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https://www.readbyqxmd.com/read/27931747/genetic-diversity-and-population-structure-of-food-borne-staphylococcus-carnosus-strains
#1
Anne Bückle Née Müller, Markus Kranz, Herbert Schmidt, Agnes Weiss
The species Staphylococcus carnosus is a non-pathogenic representative of the coagulase negative staphylococci. Specific strains are applied as meat starter cultures. The species consists of two subspecies, S. carnosus ssp. carnosus and S. carnosus ssp. utilis. In order to place S. carnosus strains, characterized in former studies, in a genetic background that allows a typing of candidates for starter cultures, a Multilocus Sequence Typing (MLST) scheme was developed. Internal fragments of the genes tpiA, xprT, dat, gmk, glpK, narG, cstA, encoding triosephosphate isomerase, xanthine phosphoribosyltransferase, d-amino acid aminotransferase, guanylate kinase, glycerol kinase, the α-chain of the respiratory nitrate reductase, and a carbon starvation protein where chosen...
November 30, 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/27930314/direct-evidence-of-interaction-induced-dirac-cones-in-a-monolayer-silicene-ag-111-system
#2
Ya Feng, Defa Liu, Baojie Feng, Xu Liu, Lin Zhao, Zhuojin Xie, Yan Liu, Aiji Liang, Cheng Hu, Yong Hu, Shaolong He, Guodong Liu, Jun Zhang, Chuangtian Chen, Zuyan Xu, Lan Chen, Kehui Wu, Yu-Tzu Liu, Hsin Lin, Zhi-Quan Huang, Chia-Hsiu Hsu, Feng-Chuan Chuang, Arun Bansil, X J Zhou
Silicene, analogous to graphene, is a one-atom-thick 2D crystal of silicon, which is expected to share many of the remarkable properties of graphene. The buckled honeycomb structure of silicene, along with enhanced spin-orbit coupling, endows silicene with considerable advantages over graphene in that the spin-split states in silicene are tunable with external fields. Although the low-energy Dirac cone states lie at the heart of all novel quantum phenomena in a pristine sheet of silicene, a hotly debated question is whether these key states can survive when silicene is grown or supported on a substrate...
December 7, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27911111/outcomes-of-scleral-buckle-removal-experience-from-the-last-decade
#3
Elad Moisseiev, Miri Fogel, Ido Didi Fabian, Adiel Barak, Joseph Moisseiev, Amir Alhalel
PURPOSE: To evaluate the indications, outcomes, and complications of scleral buckle removal over the past decade and compare to previously published data. METHODS: Forty nine eyes of 49 patients who underwent scleral buckle removal and had at least 6 months of follow-up were included in this retrospective study. Recorded parameters included demographic information, history of the retinal detachment, details of the scleral buckling surgery, indication for scleral buckle removal, time from scleral buckle placement to removal, culture results, length of follow up, visual acuity (VA) throughout the follow up, and the occurrence of any complications or need for additional surgery after scleral buckle removal...
December 2, 2016: Current Eye Research
https://www.readbyqxmd.com/read/27906810/a-comparative-analysis-of-goldmann-tonometry-correction
#4
Magdalena Asejczyk-Widlicka, Wieslaw Srodka, Barbara K Pierscionek
PURPOSE: The measurement of intraocular pressure (IOP) by Goldmann applanation tonometry (GAT) is based on assumptions about corneal parameters. To correct for variations in corneal curvature and thickness, a number of equations have been proposed. This study evaluates the in vivo accuracy of these equations from individuals with primary open-angle glaucoma and compared them with measurements taken using the Pascal dynamic contour tonometer (DCT), which makes no assumptions about the corneal geometry or biomechanics...
November 30, 2016: Journal of Glaucoma
https://www.readbyqxmd.com/read/27906739/posterior-vertebral-column-resection-with-intraoperative-manual-retraction-for-the-treatment-of-posttubercular-kyphosis-in-upper-thoracic-spine-or-cervicothoracic-junction
#5
Yuqiao Chen, Guohua Lü, Bing Wang, Lei Li, Lei Kuang
STUDY DESIGN: This is a case-series. OBJECTIVE: To evaluate the clinical and radiologic outcomes of posterior vertebral column resection (PVCR) for treatment of posttubercular kyphosis in upper thoracic spine and cervicothoracic junction (CTJ). SUMMARY OF BACKGROUND DATA: Surgical management of severe posttubercular kyphosis in upper thoracic spine or CTJ is challenging. A new technique that combines PVCR and intraoperative manual traction in a single procedure, was developed to maximize the correction rate and minimize the risk of dural buckling and spinal cord injury...
November 30, 2016: Clinical Spine Surgery
https://www.readbyqxmd.com/read/27903623/tread-lightly-insect-tibias-buckle-under-pressure
#6
Casey Gilman
No abstract text is available yet for this article.
December 1, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27903522/dietary-patterns-explaining-differences-in-bone-mineral-density-and-hip-structure-in-the-elderly-the-rotterdam-study
#7
Ester Al de Jonge, Jessica C Kiefte-de Jong, Albert Hofman, André G Uitterlinden, Brenda Ct Kieboom, Trudy Voortman, Oscar H Franco, Fernando Rivadeneira
BACKGROUND: Evidence on the association between dietary patterns, measures of hip bone geometry, and subsequent fracture risk are scarce. OBJECTIVE: The objective of this study was to evaluate whether dietary patterns that explain most variation in bone mineral density (BMD) and hip bone geometry are associated with fracture risk. DESIGN: We included 4028 subjects aged ≥55 y from the Rotterdam study. Intake of 28 food groups was assessed with the use of food-frequency questionnaires...
November 30, 2016: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/27900580/buckling-analysis-of-defective-cross-linked-functionalized-single-and-double-walled-carbon-nanotubes-with-polyethylene-chains-using-molecular-dynamics-simulations
#8
S Ajori, R Ansari, H Parsapour
Functionalized carbon nanotubes (CNTs) can be used for improving the mechanical properties and load transfer in nanocomposites. In this research, the buckling behavior of perfect and defective cross-linked functionalized CNTs with polyethylene (PE) chains is studied employing molecular dynamics (MD) simulations. Two different configurations with the consideration of vacancy defects, namely mapped and wrapped, are selected. According to the results, critical buckling force of cross-linked functionalized CNTs with PE chains increases as compared to pure CNTs, especially in the case of double-walled carbon nanotubes (DWCNTs)...
December 2016: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/27899318/new-wrinkling-substrate-assay-reveals-traction-force-fields-of-leader-and-follower-cells-undergoing-collective-migration
#9
Sho Yokoyama, Tsubasa S Matsui, Shinji Deguchi
Physical forces play crucial roles in coordinating collective migration of epithelial cells, but details of such force-related phenomena remain unclear partly due to the lack of robust methodologies to probe the underlying force fields. Here we develop a method for fabricating silicone substrates that detect cellular traction forces with a high sensitivity. Specifically, a silicone elastomer is exposed to oxygen plasma under heating. Removal of the heat shrinks the substrate so as to reduce its critical buckling strain in a spatially uniform manner...
November 27, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27895362/a-review-of-scleral-buckle-procedures-performed-at-a-tertiary-care-center-in-karachi-pakistan
#10
Farzeen Khalid Hashmi, Umair Razaque Arain, Azam Ali, Khabir Ahmad
This retrospective study was done to evaluate the visual and anatomic outcomes of scleral buckling for the repair of rhegmatogenous retinal detachment (RRD). All scleral buckle procedures performed at the Aga Khan University Hospital, Karachi, from May 1999 to April 2012 were included. A total of 75 eyes of 72 patients were studied. The mean age of patients at surgery was 33.0±17.2 years. The mean logarithm of the minimum angle of resolution (logMAR) visual acuity (VA) was 0.9±0.8 pre-operatively and 0.5±0...
October 2016: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/27890677/time-course-of-organ-of-corti-degeneration-after-noise-exposure
#11
Barbara A Bohne, Melissa Kimlinger, Gary W Harding
From our permanent collection of plastic-embedded flat preparations of chinchilla cochleae, 22 controls and 199 ears from noise-exposed animals were used to determine when, postexposure, hair cell (HC) and supporting cell (SC) degeneration were completed. The exposed ears were divided into four groups based on exposure parameters: 0.5- or 4-kHz octave band of noise at moderate (M) or high (H) intensities. Postexposure survival ranged from <1 h to 2.5 y. Ears fixed ≤ 0-12 h postexposure were called 'acute'...
November 24, 2016: Hearing Research
https://www.readbyqxmd.com/read/27890575/3d-hybrid-modelling-of-vascular-network-formation
#12
Holger Perfahl, Barry D Hughes, Tomás Alarcón, Philip K Maini, Mark C Lloyd, Matthias Reuss, Helen M Byrne
We develop an off-lattice, agent-based model to describe vasculogenesis, the de novo formation of blood vessels from endothelial progenitor cells during development. The endothelial cells that comprise our vessel network are viewed as linearly elastic spheres that move in response to the forces they experience. We distinguish two types of endothelial cells: vessel elements are contained within the network and tip cells are located at the ends of vessels. Tip cells move in response to mechanical forces caused by interactions with neighbouring vessel elements and the local tissue environment, chemotactic forces and a persistence force which accounts for their tendency to continue moving in the same direction...
November 24, 2016: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/27869203/no-effect-of-natural-transformation-on-the-evolution-of-resistance-to-bacteriophages-in-the-acinetobacter-baylyi-model-system
#13
Amy McLeman, Pawel Sierocinski, Elze Hesse, Angus Buckling, Gabriel Perron, Nils Hülter, Pål Jarle Johnsen, Michiel Vos
The adaptive benefits of natural transformation, the active uptake of free DNA molecules from the environment followed by incorporation of this DNA into the genome, may be the improved response to selection resulting from increased genetic variation. Drawing analogies with sexual reproduction, transformation may be particularly beneficial when selection rapidly fluctuates during coevolution with virulent parasites ('the Red Queen Hypothesis'). Here we test this hypothesis by experimentally evolving the naturally transformable and recombinogenic species Acinetobacter baylyi with a cocktail of lytic phages...
November 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27862566/host-diversity-limits-the-evolution-of-parasite-local-adaptation
#14
Daniel Morley, Jenny M Broniewski, Edze R Westra, Angus Buckling, Stineke van Houte
Specificity in the interactions between hosts and their parasites can lead to local adaptation. However, the degree of local adaptation is predicted to depend upon the diversity of resistance alleles within the host population; increasing host diversity should decrease mean parasite infectivity and hence reduce local adaptation. In this study we empirically test this prediction using the highly specific interactions between bacteria with CRISPR-Cas immunity and their bacteriophage. Bacteria acquire immunity to phage by incorporating a phage-derived spacer sequence into CRISPR loci on the host genome, and phage can escape the CRISPR-mediated immunity of a specific clone by mutating the targeted sequence...
November 14, 2016: Molecular Ecology
https://www.readbyqxmd.com/read/27862412/infertility-associated-with-the-absence-of-endometrial-progesterone-receptors-in-a-bitch
#15
J C Dockweiler, B Cossic, C G Donnelly, R O Gilbert, E Buckles, S H Cheong
A three-year-old intact female Old English sheepdog was presented for evaluation of infertility. A uterine biopsy was performed during dioestrus, and the microscopic appearance was inconsistent with progesterone stimulation; the glands were sparse, simple and failed to show coiling, while the glandular epithelium was cuboidal instead of columnar. There was very little evidence of glandular activity. Due to the inappropriate appearance of the glands for the stage of the cycle, immunohistochemistry for progesterone receptors was performed...
November 14, 2016: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/27860442/primary-rhegmatogenous-retinal-detachment-surgical-methods-and-anatomical-outcome
#16
Marta Haugstad, Stefan Moosmayer, Ragnheiður Bragadόttir
PURPOSE: The aim of the study was to evaluate the anatomical success of surgical management of primary rhegmatogenous retinal detachment (RRD) and to compare the anatomical outcomes from different surgical techniques. METHODS: During 2012, 517 consecutive eyes (514 patients) were operated by 11 surgeons at the Department of Ophthalmology, Oslo University Hospital. Patient records were retrospectively analysed with no exclusions. Main outcome measures were primary and final anatomical success...
November 18, 2016: Acta Ophthalmologica
https://www.readbyqxmd.com/read/27853956/catheter-guided-suprachoroidal-buckling-of-rhegmatogenous-retinal-detachments-secondary-to-peripheral-retinal-breaks
#17
Mikel Mikhail, Ehab N El-Rayes, Kentaro Kojima, Radwan Ajlan, Flavio Rezende
PURPOSE: To evaluate functional and anatomic outcomes of eyes undergoing suprachoroidal buckling (SCB) using a specially designed catheter for the management of rhegmatogenous retinal detachment (RRD) secondary to peripheral retinal breaks. METHODS: Retrospective cohort study of 62 eyes of 62 patients. Subjects underwent SCB for the management of RRD secondary to single or multiple retinal breaks. Suprachoroidal indentation was achieved through the introduction of viscoelastic material in the suprachoroidal space overlying the break using an illuminated, 450 μm-wide, flex-tip catheter...
November 16, 2016: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/27853953/scleral-buckling-versus-vitrectomy-can-the-trend-be-reversed-suprachoroidally
#18
EDITORIAL
David Wong, Lara Sandri, David H W Steel
No abstract text is available yet for this article.
November 16, 2016: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/27853312/the-structure-and-dynamics-of-nano-particles-encapsulated-by-the-sds-monolayer-collapse-at-the-water-tce-interface
#19
Wenxiong Shi
The super-saturated surfactant monolayer collapses with the nanoparticles (NPs) at the water/trichloroethylene (TCE) interface are investigated using molecular dynamics (MD) simulations. The results show that sodium alkyl sulfate (SDS) monolayer collapse is initiated by buckling and followed primarily by budding and the bud encapsulating the NPs and oil molecules. The developed bud detaches from the monolayer into a water phase and forms the swollen micelle emulsion with NPs and oil molecules. We investigate the wavelength of the initial budding and the theoretical description of the budding process...
November 17, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27845341/long-term-proton-pump-inhibitor-use-is-not-associated-with-changes-in-bone-strength-and-structure
#20
Laura E Targownik, Andrew L Goertzen, Yunhua Luo, William D Leslie
OBJECTIVES: Multiple studies have reported an association between proton pump inhibitor (PPI) use and fracture. However, the causality of this association is questionable, as there is not a well defined mechanism of action, nor is there evidence of an effect on PPIs on areal bone mineral density (aBMD) using dual photon X-ray absorptiometry (DXA). It is possible that PPIs may induce changes in bone structure which would predispose to fracture in the absence of changes in aBMD. We used three-dimensional quantitative computed tomography (3D-QCT) imaging to determine if long-term PPI use was associated with structural changes in bone independent of aBMD...
November 15, 2016: American Journal of Gastroenterology
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