.
Viruses lack the cellular constituents needed to live on their own, that's living in the cells as tiny parasites, and each cell is specific to a particular virus. Depending on the type of tissue that attack, viruses are classified into dermatropicos (if affected skin), pneumotropicos (if affect the lungs), Neurotrophic (if affect the nervous system), and viscerotropic (if affect the entrails and internal organs).
When viruses are active, they invade cells, they seize the reproduction of these processes in such a way that they produce thousands of viruses. In general, cells are destroyed in the process, and this is repeated over and over again. After penetrating the body, some viruses can remain dormant (inactive) for long periods, sometimes years. others are multiplying, but in limited quantities to produce symptoms.
Viruses are usually transmitted by several routes, some by air, others by saliva, bite, or through contaminated food or water. So far, there has been great progress in the prevention of diseases were, through vaccines, which immunized or stimulate the production of antibodies in the body against a specific virus.
As well as the virus attacks people also it does with computers, known as computer virus is a program or software that it Autoruns and spreads by inserting copies of itself into another program or document. It has the ability to invade the vital parts of the computer as a hard disk or ROM memory, altering the operation or boot of the computer and, what is more serious, affect programmes by altering its execution, or attack the files and destroy them, thus losing information stored.
The computer virus is associated to a program or file so it can spread, infecting computers as it travels from one computer to another. It can be transmitted by means of removable storage such as Cd, Flash drive, etc., as also in email, MSN, or web pages. The best way to fight it is to have a good antivirus installed on the computer and files filters.
2. Definition of VirusThe virus is an infectious agent, very simple organism, so tiny in size, that is invisible to optical microscope. It is filterable, since it fails to be retained by filters that prevent the passage of small bacteria. It means poison, according to its Latin Etymology, and is contagious.
To reproduce it has great dependence with respect to its host, and can only take foods that it has previously understood. To invade cell and reproduce, it causes its destruction, what makes it so dangerous. Sometimes the virus is rejected by the immune system. The vaccines are very important to strengthen this system, and repel the virus.
They are formed by a molecule of nucleic acid contained within a capsid protein, made up of smaller units called capsomers. The capsid, in some cases, have icosahedral shape, and other less frequent, you can have a head and a tail.
We can distinguish three kinds of viruses: bacteriophages, which are bacterial parasites; pathogens, such as for example, the tobacco mosaic; and the zoopatogenos, as for example, that cause rabies, mumps, colds, and poliomyelitis. In August 2008 a scientific discovery allowed to determine that the virus can make you sick to other viruses, making it more sustainable to the theory that are living organisms, despite lack of cells.
Plant viruses always contain RNA, the animals may possess DNA or RNA.
In computer science also used the word virus, to refer to malicious software that is designed to infiltrate the system to disturb the normal operation of the computer, and even to destroy data, replacing the existing files by these infected, regardless of the user's permission. They spread from one to another computer.
3 Meaning of VirusAt the behest of biology, a virus is a microscopic agent, carrier of infection, which can only multiply inside the cells of other organisms and which is the cause of a host of diseases.
Viruses swarm all over our planet and are also the most substantial body type.
They are composed of genetic material, which has the hereditary information, either DNA or RNA, a cover of protein that has the Mission of protecting these acids and in some special cases there may be a lipid bilayer which protects them when they are outside of the cell.
Note that viruses reach all agencies such as: human beings, animals, plants and they are so but so small that they must be referred from optics such as microscopes.
With respect to its form, there are flutes or icosahedra. The first is characterized by its curved lines and with a tangent that forms a constant angle and the seconds are Polyhedra composed of twenty faces.
Its origin is subject to a variety of hypotheses, they could have evolved from DNA or Fragments of bacteria, among the most mentioned.
The spread of the virus occurs in different ways, and even, each type of virus has a particular mode of transmission.
For instance, transmission vectors are organisms that transmit the virus among carriers, while plant viruses are often transmitted from insects when they are fed through the SAP. On the other hand, popular influenza virus is transmitted from the air that we breathe when people who holds it sneezes, coughs, among others.
And better known as AIDS, HIV is a virus that is transmitted mainly through sexual contact with an infected.
Virology is a branch within the microbiology which deals with the detailed study of the virus. The structure, evolution, classification, playback, mode in which infected, interaction with a host organism, immunity who have diseases that trigger, are some of the issues that deals with this discipline.
And in computer science, the word virus has become very popular since used to indicate to the program that is added to a PC via disks or other elements and at any time and automatically destroys stored data or modifies some content.