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https://www.readbyqxmd.com/read/27910831/high-z-structures-of-organic-molecules-their-diversity-and-organizing-principles
#1
Carolyn Pratt Brock
A list has been compiled of 284 well determined organic structures having more than four crystallographically independent molecules or formula units (i.e. Z' > 4). Another 22 structures were rejected because the space group or unit cell was probably misassigned; the rate for that type of error is then only 7%. The space-group frequencies are unusual; half the structures are in Sohncke groups, partly because the fraction of enantiopure structures of resolvable enantiomers is higher than for lower Z' structures...
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27909053/endoplasmic-reticulum-stress-and-ca2-depletion-differentially-modulate-the-sterol-regulatory-protein-pcsk9-to-control-lipid-metabolism
#2
Paul Lebeau, Ali Al-Hashimi, Sudesh Sood, Sarka Lhotak, Pei Yu, Gabriel Gyulay, Guillaume Pare, S R Wayne Chen, Bernardo Trigatti, Annik Prat, Nabil Seidah, Richard C Austin
Accumulating evidence implicates endoplasmic reticulum (ER) stress as a mediator of impaired lipid metabolism, thereby contributing to fatty liver disease and atherosclerosis. Previous studies demonstrated that ER stress can activate the sterol regulatory element-binding protein-2 (SREBP2), an ER localized transcription factor that directly upregulates sterol-regulatory genes, including PCSK9. Given that PCSK9 contributes to atherosclerosis by targeting low-density lipoprotein (LDL) receptor (LDLR) degradation, our present study investigates a novel mechanism by which ER stress plays a role in lipid metabolism by examining its ability to modulate PCSK9 expression...
December 1, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27906472/long-term-clinical-impact-and-cost-effectiveness-of-obeticholic-acid-for-the-treatment-of-primary-biliary-cholangitis
#3
Sumeyye Samur, Matthew Klebanoff, Reiner Banken, Daniel S Pratt, Rick Chapman, Daniel A Ollendorf, Anne M Loos, Kathleen Corey, Chin Hur, Jagpreet Chhatwal
: Primary biliary cholangitis (PBC) is a chronic, progressive autoimmune liver disease that mainly affects middle-aged women. Obeticholic acid (OCA), which was recently approved by the Food and Drug Administration for PBC treatment, has demonstrated positive effects on biochemical markers of liver function. Our objective was to evaluate the long-term clinical impact and cost-effectiveness of OCA as a second-line treatment for PBC in combination with ursodeoxycholic acid (UDCA) in adults with an inadequate response to UDCA...
November 7, 2016: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/27896709/learned-value-and-object-perception-accelerated-perception-or-biased-decisions
#4
Jason Rajsic, Harendri Perera, Jay Pratt
Learned value is known to bias visual search toward valued stimuli. However, some uncertainty exists regarding the stage of visual processing that is modulated by learned value. Here, we directly tested the effect of learned value on preattentive processing using temporal order judgments. Across four experiments, we imbued some stimuli with high value and some with low value, using a nonmonetary reward task. In Experiment 1, we replicated the value-driven distraction effect, validating our nonmonetary reward task...
November 28, 2016: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/27881701/externally-visible-thrombus-partially-predicts-internal-thrombus-deposition-in-extracorporeal-membrane-oxygenators
#5
Charles F Evans, Tieluo Li, Vikas Mishra, Diana L Pratt, Isa S K Mohammed, Zachary N Kon, Bartley P Griffith
AIM: We sought to quantify the location and volume of thrombus in used hollow-fiber membrane oxygenators and correlate the volume of thrombus with patient demographics, flow characteristics and anticoagulation parameters. METHODS: Hollow-fiber membrane oxygenators (Quadrox D, Maquet, Rastatt, Germany) were collected after clinical use in ECMO circuits and divided into sections. Each section was digitally imaged and analyzed using ImageJ software. The location and total volume (cm(3)) of thrombus was calculated for different sections...
November 22, 2016: Perfusion
https://www.readbyqxmd.com/read/27879199/an-nmda-receptor-dependent-mechanism-for-subcellular-segregation-of-sensory-inputs-in-the-tadpole-optic-tectum
#6
Ali S Hamodi, Zhenyu Liu, Kara G Pratt
In the vertebrate CNS, afferent sensory inputs are targeted to specific depths or layers of their target neuropil. This patterning exists ab initio, from the very beginning, and therefore has been considered an activity-independent process. However, here we report that, during circuit development, the subcellular segregation of the visual and mechanosensory inputs to specific regions of tectal neuron dendrites in the tadpole optic tectum requires NMDA receptor activity. Blocking NMDARs during the formation of these sensory circuits, or removing the visual set of inputs, leads to less defined segregation, and suggests a correlation-based mechanism in which correlated inputs wire to common regions of dendrites...
November 23, 2016: ELife
https://www.readbyqxmd.com/read/27878976/designing-research-funding-schemes-to-promote-global-health-equity-an-exploration-of-current-practice-in-health-systems-research
#7
Bridget Pratt, Adnan A Hyder
International research is an essential means of reducing health disparities between and within countries and should do so as a matter of global justice. Research funders from high-income countries have an obligation of justice to support health research in low and middle-income countries (LMICs) that furthers such objectives. This paper investigates how their current funding schemes are designed to incentivise health systems research in LMICs that promotes health equity. Semi-structured in-depth interviews were performed with 16 grants officers working for 11 funders and organisations that support health systems research: the Alliance for Health Policy and Systems Research, Comic Relief, Doris Duke Foundation, European Commission, International Development Research Centre, Norwegian Agency for Development Cooperation, Research Council of Norway, Rockefeller Foundation, UK Department of International Development, UK Medical Research Council, and Wellcome Trust...
November 23, 2016: Developing World Bioethics
https://www.readbyqxmd.com/read/27873424/the-cross-canada-quintet-presents-variations-on-music-movements-in-the-keys-of-h-p-and-e
#8
Brett Schrewe, Joanna Bates, Christopher Watling, Rachel H Ellaway, Dan Pratt
Whether it is rock playing in the background during a surgery, cool jazz that wafts from our office computer speakers as we write up our clinical notes, or the soaring of a symphony on the radio that inspires that perfect flourish to an article, music is woven throughout much of our clinical and academic lives. For the five of us, however, music alternates between the background and foreground in our lives as health professions educators. Music balances the working day, illuminates our research, and reconciles the utility of our training with the originality of our practice...
December 2016: Medical Education
https://www.readbyqxmd.com/read/27871471/endocan-expression-is-increased-in-the-placenta-from-obese-women-with-gestational-diabetes-mellitus
#9
Padma Murthi, Ramona Sarkis, Ratana Lim, Caitlyn Nguyen-Ngo, Anita Pratt, Stella Liong, Martha Lappas
INTRODUCTION: Endocan, a member of the proteoglycan family, is involved in a wide range of diseases including obesity and diabetes. The aim of this study was to determine the effect of (i) maternal obesity and gestational diabetes mellitus (GDM) on placental endocan expression; and (ii) endocan knockdown on markers of inflammation. METHODS: Endocan mRNA and protein expression was determined in human placenta from (i) lean and obese and normal glucose tolerant (NGT) pregnant women (n = 10 patients per group); and (ii) women with GDM and BMI-matched NGT women (n = 40 patients per group)...
December 2016: Placenta
https://www.readbyqxmd.com/read/27861981/conflicting-demands-on-angiosperm-xylem-tradeoffs-among-storage-transport-and-biomechanics
#10
REVIEW
R Brandon Pratt, Anna L Jacobsen
The secondary xylem of woody plants transports water, mechanically supports the plant body, and stores resources. These three functions are interdependent giving rise to tradeoffs in function. Understanding the relationships among these functions and their structural basis forms the context in which to interpret xylem evolution. The tradeoff between xylem transport efficiency and safety from cavitation has been carefully examined with less focus on other functions, particularly storage. Here, we synthesize data on all three xylem functions in angiosperm branch xylem in the context of tradeoffs...
November 8, 2016: Plant, Cell & Environment
https://www.readbyqxmd.com/read/27857714/t-cells-exacerbate-lyme-borreliosis-in-tlr2-deficient-mice
#11
Carrie E Lasky, Carmela L Pratt, Kinsey A Hilliard, John L Jones, Charles R Brown
Infection of humans with the spirochete, Borrelia burgdorferi, causes Lyme borreliosis and can lead to clinical manifestations such as arthritis, carditis, and neurological conditions. Experimental infection of mice recapitulates many of these symptoms and serves as a model system for the investigation of disease pathogenesis and immunity. Innate immunity is known to drive the development of Lyme arthritis and carditis, but the mechanisms driving this response remain unclear. Innate immune cells recognize B...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27855318/a-method-for-measuring-the-three-dimensional-orientation-of-cortical-canals-with-implications-for-comparative-analysis-of-bone-microstructure-in-vertebrates
#12
Isaac Vorster Pratt, David Michael Lane Cooper
The orientation of vascular canals in cortical bone can reveal information about the growth rate and loading environment of a bone. For example, in birds it has been proposed that a high proportion of circumferential canals (a laminar cortex) is related to fast growth or torsional loading related to active flight. In this paper we present a method to measure the three dimensional (3D) orientation of vascular canals. Image data are obtained from micro-CT and two angles are measured: phi, determining how longitudinal a canal is; and theta, determining whether a canal is radial or circumferential...
November 2, 2016: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/27854455/much-ado-about-nothing-capturing-attention-toward-locations-without-new-perceptual-events
#13
Matthew D Hilchey, J Eric T Taylor, Jay Pratt
Popular frameworks of attention propose that visual orienting occurs through a combination of bottom-up (stimulus-driven) and top-down (goal-directed) processes. Much of the basic research on these processes adheres paradigmatically to experimental methods that introduce salient but task-irrelevant stimuli (objects or transients) to the visual environment to determine whether attention is captured to their locations. This common practice of changing or adding a stimulus to a location to determine whether it captures attention reflects a notion that locations at which new features or stimuli spontaneously appear are prioritized above all else...
December 2016: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/27853273/growing-nurse-leaders-their-perspectives-on-nursing-leadership-and-today%C3%A2-s-practice-environment
#14
Susan M Dyess, Rose O Sherman, Beth A Pratt, Lenny Chiang-Hanisko
With the growing complexity of healthcare practice environments and pending nurse leader retirements, the development of future nurse leaders is increasingly important. This article reports on focus group research conducted with Generation Y nurses prior to their initiating coursework in a Master’s Degree program designed to support development of future nurse leaders. Forty-four emerging nurse leaders across three program cohorts participated in this qualitative study conducted to capture perspectives about nursing leaders and leadership...
January 14, 2016: Online Journal of Issues in Nursing
https://www.readbyqxmd.com/read/27847217/assessing-the-effect-of-physical-activity-classes-in-public-spaces-on-leisure-time-physical-activity-al-ritmo-de-las-comunidades-a-natural-experiment-in-bogota-colombia
#15
Andrea Torres, María Paula Díaz, Matthew J Hayat, Rodney Lyn, Michael Pratt, Deborah Salvo, Olga L Sarmiento
The Recreovia program provides free physical activity (PA) classes in public spaces in Bogota, Colombia. The purpose of this study was to assess the effectiveness of the Recreovia program in increasing PA among users of nine parks in Bogota. This study was a natural experiment conducted between 2013 and 2015 in Bogota. Community members and park users living nearby three groups of parks were compared: Group 1 were parks implementing new Recreovias (n=3), Group 2 were control parks (n=3) without Recreovias, and Group 3 were parks with existing Recreovías...
November 12, 2016: Preventive Medicine
https://www.readbyqxmd.com/read/27836577/chronic-use-of-opioids-before-and-after-total-knee-arthroplasty-a-retrospective-cohort-study
#16
Craig A Hansen, Maria C S Inacio, Nicole L Pratt, Elizabeth E Roughead, Stephen E Graves
BACKGROUND: Opioids are commonly used for the management of preoperative and postoperative pain among patients undergoing total knee arthroplasty (TKA). There is limited literature on the chronic use of opioids pre-TKA and post-TKA. The aim of this study was to characterize the use of opioids in TKA patients before and after surgery and identify risk factors of chronic opioid use. METHODS: Opioid use among 15,020 patients undergoing TKA (01/01/2001-31/12/2012) was examined...
October 4, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27834668/chemical-enhancement-of-in-vitro-and-in-vivo-direct-cardiac-reprogramming
#17
Tamer M A Mohamed, Nicole R Stone, Emily C Berry, Ethan Radzinsky, Yu Huang, Karishma Pratt, Yen-Sin Ang, Pengzhi Yu, Haixia Wang, Shibing Tang, Sergey Magnitsky, Sheng Ding, Kathryn N Ivey, Deepak Srivastava
BACKGROUND: -Reprogramming of cardiac fibroblasts into induced cardiomyocyte-like cells (iCMs) in situ represents a promising strategy for cardiac regeneration. A combination of three cardiac transcription factors, Gata4, Mef2c and Tbx5 (GMT), can convert fibroblasts into iCMs, albeit with low efficiency in vitro METHODS: -We screened 5,500 compounds in primary cardiac fibroblasts to identify the pathways that can be modulated to enhance cardiomyocyte reprogramming. RESULTS: -We found that a combination of the transforming growth factor (TGF)-β inhibitor SB431542 and the WNT inhibitor XAV939 increased reprogramming efficiency eight-fold when added to GMT-overexpressing cardiac fibroblasts...
November 10, 2016: Circulation
https://www.readbyqxmd.com/read/27832716/a-framework-for-negotiating-positionality-in-phenomenological-research
#18
Robin M Hopkins, Glenn Regehr, Daniel D Pratt
This Guide was written as an aid to those who are considering phenomenology as a methodology in their education research. Phenomenology allows us to understand and appreciate educational issues by exploring the unique experiences and perspectives of individuals involved in the process. There are certain core tenets to all phenomenological research, such as a focus on exploring experience and adopting a phenomenological stance. However, because phenomenology has emerged from the work of a number of related but distinct philosophers, phenomenologists do not adhere to a single approach...
November 10, 2016: Medical Teacher
https://www.readbyqxmd.com/read/27818623/an-evolutionarily-conserved-mechanism-for-activity-dependent-visual-circuit-development
#19
REVIEW
Kara G Pratt, Masaki Hiramoto, Hollis T Cline
Neural circuit development is an activity-dependent process. This activity can be spontaneous, such as the retinal waves that course across the mammalian embryonic retina, or it can be sensory-driven, such as the activation of retinal ganglion cells (RGCs) by visual stimuli. Whichever the source, neural activity provides essential instruction to the developing circuit. Indeed, experimentally altering activity has been shown to impact circuit development and function in many different ways and in many different model systems...
2016: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/27816492/tremelimumab-in-combination-with-ablation-in-patients-with-advanced-hepatocellular-carcinoma
#20
Austin G Duffy, Susanna V Ulahannan, Oxana Makorova-Rusher, Osama Rahma, Heiner Wedemeyer, Drew Pratt, Jeremy L Davis, Marybeth S Hughes, Theo Heller, Mei ElGindi, Ashish Uppala, Firouzeh Korangy, David E Kleiner, William D Figg, David Venzon, Seth M Steinberg, Aradhana M Venkatesan, Venkatesh Krishnasamy, Nadine Abi-Jaoudeh, Elliot Levy, Brad J Wood, Tim F Greten
BACKGROUND: Tremelimumab is a fully human monoclonal antibody that binds to CTLA-4 on the surface of activated T lymphocytes. Ablative therapies have been shown to induce a peripheral immune response which may enhance the effect of anti-CTLA4 treatment in patients with advanced HCC. METHODS: Patients with HCC [Childs Pugh A/B7; Barcelona Clinic Liver Cancer Stage B/C; ECOG 0/1] were enrolled in a study of tremelimumab in combination with an ablative procedure performed during week 6...
November 2, 2016: Journal of Hepatology
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