Dodecamer DNA Duplex Formation Is Characterized by Second-Order Kinetics, Positive Activation Energies, and a Dependence on Sequence and Mg2+Ion Concentration†

Biochemistry ◽  
2008 ◽  
Vol 47 (50) ◽  
pp. 13153-13157 ◽  
Author(s):  
Ernesto Carrillo-Nava ◽  
Yamilet Mejía-Radillo ◽  
Hans-Jürgen Hinz
Keyword(s):  
Activation Energies ◽  
Second Order ◽  
Ion Concentration ◽  
Dna Duplex ◽  
Duplex Formation

Successive Fusion of Vesicles Aggregated by DNA Duplex Formation in the Presence of Triton X-100

2008 ◽  
Vol 37 (3) ◽  
pp. 340-341 ◽  
Author(s):  
Naoto Maru ◽  
Koh-ichiroh Shohda ◽  
Tadashi Sugawara
Keyword(s):  
Dna Duplex ◽  
Triton X ◽  
Duplex Formation

Direct Visualization of DNA Duplex Formation on the Surface of a Giant Liposome

ChemBioChem ◽  
2003 ◽  
Vol 4 (8) ◽  
pp. 778-781 ◽  
Author(s):  
Koh-ichiroh Shohda ◽  
Taro Toyota ◽  
Tetsuya Yomo ◽  
Tadashi Sugawara
Keyword(s):  
Direct Visualization ◽  
Dna Duplex ◽  
Duplex Formation ◽  
Giant Liposome

scholarly journals Adsorption of Cu (II) and Ni (II) Ions from Solution onto Calcium Alginate Beads

2020 ◽  
Vol 24 (2) ◽  
pp. 329-333
Author(s):  
D.O. Jalija ◽  
A . Uzairu
Keyword(s):  
Contact Time ◽  
Calcium Alginate ◽  
Alginate Beads ◽  
Second Order ◽  
Ion Concentration ◽  
Order Kinetic ◽  
Calcium Alginate Beads ◽  
First Order ◽  
Pseudo Second Order ◽  
Pseudo First Order

The objective of this study was to investigate the biosorption of Cu (II) and Ni (II) ions from aqueous solution by calcium alginate beads. The effects of solution pH, contact time and initial metal ion concentration were evaluated. The results showed that maximum Cu (II) removal (93.10%) occurred at pH of 9.0, contact time of 120 minutes and initial ion concentration of 10 mg/L while that of Ni (II) was 94.6%, which was achieved at pH of 8.0, contact time of 120 minutes and initial ion concentration of 10 mg/L. The equilibrium data fitted well to the Langmuir Isotherm indicating that the process is a monolayer adsorption. The coefficients of determination, R2, values for the Langmuir Isotherm were 0.9799 and 0.9822 respectively for Cu (II) and Ni (II) ions. The values of the maximum biosorption capacity, Qo, were 10.79 and 6.25 mgg-1 respectively. The kinetic data also revealed that the sorption process could best be described by the pseudo – second order kinetic model. The R2 values for the pseudo – second order kinetic plots for Cu (II) and Ni (II) were 0.9988 and 0.9969 respectively. These values were higher than those for the pseudo – first order plots. The values of the biosorption capacity qe obtained from the pseudo – second order plots were very close to the experimental values of qe indicating that the biosorption process follows the second order kinetics. This study has therefore shown that calcium alginate beads can be used for the removal of Cu (II) and Ni (II) ions from wastewaters. Keywords: Keywords: Adsorption, Calcium alginate, Isotherm, Langmuir, Pseudo- first order, Pseudo-second order

Photocontrol of DNA Duplex Formation by Using Azobenzene-Bearing Oligonucleotides

ChemBioChem ◽  
2001 ◽  
Vol 2 (1) ◽  
pp. 39-44 ◽  
Author(s):  
Hiroyuki Asanuma ◽  
Xingguo Liang ◽  
Takayuki Yoshida ◽  
Makoto Komiyama
Keyword(s):  
Dna Duplex ◽  
Duplex Formation

scholarly journals Dynamics of the DNA Duplex Formation Studied by Single Molecule Force Measurements

2004 ◽  
Vol 87 (5) ◽  
pp. 3388-3396 ◽  
Author(s):  
U. Bockelmann ◽  
P. Thomen ◽  
F. Heslot
Keyword(s):  
Single Molecule ◽  
Force Measurements ◽  
Dna Duplex ◽  
Duplex Formation

Adsorption of heavy metals from aqueous solutions by Mg–Al–Zn mingled oxides adsorbent

2016 ◽  
Vol 74 (7) ◽  
pp. 1644-1657 ◽  
Author(s):  
Mona El-Sayed ◽  
Gh. Eshaq ◽  
A. E. ElMetwally
Keyword(s):  
Heavy Metals ◽  
Metal Ion ◽  
Second Order ◽  
Ion Concentration ◽  
Precipitation Method ◽  
Isotherm Models ◽  
Infrared Spectrometry ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Pseudo Second Order

In our study, Mg–Al–Zn mingled oxides were prepared by the co-precipitation method. The structure, composition, morphology and thermal stability of the synthesized Mg–Al–Zn mingled oxides were analyzed by powder X-ray diffraction, Fourier transform infrared spectrometry, N2 physisorption, scanning electron microscopy, differential scanning calorimetry and thermogravimetry. Batch experiments were performed to study the adsorption behavior of cobalt(II) and nickel(II) as a function of pH, contact time, initial metal ion concentration, and adsorbent dose. The maximum adsorption capacity of Mg–Al–Zn mingled oxides for cobalt and nickel metal ions was 116.7 mg g−1, and 70.4 mg g−1, respectively. The experimental data were analyzed using pseudo-first- and pseudo-second-order kinetic models in linear and nonlinear regression analysis. The kinetic studies showed that the adsorption process could be described by the pseudo-second-order kinetic model. Experimental equilibrium data were well represented by Langmuir and Freundlich isotherm models. Also, the maximum monolayer capacity, qmax, obtained was 113.8 mg g−1, and 79.4 mg g−1 for Co(II), and Ni(II), respectively. Our results showed that Mg–Al–Zn mingled oxides can be used as an efficient adsorbent material for removal of heavy metals from industrial wastewater samples.

Specific DNA Duplex Formation at an Artificial Lipid Bilayer: towards a New DNA Biosensor Technology

2012 ◽  
Vol 9 (2) ◽  
pp. 272-281 ◽  
Author(s):  
Emma Werz ◽  
Sergei Korneev ◽  
Malayko Montilla-Martinez ◽  
Richard Wagner ◽  
Roland Hemmler ◽  
...  
Keyword(s):  
Lipid Bilayer ◽  
Dna Biosensor ◽  
Dna Duplex ◽  
Biosensor Technology ◽  
Duplex Formation

Equilibrium, kinetic and thermodynamic studies of mercury adsorption on almond shell

2012 ◽  
Vol 65 (8) ◽  
pp. 1341-1349 ◽  
Author(s):  
Shokooh Sadat Khaloo ◽  
Amir Hossein Matin ◽  
Sahar Sharifi ◽  
Masoumeh Fadaeinia ◽  
Narges Kazempour ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Low Cost ◽  
Second Order ◽  
Ion Concentration ◽  
Physical Parameters ◽  
Maximum Adsorption Capacity ◽  
Almond Shell ◽  
Pseudo Second Order ◽  
Uptake Process ◽  
Reaction Equations

The application of almond shell as a low cost natural adsorbent to remove Hg2+ from aqueous solution was investigated. Batch experiments were carried out to evaluate the adsorption capacity of the material. The chemical and physical parameters such as pH, sorbent amount, initial ion concentration, and contact time were optimized for the maximum uptake of mercury onto the solid surface. Adsorption isotherms were expressed by Langmuir and Freundlich adsorption models, and the experimental data were found to fit the Langmuir model rather than the Freundlich. The maximum adsorption capacity obtained from the Langmuir isotherm was 135.13 mg/g. A kinetic study was carried out with pseudo-first-order and pseudo-second-order reaction equations and it was found that the Hg2+ uptake process followed the pseudo-second-order rate expression. The thermodynamic values, ΔG0, ΔH0 and ΔS0, indicated that adsorption was an endothermic and spontaneous process. The potential of this material for mercury elimination was demonstrated by efficient Hg2+ removal from a synthetic effluent.

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