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https://www.readbyqxmd.com/read/28538155/structure-and-intermolecular-interactions-between-l-type-straight-flagellar-filaments
#1
Daniel Louzon, Avi Ginsburg, Walter Schwenger, Tom Dvir, Zvonimir Dogic, Uri Raviv
Bacterial mobility is powered by rotation of helical flagellar filaments driven by rotary motors. Flagellin isolated from the Salmonella Typhimurium SJW1660 strain, which differs by a point mutation from the wild-type strain, assembles into straight filaments in which flagellin monomers are arranged in a left-handed helix. Using small-angle x-ray scattering and osmotic stress methods, we investigated the structure of SJW1660 flagellar filaments as well as the intermolecular forces that govern their assembly into dense hexagonal bundles...
May 23, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28538153/new-continuum-approaches-for-determining-protein-induced-membrane-deformations
#2
David Argudo, Neville P Bethel, Frank V Marcoline, Charles W Wolgemuth, Michael Grabe
The influence of the membrane on transmembrane proteins is central to a number of biological phenomena, notably the gating of stretch activated ion channels. Conversely, membrane proteins can influence the bilayer, leading to the stabilization of particular membrane shapes, topological changes that occur during vesicle fission and fusion, and shape-dependent protein aggregation. Continuum elastic models of the membrane have been widely used to study protein-membrane interactions. These mathematical approaches produce physically interpretable membrane shapes, energy estimates for the cost of deformation, and a snapshot of the equilibrium configuration...
May 23, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28537747/examination-of-the-mechanism-of-the-yield-of-n2o-from-nitroxyl-hno-in-the-solution-phase-by-theoretical-calculations
#3
Kaiqiang Zhang, Stefan T Thynell
The dimerization of HNO and subsequent yield of N2O in aqueous solution are studied based on the theoretical calculations and kinetic simulations. The initial dimerization reactions were computed at various levels of theory and large divergence was observed in the predictions of the gas-phase free energies. The T1 diagnostics at CCSD(T)/aug-cc-pVTZ suggests multireference characteristics of the HNO dimers and the transition states. The solution-phase free energies were obtained using the wB97XD method and the SMD solvation model...
May 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28535554/anesthetic-considerations-and-perioperative-management-of-spinal-cord-stimulators-literature-review-and-initial-recommendations
#4
Michael E Harned, Brandon Gish, Allison Zuelzer, Jay S Grider
BACKGROUND: Patients with implanted spinal cord stimulators (SCS) present to the anesthesia care team for management at many different points along the care continuum. Currently, the literature is sparse on the perioperative management. What is available is confusing; monopolar electrocautery is contraindicated but often used, full body magnetic resonance imaging (MRI) is safe with particular systems but with other manufactures only head and specific extremities exams are safe. Moreover, there are anesthetizing locations outside of the operating room where implanted SCS can interact with surrounding medical equipment and pose significant risk to patient and device...
May 2017: Pain Physician
https://www.readbyqxmd.com/read/28533987/exoskeleton-may-influence-the-internal-body-temperatures-of-neotropical-dung-beetles-col-scarabaeinae
#5
Valentina Amore, Malva I M Hernández, Luis M Carrascal, Jorge M Lobo
The insect exoskeleton is a multifunctional coat with a continuum of mechanical and structural properties constituting the barrier between electromagnetic waves and the internal body parts. This paper examines the ability of beetle exoskeleton to regulate internal body temperature considering its thermal permeability or isolation to simulated solar irradiance and infrared radiation. Seven Neotropical species of dung beetles (Coleoptera, Scarabaeinae) differing in colour, surface sculptures, size, sexual dimorphism, period of activity, guild category and altitudinal distribution were studied...
2017: PeerJ
https://www.readbyqxmd.com/read/28533906/diagnosis-of-cirrhosis-and-portal-hypertension-imaging-non-invasive-markers-of-fibrosis-and-liver-biopsy
#6
REVIEW
Bogdan Procopet, Annalisa Berzigotti
The concept of 'cirrhosis' is evolving and it is now clear that compensated and decompensated cirrhosis are completely different in terms of prognosis. Furthermore, the term 'advanced chronic liver disease (ACLD)' better reflects the continuum of histological changes occurring in the liver, which continue to progress even after cirrhosis has developed, and might regress after removing the etiological factor causing the liver disease. In compensated ACLD, portal hypertension marks the progression to a stage with higher risk of clinical complication and requires an appropriate evaluation and treatment...
May 2017: Gastroenterology Report
https://www.readbyqxmd.com/read/28533825/in-situ-mems-testing-correlation-of-high-resolution-x-ray-diffraction-with-mechanical-experiments-and-finite-element-analysis
#7
REVIEW
Andreas Schifferle, Alex Dommann, Antonia Neels
New methods are needed in microsystems technology for evaluating microelectromechanical systems (MEMS) because of their reduced size. The assessment and characterization of mechanical and structural relations of MEMS are essential to assure the long-term functioning of devices, and have a significant impact on design and fabrication. Within this study a concept for the investigation of mechanically loaded MEMS materials on an atomic level is introduced, combining high-resolution X-ray diffraction (HRXRD) measurements with finite element analysis (FEA) and mechanical testing...
2017: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/28532466/baseline-and-stress-induced-levels-of-corticosterone-in-male-and-female-afrotropical-and-european-temperate-stonechats-during-breeding
#8
Beate Apfelbeck, Barbara Helm, Juan Carlos Illera, Kim G Mortega, Patrick Smiddy, Neil P Evans
BACKGROUND: Latitudinal variation in avian life histories falls along a slow-fast pace of life continuum: tropical species produce small clutches, but have a high survival probability, while in temperate species the opposite pattern is found. This study investigated whether differential investment into reproduction and survival of tropical and temperate species is paralleled by differences in the secretion of the vertebrate hormone corticosterone (CORT). Depending on circulating concentrations, CORT can both act as a metabolic (low to medium levels) and a stress hormone (high levels) and, thereby, influence reproductive decisions...
May 22, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28532426/measuring-health-workers-motivation-composition-validation-of-a-scale-based-on-self-determination-theory-in-burkina-faso
#9
Julia Lohmann, Aurélia Souares, Justin Tiendrebéogo, Nathalie Houlfort, Paul Jacob Robyn, Serge M A Somda, Manuela De Allegri
BACKGROUND: Although motivation of health workers in low- and middle-income countries (LMICs) has become a topic of increasing interest by policy makers and researchers in recent years, many aspects are not well understood to date. This is partly due to a lack of appropriate measurement instruments. This article presents evidence on the construct validity of a psychometric scale developed to measure motivation composition, i.e., the extent to which motivation of different origin within and outside of a person contributes to their overall work motivation...
May 22, 2017: Human Resources for Health
https://www.readbyqxmd.com/read/28531268/implementation-of-an-integrated-approach-to-the-national-hiv-aids-strategy-for-improving-human-immunodeficiency-virus-care-for-youths
#10
J Dennis Fortenberry, Linda J Koenig, Bill G Kapogiannis, Carrie L Jeffries, Jonathan M Ellen, Craig M Wilson
Importance: Youths aged 13 to 24 years old living with human immunodeficiency virus (HIV) are less likely than adults to receive the health and prevention benefits of HIV treatments, with only a small proportion having achieved sustained viral suppression. These age-related disparities in HIV continuum of care are owing in part to the unique developmental issues of adolescents and young adults as well as the complexity and fragmentation of HIV care and related services. This article summarizes a national, multiagency, and multilevel approach to HIV care for newly diagnosed youths designed to bridge some of these fragmentations by addressing National HIV/AIDS Strategy goals for people living with HIV...
May 22, 2017: JAMA Pediatrics
https://www.readbyqxmd.com/read/28530730/evaluation-of-electronic-polarization-energy-in-oligoacene-molecular-crystals-using-the-solvated-supermolecular-approach
#11
Tao Xu, Wenliang Wang, Shiwei Yin, Yun Wang
The solvated supermolecular approach, i.e., block-localized wave function coupled with polarizable continuum model (BLW/PCM), was proposed to calculate molecular ionization potential (IP), electron affinity (EA) in the solid phase, and related electronic polarization. Via the calculations of a solvated supermolecule (5M), including four closest molecules, BLW/PCM overcomes the limitation in the calculation for the monomer PCM, that is, nearly same electronic polarization for cation (P+) and anion (P-). The solvated supermolecular approach successfully described asymmetric behaviors of P+ and P- for oligoacene crystals...
May 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28530632/anisotropic-transport-of-normal-metal-barrier-normal-metal-junctions-in-monolayer-phosphorene
#12
Sangita de Sarkar, Amit Agarwal, Krishnendu Sengupta
We study transport properties of a phosphorene monolayer in the presence of single and multiple potential barriers of height $U_0$ and width $d$, using both continuum and microscopic lattice models, and show that the nature of electron transport along its armchair edge ($x$ direction) is qualitatively different from its counterpart in both conventional two-dimensional electron gas with Schr\"odinger-like quasiparticles and graphene or surfaces of topological insulators hosting massless Dirac quasiparticles...
May 22, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28530047/what-is-it-going-to-take-to-move-youth-related-hiv-programme-policies-into-practice-in-africa
#13
Daniella Mark, Lina Taing, Lucie Cluver, Chris Collins, Kate Iorpenda, Catarina Andrade, Luann Hatane
INTRODUCTION: HIV has been reported to be the leading cause of mortality amongst adolescents in Africa. This has brought attention to the changes in service provision and health management that many adolescents living with HIV experience when transferring from specialized paediatric- or adolescent-focused services to adult care. When transition is enacted poorly, adherence may be affected and the continuum of care disrupted. As the population of HIV-infected adolescents grows, effective and supported transition increases in significance as an operational imperative...
May 16, 2017: Journal of the International AIDS Society
https://www.readbyqxmd.com/read/28528644/bypassing-negative-epistasis-on-yield-in-tomato-imposed-by-a-domestication-gene
#14
Sebastian Soyk, Zachary H Lemmon, Matan Oved, Josef Fisher, Katie L Liberatore, Soon Ju Park, Anna Goren, Ke Jiang, Alexis Ramos, Esther van der Knaap, Joyce Van Eck, Dani Zamir, Yuval Eshed, Zachary B Lippman
Selection for inflorescence architecture with improved flower production and yield is common to many domesticated crops. However, tomato inflorescences resemble wild ancestors, and breeders avoided excessive branching because of low fertility. We found branched variants carry mutations in two related transcription factors that were selected independently. One founder mutation enlarged the leaf-like organs on fruits and was selected as fruit size increased during domestication. The other mutation eliminated the flower abscission zone, providing "jointless" fruit stems that reduced fruit dropping and facilitated mechanical harvesting...
May 15, 2017: Cell
https://www.readbyqxmd.com/read/28527474/fifteen-years-of-experience-from-a-medical-school-clinical-skills-laboratory
#15
José Miguel Pêgo, João José Cerqueira, João Bessa, Vitor Hugo Pereira, Sara Gomes, José Mariz, Rita Sousa, Pedro Morgado, Nuno Sousa
INTRODUCTION: Medical Education has evolved being defined as a continuum of the medical training from the pre- to the post-graduate period and through a lifetime of medical practice that is mirrored in the competencies framework that several international institutions have established. This creates a challenge to educational institutions (pre- and post-graduate) that traditionally take separate pathways. MATERIAL AND METHODS: The present report is a description of the efforts carried by the School of Medicine of the University of Minho to implement a strategy of teaching/learning methods that follows modern standards towards constructive alignment of the medical curriculum, from the pre- to the post-graduate...
February 27, 2017: Acta Médica Portuguesa
https://www.readbyqxmd.com/read/28527471/the-electron-shuffle-cerium-influences-samarium-4f-orbital-occupancy-in-heteronuclear-ce-sm-oxide-clusters
#16
Jared O Kafader, Josey E Topolski, Vicmarie Marrero-Colon, Srinivasan S Iyengar, Caroline Chick Jarrold
The anion photoelectron (PE) spectra along with supporting results of density functional theory (DFT) calculations on SmO(-), SmCeOy(-), and Sm2Oy(-) (y = 1, 2) are reported and compared to previous results on CeO(-) [M. Ray et al., J. Chem. Phys. 142, 064305 (2015)] and Ce2Oy(-) (y = 1, 2) [J. O. Kafader et al., J. Chem. Phys. 145, 154306 (2016)]. Similar to the results on CexOy(-) clusters, the PE spectra of SmO(-), SmCeOy(-), and Sm2Oy(-) (y = 1, 2) all exhibit electronic transitions to the neutral ground state at approximately 1 eV e(-)BE...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28526661/the-parasol-protocol-an-implementation-science-study-of-hiv-continuum-of-care-interventions-for-gay-men-and-transgender-women-in-burma-myanmar
#17
Andrea L Wirtz, Soe Naing, Emily Clouse, Kaung Htet Thu, Sandra Hsu Hnin Mon, Zin Min Tun, Stefan Baral, Aung Zayar Paing, Chris Beyrer
BACKGROUND: Efforts to improve HIV diagnosis and antiretroviral therapy (ART) initiation among people living with HIV and reduce onward transmission of HIV rely on innovative interventions along multiple steps of the HIV care continuum. These innovative methods are particularly important for key populations, including men who have sex with men (MSM) and transgender women (TW). The HIV epidemic in Myanmar is concentrated among key populations, and national efforts now focus on reducing stigma and improving engagement of MSM and TW in HIV prevention and care...
May 17, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/28526402/outpatient-antibiotic-stewardship-interventions-and-opportunities
#18
Erica L Dobson, Michael E Klepser, Jason M Pogue, Matthew J Labreche, Alex J Adams, Timothy P Gauthier, R Brigg Turner, Christy P Su, David M Jacobs, Katie J Suda
Improving the use of antibiotics across the continuum of care is a national priority. Data outlining the misuse of antibiotics in the outpatient setting justify the expansion of antibiotic stewardship programs (ASPs) into this health care setting; however, best practices for outpatient antibiotic stewardship (AS) are not yet defined. In a companion article, we focused on recommendations to overcome challenges related to the implementation of an outpatient ASP (e.g., building the AS team and defining program metrics)...
May 16, 2017: Journal of the American Pharmacists Association: JAPhA
https://www.readbyqxmd.com/read/28525805/typical-integration-of-emotion-cues-from-bodies-and-faces-in-autism-spectrum-disorder
#19
Rebecca Brewer, Federica Biotti, Geoffrey Bird, Richard Cook
Contextual cues derived from body postures bias how typical observers categorize facial emotion; the same facial expression may be perceived as anger or disgust when aligned with angry and disgusted body postures. Individuals with Autism Spectrum Disorder (ASD) are thought to have difficulties integrating information from disparate visual regions to form unitary percepts, and may be less susceptible to visual illusions induced by context. The current study investigated whether individuals with ASD exhibit diminished integration of emotion cues extracted from faces and bodies...
May 16, 2017: Cognition
https://www.readbyqxmd.com/read/28525464/the-cardiac-rehabilitation-model-improves-fitness-quality-of-life-and-depression-in-breast-cancer-survivors
#20
Lianne B Dolan, Danielle Barry, Teresa Petrella, Lindsay Davey, Ann Minnes, Allison Yantzi, Susan Marzolini, Paul Oh
PURPOSE: Exercise is a demonstrated, therapeutic strategy for cancer survivors to minimize many treatment-induced side effects and may decrease risk of recurrence. Nonetheless, structured programs that combine exercise and education are not yet standardized within cancer care. The Health, Exercise, Active Living, Therapeutic lifestyle (HEALTh) program is a clinical exercise program based on the established cardiac rehabilitation model, but customized for female breast cancer survivors...
May 18, 2017: Journal of Cardiopulmonary Rehabilitation and Prevention
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