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https://www.readbyqxmd.com/read/29374379/effects-of-dissolved-organic-matter-leaching-from-macrophyte-litter-on-black-water-events-in-shallow-lakes
#1
Yuhong He, Na Song, He-Long Jiang
In recent years, the black water phenomenon has become an environmental event in eutrophic shallow lakes in China, leading to deterioration of lake ecosystems and potable water crises. Decomposition of macrophyte debris has been verified as a key inducement for black water events. In this study, the effects of the decomposition of dissolved organic matter (Kottelat et al., WASP 187:343-351, 2008) derived from macrophyte leachate on the occurrence of black water events are investigated to clarify the detailed mechanisms involved...
January 26, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29342012/diffuse-chorioretinopathy-without-serous-detachment-associated-with-cardiac-transplantation
#2
Michael F Marmor
PURPOSE: To analyze an unusual case of widespread chorioretinopathy after cardiac transplantation for its potential etiology and clinical significance. METHODS: Clinical examinations included widefield and macular color and fundus autofluorescence photography, spectral domain optical coherence tomography, fluorescein angiography and indocyanine green angiography, full-field electroretinography, and Goldmann visual fields. PATIENT: A 44-year-old Hispanic woman was referred to rule out retinitis pigmentosa...
January 16, 2018: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/29282493/plastic-and-non-plastic-debris-ingestion-in-three-gull-species-feeding-in-an-urban-landfill-environment
#3
S Seif, J F Provencher, S Avery-Gomm, P-Y Daoust, M L Mallory, P A Smith
Plastic debris is recognized as a widespread, common and problematic environmental pollutant. An important consequence of this pollution is the ingestion of plastic debris by wildlife. Assessing the degree to which different species ingest plastics, and the potential effects of these plastics on their health are important research needs for understanding the impacts of plastic pollution. We examined debris (plastic and other types) ingestion in three sympatric overwintering gull species (Herring gulls Larus smithsonianus, Great Black-backed Gulls Larus marinus, and Iceland Gulls Larus glaucoides) to understand how debris ingestion differs among species, age classes and sexes in gulls...
December 27, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29059612/export-of-microplastics-from-land-to-sea-a-modelling-approach
#4
Max Siegfried, Albert A Koelmans, Ellen Besseling, Carolien Kroeze
Quantifying the transport of plastic debris from river to sea is crucial for assessing the risks of plastic debris to human health and the environment. We present a global modelling approach to analyse the composition and quantity of point-source microplastic fluxes from European rivers to the sea. The model accounts for different types and sources of microplastics entering river systems via point sources. We combine information on these sources with information on sewage management and plastic retention during river transport for the largest European rivers...
October 6, 2017: Water Research
https://www.readbyqxmd.com/read/28960848/influence-of-thickness-color-and-polishing-process-of-ethylene-vinyl-acetate-sheets-on-surface-roughness-and-microorganism-adhesion
#5
Mariane Hemerly Almeida, Geovana Ventorim Ceschim, Natalia Lopes Pontes Póvoa Iorio, Helvécio Cardoso Corrêa Póvoa, Marlus Roberto Rodrigues Cajazeira, Glaucio Serra Gumaraes, Leonardo Santos Antunes, Lívia Azeredo Alves Antunes
BACKGROUND/AIM: The surface roughness of dental materials can make cleaning difficult, thus facilitating retention of food debris and accumulation of microorganisms. The aim of this study was to assess whether thickness, color and the polishing process influence the surface roughness of ethylene-vinyl-acetate (EVA) sheets and the amount of microorganisms that adhere to them. MATERIALS AND METHODS: A total of 180 samples of EVA (5x5mm) were divided into nine groups according to thickness (G1 = 2 mm; G2 = 3 mm; and G3 = 4 mm), color (G4 = black and G5 = white) and type of polishing (G6 = Scheu(™) ; G7 = Scheu(™) associated with hot-air burner; G8 = Erkodent(™) and G9 = Erkodent(™) associated with hot-air burner)...
September 28, 2017: Dental Traumatology: Official Publication of International Association for Dental Traumatology
https://www.readbyqxmd.com/read/28956991/persistence-of-trichomonas-gallinae-in-birdseed
#6
Scott McBurney, Whitney K Kelly-Clark, María J Forzán, Raphaël Vanderstichel, Kevin Teather, Spencer J Greenwood
Trichomonas gallinae has emerged worldwide as a cause of mortality in songbirds (passerines). The congregation of numerous birds, including the reservoir hosts, pigeons and doves (columbids), at backyard feeding and watering sources has been suggested as a potential driver for the outbreaks. Evidence supporting a role for water in transmission has been established, but the role of birdseed in the transmission of trichomoniasis remained to be investigated. We assessed the survival of T. gallinae in three commercial birdseeds (mixed seed, black-oil sunflower seed, and niger seed) routinely used to attract passerine birds to local properties...
September 2017: Avian Diseases
https://www.readbyqxmd.com/read/28917819/seabirds-and-marine-plastic-debris-in-the-northeastern-atlantic-a-synthesis-and-recommendations-for-monitoring-and-research
#7
REVIEW
Nina J O'Hanlon, Neil A James, Elizabeth A Masden, Alexander L Bond
Marine plastic pollution is an increasing, and global, environmental issue. Numerous marine species are affected by plastic debris through entanglement, nest incorporation, and ingestion, which can lead to lethal and sub-lethal impacts. However, in the northeastern Atlantic Ocean, an area of international importance for seabirds, there has been little effort to date to assess information from studies of wildlife and plastic to better understand the spatiotemporal variation of how marine plastic affects different seabird species...
December 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28841358/the-dual-defensive-strategy-of-amorphophallus-throughout-its-ontogeny
#8
Kunpeng Liu, Nik Fadzly, Asyraf Mansor, Rahmad Zakaria, Nadine Ruppert, Chow Yang Lee
Amorphophallus bufo is a rarely studied plant in Malaysian tropical rainforests. We measured the spectral reflectance of different developmental stages of A. bufo (seedlings, juveniles and adults), background soil/ debris and leaves from other neighboring plant species. Results show that the leaves of A. bufo seedling have a similar reflectance curve as the background soil and debris. Adults and juveniles of A. bufo are similar to other neighboring plants' leaf colors. We hypothesize that the cryptic coloration of A...
October 3, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28707239/microplastic-pollution-in-deposited-urban-dust-tehran-metropolis-iran
#9
Sharareh Dehghani, Farid Moore, Razegheh Akhbarizadeh
Environmental pollutants such as microplastics have become a major concern over the last few decades. We investigated the presence, characteristics, and potential health risks of microplastic dust ingestion. The plastic load of 88 to 605 microplastics per 30 g dry dust with a dominance of black and yellow granule microplastics ranging in size from 250 to 500 μm was determined in 10 street dust samples using a binocular microscope. Fluorescence microscopy was found to be ineffective for detecting and counting plastic debris...
September 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28665769/lack-of-evidence-for-microplastic-contamination-in-honey
#10
Peter Mühlschlegel, Armin Hauk, Ulrich Walter, Robert Sieber
Honey samples from Switzerland were investigated with regard to their microplastic particle burden. Five representative honey samples of different origin were processed following a standardized protocol to separate plastic-based microparticles from particles of natural origin, such as pollen, propolis, wax, and bee-related debris. The procedure was optimized to minimize post-sampling microplastic cross-contamination in the laboratory. The isolated microplastic particles were characterized and grouped by means of light microscopy as well as chemically characterized by microscopically coupled Raman and Fourier transform infrared spectroscopy...
November 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28651457/metallosis-in-a-dog-as-a-long-term-complication-following-total-hip-arthroplasty
#11
Mallory J DiVincenzo, Galit H Frydman, Michael P Kowaleski, Charles R Vanderburg, Barry Lai, Trisha J Oura, Samuel H Jennings
Metallosis is the accumulation of metallic debris in soft tissues resulting from wear following total joint replacement. A dog was evaluated for lameness 4 years after total hip arthroplasty using a titanium alloy and cobalt chromium total hip system. Radiographs revealed severe acetabular component wear, implant-bone interface deterioration, and peri-acetabular osteolysis. During surgical revision, black periarticular tissue surrounded the implants. Histologically, there was fibrosis and granulomatous inflammation with abundant, intra- and extracellular, black, granular material and smaller amounts of clear punctate to acicular material...
January 1, 2017: Veterinary Pathology
https://www.readbyqxmd.com/read/28610400/shammah-smokeless-tobacco-and-public-health
#12
Abdulsallam Bakdash
Shammah is a preparation of smokeless tobacco (ST) that is frequently used in the Arabian Peninsula, especially in Saudi Arabia. A mixture of powdered tobacco, lime, ash, black pepper, oils and flavorings, shammah in is placed in the buccal cavity or lower labial vestibule of the mouth. The user (or dipper) spits out insoluble debris. ST is linked to a number of harmful effects such as dental disease, oral cancer, oesophagus cancer, and pancreas cancer. It also causes adverse reproductive effects including stillbirth, premature birth and low birth weight...
May 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28314627/n-%C3%AE%C2%B5-carboxymethyl-lysine-concentration-in-debris-from-carotid-artery-stenting-correlates-independently-with-signal-intensity-on-t1-weighted-black-blood-magnetic-resonance-images
#13
Ayumu Eto, Noriyuki Sakata, Ryoji Nagai, Jun-Ichi Shirakawa, Ritsurou Inoue, Fumiaki Kiyomi, Kouhei Nii, Hiroshi Aikawa, Minoru Iko, Masanori Tsutsumi, Kimiya Sakamoto, Fumihiro Hiraoka, Takahumi Mitsutake, Hayatsura Hanada, Kiyoshi Kazekawa
BACKGROUND AND PURPOSE: Because magnetic resonance imaging (MRI) focuses on the morphological characteristics of carotid artery plaques, its diagnostic value with respect to plaque vulnerability is limited. We examined the correlation between N(ε)-(carboxymethyl)lysine (CML), a main chemical structure of advanced glycation end-products, and the vulnerability of plaques visualized on MRI scans. MATERIALS AND METHODS: We enrolled 43 patients who had undergone carotid artery stenting (CAS) for carotid artery stenosis; all underwent MRI studies, including black-blood MRI and diffusion-weighted imaging (DWI)...
March 14, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28069276/levels-of-ingested-debris-vary-across-species-in-canadian-arctic-seabirds
#14
COMPARATIVE STUDY
Florence E Poon, Jennifer F Provencher, Mark L Mallory, Birgit M Braune, Paul A Smith
Plastic debris has become a major pollutant in the world's oceans and is found in many seabird species from low to high latitudes. Here we compare levels of plastic ingestion from two surface feeders, northern fulmars (Fulmarus glacialis) and black-legged kittiwakes (Rissa tridactyla), and two pursuit diving species, thick-billed murres (Uria lomvia) and black guillemots (Cepphus grylle) in the Canadian high Arctic. This is the first report quantifying plastic ingestion in kittiwakes in this region, and as predicted, kittiwakes and fulmars had higher frequency of plastic ingestion than guillemots and murres...
March 15, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/27842715/characterization-of-microplastic-and-mesoplastic-debris-in-sediments-from-kamilo-beach-and-kahuku-beach-hawai-i
#15
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...
December 15, 2016: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/27767188/detection-of-gravitational-wave-emission-by-supermassive-black-hole-binaries-through-tidal-disruption-flares
#16
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
#17
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
#18
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...
November 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
#19
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
#20
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
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