Chapter 2 MICROSCOPY Flashcards
are tools used to enlarge images of small objects
process of using microscope in investigating or studying microorganism
Microscope
Microscopy
very first magnifiers, 1000 BC, using blow glasa globes with ___ to magnify things
Water
___ are made of curved, ckear pieces of glass or plastic called lenses
All light rays lassing through the lens bend toward a point called the ___
Magnifiers
Focus
1590, ____ and _____ ____ from Holland have developed the compound microscope. They were just ordinary lens makers.
Johannes and Zacharias Janssen
1624, Italian astronomer Galileo Galilei develop the
microscope and telescope
1656, German mathematician Kircher made a microscope in which he saw “small worms” when he studies ___
Plaque
1661, Italian physician ____ was the first to use microscope in his anatomical studies. Showed trachea (windpipe) leads to two bronchi.
Marcelo Malphigi
1674, Dutch merchant and microscopist Anton van Leeuwenhoek devised microscope with a magnification of 200-300x. Observed moving organisms, animalcules. He was considered to open door to
“invisible world of microorganisms.
Majority of microscope are called _____
Light (bright field) microscopes
- Also referred to as a biological or research microscope
- Refer to as a high power microscope
- Mag. 40x-1000x, some up to 1500x or 2000x
- Image seen as if 10” (250mm) from observer
- 2-D, reversed and upside down
- light method is trans-illumination (light projectes from below)
Compound microscope
- found at top where you look through
- us. 10x, 12x, 15x mag. power
Eyepiece
Connects eyepiece lens to the objective lens
Tube
Supports the tube and connects it to the base. It is used along with the base in carrying microscope.
Arm
The bottom of the microacope. Used to support the entire microscope
Base
A steady light source used in place a mirror
Illuminator
A flat platform where you place the slide.
Holds the slide in place, used along with this.
Stage
Stage clips
The parts that holds two or more objectives. It can be rotate to change the magnification easily.
Revolving nosepiece/ Turret
Almost always consist of 4x, 10x, 40x and 100x powers
Short lens - lowest power
Longest lens - greatest power
Objective lenses
An adjustment fhat determines how close the objwctive lens can get to the slide
Rack stop
Is used to vary the intensity and size of the cone of light that is projected upward into the slide
Diaphragm
Focus the microscope, used only with LPO
Coarse adjustment knob
Focus the microscope, used with HPO to bring the specimen into better focus
Fine adjustment knob
- Also referred to as dissecting, dissection, or inspection microscopes
- Refer to as a low-power microscope
- 3D, upright and normal image
Stereo microscope
- uses a beam of accelerated electrons as a source of illumination
- having a high resolution of images
- magnify objects in nanometres
- Ernst Ruska
Electron Microscope