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Protoplasm (/ ˈ p r oʊ t ə ˌ p l æ z əm /; [1] [2] pl. protoplasms) [3] is the part of a cell that is surrounded by a plasma membrane. It is a mixture of small molecules such as ions, monosaccharides , amino acids, and macromolecules such as proteins, polysaccharides, lipids, etc.
Purkyně is best known for his 1837 discovery of Purkinje cells, large neurons with many branching dendrites found in the cerebellum. He is also known for his discovery in 1839 of Purkinje fibres, the fibrous tissue that conducts electrical impulses from the atrioventricular node to all parts of the ventricles of the heart.
Uniting Félix Dujardin's conception of animal sarcode with Hugo von Mohl's of vegetable protoplasma, he pointed out their identity, and included them under the common name of protoplasm, defining the cell as a nucleated mass of protoplasm with or without a cell wall (Das Protoplasma der Rhizopoden und der Pflanzenzellen; ein Beiträg zur ...
In 1935, Karl Lohmann discovered ATP and its role as a source of energy for cells, so the concept of a metabolically-driven sodium pump was proposed. The tremendous success of Hodgkin , Huxley , and Katz in the development of the membrane theory of cellular membrane potentials , with differential equations that modeled the phenomena correctly ...
The process of cell division as observed under a microscope was first discovered by Hugo von Mohl in 1835 as he worked on green algae Cladophora glomerata. [ 3 ] Mohl's writings cover a period of forty-four years; the most notable of them were republished in 1845 in a volume entitled Vermischte Schriften (For lists of his works see Botanische ...
The issue was reprinted seven times and protoplasm became a household word; Punch added 'Professor Protoplasm' to his other soubriquets. The topic had been stimulated by Huxley seeing the cytoplasmic streaming in plant cells, which is indeed a sensational sight. For these audiences, Huxley's claim that this activity should not be explained by ...
A research team in New Jersey has discovered the remains of a steamship that went missing in 1856 off the coast of Massachusetts Skip to main content. 24/7 Help. For premium support please call ...
In a review of Seifriz' book, Protoplasm, E. O. Kraemer wrote, "Professor Seifriz is a versatile scientist. His work on emulsions, gels, and other colloid topics is well known among chemists and physicists, but they may not be aware that Professor Seifriz is a member of a botany department and is an active investigator in botany and biology.