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https://www.readbyqxmd.com/read/27926851/energy-output-from-a-single-outer-hair-cell
#1
Kuni H Iwasa
Electromotility of outer hair cells (OHCs) has been extensively studied with in vitro experiments because of its physiological significance to the cochlear amplifier, which provides the exquisite sensitivity and frequency selectivity of the mammalian ear. However, these studies have been performed largely under load-free conditions or with static load, while these cells function in vivo in a dynamic environment, receiving electrical energy to enhance mechanical oscillation in the inner ear. This gap leaves uncertainties in addressing a key issue, how much mechanical energy an OHC provides...
December 6, 2016: Biophysical Journal
https://www.readbyqxmd.com/read/27926845/membrane-bound-alpha-synuclein-clusters-induce-impaired-lipid-diffusion-and-increased-lipid-packing
#2
Aditya Iyer, Nathalie Schilderink, Mireille M A E Claessens, Vinod Subramaniam
The aggregation of membrane-bound α-synuclein (αS) into oligomers and/or amyloid fibrils has been suggested to cause membrane damage in in vitro model phospholipid membrane systems and in vivo. In this study, we investigate how αS interactions that precede the formation of well-defined aggregates influence physical membrane properties. Using three truncated variants of αS with different aggregation propensities and comparable phospholipid membrane binding affinities we show, using fluorescence recovery after photobleaching (FRAP) and fluorescence anisotropy measurements, that formation of αS clusters on supported lipid bilayers (SLBs) impairs lateral lipid diffusion and increases lipid packing beneath the αS clusters...
December 6, 2016: Biophysical Journal
https://www.readbyqxmd.com/read/27926818/disruption-of-miaa-provides-insights-into-the-regulation-of-phenazine-biosynthesis-under-suboptimal-growth-conditions-in-pseudomonas-chlororaphis-30-84
#3
Jun Myoung Yu, Donping Wang, Leland S Pierson, Elizabeth A Pierson
Many products of secondary metabolism are activated by quorum sensing (QS), yet even at cell densities sufficient for QS, their production may be repressed under suboptimal growth conditions via mechanisms that still require elucidation. For many beneficial plant-associated bacteria, secondary metabolites such as phenazines are important for their competitive survival and plant-protective activities. Previous work established that phenazine biosynthesis in Pseudomonas chlororaphis 30-84 is regulated by the PhzR/PhzI QS system, which in turn is regulated by transcriptional regulator Pip, two-component system RpeA/RpeB, and stationary-phase/stress sigma factor RpoS...
December 7, 2016: Microbiology
https://www.readbyqxmd.com/read/27926758/association-between-surgeon-scorecard-use-and-operating-room-costs
#4
Corinna C Zygourakis, Victoria Valencia, Christopher Moriates, Christy K Boscardin, Sereina Catschegn, Alvin Rajkomar, Kevin J Bozic, Kent Soo Hoo, Andrew N Goldberg, Lawrence Pitts, Michael T Lawton, R Adams Dudley, Ralph Gonzales
Importance: Despite the significant contribution of surgical spending to health care costs, most surgeons are unaware of their operating room costs. Objective: To examine the association between providing surgeons with individualized cost feedback and surgical supply costs in the operating room. Design, Setting, and Participants: The OR Surgical Cost Reduction (OR SCORE) project was a single-health system, multihospital, multidepartmental prospective controlled study in an urban academic setting...
December 7, 2016: JAMA Surgery
https://www.readbyqxmd.com/read/27926732/electric-field-stimulated-protein-mechanics
#5
Doeke R Hekstra, K Ian White, Michael A Socolich, Robert W Henning, Vukica Šrajer, Rama Ranganathan
The internal mechanics of proteins-the coordinated motions of amino acids and the pattern of forces constraining these motions-connects protein structure to function. Here we describe a new method combining the application of strong electric field pulses to protein crystals with time-resolved X-ray crystallography to observe conformational changes in spatial and temporal detail. Using a human PDZ domain (LNX2(PDZ2)) as a model system, we show that protein crystals tolerate electric field pulses strong enough to drive concerted motions on the sub-microsecond timescale...
December 7, 2016: Nature
https://www.readbyqxmd.com/read/27926677/transfemoral-amputation-after-failure-of-knee-arthroplasty-a-nationwide-register-based-study
#6
Tinne B Gottfriedsen, Henrik M Schrøder, Anders Odgaard
BACKGROUND: Transfemoral amputation is considered the last treatment option for failed knee arthroplasty. The extent to which this procedure is performed is not well known. The purpose of this study was to identify the incidence and causes of amputation following failure of knee arthroplasty in a nationwide population. METHODS: Data were extracted from the Danish Civil Registration System, the Danish National Patient Register, and the Danish Knee Arthroplasty Register...
December 7, 2016: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/27926632/a-pooled-analysis-of-robotic-versus-laparoscopic-surgery-for-colon-cancer
#7
Bo-Shi Duan, Guo-Hua Zhao, Helen Yang, Yue Wang
OBJECTIVE: An increasing number of studies have been reported since the "Da Vinci" Robotic System was used in gastrointestinal disease. Thus, we conducted this meta-analysis to evaluate the safety and efficacy of robotic colectomy (RC) compared with laparoscopic colectomy (LC) in the treatment of colon cancer. METHOD: A systematic search of Medline, Embase databases, and the Cochrane Library was performed to identify studies that compared RC and LC and were published up to February 2015...
December 2016: Surgical Laparoscopy, Endoscopy & Percutaneous Techniques
https://www.readbyqxmd.com/read/27926548/liver-transplantation-for-hepatocellular-carcinoma-current-update-on-treatment-and-allocation
#8
Leigh Anne Dageforde, Kathryn J Fowler, William C Chapman
PURPOSE OF REVIEW: This review discusses the current imaging modalities and criteria used to diagnose, and the role of liver transplantation as well as nonsurgical hepatic-directed therapies to treat hepatocellular carcinoma in the setting of chronic liver disease. RECENT FINDINGS: There has been continual evolution of guidelines, policies, and algorithms for the imaging diagnosis of hepatocellular carcinoma, particularly the Liver Imaging Reporting and Data System...
December 6, 2016: Current Opinion in Organ Transplantation
https://www.readbyqxmd.com/read/27926547/liver-redistricting-what-are-the-upcoming-changes-in-liver-allocation-in-the-united-states
#9
Therese Bittermann, David S Goldberg
PURPOSE OF REVIEW: Geographic disparity in liver transplantation is substantial in the United States, and primarily a byproduct of artificially created zones of organ distribution. In 2016, the United Network for Organ Sharing (UNOS) put forward a formal redistricting proposal with the goal of reducing this variability by regrouping the country's 58 donation service areas into eight new districts. This review provides a summary of the redistricting proposal's methodologies, expected results, criticisms and next steps...
December 6, 2016: Current Opinion in Organ Transplantation
https://www.readbyqxmd.com/read/27926540/the-novel-interleukin-1-cytokine-family-members-in-inflammatory-diseases
#10
Madelaine Hahn, Silke Frey, Axel J Hueber
PURPOSE OF REVIEW: This review provides an update on the new interleukin-1 (IL-1) cytokine family members in inflammatory diseases with focus on recent findings concerning the family members IL-36, IL-37, and IL-38 and their different expression patterns. RECENT FINDINGS: The IL-1 cytokines are known to be involved in many different inflammatory and autoimmune diseases. The latest IL-1 family members, IL-36, IL-37, and IL-38 have been shown to be differently regulated during course of disease...
December 6, 2016: Current Opinion in Rheumatology
https://www.readbyqxmd.com/read/27926442/intrinsic-motivation-curiosity-and-learning-theory-and-applications-in-educational-technologies
#11
P-Y Oudeyer, J Gottlieb, M Lopes
This chapter studies the bidirectional causal interactions between curiosity and learning and discusses how understanding these interactions can be leveraged in educational technology applications. First, we review recent results showing how state curiosity, and more generally the experience of novelty and surprise, can enhance learning and memory retention. Then, we discuss how psychology and neuroscience have conceptualized curiosity and intrinsic motivation, studying how the brain can be intrinsically rewarded by novelty, complexity, or other measures of information...
2016: Progress in Brain Research
https://www.readbyqxmd.com/read/27926436/to-work-or-not-to-work-neural-representation-of-cost-and-benefit-of-instrumental-action
#12
N B Kroemer, C Burrasch, L Hellrung
By definition, instrumental actions are performed in order to obtain certain goals. Nevertheless, the attainment of goals typically implies obstacles, and response vigor is known to reflect an integration of subjective benefit and cost. Whereas several brain regions have been associated with cost/benefit ratio decision-making, trial-by-trial fluctuations in motivation are not well understood. We review recent evidence supporting the motivational implications of signal fluctuations in the mesocorticolimbic system...
2016: Progress in Brain Research
https://www.readbyqxmd.com/read/27926380/out-of-hours-workload-management-bayesian-inference-for-decision-support-in-secondary-care
#13
Iker Perez, Michael Brown, James Pinchin, Sarah Martindale, Sarah Sharples, Dominick Shaw, John Blakey
OBJECTIVE: In this paper, we aim to evaluate the use of electronic technologies in out of hours (OoH) task-management for assisting the design of effective support systems in health care; targeting local facilities, wards or specific working groups. In addition, we seek to draw and validate conclusions with relevance to a frequently revised service, subject to increasing pressures. METHODS AND MATERIAL: We have analysed 4 years of digitised demand-data extracted from a recently deployed electronic task-management system, within the Hospital at Night setting in two jointly coordinated hospitals in the United Kingdom...
October 2016: Artificial Intelligence in Medicine
https://www.readbyqxmd.com/read/27925861/modeling-heavy-ion-impairment-of-hippocampal-neurogenesis-after-acute-and-fractionated-irradiation
#14
Eliedonna Cacao, Francis A Cucinotta
Radiation-induced impairment of neurogenesis in the hippocampal dentate gyrus is a concern due to its reported association with cognitive detriments after radiotherapy for brain cancers and the possible risks to astronauts chronically exposed to space radiation. Here, we have extended our recent work in a mouse model of impaired neurogenesis after exposure to low-linear energy transfer (LET) heavy ion radiation. To our knowledge, this is the first report of a predictive mathematical model of radiation-induced changes to neurogenesis for a variety of radiation types after acute or fractionated irradiation...
December 7, 2016: Radiation Research
https://www.readbyqxmd.com/read/27925837/a-comprehensive-multimorbidity-index-for-predicting-mortality-in-intensive-care-unit-patients
#15
Hua Min, Sanja Avramovic, Janusz Wojtusiak, Rahul Khosla, Ross D Fletcher, Farrokh Alemi, Raya Elfadel Kheirbek
BACKGROUND: Accurate prediction of mortality for patients admitted to the intensive care units (ICUs) is an important component of medical care. However, little is known about the role of multimorbidity in predicting end of life for high-risk and vulnerable patients. OBJECTIVE: The aim of the study was to derive and validate a multimorbidity risk model in an attempt to predict all-cause mortality at 6 and 12 months posthospital discharge. METHODS: This is a retrospective, observational, clinical cohort study...
December 7, 2016: Journal of Palliative Medicine
https://www.readbyqxmd.com/read/27925794/endocrine-and-emotional-response-to-exclusion-among-women-and-men-cortisol-salivary-alpha-amylase-and-mood
#16
Liat Helpman, Julia Penso, Orna Zagoory-Sharon, Ruth Feldman, Eva Gilboa-Schechtman
BACKGROUND AND OBJECTIVES: Social exclusion is ubiquitous and painful. Evolutionary models indicate sex differences in coping with social stress. Recent empirical data suggests different sex patterns in hypothalamic-pituitary-adrenal (HPA) and sympathetic-adrenal-medullary (SAM) reactivity. The present study sought to test this hypothesis. DESIGN: We examined differences in endocrine and emotional response to exclusion by using a virtual ball tossing paradigm (Cyberball)...
December 7, 2016: Anxiety, Stress, and Coping
https://www.readbyqxmd.com/read/27925737/generalized-kapchinskij-vladimirskij-distribution-and-beam-matrix-for-phase-space-manipulations-of-high-intensity-beams
#17
Moses Chung, Hong Qin, Ronald C Davidson, Lars Groening, Chen Xiao
In an uncoupled linear lattice system, the Kapchinskij-Vladimirskij (KV) distribution formulated on the basis of the single-particle Courant-Snyder invariants has served as a fundamental theoretical basis for the analyses of the equilibrium, stability, and transport properties of high-intensity beams for the past several decades. Recent applications of high-intensity beams, however, require beam phase-space manipulations by intentionally introducing strong coupling. In this Letter, we report the full generalization of the KV model by including all of the linear (both external and space-charge) coupling forces, beam energy variations, and arbitrary emittance partition, which all form essential elements for phase-space manipulations...
November 25, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27925735/continuous-time-discrete-distribution-theory-for-activity-driven-networks
#18
Lorenzo Zino, Alessandro Rizzo, Maurizio Porfiri
Activity-driven networks are a powerful paradigm to study epidemic spreading over time-varying networks. Despite significant advances, most of the current understanding relies on discrete-time computer simulations, in which each node is assigned an activity potential from a continuous distribution. Here, we establish a continuous-time discrete-distribution framework toward an analytical treatment of the epidemic spreading, from its onset to the endemic equilibrium. In the thermodynamic limit, we derive a nonlinear dynamical system to accurately model the epidemic spreading and leverage techniques from the fields of differential inclusions and adaptive estimation to inform short- and long-term predictions...
November 25, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27925731/late-time-mixing-sensitivity-to-initial-broadband-surface-roughness-in-high-energy-density-shear-layers
#19
K A Flippo, F W Doss, J L Kline, E C Merritt, D Capelli, T Cardenas, B DeVolder, F Fierro, C M Huntington, L Kot, E N Loomis, S A MacLaren, T J Murphy, S R Nagel, T S Perry, R B Randolph, G Rivera, D W Schmidt
Using a large volume high-energy-density fluid shear experiment (8.5  cm^{3}) at the National Ignition Facility, we have demonstrated for the first time the ability to significantly alter the evolution of a supersonic sheared mixing layer by controlling the initial conditions of that layer. By altering the initial surface roughness of the tracer foil, we demonstrate the ability to transition the shear mixing layer from a highly ordered system of coherent structures to a randomly ordered system with a faster growing mix layer, indicative of strong mixing in the layer at a temperature of several tens of electron volts and at near solid density...
November 25, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27925722/realization-of-the-haldane-kane-mele-model-in-a-system-of-localized-spins
#20
Se Kwon Kim, Héctor Ochoa, Ricardo Zarzuela, Yaroslav Tserkovnyak
We study a spin Hamiltonian for spin-orbit-coupled ferromagnets on the honeycomb lattice. At sufficiently low temperatures supporting the ordered phase, the effective Hamiltonian for magnons, the quanta of spin-wave excitations, is shown to be equivalent to the Haldane model for electrons, which indicates the nontrivial topology of the band and the existence of the associated edge state. At high temperatures comparable to the ferromagnetic-exchange strength, we take the Schwinger-boson representation of spins, in which the mean-field spinon band forms a bosonic counterpart of the Kane-Mele model...
November 25, 2016: Physical Review Letters
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