Department of Physics: Recent submissions

  • Force induced unzipping of dsDNA: The solvent effect 
    Singh, Navin (Physics Express, 2013)
    The salt concentration of the solution plays an important role in the stabilization of double stranded DNA (dsDNA) molecule. In our work, the Hamiltonian in Peyrard-Bishop Dauxois (PBD) model of a heterogeneous chain has ...
  • Melting of DNA in confined geometries 
    Singh, Navin (Springer, 2020-09)
    The stability of DNA molecules during viral or biotechnological encapsulation is a topic of active current research. We studied the thermal stability of double-stranded DNA molecules of different lengths in a confined ...
  • Pulling DNA: The Effect of Chain Length on the Mechanical Stability of DNA Chain 
    Singh, Navin (Wiley, 2015-11)
    We have investigated the effect of chain length on the thermal denaturation as well as on mechanical unzipping of double stranded DNA (ds-DNA) molecule. We use a simple nonlinear Peyrard Bishop and Dauxois (PBD) model and ...
  • Opening of DNA chain due to force applied on different locations 
    Singh, Navin (APS, 2016-09)
    We consider a homogeneous DNA molecule and investigate the effect of random force applied on the unzipping profile of the molecule. How the critical force varies as a function of the chain length or number of base pairs ...
  • Effect of genome sequence on the force-induced unzipping of a DNA molecule 
    Singh, Navin (Springer, 2006-02)
    We considered a dsDNA polymer in which distribution of bases are random at the base pair level but ordered at a length of 18 base pairs and calculated its force elongation behaviour in the constant extension ensemble. The ...
  • Pulling short DNA molecules having defects on different locations 
    Singh, Navin (APS, 2015-09)
    We present a study on the role of defects on the stability of short DNA molecules. We consider short DNA molecules (16 base pairs) and investigate the thermal as well as mechanical denaturation of these molecules in the ...
  • DNA melting in the presence of molecular crowders 
    Singh, Navin (RSC, 2017-07)
    We study the opening of double stranded DNA (dsDNA) in the presence of molecular crowders using the Peyrard–Bishop–Dauxois (PBD) model. It is a known fact that about 15–20% of the total volume of a cell is occupied by ...
  • Phase diagram of mechanically stretched DNA: The salt effect 
    Singh, Navin (Elsevier, 2013-05)
    The cations, in the form of salt, present in a solution containing DNA play a crucial role in the opening of the two strands of DNA. We use a simple non-linear model and investigate the role of these cations on the mechanical ...
  • Differential stability of DNA based on salt concentration 
    Singh, Navin (Springer, 2016-05)
    Intracellular positive ions neutralize negative charges on the phosphates of a DNA strand, conferring greater strength on the hydrogen bonds that connect complementary strands into a double helix and so confer enhanced ...
  • Effect of defects on thermal denaturation of DNA oligomers 
    Singh, Navin (APS, 2001-09)
    Effect of defects on the melting profile of short heterogeneous DNA chains is calculated using the Peyrard-Bishop Hamiltonian. On-site potential on a defect site is represented by a potential that has only a short-range ...
  • The probability analysis of opening of DNA 
    Singh, Navin (AIP, 2011-03)
    We have studied the separation of a double stranded DNA (dsDNA), which is driven by either the temperature or force. By monitoring the probability of opening of entire base pairs along the chain, we show that the opening ...
  • Effect of salt concentration on the stability of heterogeneous DNA 
    Singh, Navin (Elsevier, 2015-02)
    We study the role of cations on the stability of double stranded DNA (dsDNA) molecules. It is known that the two strands of double stranded DNA (dsDNA) have negative charge due to phosphate group. Cations in the form of ...
  • Statistical theory of force-induced unzipping of DNA 
    Singh, Navin (Springer, 2005-03)
    The unzipping transition under the influence of external force of a dsDNA molecule has been studied using the Peyrard-Bishop Hamiltonian. The critical force Fc(T) for unzipping calculated in the constant force ensemble is ...
  • Surface Plasmon Resonance Study Of Langmuir-blodgett Films Of Stearic Acid 
    Manjuladevi, V.; Gupta, Raj Kumar (CIB Tech, 2012)
    Stearic acid is one of the commonly studied fatty acid. It exhibits interesting behavior on surfaces. The Langmuir Blodgett films of stearic acid were fabricated on solid substrates. We have developed a surface plasmon ...
  • 14 Ultrathin films of nanomaterials: a lyotropic liquid crystalline system and its sensing application 
    Gupta, Raj Kumar; Manjuladevi, V. (De Gruyter, 2021)
    The ultrathin films of nanomaterials provide remarkable features that can be potentially employed for efficient device fabrication. In this chapter, an overview of ultrathin films of nanomaterials at different interfaces, ...
  • Electrochemical Surface Plasmon Resonance for Efficient Sensing and Analysis 
    Gupta, Raj Kumar; Manjuladevi, V. (CRC Press, 2023)
    The optical phenomenon of surface plasmon resonance (SPR) is widely used for a variety of applications viz. sensing, drug-target interactions and dielectrics in material science. Several sensing applications based on optical ...
  • Periodic array of nanoparticles on gold substrate 
    Gupta, Raj Kumar; Manjuladevi, V. (AIP, 2013-06)
    The thin films of nanoparticles of titanium dioxide were deposited on gold deposited substrates by drop cast method. The films were characterized employing the atomic force microscope in contact mode. We obtained a high ...
  • Scanning tunneling spectroscopy of thin films of carbon nanotubes 
    Gupta, Raj Kumar; Manjuladevi, V. (AIP, 2013)
    The thin films of single walled carbon nanotubes (CNT) were deposited on indium tin oxide (ITO) glass substrates. The films were characterized using scanning tunneling microscopy and spectroscopy. The topographic images ...
  • Studies on Adsorption of DNA on Functional Ultrathin Films of Cationic Surfactant 
    Manjuladevi, V.; Gupta, Raj Kumar (Hindawi Publishing Corporation, 2014-01)
    We have investigated the interaction of DNA with a highly ordered functional ultrathin layer of cationic surfactant, dioctadecyl ammonium bromide (DOAB). The ultrathin film of DOAB is fabricated by Langmuir-Blodgett technique ...
  • Formation of H-type liquid crystal dimer at air-water interface 
    Manjuladevi, V.; Gupta, Raj Kumar (AIP, 2014)
    We have formed the Langmuir monolayer of H-shaped Azo linked liquid crystal dimer molecule at the air-water interface. Isocycles of the molecule showed hysteresis suggesting the ir-reversible nature of the monolayer formed. ...

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