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A partial solar eclipse on December 14, 2001, viewed from Minnesota (Saros 132, Member 45) An annular solar eclipse on December 26, 2019, viewed from Nilambur, India (Saros 132, Member 46)
It was seen during the Fall of Constantinople (the capture of the capital of the Byzantine Empire), during the siege that lasted from Thursday, 5 April 1453 until Tuesday, 29 May 1453), after which the city fell to the Ottomans.
Theodor Wilhelm Engelmann (14 November 1843 – 20 May 1909) was a German botanist, physiologist, microbiologist, university professor, and musician whose 1882 experiment measured the effects of different colors of light on photosynthetic activity and showed that the conversion of light energy to chemical energy took place in the chloroplast.
A partial lunar eclipse occurred at the Moon’s ascending node of orbit on Wednesday, September 18, 2024, [1] with an umbral magnitude of 0.0869. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened.
cross section of a curled leaf of Ammophila (plant) (40x magnified); white buliform cells are visible at the base of the grooves. During drought, the loss of water through vacuoles induces the reduced bulliform cells to allow the leaves of many grass species to close and the two edges of the grass blade fold toward each other.
Hyder, Avery, MacLeod and McCarty used strands of purified DNA such as this, precipitated from solutions of cell components, to perform bacterial transformations. The Avery–MacLeod–McCarty experiment was an experimental demonstration by Oswald Avery, Colin MacLeod, and Maclyn McCarty that, in 1944, reported that DNA is the substance that causes bacterial transformation, in an era when it ...