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https://www.readbyqxmd.com/read/27906096/biological-and-functional-evaluation-of-a-novel-pyrolytic-carbon-implant-for-the-treatment-of-focal-osteochondral-defects-in-the-medial-femoral-condyle-assessment-in-a-canine-model
#1
Samantha L Salkeld, Laura P Patron, Joan C Lien, Stephen D Cook, Deryk G Jones
BACKGROUND: Osteochondral defects continue to be a clinical treatment challenge, and when left untreated, may cause pain and functional impairment. Pyrolytic carbon is a unique isotropic biomaterial used in heart valve and small joint replacements due to its excellent wear properties and biocompatibility with bone and articular cartilage. Therefore, a proposed solution is to utilize a focal pyrolytic carbon hemiarthroplasty implant as an alternative resurfacing treatment strategy for isolated cartilage lesions...
December 1, 2016: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/27901646/the-time-dependent-health-and-biochemical-effects-in-rats-exposed-to-stainless-steel-welding-dust-and-its-soluble-form
#2
Tadeusz Halatek, Magdalena Stanislawska, Irena Kaminska, Malgorzata Cieslak, Radoslaw Swiercz, Wojciech Wasowicz
Welding processes that generate fumes containing toxic metals, such as hexavalent chromium (Cr(VI)), manganese (Mn), and nickel (Ni), have been implicated in lung injury, inflammation, and lung tumor promotion in animal models. The principal objective of this study was to determine the dynamics of toxic effects of inhalation exposure to morphologically rated welding dust from stainless steel welding and its soluble form in TSE System with a dynamic airflow. We assessed the pulmonary toxicity of welding dust in Wistar rats exposed to 60...
November 30, 2016: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/27898860/effects-of-collection-time-on-flow-of-chromium-and-dry-matter-and-on-basal-ileal-endogenous-losses-of-amino-acids-in-growing-pigs
#3
B G Kim, Y Liu, H H Stein
The objectives of this experiment were to examine the diurnal patterns of chromium and DM flow at the distal ileum of pigs and to determine the effect of collection time on basal ileal endogenous losses (BEL) of CP and AA. Eight barrows with an initial BW of 34.6kg (SD = 2.1) were individually fitted with a T-cannula in the distal ileum and randomly allotted to a replicated 4× 4 Latin square design with 4 diets and 4 periods in each square. Three diets contained either corn, soybean meal, or distillers dried grains with solubles as the sole source of CP and AA...
October 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27898307/a-ca-2-chelator-ameliorates-chromium-vi-induced-hepatocyte-l-02-injury-via-down-regulation-of-voltage-dependent-anion-channel-1-vdac1-expression
#4
Xing Yi, Fang Xiao, Xiali Zhong, Yujie Duan, Kaihua Liu, Caigao Zhong
Hexavalent chromium could result in cell malfunctions. Intracellular Ca(2+) ([Ca(2+)]i) content and VDAC1 expression are both important features related to cell survial. This study aimed to explore the mechanism of cell injury induced by Cr(VI) and tentatively offer clues to repairing this cell damage using [Ca(2+)]i and VDAC1. L-02 hepatocytes were treated with Cr(VI)/BAPTA, and the levels of [Ca(2+)]i and cell injury associated with Cr(VI) were determined in addition to the effect of BAPTA. The expression of VDAC1 in Cr(VI)-induced cells was evaluated...
November 18, 2016: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/27894683/biomonitoring-of-humans-exposed-to-arsenic-chromium-nickel-vanadium-and-complex-mixtures-of-metals-by-using-the-micronucleus-test-in-lymphocytes
#5
REVIEW
Balasubramanyam Annangi, Stefano Bonassi, Ricard Marcos, Alba Hernández
Various metals have demonstrated genotoxic and carcinogenic potential via different mechanisms. Until now, biomonitoring and epidemiological studies have been carried out to assess the genotoxic risk to exposed human populations. In this sense, the use of the micronucleus assay in peripheral blood lymphocytes has proven to be a useful tool to determine increased levels of DNA damage, as a surrogate biomarker of cancer risk. Here we review those biomonitoring studies focused on people exposed to arsenic, chromium, nickel, vanadium and complex mixtures of metals...
October 2016: Mutation Research
https://www.readbyqxmd.com/read/27894054/immunolocalization-of-metallothionein-in-hepatocytes-of-guppy-fish-poecilia-reticulata-exposed-to-tannery-effluent-a-biomarker-study
#6
Anulipi Aich, Buddhadeb Chattopadhyay, Subhra Kumar Mukhopadhyay
Composite tannery effluent (TE) contaminated with a load of metals, especially chromium, is used in East Calcutta Wetland Ecosystem (ECW; a Ramsar site of West Bengal; No 1208) after natural stabilization for pisciculture and agriculture. Quantity and synergistic and antagonistic activities of both essential and nonessential metals in the effluents can induce a variety of complex changes in animal physiology. High fish yield and no apparent adverse influence on the fish biosystems thriving under pollutant stress at ECW allowed the practice to thrive sustainably over the last nearly 100 years...
November 25, 2016: Chemosphere
https://www.readbyqxmd.com/read/27891370/trace-elements-in-chronic-haemodialysis-patients-and-healthy-individuals-a-comparative-study
#7
Lokesh Shanmugam, Siva Ranganathan Green, Hemachandar Radhakrishnan, Tony Mathew Kadavanu, Arunkumar Ramachandrappa, Shashank Rakesh Tiwari, Amirtha Lakshmi Rajkumar, Ezhumalai Govindasamy
INTRODUCTION: End Stage Renal Disease (ESRD) patients despite receiving adequate Haemodialysis (HD) develop significant risk of Cardiovascular Disease (CVD). Abnormality in levels of trace elements may potentiate vascular injury by producing sustained inflammation and endothelial dysfunction. Hence, the present study was undertaken to evaluate the levels of trace elements in patients receiving HD. AIM: To study the blood levels of arsenic, cadmium, mercury, lead, chromium, barium, cobalt, caesium and selenium among ESRD patients undergoing HD and compare it with healthy individuals...
October 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27890316/is-there-a-dependence-between-children-s-body-weight-and-the-concentration-of-metals-in-deciduous-teeth
#8
Agnieszka Fischer, Danuta Wiechuła
Malnutrition, manifested by both overweight and underweight, can lead to serious health consequences. The subject of the study was to determine the concentration of elements such as chromium (Cr), calcium (Ca), copper (Cu), iron (Fe) and manganese (Mn) in children's deciduous teeth in relation to their body weight. The calculated body mass index (BMI) values and an application of the growth chart showed that 59% of children among the studied sample had normal weight. In 41% of children, weight disorders were observed including underweight - 28% and overweight - 12%...
September 19, 2016: Homo: Internationale Zeitschrift Für die Vergleichende Forschung Am Menschen
https://www.readbyqxmd.com/read/27888727/studies-of-cadmium-ii-lead-ii-nickel-ii-cobalt-ii-and-chromium-vi-sorption-on-extracellular-polymeric-substances-produced-by-rhodococcus-opacus-and-rhodococcus-rhodochrous
#9
Ryszard Dobrowolski, Aleksandra Szcześ, Magdalena Czemierska, Anna Jarosz-Wikołazka
The adsorption of Cd(II), Pb(II), Ni(II), Co(II) and Cr(VI) ions on the extracellular polymeric substances (EPS) obtained from bacterial strain Rhodococcus opacus and Rhodococcus rhodochrous was investigated by the static sorption method. Influence of pH, time and temperature were studied. It was found that the influence of the pH value and time of adsorption depends on the type of adsorbed ions. For all investigated systems an increase of temperature above 35°C reduces adsorption. However, the static sorption capacities values oscillate around 1...
November 16, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27888451/n-acetyl-l-cysteine-protects-liver-and-kidney-against-chromium-vi-induced-oxidative-stress-in-mice
#10
I İpek Boşgelmez, Gülin Güvendik
Acute hexavalent chromium [Cr(VI)] compound exposure may lead to hepatotoxic and nephrotoxic effects. Cr(VI) reduction may generate reactive intermediates and radicals which might be associated with damage. We investigated effects of N-acetyl-l-cysteine (NAC) pre- or post-treatment on oxidative stress and accumulation of Cr in liver and kidney of Cr(VI)-exposed mice. Intraperitoneal potassium dichromate injection (20 mg Cr/kg) caused a significant elevation of lipid peroxidation in both tissues as compared to control (p < 0...
November 25, 2016: Biological Trace Element Research
https://www.readbyqxmd.com/read/27888450/effects-of-chromium-loaded-chitosan-nanoparticles-on-glucose-transporter-4-relevant-mrna-and-proteins-of-phosphatidylinositol-3-kinase-akt2-kinase-and-amp-activated-protein-kinase-of-skeletal-muscles-in-finishing-pigs
#11
Lujie Liu, Bin Wang, Yudan He, Wenjing Tao, Zixun Liu, Minqi Wang
The study was conducted to evaluate the effects of chromium-loaded chitosan nanoparticles (Cr-CNP) on glucose transporter 4 (GLUT4), relevant messenger RNA (mRNA), and proteins involved in phosphatidylinositol 3-kinase (PI3K), Akt2-kinase, and AMP-activated protein kinase (AMPK) of skeletal muscles in finishing pigs. A total of 120 crossbred barrows (BW 65.00 ± 1.26 kg) were randomly allotted to four dietary treatments, with three pens per treatment and 10 pigs per pen. Pigs were fed the basal diet supplemented with 0, 100, 200, or 400 μg/kg of Cr from Cr-CNP for 35 days...
November 25, 2016: Biological Trace Element Research
https://www.readbyqxmd.com/read/27888329/the-origin-of-hexavalent-chromium-as-a-critical-parameter-for-remediation-of-contaminated-aquifers
#12
Dimitris Dermatas, Iraklis Panagiotakis, Thanasis Mpouras, Kostas Tettas
Two different cases of Cr(VI) contaminated ophiolitic aquifers are presented herein. The first is located at Vergina (Northern Greece), where the maximum Cr(VI) concentration measured was 64 μg/L, being one of the highest geogenic concentrations recorded globally in areas with similar geological background. The second case is located at Inofyta (Central Greece), a makeshift industrial area, where the maximum detected Cr(VI) concentration exceeds 10,000 μg/L, indicating clearly anthropogenic activities as the main source...
November 26, 2016: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/27885396/the-effect-of-liming-and-sewage-sludge-application-on-heavy-metal-speciation-in-soil
#13
Elżbieta Malinowska
The aim of this paper is to assess the effect of liming and low doses of municipal sewage sludge (5%, 10%, 15% of the soil mass) on lead, chromium and nickel speciation in soil. The 420-day experiment was carried out in laboratory conditions. In all the samples lead, chromium and nickel concentration was determined with the ICP-AES method, while the content of those metals in different fractions was measured with the seven-step Zeien and Brümmer method, on the 30th and 420th days of the experiment. Sewage sludge doses significantly diversified lead, chromium and nickel amounts in the soil...
November 24, 2016: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/27885196/stent-recoil-manifesting-as-early-stent-thrombosis-after-ultimaster-thin-strut-cobalt-chromium-sirolimus-eluting-stent-implantation
#14
Akira Sato, Masafumi Ohtani, Hiroaki Watabe, Daiki Akiyama, Tomoya Hoshi, Kazutaka Aonuma
No abstract text is available yet for this article.
November 22, 2016: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/27882493/environmental-status-of-groundwater-affected-by-chromite-ore-processing-residue-copr-dumpsites-during-pre-monsoon-and-monsoon-seasons
#15
Katrin Matern, Harald Weigand, Abhas Singh, Tim Mansfeldt
Chromite ore processing residue (COPR) is generated by the roasting of chromite ores for the extraction of chromium. Leaching of carcinogenic hexavalent chromium (Cr(VI)) from COPR dumpsites and contamination of groundwater is a key environmental risk. The objective of the study was to evaluate Cr(VI) contamination in groundwater in the vicinity of three COPR disposal sites in Uttar Pradesh, India, in the pre-monsoon and monsoon seasons. Groundwater samples (n = 57 pre-monsoon, n = 70 monsoon) were taken in 2014 and analyzed for Cr(VI) and relevant hydrochemical parameters...
November 23, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27882324/studies-on-the-ecological-adaptability-of-growing-rice-with-floating-bed-on-the-dilute-biogas-slurry
#16
Qun Kang, Rui Li, Qi Du, Bowen Cheng, Zhiqi Liao, Chengcheng Sun, Zhaohua Li
This study aimed to explore the ecological adaptability and the possibility of growing rice with floating bed on the dilute biogas slurry. The results of the experiments show that the growth stage, rice plant height, and rice yield and quality were significantly affected by multiple dilutions; rice plants cultivated with 45 multiple dilutions had better ecological adaptability than others. In the 45 multiple dilutions' group, the yield of rice was 13.3 g/bucket (8 rice plants), milled rice rate was 63.1%, and the content of crude protein in the rice was 6...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27881331/in%C3%A2-vitro-assessment-of-retention-and-resistance-failure-loads-of-two-preparation-designs-for-maxillary-anterior-teeth
#17
Aimilia Bintivanou, Argirios Pissiotis, Konstantinos Michalakis
STATEMENT OF PROBLEM: Parallel labiolingual walls and the preservation of the cingulum in anterior tooth preparations have been advocated. However, their contribution to retention and resistance form has not been evaluated. PURPOSE: The purpose of this in vitro study was to evaluate the retention and resistance failure loads of 2 preparation designs for maxillary anterior teeth. MATERIAL AND METHODS: Forty metal restorations were fabricated and paired with 40 cobalt-chromium prepared tooth analogs...
October 27, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27879518/three-month-evaluation-of-strut-healing-using-a-novel-optical-coherence-tomography-analytical-method-following-bioresorbable-polymer-everolimus-eluting-stent-implantation-in-humans-the-timeless-study
#18
Boris Vesga, Hector Hernandez, Miguel Moncada, Pawel Gasior, Sergio A H Leal, Antonio Dager, Camilo Arana, Juan A Delgado, Philippe Généreux, Akiko Maehara, Juan F Granada
AIMS: Bioresorbable polymer drug-eluting stent technologies have been considered to have the potential to enhance vascular healing by reducing polymer exposure to the vessel wall, potentially allowing the earlier discontinuation of dual antiplatelet therapy. At present, the early vascular healing response to this type of technologies is still unclear. PATIENTS AND METHODS: The TIMELESS study is a multicenter, prospective, single-arm study that enrolled real-world patients undergoing percutaneous coronary intervention...
November 22, 2016: Coronary Artery Disease
https://www.readbyqxmd.com/read/27878315/a-plasmonic-elisa-for-the-naked-eye-detection-of-chromium-ions-in-water-samples
#19
Cuize Yao, Shiting Yu, Xiuqing Li, Ze Wu, Jiajie Liang, Qiangqiang Fu, Wei Xiao, Tianjiu Jiang, Yong Tang
Here, we describe the development of a triangular silver nanoprism (AgNPR) etching-based plasmonic ELISA for the colorimetric determination of Cr(III) levels in environmental water samples. This involved the creation of a novel signal generation system (substrate reaction solution) for a competitive ELISA in which hydrogen peroxide (H2O2) is used to etch triangular AgNPRs, inducing a change in color. This is achieved by controlling the H2O2 concentration that remains after degradation by catalase, which is conjugated to the secondary antibody of the ELISA...
November 22, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27877854/silicon-etch-with-chromium-ions-generated-by-a-filtered-or-non-filtered-cathodic-arc-discharge
#20
Daniele Scopece, Max Döbeli, Daniele Passerone, Xavier Maeder, Antonia Neels, Beno Widrig, Alex Dommann, Ulrich Müller, Jürgen Ramm
The pre-treatment of substrate surfaces prior to deposition is important for the adhesion of physical vapour deposition coatings. This work investigates Si surfaces after the bombardment by energetic Cr ions which are created in cathodic arc discharges. The effect of the pre-treatment is analysed by X-ray diffraction, Rutherford backscattering spectroscopy, scanning electron microscopy and in-depth X-ray photoemission spectroscopy and compared for Cr vapour produced from a filtered and non-filtered cathodic arc discharge...
2016: Science and Technology of Advanced Materials
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