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Period: Jan 12, 1579 to
Jean Baptist Van Helmont
Jean Baptist Van Helmont was Flemish chemist, physiologist, and physician. He is at times, considered to be "the founder of pneumatic chemistry". Van Helmont was pro abiogenisis and was widely know for his 5 year tree experiment, and introduction to photosythesis. -
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Francesco Redi Life
Francesco Redi was an Italian physician, naturalist, and poet. In 1668 he published his book called “Esperienze intorno alla generazione degl’insetti” which means “Experiments on the Generation of Insects.” Francesco experimented by taking 8 jars and placed meat in all of them. He left two jars open out of the four, but covered the other four jars with muslin (a type of fabric). Maggots developed in the open jars but did not develop in the muslin-covered jars. -
Jean Baptist Van Helmont's Experiment/Major Contribution
Van Helmont strongly believed in abiogenisis and conducted an experiment that lasted 5+ years. He transplanted the roots of a willow tree into a large bucket of soil, after weighing each seperately. He hypothesized that if the tree took nutrients from the soil, the soil would lose weight. 5 years had passed, and he weighed both the tree and soil once again. The tree gained 164 pounds and the soil had lost 2 ounces. He discovered part of photosynthesis was was highly devleoped in later years. -
Francesco Redi Experiment/MajorContribution
Francecsco Redi was pro biogensis as his controlled experiments tried to defy abiogenisis. Redi discoveredt that when dead flies/maggots were placed in sealed jars with dead animals, maggots did not appear, but whenlive flies and maggots were placed in sealed jars, maggots appeared. Redi proved that live does not form freely and species have origins. http://www.scientus.org/Redi-Galileo.html -
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John Needham Life
Joh Needham was an English biologist and Roman Catholic priest. Needham was pro abiogenisis as a result of his experiment failing. -
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Lazzaro Spallanzani Life
Lazzaro Spallanzani was born in Scandianio and was well known throughout his life as a Italian Catholic Priest, a biologist and physiologist. Lazzaro's research of biogenisis aided Louis Pasteur and his investigations in later years. sources: http://en.wikipedia.org/wiki/Lazzaro_Spallanzani -
John Needham's Experiment/Major Contribution
Needham took chicken broth and boiled it, knowing that boiling would kill any form of living microorganisms. After boiling the chicken brother, he placed it into a flask and sealed it to see that microorganisms had infact grown, thus leading him to become pro abiogenisis. Needham's contribution included advancing the belief of sponataneous generation which was later on defyed. -
Lazzaro Spallanzani's Experiment
Lazzaro Spallanzani researched spontaneous generation of cellular life in the year 1768. Spallanzani's experiment suggested that microbes move through the air and can be killed from boiling. Along with spontaneous generation of cellular life, he discovered and described mammal reproduction, where he proved that you require semen and egg. Spallanzani was the first original to study echolocation and how bats travel through sound in the dark. -
Lazzaro Spallanzani's Major Contribution
Lazzaro Spallanzani interpreted the process of digestion, through a chemical solution taking place in the stomach and with the aid of gastric juice. -
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Louis Pasteur Life
Louis Pasteur was a strong believer of the biogentic theory, after he disproved abiogenisis by conducing his famous experiment in 1859. He is remembered for his major contributions in the causes and preventions of diseases.He reduced mortality from puerperal fever, and he created the first vaccines for rabies and anthrax.
http://www.preservearticles.com/2012042130925/how-did-louis-pasteur-disprove-abiogenesis-theory.htmlhttp://www.doctortee.com/dsu/tiftickjian/bio101/origin-of-life.html -
Louis Pasteur Experiment/Major Contribution
In 1859, Pasteur conducted his famous experiment to prove that life can only arise from preexisting life. Through boiling sugar and yeast, he placed it in a gooseneck flask. The way the flask was shaped blocked dust particles from entering except air molecules. After weeks there were no changes in the solution, Pasteur then broke the neck off his flask and within days there was mold growth. This proves that the life form (mold) didn't come from nowhere.
