Search results
Results From The WOW.Com Content Network
The femtometre (American spelling femtometer), symbol fm, [1] [2] (derived from the Danish and Norwegian word femten 'fifteen', Ancient Greek: μέτρον, romanized: metron, lit. 'unit of measurement') is a unit of length in the International System of Units (SI) equal to 10 −15 metres, which means a quadrillionth of one metre.
Boron-8 is an isotope of boron that undergoes β + decay to beryllium-8 with a half-life of 771.9(9) ms.It is the strongest candidate for a halo nucleus with a loosely-bound proton, in contrast to neutron halo nuclei such as lithium-11.
The nucleophilic lysine residue is commonly targeted site in protein bioconjugation, typically through amine-reactive N-hydroxysuccinimidyl (NHS) esters. [3] To obtain optimal number of deprotonated lysine residues, the pH of the aqueous solution must be below the pKa of the lysine ammonium group, which is around 10.5, so the typical pH of the reaction is about 8 and 9.
[8] [9] [10] In modern chemistry , the p stands for "the negative decimal logarithm of ", and is used in the term p K a for acid dissociation constants , [ 11 ] so pH is "the negative decimal logarithm of H + ion concentration", while pOH is "the negative decimal logarithm of OH- ion concentration".
The seventh member of group 18 is oganesson, an unstable synthetic element whose chemistry is still uncertain because only five very short-lived atoms (t 1/2 = 0.69 ms) have ever been synthesized (as of 2020 [3]).
10 5 = 100,000 [1] 10 −5 = 0.00001 [ 2 ] The notation of m E n , known as E notation , is used in computer programming, spreadsheets and databases, but is not used in scientific papers.
All of the significant digits remain, but the placeholding zeroes are no longer required. Thus 1 230 400 would become 1.2304 × 10 6 if it had five significant digits. If the number were known to six or seven significant figures, it would be shown as 1.230 40 × 10 6 or 1.230 400 × 10 6. Thus, an additional advantage of scientific notation is ...
1.0 picoseconds (1.0 ps) – cycle time for electromagnetic frequency 1 terahertz (THz) (1 x 10 12 hertz), an inverse unit. This corresponds to a wavelength of 0.3 mm, as can be calculated by multiplying 1 ps by the speed of light (approximately 3 x 10 8 m/s) to determine the distance traveled. 1 THz is in the far infrared .