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L-Ribulose 5-phosphate 4-epimerase catalyzes the epimerization of L-ribulose 5-phosphate to D-xylulose 5-phosphate by retro-aldol cleavage and subsequent aldol reaction.The proposed mechanism involves the abstraction of the proton from the hydroxyl group on C-4, followed by cleavage of the bond between C-3 and C-4 to give a metal-stabilized acetone enediolate and a glycolaldehyde phosphate ...
Protactinium-231 arises naturally from the decay of natural uranium-235, and artificially in nuclear reactors by the reaction 232 Th + n → 231 Th + 2n and the subsequent beta decay of 231 Th. It was once thought to be able to support a nuclear chain reaction, which could in principle be used to build nuclear weapons ; the physicist Walter ...
In enzymology, an alpha,alpha-trehalose-phosphate synthase (UDP-forming) (EC 2.4.1.15) is an enzyme that catalyzes the chemical reaction UDP-glucose + D-glucose 6-phosphate ⇌ {\displaystyle \rightleftharpoons } UDP + alpha,alpha-trehalose 6-phosphate
Aluminium's is 75.2 GPa; copper's 137.8 GPa; and mild steel's is 160–169 GPa. [13] Thorium is about as hard as soft steel, so when heated it can be rolled into sheets and pulled into wire. [14] Thorium is nearly half as dense as uranium and plutonium and is harder than both. [14] It becomes superconductive below 1.4 K. [12]
One isotope, 229 Th, has a nuclear isomer (or metastable state) with a remarkably low excitation energy, [5] recently measured to be 8.355 733 554 021 (8) eV [6] [7] It has been proposed to perform laser spectroscopy of the 229 Th nucleus and use the low-energy transition for the development of a nuclear clock of extremely high accuracy.
Its decay product, 231 Pa, gradually precipitates to the bottom, so that its concentration first increases with depth and then stays nearly constant. 231 Pa decays to 227 Ac; however, the concentration of the latter isotope does not follow the 231 Pa depth profile, but instead increases toward the sea bottom.
Virgin Australia crew members were allegedly sexually assaulted and robbed in one of Fiji's nightclub areas on New Year's Day, the island country's Deputy Prime Minister Viliame Gavoka announced.
The most stable isotope is 231 Pa with a half-life of 32,760 years, 233 Pa with a half-life of 26.967 days, and 230 Pa with a half-life of 17.4 days. All of the remaining radioactive isotopes have half-lives less than 1.6 days, and the majority of these have half-lives less than 1.8 seconds.