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The rate constant for the vapor phase reaction of heptachlorodibenzo-p-dioxin with photochemically produced hydroxyl radicals has been estimated to be 1.3x10 −12 cu cm/molecule-sec at 25 °C which corresponds to an atmospheric half-life of 12.3 days at an atmospheric concentration of 5x10 5 hydroxyl radicals per cu cm.
Fibonacci sequence. In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn . The sequence commonly starts from 0 and 1, although some authors start the sequence from 1 and 1 or sometimes ...
The global electromagnetic resonance phenomenon is named after physicist Winfried Otto Schumann who predicted it mathematically in 1952. Schumann resonances are the principal background in the part of the electromagnetic spectrum [2] from 3 Hz through 60 Hz [3] and appear as distinct peaks at extremely low frequencies around 7.83 Hz (fundamental), 14.3, 20.8, 27.3, and 33.8 Hz.
In fact, in a retrospective study assessing 103,218 deaths, researchers found that those with a BMI of 30 or higher who were classified as having obesity had a 1.5-2.7 times higher risk of death ...
Scientists using an ocean drilling vessel have dug the deepest hole ever in rock from Earth's mantle - penetrating 4,160 feet (1,268 meters) below the Atlantic seabed - and obtained a large sample ...
The group didn’t score their first No. 1 hit until 2005 after being dropped by their record label in 2002, but even the song’s success didn’t come without personal heartbreak.
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Encorafenib, sold under the brand name Braftovi, is a medication used for the treatment of certain melanoma cancers. It is a small molecule BRAF inhibitor [4] that targets key enzymes in the MAPK signaling pathway. This pathway occurs in many different cancers including melanoma and colorectal cancers. [5]