activation records - definition. What is activation records
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%ما هو (من)٪ 1 - تعريف

ENERGY THAT MUST BE INPUT TO A SYSTEM TO UNDERGO A REACTION OR PROCESS
Energy of activation; Activation Energy; Thermal activation; Energy barrier; Activation enthalpy; Activation barrier; Reaction threshold; Activation threshold; Activation energy barrier
  • exothermic]] reaction
  • These are PES profiles for the reaction of hydrogen gas and tungsten. The reaction profile in the left shows a 2 dimensional pathway of the procedure. On the right side it is shown a 1 dimension perspective of the same trajectory.

CRISPR activation         
  • The dCas9-VPR activator increases transcription at the gene that it targets.
  • The use of the Suntag system allows multiple antibodies fused to VP64 to bind to dCas9-Suntag. That in turn recruits RNA polymerase and increases gene expression.
  • The dCas-SAM system uses msgRNA that has attached aptamers for different transcriptional factors (MS2,p65 and HSF1) to bind.
  • Complementary base pairing between the sgRNA and genomic DNA allows targeting of Cas9 or dCas9
PROGRAMMABLE TRANSCRIPTIONAL ACTIVATOR
User:Mjlink/sandbox; DCas9 Activation Systems; DCas9; SunTag; DCas9 activation system
CRISPR activation (CRISPRa) is a type of CRISPR tool that uses modified versions of CRISPR effectors without endonuclease activity, with added transcriptional activators on dCas9 or the guide RNAs (gRNAs).
Automatic activation device         
  • [[CYPRES]] II panel
DEVICE THAT AUTOMATICALLY OPENS A PARACHUTE
Automatic Activation Device
In skydiving, an automatic activation device (AAD) is a dead man's switch consisting of an electronic-pyrotechnic or mechanical device that automatically opens the main or reserve parachute container at a preset altitude or after a preset time.
Carbon–hydrogen bond activation         
  • pmid=21359404}}</ref>
  • C–H activation by Bergman et al. (left) and Graham et al.
  • Cobalt-catalyzed C-H activation
  • Fujiwara's palladium- and copper-catalyzed C-H functionalization
  • Hartwig borylation
  • 482x482px
  • C–H Bond activation Periana 1998
  • Key step in synthesis of lithospermic acid
  • C–H activation of pentane, as seen in Ledgzdins et al., ''J. Am. Chem. Soc.'' 2007; 129, 5372–3.
  • Ru catalyst based borylation
  • Mechanism for Pd-catalyzed C-H activation
CLASS OF CHEMICAL REACTIONS
C-H activation; Carbon-hydrogen bond activation; CH activation; C-H bond activation:; C−H activation reaction; C-H bond activation; C-H activation reaction; C−H bond activation; C–H bond activation; C–H activation; C-H functionalization
Carbon–hydrogen bond functionalization (C–H functionalization) is a type of reaction in which a carbon–hydrogen bond is cleaved and replaced with a carbon–X bond (where X is usually carbon, oxygen, or nitrogen). The term usually implies that a transition metal is involved in the C-H cleavage process.

ويكيبيديا

Activation energy

In chemistry and physics, activation energy is the minimum amount of energy that must be provided for compounds to result in a chemical reaction. The activation energy (Ea) of a reaction is measured in joules per mole (J/mol), kilojoules per mole (kJ/mol) or kilocalories per mole (kcal/mol). Activation energy can be thought of as the magnitude of the potential barrier (sometimes called the energy barrier) separating minima of the potential energy surface pertaining to the initial and final thermodynamic state. For a chemical reaction to proceed at a reasonable rate, the temperature of the system should be high enough such that there exists an appreciable number of molecules with translational energy equal to or greater than the activation energy. The term "activation energy" was introduced in 1889 by the Swedish scientist Svante Arrhenius.