background preloader

Viruses

Facebook Twitter

How Viruses Work" If you have read How Cells Work, you know how both bacteria cells and the cells in your body work.

How Viruses Work"

A cell is a stand-alone living entity able to eat, grow and reproduce. Viruses are nothing like that. If you could look at a virus, you would see that a virus is a tiny particle. Virus particles are about one-millionth of an inch (17 to 300 nanometers) long. Viruses are about a thousand times smaller than bacteria, and bacteria are much smaller than most human cells. A virus particle, or virion, consists of the following: Nucleic acid - set of genetic instructions, either DNA or RNA, either single-stranded or double-stranded (see How Cells Work for details on DNA and RNA)Coat of protein - surrounds the DNA or RNA to protect itLipid membrane - surrounds the protein coat (found only in some viruses, including influenza; these types of viruses are called enveloped viruses as opposed to naked viruses) Viruses vary widely in their shape and complexity.

Virus- what they are & how they work. How a virus works. Viruses - Curriculum Center. Microorganisms. What is a Virus? By Dr Ananya Mandal, MD Viruses are tiny organisms that may lead to mild to severe illnesses in humans, animals and plants.

What is a Virus?

This may include flu or a cold to something more life threatening like HIV/AIDS. How big are viruses? The virus particles are 100 times smaller than a single bacteria cell. The bacterial cell alone is more than 10 times smaller than a human cell and a human cell is 10 times smaller than the diameter of a single human hair. Are viruses alive? Viruses by themselves are not alive. The virus particle or the virions attack the cell and take over its machinery to carry out their own life processes of multiplication and growth. Structure of a virus A virion (virus particle) has three main parts: Nucleic acid – this is the core of the virus with the DNA or RNA (deoxyribonucleic acid and ribonucleic acid respectively). Receptors Viruses are not simply taken into cells. How do viruses infect? Viruses do not have the chemical machinery needed to survive on their own.

Sources. Virus Photos. Viruses - What is a Virus? (Part 01) Introduction & Research. Virus: types and diseases. Most deadly virus. By Daily Mail Reporter Updated: 15:36 GMT, 28 November 2011 Scientist responsible is bracing himself for a media stormJust five tweaks to H5N1 makes it more contagiousContagious version of bird flu could cause pandemicScientists divided over whether findings can be released A group of scientists is pushing to publish research about how they created a man-made flu virus that could potentially wipe out civilisation.

Most deadly virus

The deadly virus is a genetically tweaked version of the H5N1 bird flu strain, but is far more infectious and could pass easily between millions of people at a time. The research has caused a storm of controversy and divided scientists, with some saying it should never have been carried out. Deadly: The new strain of bird flu could wipe out millions of people at a time The current strain of H5N1 has only killed 500 people and is not contagious enough to cause a global pandemic. The research done was part of an international drive to understand H5N1 more fully.

Virusworld : HPV. Go to the C15 Model on this site | VIROLOGY highlight blog: The common cold in 3D Movies (see You Tube entries below if any) (+): Images used as slide screen saver during the Positive Strand RNA virus 2010 in Atlanta.

Virusworld : HPV

Images were created from PDB coordinates from Viperdb. Most of these series of images were created with molecular graphics software Qutemol, VMD or Chimera. See "About Images" for more information about software used. Note: The images also appear when selecting from individual virus names. Permission is granted for the non-profit educational use of the PS10 images in classrooms and seminars. Use the pull-down menu above to select the virus you wish to see. To search this web site enter a keyword below: Common Cold Photo &Remedy. - The Common Sage can have white, greenish-grey or purplish-red leaves.

Common Cold Photo &Remedy

Often, Sage products and preparations refer to, or contain 'Red Sage'. This is not a different species, it is still Common Sage, but the plants with purplish-red leaves have been used. According to medical herbalists, the red leaf sage is the preferred medicinal variety. The genus name 'Salvia' is derived from the Latin 'Salvare', to be saved, an ancient reference to Sage's curative abilities. The following saying from the Middle Ages also suggests the importance of Sage's healing properties: "Why should a man die while sage grows in his garden? "! From at least as far back as the Middle Ages, Sage has been documented as a 'cure-all' with references to longevity in folk medicine. Commercially, Sage has always been very popular for culinary use, with its very strong, distinctive taste and aroma. In Chinese medicine, Sage is a 'Yin' (female) tonic with a reputation for supporting the Nervous System.