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The discovery of The Chloroplast Julius Von Sachs & Theodore Wilhelm Engelmann

The discovery of The Chloroplast Julius Von Sachs & Theodore Wilhelm Engelmann. By: Jan Villamor Anna- Maria Allen Amanda Brennan . Previous Knowledge. Phototropism Plants take in CO ₂ and produce O₂

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The discovery of The Chloroplast Julius Von Sachs & Theodore Wilhelm Engelmann

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  1. The discovery of The ChloroplastJulius Von Sachs &Theodore Wilhelm Engelmann By: Jan Villamor Anna- Maria Allen Amanda Brennan

  2. Previous Knowledge Phototropism Plants take in CO₂ and produce O₂ (from the discoveries of F.F Blackman, Van Helmot, and Jan Ingenhousz)

  3. Julius Von Sachs (1832-1897) A German botanist Fouder of experimental plant physiology Discovered that photosynthesis occurred in the chloroplast Found out that starch is present in chloroplasts by using the Iodine test It is thanks to him that we have the Iodine test that we use today Had a great influence on British and American Botany

  4. Major experiments Grew plants in water instead of soil As a result, it demonstrated that plants can grow with just water, the right amount of nutrients and sunlight He used the Iodine test to show that carbon was first accumulated as starch in the leaves of plants Learned that chlorophyll, light and CO₂ are necessary for carbon fixation - carbon fixation is the first stage of the dark reaction of photosynthesis

  5. Theodore Wilhelm Engelmann (1843-1903) A German botanist, physiologist, microbiologist, university professor, and musician Showed that the light reactions of photosynthesis is converted into chemical energy within the choloroplast Aim was to discover which part of the cell functioned as light receptors

  6. Major Experiments Used a modified microscope that was able to distinguish and measure different wavelengths of light Measured the different wavelengths of light on photosynthetic activity Conducted an experiment that involved illuminating a filamentous alga called Spiragoya (a form of green algae commonly found in freshwater ponds and ditches). -Light was passed through a prism, exposing all the parts of the spiragoya in different wavelengths - aerobic bacteria were used to locate where the alga was releasing the most oxygen - the bacteria clumped under the red and blue light

  7. Experiment Findings • Proved that photosynthesis takes place inside the chloroplasts of plants • Photosynthesis is necessary in order for plants to survive • Chloroplasts receive the most energy from red and blue light more than any other colour in the spectrum. A year later, Engelmann discovered that purple bacteria used UV light in the same way

  8. Link: Basics of the Chloroplast

  9. References: 1) "Julius von Sachs Facts, information, pictures | Encyclopedia.com articles about Julius von Sachs." Encyclopedia - Online Dictionary | Encyclopedia.com: Get facts, articles, pictures, video. N.p., n.d. Web. 13 Nov. 2010. <http://www.encyclopedia.com/topic/Julius_von_Sachs.aspx>. 2) Nair, Sonia. "What is Spirogyra." Buzzle Web Portal: Intelligent Life on the Web. N.p., n.d. Web. 14 Nov. 2010. <http://www.buzzle.com/articles/what-is-spirogyra.html>. 3) "Theodor Wilhelm Engelmann - Wikipedia, the free encyclopedia." Wikipedia, the free encyclopedia. N.p., n.d. Web. 14 Nov. 2010. <http://en.wikipedia.org/wiki/Theodor_Wilhelm_Engelmann>.

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