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https://www.readbyqxmd.com/read/29793183/environmental-radionuclides-as-contaminants-of-hpge-gamma-ray-spectrometers-monte-carlo-simulations-for-modane-underground-laboratory
#1
R Breier, V B Brudanin, P Loaiza, F Piquemal, P P Povinec, E Rukhadze, N Rukhadze, I Štekl
The main limitation in the high-sensitive HPGe gamma-ray spectrometry has been the detector background, even for detectors placed deep underground. Environmental radionuclides such as 40 K and decay products in the 238 U and 232 Th chains have been identified as the most important radioactive contaminants of construction parts of HPGe gamma-ray spectrometers. Monte Carlo simulations have shown that the massive inner and outer lead shields have been the main contributors to the HPGe-detector background, followed by aluminum cryostat, copper cold finger, detector holder and the lead ring with FET...
May 21, 2018: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29793157/energy-dissipation-in-quasi-linear-viscoelastic-tissues-cells-and-extracellular-matrix
#2
Behzad Babaei, A J Velasquez-Mao, Kenneth M Pryse, William B McConnaughey, Elliot L Elson, Guy M Genin
Characterizing how a tissue's constituents give rise to its viscoelasticity is important for uncovering how hidden timescales underlie multiscale biomechanics. These constituents are viscoelastic in nature, and their mechanics must typically be assessed from the uniaxial behavior of a tissue. Confounding the challenge is that tissue viscoelasticity is typically associated with nonlinear elastic responses. Here, we experimentally assessed how fibroblasts and extracellular matrix (ECM) within engineered tissue constructs give rise to the nonlinear viscoelastic responses of a tissue...
May 21, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29793156/mechanical-properties-of-the-human-scalp-in-tension
#3
Lisa Falland-Cheung, Mario Scholze, Pamela F Lozano, Benjamin Ondruschka, Darryl C Tong, Paul A Brunton, J Neil Waddell, Niels Hammer
Mechanical properties of the human scalp have not been investigated to a great extent with limited information available. The purpose of this study was to provide new baseline material data for human scalp tissue of various ages, which can be applied to experimental and constitutive models, such as in the area of impact biomechanics. This study used specimens from the left and right temporal, fronto-parietal and occipital regions of the human scalp. It investigated the tensile behavior of scalp tissue using tissues harvested from unfixed, fresh cadavers...
May 17, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29793107/biofiltration-of-methane-using-hybrid-mixtures-of-biochar-lava-rock-and-compost
#4
Helen La, J Patrick A Hettiaratchi, Gopal Achari, Tobin J Verbeke, Peter F Dunfield
Using hybrid packing materials in biofiltration systems takes advantage of both the inorganic and organic properties offered by the medium including structural stability and a source of available nutrients, respectively. In this study, hybrid mixtures of compost with either lava rock or biochar in four different mixture ratios were compared against 100% compost in a methane biofilter with active aeration at two ports along the height of the biofilter. Biochar outperformed lava rock as a packing material by providing the added benefit of participating in sorption reactions with CH4 ...
May 21, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29793074/cross-linked-electrospun-cartilage-acellular-matrix-poly-caprolactone-co-lactide-co-glycolide-nanofiber-as-an-antiadhesive-barrier
#5
Jin Woo Lee, Joon Yeong Park, Seung Hun Park, Min Ju Kim, Bo Ram Song, Hee-Woong Yun, Tae Woong Kang, Hak Soo Choi, Young Jick Kim, Byoung Hyun Min, Moon Suk Kim
In this work, we chose cartilage acellular matrix (CAM) as a promising antiadhesive material because CAM effectively inhibits the formation of blood vessels, and we used electrospinning to prepare antiadhesive barriers. Additionally, we synthesized N-hydroxysuccinimide (NHS)-poly(caprolactone-co-lactide-co-glycolide)-NHS (MP) copolymers (to tune degradation) as a cross-linking agent for CAM. This is the first report on the development of electrospun cross-linked (Cx) CAM/MP (CA/P) nanofiber (NF) (Cx-CA/P-NF) with a tunable degradation period as an antiadhesive barrier...
May 21, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29793064/industrial-waste-as-a-source-of-surface-and-groundwater-pollution-for-more-than-half-a-century-in-a-sector-of-the-r%C3%A3-o-de-la-plata-coastal-plain-argentina
#6
Lucía Santucci, Eleonora Carol, Carolina Tanjal
Environmental liabilities have become one of the most important problems of the last years, especially those of contaminated sites located in urban areas which have been abandoned by pollution intensive industries. Such sites may contain hazardous materials that pose risks to human health and the environment. Industrial waste from the ancient sulfuric acid industry is scattered in a local area at the petrochemical pole in a sector of the Río de la Plata coastal plain. The aim of this work is to define the geochemical processes that determine the alteration of waste in the old sulfuric acid industry (OSAI) area and to study the migration of soluble pollutants to groundwater...
May 14, 2018: Chemosphere
https://www.readbyqxmd.com/read/29793039/antimicrobial-resistance-in-the-context-of-the-syrian-conflict-drivers-before-and-after-the-onset-of-conflict-and-key-recommendations
#7
REVIEW
Aula Abbara, Timothy M Rawson, Nabil Karah, Wael El-Amin, James Hatcher, Bachir Tajaldin, Osman Dar, Omar Dewachi, Ghassan Abu Sitta, Bernt Eric Uhlin, Annie Sparrow
Current evidence describing antimicrobial resistance (AMR) in the context of the Syrian conflict is of poor quality and sparse in nature. In this paper we explore and report the major drivers of AMR that were present in Syria pre-conflict and those that have emerged since its onset in March 2011. Drivers which existed before the conflict included a lack of enforcement of existing legislation to regulate over the counter antibiotics and notification of communicable diseases. This contributed to a number of drivers of AMR after the onset of conflict which were also compounded by the exodus of trained staff, the increase in overcrowding and unsanitary conditions, the increase in injuries and economic sanctions limiting the availability of required laboratory medical materials and equipment...
May 21, 2018: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/29792999/does-solid-fusion-eliminate-rod-fracture-after-pedicle-subtraction-osteotomy-in-ankylosing-spondylitis-related-thoracolumbar-kyphosis
#8
Shi-Zhou Zhao, Bang-Ping Qian, Mu Qiao, Jun Jiang, Yong Qiu
BACKGROUND CONTEXT: Rod fracture (RF) has a negative impact on the surgical outcome of ankylosing spondylitis (AS) patients following lumbar pedicle subtraction osteotomy (PSO). However, there is a paucity of published studies analyzing the risk factors for RF in PSO-treated AS patients with thoracolumbar kyphosis. PURPOSE: To investigate the risk factors for RF after PSO for thoracolumbar kyphosis secondary to AS. STUDY DESIGN/SETTING: Retrospective single-center study...
May 21, 2018: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29792987/the-rheological-and-textural-characterization-of-soluplus-%C3%A2-vitamin-e-composites
#9
Ahmad Salawi, Sami Nazzal
Soluplus® is a graft amphiphilic copolymer that is frequently used as an excipient in solid dosage forms as a dissolution and a solubility enhancer. We discovered that Soluplus® can be dissolved in vitamin E. The result is a tacky and highly adhesive material. Our research objective was to evaluate the rheological, adhesive, and textural properties of the Soluplus® /Vitamin E composites. In this study, Soluplus® was dissolved under heat in vitamin E at increasing concentrations from 0 to 40% (by weight)...
May 21, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29792961/composite-films-of-regenerate-cellulose-with-chitosan-and-polyvinyl-alcohol-evaluation-of-water-adsorption-mechanical-and-optical-properties
#10
Patricia Cazón, Manuel Vázquez, Gonzalo Velazquez
The aim of this study was to develop composite films from cellulose, chitosan and polyvinyl alcohol to obtain environmentally friendly materials. Toughness, burst strength, distance to burst and water adsorption properties were measured and analysed as a function of cellulose (3-5%), chitosan (0-1%) and polyvinyl alcohol (0-4%) contents. Polynomial models were obtained. Light-barrier properties, transparency, morphology, structural and thermal analyses were assessed. Results showed that chitosan and polyvinyl alcohol enhanced the mechanical properties of cellulose-based films...
May 21, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29792956/development-of-photo-modified-starch-kefiran-tio-2-bio-nanocomposite-as-an-environmentally-friendly-food-packaging-material
#11
Vahid Goudarzi, Iman Shahabi-Ghahfarrokhi
This paper reports on an experiment in which starch/kefiran/TiO2 (SKT)-based bio-nanocomposite films were developed and modified by photo-chemical reaction. In so doing, film-forming solutions were exposed to ultraviolet A (UV-A) for different times (1, 6, and 12 h). The obtained results indicated that increasing UV-A exposure time brought about an increase (≈14.9%) in the tensile strength of bio-nanocomposites. However, elongation at break and Young's modulus of irradiated film specimen decreased (≈32%, ≈12%, respectively) by increasing UV-A exposure time, and the moisture-sensitive parameters of specimen decreased using UV-A irradiation...
May 21, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29792944/enrichment-of-low-density-symbiont-dna-from-minute-insects
#12
Corinne M Stouthamer, Suzanne Kelly, Martha S Hunter
Symbioses between bacteria and insects are often associated with changes in important biological traits that can significantly affect host fitness. To a large extent, studies of these interactions have been based on physiological changes or induced phenotypes in the host, and the genetic mechanisms by which symbionts interact with their hosts have only recently become better understood. Learning about symbionts has been challenging in part due to difficulties such as obtaining enough high quality genomic material for high throughput sequencing technology, especially for symbionts present in low titers, and in small or difficult to rear non-model hosts...
May 21, 2018: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/29792924/creation-of-an-acellular-vaginal-matrix-for-potential-vaginal-augmentation-and-cloacal-repair
#13
K V Greco, L G Jones, I Obiri-Yeboa, T Ansari
STUDY OBJECTIVE: our aim was to use porcine vagina to create a vaginal matrix and test its cellular biocompatibility. DESIGN: vagina was harvested from pigs and de-cellularised (DC) using a combination of detergents (Triton x-100 and sodium deoxycholate) and enzymes (DNAse/RNAse). INTERVENTIONS: the presence of cellular material, collagen structural integrity and basement membrane proteins were assessed histologically. To address cytocompatibility, porcine adipose derived-mesenchymal stem cells (AD-MSC) were harvested from abdominal fat together with vaginal epithelial cells (VEC) and seeded onto the mucosal aspect of the vaginal scaffold...
May 21, 2018: Journal of Pediatric and Adolescent Gynecology
https://www.readbyqxmd.com/read/29792919/seeing-the-light-shifting-from-wild-rhizomes-to-extraction-of-active-ingredients-from-above-ground-parts-of-paris-polyphylla-var-yunnanensis
#14
Xu-Jie Qin, Wei Ni, Chang-Xiang Chen, Hai-Yang Liu
ETHNOPHARMACOLOGICAL RELEVANCE: The dried rhizomes of Paris polyphylla var. yunnanensis are widely used in traditional Chinese medicine (TCM) as hemostatic, antitumor, and antimicrobial agents. More than 70 Chinese patent medicines are based on P. polyphylla var. yunnanensis rhizomes. Steroidal saponins are considered as the main active ingredients of these rhizomes. However, wild populations of P. polyphylla var. yunnanensis are greatly threatened due to the illegal wild harvest and over-utilization of the rhizomes...
May 21, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29792891/pcl-eug-scaffolds-with-tunable-stiffness-can-regulate-macrophage-secretion-behavior
#15
REVIEW
Y Z B Xue, Yiming Niu, B Tang, C M Wang
Osteoarthritis (OA) is a prevalent joint disorder worldwide. Recent studies suggested that macrophages play an important role in the progression of OA. However, the detailed pathology related to macrophages is still ambiguous, especially those related to mechanotransduction. In this study, PCL/EUG composite scaffolds were first fabricated by electrospinning. The stiffness of as-fabricated scaffolds was controlled by adjusting the PCL-versus-EUG ratio. The mechanical properties, structural characterics and chemical composition of the scaffolds were investigated using various materials characterization techniques...
May 21, 2018: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/29792822/genetic-identity-in-genebanks-application-of-the-solcap-12k-snp-array-in-fingerprinting-and-diversity-analysis-in-the-global-in-trust-potato-collection
#16
David Ellis, Oswaldo Chavez, Joseph J Coombs, Julian V Soto, Rene Gomez, David S Douches, Ana Panta, Rocio Silvestre, Noelle Lynette Anglin
Breeders rely on genetic integrity of material from genebanks, however, mislabeling and errors in original data can occur. Paired samples of original material and their in vitro counterparts from 250 diverse potato landrace accessions from the International Potato Center (CIP), were fingerprinted using the Infinium 12K V2 Potato Array to confirm genetic identity and evaluate genetic diversity. Diploid, triploid, and tetraploid accessions were included representing seven cultivated potato taxa (Hawkes, 1990)...
May 24, 2018: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/29792812/ultralow-damping-in-nanometer-thick-epitaxial-spinel-ferrite-thin-films
#17
Satoru Emori, Di Yi, Sam Crossley, Jacob J Wisser, Purnima P Balakrishnan, Behrouz Khodadadi, Padraic Shafer, Christoph Klewe, Alpha T N'Diaye, Brittany T Urwin, Krishnamurthy Mahalingam, Brandon Howe, Harold Y Hwang, Elke Arenholz, Yuri Suzuki
Pure spin currents, unaccompanied by dissipative charge flow, are essential for realizing energy-efficient nanomagnetic information and communications devices. Thin-film magnetic insulators have been identified as promising materials for spin-current technology, since they are thought to exhibit lower damping compared to their metallic counterparts. However, insulating behavior is not a sufficient requirement for low damping, as evidenced by the very limited options for low-damping insulators. Here, we demonstrate a new class of nanometer-thick ultralow-damping insulating thin films, based on design criteria that minimize orbital angular momentum and structural disorder...
May 24, 2018: Nano Letters
https://www.readbyqxmd.com/read/29792809/thionine-self-assembled-structures-on-graphene-formation-organization-and-doping
#18
Thiago Sousa, Thales Fernando Damasceno Fernandes, Matheus J S Matos, Eduardo Nery Duarte Araujo, Mario S C Mazzoni, Bernardo R A Neves, Flávio Plentz
The association of organic molecules with 2D materials, creating hybrid systems with mutual influences, constitutes an important testbed for both basic science self-assembly studies and perspective applications. Following this concept, in this work, we show a rich phenomenology that is involved in the interaction of thionine with graphene, leading to a hybrid material formed by well-organized self-assembled structures atop graphene. This composite system is investigated by atomic force microscopy, electric transport measurements, and first principles calculations, which show: 1) an interesting time evolution of thionine self-assembled structures atop graphene; 2) the final molecular assembly is highly oriented (in accordance with the underlying graphene surface symmetry); and 3) thionine introduces a strong n-type doping effect in graphene...
May 24, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29792803/macroporous-enabled-highly-deformable-layered-hydrogels-with-designed-ph-response
#19
Minggan Li, Dehi Joung, Dae Kun Hwang
Environment responsive hydrogel structures are of great interests in materials research and have a wide range of applications. By using a flow lithography technique, we report a one-step and high throughput fabrication method for the synthesis of highly pH-responsive hydrogels with designed shape transformations. In this method, heterogeneous hydrogels with porous and nonporous layers are synthesized using a single UV exposure in a microfluidic channel. During the UV polymerization the porous layers, which are formed by using polymerization induced phase separation (PIPS), significantly increase the swelling capability and enhance the swelling rate of the hydrogels...
May 24, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29792802/the-anti-biofouling-properties-of-superhydrophobic-surfaces-are-short-lived
#20
Gi Byoung Hwang, Kristopher Page, Adnan Patir, Sean P Nair, Elaine Allan, Ivan P Parkin
Superhydrophobic surfaces are present in nature on the leaves of many plant species. Water rolls on these surfaces and the rolling motion picks up particles including bacteria and viruses. Man-made superhydrophobic surfaces have been made in an effort to reduce biofouling. We show here that the anti-biofouling property of a superhydrophobic surface is due to an entrapped air-bubble layer that reduces contact between the bacteria and the surface. Further, we show that prolonged immersion of superhydrophobic surfaces in water led to loss of the bubble-layer and subsequent bacterial adhesion that unexpectedly, exceeded that of the control materials...
May 24, 2018: ACS Nano
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