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https://www.readbyqxmd.com/read/27842715/characterization-of-microplastic-and-mesoplastic-debris-in-sediments-from-kamilo-beach-and-kahuku-beach-hawai-i
#1
Alan M Young, James A Elliott
Sediment samples were collected from two Hawai'ian beaches, Kahuku Beach on O'ahu and Kamilo Beach on the Big Island of Hawai'i. A total of 48,988 large microplastic and small mesoplastic (0.5-8mm) particles were handpicked from the samples and sorted into four size classes (0.5-1mm, 1-2mm, 2-4mm, 4-8mm) and nine color categories. For all sizes combined the most common plastic fragment color was white/transparent (71.8%) followed by blue (8.5%), green (7.5%), black/grey (7.3%), red/pink (2.6%), yellow (1.2%), orange (0...
November 11, 2016: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/27767188/detection-of-gravitational-wave-emission-by-supermassive-black-hole-binaries-through-tidal-disruption-flares
#2
Kimitake Hayasaki, Abraham Loeb
Galaxy mergers produce supermassive black hole binaries, which emit gravitational waves prior to their coalescence. We perform three-dimensional hydrodynamic simulations to study the tidal disruption of stars by such a binary in the final centuries of its life. We find that the gas stream of the stellar debris moves chaotically in the binary potential and forms accretion disks around both black holes. The accretion light curve is modulated over the binary orbital period owing to relativistic beaming. This periodic signal allows to detect the decay of the binary orbit due to gravitational wave emission by observing two tidal disruption events that are separated by more than a decade...
October 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27649400/a-retrospective-study-of-onychomycosis-clinical-diagnosis-versus-laboratory-diagnosis
#3
Arwa M El-Sayed, Marc Karpo, Aisha Jasani, Ebony Love, Lesly Robinson
INTRODUCTION AND OBJECTIVES: Onychomycosis is defined as a fungal infection of the nail usually caused by a dermatophyte. This retrospective study will compare the diagnosis of onychomycosis based on clinical exam findings in comparison to laboratory results. METHODS: Clinical diagnosis of onychomycosis of the nail is made through visual inspection of the nail. The characteristics that define a clinical diagnosis of onychomycosis include but is not limited to: thickness of nail, discoloration (yellow, black, and/or brown), crumbly texture, subungual debris, subungual fluid, splitting of the nail, and/or nail dystrophy...
September 2016: Journal of the American Podiatric Medical Association
https://www.readbyqxmd.com/read/27580527/failure-rates-of-asian-type-anatomic-medullary-locking-stemmed-metal-on-metal-total-hip-replacement-a-cause-for-adverse-tissue-reactions-to-metal-debris-armd
#4
Masaru Nakamura, Tateaki Shimakawa, Shunji Nakano, Takashi Chikawa, Shinji Yoshioka, Masahiro Kashima, Shunichi Toki, Hidehisa Horiguchi, Koichi Sairyo
BACKGROUND: Adverse tissue reaction to metal debris (ARMD) as a secondary complication of Metal-on-metal total hip replacement (MoM THR) has been of concern. We have been performing cementless MoM THR using an Asian-type anatomic medullary locking (AML) stem. The purpose of this study is to examine the incident rate of ARMD, and the implant survival rate. METHODS: The study included 187 patients (211 hip joints) who underwent MoM THR between February 2007 and November 2009 at our hospital and who were followed up for a minimum of 6 years...
August 28, 2016: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/27453685/the-%C3%AE-ray-afterglows-of-tidal-disruption-events
#5
Xian Chen, Germán Arturo Gómez-Vargas, James Guillochon
A star wandering too close to a supermassive black hole (SMBH) will be tidally disrupted. Previous studies of such 'tidal disruption event' (TDE) mostly focus on the stellar debris that are bound to the system, because they give rise to luminous flares. On the other hand, half of the stellar debris in principle are unbound and can stream to a great distance, but so far there is no clear evidence that this 'unbound debris stream' (UDS) exists. Motivated by the fact that the circum-nuclear region around SMBHs is usually filled with dense molecular clouds (MCs), here we investigate the observational signatures resulting from the collision between an UDS and an MC, which is likely to happen hundreds of years after a TDE...
May 21, 2016: Monthly Notices of the Royal Astronomical Society
https://www.readbyqxmd.com/read/27376956/damage-mechanisms-at-the-cement-implant-interface-of-polished-cemented-femoral-stems
#6
Natalie Shearwood-Porter, Martin Browne, James A Milton, Matthew J Cooper, Martin R Palmer, Jeremy M Latham, Robert J K Wood, Richard B Cook
The occurrence of damage on polished femoral stems has been widely reported in the literature, and bone cement has been implicated in a tribocorrosive failure process. However, the mechanisms of cement-mediated damage and the impact of cement formulation on this process are not well understood. In this study, 13 Zimmer CPT polished femoral stems, and the corresponding cement specimens were retrieved at revision surgery and analyzed using high-resolution imaging techniques. Surface damage attributed to tribocorrosion was observed on all stems...
July 4, 2016: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/27172284/metallosis-presenting-as-a-progressive-neurologic-deficit-four-years-after-a-posterior-spinal-fusion-for-adolescent-idiopathic-scoliosis-a-case-report
#7
Seth H Richman, Andrew J Razzano, Melanie A Morscher, Patrick M Riley
STUDY DESIGN: Case report. OBJECTIVE: To report a case of progressive pain and paraparesis secondary to metallosis four years after a pediatric posterior spinal fusion (PSF). SUMMARY OF BACKGROUND DATA: Metallosis as a late complication of pediatric spinal surgery is rarely reported. Myelographic computed tomography (CT) can be helpful in establishing the diagnosis. The use of serum chromium levels as a means of definitive diagnosis has been suggested, but has only been reported retrospectively...
May 11, 2016: Spine
https://www.readbyqxmd.com/read/27037662/field-test-kits-for-collection-of-ignitable-liquids-and-ignitable-liquid-residues-used-by-the-nsw-fire-scene-investigators
#8
Katarina Burda, Margaret Black, Suzanna Djulamerovic, Kathleen Darwen, Kathryn Hollier
The detection of ignitable liquid residues (ILR) on samples related to fire scenes provides investigators with important information. Field test kits were developed as an alternative procedure to swabbing using cotton wool and cotton tip applicators for situations where direct sampling is not possible. Central to the kits is a piece of white absorbent non-woven material consisting of polypropylene fibres (cloth). Experiments were carried out in our laboratory using the polypropylene cloths and cotton wool for collection of burnt and unburnt petrol residues from porous and non-porous surfaces...
July 2016: Forensic Science International
https://www.readbyqxmd.com/read/26884412/spontaneous-cholelithiasis-in-a-squirrel-monkey-saimiri-sciureus
#9
Mia T Lieberman, Lynn M Wachtman, Robert P Marini, Vasu Bakthavatchalu, James G Fox
A mature female squirrel monkey was noted during routine semiannual examinations to have moderate progressive weight loss. Serum chemistry panels revealed marked increases in hepatic enzyme, bilirubin, and bile salt concentrations and hypoalbuminemia. Abdominal ultrasonography revealed echogenic, shadowing debris in the gallbladder, consistent with cholelithiasis. At necropsy, marked thickening and distension of the gallbladder, cystic duct, and common bile duct was noted, and more than 50 irregularly shaped, black gallstones were removed from the biliary tract...
February 2016: Comparative Medicine
https://www.readbyqxmd.com/read/26803634/toll-like-receptor-dependent-immune-complex-activation-of-b-cells-and-dendritic-cells
#10
Krishna L Moody, Melissa B Uccellini, Ana M Avalos, Ann Marshak-Rothstein, Gregory A Viglianti
High titers of autoantibodies reactive with DNA/RNA molecular complexes are characteristic of autoimmune disorders such as systemic lupus erythematosus (SLE). In vitro and in vivo studies have implicated the endosomal Toll-like receptor 9 (TLR9) and Toll-like receptor 7 (TLR7) in the activation of the corresponding autoantibody producing B cells. Importantly, TLR9/TLR7-deficiency results in the inability of autoreactive B cells to proliferate in response to DNA/RNA-associated autoantigens in vitro, and in marked changes in the autoantibody repertoire of autoimmune-prone mice...
2016: Methods in Molecular Biology
https://www.readbyqxmd.com/read/26551095/does-the-collapse-of-a-supramassive-neutron-star-leave-a-debris-disk
#11
Ben Margalit, Brian D Metzger, Andrei M Beloborodov
One possible channel for black hole formation is the collapse of a rigidly rotating massive neutron star as it loses its angular momentum or gains excessive mass through accretion. It was proposed that part of the neutron star may form a debris disk around the black hole. Such short-lived massive disks could be the sources of powerful jets emitting cosmological gamma-ray bursts. Whether the collapse creates a disk depends on the equation of state of the neutron star. We survey a wide range of equations of states allowed by observations and find that disk formation is unfeasible...
October 23, 2015: Physical Review Letters
https://www.readbyqxmd.com/read/26509818/exploration-of-the-canyon-incised-continental-margin-of-the-northeastern-united-states-reveals-dynamic-habitats-and-diverse-communities
#12
Andrea M Quattrini, Martha S Nizinski, Jason D Chaytor, Amanda W J Demopoulos, E Brendan Roark, Scott C France, Jon A Moore, Taylor Heyl, Peter J Auster, Brian Kinlan, Carolyn Ruppel, Kelley P Elliott, Brian R C Kennedy, Elizabeth Lobecker, Adam Skarke, Timothy M Shank
The continental margin off the northeastern United States (NEUS) contains numerous, topographically complex features that increase habitat heterogeneity across the region. However, the majority of these rugged features have never been surveyed, particularly using direct observations. During summer 2013, 31 Remotely-Operated Vehicle (ROV) dives were conducted from 494 to 3271 m depth across a variety of seafloor features to document communities and to infer geological processes that produced such features. The ROV surveyed six broad-scale habitat features, consisting of shelf-breaching canyons, slope-sourced canyons, inter-canyon areas, open-slope/landslide-scar areas, hydrocarbon seeps, and Mytilus Seamount...
2015: PloS One
https://www.readbyqxmd.com/read/26241891/contact-damage-failure-analyses-of-fretting-wear-behavior-of-the-metal-stem-titanium-alloy-bone-cement-interface
#13
Lanfeng Zhang, Shirong Ge, Hongtao Liu, Qingliang Wang, Liping Wang, Cory J Xian
Although cemented titanium alloy is not favored currently in the Western world for its poor clinical and radiography outcomes, its lower modulus of elasticity and good biocompatibility are instrumental for its ability supporting and transforming physical load, and it is more suitable for usage in Chinese and Japanese populations due to their lower body weights and unique femoral characteristics. Through various friction tests of different cycles, loads and conditions and by examining fretting hysteresis loops, fatigue process curves and wear surfaces, the current study investigated fretting wear characteristics and wear mechanism of titanium alloy stem-bone cement interface...
November 2015: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/26229860/pelvic-pseudotumor-following-total-hip-arthroplasty-case-report
#14
Nelson Franco Filho, Alexandre de Paiva Luciano, Bruno Vierno
Loosening is a well-known complication of total hip arthroplasty. The accumulation of detritus resulting from mechanical wear forms inflammatory cells that have the function of phagocytizing this debris. Over the long term, these cells may give rise to a local granulomatous reaction. Here, we present a report on a case of pelvic pseudotumor subsequent to total hip arthroplasty, which is considered rare in the literature. The patient was a 48-year-old black man who started to be followed up medically eight months earlier because of uncharacteristic abdominal pains, dysuria and pollakiuria...
September 2014: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/26197116/ultrahigh-energy-debris-from-the-collisional-penrose-process
#15
Emanuele Berti, Richard Brito, Vitor Cardoso
Soon after the discovery of the Kerr metric, Penrose realized that superradiance can be exploited to extract energy from black holes. The original idea (involving the breakup of a single particle) yields only modest energy gains. A variant of the Penrose process consists of particle collisions in the ergoregion. The collisional Penrose process has been explored recently in the context of dark matter searches, with the conclusion that the ratio η between the energy of postcollision particles detected at infinity and the energy of the colliding particles should be modest (η≲1...
June 26, 2015: Physical Review Letters
https://www.readbyqxmd.com/read/26169386/respiratory-pathology-and-pathogens-in-wild-urban-rats-rattus-norvegicus-and-rattus-rattus
#16
J L Rothenburger, C G Himsworth, C B Clifford, J Ellis, P M Treuting, F A Leighton
Norway (Rattus norvegicus) and black rats (Rattus rattus) are common peridomestic species, yet little is known about wild rat ecology, including their natural diseases. We describe gross and histological lesions in the respiratory tract of a sample of 711 wild urban rats. A subset was examined for 19 distinct categories of histological lesions in the respiratory tract. Testing for known respiratory pathogens included serology and polymerase chain reaction (PCR) of lung samples. Grossly evident lesions were rare (8/711; 1%)...
November 2015: Veterinary Pathology
https://www.readbyqxmd.com/read/26065563/a-possible-macronova-in-the-late-afterglow-of-the-long-short-burst-grb-060614
#17
Bin Yang, Zhi-Ping Jin, Xiang Li, Stefano Covino, Xian-Zhong Zheng, Kenta Hotokezaka, Yi-Zhong Fan, Tsvi Piran, Da-Ming Wei
Long-duration (>2 s) γ-ray bursts that are believed to originate from the death of massive stars are expected to be accompanied by supernovae. GRB 060614, that lasted 102 s, lacks a supernova-like emission down to very stringent limits and its physical origin is still debated. Here we report the discovery of near-infrared bump that is significantly above the regular decaying afterglow. This red bump is inconsistent with even the weakest known supernova. However, it can arise from a Li-Paczyński macronova--the radioactive decay of debris following a compact binary merger...
2015: Nature Communications
https://www.readbyqxmd.com/read/26045198/plastic-and-metal-ingestion-in-three-species-of-coastal-waterfowl-wintering-in-atlantic-canada
#18
Matthew D English, Gregory J Robertson, Stephanie Avery-Gomm, Donald Pirie-Hay, Sheena Roul, Pierre C Ryan, Sabina I Wilhelm, Mark L Mallory
Relatively little attention has been paid to the occurrence of anthropogenic debris found in coastal species, especially waterfowl. We examined the incidence of ingested plastic and metal in three waterfowl species wintering in Atlantic Canada: American black ducks (Anas rubripes) and mallards (A. platyrhynchos), two species that use marine and freshwater coastal habitats for foraging in the winter, and common eider (Somateria mollissima), a coastal marine species that feeds on intertidal and subtidal benthic organisms...
September 15, 2015: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/26037817/perfluoroalkyl-sulfonates-and-carboxylic-acids-in-liver-muscle-and-adipose-tissues-of-black-footed-albatross-phoebastria-nigripes-from-midway-island-north-pacific-ocean
#19
Shaogang Chu, Jun Wang, Gladys Leong, Lee Ann Woodward, Robert J Letcher, Qing X Li
The Great Pacific Garbage Patch (GPGP) is a gyre of marine plastic debris in the North Pacific Ocean, and nearby is Midway Atoll which is a focal point for ecological damage. This study investigated 13 C4-C16 perfluorinated carboxylic acids (PFCAs), four (C4, C6, C8 and C10) perfluorinated sulfonates and perfluoro-4-ethylcyclohexane sulfonate [collectively perfluoroalkyl acids (PFAAs)] in black-footed albatross tissues (collected in 2011) from Midway Atoll. Of the 18 PFCAs and PFSAs monitored, most were detectable in the liver, muscle and adipose tissues...
November 2015: Chemosphere
https://www.readbyqxmd.com/read/25919416/simultaneous-chromate-reduction-and-azo-dye-decolourization-by-lactobacillus-paracase-cl1107-isolated-from-deep-sea-sediment
#20
Guangdao Huang, Wei Wang, Guoguang Liu
Lactobacillus paracase CL1107 capable of removing toxic chromium (Cr(VI)) and Acid Black (ATT) azo dye simultaneously was isolated from deep sea sediment of the North Atlantic. CL1107 exhibited appreciable dye-Cr(VI) bioremoval ability in the pH range from 5 to 7, temperature 25-35 °C and NaCl 0-6% under aerobic conditions. The maximum removal values of Cr(VI) (95.8%) and dye (92.3%) were obtained in the media including only Cr(VI) or dye at initial concentration of 100 mg/L. In the experiments for the simultaneous treatment of both pollutants, the reduction of Cr(VI) and dye was 58...
July 1, 2015: Journal of Environmental Management
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