He became something of an inventor. Key Points. , In examining teeth, Schwann was the first to notice "cylindrical cells" connected to both the inner surface of the enamel and the pulp.  Schwann coined its name from the Greek word πέψις pepsis, meaning "digestion" (from πέπτειν peptein "to digest"). Pepsin was the first enzyme to be isolated from animal tissue. Dining with Schwann one day, their conversation turned on the nuclei of plant and animal cells. Theodor Schwann (1810-1822) and Matthias Schleiden (1804-1881) both of them have made their own discoveries and achievements but together they have made one very important discovery (1839): "The Theory of Cells". , Yeast, fermentation, and spontaneous generation. The cell is the unit of structure, physiology, and organization in living things. :56–57 Schwann was the first of Müller's pupils to work towards a physico-chemical explanation of life. Schleiden described plant cells and proposed a cell theory which he was certain was the key to plant anatomy and growth. :85–86 However, other authors regard this as misrepresenting his thinking, and reject the idea that Schwann went through an existential crisis or a mystical phase. Schwann remembered seeing similar structures in the cells of the notochord (as had been shown by Müller) and instantly realized the importance of connecting the two phenomena. cells that are independent and separate, e.g. He received a bachelor of philosophy in 1831. Theodor Schwann is one of the most reverenced scientists in history. , Schwann published his observations in 1838 in the Neue notisen geb.  This enabled him to establish the critical period in which the eggs needed oxygen. This varied significantly from previous theories that animals and plants had different compositions because of their extreme differences. nat.-heilk. The resemblance was confirmed without delay by both observers. First he controlled the temperature of fluid from fermenting beer in a closed vessel in the presence of oxygen. He retired fully in 1879. He spent considerable time perfecting experimental techniques and instruments for use in experiments. He was the person who found the organic nature of yeast and that how does it formed. Theodor Schwann, along with fellow scientist Matthias Schleiden, developed the cell theory, which is basically a description of the various parts and functions of plant and animal cells.  Schwann claimed that "there is one universal principle of development for the elementary parts of organisms, however different, and this principle is the formation of cells. This postulation still heavily influences the modern cellular theory that the cell is life in its simplest form and also that cells breed other cells to comprise living beings. , In his Microscopical researches, Schwann introduced the term "metabolism", which he first used in the German adjectival form "metabolische" to describe the chemical action of cells. The cell theory describes the basic properties of all cells. , In 1835, relatively little was known about digestive processes. Schwann was facing some theological issues in his final years of life but he did not lose hope and continued to study the cell biology until he died. , Schwann's theory and observations created a foundation for modern histology. He died in year of 1882 on January 11 in the age of almost 72 years. Many of his important contributions were made during the time that he worked with Müller in Berlin. In Cologne his religious instructor Wilhelm Smets [de], a priest and novelist, emphasized the individuality of the human soul and the importance of free will. As of 1872, he ceased to teach general anatomy, and as of 1877, embryology. 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