There is no consensus in the scientific community on whether or not viruses are living organisms
Answering this question is not trivial since there is no consensus in the scientific community on whether viruses are living organisms or not.. Sometimes they are spoken of as structures on the edge of life. But let's go to what they are for sure: infectious agents that need a living organism to multiply, that is, parasites. Gather information from this link: virus under light microscope
They are not cells but they infect all kinds of living organisms: animals, plants, fungi, bacteria and protozoa, they have even been found parasitizing other viruses!
They are so small - an average of 100 nanometers or what is the same, a thousandth of the thickness of a hair - that they cannot be observed with the optical microscope, only when the electronic microscope was invented in 1931, which is capable of seeing objects tiny, we could have a picture of them.
Observing viruses extracted from an infected organism under an electron microscope, it was possible to verify that multiple particles appeared. Each of these viral particles was extraordinarily simple, made up of a covering made of protein and called a capsid inside which the genetic material that can be DNA or RNA is protected. In some types of viruses, the particles also have a lipid envelope, that is, formed by what we normally call fats, which steal from the membranes of the cells they infect.
1) The influenza virus binds to a target epithelial cell.
2) The cell gobbles up the virus by endocytosis.
3) The virus content is released. Viral RNA is introduced into the nucleus, where it is replicated by the RNA polymerase.
4) The virus's messenger RNA (mRNA) is used to make viral proteins.
5) New viral particles are manufactured and released into the extracellular fluid. The cell, which does not die in the process, continues to make new viruses.
A virus can exist as an individual entity but as soon as it enters a living organism, if it is competent to multiply, or as biologists say to replicate, it will do so in no time creating multiple copies of itself. So when in science we refer to a virus that infects an organism, we are not talking about just one of those particles, but a population of particles.
On whether or not they are immortal the answer is not obvious. To be mortal - or immortal in this case - an organism must first be alive and, as I said before, it is not entirely clear that viruses are.
It is true that viruses have a genetic structure, evolve by natural selection and reproduce by creating replicas, although not identical, of themselves but are not composed of cells and, according to cell theory, these are the basic structures of life so without them a virus could not be considered to be a living being.
There is one more argument against considering them living beings, viruses do not have their own metabolism, they need the cells of the organisms they infect to replicate.
But let us return to the initial question. A virus particle has a very short existence outside a living being but when it enters a host it begins to replicate at a very strong rate. We know, for example, that in an individual infected with the HIV or hepatitis C virus there may be between 10 billion and 100 billion viruses.
Their half-life is 6 to 24 hours, but because they replicate so quickly, these huge populations are in continual renewal. And that means that we are never talking about a single virus but rather balanced virus populations known in virology as viral quasi-species.
So the answer to the question of whether they are immortal is that if we are talking about a single virus or virus particle, of course it is not immortal, it is clearly gone.
HOW DO I KNOW IF MY TIRES ARE STILL GOOD? HOW TO MEASURE THE WEAR OF A TIRE?
The same question is repeated every time I change tires. ARE MY TIRES STILL GOOD? You always trust your mechanic, but this year you would like to make sure yourself. Here is some advice to evaluate the wear of your tires. To get more tips on how to choose new tires for your car please check out the best tires for subaru outback here.
Standards to be respected
In Quebec, the SAAQ asks to change any tire whose tread reaches a thickness less than 1.6 mm (2/32 of an inch). This measure is the point of no return after passing this mark, it becomes dangerous to use your tires since their grip is greatly affected. On the other hand, the SAAQ indicates that a tire begins to lose its grip when the thickness of the tread is less than 4.6mm (6/32 of an inch). This does not mean that your tires are no longer good from this measurement, but rather that the deterioration starts from this point.
How to measure tread wear
The simplest method of calculating wear is by using one of these small tools.
This small gauge is very easy to use. Simply push the black tabs on the tread and slide the metal rod deeper into the tire. When all this is done, you can read on the top part the measurement in millimeters or inches. This measurement tool is available in almost all parts retailers in Quebec, or online.
There are other methods, however, to calculate the wear on your tires. For example, your tires are equipped with a wear indicator that is located in the tread of your tire. Here is an example:
If the tread is made flat with the indicator, this means that your tire is returned to wear of 1.6 mm (2/32 inch) and that it is now time to change them.
If you have no tools at home, you can still use the famous 25 cents test. Just insert the piece into the scratch, the front of the caribou first towards the bottom of the tire. If you see the muzzle of the caribou, it means that your tire is less than 6/32 inch (4.6mm) thick and you have to start looking for new tires for the next season.
Some little tips
It is important to always take the wear of your 4 tires. Uneven wear can be a sign of misalignment or parts to replace.
The rotation of the tires allows a more uniform wear. Braking mainly wears the front wheels while traction or propulsion wears the wheel which transmits the rolling on the road.
Make sure you always have adequate pressure in your tires. Adequate pressure equals adequate bearing, which gives you minimal and even wear on your tires. In addition, good pressure could save you fuel in the long run.