Lab 1
Roger Bacon first observed the magnifying properties of crystals in 1268, accidentally discovering that convex crystals could make distant objects appear closer and larger. This led to the development of the telescope and simple microscope with one lens. Over time, microscopes were improved with two lenses for better resolution and magnification, and different types were developed including light and electron microscopes. The invention of the microscope allowed humans to overcome limitations of the naked eye and view cells, leading to many new discoveries about their structure and function. Robert Hooke first used the term "cell" to describe the boxes he saw when viewing cork bark under an early microscope in 1665, though he did not understand cells' true nature. Antonie van Leeuwenhoek later
Lab 1
- 1. October 11, 2015 PRACTICAL CELL BIOLOGY LAB 1 Brief history of microscope discovery Roger Bacon in 1268. As he tried to improve the “burning glass,” he accidentally broken a crystal sphere and made several observations through it. He saw that if the convex side of the glass toward the eye, the far things can be seen closer and bigger, so this is very helpful for the person who had eye defect or to see a minute objects. Then telescope was invented which it is very important to distinct far things and in astronomy. After that the simple microscope which has one lens, and to better resolution and magnification, the microscope with two lenses invented. With the increasing idea, different types of microscope were available today around the world for example light microscope and electron microscope. One of the senses is sight. It aids in the process of gathering information. However, this visual gathering is adequate only to a certain point, so there is a mount of limitations. In order to overcome those limitations, humans started to develop instruments like the magnifying glass, telescope and the microscope, so with the invention of the microscope and its subsequent improvement, cells became visible and many new discoveries were made about them.
- 2. October 11, 2015 PRACTICAL CELL BIOLOGY LAB 1 Brief history of cell discovery Robert Hooke (1635-1703): used early microscopes to view cork tree bark and describe the word of cell which comes from cellula (lattin word means small storage room). Hooke did not know the real structure or function of the cell. His cell observations gave no indication of the nucleus and other organelles found in most living cells. Antonie van Leeuwenhoek (1632-1723) described cells in a drop of pond water using a microscopeand was the first personwho observed bacteria and protozoa. Some of his lenses could magnify objects 250X. Robert Brown:identified nuclei in plant cells. Theodor Schwann & Matthias Schleiden Principlesof cell theory - All living things are made of cells; organisms consist of one or more than one cells. - The smallest living unit of structure and function of all organisms is the cell. - All cells arise from preexisting cells ((this principle discarded the idea of spontaneous generation).