Walther flemming biography samples

  • A decade after Miescher's discovery, the German cytologist Walther Flemming (1843-1905) used aniline to stain cells and identified a structure.
  • The document summarizes key discoveries and individuals in cytogenetics: Walther Flemming published the first illustrations of human chromosomes in 1882.
  • Walther Flemming An Austrian cytologist and professor of anatomy, who published the first illustrations of human chromosomes in 1882.

    • •

    Pierre-Louis Maupertuis (1698–1759)

    Source: Wikipedia

    Pierre Louis Moreau de Maupertuis was a French mathematician, philosopher and man of letters. He became the Director of the Académie des Sciences, and the first President of the Prussian Academy of Science, at the invitation of Frederick the Great. His work in natural history is interesting in relation to modern science, since he touched on aspects of heredity and the struggle for life. Some historians of science point to his work in biology as a significant precursor to the development of evolutionary theory, specifically the theory of natural selection. Other writers contend that his remarks are cursory, vague, or incidental to that particular argument. Mayr's verdict was "He was neither an evolutionist, nor one of the founders of the theory of natural selection [but] he was one of the pioneers of genetics". Maupertuis espoused a theory of pangenesis, postulating particles from both mother and father as res

  • walther flemming biography samples

    • •

    Cell Division I: The cell cycle

    Did you know that every kroppsdel and tissue in your body was formed as the result of individual cells making copies of their DNA and separating themselves into two identical cells? From experiments in the 1870s to research more than 100 years later, scientists have made fascinating discoveries about the complex series of events that allow the cells in plants and animals, including humans, to grow and sustain life.

    • Most of the cells that make up higher organisms, like vertebrate animals and flowering plants, reproduce via a process called cell division.

    • In fängelse division, a cell makes a copy of its DNA and then separates itself into two identical cells – each with its own copy of DNA enveloped inside a nucleus.

    • The begrepp mitosis refers specifically to the process whereby the nucleus of the parent cell splits into two identical nuclei prior to cell division.

    cell
    the basic structural unit of all living things
    eukaryotes
    advance

    •

    HI! You want to look at cells. You get a sample and you stain the cells with a dye. Which label is pointing to the nucleus? A: That is correct. B: No, this label points to the cell membrane. C: No, this label points to the inside of the cell. None of the labels point to the nucleus. No, one of these labels does point to the nucleus. The nucleus is the dark staining body in the cell. Your friend uses the same kind of cells but she decides to use a different dye. This is what she sees. Are these dark staining bodies nuclei? Yes. No, these are not nuclei. Each cell only has one nucleus. No. That is correct. Your friend used a different dye on this cell. The stained bodies are inconsistent; some cells have more, some have less. Your friend is staining something other than the cell nuclei. You both decide to stain more cells. You and your friend use both dyes on the same cell type. This is what you see with the double staining. The nucleus of each cell stains like it did before. The t