Search Results - (Author, Cooperation:S. Ramakrishnan)

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  1. 1
    S. Hong ; V. F. Beja-Glasser ; B. M. Nfonoyim ; A. Frouin ; S. Li ; S. Ramakrishnan ; K. M. Merry ; Q. Shi ; A. Rosenthal ; B. A. Barres ; C. A. Lemere ; D. J. Selkoe ; B. Stevens
    American Association for the Advancement of Science (AAAS)
    Published 2016
    Staff View
    Publication Date:
    2016-04-02
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    N. Saini ; S. Ramakrishnan ; R. Elango ; S. Ayyar ; Y. Zhang ; A. Deem ; G. Ira ; J. E. Haber ; K. S. Lobachev ; A. Malkova
    Nature Publishing Group (NPG)
    Published 2013
    Staff View
    Publication Date:
    2013-09-13
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    *Chromosome Breakage ; *DNA Breaks, Double-Stranded ; DNA Helicases/metabolism ; DNA Repair/genetics ; DNA Replication/*genetics ; DNA, Fungal/*biosynthesis/genetics ; Genomic Instability/genetics ; Mutagenesis/genetics ; S Phase/genetics ; Saccharomyces cerevisiae/cytology/enzymology/*genetics/metabolism ; Saccharomyces cerevisiae Proteins/metabolism
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Ghosh, K. ; Ramakrishnan, S. ; Nigam, A. K. ; Chandra, Girish

    [S.l.] : American Institute of Physics (AIP)
    Published 1993
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    In this paper we report the upper critical field studies of Sc5−xDyxIr4Si10 (for x=0, 1, 1.5, and 1.75). Analysis of upper critical magnetic fields yields Hc2(0) of 10 and 8.2 kOe for the superconducting samples Sc5Ir4Si10 and Sc4Dy1Ir4Si10, respectively. We obtain the lower values of Hc2(0) of 1.0 and 0.8 kOe for Sc3.5Dy1.5Ir4Si10 and Sc3.25Dy1.75Ir4Si10, respectively, where the coexistence of antiferromagnetism and superconductivity are observed from the measurements of ac susceptibility and resistivity in the presence of dc magnetic field.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.352538

    Articles: DFG German National Licenses
  4. 4
    Patil, N. G. ; Ramakrishnan, S.

    [S.l.] : American Institute of Physics (AIP)
    Published 1999
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Our recent studies on polycrystalline samples of the R5Rh4Sn10 series have shown unusual multiple ordering with a first order magnetic transition in tetragonal Nd5Rh4Sn10 at low temperatures. In this study, we report resistivity, susceptibility, and heat capacity (in various fields up to 10 T) in a single crystal of Nd5Rh4Sn10. We observe antiferromagnetic ordering of Nd3+ spins along the c axis while they order ferromagnetically along the a axis. The first order transition was rapidly suppressed with fields above 4 T along the c axis while it was marginally affected up to 10 T for field along the a axis. We propose a tentative model to explain this feature. © 1999 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.370040

    Articles: DFG German National Licenses
  5. 5
    Mitra, C. ; Dhar, S. K. ; Ramakrishnan, S.

    [S.l.] : American Institute of Physics (AIP)
    Published 2000
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    (TbPd3)8T (T=Ga and Ge) compounds have the cubic, Pm3m symmetry and are a superstructure derivative of the cubic, AuCu3-type, TbPd3. The ternary compounds order antiferromagnetically and the Néel temperature is different from the binary compound TbPd3, which has an antiferromagnetic ordering at 3 K. Two transitions are observed in (TbPd3)8Ge, one at 4 K and the other at 5.2 K. The compound (TbPd3)8Ga has an antiferromagnetic ordering at 5.2 K. The resistivity exhibits hysteresis in the transition regime in both compounds. The magnetic transitions are first-order like and sharp metamagnetic transition is observed below the magnetic ordering temperature in both (TbPd3)8Ga and (TbPd3)8Ge. © 2000 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.373277

    Articles: DFG German National Licenses
  6. 6
    Srivastava, J. K. ; Ramakrishnan, S. ; Marathe, V. R. ; Chandra, G. ; Vijayaraghavan, R. ; Kulkarni, J. A. ; Darshane, V. S. ; Singh, S.

    [S.l.] : American Institute of Physics (AIP)
    Published 1987
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Our ac susceptibility (χ) measurements, carried out between 1.7 and 100 K, show five χ peaks, signaling five transition temperatures, in the disordered frustrated spinel ferrite Co2TiO4. This result, in conjunction with the replica symmetric mean field theory of vector spin glasses and earlier magnetization and neutron diffraction studies, indicates a separate freezing of A- and B-site spins. To our knowledge, such a phenomenon has not been observed before. Co2SnO4 and Co1.2Zn0.8TiO4 χ measurements, where three and one χ peaks are respectively observed, support this picture.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.338692

    Articles: DFG German National Licenses
  7. 7
    Banerjee, S. S. ; Patil, N. G. ; Ramakrishnan, S. ; Grover, A. K.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1999
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    History-dependent metastable states with different bulk properties are formed in the vortex state of the type-II superconductor 2H-NbSe2. Magnetic measurements demonstrate the difference between the shielding responses of a field- and a zero-field-cooled state, and provide a procedure for switching the system from one state to the other. © 1999 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.123139

    Articles: DFG German National Licenses
  8. 8
    Rosenbaum, D. F. ; Kulkarni, Amit ; Ramakrishnan, S. ; Zukoski, C. F.

    College Park, Md. : American Institute of Physics (AIP)
    Published 1999
    Staff View
    ISSN:
    1089-7690
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Chemistry and Pharmacology
    Notes:
    A robust correlation between experimentally determinable parameter, B2/B2HS, and protein solubility is explored. Here B2 is the protein solution second virial coefficient and B2HS=2πσ3/3 is the hard sphere second virial coefficient of the protein whose core is described as a sphere with diameter σ. The origin of this correlation, which extends over three decades in solubility, is discussed in terms of the phase behavior of simple fluids composed of particles experiencing short range attractions. For a given solubility B2/B2HS values cluster in a narrow range for a variety of protein solution conditions. However, the value of B2/B2HS at the metastable fluid/fluid transition remains as sensitive solution conditions. We discuss this sensitivity in terms of phase behavior predicted for particles interacting with the three parameter, square well and Yukawa potentials where metastable critical points are sensitive to the range of attraction. The position of this critical point relative to the solubility boundary and the ease of crystal nucleation are found to depend on solution conditions. © 1999 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.480328

    Articles: DFG German National Licenses
  9. 9
    Ramakrishnan, S. ; Zukoski, C. F.

    College Park, Md. : American Institute of Physics (AIP)
    Published 2000
    Staff View
    ISSN:
    1089-7690
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Chemistry and Pharmacology
    Notes:
    Self-assembly of nanoparticles involves manipulating particle interactions such that attractions are on the order of the average thermal energy in the system. If the self-assembly is to result in an ordered packing, an understanding of their phase behavior is necessary. Here we test the ability of simple pair potentials to characterize the interactions and phase behavior of silico tungstic acid (STA), a 1.2 nm particle. The strength of interaction is controlled by dispersing STA in different background salt concentrations. The experimental variables used in characterizing the interactions are the osmotic compressibility (dΠ/dρ), the second virial coefficient (B2), relative solution viscosity (η/ηc), and the solubility (ρσ3)sat. Various techniques are then developed to extract the parameters of square well, the adhesive hard sphere (AHS), and the Yukawa pair potentials that best describe the experimental data. The AHS model describes the solution thermodynamic behavior only where the system is weakly attractive but, as would be expected, fails when long range repulsions or nonmonotonic pair potentials become important. Model free representations are presented which offer the opportunity to extract pair potential parameters. © 2000 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.481901

    Articles: DFG German National Licenses
  10. 10
    Ramakrishnan, S.

    College Park, Md. : American Institute of Physics (AIP)
    Published 2002
    Staff View
    ISSN:
    1089-7690
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Chemistry and Pharmacology
    Notes:
    The phase behavior of model athermal silica (radius R=50 nm)–polystyrene–toluene suspensions has been determined over nearly two orders of magnitude in polymer or colloid size asymmetry. Fluid–gel, fluid–crystal, and fluid–fluid transitions are observed as Rg, the polymer radius of gyration, increases. Based on the polymer concentration relative to the dilute–semidilute crossover density, cp/cp*, as the relevant measure of depletion attraction, we find that suspension miscibility monotonically improves as Rg increases for all colloid volume fractions. This trend is in contradiction to all classic depletion theories of which we are aware. However, the predictions of fluid–fluid spinodal phase separation by the microscopic polymer reference interaction site model integral equation theory of athermal polymer–colloid suspensions are in agreement with the experimental observations. Polymer–polymer interactions, chain fractal structure, and structural reorganizations are implicated as critical physical factors. A fluid–gel transition is observed in the one-phase region for Rg=0.026R. The recently proposed dynamic mode-coupling theory is found to provide a nearly quantitative prediction of the gel line. With increasing Rg/R, gelation is predicted to require larger values of cp/cp* such that the nonergodicity transition shifts into the metastable region of the phase diagram in agreement with experiment. Comparison of the gelation behavior predicted based on the assumption that it is coincident with the static percolation line is also examined, with mixed results. © 2002 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1426413

    Articles: DFG German National Licenses
  11. 11
    Staff View
    ISSN:
    0304-8853
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0304-8853(92)91694-O

    Articles: DFG German National Licenses
  12. 12
    SINGH, JASWANT ; RAMAKRISHNAN, S. P. ; PRAKASH, SATYA

    [s.l.] : Nature Publishing Group
    Published 1952
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] Precipitin sera have been prepared in the Malaria Institute of India during the past thirteen years as a routine for the determination of the sources of mosquito blood meals. Since 1948, human plasma has been successfully used as an antigen. Twenty-five rabbits and twenty-nine fowls were immunized ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/169157b0

    Articles: DFG German National Licenses
  13. 13
    RAMAKRISHNAN, S. P. ; PRAKASH, SATYA

    [s.l.] : Nature Publishing Group
    Published 1951
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] In the course of studies in these laboratories, the garden squirrel (S. palmarum) has been found to be susceptible to blood-induced infections of P. berghei. In these rodents, unlike mice and some rats, the infection was mild and became chronic. Periods of latency were followed by mild parasitic ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/167533a0

    Articles: DFG German National Licenses
  14. 14
    Staff View
    ISSN:
    0921-4534
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0921-4534(91)91257-5

    Articles: DFG German National Licenses
  15. 15
    Staff View
    ISSN:
    0921-4534
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0921-4534(92)90843-2

    Articles: DFG German National Licenses
  16. 16
    Rajagopal, G. ; Ramakrishnan, S.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0003-2697
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0003-2697(75)90499-6

    Articles: DFG German National Licenses
  17. 17
    Ramakrishnan, S. ; Balasubramanian, K.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0003-2697
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0003-2697(70)90185-5

    Articles: DFG German National Licenses
  18. 18
    Traber, M.G. ; Ramakrishnan, S. ; Kayden, H.J.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0891-5849
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0891-5849(93)90263-T

    Articles: DFG German National Licenses
  19. 19
    Staff View
    ISSN:
    0014-4827
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Medicine
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1006/excr.1993.1200

    Articles: DFG German National Licenses
  20. 20
    Ramakrishnan, S. ; Chandra, G.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0038-1098
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/S0038-1098(85)80035-1

    Articles: DFG German National Licenses