Unit 1 Ch. 3 Reading Response

Toria redig

I learned something new today. I didnt know what an electon microscope was before.

Jessica Lewis is so smart and beautiful.

and Jamie is the smartest person I know. She helps me with chemistry

The electron microscope was constructed in by German enginers named Ernst Ruska and Max Knoll. This magnified and object by 400 times. This uses a beam of electrons to help magnify an oblect and to light up the object. Within the decade, the Manfred von Ardenne pioneered the scanning electron microscope. It has been developed by Professor Sir Charles Oatley. It can magnify any where from 10-500,000 times. It's energy is focused through one or two condensed lenses. It can spot something from 0.4 nm (nanometers) to 5 nm in diameter.

The carbon was bound to the calcium in limestone. The atom of carbon was sperated from the limestone's calcium by heat. It changed into a gas and was inhaled by a falcon, but not absorbed into its blood stream. It was exhaled as CO2 because it was combined with oxygen. It then was dissolved three times in the sea then expelled into the air.It then penetrated a leaf and the sun shone on it. The element collided with other molecules of nitrogen and oxygen adhering to a large molecute. IT then recieved light and seperated from the oxygen and combined with the hydrogen.

Nuclear medicine uses radioactive tracers to stabilize the nucleus by spontaneously emitting energy and particles. These radioactive partcles, also known as isotopes, are injected into the organs. This helps them study the organs for diseases that they may have.

The electron microsope was built by Ernst Ruska and Max Knoll which were German engineers. the design is always updated by others. It uses a particle beam of electrons to create a highly magnified image and to illuminate specimen. It magnifies greater. this one magnifies up to 10000 when others magnifiy only to 1000 times. Some permits scientsists to see images at an atomic level.  A high energy beam reads the object in 3d form.

Nuclear medicine uses radioactive tracers to pick up images while traveling through the organs. It emits energy and particles that stabilize the nucleus in order to get the best diagnosis of the disease. This advancement in medicine is making it a lot easier to figure out how to cure the many diseases out there.

The first electron microscope prototype was built in 1931. However, the first practical electron microscope was built in 1938.The microscope uses a beam of electrons to reveal the chemicals. The tunneling must be thin, in order to focus the beam. 
They have been refined since then but the basic design is still the same. The scanning tunneling microscope is a type of electron microscope that shows three-dimensional images of a sample.The texture, structure,reactivity, and size can be recorded. By becoming more familiar with those  certain particles, knowledge can expand on many different subjects.

Nuclear Medicine is a study of medicine that exploits radioactivity to diagnose certain diseases more accurately. Particles that are radioactivly charged are injected into an organ or body, these particles are called isotopes. These isotopes emit enough radiation to create an image that certain cameras can capture. The radiation can give a different and accurate picture of an organ and what might be wrong with it thus, diagnosing a problem with accuracy.

The first prototype of an electron microscope was made in 1931 by German Engineers Ernst Ruska and Max Knoll. In 1839, the University of Toronto constructed the first practical electron microscope. Even today, the electron microscopes are based off of Ruska's first prototype. Biological materials (such as microorganisms and cells), a variety of large molecules, medical biopsy samples, metals and crystalline structures and the characteristics of various surfaces are some of the things examined by researchers with this microscope. Extensive for inspection, quality assurance and failure analysis applications in industry, including, in particular, and semiconductor device fabrication are other uses for the elctron microscope. The scanning tunneling microscope is significant because it allows scientists to observe surface images at an atomic level.

Doctors can inject patients with a radioactive element and use a special camera to take pictures of the internal workings of the organ. They use bone scans which can detect cancer 6 to 18 months sooner than x-rays can

"Trace the development of the electron microscope and cite some of its many uses. Be sure to talk about why the scanning tunneling microscope is so significant."

    First of all an electron microscope is "a microscope that is similar in purpose to a light microscope but achieves much greater resolving power by using a parallel beam of electrons to illuminate the object instead of a beam of light" (http://wordnetweb.princeton.edu/perl/webwn?s=electron%20microscope). The first prototype of this microscope was built in 1931 by two German engineers.This prototype only magnified things up to 400x. Two years later the engineers made a microscope that exceeded the resolution of a regular microscope. In 1937 Reinhold Rudenburg, the scientific director of Siemens, started to fund the German engineers so he could see virus particle. Then in 1939 a practical one was built at the University of Toronto. From here electron microscopes were built better with more magnification and today they can get up to two million times magnification. This microscope is used for viewing various types of bacteria and viruses as well as insects and such.
   
    The scanning tunneling microscope is used for viewing things at the atomic level. "It provides a three-dimensional profile of the surface which is very useful for characterizing surface roughness, observing surface defects, and determining the size and conformation of molecules and aggregates on the surface"    (http://physics.nist.gov/GenInt/STM/text.html)

trace the development of the electron microscope and site some of its many uses. be sure to talk about why the scanning tunneling microscope is so significant.

The Electron Microscope was first developed in 1931 and was used to magnify things that are extremely small. However, in 1938 the first practical microscope was developed. They have much more power than light microscopes and can magnify things up to 1 million times. it uses electrostatic and electromagnetic in creating the image. There are 5 different types of an Electron Microscope: Transmission electron microscope, Scanning Electron microscope, reflection electron microscope, Scanning Transmission Electron microscope, and the Low Voltage electron microscope. The Scanning Tunneling Microscope is significant because it provides a clear image of an electron in a number of environments; including, air, water, gas, many liquids, and in many different temperatures.

I like the way Corrie describes the Electron microscope with so much detail.

I agree with therickster when he says that the scanning tunneling microscope is important because it demonstrates quantum tunneling.