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Browsing MIT Open Access Articles by Title

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  • Bacillus subtilis Class Ib Ribonucleotide Reductase Is a Dimanganese(III)-Tyrosyl Radical Enzyme 
    Zhang, Yan; Stubbe, JoAnne (American Chemical Society (ACS), 2011-05)
    Bacillus subtilis class Ib ribonucleotide reductase (RNR) catalyzes the conversion of nucleotides to deoxynucleotides, providing the building blocks for DNA replication and repair. It is composed of two proteins: α (NrdE) ...
  • The Bacillus subtilis conjugative transposon ICEBs1 mobilizes plasmids lacking dedicated mobilization functions 
    Lee, Catherine Ann; Thomas, Jacob; Grossman, Alan D. (American Society for Microbiology, 2012-04)
    Integrative and conjugative elements (ICEs, also known as conjugative transposons) are mobile elements that are found integrated in a host genome and can excise and transfer to recipient cells via conjugation. ICEs and ...
  • A background-free direction-sensitive neutron detector 
    Roccaro, Alvaro; Tomita, H.; Ahlen, S.; Avery, D.; Inglis, A.; Battat, J.; Dujmic, D.; Henderson, S.; Fisher, Peter H.; Kaboth, A.; Kohse, G.; Lanza, R.; Monroe, J.; Sciolla, G.; Skvorodnev, N.; Wellenstein, H.; Yamamoto, R. (Elsevier, 2009-07)
    We show data from a new type of detector that can be used to determine the neutron flux, the energy distribution, and the direction of motion neutron for both fast and thermal neutrons. Many neutron detectors are plagued ...
  • Background independent action for double field theory 
    Hohm, Olaf; Hull, Chris; Zwiebach, Barton (Springer Berlin / Heidelberg, 2010-07)
    Double field theory describes a massless subsector of closed string theory with both momentum and winding excitations. The gauge algebra is governed by the Courant bracket in certain subsectors of this double field theory. ...
  • The Backseat Control Architecture for Autonomous Robotic Vehicles: A Case Study with the Iver2 AUV 
    Brown, Scott R.; Eickstedt, Donald (Institute of Electrical and Electronics Engineers, 2010-03)
    In this paper, an innovative hybrid control architecture for real-time control of autonomous robotic vehicles is described as well as its implementation on a commercially available autonomous underwater vehicle (AUV). This ...
  • A backward progression of attentional effects in the ventral stream 
    Desimone, Robert; Buffalo, Elizabeth A.; Fries, Pascal; Landman, Rogier; Liang, Hualou (National Academy of Sciences, 2010-01)
    The visual processing of behaviorally relevant stimuli is enhanced through top-down attentional feedback. One possibility is that feedback targets early visual areas first and the attentional enhancement builds up at ...
  • Bacterial Carbon Storage to Value Added Products 
    Brigham, Christopher J.; Kurosawa, Kazuhiko; Rha, ChoKyun; Sinskey, Anthony J. (OMICS Publishing Group, 2011-12)
    PhaR from Paracoccus denitrificans functions as a repressor or autoregulator of the expression of genes encoding phasin protein (PhaP) and PhaR itself, both of which are components of polyhydroxyalkanoate (PHA) granules ...
  • Bacterial chemotaxis towards the extracellular products of the toxic phytoplankton Heterosigma akashiwo 
    Stocker, Roman; Seymour, Justin R.; Ahmed, Tanvir (Oxford University Press, 2009-10)
    Marine bacteria exhibit positive chemotactic responses to the extracellular exudates of the toxic phytoplankton Heterosigma akashiwo. In the environment, this will support bacteria–algae associations with potential ...
  • Bacterial infection causes stress-induced memory dysfunction in mice 
    Gareau, Melanie G.; Wine, Eytan; Rodrigues, David M.; Cho, Joon Ho; Whary, Mark T.; Philpott, Dana J.; MacQueen, Glenda; Sherman, Philip M. (BMJ Publishing, 2010-10)
    Background: The brain–gut axis is a key regulator of normal intestinal physiology; for example, psychological stress is linked to altered gut barrier function, development of food allergies and changes in behaviour. Whether ...
  • Bacterial Rheotaxis 
    Marcos; Fu, Henry C.; Powers, Thomas R.; Stocker, Roman (National Academy of Sciences (U.S.), 2012-03)
    The motility of organisms is often directed in response to environmental stimuli. Rheotaxis is the directed movement resulting from fluid velocity gradients, long studied in fish, aquatic invertebrates, and spermatozoa. ...
  • Balanced dense polynomial multiplication on multi-cores 
    Xie, Yuzhen; Maza, Marc Moreno (Institute of Electrical and Electronics Engineers, 2010-02)
    In symbolic computation, polynomial multiplication is a fundamental operation akin to matrix multiplication in numerical computation. We present efficient implementation strategies for FFT-based dense polynomial multiplication ...
  • Balanced Ero1 activation and inactivation establishes ER redox homeostasis 
    Kim, Sunghwan; Sideris, Polixeni Dionisia; Sevier, Carolyn S.; Kaiser, Chris (Rockefeller University Press, The, 2012-03)
    The endoplasmic reticulum (ER) provides an environment optimized for oxidative protein folding through the action of Ero1p, which generates disulfide bonds, and Pdi1p, which receives disulfide bonds from Ero1p and transfers ...
  • Balanced Increases in Selectivity and Tolerance Produce Constant Sparseness along the Ventral Visual Stream 
    DiCarlo, James; Rust, Nicole C. (Society for Neuroscience, 2012-07)
    Although popular accounts suggest that neurons along the ventral visual processing stream become increasingly selective for particular objects, this appears at odds with the fact that inferior temporal cortical (IT) neurons ...
  • The Balanced Unicast and Multicast Capacity Regions of Large Wireless Networks 
    Niesen, Urs; Gupta, Piyush; Shah, Devavrat (Institute of Electrical and Electronics Engineers, 2010-05)
    We consider the question of determining the scaling of the n[superscript n] -dimensional balanced unicast and the n 2[superscript n]-dimensional balanced multicast capacity regions of a wireless network with n nodes placed ...
  • Balance functions from Au+Au, d+Au, and p+p collisions at √sNN=200 GeV 
    Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross Cameron; Hays-Wehle, James Prewitt; Hoffman, A. M.; Jones, Christopher LaDon; Kocoloski, Adam Philip; Leight, William Axel; Milner, Richard G.; Redwine, Robert P.; Sakuma, Tai; Seele, Joseph Patrick; Surrow, Bernd; van Nieuwenhuizen, Gerrit Jan; Walker, Matthew H. (American Physical Society, 2010-08)
    Balance functions have been measured for charged-particle pairs, identified charged-pion pairs, and identified charged-kaon pairs in Au+Au, d+Au, and p+p collisions at [square root]√sNN=200 GeV at the Relativistic Heavy ...
  • THE BANANA PROJECT. III. SPIN-ORBIT ALIGNMENT IN THE LONG-PERIOD ECLIPSING BINARY NY CEPHEI 
    Albrecht, Simon H.; Winn, Joshua Nathan; Carter, Joshua Adam; Snellen, Ignas A. G.; Mooij, Ernst J. W. de (Institute of Physics Publishing, 2010-12)
    Binaries are not always neatly aligned. Previous observations of the DI Her system showed that the spin axes of both stars are highly inclined with respect to one another and the orbital axis. Here, we report on a measurement ...
  • Band-dependent Quasiparticle Dynamics in Single Crystals of the Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2] Superconductor Revealed by Pump-Probe Spectroscopy 
    Torchinsky, Darius Hosseinzadeh; Chen, G. F.; Luo, J. L.; Wang, N. L.; Gedik, Nuh (American Physical Society, 2010-07)
    We report on band-dependent quasiparticle dynamics in Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2](Tc=37  K) measured using ultrafast pump-probe spectroscopy. In the superconducting state, we observe two ...
  • Bandgap Optimization of Two-Dimensional Photonic Crystals Using Semidefinite Programming and Subspace Methods 
    Men, H.; Nguyen, Ngoc Cuong; Freund, Robert Michael; Parrilo, Pablo A.; Peraire, Jaime (Elsevier, 2010-01)
    In this paper, we consider the optimal design of photonic crystal structures for two-dimensional square lattices. The mathematical formulation of the bandgap optimization problem leads to an infinite-dimensional Hermitian ...
  • Band-phase-randomized surrogate data reveal high-frequency chaos in heart rate variability 
    Li, Cheng; Ding, Guang-Hong; Wu, Guo-Qiang; Poon, Chi-Sang (Institute of Electrical and Electronics Engineers, 2010-08)
    We propose a new band-phase-randomized surrogate data method to evaluate the chaotic dynamics in the high (HF) and low frequency (LF) bands of heart rate variability (HRV) in healthy subjects. The chaotic strength of normal ...
  • Bankruptcy and the Collateral Channel 
    Benmelech, Efraim; Bergman, Nittai (American Finance Association, 2011-03)
    Do bankrupt firms impose negative externalities on their nonbankrupt competitors? We propose and analyze a collateral channel in which a firm’s bankruptcy reduces the collateral value of other industry participants, thereby ...
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