microscope

Viewing a section of the spinal cord under the microscope, Cho was amazed to see that the spinal cord was completely dark.

I put our bullet under electron microscope magnification.

All you do is to train the microscope on tiny flecks of paint and analyze them.

Well, we put an infrared microscope - a spectroscope - on tiny tiny bits of paint.

I was so impressed with the way you handled the microscope and the samples of onion cells and, well, how careful you observed and diagramed and interpreted each stage of cell division, and I don’t think you could have done that if you hadn’t understood the chapter.

The size of a cell often determines the type of microscope a biologist uses to study it.

Thus, the light microscope remains a useful tool, especially for studying living cells.

For a biologist studying a living process, such as the whirling movement of a bacterium, a light microscope equipped with a video camera might be better than either a scanning electron microscope or a transmission electron microscope.

Nonetheless, they have not replaced the light microscope.

Electron microscopes have truly revolutionized the study of cells and cell organelles.

However, instead of lenses made of glass, the transmission electron microscope uses electromagnets as lenses, as do all electron microscopes.

Specimens are cut into extremely thin sections, and the transmission electron microscope aims an electron beam through a section, just as a light microscope aims a beam of light through a specimen.

The transmission electron microscope, on the other hands, is used to study the details of internal cell structure.

The scanning electron microscope produces images that look three-dimensional.

Biologists use the scanning electron microscope to study the detailed architecture of cell surfaces.

Only under special conditions can electron microscopes detect individual atoms.

In fact, the most powerful modern electron microscopes can distinguish objects as small as 0.2 nanometers, a thousandfold improvement over the light microscope.

Instead of light, the electron microscope uses a beam of electrons and has a much higher resolving power than the light microscope.

Our knowledge of cell structure took a giant leap forward as biologists began using the electron microscope in the 1950s.

From the year 1665, whenEnglish microscopist Robert Hooke discovered cells, until the middle of thetwentieth century, biologists had only light microscopes for viewing cells.

The light microscope cannot resolve detail finer than 0.2 micrometers, about the size of the smallest bacterium; consequently, no matter how many times its image of such a bacterium is magnified, the light microscope cannot show the details of the cell's internal structure.

Light microscopes can magnify objects up to1,000 times without causing blurriness.

Glass lenses in the microscope bend the lightto magnify the image of the specimen and project the image into the viewer'seye or onto photographic film.

The first microscopes were light microscopes, which work by passingvisible light through a specimen.

Before microscopes werefirst used in the seventeenth century, no one knew that living organisms werecomposed of cells.

And as microscopes improved, we discovered some microorganisms that were incredibly small.

But using the microscope we discovered that a fungus contains these microscopic thread-like cells that run all over the place.

A hundred years or so after the invention of the microscope, Carolus Linnaeus devised a simple and practical system for classifying living things, according to the ranks of categorization still in use today——class, order, family and so on.

With the invention of the microscope, in the late 1500s, we discovered the first microorganisms.

This system, organizing all life into these two kingdoms, worked very well for quite a while, even into the age of the microscope.

The media put their every decision under the microscope.

He ignored the question. I was the one under the microscope.