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In 1745, John Needham (1713–1781) published a report of his own experiments, in which he briefly boiled broth infused with plant or animal matter, hoping to kill all preexisting microbes. 2 He then sealed the flasks.
Dec 25, 2022 · JOHN NEEDHAM (1713-1781) written by DrChika December 25, 2022. John Needham is the English scientist who performed experiments on spontaneous generation or abiogenesis in mutton broth and hay infusions. Needham showed that mutton broth boiled in flask and then sealed could still develop microorganisms, which supported the theory of spontaneous ...
Apr 21, 2024 · In 1745, John Needham (1713–1781) published a report of his own experiments, in which he briefly boiled broth infused with plant or animal matter, hoping to kill all preexisting microbes. 2 He then sealed the flasks. After a few days, Needham observed that the broth had become cloudy and a single drop contained numerous microscopic creatures.
Learning Objectives. Explain the theory of spontaneous generation and why people once accepted it as an explanation for the existence of certain types of organisms. Explain how certain individuals (van Helmont, Redi, Needham, Spallanzani, and Pasteur) tried to prove or disprove spontaneous generation.
Needham's global theory of generation through vegetation grew almost en- tirely out of his observations on the production of microorganisms in infusions. Although he was aware of other research on generation, particularly on the polyp and on regeneration, and although he had also conducted observations on.
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He became fascinated with microscopy, the use of microscopes to make scientific observations. In 1745, he published An Account of Some New Microscopical Discoveries. This work included his observations of different types of pollen.
(b) John Needham, who argued that microbes arose spontaneously in broth from a “life force.” (c) Lazzaro Spallanzani, whose experiments with broth aimed to disprove those of Needham. Describe the theory of spontaneous generation and some of the arguments used to support it.
