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Joachim Hammerling ( You know like a Hammer)
Transcript of Joachim Hammerling ( You know like a Hammer)
Consists of 3 parts
3) Cap Region Removed caps from acetabularia
Acetabularia regenerated new caps
Grew again from the stalk Removed foot from acetabularia
Acetabularia did not regenerate from the cap
Foot did not regenerate Nucleus located in foot of acetabularia Hammerling conclusions strongly suggested that DNA was located in nucleus of acetabularia and possibly in all organisms
Proof: Acetabuarlia only grew from the foot, where nucleus was located 1943 BREAKTHROUGH Determined the role of nucleus
Removed nucleus from crenulata (species of acetabularia)
Grafted nucleus onto mediterranea (another species of acetabularia)
Mediterranea regenerated crenulata characteristics
Indicated that nucleus contained DNA Friedrich Miescher ( late 1860s) Friederick Griffith (1920s) Oswald Avery,
Maclyn McCarty and
Colin Macleod (1944) Erwin Chargaff(1949) Alfred Hershey and Martha Chase (1952) Rosalind Franklin (1953) James Watson and Francis Crick (1953) Friedrich Miescher Joachim Hammerling Friederick Griffith Oswald Avery Maclyn McCarty Colin Mcleod Erwin Chargaff Alfred Hershey Martha Chase Rosalind Franklin James Watson Francis Crick Biography: Birth name Joachim August Wilhelm Hammerling
DOB:1901 March 9 in Berlin
DOD:1980 August 1980
was of Danish - German descent Discoveries Education was educated at the Univeristy of Berlin and University of Marburg.
1924-1931 he was a research assistant for Biology
1931-1940 he moved on to becoming a lecturer
1940 became a director of the German-italian Institute of Marine Biology Hammerling began to grow in acetabularia in his laboratories Acetabularia What is Acetabularia you may wonder? Its a genus of green algae
Typically found in subtropical waters
known as one of the largest single celled organisms
big structure and complex therefore preferred model to study in biology
1.round leaves/2.bottom rizhoid/3.long stock middle/4.top umbrella
The nucleus is located in the rhizoid He discovered that acetabularia only had one cell nucleus which was located in the rhizoid
with the understanding of plant cells he then conducted further research on the correlation between nucleus and development
this resulted in the 1943 breakthrough 1943 Breakthrough!! Joachim took the nucleus of a special speciesof an acetabularia plant called crenulata with some properties removed. He then inserted that nucleus into another species called Mediterranea.
The end result:
The new species had regenerated without the removed properties. Hypothesis: Hereditary information is stored in the nucleus Timeline of DNA Structure research Final Conclusion: Nucleus in the foot of acetabularia was responsible for regeneration
Nucleus was responsible for holding hereditary information