Pick one Neureobiology topic from list Essay Example | Topics and Well Written Essays - 1000 words

Pick one Neureobiology topic from heel - Essay ExampleThese are the simplest and oldest microscopes which use light along with powerful lenses to focus on a living or a dead sample placed onto a platform called the stage (refer to the send off above). The specimen (also called sample) is viewed using the eye piece.Before we move onto electron microscopy we must understand what exactly is meant by the term stoppage. Resolution is a measure of how detailed an image is. A picture with a spacious resolution is very clear. The problem with light microscopy is that the image (called micrograph) formed using a light microscope has a lower resolution i.e. it is less clear even at the highest magnification. Now the question is why resolution matters. It matters because the clarity of an image matters when viewing cells that have very small parts if the resolution is low and then two small parts can end up appearing as one mavin small part. Light microscopes have a limit of resolution of 200nm that is if any two objects are viewed using a light microscope and are closer than 200nm to each other than theycannot be viewed as separate objects and instead they get merged into a single object. The major difference between a light and an electron microscope is of resolution. Electron microscopes have a much greater resolution than light microscopes and as a answer the image (micrograph) obtained using an electron microscope is much clearer.These use a beam of electrons (very small negatively supercharged particles that are found in all substances) instead of light to examine the specimen. Electron microscopes were made in order to overcome the limitations of the light microscope. Electron microscopes provide much larger magnification and much clearer images of specimen being viewed. There are two types of electron microscopes1. Scanning electron microscope (SEM) designed after pondering light microscopes these are also using electrons beams but here the beam is use d for scanning the muster up or the boundary of