Essays Tagged: "Electron microscope"

"Electron Microscopes" - Electron Microscopes (EMs) are scientific instruments that use a ray of electrons to examine small matter on a very fine scale.

Electron MicroscopesElectron Microscopes (EMs) are scientific instruments that use a ray of electron ... mposed of.*Crystallographic Information; this is how the atoms are arranged in the matter.Where did Electron Microscopes Originate from?Electron Microscopes were invented because of the limitations of ... cientists named Max Knoll and Ernst Ruska from Germany in 1930, decided to develop The Transmission Electron Microscope (TEM) as there was a greater desire to see finer details of interior structures. ...

(3 pages) 49 3 4.8 Oct/2003

Subjects: Science Essays > Biology

Cells (note, these are notes for Ch. 4 in Modern Biology text)

l2. the cell is the basic unit of organization of organisms3. all cells come from pre-existing cellselectron microscope= uses a beam of electrons rather than light; can magnify 500,000 times. used to ...

(1 pages) 39 0 1.0 Apr/2004

Subjects: Science Essays > Biology

Outline of Leprosy

7 micro-millimeters in length and 0.3-0.4 micro-millimeters in width. It can only be seen under the electron microscope when stained. It is acid-fast and alcohol-fast, meaning not decolorized by acid ... extra-cellular masses, known as globi, consist of clumps of bacilli in capsular material. Under the electron microscope, the bacillus appears to have a great mixture of forms. The most common is a sli ...

(4 pages) 72 0 4.6 Apr/2004

Subjects: Science Essays > Biology > Human Biology

The Most Useful (or Important) Scientific Invention

d far better resolutions, so specimens examined had a sharper image. The latest improvement was the electron microscope, which uses electron beams instead of lamps or mirrors reflecting light like the ... ate between two cells, due to the presence or absence of contents they are supposed to contain. The electron microscope is usually used in such cases as it can magnify the internal structures of a cel ...

(2 pages) 45 2 4.2 May/2004

Subjects: Humanities Essays

Study guide chapter 8 for AP Bio (Biology by Campbell and Reece)

n the water and their was no bilayer.2. When the halves of the fractured membrane are viewed in the electron microscope, the interior of the bilayer looks cobblestoned, with protein particles wedged i ...

(4 pages) 39 0 4.3 Oct/2004

Subjects: Science Essays > Biology

Notes on Cell Structures

acts)-projected into eye, film, video screenCell ultrastructure- a cell's anatomy as revealed by an electron microscopeEMs have shorter wavelengths than the wavelengths of visible lightScanningEM- sur ... oated with a film of gold, topography of the specimen, depth of field, 3-DTransmissionEM- internal, electron beam through specimen, electromagnets used to magnify and focusResolution- measure of the c ...

(7 pages) 84 0 4.2 Oct/2004

Subjects: Science Essays > Biology

Light Microscope and Electron Microscopes

dot; The wavelength of light (min. - violet is 400nm) is much larger than the wavelength of electrons, so the resolution of the light microscope is a lot lower.· The actual reso ... or lighter, thus enhancing contrast and giving an almost three dimensional appearance.Transmission Electron MicroscopyThis type of microscopy uses an electron beam instead of light to visualise biolo ...

(4 pages) 32 0 0.0 Mar/2005

Subjects: Science Essays > Biology

The Microscope: Science's Greatest Invention?

lmost 1000 times smaller that what the eye can see, like plant, animal, and bacteria cells, and the electron microscope allows us to see things almost 1,000,000 times smaller, like viruses and protein ... oped by Richard Zsigmondy which could study objects under the wavelength of light, and in 1938, the electron microscope was developed by Ernst Ruska which greatly improved the resolution and magnifica ...

(3 pages) 38 0 5.0 Apr/2006

Subjects: Science Essays > Technology


ing organisms. They are so small that they cannot be seen under a light microscope. One requires an electron microscope to see them. HIV causes reduction of body's capability to fight against various ...

(3 pages) 45 1 3.6 Apr/2007

Subjects: Humanities Essays > Health & Medicine > Diseases

Cell Organelles

types of ER: rough ER and smooth ER•Rough ER is studded with tiny granules easily seen with an electron microscope. These are called ribosomes, and they play an important role in the synthesis of ...

(3 pages) 13 0 1.0 Feb/2008

Subjects: Science Essays > Biology

Emily Dickson and Charles Wright

source of information, guidance and inspiration. Wright suggest that "[Dickinson's] poetry [is] an electron microscope trained on the infinite and the idea of God…. Her poems are immense voyag ...

(6 pages) 13 0 4.3 Feb/2009

Subjects: Literature Research Papers > Creative Writing > Poems & Short Stories

Impact of Light and Electron Microscope on Cell Theory

cells organelles such as Robert Brown and his discovery of the cell nucleus.The introduction of the electron microscope in the 1930s also had a large impact on the study of cells. An electron fires a ... ed to illuminate the specimen and enable viewing on a fluorescent screen or photographic plate. The electron microscope enabled scientists to view cells at a much larger magnification at a higher reso ...

(2 pages) 10309 0 0.0 Mar/2009

Subjects: Science Essays > Biology