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https://www.readbyqxmd.com/read/28931087/microbial-analysis-of-zetaproteobacteria-and-co-colonizers-of-iron-mats-in-the-troll-wall-vent-field-arctic-mid-ocean-ridge
#1
Jan Vander Roost, Ingunn Hindenes Thorseth, Håkon Dahle
Over the last decade it has become increasingly clear that Zetaproteobacteria are widespread in hydrothermal systems and that they contribute to the biogeochemical cycling of iron in these environments. However, how chemical factors control the distribution of Zetaproteobacteria and their co-occurring taxa remains elusive. Here we analysed iron mats from the Troll Wall Vent Field (TWVF) located at the Arctic Mid-Ocean Ridge (AMOR) in the Norwegian-Greenland Sea. The samples were taken at increasing distances from high-temperature venting chimneys towards areas with ultraslow low-temperature venting, encompassing a large variety in geochemical settings...
2017: PloS One
https://www.readbyqxmd.com/read/28856478/sleep-duration-mortality-and-the-influence-of-age
#2
Torbjörn Åkerstedt, Francesca Ghilotti, Alessandra Grotta, Andrea Bellavia, Ylva Trolle Lagerros, Rino Bellocco
Prior work has shown that both short and long sleep predict mortality. However, sleep duration decreases with age and this may affect the relationship of sleep duration with mortality. The purpose of the present study was to assess whether the association between sleep duration and mortality varies with age. Prospective cohort study. 43,863 individuals (64% women), recruited in September 1997 during the Swedish National March and followed through record-linkages for 13 years. Sleep duration was self-reported and measured using the Karolinska Sleep Questionnaire, and grouped into 4 categories: ≤5, 6, 7 (reference) and ≥8 h...
August 30, 2017: European Journal of Epidemiology
https://www.readbyqxmd.com/read/28813402/the-blogger-and-the-trolls
#3
Emily Temple-Wood
No abstract text is available yet for this article.
August 15, 2017: Scientific American
https://www.readbyqxmd.com/read/28809530/steering-surface-reaction-at-specific-sites-with-self-assembly-strategy
#4
Xiong Zhou, Fabian Bebensee, Mingmei Yang, Regine Bebensee, Fang Cheng, Yang He, Qian Shen, Jian Shang, Zhirong Liu, Flemming Besenbacher, Trolle R Linderoth, Kai Wu
To discern the catalytic activity of different active sites, a self-assembly strategy is applied to confine the involved species that are "attached" to specific surface sites. The employed probe reaction system is the Ullmann coupling of 4-bromobiphenyl, C6H5C6H4Br, on an atomically flat Ag(111) surface, which is explored by combined scanning tunneling microscopy, synchrotron X-ray photoelectron spectroscopy, and density functional theory calculations. The catalytic cycle involves the detachment of the Br atom from the initial reactant to form an organometallic intermediate, C6H5C6H4AgC6H4C6H5, which subsequently self-assembles with its central Ag atom residing either on 2-fold bridge or 3-fold hollow sites at full coverage...
August 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28767515/35-year-trends-in-first-time-hospitalization-for-hip-fracture-one-year-mortality-and-the-prognostic-impact-of-comorbidity-a-danish-nationwide-cohort-study-1980-2014
#5
Alma B Pedersen, Vera Ehrenstein, Szimonetta Szépligeti, Astrid Lunde, Ylva Trolle Lagerros, Anna Westerlund, Grethe S Tell, Henrik T Sørensen
BACKGROUND: We examined trends in hip fracture incidence in Denmark from 1980 to 2014, trends in subsequent one-year mortality, and the prognostic impact of sex, age, and comorbidity. METHODS: This nationwide cohort study prospectively collected data from population-based Danish registries. We included 262,437 patients with incident hip fracture and assessed comorbidity using the Charlson Comorbidity Index (CCI). RESULTS: Despite slight increases in incidence rates (IRs) of hip fracture up to the mid-1990s, the annual IR decreased by 29% from 1980 to 2014 in women, but remained stable in men...
July 31, 2017: Epidemiology
https://www.readbyqxmd.com/read/28762721/supramolecular-corrals-on-surfaces-resulting-from-aromatic-interactions-of-nonplanar-triazoles
#6
Siddharth J Jethwa, Esben L Kolsbjerg, Sundar R Vadapoo, Jacob L Cramer, Lutz Lammich, Kurt V Gothelf, Bjørk Hammer, Trolle R Linderoth
Interaction forces between aromatic moieties, often referred to as π-π interactions, are an important element in stabilizing complex supramolecular structures. For supramolecular self-assembly occurring on surfaces, where aromatic moieties are typically forced to adsorb coplanar with the surface, the possible role of intermolecular aromatic interactions is much less explored. Here, we report on unusual, ring-shaped supramolecular corral surface structures resulting from adsorption of a molecule with nonplanar structure, allowing for intermolecular aromatic interactions...
August 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28667869/dynamic-modeling-of-trolling-mode-afm-considering-effects-of-cantilever-torsion-nanoneedle-flexibility-and-liquid-nanoneedle-interactions
#7
Mohammadreza Sajjadi, Hossein Nejat Pishkenari, Gholamreza Vossoughi
Trolling mode atomic force microscope (TR-Mode AFM) significantly reduces the hydrodynamic drag generated during operation in liquid environments. This is achieved by utilizing a long nanoneedle and keeping the cantilever out of liquid. In this research, a continuous mathematical model is developed to study TR-Mode AFM dynamics near a sample submerged in the liquid. Effects of cantilever torsion, nanoneedle flexibility, and liquid-nanoneedle interactions are considered in the model. In order to derive the equations of motion, Hamilton's principle and assumed mode method are used...
June 20, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28662982/extended-oil-spill-spreading-with-langmuir-circulation
#8
Debra Simecek-Beatty, William J Lehr
When spilled in the ocean, most crude oils quickly spread into a thin film that ruptures into smaller slicks distributed over a larger area. Observers have also reported the film tearing apart into streaks that eventually merge forming fewer but longer bands of floating oil. Understanding this process is important to model oil spill transport. First, slick area is calculated using a spreading model. Next, Langmuir circulation models are used to approximate the merging of oiled bands. Calculations are performed on Troll blended and Alaska North Slope crude oils and results compared with measurements from the 1990s North Sea field experiments...
June 26, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28654859/a-comparison-of-methods-to-analyze-aquatic-heterotrophic-flagellates-of-different-taxonomic-groups
#9
Alexandra Jeuck, Frank Nitsche, Claudia Wylezich, Olaf Wirth, Tanja Bergfeld, Fabienne Brutscher, Melanie Hennemann, Shahla Monir, Anja Scherwaß, Nicole Troll, Hartmut Arndt
Heterotrophic flagellates contribute significantly to the matter flux in aquatic and terrestrial ecosystems. Still today their quantification and taxonomic classification bear several problems in field studies, though these methodological problems seem to be increasingly ignored in current ecological studies. Here we describe and test different methods, the live-counting technique, different fixation techniques, cultivation methods like the liquid aliquot method (LAM), and a molecular single cell survey called aliquot PCR (aPCR)...
May 9, 2017: Protist
https://www.readbyqxmd.com/read/28621171/boundary-cap-neural-crest-stem-cell-transplants-contribute-mts1-s100a4-expressing-cells-in-the-glial-scar
#10
Carl Trolle, Patrik Ivert, Jan Hoeber, Iris Rocamonde-Lago, Svitlana Vasylovska, Eugen Lukanidin, Elena N Kozlova
AIM: During development, boundary cap neural crest stem cells (bNCSCs) assist sensory axon growth into the spinal cord. Here we repositioned them to test if they assist regeneration of sensory axons in adult mice after dorsal root avulsion injury. MATERIALS & METHODS: Avulsed mice received bNCSC or human neural progenitor (hNP) cell transplants and their contributions to glial scar formation and sensory axon regeneration were analyzed with immunohistochemistry and transganglionic tracing...
June 16, 2017: Regenerative Medicine
https://www.readbyqxmd.com/read/28609621/orchestrating-directional-molecular-motions-kinetically-controlled-supramolecular-pathways-of-a-helical-host-on-rodlike-guests
#11
Xiang Wang, Barbara Wicher, Yann Ferrand, Ivan Huc
An aromatic oligoamide sequence was designed to fold and self-assemble into a double helical host having a cylindrical cavity complementary to linear oligocarbamate guests. Formation of helical pseudorotaxane complexes, foldaxanes, between the host and guests having binding stations of different affinities was evidenced by NMR and X-ray crystallography. Rodlike guests possessing two or three binding stations, long alkyl or oligoethylene glycol spacers or bulky barriers in-between the binding stations, and a single bulky stopper at one end were synthesized...
June 28, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28607762/can-visual-assessment-of-blood-flow-patterns-by-dynamic-contrast-enhanced-computed-tomography-distinguish-between-malignant-and-benign-lung-tumors
#12
Stefan Walbom Harders, Hans Henrik Madsen, Hanne Marie Nellemann, Torben Riis Rasmussen, Jesper Thygesen, Henrik Hager, Niels Trolle Andersen, Finn Rasmussen
BACKGROUND: Dynamic contrast-enhanced computed tomography (DCE-CT) is a tool, which, in theory, can quantify the blood flow and blood volume of tissues. In structured qualitative analysis, parametric color maps yield a visual impression of the blood flow and blood volume within the tissue being studied, allowing for quick identification of the areas with the highest or lowest blood flow and blood volume. PURPOSE: To examine whether DCE-CT could be used to distinguish between malignant and benign lung tumors in patients with suspected lung cancer...
May 2017: Acta Radiologica Open
https://www.readbyqxmd.com/read/28595290/dietary-fat-intake-and-fecundability-in-two-preconception-cohort-studies
#13
Lauren A Wise, Amelia K Wesselink, Katherine L Tucker, Shilpa Saklani, Ellen M Mikkelsen, Heidi Cueto, Anders H Riis, Ellen Trolle, Craig J McKinnon, Kristen A Hahn, Kenneth J Rothman, Henrik Toft Sørensen, Elizabeth E Hatch
The association between dietary fat and fertility is not well-studied. We evaluated intakes of total fat, saturated fatty acids, monounsaturated fatty acids, polyunsaturated fatty acids, trans fatty acids (TFA), and omega-3 and-6 fatty acids in relation to fecundability in Danish and North American preconception cohort studies. Female pregnancy planners completed a validated food frequency questionnaire at baseline. Pregnancy status was updated bimonthly for 12 months or until pregnancy. Fecundability ratios (FR) and 95% confidence intervals (CI) were estimated using multivariable proportional probabilities regression...
June 8, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28574299/quality-indicators-for-the-diagnosis-and-antibiotic-treatment-of-acute-respiratory-tract-infections-in-general-practice-a-rand-appropriateness-method
#14
Laura Trolle Saust, Lars Bjerrum, Magnus Arpi, Malene Plejdrup Hansen
OBJECTIVE: To develop quality indicators for the diagnosis and antibiotic treatment of acute respiratory tract infections, tailored to the Danish general practice setting. DESIGN: A RAND/UCLA Appropriateness Method was used. SETTING: General practice. SUBJECTS: A panel of nine experts, mainly general practitioners, was asked to rate the relevance of 64 quality indicators for the diagnosis and antibiotic treatment of acute respiratory tract infections based on guidelines...
June 2017: Scandinavian Journal of Primary Health Care
https://www.readbyqxmd.com/read/28562227/a-combinatorial-approach-to-induce-sensory-axon-regeneration-into-the-dorsal-root-avulsed-spinal-cord
#15
Jan Hoeber, Niclas König, Carl Trolle, Emilia Lekholm, Chunfang Zhou, Stanislava Pankratova, Elisabet Åkesson, Robert Fredriksson, Håkan Aldskogius, Elena N Kozlova
Spinal root injuries result in newly formed glial scar formation, which prevents regeneration of sensory axons causing permanent sensory loss. Previous studies showed that delivery of trophic factors or implantation of human neural progenitor cells supports sensory axon regeneration and partly restores sensory functions. In this study, we elucidate mechanisms underlying stem cell-mediated ingrowth of sensory axons after dorsal root avulsion (DRA). We show that human spinal cord neural stem/progenitor cells (hscNSPC), and also, mesoporous silica particles loaded with growth factor mimetics (MesoMIM), supported sensory axon regeneration...
July 15, 2017: Stem Cells and Development
https://www.readbyqxmd.com/read/28526836/characterisation-of-antibiotic-prescriptions-for-acute-respiratory-tract-infections-in-danish-general-practice-a-retrospective-registry-based-cohort-study
#16
Rune Aabenhus, Malene Plejdrup Hansen, Laura Trolle Saust, Lars Bjerrum
Inappropriate use of antibiotics is contributing to the increasing rates of antimicrobial resistance. Several Danish guidelines on antibiotic prescribing for acute respiratory tract infections in general practice have been issued to promote rational prescribing of antibiotics, however it is unclear if these recommendations are followed. We aimed to characterise the pattern of antibiotic prescriptions for patients diagnosed with acute respiratory tract infections, by means of electronic prescriptions, labeled with clinical indications, from Danish general practice...
May 19, 2017: NPJ Primary Care Respiratory Medicine
https://www.readbyqxmd.com/read/28497960/using-dynamic-covalent-chemistry-to-drive-morphological-transitions-controlled-release-of-encapsulated-nanoparticles-from-block-copolymer-vesicles
#17
Renhua Deng, Matthew J Derry, Charlotte J Mable, Yin Ning, Steven P Armes
Dynamic covalent chemistry is exploited to drive morphological order-order transitions to achieve the controlled release of a model payload (e.g., silica nanoparticles) encapsulated within block copolymer vesicles. More specifically, poly(glycerol monomethacrylate)-poly(2-hydroxypropyl methacrylate) (PGMA-PHPMA) diblock copolymer vesicles were prepared via aqueous polymerization-induced self-assembly in either the presence or absence of silica nanoparticles. Addition of 3-aminophenylboronic acid (APBA) to such vesicles results in specific binding of this reagent to some of the pendent cis-diol groups on the hydrophilic PGMA chains to form phenylboronate ester bonds in mildly alkaline aqueous solution (pH ∼ 10)...
June 7, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28486772/use-of-moist-oral-snuff-snus-and-pancreatic-cancer-pooled-analysis-of-nine-prospective-observational-studies
#18
Marzieh Araghi, Maria Rosaria Galanti, Michael Lundberg, Anton Lager, Gunnar Engström, Lars Alfredsson, Anders Knutsson, Margareta Norberg, Malin Sund, Patrik Wennberg, Ylva Trolle Lagerros, Rino Bellocco, Nancy L Pedersen, Per-Olof Östergren, Cecilia Magnusson
While smoking is a well-established risk factor for pancreatic cancer, the effect of smokeless tobacco is less well understood. We used pooled individual data from the Swedish Collaboration on Health Effects of Snus Use to assess the association between Swedish snus use and the risk of pancreatic cancer. A total of 424,152 male participants from nine cohort studies were followed up for risk of pancreatic cancer through linkage to health registers. We used shared frailty models with random effects at the study level, to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) adjusted for confounding factors...
August 15, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/28446496/mobile-based-intervention-intended-to-stop-obesity-in-preschool-aged-children-the-ministop-randomized-controlled-trial
#19
RANDOMIZED CONTROLLED TRIAL
Christine Delisle Nyström, Sven Sandin, Pontus Henriksson, Hanna Henriksson, Ylva Trolle-Lagerros, Christel Larsson, Ralph Maddison, Francisco B Ortega, Jeremy Pomeroy, Jonatan R Ruiz, Kristin Silfvernagel, Toomas Timpka, Marie Löf
Background: Traditional obesity prevention programs are time- and cost-intensive. Mobile phone technology has been successful in changing behaviors and managing weight; however, to our knowledge, its potential in young children has yet to be examined.Objective: We assessed the effectiveness of a mobile health (mHealth) obesity prevention program on body fat, dietary habits, and physical activity in healthy Swedish children aged 4.5 y.Design: From 2014 to 2015, 315 children were randomly assigned to an intervention or control group...
June 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28397673/-tracheotomy
#20
Marianne Kromann Nielsen, Erik Gustav Hägerström, Waldemar Trolle
The number of tracheotomies in Denmark has roughly tripled over the past 15 years. During this period, percutaneous dilatational tracheotomy has become still more common because of its easier accessibility, and it accounted for 66% of all tracheotomies in 2015 vs. 9% in 2000. However, due to the risk of fatal complications the method is only applicable when anatomical and medical conditions are favourable. Surgical tracheotomy is a safer method in some patients, and it is preferred if the patient has had a tracheostomy previously or presents with a difficult anatomy, coagulopathy or previous neck irradiation...
February 13, 2017: Ugeskrift for Laeger
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