نتایج جستجو برای: free energy activation

تعداد نتایج: 1525654  

Journal: :Biochemical Society transactions 2004
I Tinoco D Collin P T X Li

We have used laser tweezers to unfold single RNA molecules at room temperature and in physiological-type solvents. The forces necessary to unfold the RNAs are over the range 10-20 pN, forces that can be generated by cellular enzymes. The Gibbs free energy for the unfolding of TAR (transactivation-responsive) RNA from HIV was found to be increased after the addition of argininamide; the TAR hair...

Journal: :international journal of nano dimension 0
pragnesh n. dave department of chemistry, kskv kachchh university, bhuj gujarat india parvin n. ram department of chemistry, kskv kachchh university, bhuj gujarat india shalini chaturvedi department of chemistry, kskv kachchh university, bhuj gujarat india

composite solid propellants were prepared with and without nano-alloys (ti-co, ti-ni, ti-zn), where nano-alloys used as catalyst. these nano-alloys are prepared by hydrazine reduction method. catalytic properties of these nanomaterials were measured on ammonium perchorate/hydroxyterminatedpolybutadiene propellant by thermogravimetery analysis and differential thermal analysis. both experimental...

Journal: :iranian journal of catalysis 2013
s. ali beyramabadi ali morsali

palladium (ii) coordination complexes catalyze the reaction of alcohols with ketones to yield ethers. during the catalytic cycle, the alcohol adds selectively to the β-carbon (anti-markovnikov). in this work, mechanism and kinetics for the reaction of methanol with methyl vinyl ketone (mvk), being catalyzed by pd, has been theoretically investigated in detail. using quantum mechanical approach,...

In the present study, we investigated the ability of an immobilized phospholipase A1 (PLA1) in degumming of soybean oil. The enzyme was immobilized by simple adsorption on bentonite without any further modification. The free and immobilized PLA1 were characterized by Fourier Transform InfraRed (FT-IR) spectroscopy and X-Ray Diffraction (XRD). The immobilizat...

Journal: :journal of physical & theoretical chemistry 2015
m. abul kashem liton sabrina helen mukta das dipa islam m. rabiul karim

the acidity constants (pka) of thirty four (34) ;-substituted carboxylic acids in aqueous solution havebeen calculated using conductor-like polarizable continuum (c-pcm) solvation model. the gasphaseenergies at the density functional theory (dft-mpw1pw91) and solvation energies athartree fock (hf) are combined to estimate the pka values which are very close to the experimentalvalues where, and ...

Ahmad Reza Massah Mehran Ghiaci

The 1H and natural-abundance 13C-NMR spectra of 1-thiacyclooctan-3-one (1) have been measured from 25 to -100°C. Coalescence is observed in the 1H-NMR spectra of (1) at about -80°C, and attributed to ring inversion in a boat-chair conformation, which is the predominant conformation of (1). The free energy of activation (DG¹</s...

Journal: :journal of physical and theoretical chemistry 0
m. abul kashem liton department of chemistry, mawlana bhashani science and technology university, santosh, tangail-1902, bangladesh sabrina helen department of chemistry, mawlana bhashani science and technology university, santosh, tangail-1902, bangladesh mukta das department of chemistry, mawlana bhashani science and technology university, santosh, tangail-1902, bangladesh dipa islam department of chemistry, mawlana bhashani science and technology university, santosh, tangail-1902, bangladesh m. rabiul karim department of chemistry, mawlana bhashani science and technology university, santosh, tangail-1902, bangladesh

the acidity constants (pka) of thirty four (34) ;-substituted carboxylic acids in aqueous solution havebeen calculated using conductor-like polarizable continuum (c-pcm) solvation model. the gasphaseenergies at the density functional theory (dft-mpw1pw91) and solvation energies athartree fock (hf) are combined to estimate the pka values which are very close to the experimentalvalues where, and ...

Journal: :Proceedings of the National Academy of Sciences 2014

Ali Morsali S. Ali Beyramabadi,

Palladium (II) coordination complexes catalyze the reaction of alcohols with ketones to yield ethers. During the catalytic cycle, the alcohol adds selectively to the β-carbon (anti-Markovnikov). In this work, mechanism and kinetics for the reaction of methanol with methyl vinyl ketone (MVK), being catalyzed by Pd, has been theoretically investigated in detail. Using quantum mechanical approach,...

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