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Schwann was the first of Müller's pupils to break with vitalism and work towards a physico-chemical explanation of cells. Schwann also examined the question of [|spontaneous generation], which led to its eventual disproof. In the course of his experiments, he discovered the organic nature of [|yeast].
 * Theodor Schwann:**

Schwann concluded that all animals are made of cells and came up with the cell theory with Schleiden. Also a co-founder of the cell theory, Schwann discovered the discovery of the nature of yeast(above), also known as pepsin. Mathias jakob Schleiden was one of the first German biologists to accept Darwin’s theory of evolution. Born in [|Hamburg], Schleiden was educated at [|Heidelberg], then practiced law in Hamburg, but soon developed his love for the [|botany] into a full-time pursuit. Matthias Jakob Schleiden is a botanist and also a co-founder of the cell theory, that states that all organic (living) matter is made of at least one cell, he also discovered the wall of cells(cellulose) on plants. Schleiden observed various cell structures and activities such as protoplasmic streaming. Schleiden also found that certain fungi live on or within the roots of some plants. This relationship between fungi and plants, called mycorrhiza ("fungi roots"), has since been shown to be very common and extremely beneficial to both organisms
 * Matthias Jakob Schleiden:**

Read more: [|http://www.answers.com/topic/matthias-jakob-schleiden#ixzz1cYI7CycU]

Rudolf virchow is a founder of cellular pathology. Rudolf Virchow was born in Schivelbein, Russia He was a German physician who first time proposed the idea that new cells are formed only from the pre-existing cells.
 * Rudolf Virchow:**
 * Rudolph Ludwig Karl Virchow** (13 October 1821 – 5 September 1902) was a [|German doctor], [|anthropologist], [|pathologist], [|prehistorian], [|biologist] and [|politician], known for his advancement of [|public health]

Read more: [|http://wiki.answers.com/Q/What_was_the_contribution_of_Rudolf_Virchow#ixzz1cYIYEA21]