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Papers by Sudipta Das

Research paper thumbnail of Wide-angle X-ray scattering and molecular dynamics simulations of supercooled protein hydration water

Physical Chemistry Chemical Physics

We investigate hydrated proteins by decomposing the water and protein components and we observe t... more We investigate hydrated proteins by decomposing the water and protein components and we observe that the protein signal is nearly temperature independent, whereas that of hydration water exhibits a trend similar to bulk water.

Research paper thumbnail of Performance of Linear Arrays with Travelling Wave Current Distribution

2011 International Conference on Devices and Communications (ICDeCom), 2011

Abstract—Antenna arrays are generally formed by assembly of radiating elements kept in a particul... more Abstract—Antenna arrays are generally formed by assembly of radiating elements kept in a particular geometrical fashion. If the elements are kept in linear fashion then array is known as linear array and if same are kept in circular fashion then array known as circular array and so on. Most ...

Research paper thumbnail of Naphthalene based highly selective OFF–ON–OFF type fluorescent probe for Al3+ and NO2− ions for living cell imaging at physiological pH

Inorganica Chimica Acta, 2013

A naphthalene based fluorescent probe, 1-((Z)-(naphthalene-4-ylimino)methyl)naphthalene-2-ol (L) ... more A naphthalene based fluorescent probe, 1-((Z)-(naphthalene-4-ylimino)methyl)naphthalene-2-ol (L) has been synthesized by condensing 1-naphthyl amine with 2-hydroxy naphthaldehyde. The structure of L has been established by single crystal X-ray structure. It selectively binds Al 3+ with a binding constant (K a) of 1.83 Â 10 5 M À1/2 and detection limit of 1.0 Â 10 À7 M. Moreover, [L-Al 3+ ] complex can detect NO 2 À ion as low as 5.7 Â 10 À8 M. Binding of L to Al 3+ and [L-Al 3+ ] complex to NO 2 À ion has been established by different spectroscopic studies. The probe is very effective for detection of intracellular Al 3+ through fluorescence microscopic imaging.

Research paper thumbnail of Generalized Particle Dynamics: Modifying the Motion of Particles and Branes

Journal of High Energy …, 2009

We construct a generalized dynamics for particles moving in a symmetric spacetime, i.e. a space-t... more We construct a generalized dynamics for particles moving in a symmetric spacetime, i.e. a space-time admitting one or more Killing vectors. The generalization implies that the effective mass of particles becomes dynamical. We apply this generalized dynamics to the motion of test particles in a static, spherically symmetric metric. A significant consequence of the new framework is to generate an effective negative pressure on a cosmological surface whose expansion is manifest by the particle trajectory via embedding geometry [5, 7, 15, 16]. This formalism thus may give rise to a source for dark energy in modelling the late accelerating universe.

Research paper thumbnail of Wide-angle X-ray scattering and molecular dynamics simulations of supercooled protein hydration water

Physical Chemistry Chemical Physics

We investigate hydrated proteins by decomposing the water and protein components and we observe t... more We investigate hydrated proteins by decomposing the water and protein components and we observe that the protein signal is nearly temperature independent, whereas that of hydration water exhibits a trend similar to bulk water.

Research paper thumbnail of Performance of Linear Arrays with Travelling Wave Current Distribution

2011 International Conference on Devices and Communications (ICDeCom), 2011

Abstract—Antenna arrays are generally formed by assembly of radiating elements kept in a particul... more Abstract—Antenna arrays are generally formed by assembly of radiating elements kept in a particular geometrical fashion. If the elements are kept in linear fashion then array is known as linear array and if same are kept in circular fashion then array known as circular array and so on. Most ...

Research paper thumbnail of Naphthalene based highly selective OFF–ON–OFF type fluorescent probe for Al3+ and NO2− ions for living cell imaging at physiological pH

Inorganica Chimica Acta, 2013

A naphthalene based fluorescent probe, 1-((Z)-(naphthalene-4-ylimino)methyl)naphthalene-2-ol (L) ... more A naphthalene based fluorescent probe, 1-((Z)-(naphthalene-4-ylimino)methyl)naphthalene-2-ol (L) has been synthesized by condensing 1-naphthyl amine with 2-hydroxy naphthaldehyde. The structure of L has been established by single crystal X-ray structure. It selectively binds Al 3+ with a binding constant (K a) of 1.83 Â 10 5 M À1/2 and detection limit of 1.0 Â 10 À7 M. Moreover, [L-Al 3+ ] complex can detect NO 2 À ion as low as 5.7 Â 10 À8 M. Binding of L to Al 3+ and [L-Al 3+ ] complex to NO 2 À ion has been established by different spectroscopic studies. The probe is very effective for detection of intracellular Al 3+ through fluorescence microscopic imaging.

Research paper thumbnail of Generalized Particle Dynamics: Modifying the Motion of Particles and Branes

Journal of High Energy …, 2009

We construct a generalized dynamics for particles moving in a symmetric spacetime, i.e. a space-t... more We construct a generalized dynamics for particles moving in a symmetric spacetime, i.e. a space-time admitting one or more Killing vectors. The generalization implies that the effective mass of particles becomes dynamical. We apply this generalized dynamics to the motion of test particles in a static, spherically symmetric metric. A significant consequence of the new framework is to generate an effective negative pressure on a cosmological surface whose expansion is manifest by the particle trajectory via embedding geometry [5, 7, 15, 16]. This formalism thus may give rise to a source for dark energy in modelling the late accelerating universe.

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