Now showing items 2190-2209 of 5118

    • K-point longitudinal acoustic phonons are responsible for ultrafast intervalley scattering in monolayer MoSe2 

      Bae, Soungmin; Matsumoto, Kana; Raebiger, Hannes; Shudo, Ken-ichi; Kim, Yong-Hoon; (2022)
      In transition metal dichalcogenides, valley depolarization through intervalley carrier scattering by zone-edge phonons is often unavoidable. Although valley depolarization processes related to various acoustic phonons have been suggested, their optical verification is still vague due to nearly degenerate phonon frequencies on acoustic phonon branches ...
    • K2ᅠReveals Pulsed Accretion Driven by the 2 Myr Old Hot Jupiter CI Tau b 

      Biddle, Lauren I.; Johns-Krull, Christopher M.; Llama, Joe; Prato, Lisa; Skiff, Brian A. (2018)
      CIᅠTau is a young (~2 Myr) classical T Tauri star located in the Taurus star-forming region. Radial velocity observations indicate it hosts a Jupiter-sized planet with an orbital period of approximately 9 days. In this work, we analyze time series of CIᅠTau's photometric variability as seen byᅠK2. The light curve reveals the stellar rotation period ...
    • Kagome fiber based ultrafast laser microsurgery probe delivering micro-Joule pulse energies 

      Subramanian, Kaushik; Gabay, Ilan; Ferhanoğlu, Onur; Shadfan, Adam; Pawlowski, Michal; (2016)
      We present the development of a 5 mm, piezo-actuated, ultrafast laser scalpel for fast tissue microsurgery. Delivery of micro-Joules level energies to the tissue was made possible by a large, 31 μm, air-cored inhibited-coupling Kagome fiber. We overcome the fiber’s low NA by using lenses made of high refractive index ZnS, which produced an optimal ...
    • KAT2A coupled with the α-KGDH complex acts as a histone H3 succinyltransferase 

      Wang, Yugang; Guo, Yusong R.; Liu, Ke; Yin, Zheng; Liu, Rui; (2017)
      Histone modifications, such as the frequently occurring lysine succinylation1,2, are central to the regulation of chromatin-based processes. However, the mechanism and functional consequences of histone succinylation are unknown. Here we show that the α-ketoglutarate dehydrogenase (α-KGDH) complex is localized in the nucleus in human cell lines and ...
    • Keeping the rhythm: light/dark cycles during postharvest storage preserve the tissue integrity and nutritional content of leafy plants 

      (2015)
      Background: The modular body structure of plants enables detached plant organs, such as postharvest fruits and vegetables, to maintain active responsiveness to environmental stimuli, including daily cycles of light and darkness. Twenty-four hour light/darkness cycles entrain plant circadian clock rhythms, which provide advantage to plants. Here, we ...
    • Killing Shakespeare's Children: The Cases of Richard III and King John 

      Campana, Joseph (2007)
      This essay explores a series of affective, sexual and temporal disturbances that Shakespeare's child characters create on the early modern stage and that lead these characters often to their deaths. It does so by turning to the murdered princes of Richard III and the ultimately extinguished boy-king Arthur of King John. A pervasive sentimentality ...
    • Kin discrimination and possible cryptic species in the social amoeba Polysphondylium violaceum 

      Kalla, Sara E; Queller, David C; Lasagni, Andrea; Strassmann, Joan E (2011)
      Abstract Background The genetic diversity of many protists is unknown. The differences that result from this diversity can be important in interactions among individuals. The social amoeba Polysphondylium violaceum, which is a member of the Dictyostelia, has a social stage where individual amoebae ...
    • Kinesthetic Feedback during 2DOF Wrist Movements via a Novel MR-Compatible Robot 

      Erwin, Andrew; O’Malley, Marcia K.; Ress, David; Sergi, Fabrizio (2016)
      We demonstrate the interaction control capabilities of the MR-SoftWrist, a novel MR-compatible robot capable of applying accurate kinesthetic feedback to wrist pointing movements executed during fMRI. The MR-SoftWrist, based on a novel design that combines parallel piezoelectric actuation with compliant force feedback, is capable of delivering 1.5 ...
    • Knockout of hyaluronan synthase 1, but not 3, impairs formation of the retrocalcaneal bursa 

      Sikes, Katie J.; Renner, Kristen; Li, Jun; Grande‐Allen, K. Jane; Connell, Jennifer P.; (2018)
      Hyaluronan (HA), a high molecular weight non‐sulfated glycosaminoglycan, is an integral component of the extracellular matrix of developing and mature connective tissues including tendon. There are few published reports quantifying HA content during tendon growth and maturation, or detailing its effects on the mechanical properties of the tendon ...
    • Knot Concordance and Homology Cobordism 

      (2013-06)
      We consider the question: “If the zero-framed surgeries on two oriented knots in S3 are Z-homology cobordant, preserving the homology class of the positive meridians, are the knots themselves concordant?” We show that this question has a negative answer in the smooth category, even for topologically slice knots. To show this we first prove that the ...
    • Kondo Destruction and Quantum Criticality in Kondo Lattice Systems 

      Si, Qimiao; Pixley, Jedediah H.; Nica, Emilian; Yamamoto, Seiji J.; Goswami, Pallab; (2014)
      Considerable efforts have been made in recent years to theoretically understand quantum phase transitions in Kondo lattice systems. A particular focus is on Kondo destruction, which leads to quantum criticality that goes beyond the Landau framework of order-parameter fluctuations. This unconventional quantum criticality has provided an understanding ...
    • Kondo Destruction and Valence Fluctuations in an Anderson Model 

      (2012)
      Unconventional quantum criticality in heavy-fermion systems has been extensively analyzed in terms of a critical destruction of the Kondo effect. Motivated by a recent demonstration of quantum criticality in a mixed-valent heavy-fermion system, -YbAlB4, we study a particle-hole-asymmetric Anderson impurity model with a pseudogapped density of states. ...
    • Kondo destruction in a quantum paramagnet with magnetic frustration 

      Zhang, Jiahao; Zhao, Hengcan; Lv, Meng; Hu, Sile; Isikawa, Yosikazu; (2018)
      We report results of isothermal magnetotransport and susceptibility measurements at elevated magnetic fields B down to very low temperatures T on single crystals of the frustrated Kondo-lattice system CePdAl. They reveal a B∗(T) line within the paramagnetic part of the phase diagram. This line denotes a thermally broadened “small”–to-“large” Fermi-surface ...
    • Kondo hybridization and quantum criticality in β−YbAlB4 by laser ARPES 

      Bareille, Cédric; Suzuki, Shintaro; Nakayama, Mitsuhiro; Kuroda, Kenta; Nevidomskyy, Andriy H.; (2018)
      We report an angle-resolved photoemission (ARPES) study of β−YbAlB4, which is known to harbor unconventional quantum criticality (QC) without any tuning. We directly observe a quasiparticle peak (QP) emerging from hybridization, characterized by a binding energy and an onset of coherence both at about 4 meV. This value conforms with a previously ...
    • Kondo Insulator to Semimetal Transformation Tuned by Spin-Orbit Coupling 

      Dzsaber, S.; Prochaska, L.; Sidorenko, A.; Eguchi, G.; Svagera, R.; (2017)
      Recent theoretical studies of topologically nontrivial electronic states in Kondo insulators have pointed to the importance of spin-orbit coupling (SOC) for stabilizing these states. However, systematic experimental studies that tune the SOC parameter λ SOC in Kondo insulators remain elusive. The main reason is that variations of (chemical) ...
    • La Niña-driven flooding in the Indo-Pacific warm pool during the past millennium 

      Rodysill, Jessica R.; Russell, James M.; Vuille, Mathias; Dee, Sylvia; Lunghino, Brent; (2019)
      Extreme precipitation events are one of the most consequential components of climate change for society. The El Niño-Southern Oscillation (ENSO) is the dominant mode of precipitation variability in the tropics and causes severe flooding and drought in many socioeconomically vulnerable regions. It remains unclear how tropical rainfall extremes and ...
    • Label-free as-grown double wall carbon nanotubes bundles for Salmonella typhimurium immunoassay 

      Punbusayakul, Niramol; Talapatra, Saikat; Ajayan, Pulickel M; Surareungchai, Werasak (2013)
      Background: A label-free immunosensor from as-grown double wall carbon nanotubes (DW) bundles was developed for detecting Salmonella typhimurium. The immunosensor was fabricated by using the as-grown DW bundles as an electrode material with an anti-Salmonella impregnated on the surface. The immunosensor was electrochemically characterized by cyclic ...
    • Labeling Stem Cells with a New Hybrid Bismuth/Carbon Nanotube Contrast Agent for X-Ray Imaging 

      Hernández-Rivera, Mayra; Cho, Stephen Y.; Moghaddam, Sakineh E.; Cheong, Benjamin Y.; Cabreira-Hansen, Maria da Graça; (2019)
      The poor retention and survival of cells after transplantation to solid tissue represent a major obstacle for the effectiveness of stem cell-based therapies. The ability to track stem cells in vivo can lead to a better understanding of the biodistribution of transplanted cells, in addition to improving the analysis of stem cell therapies’ outcomes. ...
    • Laboratory investigation of co-precipitation of CaCO3/BaCO3 mineral scale solids at oilfield operating conditions: Impact of brine chemistry 

      Zhang, Zhang; Kan, Amy T.; Tomson, Mason B.; Zhang, Ping (2020)
      Oilfield mineral scale deposition can become severe flow assurance challenge especially for offshore deepwater productions. Hazards arising from scale formation and subsequent deposition include production system throughput reduction and eventually blockage. Among various types of scales, carbonates are among the most frequently observed scales in ...
    • Lactose repressor hinge domain independently binds DNA 

      Xu, Joseph S.; Hewitt, Madeleine N.; Gulati, Jaskeerat S.; Cruz, Matthew A.; Zhan, Hongli; (2018)
      The short 8–10 amino acid “hinge” sequence in lactose repressor (LacI), present in other LacI/GalR family members, links DNA and inducer‐binding domains. Structural studies of full‐length or truncated LacI‐operator DNA complexes demonstrate insertion of the dimeric helical “hinge” structure at the center of the operator sequence. This association ...