CELL THEORY/ CELL BIOLOGY / SCHWANN/ Robert Hooke/Anton van Leeuwenhoek
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Robert Hooke (1665) for the
Robert Hooke (1665) for the first time observed the honeycomb-like cells in a thin slice of cork under his microscope.
He coined the term “cell” which is derived from the Latin word cella meaning small room.
Since cork is dead, Hooke has observed only the cell walls not the living cell.
He published a book “Micrographia” in 1665 which is devoted to the microscopical observations.
Anton van Leeuwenhoek (1673) observed the living cells which he called animalcules from a scum of fresh water.
In 1881, Theodor Schwann and Matthias Jakob Schleiden proposed the cell theory. According the cell theory
All living organisms, whether unicellular or multicellular, are made up of a cell.
Cell is the structural and functional unit of life.
New cell arises only from the pre-existing cell/s.
Before this, it was believed that the new cell arises spontaneously from non-living things (theory of spontaneous generation).
The third postulate was added to the cell theory following the observation of dividing cells by Rudolf Virchow (1858). He coined the phrase “Omnis cellula e cellula”
All living cells are characterised by the presence of nucleus which was first recognised by Robert Brown (1831). In addition to the nucleus, cell consists of protoplasm (the term coined by Purkinje, 1839). The term protoplasm was later replaced by cytoplasm (term coined by Kolliker) and wall or simple membrane. The mitochondria was coined by Carl Benda while the term Golgi complex came from Camillo Golgi who discovered it.
The terms chromatin and mitosis were coined by Walther Flemming while the chromosome was coined by Wilhelm Waldeyer.
Golgi proposed Black reaction in which silver nitrate is allowed to react with brain tissue hardened in potassium dichromate. The product formed by the reaction i.e. silver chromate stains nerves black leaving other cells intact.
The term protoplasm was coined by Purkinje (1839) to the embryonic substance of animals. It is called “physical basis of life” by T. H. Huxley.
Overton (1895) documented the presence of cell membrane in animals by studying the plasmolysis with cane sugar. He even recorded free diffusion of fat soluble materials through membranes as compared with water soluble materials.
#celltheory
#SchwannandSchledien
#cellbiology
He coined the term “cell” which is derived from the Latin word cella meaning small room.
Since cork is dead, Hooke has observed only the cell walls not the living cell.
He published a book “Micrographia” in 1665 which is devoted to the microscopical observations.
Anton van Leeuwenhoek (1673) observed the living cells which he called animalcules from a scum of fresh water.
In 1881, Theodor Schwann and Matthias Jakob Schleiden proposed the cell theory. According the cell theory
All living organisms, whether unicellular or multicellular, are made up of a cell.
Cell is the structural and functional unit of life.
New cell arises only from the pre-existing cell/s.
Before this, it was believed that the new cell arises spontaneously from non-living things (theory of spontaneous generation).
The third postulate was added to the cell theory following the observation of dividing cells by Rudolf Virchow (1858). He coined the phrase “Omnis cellula e cellula”
All living cells are characterised by the presence of nucleus which was first recognised by Robert Brown (1831). In addition to the nucleus, cell consists of protoplasm (the term coined by Purkinje, 1839). The term protoplasm was later replaced by cytoplasm (term coined by Kolliker) and wall or simple membrane. The mitochondria was coined by Carl Benda while the term Golgi complex came from Camillo Golgi who discovered it.
The terms chromatin and mitosis were coined by Walther Flemming while the chromosome was coined by Wilhelm Waldeyer.
Golgi proposed Black reaction in which silver nitrate is allowed to react with brain tissue hardened in potassium dichromate. The product formed by the reaction i.e. silver chromate stains nerves black leaving other cells intact.
The term protoplasm was coined by Purkinje (1839) to the embryonic substance of animals. It is called “physical basis of life” by T. H. Huxley.
Overton (1895) documented the presence of cell membrane in animals by studying the plasmolysis with cane sugar. He even recorded free diffusion of fat soluble materials through membranes as compared with water soluble materials.
#celltheory
#SchwannandSchledien
#cellbiology
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