Microscopy

video 7'52 : https://youtu.be/mTzHxNMK0bU : Explore Leeuwenhoek's incredible discoveries in this New York Times' animated video. : https://www.nytimes.com/2014/09/16/opinion/animated-life-seeing-the-invisible.html

text : Enhancing the Microscope Image : https://www.cellsalive.com/enhance0.htm

cell membrane

video 2'58 : https://youtu.be/RT61MUjogRo : Structure of the Cell Membrane

video 1'26 : https://youtu.be/LKN5sq5dtW4 : Fluid Mosaic Model of the Cell Membrane