topic 1 Flashcards
Who is Hans and Zacharias Janseen
The invented the first ever compound microscope
Who is Robert Hooke
He added a third lens the microscope and a light to illuminate objects to the janseen brothers microscope
Who is Van Leuwenhoek
He has the best microscope and was the first person to see the movement of living single cell organisms because he could see up to 250X bigger
What is the three laws of cell theory
All living cells made up of one or more cells, cells are the smallest unit of life. and all cells a produced from pre existing cells
Who is Francisco Redi
had three jars on sealed, unsealed and one with a gauze, he wanted to show that maggots dont grow out of meat
Who is John Needham
with his experiment he tried to prove existence of life forces by using flasks having brothh and heating it up then sealing and organisms grew making him try to show that spontaneous generation is true
Who is Lazzaro Spallanzani
Did Johns experiment but differently by having it in a vacuum but then as a result got no growth
Who is Louis Pasteur
did the same experiment as both Lazzaro and John but this time did not seal the flask and ending up with no bacteria present
Define Magnification
magnification is too see things bigger when they are really small
Define Resolution
How much more or less clearly you can see the magnified object
Define Contrast
Contrast is the variation shadow and to register depth
Difference between light and electron microscopes
Electron microscopes use an electro gun for its source, electro beam for radiation, electromagnet for its lenses, digital image for the receiver and a magnetic field for its focus.
Light microscopes uses light for its source and a visible light for its radiation, the lenses are curved and is a compound microscope, and the receiver is our eyes, focus is the movement of the lenses
who is Robert Brown
he was the person who discovered what a nucleus is
who is Schleiden and Schwann
Schleiden found out that plants were mad out of cells and Schwann found out animals were made out of cells both describing cells as the basic unit of life
who is Rudolf Virchow
found out all cells come from other existing cells
