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https://www.readbyqxmd.com/read/28936362/albumin-protein-cleavage-affects-the-wear-and-friction-of-ultra-high-molecular-weight-polyethylene
#1
Yasha Dwivedi, Michel P Laurent, Shravan Sarvepalli, Thomas M Schmid, Markus A Wimmer
It is well established that the total protein concentration and albumin-to-globulin ratio influence the wear of ultra-high molecular polyethylene (UHMWPE, "polyethylene") in joint prostheses. A factor on wear not yet studied, but of possible clinical relevance, is protein cleavage. Such cleavage is expected in the presence of an inflammatory response and as a result of wear processes at the articular interface. The aim of this study was to compare the tribological behavior of polyethylene articulated against an orthopedic wrought CoCrMo alloy for three lubricants: cleaved albumin, uncleaved albumin, and newborn calf serum (control)...
September 2017: Lubricants
https://www.readbyqxmd.com/read/28936288/a-comparative-evaluation-of-smear-layer-removal-using-apical-negative-pressure-endovac-sonic-irrigation-endoactivator-and-er-yag-laser-an-in-vitro-sem-study
#2
Sanghamitra Suman, Promila Verma, Aseem Prakash-Tikku, Rhythm Bains, Vijay Kumar-Shakya
BACKGROUND: This study aimed to compare the smear layer removing efficacy of the EndoActivator, EndoVac and Er:YAG laser in extracted mandibular premolars, at the apical, middle and coronal third of root canal, through scanning electron microscopy. MATERIAL AND METHODS: 40 extracted mandibular premolars were decoronated to a standardized length of 12 mm. Specimens were shaped to ProTaper F4 size and irrigated with 5.25% sodium hypochlorite at 370C between instrumentation...
August 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28935376/reducing-single-use-plastic-shopping-bags-in-the-usa
#3
Travis P Wagner
In the USA, local governments have the primary responsibility to manage MSW. However, local governments lack the authority to explicitly shift costs or responsibility back onto the producer for specific problem wastes. A particularly problematic waste for local governments is the single-use plastic bag. In 2014, in the USA, 103.465 billion single-use plastic shopping bags were consumed. Because of their extremely low recyclability rate, plastic bags remain a significant source of land-based litter and marine debris and impair stormwater management systems...
September 18, 2017: Waste Management
https://www.readbyqxmd.com/read/28934331/direct-identification-of-microorganisms-from-thioglycolate-broth-by-maldi-tof-ms
#4
Jorge Arca-Suárez, Fátima Galán-Sánchez, Pilar Marin-Casanova, Manuel A Rodríguez-Iglesias
We developed an easy MALDI-TOF MS-based assay to identify microorganisms directly from thioglycolate broth. A total of 101 positive thioglycolate broths inoculated with 15 different kinds of samples were evaluated. In 91 samples (90.1%), direct MALDI-TOF MS identifications were the same as those obtained after conventional laboratory procedures including subcultures. In 10 samples misidentified by direct processing, yeasts or mixed cultures grew in the thioglycolate subcultures, or high cellular debris hampered a correct analysis...
2017: PloS One
https://www.readbyqxmd.com/read/28932188/is-there-evidence-for-myelin-modeling-by-astrocytes-in-the-normal-adult-brain
#5
Alfredo Varela-Echevarría, Víctor Vargas-Barroso, Carlos Lozano-Flores, Jorge Larriva-Sahd
A set of astrocytic process associated with altered myelinated axons is described in the forebrain of normal adult rodents with confocal, electron microscopy, and 3D reconstructions. Each process consists of a protuberance that contains secretory organelles including numerous lysosomes which polarize and open next to disrupted myelinated axons. Because of the distinctive asymmetric organelle distribution and ubiquity throughout the forebrain neuropil, this enlargement is named paraxial process (PAP). The myelin envelope contiguous to the PAP displays focal disruption or disintegration...
2017: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/28931340/lessons-learnt-from-early-failure-of-a-patient-trial-with-a-polymer-on-polymer-resurfacing-hip-arthroplasty
#6
Job L C Van Susante, Nico Verdonschot, L Paul A Bom, Pawel Tomaszewski, Pat Campbell, Edward Ebramzadeh, B Wim Schreurs
Background and purpose - Hip resurfacing (HR) is a treatment option promoted for hip arthritis in young and active patients. However, adverse reactions to metal are a concern and the search for non-metallic bearing options proceeds. We present the first clinical study performed in patients using a newly developed hydrophilic polymer-on-polymer hip resurfacing device. Patients and methods - After performing extensive hip simulator tests, biocompatibility testing and animal tests (ISO 14242-1,3; 10993-3,4,5,10,11), approval was obtained from the IRB committee to enroll 15 patients in the first clinical study in humans using this experimental polymer-on-polymer hip resurfacing device...
September 21, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28929383/evaluation-of-the-impact-of-six-different-dna-extraction-methods-for-the-representation-of-the-microbial-community-associated-with-human-chronic-wound-infections-using-a-gel-based-dna-profiling-method
#7
Ayomi Dilhari, Asanga Sampath, Chinthika Gunasekara, Neluka Fernando, Deepaka Weerasekara, Chris Sissons, Andrew McBain, Manjula Weerasekera
Infected chronic wounds are polymicrobial in nature which include a diverse group of aerobic and anaerobic microorganisms. Majority of these communal microorganisms are difficult to grow in vitro. DNA fingerprinting methods such as polymerase chain reaction-denaturation gradient gel electrophoresis (PCR-DGGE) facilitate the microbial profiling of complex ecosystems including infected chronic wounds. Six different DNA extraction methods were compared for profiling of the microbial community associated with chronic wound infections using PCR-DGGE...
September 19, 2017: AMB Express
https://www.readbyqxmd.com/read/28929003/fatal-cobalt-toxicity-after-a-non-metal-on-metal-total-hip-arthroplasty
#8
Rinne M Peters, Pax Willemse, Paul C Rijk, Mels Hoogendoorn, Wierd P Zijlstra
This case illustrates the potential for systemic cobalt toxicity in non-metal-on-metal bearings and its potentially devastating consequences. We present a 71-year-old male with grinding sensations in his right hip following ceramic-on-ceramic total hip arthroplasty (THA). After diagnosing a fractured ceramic liner, the hip prosthesis was revised into a metal-on-polyethylene bearing. At one year postoperatively, X-rays and MARS-MRI showed a fixed reversed hybrid THA, with periarticular densities, flattening of the femoral head component, and a pattern of periarticular metal wear debris and pseudotumor formation...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28928591/accidental-perforation-of-submental-flexometallic-tube
#9
Subbulakshmi Sundaram, Gowthaman Ramdas, Anisha Pauline Paul, Sekaran Natesan Krishnasamy
Oral and maxillofacial surgeries associated with complications due to endotracheal tube (ETT) damage are being reported in literature increasingly. In this case, we report a rare case of accidental perforation of a flexometallic ETT intraoperatively during an orthognathic corrective surgery, in a 19-year-old female patient in whom submental intubation had been performed. The complication was managed conservatively as the tissue debris created during the osteotomy drilling occluded the damage and caused a good seal of the damage, with minimal leak, and no airway compromise...
July 2017: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/28926394/armd-and-presumed-dangerous-commentary-on-an-article-by-gulraj-s-matharu-bsc-hons-mrcs-mres-et-al-blood-metal-ion-thresholds-to-identify-patients-with-metal-on-metal-hip-implants-at-risk-of-adverse-reactions-to-metal-debris-an-external-multicenter-validation
#10
COMMENT
https://www.readbyqxmd.com/read/28926383/mri-findings-in-patients-after-small-head-metal-on-metal-total-hip-arthroplasty-with-a-minimum-follow-up-of-10-years
#11
Tobias Reiner, Thuy D Do, Matthias C Klot, Fabian Hertzsch, Kirsten Seelmann, Matthias M Gaida, Marc-André Weber, Tobias Gotterbarm
BACKGROUND: Concern has been raised about the late onset of adverse reactions to metal debris (ARMD) in patients with a small-head metal-on-metal total hip replacement. The aims of this study were to assess the frequency and characteristic appearance of ARMD in patients with a small-head (28-mm) metal-on-metal total hip replacement and elevated blood ion levels (>1 μg/L) after a minimum follow-up of 10 years and to analyze the possible risk factors associated with the prevalence of these lesions...
September 20, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28926382/blood-metal-ion-thresholds-to-identify-patients-with-metal-on-metal-hip-implants-at-risk-of-adverse-reactions-to-metal-debris-an-external-multicenter-validation-study-of-birmingham-hip-resurfacing-and-corail-pinnacle-implants
#12
MULTICENTER STUDY
Gulraj S Matharu, Fiona Berryman, Andrew Judge, Aleksi Reito, Jamie McConnell, Olli Lainiala, Stephen Young, Antti Eskelinen, Hemant G Pandit, David W Murray
BACKGROUND: The authors of recent studies have reported newly devised implant-specific blood metal ion thresholds to predict adverse reactions to metal debris (ARMD) in patients who have undergone unilateral or bilateral metal-on-metal (MoM) hip arthroplasty. These thresholds were most effective for identifying patients at low risk of ARMD. We investigated whether these newly devised blood metal ion thresholds could effectively identify patients at risk of ARMD after MoM hip arthroplasty in an external cohort of patients...
September 20, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28925594/pharyngoesophageal-diverticula-simulating-thyroid-nodules-an-unusual-occurrence-with-unique-features
#13
Karen K Nauschuetz, Lorna L Ogden, Cherry E Starling, Mohammad J Saleh, Allan C Golding, S Thomas Traweek
Pharyngoesophageal diverticula (PED) of the Zenker's and Killian-Jamieson types arise in close proximity to the thyroid gland, and may rarely be confused with a thyroid nodule on ultrasonography. In this brief report, we detail the cytologic, clinical, and radiologic findings of three PED that were thought to be thyroid nodules, and were subjected to fine-needle aspiration (FNA). The patients were females with an age range of 51-64 years. All three patients had multiple thyroid nodules, and two patients reported symptoms attributable to the diverticulum...
September 19, 2017: Diagnostic Cytopathology
https://www.readbyqxmd.com/read/28924588/endoscopic-pancreatic-necrosectomy-why-scuff-when-you-can-flush-the-muck-make-it-an-easy-row-to-hoe
#14
Rinkesh Kumar Bansal, Rajesh Puri, Narendra S Choudhary, Sumit Bhatia, Nisharg Patel, Saurabh K Patle, Gaurav K Patil, Amit Agarwal, Chandra Prabha, Randhir Sud
BACKGROUND AND AIMS:  Endoscopic ultrasound (EUS) guided drainage of symptomatic pancreatic walled-off necrosis (WON) followed by fully covered self-expanding metal stent (FCSEMS) placement offers several advantages such as higher technical success rate and the option of necrosectomy. The aim of this study was to evaluate the safety and efficacy of EUS guided drainage of patients with WON by using FCSEMS and intracavitary lavage with a solution containing hydrogen peroxide and adopting a step-up approach...
September 2017: Endoscopy International Open
https://www.readbyqxmd.com/read/28918982/characteristics-of-meso-sized-plastic-marine-debris-on-20-beaches-in-korea
#15
Jongsu Lee, Jongmyoung Lee, Sunwook Hong, Sang Hee Hong, Won Joon Shim, Soeun Eo
We surveyed the abundance and accumulation patterns of mesoplastic marine debris (5-25mm) on 20 beaches in Korea. The mean abundance of it was 13.2items/m(2), and the mean weight was 1.5g/m(2). Hard plastic and Styrofoam were the dominant types. The proportions of hard plastic and Styrofoam were highly variable among the beaches, each accounting for 0-100% of the total debris on a given beach with 32% and 48.5% (by number) on average, respectively. Relatively lower abundances of mesoplastic marine debris compared with our previous studies were likely due by differences of the sampling areas within the beach...
September 14, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28918553/characteristic-of-microplastics-in-the-atmospheric-fallout-from-dongguan-city-china-preliminary-research-and-first-evidence
#16
Liqi Cai, Jundong Wang, Jinping Peng, Zhi Tan, Zhiwei Zhan, Xiangling Tan, Qiuqiang Chen
Microplastic pollution has exhibited a global distribution, including seas, lakes, rivers, and terrestrial environment in recent years. However, little attention was paid on the atmospheric environment, though the fact that plastic debris can escape as wind-blown debris was previously reported. Thus, characteristics of microplastics in the atmospheric fallout from Dongguan city were preliminarily studied. Microplastics of three different polymers, i.e., PE, PP, and PS, were identified. Diverse shapes of microplastics including fiber, foam, fragment, and film were found, and fiber was the dominant shape of the microplastics...
September 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28917819/seabirds-and-marine-plastic-debris-in-the-northeastern-atlantic-a-synthesis-and-recommendations-for-monitoring-and-research
#17
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...
September 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28917431/results-of-toccata-%C3%A2-resurfacing-pip-joint-arthroplasty-a-series-of-32%C3%A2-cases-at-a-mean-follow-up-of-5-9%C3%A2-years
#18
W Kim, B Renaud, P Dumontier, J-L Condamine
The objective of this study was to evaluate the long-term results of proximal interphalangeal (PIP) resurfacing arthroplasty for treating osteoarthritis: the PIP Toccata implant(®). This was a retrospective study of 32 out of 33 PIP arthroplasty cases performed with a dorsolateral or a Chamay approach by two surgeons after a minimum follow-up of 24 months. Patients were reviewed using a standardized assessment of pain, function, mobility and radiological changes. The average follow-up was 5.9 years. The mean active range of motion was 67° (15-95)...
September 13, 2017: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/28917414/chemical-and-physical-analysis-of-phaco-handpiece-tip-surfaces-before-and-after-cataract%C3%A2-surgery
#19
Paolo Cecchini, Rossella D'Aloisio, Manlio Antonuccio, Gianluca Turco, Federica Bondino, Elena Magnano, Marta Di Nicola, Daniele Tognetto
PURPOSE: To evaluate the surface chemical composition and roughness of different phaco tips before and after their use during cataract surgery. SETTING: Eye Clinic, University of Trieste, Trieste, Italy. DESIGN: Experimental study. METHODS: Of the 66 tips studied, 33 (15 new, 15 after single use, and 3 after multiple uses) were studied with X-ray photoemission spectroscopy and 33 (15 new, 15 after single use, and 3 after multiple uses) were examined using scanning electron microscopy with energy dispersive X-ray spectroscopy analysis and contact profilometry...
August 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28917168/occurrence-and-distribution-of-microplastics-at-selected-coastal-sites-along-the-southeastern-united-states
#20
Xubiao Yu, Samantha Ladewig, Shaowu Bao, Catherine A Toline, Stefanie Whitmire, Alex T Chow
To investigate the occurrence and distribution of microplastics in the southeastern coastal region of the United States, we quantified the amount of microplastics in sand samples from multiple coastal sites and developed a predictive model to understand the drift of plastics via ocean currents. Sand samples from eighteen National Park Service (NPS) beaches in the Southeastern Region were collected and microplastics were isolated from each sample. Microplastic counts were compared among sites and local geography was used to make inferences about sources and modes of distribution...
September 13, 2017: Science of the Total Environment
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