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https://www.readbyqxmd.com/read/28214390/robust-peptidoglycan-growth-by-dynamic-and-variable-multi-protein-complexes
#1
REVIEW
Manuel Pazos, Katharina Peters, Waldemar Vollmer
In Gram-negative bacteria such as Escherichia coli the peptidoglycan sacculus resides in the periplasm, a compartment that experiences changes in pH value, osmolality, ion strength and other parameters depending on the cell's environment. Hence, the cell needs robust peptidoglycan growth mechanisms to grow and divide under different conditions. Here we propose a model according to which the cell achieves robust peptidoglycan growth by employing dynamic multi-protein complexes, which assemble with variable composition from freely diffusing sets of peptidoglycan synthases, hydrolases and their regulators, whereby the composition of the active complexes depends on the cell cycle state - cell elongation or division - and the periplasmic growth conditions...
February 15, 2017: Current Opinion in Microbiology
https://www.readbyqxmd.com/read/28207779/self-organized-synchronization-of-digital-phase-locked-loops-with-delayed-coupling-in-theory-and-experiment
#2
Lucas Wetzel, David J Jörg, Alexandros Pollakis, Wolfgang Rave, Gerhard Fettweis, Frank Jülicher
Self-organized synchronization occurs in a variety of natural and technical systems but has so far only attracted limited attention as an engineering principle. In distributed electronic systems, such as antenna arrays and multi-core processors, a common time reference is key to coordinate signal transmission and processing. Here we show how the self-organized synchronization of mutually coupled digital phase-locked loops (DPLLs) can provide robust clocking in large-scale systems. We develop a nonlinear phase description of individual and coupled DPLLs that takes into account filter impulse responses and delayed signal transmission...
2017: PloS One
https://www.readbyqxmd.com/read/28207279/angiotensin-converting-inhibitors-and-angiotensin-ii-receptor-blockers-and-longitudinal-change-in-percent-emphysema-on-computed-tomography-the-mesa-lung-study
#3
Megha A Parikh, Carrie P Aaron, Eric A Hoffman, Joseph E Schwartz, Jaime Madrigano, John H M Austin, Ravi Kalhan, Gina Lovasi, Karol Watson, Karen Hinckley Stukovsky, R Graham Barr
RATIONALE: Chronic obstructive pulmonary disease (COPD) is the third-leading cause of death in the United States. Emphysema on computed tomography (CT) is associated with increased morbidity and mortality in patients with and without spirometrically defined COPD but no available medications target emphysema.  Transforming growth factor beta (TGF-β) and endothelial dysfunction are implicated in emphysema pathogenesis, and angiotensin II receptor blockers (ARB) inhibit TGF-β, improve endothelial function and restore airspace architecture in murine models...
February 16, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28205603/influences-of-volcano-eruptions-on-asian-summer-monsoon-over-the-last-110-years
#4
Liang Ning, Jian Liu, Weiyi Sun
Asian summer monsoon (ASM) precipitation is the primary water resource for agriculture in many Asian countries that have experienced rapid economic growth in recent decades, thus implying the necessity for further investigations on both the internal variability of the ASM and the influence of external factors on the ASM. Using long-term high-resolution (0.5° × 0.5°) observed precipitation data, contrary to previous studies on inter-annual timescale, we showed that over the last 110 years, volcanic eruptions have influenced ASM variations on an inter-decadal timescale via teleconnections with the Atlantic Multi-decadal Oscillation (AMO)...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28205511/controllable-quantized-conductance-for-multilevel-data-storage-applications-using-conductive-bridge-random-access-memory
#5
Fekadu Gochole Aga, Jiyong Woo, Jeonghwan Song, Jaehyuk Park, Seokjae Lim, Changhyuck Sung, Hyunsang Hwang
In this paper, we investigate the quantized conduction behavior of conductive bridge random access memory (CBRAM) with varied materials and ramping rates. We report stable and reproducible quantized conductance states with integer multiples of fundamental conductance obtained by optimizing the voltage ramping rate and the Ti-diffusion barrier (DB) at the Cu/HfO2 interface. Owing to controlled diffusion of Cu ions by the Ti-DB and the optimized ramping rate, through which it was possible to control the time delay of Cu ion reduction, more than seven levels of discrete conductance states were clearly observed...
February 16, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28201910/mode-specific-excited-state-dynamics-study-of-bis-phenylethynyl-benzene-from-ultrafast-raman-loss-spectroscopy
#6
Khokan Roy, Surajit Kayal, Freek Ariese, Andrew Beeby, Siva Umapathy
Femtosecond transient absorption (fs-TA) and Ultrafast Raman Loss Spectroscopy (URLS) have been applied to reveal the excited state dynamics of bis(phenylethynyl)benzene (BPEB), a model system for one-dimensional molecular wires that have numerous applications in opto-electronics. It is known from the literature that in the ground state BPEB has a low torsional barrier, resulting in a mixed population of rotamers in solution at room temperature. For the excited state this torsional barrier had been calculated to be much higher...
February 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28201887/a-corresponding-states-analysis-of-the-liquid-vapor-equilibrium-properties-of-common-water-models
#7
Malte Fugel, Volker C Weiss
Many atomistic potential models have been proposed to reproduce the properties of real water and to capture as many of its anomalies as possible. The large number of different models indicates that this task is by no means an easy one. Some models are reasonably successful for various properties, while others are designed to account for only a very few specific features of water accurately. Among the most popular models are SPC/E, TIP4P, TIP4P/2005, TIP4P/Ice, and TIP5P-E. Here, we report the equilibrium properties of the liquid-vapor coexistence, such as the densities of the liquid phase and the vapor phase, the interfacial tension between them, and the vapor pressure at saturation...
February 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28198893/elucidating-light-induced-charge-accumulation-in-an-artificial-analogue-of-methane-monooxygenase-enzymes-using-time-resolved-x-ray-absorption-spectroscopy
#8
Dooshaye Moonshiram, Antonio Picón, Alvaro Vazquez-Mayagoitia, Xiaoyi Zhang, Ming-Feng Tu, Pablo Garrido-Barros, Jean-Pierre Mahy, Frédéric Avenier, Ally Aukauloo
We report the use of time-resolved X-ray absorption spectroscopy in the ns-μs time scale to track the light induced two electron transfer processes in a multi-component photocatalytic system, consisting of [Ru(bpy)3](2+)/ a diiron(iii,iii) model/triethylamine. EXAFS analysis with DFT calculations confirms the structural configurations of the diiron(iii,iii) and reduced diiron(ii,ii) states.
February 15, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28198038/likelihood-of-cesarean-delivery-after-applying-leading-active-labor-diagnostic-guidelines
#9
Jeremy L Neal, Nancy K Lowe, Julia C Phillippi, Sharon L Ryan, Amy M Knupp, Mary S Dietrich, Stephen F Thung
BACKGROUND: Friedman, the United Kingdom's National Institute for Health and Care Excellence (NICE), and the American College of Obstetricians and Gynecologists/Society for Maternal-Fetal Medicine (ACOG/SMFM) support different active labor diagnostic guidelines. Our aims were to compare likelihoods for cesarean delivery among women admitted before vs in active labor by diagnostic guideline (within-guideline comparisons) and between women admitted in active labor per one or more of the guidelines (between-guideline comparisons)...
February 15, 2017: Birth
https://www.readbyqxmd.com/read/28196501/taking-multi-morbidity-into-account-when-attributing-dalys-to-risk-factors-comparing-dynamic-modeling-with-the-gbd2010-calculation-method
#10
Hendriek C Boshuizen, Wilma J Nusselder, Marjanne H D Plasmans, Henk H Hilderink, Bianca E P Snijders, René Poos, Coen H van Gool
BACKGROUND: Disability Adjusted Life Years (DALYs) quantify the loss of healthy years of life due to dying prematurely and due to living with diseases and injuries. Current methods of attributing DALYs to underlying risk factors fall short on two main points. First, risk factor attribution methods often unjustly apply incidence-based population attributable fractions (PAFs) to prevalence-based data. Second, it mixes two conceptually distinct approaches targeting different goals, namely an attribution method aiming to attribute uniquely to a single cause, and an elimination method aiming to describe a counterfactual situation without exposure...
February 14, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28195954/test-retest-reliability-of-traumatic-brain-injury-outcome-measures-a-traumatic-brain-injury-model-systems-study
#11
Jennifer A Bogner, Gale G Whiteneck, Jessica MacDonald, Shannon B Juengst, Allen W Brown, Angela M Philippus, Jennifer H Marwitz, Jeannie Lengenfelder, Dave Mellick, Patricia Arenth, John D Corrigan
OBJECTIVE: Evaluate the test-retest reliability of measures that comprise the Traumatic Brain Injury Model Systems follow-up data set. PARTICIPANTS: A total of 224 persons with a moderate-severe traumatic brain injury (TBI) enrolled in the Traumatic Brain Injury Model Systems National Database. DESIGN: Following standard administration of the follow-up interview, a second interview was administered 14 to 28 days later using the same interviewer and the same mode of administration...
February 10, 2017: Journal of Head Trauma Rehabilitation
https://www.readbyqxmd.com/read/28195575/a-land-data-assimilation-system-for-sub-saharan-africa-food-and-water-security-applications
#12
Amy McNally, Kristi Arsenault, Sujay Kumar, Shraddhanand Shukla, Pete Peterson, Shugong Wang, Chris Funk, Christa D Peters-Lidard, James P Verdin
Seasonal agricultural drought monitoring systems, which rely on satellite remote sensing and land surface models (LSMs), are important for disaster risk reduction and famine early warning. These systems require the best available weather inputs, as well as a long-term historical record to contextualize current observations. This article introduces the Famine Early Warning Systems Network (FEWS NET) Land Data Assimilation System (FLDAS), a custom instance of the NASA Land Information System (LIS) framework. The FLDAS is routinely used to produce multi-model and multi-forcing estimates of hydro-climate states and fluxes over semi-arid, food insecure regions of Africa...
February 14, 2017: Scientific Data
https://www.readbyqxmd.com/read/28192286/superconducting-properties-of-the-s-%C3%A2-wave-state-fe-based-superconductors
#13
Yunkyu Bang, G R Stewart
Although the pairing mechanism of Fe-based superconductors (FeSCs) has not yet been settled with consensus with regard to the pairing symmetry and the superconducting (SC) gap function, the vast majority of experiments support the existence of spin-singlet sign-changing s-wave SC gaps on multi-bands ([Formula: see text]-wave state). This multi-band [Formula: see text]-wave state is a very unique gap state per se and displays numerous unexpected novel SC properties, such as a strong reduction of the coherence peak, non-trivial impurity effects, nodal-gap-like nuclear magnetic resonance signals, various Volovik effects in the specific heat (SH) and thermal conductivity, and anomalous scaling behaviors with a SH jump and condensation energy versus T c, etc...
February 13, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28191312/mapping-eq-5d-utilities-to-gbd-2010-and-gbd-2013-disability-weights-results-of-two-pilot-studies-in-belgium
#14
C Maertens de Noordhout, B Devleesschauwer, L Gielens, M H D Plasmans, J A Haagsma, N Speybroeck
BACKGROUND: Utilities and disability weights (DWs) are metrics used for calculating Quality-Adjusted Life Years and Disability-Adjusted Life Years (DALYs), respectively. Utilities can be obtained with multi-attribute instruments such as the EuroQol 5 dimensions questionnaire (EQ-5D). In 2010 and 2013, Salomon et al. proposed a set of DWs for 220 and 183 health states, respectively. The objective of this study is to develop an approach for mapping EQ-5D utilities to existing GBD 2010 and GBD 2013 DWs, allowing to predict new GBD 2010/2013 DWs based on EQ-5D utilities...
2017: Archives of Public Health, Archives Belges de Santé Publique
https://www.readbyqxmd.com/read/28190457/public-attitudes-toward-consent-and-data-sharing-in-biobank-research-a-large-multi-site-experimental-survey-in-the-us
#15
Saskia C Sanderson, Kyle B Brothers, Nathaniel D Mercaldo, Ellen Wright Clayton, Armand H Matheny Antommaria, Sharon A Aufox, Murray H Brilliant, Diego Campos, David S Carrell, John Connolly, Pat Conway, Stephanie M Fullerton, Nanibaa' A Garrison, Carol R Horowitz, Gail P Jarvik, David Kaufman, Terrie E Kitchner, Rongling Li, Evette J Ludman, Catherine A McCarty, Jennifer B McCormick, Valerie D McManus, Melanie F Myers, Aaron Scrol, Janet L Williams, Martha J Shrubsole, Jonathan S Schildcrout, Maureen E Smith, Ingrid A Holm
Individuals participating in biobanks and other large research projects are increasingly asked to provide broad consent for open-ended research use and widespread sharing of their biosamples and data. We assessed willingness to participate in a biobank using different consent and data sharing models, hypothesizing that willingness would be higher under more restrictive scenarios. Perceived benefits, concerns, and information needs were also assessed. In this experimental survey, individuals from 11 US healthcare systems in the Electronic Medical Records and Genomics (eMERGE) Network were randomly allocated to one of three hypothetical scenarios: tiered consent and controlled data sharing; broad consent and controlled data sharing; or broad consent and open data sharing...
February 4, 2017: American Journal of Human Genetics
https://www.readbyqxmd.com/read/28188897/unmasking-survival-biases-in-observational-treatment-studies-of-influenza-patients
#16
Martin Wolkewitz, Martin Schumacher
BACKGROUND: Several observational studies reported that Oseltamivir (Tamiflu) reduced mortality in infected and hospitalized patients. Due to the restriction of observation to hospital stay and time-dependent treatment assignment, such findings were prone to common types of survival bias (length, time-dependent and competing risk bias). METHODS: British hospital data from the FLU-CIN study group were used which included 1391 patients with confirmed pandemic influenza A/H1N1 2009 infection...
February 7, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28186894/re-weighted-discriminatively-embedded-k-means-for-multi-view-clustering
#17
Jinglin Xu, Junwei Han, Feiping Nie, Xuelong Li
Recent years, more and more multi-view data are widely used in many real world applications. This kind of data (such as image data) are high dimensional and obtained from different feature extractors, which represents distinct perspectives of the data. How to cluster such data efficiently is a challenge. In this paper, we propose a novel multi-view clustering framework, called Re-weighted Discriminatively Embedded KMeans (RDEKM), for this task. The proposed method is a multiview least-absolute residual model which induces robustness to efficiently mitigates the influence of outliers and realizes dimension reduction during multi-view clustering...
February 8, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28186212/computational-investigation-of-the-kinetics-and-mechanism-of-the-initial-steps-of-the-fischer-tropsch-synthesis-on-cobalt
#18
Pieter van Helden, Jan-Albert van den Berg, Melissa A Petersen, Werner Janse van Rensburg, Ionel M Ciobîcă, Jan van de Loosdrecht
A multi-site microkinetic model for the Fischer-Tropsch synthesis (FTS) reaction up to C2 products on a FCC cobalt catalyst surface is presented. This model utilizes a multi-faceted cobalt nanoparticle model for the catalyst, consisting of the two dominant cobalt surface facets Co(111) and Co(100), and a step site represented by the Co(211) surface. The kinetic parameters for the intermediates and transition states on these sites were obtained using plane-wave, periodic boundary condition density functional theory...
February 10, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28185622/application-of-multi-model-switching-predictive-functional-control-on-the-temperature-system-of-an-electric-heating-furnace
#19
Weide Xu, Junfeng Zhang, Ridong Zhang
A method of multi-model switching based predictive functional control is proposed and applied to the temperature control system of an electric heating furnace. The control strategies provide the effective and independent control modes of the electric heating furnace temperature in order to obtain improved control performance. The method depends on conventional implementation of the multi-model switching state, which requires some endeavors to tune the switching model in the model predictive control and allows a reduction of the calculation compared with the weighted multiple model algorithms...
February 6, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28185556/a-performance-study-of-the-impact-of-recombination-on-species-tree-analysis
#20
Zhiwei Wang, Kevin J Liu
BACKGROUND: The most widely used state-of-the-art methods for reconstructing species phylogenies from genomic sequence data assume that sampled loci are identically and independently distributed. In principle, free recombination between loci and a lack of intra-locus recombination are necessary to satisfy this assumption. Few studies have quantified the practical impact of recombination on species tree inference methods, and even fewer have used genomic sequence data for this purpose...
November 11, 2016: BMC Genomics
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