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In cell biology, the cytoplasm describes all material within a eukaryotic cell, enclosed by the cell membrane, except for the cell nucleus. The material inside the nucleus and contained within the nuclear membrane is termed the nucleoplasm .
He also recognized the importance of the cell nucleus, discovered in 1831 by the Scottish botanist Robert Brown, [6] and sensed its connection with cell division. In 1838, the two scientists M. J. Schleiden and Theodore Schwann formulated a theory about cellular structure which stated, 'All the living organisms are made up of cells and the cell ...
Cells were discovered by Robert Hooke in 1665, ... The nucleus is spherical and separated from the cytoplasm by a double membrane called the nuclear envelope, space ...
Purkyně discovered sweat glands in 1833 and published a thesis that recognised 9 principal configuration groups of fingerprints in 1823. [6] [7] Purkyně was also the first to describe and illustrate in 1838 the intracytoplasmic pigment neuromelanin in the substantia nigra. [8]
Gregor Johann Mendel OSA (/ ˈ m ɛ n d əl /; Czech: Řehoř Jan Mendel; [2] 20 July 1822 [3] – 6 January 1884) was an Austrian [4] [5] biologist, meteorologist, [6] mathematician, Augustinian friar and abbot of St. Thomas' Abbey in Brno (Brünn), Margraviate of Moravia.
1930s–1950s: Joachim Hämmerling conducted experiments with Acetabularia in which he began to distinguish the contributions of the nucleus and the cytoplasm substances (later discovered to be DNA and mRNA, respectively) to cell morphogenesis and development. [18] [19]
Many years later, in 1831, Robert Brown discovered the nucleus. ... an exclusion membrane incorporates a section of the cytoplasm, generating the autophagosome, a ...
The cell was first discovered by Robert Hooke in 1665, which can be found to be described in his book Micrographia. In this book, he gave 60 observations in detail of various objects under a coarse, compound microscope. One observation was from very thin slices of bottle cork. Hooke discovered a multitude of tiny pores that he named "cells".