Microscopes Flashcards
What is the magnification for an electron microscope?
Up to x 2 000 000 bigger
What is the magnification of a light microscope?
Up to x 2000 bigger
What did Robert Hooke do?
In 1665, Robert Hooke used his microscope to describe tiny box-shaped units in a thin slice of cork. He called these ‘cells’ - a term we still use today.
What did Anton van Leeuwenhoek do?
In 1670, he designed and constructed his own microscopes made of a small, single-mounted lens that was held up close to your eye. Using these, he was the first to observe unicellular micro-organisms.
What did Robert Brown do?
In 1831, he made microscopic observations of plant cells and identified a structure he called the nucleus.
What did Matthias Scheilden do?
In 1838, he proposed that all plants are made up of cells.
What did Theodor Schwann do?
In 1839, he proposed that all animals are made up of one or more cells, and that the cell is the basic unit of all living things.
What did Ernst Ruska do?
In 1933, he built the first electron microscope, which uses a beam of electrons and provides higher magnification and resolution than light microscopes.
What did Rudolf Virchow do?
In 1858, he proposed that all cells arise from cells that already exist.
What happened in 1937?
The first scanning electron microscope was built. These microscopes show images of cell surface features such as the blood cells shown opposite.
What did Marvin Minsky do?
In 1957, he invented the first confocal microscope, which became commercially available in the 1980s.
What did Gerd Binnig and Heinrich Roher do?
In 1981, they invented the scanning tunnelling microscope. This microscope can provide 3D images of objects at an atomic level.
Who built the first electron microscope?
Robert Hooke
What do electron microscopes use?
Use small particles called electrons.
What do light microscopes use?
Light microscopes use light rays.
