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Animal Classification
Approximately 384 B.C.- Was known for his experimental approach and numerous dissections. He was drawn to animal classification in order to discover aspects of connection between the soul and the human body. Some of his animal classifications still stand today -
Jansen Microscope Sees Cells
Jansen invented the first basic microscope. without this invention, people would have never seen cells -
Spontaneous Generation
Jan Baptist van Helmont was an early modern period Flemish chemist, physiologist, and physician. He worked during the years just after Paracelsus and iatrochemistry, and is sometimes considered to be "the founder of pneumatic chemistry". Van Helmont is remembered today largely for his ideas on spontaneous generation, his 5-year tree experiment, and his introduction of the word "gas" into the vocabulary of scientists. -
Tissue Interpret
Rudolf Albert von Kölliker, Swiss embryologist and histologist, one of the first to interpret tissue structure in terms of cellular elements -
Publishing of Micrographia
In 1665 Hooke published Micrographia, a book describing his microscopic and telescopic observations, and some original work in biology. Hooke coined the term cell for describing biological organisms, the term being suggested by the resemblance of plant cells to monks' cells -
First to Observe Bacreria and Protozoa
Dutch microscopist who was the first to observe bacteria and protozoa. As a hobby, Leeuwenhoek began grinding lenses and using them to study minute objects, particularly small organisms. -
Discription of A Cells Nucleus
Robert Brown was a Scottish botanist and palaeobotanist who made important contributions to botany largely through his pioneering use of the microscope. His contributions include one of the earliest detailed descriptions of the cell nucleus and cytoplasmic streaming; the first observation of Brownian motion; early work on plant pollination and fertilisation, including being the first to recognise the fundamental difference between gymnosperms an -
New System of Animal Classification
Lorenz Oken came up with a new system of animal classification that demonstrated the path of evolution including: Dermatozoa- invertabrates Glossozoa- fish with the first toungues Rhinozoa- reptiles inwhich the nose opens into the mouth and us used for respiration Otozoa- birds with the first externally open ears Ophthalmozoa- mammals including all sensory organs -
Discovery of Schwann Cells
Contributed the development of cell theory, the discovery of Schwann cells in the peripheral nervous system, the discovery and study of pepsin, the discovery of the organic nature of yeast, and the invention of the term metabolism. He also stated that "All living things are composed of cells and cell products." And he proved the cellular origin and development of the most highly differentiated tissues including nails, feathers, and tooth enamel. -
Study of Plant Structure
Schleiden preferred to study plant structure under the microscope. While a professor of botany at the University of Jena, he wrote Contributions to Phytogenesis (1838), in which he stated that the different parts of the plant organism are composed of cells. Thus, Schleiden and Theodor Schwann became the first to formulate what was then an informal belief as a principle of biology -
Recognization of Leukemia
Most widely known scientific contribution is his cell theory, which built on the work of Theodor Schwann. He is cited as the first to recognize leukemia cells. He was one of the first to accept and plagiarize the work of Robert Remak who showed that the origins of cells was the division of preexisting cells. -
Germ Theory
Pasteur came up with a process to prevent milk and wine from making people sick (Pasteurization) which was based off his work in germ theory. He had proven spontaneous generation false and replaced it biogenesis which states that all living things came from preexisting life. Biogenesis is the basis or Germ Theory which, though not originally his idea, led Pasteur to discover vaccines for Rabies and Anthrax as well as other medical accomplishments.
