Now showing items 10872-10891 of 34899

    • Fetal hepatic progenitors support long-term expansion of hematopoietic stem cells 

      Chou, Song; Flygare, Johan; Lodish, Harvey F. (Elsevier, 2013-02)
      We have developed a coculture system that establishes DLK[superscript +] fetal hepatic progenitors as the authentic supportive cells for expansion of hematopoietic stem (HSCs) and progenitor cells. In 1-week cultures ...
    • Fetal liver hepatic progenitors are supportive stromal cells for hematopoietic stem cells 

      Chou, Song; Lodish, Harvey F. (National Academy of Sciences, 2010-03)
      Previously we showed that the ~2% of fetal liver cells reactive with an anti-CD3ε monoclonal antibody support ex vivo expansion of both fetal liver and bone marrow hematopoietic stem cells (HSCs); these cells express two ...
    • Fetuin-A/Albumin-Mineral Complexes Resembling Serum Calcium Granules and Putative Nanobacteria: Demonstration of a Dual Inhibition-Seeding Concept 

      Young, David Y.; Young, John D.; Martel, Jan; Wu, Cheng-Yeu (Public Library of Science, 2009-11)
      Serum-derived granulations and purported nanobacteria (NB) are pleomorphic apatite structures shown to resemble calcium granules widely distributed in nature. They appear to be assembled through a dual inhibitory-seeding ...
    • A Feud that Wasn't: Acetylcholine Evokes Dopamine Release in the Striatum 

      Surmeier, D. James; Graybiel, Ann M. (Elsevier, 2012-07)
      In this issue of Neuron, Threlfell et al. (2012) report that synchronous activation of cholinergic interneurons evokes striatal dopamine release by activating presynaptic nicotinic acetylcholine receptors. These findings ...
    • Few distinct distances implies no heavy lines or circles 

      Sheffer, Adam; Zahl, Joshua; de Zeeuw, Frank (Springer Berlin Heidelberg, 2014-10)
      We study the structure of planar point sets that determine a small number of distinct distances. Specifically, we show that if a set PP of n points determines o(n) distinct distances, then no line contains Ω(n[superscript ...
    • Few photon switching with slow light in hollow fiber 

      Vuletic, Vladan; Peyronel, Thibault Michel Max; Lukin, M. D.; Zibrov, A. S.; Hafezi, Mohammad; e.a. (The International Society for Optical Engineering, 2009-02)
      Cold atoms confined inside a hollow-core photonic-crystal fiber with core diameters of a few photon wavelengths are a promising medium for studying nonlinear optical interactions at extremely low light levels. The high ...
    • Few photon switching with slow light in hollow fiber 

      Bajcsy, Michal; Hofferberth, Sebastian; Balic, Vlatko; Peyronel, Thibault Michel Max; Zibrov, A. S.; e.a. (Society of Photo-Optical Instrumentation Engineers, 2009-02)
      Cold atoms confined inside a hollow-core photonic-crystal fiber with core diameters of a few photon wavelengths are a promising medium for studying nonlinear optical interactions at extremely low light levels. The high ...
    • The fewest clues problem 

      Fermi, Ma; Schvartzman, Ariel; Waingarten, Erik; Demaine, Erik D; Aaronson, Scott (Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik, 2016-06)
      When analyzing the computational complexity of well-known puzzles, most papers consider the algorithmic challenge of solving a given instance of (a generalized form of) the puzzle. We take a different approach by analyzing ...
    • Feynman diagrams versus Fermi-gas Feynman emulator 

      Ku, Mark Jen-Hao; Sommer, Ariel Tjodolv; Cheuk, Lawrence W.; Zwierlein, Martin Wolfram; Houcke, K. Van; e.a. (Nature Publishing Group, 2012-03)
      Precise understanding of strongly interacting fermions, from electrons in modern materials to nuclear matter, presents a major goal in modern physics. However, the theoretical description of interacting Fermi systems is ...
    • Feynman quadrics-motive of the massive sunset graph 

      Marcolli, Matilde; Tabuada, Gonçalo (Elsevier BV, 2019-02)
      We prove that the Feynman quadrics-motive of the massive sunset graph is “generic” not mixed-Tate. Moreover, we explicitly describe its “extra” complexity in terms of a Prym variety.
    • FFRob: An Efficient Heuristic for Task and Motion Planning 

      Garrett, Caelan Reed; Lozano-Perez, Tomas; Kaelbling, Leslie P (Springer Cham, 2015-04)
      Manipulation problemsinvolvingmany objects present substantial challenges for motion planning algorithms due to the high dimensionality and multi-modality of the search space. Symbolic task planners can efficiently construct ...
    • An FFT-Based Companding Front End for Noise-Robust Automatic Speech Recognition 

      Raj, Bhiksha; Turicchia, Lorenzo; Schmidt-Nielsen, Bent; Sarpeshkar, Rahul (Hindawi Publishing Corporation, 2007-06)
      We describe an FFT-based companding algorithm for preprocessing speech before recognition. The algorithm mimics tone-to-tone suppression and masking in the auditory system to improve automatic speech recognition performance ...
    • FGF Regulates TGF-β Signaling and Endothelial-to-Mesenchymal Transition via Control of let-7 miRNA Expression 

      Chen, Pei-Yu; Qin, Lingfeng; Barnes, Carmen; Charisse, Klaus; Yi, Tai; e.a. (Elsevier, 2012-11)
      Maintenance of normal endothelial function is critical to various aspects of blood vessel function, but its regulation is poorly understood. In this study, we show that disruption of baseline fibroblast growth factor (FGF) ...
    • Fiat: Deductive Synthesis of Abstract Data Types in a Proof Assistant 

      Delaware, Benjamin James; Pit-Claudel, Clement F.; Gross, Jason S.; Chlipala, Adam (Association for Computing Machinery, 2015-01)
      We present Fiat, a library for the Coq proof assistant supporting refinement of declarative specifications into efficient functional programs with a high degree of automation. Each refinement process leaves a proof trail, ...
    • Fiber architecture in remodeled myocardium revealed with a quantitative diffusion CMR tractography framework and histological validation 

      Mekkaoui, Choukri; Huang, Shuning; Chen, Howard H.; Dai, Guangping; Reese, Timothy G; e.a. (BioMed Central Ltd, 2012-10)
      Background: The study of myofiber reorganization in the remote zone after myocardial infarction has been performed in 2D. Microstructural reorganization in remodeled hearts, however, can only be fully appreciated by ...
    • Fiber bundle fluorescence endomicroscopy 

      Tsai, Tsung-Han; Zhou, Chao; Fujimoto, James G. (Institute of Electrical and Electronics Engineers (IEEE), 2010-07)
      An improved design for fiber bundle fluorescence endomicroscopy is demonstrated. Scanned illumination and detection using coherent fiber bundles with 30,000 elements with 3 μm resolution enables high speed imaging with ...
    • Fiber draw synthesis 

      Orf, Nicholas D.; Shapira, Ofer; Sorin, Fabien; Danto, Sylvain; Baldo, Marc A.; e.a. (National Academy of Sciences (U.S.), 2011-03)
      The synthesis of a high-melting temperature semiconductor in a low-temperature fiber drawing process is demonstrated, substantially expanding the set of materials that can be incorporated into fibers. Reagents in the solid ...
    • Fiber link design for the NASA-NSF extreme precision Doppler spectrograph concept "WISDOM" 

      Pawluczyk, Rafal; Fournier, Paul; Simcoe, Robert (2017-04-27)
      We describe the design of the fiber-optic coupling and light transfer system of the WISDOM (WIYN Spectrograph for DOppler Monitoring) instrument. As a next-generation Precision Radial Velocity (PRV) spectrometer, WISDOM ...
    • Fiber-Coupled Diamond Micro-Waveguides toward an Efficient Quantum Interface for Spin Defect Centers 

      Schroder, Tim; Zheng, Jiabao; Mouradian, Sara L.; Englund, Dirk R. (American Chemical Society (ACS), 2017-10)
      We report the direct integration and efficient coupling of nitrogen vacancy (NV) color centers in diamond nanophotonic structures into a fiber-based photonic architecture at cryogenic temperatures. NV centers are embedded ...
    • Fiber-coupled nanowire photon counter at 1550 nm with 24% system detection efficiency 

      Hu, Xiaolong; Zhong, Tian; White, James E.; Dauler, Eric A.; Najafi, Faraz; e.a. (Optical Society of America, 2009-11)
      We developed a fiber-coupled superconducting nanowire single-photon detector system in a close-cycled cryocooler and achieved 24% and 22% system detection efficiencies at wavelengths of 1550 and 1315 nm, respectively. The ...