https://padlet.com/lamoona42/hirf3ptcp0f620dn The time line of the cell and the scientists who contributed to its discovery. en-us 2020-09-11 16:33:38 UTC 2024-06-07 20:21:10 UTC hello@padlet.com https://padlet-uploads.storage.googleapis.com/722109239/e228beee17f724445c126046a39abf2e/images.jpg lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739475980 The cell's discovery was made possible and fueled by the invention of the microscope.]]> 2020-09-11 16:40:09 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739475980 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739495984  The cell was first discovered and named by Robert Hooke in 1665. He remarked that it looked strangely similar to cellula or small rooms which monks inhabited, thus deriving the name. However what Hooke actually saw was the dead cell walls of plant cells (cork) as it appeared under the microscope ]]> 2020-09-11 16:44:06 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739495984 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739504388  The first man to witness a live cell under a microscope was Anton van Leeuwenhoek, who in 1674 described the algae Spirogyra. Van Leeuwenhoek probably also saw bacteria. ]]> 2020-09-11 16:45:48 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739504388 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739522738 In 1838, Theodor Schwann and Matthias Schleiden were enjoying after-dinner coffee and talking about their studies on cells. It has been suggested that when Schwann heard Schleiden describe plant cells with nuclei, he was struck by the similarity of these plant cells to cells he had observed in animal tissues. The two scientists went immediately to Schwann’s lab to look at his slides. Schwann published his book on animal and plant cells (Schwann 1839) the next year, a treatise devoid of acknowledgments of anyone else’s contribution, including that of Schleiden (1838). He summarized his observations into three conclusions about cells.]]> 2020-09-11 16:49:31 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739522738 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739530193 1833 – Brown descibed the cell nucleus in cells of the orchid. 


]]> 2020-09-11 16:50:58 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739530193 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739547558 1858 – Rudolf Virchow (physician, pathologist and anthropologist) expounds his famous conclusion: omnis cellula e cellula, that is cells develop only from existing cells [cells come from preexisting cells] ]]> 2020-09-11 16:54:27 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739547558 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739559471 1857 – Kolliker described mitochondria. ]]> 2020-09-11 16:56:58 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739559471 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739561874 1879 – Flemming described chromosome behavior during mitosis. ]]> 2020-09-11 16:57:30 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739561874 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739563761 1883 – Germ cells are haploid, chromosome theory of heredity. 

]]> 2020-09-11 16:57:54 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739563761 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739565327 1898 – Golgi described the golgi apparatus. ]]> 2020-09-11 16:58:13 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739565327 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739566437 1938 – Behrens used differential centrifugation to separate nuclei from cytoplasm. ]]> 2020-09-11 16:58:29 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739566437 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739569876 1939 – Siemens produced the first commercial transmission electron microscope. ]]> 2020-09-11 16:59:14 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739569876 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739572097 1952 – Gey and coworkers established a continuous human cell line. ]]> 2020-09-11 16:59:42 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739572097 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739573383 1955 – Eagle systematically defined the nutritional needs of animal cells in culture. ]]> 2020-09-11 16:59:59 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739573383 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739575299 1957 – Meselson, Stahl and Vinograd developed density gradient centrifugation in cesium chloride solutions for separating nucleic acids. ]]> 2020-09-11 17:00:24 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739575299 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739579614 1965 – Ham introduced a defined serum-free medium. Cambridge Instruments produced the first commercial scanning electron microscope. ]]> 2020-09-11 17:01:21 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739579614 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739581433 1965 – Ham introduced a defined serum-free medium. Cambridge Instruments produced the first commercial scanning electron microscope. ]]> 2020-09-11 17:01:41 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739581433 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739582261 1981 – Transgenic mice and fruit flies are produced. Mouse embryonic stem cell line established. 

]]> 2020-09-11 17:01:51 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739582261 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739583927 1995 – Tsien identifies mutant of GFP with enhanced spectral properties ]]> 2020-09-11 17:02:13 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739583927 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739585166 1998 – Mice are cloned from somatic cells. ]]> 2020-09-11 17:02:28 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739585166 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739586097 1999 – Hamilton and Baulcombe discover siRNA as part of post-transcriptional gene silencing (PTGS) in plants ]]> 2020-09-11 17:02:40 UTC https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739586097 lamoona42 https://padlet.com/lamoona42/hirf3ptcp0f620dn/wish/739586730

All known living things are made up of cells.

The cell is structural & functional unit of all living things.

All cells come from pre-existing cells by division. (Spontaneous Generation does not occur).

Cells contains hereditary information which is passed from cell to cell during cell division.

All cells are basically the same in chemical composition.

All energy flow (metabolism & biochemistry) of life occurs within cells.

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