proton donor वाक्य
उदाहरण वाक्य
मोबाइल
- Glu35 acts as a proton donor to the glycosidic bond, cleaving the C-O bond in the substrate, whereas Asp52 acts as a nucleophile to generate a glycosyl enzyme intermediate.
- It has been hypothesized that a nearby tyrosine acts as the proton donor and acceptor during the transaldimination step as well as the pK of the tyrosine, making proton transfers more facile.
- There exist three residues in the enzyme within a suitable distance of the C-4 that could be potential proton donors : Tyr-48, His-110 and Cys-298.
- In this reaction, the two aldehydes serve different purposes; one aldehyde donates a proton and one aldehyde accepts a proton . 4-Dimethylaminobenzaldehyde is an efficient proton donor while benzaldehyde is both a proton acceptor and donor.
- In "'acid catalysis "'and "'base catalysis "'a chemical reaction is proton donor and the base is the proton acceptor, known as Bronsted-Lowry acid and base respectively.
- Hydrogenation with Raney nickel gives the diol "'9 "'which on a double Mitsunobu reaction ( with an amine proton donor ) gives the azafenestrane "'10 "'as the borane salt.
- Although, is protonated acetic acid in ether a particularly good proton donor when " needed ", i . e . when it arrives at the reaction site ? talk ) 23 : 36, 19 August 2010 ( UTC)
- Arguing by analogy to the well known tunneling-inversion spectrum of ammonia, Klemperer recognized that the key to understanding the spectrum was to recognize that HF HF was undergoing quantum tunnelling to FH FH, interchanging the roles of proton donor and acceptor.
- The acids include bisphenol A, parabens, 1, 2, 3-triazole derivates, and 4-hydroxycoumarin and act as proton donors, changing the dye molecule between its leuco form and its protonated colored form; stronger acids would make the change irreversible.
- The acidity of hydronium is the implicit standard used to judge the strength of an acid in water : strong acids must be better proton donors than hydronium, otherwise a significant portion of acid will exist in a non-ionized state ( i . e . : a weak acid ).
- Protons are produced by a medical synchrotron or cyclotron, extracting them from proton donor materials and accelerating them in successive travels through a circular, evacuated conduit or cavity, using powerful magnets, until they reach sufficient energy ( usually about 200 MeV ) to enable them to approximately traverse a human body, then stop.
- Working with Lowry, he also developed the often-used theory of proton donation, theorizing that a hydrogen atom ( which is always found in an acid ) ionizes into hydronium upon dissolving in water, thereby losing its electron and becoming a proton donor, and that hydroxide ( a water molecule stripped of one of its two hydrogen atoms ) is a proton receiver.
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