scholarly journals Study of Molecular interaction in Binary Mixtures containing N, N-Dimethylformamide and n-Butanol

2021 ◽  
Vol 17 (01) ◽  
pp. 1-8
Author(s):  
BISWAJIT SAMANTARAY ◽  
◽  
MANOJ KUMAR PRAHARAJ ◽  
SMRUTI PRAVA DAS ◽  
◽  
...  
Keyword(s):  
Experimental Data ◽  
Free Energy ◽  
Acoustic Impedance ◽  
Molecular Interaction ◽  
Polar Solvent ◽  
Adiabatic Compressibility ◽  
Structure And Function ◽  
Water Soluble ◽  
Thermodynamical Parameters ◽  
And Function

The acoustic studies of the interactions between alcohol molecules and water soluble polar solvent DMF are significant for understanding the relationships between structure and function of polar molecule like DMF, and for explaining the mechanisms of interaction of alcoholic OH group with an electronegative moiety. In this piece of work Ultrasonic velocity, density and viscosity have been measured at 298 K, 308 K, 318 K and 328 K for mixture of N,N-dimethylformamide (DMF) and n-butanol, the frequency being maintained at a constant value. The experimental data have been used to calculate the acoustical and thermodynamical parameters like adiabatic compressibility, free length, free volume, internal pressure, acoustic impedance, Gibbs free energy

scholarly journals Acoustical Studies on the Ternary Mixture of 1, 4- Dioxane + Chloroform + Cyclohexane liquid Mixtures At 303.15, 308.15 and 313.15 K

2012 ◽  
Vol 9 (1) ◽  
pp. 415-419
Author(s):  
V. Vanathi ◽  
S. Mullainathan ◽  
S. Nithiyanantham
Keyword(s):  
Experimental Data ◽  
Molecular Interaction ◽  
Ternary Mixture ◽  
Adiabatic Compressibility ◽  
Liquid Mixtures ◽  
The Other ◽  
Exact Nature ◽  
Free Length ◽  
Intermolecular Free Length ◽  
Thermodynamical Parameters

Ultrasonic velocity, density and viscosity of the ternary mixture of 1, 4- dioxane + chloroform + cyclohexane, were measured at 303.15, 308.15 and 313.15 K. The thermodynamical parameters such as adiabatic compressibility (β), intermolecular free length (Lf), free volume (Vf), internal pressure (πi), acoustic impedance (Z), molar sound velocity (R) and molar compressibility (W) have been obtained from the experimental data for all the mixtures, with a view to investigate the exact nature of molecular interaction. Adiabatic compressibility and intermolecular free length decrease with increase in concentration and temperature. The other parameters show almost increasing concentration of solutes. These parameters have been further used to interpret the molecular interaction part of the solute and solvent in the mixtures.

scholarly journals Molecular Interaction Studies on N-Alkanols with DMA in Toluene at 303K

2010 ◽  
Vol 7 (2) ◽  
pp. 465-472 ◽  
Author(s):  
S. Thirumaran ◽  
J. Earnest Jayakumar ◽  
B. Hubert Dhanasundaram
Keyword(s):  
Experimental Data ◽  
Molecular Interactions ◽  
Acoustic Impedance ◽  
Molecular Interaction ◽  
Adiabatic Compressibility ◽  
Molecular Association ◽  
Acoustical Parameters ◽  
Intermolecular Free Length ◽  
Dimethyl Acetamide ◽  
Hydrogen Bonded

The ultrasonic study of velocity, density and viscosity has been measured for the mixtures ofn-alkanols, namely; 1-propoanol, 1-butanol and 1-pentanol in toluene withN-Ndimethyl acetamide (DMA) at 303K. The experimental data have been used to calculate the acoustical parameters such as adiabatic compressibility (β), intermolecular free length (Lf), free volume (Vf), internal pressure (πi) and acoustic impedance (Z). The excess values of the above parameters have also been evaluated and presented. From the present investigation, it is obvious that a weak molecular association was identified. Mixing of DMA withnalkanols causes dissociation of hydrogen bonded structures ofn- alkanols. Also, further addition of DMA with the mixture not only causes dissociation of hydrogen bonded structures ofn-alkanols but also a decrease in molecular association between toluene andn-alkanols is observed. The evaluated excess values predict weak molecular interactions existing between DMA-n-alkanols as well as toluene-n-alkanols.

scholarly journals Ultrasonic Study of Molecular Interactions in Binary Mixtures at 303 K

2010 ◽  
Vol 7 (2) ◽  
pp. 353-356 ◽  
Author(s):  
S. Mullainathan ◽  
S. Nithiyanantham
Keyword(s):  
Experimental Data ◽  
Internal Pressure ◽  
Molecular Interactions ◽  
Molecular Interaction ◽  
Binary Systems ◽  
Adiabatic Compressibility ◽  
Acoustical Parameters ◽  
Intermolecular Free Length ◽  
Wada’S Constant ◽  
Rao’S Constant

The ultrasonic velocity, density and viscosity at 303 K have been measured in the binary systems of 1,4-dioxane and acetone with water. From the experimental data, various acoustical parameters such as adiabatic compressibility (β), intermolecular free length (Lf), free volume (Vf), internal pressure (πi), Rao’s constant (R), Wada’s constant (W) and specific acoustical impedance (Z) were calculated. The results are interpreted in terms of molecular interaction between the components of the mixtures.

scholarly journals Study of Acoustical Parameters in Binary Liquid Mixture Containing 1-Butanol and Hexane at Temperatures 313.15 K, 318.15 K and 323.15 K

2013 ◽  
Vol 18 ◽  
pp. 1-7
Author(s):  
C.H. Srinivasu ◽  
K. Anil Kumar ◽  
S.K. Fakruddin ◽  
K. Narendra ◽  
T. Anjaneyulu
Keyword(s):  
Experimental Data ◽  
Molecular Interactions ◽  
Acoustic Impedance ◽  
Entire Range ◽  
Liquid Mixture ◽  
Adiabatic Compressibility ◽  
Binary Liquid Mixture ◽  
Acoustical Parameters ◽  
Binary Liquid ◽  
Different Temperatures

The values of ultrasonic velocity (u), density (ρ), and viscosity (η) have been measured experimentally in the binary liquid mixture containing 1-butanol and hexane over the entire range of composition at different temperatures 313.15 K, 318.15 K and 323.15 K. This experimental data have been used to calculate the acoustical parameters such as adiabatic compressibility (β), free length (Lf), molar volume (Vm) and acoustic impedance(z). The results have been qualitatively used to explain the molecular interactions between the components of the liquid mixture.

scholarly journals Ultrasonic Investigations of Molecular Interaction in Binary Mixtures of Benzyl Benzoate with Acetonitrile and Benzonitrile

2011 ◽  
Vol 8 (1) ◽  
pp. 457-469 ◽  
Author(s):  
N. Jaya Madhuri ◽  
P. S. Naidu ◽  
J. Glory ◽  
K. Ravindra Prasad
Keyword(s):  
Experimental Data ◽  
Activation Energy ◽  
Internal Pressure ◽  
Binary Mixtures ◽  
Molecular Interactions ◽  
Molecular Interaction ◽  
Adiabatic Compressibility ◽  
Benzyl Benzoate ◽  
Theoretical Evaluation ◽  
Excess Parameters

Ultrasonic velocity, density and viscosity have been measured in the binary mixtures of benzyl benzoate with acetonitrile, benzonitrile at three temperatures 30, 40 and 50°C. From the experimental data, thermodynamic parameters like adiabatic compressibility, internal pressure, enthalpy, activation energy etc., were computed and the molecular interactions were predicted based on the variation of excess parameters in the mixture. Also theoretical evaluation of velocities was made employing the standard theories. CFT and NOMOTO were found to have an edge. All the three mixtures have shown out strong intermolecular interactions between the unlike molecules and endothermic type of chemical reaction.

Small membrane proteins – elucidating the function of the needle in the haystack

2014 ◽  
Vol 395 (12) ◽  
pp. 1365-1377 ◽  
Author(s):  
Grant Kemp ◽  
Florian Cymer
Keyword(s):  
Amino Acids ◽  
Membrane Proteins ◽  
Soluble Proteins ◽  
Structure And Function ◽  
Ribosome Profiling ◽  
Water Soluble ◽  
Eukaryotic Cells ◽  
Large Numbers ◽  
A Cell ◽  
And Function

Abstract Membrane proteins are important mediators between the cell and its environment or between different compartments within a cell. However, much less is known about the structure and function of membrane proteins compared to water-soluble proteins. Moreover, until recently a subset of membrane proteins, those shorter than 100 amino acids, have almost completely evaded detection as a result of technical difficulties. These small membrane proteins (SMPs) have been underrepresented in most genomic and proteomic screens of both pro- and eukaryotic cells and, hence, we know much less about their functions in both. Currently, through a combination of bioinformatics, ribosome profiling, and more sensitive proteomics, large numbers of SMPs are being identified and characterized. Herein we describe recent advances in identifying SMPs from genomic and proteomic datasets and describe examples where SMPs have been successfully characterized biochemically. Finally we give an overview of identified functions of SMPs and speculate on the possible roles SMPs play in the cell.

Dimeric/oligomeric DNA methyltransferases: an unfinished story

2009 ◽  
Vol 390 (9) ◽  
Author(s):  
Ernst G. Malygin ◽  
Alexey A. Evdokimov ◽  
Stanley Hattman
Keyword(s):  
Experimental Data ◽  
Dna Methyltransferases ◽  
Structure And Function ◽  
Type I ◽  
Type Ii ◽  
Kinetic Characteristics ◽  
Biological Substrate ◽  
Oligomeric Dna ◽  
And Function

Abstract DNA methyltransferases (MTases) are enzymes that carry out post-replicative sequence-specific modifications. The initial experimental data on the structure and kinetic characteristics of the EcoRI MTase led to the paradigm that type II systems comprise dimeric endonucleases and monomeric MTases. In retrospect, this was logical because, while the biological substrate of the restriction endonuclease is two-fold symmetrical, the in vivo substrate for the MTase is generally hemi-methylated and, hence, inherently asymmetric. Thus, the paradigm was extended to include all DNA MTases except the more complex bifunctional type I and type III enzymes. Nevertheless, a gradual enlightenment grew over the last decade that has changed the accepted view on the structure of DNA MTases. These results necessitate a more complex view of the structure and function of these important enzymes.

scholarly journals Molecular Interaction Maps of Bioregulatory Networks: A General Rubric for Systems Biology

2006 ◽  
Vol 17 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Kurt W. Kohn ◽  
Mirit I. Aladjem ◽  
John N. Weinstein ◽  
Yves Pommier
Keyword(s):  
Computer Simulation ◽  
Systems Biology ◽  
Molecular Interactions ◽  
Molecular Interaction ◽  
Structure And Function ◽  
Graphical Notations ◽  
Interaction Map ◽  
And Function ◽  
Network Diagrams

A standard for bioregulatory network diagrams is urgently needed in the same way that circuit diagrams are needed in electronics. Several graphical notations have been proposed, but none has become standard. We have prepared many detailed bioregulatory network diagrams using the molecular interaction map (MIM) notation, and we now feel confident that it is suitable as a standard. Here, we describe the MIM notation formally and discuss its merits relative to alternative proposals. We show by simple examples how to denote all of the molecular interactions commonly found in bioregulatory networks. There are two forms of MIM diagrams. “Heuristic” MIMs present the repertoire of interactions possible for molecules that are colocalized in time and place. “Explicit” MIMs define particular models (derived from heuristic MIMs) for computer simulation. We show also how pathways or processes can be highlighted on a canonical heuristic MIM. Drawing a MIM diagram, adhering to the rules of notation, imposes a logical discipline that sharpens one's understanding of the structure and function of a network.

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