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https://www.readbyqxmd.com/read/28929602/chromium-supplementation-in-women-with-polycystic-ovary-syndrome-systematic-review-and-meta-analysis
#1
Xiao-Lei Tang, Zheng Sun, Lei Gong
AIM: Increasing evidence has suggested that chromium supplementation may improve the clinical symptoms of polycystic ovary syndrome (PCOS), yet the results have been inconsistent. To derive a more precise estimation of the efficacy of chromium, a meta-analysis was performed. METHODS: Studies published in PubMed, EMBASE and the Cochrane Library up to April 2017 were retrieved. Standardized mean differences (SMD) with 95%CI were calculated for net changes using random-effects or fixed-effects models...
September 20, 2017: Journal of Obstetrics and Gynaecology Research
https://www.readbyqxmd.com/read/28929281/cr-oh-3-nps-cnc-hybrid-nanocomposite-a-sorbent-for-adsorptive-removal-of-methylene-blue-and-malachite-green-from-solutions
#2
Farzin Nekouei, Shahram Nekouei, Farzaneh Keshtpour, Hossein Noorizadeh, Shaobin Wang
In this article, Cr(OH)3 nanoparticle-modified cellulose nanocrystal (CNC) as a novel hybrid nanocomposite (Cr(OH)3-NPs-CNC) was prepared by a simple procedure and used as a sorbent for adsorptive removal of methylene blue (MB) and malachite green (MG) from aqueous solution. Different kinetic models were tested, and the pseudo-second-order kinetic model was found more suitable for the MB and MG adsorption processes. The BET and Langmuir models were more suitable for the adsorption processes of MB and MG. Thermodynamic studies suggested that the adsorption of MB and MG onto Cr(OH)3-NPs-CNC nanocomposite was a spontaneous and endothermic process...
September 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28929003/fatal-cobalt-toxicity-after-a-non-metal-on-metal-total-hip-arthroplasty
#3
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/28926383/mri-findings-in-patients-after-small-head-metal-on-metal-total-hip-arthroplasty-with-a-minimum-follow-up-of-10-years
#4
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
#5
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/28924149/antisite-occupation-induced-single-anionic-redox-chemistry-and-structural-stabilization-of-layered-sodium-chromium-sulfide
#6
Zulipiya Shadike, Yong-Ning Zhou, Lan-Li Chen, Qu Wu, Ji-Li Yue, Nian Zhang, Xiao-Qing Yang, Lin Gu, Xiao-Song Liu, Si-Qi Shi, Zheng-Wen Fu
The intercalation compounds with various electrochemically active or inactive elements in the layered structure have been the subject of increasing interest due to their high capacities, good reversibility, simple structures, and ease of synthesis. However, their reversible intercalation/deintercalation redox chemistries in previous compounds involve a single cationic redox reaction or a cumulative cationic and anionic redox reaction. Here we report an anionic redox chemistry and structural stabilization of layered sodium chromium sulfide...
September 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28923787/first-in-man-randomized-comparison-of-buma-supreme-biodegradable-polymer-sirolimus-eluting-versus-durable-polymer-zotarolimus-eluting-coronary-stents-the-pioneer-trial
#7
Clemens von Birgelen, Taku Asano, Giovanni Amoroso, Adel Aminian, Salvatore Brugaletta, Mathias Vrolix, Rosana Hernandez-Antolín, Pim van de Harst, Andres Iñiguez, Luc Janssens, Pieter C Smits, Joanna J Wykrzykowska, Vasco Gama Ribeiro, Helder Periera, Pedro Canas da Silva, Jan J Piek, Yoshinobu Onuma, Patrick W Serruys, Manel Sabaté
AIMS: A second iteration of a sirolimus-eluting stent (SES) that has a biodegradable PLGA-polymer coating with electrografting base layer on a thin-strut (80µm) cobalt-chromium platform (BuMA Supreme; SINOMED, Tianjin, China) has been developed. This first-in-man trial assessed the efficacy and safety of the novel device. METHODS AND RESULTS: This randomized, multi-center, single-blinded, non-inferiority trial compared BuMA Supreme SES versus contemporary durable polymer zotarolimus-eluting stents (ZES) in terms of angiographic in-stent late lumen loss (LLL) at 9-months follow-up as the primary endpoint...
September 19, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28920769/modacrylic-anion-exchange-fibers-for-cr-vi-removal-from-chromium-plating-rinse-water-in-batch-and-flow-through-column-experiments
#8
Seung-Chan Lee, Jin-Kyu Kang, Eun-Hye Sim, Nag-Choul Choi, Song-Bae Kim
The aim of this study was to investigate Cr(VI) removal from chromium-plating rinse water using modacrylic anion-exchange fibers (KaracaronTM KC31). Batch experiments were performed with synthetic Cr(VI) solutions to characterize the KC31 fibers in Cr(VI) removal. Cr(VI) removal by the fibers was affected by solution pH; the Cr(VI) removal capacity was the highest at pH 2 and decreased gradually with a pH increase from 2 to 12. In regeneration and reuse experiments, the Cr(VI) removal capacity remained above 37...
September 18, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28918273/volatile-and-semivolatile-emissions-from-the-pyrolysis-of-almond-shell-loaded-with-heavy-metals
#9
M A Martín-Lara, N Ortuño, J A Conesa
Heavy metal-loaded almond shell was subjected to pyrolysis to understand the effect of the presence of different heavy metals on its thermal degradation. Pyrolysis behavior of native and metal-loaded samples was studied by thermogravimetric analysis. Similar shapes of thermogravimetric curves indicate that the presence of cadmium (Cd), chromium (Cr), copper (Cu), nickel (Ni) and lead (Pb) did not change the main degradation pathways of almond shell. However, the temperature at which the decomposition in each stage takes place at a higher rate and char yield was considerably modified by the presence of Cr and Ni...
September 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28917711/crocodiles-and-alligators-antiamoebic-and-antitumor-compounds-of-crocodiles
#10
Ruqaiyyah Siddiqui, Shareni Jeyamogan, Salwa Mansoor Ali, Fatima Abbas, K A Sagathevan, Naveed Ahmed Khan
Crocodiles exist in unsanitary environments, feed on rotten meat, are often exposed to heavy metals such as arsenic, cadmium, cobalt, chromium, mercury, nickel, lead, selenium, tolerate high levels of radiation, and are amid the very few species to survive the catastrophic Cretaceous-Tertiary extinction event, nonetheless they can live for up to a 100 years. Moreover, as they live in unhygienic conditions, they regularly come across pathogens. Logically, we postulate that crocodiles have established mechanisms to defend themselves from noxious agents as well as protecting themselves from pathogens...
September 13, 2017: Experimental Parasitology
https://www.readbyqxmd.com/read/28917617/change-in-acetabular-cup-orientation-from-supine-to-standing-position-and-its-effect-on-wear-of-highly-crosslinked-polyethylene
#11
Matthew G Teeter, Prateek Goyal, Xunhua Yuan, James L Howard, Brent A Lanting
BACKGROUND: The purpose of this study is to measure acetabular cup position and wear of the highly crosslinked polyethylene liner in the supine and standing position for patients at a minimum of 10 years after the operation. METHODS: A total of 38 patients were recruited at a mean of 12.5 years after the operation. All patients received a single acetabular cup design with a highly crosslinked liner and a 28-mm cobalt-chromium femoral head. Patients underwent supine and standing radiostereometric examinations in which the X-ray sources and detectors were positioned to obtain an anterior-posterior and cross-table lateral radiograph...
August 31, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28916349/offshore-iron-sand-extraction-in-new-zealand-potential-trace-metal-exposure-of-benthic-and-pelagic-biota
#12
Kay Vopel, Chris Pook, Peter Wilson, John Robertson
Plans to exploit an offshore source of iron sand in South Taranaki Bight (STB), New Zealand, caused concerns that such exploitation may expose benthic and pelagic biota to elevated trace metal concentrations. We conducted dilute-acid extractions and standard elutriate tests to investigate the potential of this exploitation to (1) create a new seafloor with elevated trace metal content, (2) mobilise trace metals during iron sand extraction and, (3) enrich the returning process seawater, which feeds iron sand through mills, with trace metals...
September 12, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28914168/synthesis-of-cr-3-doped-tio2-nanoparticles-characterization-and-evaluation-of-their-visible-photocatalytic-performance-and-stability
#13
Sandra Yadira Mendiola-Alvarez, Jorge Luis Guzmán-Mar, Gemma Turnes-Palomino, Fernando Maya-Alejandro, Adolfo Caballero-Quintero, Aracely Hernández-Ramírez, Laura Hinojosa-Reyes
Cr(3+)-doped TiO2 nanoparticles (Ti-Cr) were synthesized by a simple and fast microwave assisted sol-gel method. Ti-Cr catalyst was characterized by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), N2 adsorption-desorption analysis, Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) spectroscopy, X-ray photoelectron spectroscopy (XPS) and zetametry. Ti-Cr is mesoporous and exhibits a specific surface area of 54...
September 15, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28913397/cardiac-transplant-due-to-metal-toxicity-associated-with-hip-arthroplasty
#14
Sheldon Moniz, Sean Hodgkinson, Piers Yates
Concerns regarding metal-on-metal (MoM) bearing couples in total hip arthroplasty are well documented in the literature with cobalt (Co) and chromium (Cr) toxicity causing a range of both local and systemic adverse reactions. We describe the case of a patient undergoing cardiac transplantation as a direct result of Co and Cr toxicity following a MoM hip replacement. Poor implant positioning led to catastrophic wear generating abundant wear particles leading to Co and Cr toxicity, metallosis, bony destruction, elevated metal ion levels, and adverse biological responses...
September 2017: Arthroplasty Today
https://www.readbyqxmd.com/read/28911802/transient-gestational-exposure-to-drinking-water-containing-excess-hexavalent-chromium-modifies-insulin-signaling-in-liver-and-skeletal-muscle-of-rat-progeny
#15
Navaneethabalakrishnan Shobana, Mariajoseph Michael Aruldhas, Lalmuankimi Tochhawng, Ayyalu Loganathan, Sadhasivam Balaji, Mani Kathiresh Kumar, Liaquat Alikhan Sheerin Banu, Ajit Kumar Navin, Chinnaiyan Mayilvanan, Ramachandran Ilangovan, Karundevi Balasubramanian
Chromium (Cr), an essential micronutrient potentiates insulin action, whereas excess hexavalent Cr (CrVI) acts as an endocrine disruptor. Pregnant mothers living in areas abutting industries using the metal and chromite ore dumps are exposed to ground water contaminated with Cr. Nevertheless, the impact of prenatal exposure to excess CrVI on insulin signaling in the progeny remains obscure. We tested the hypothesis "transient gestational exposure to drinking water containing excess CrVI may modify insulin signaling during postnatal life"...
September 11, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28910734/single-simultaneous-and-consecutive-biosorption-of-cr-vi-and-orange-ii-onto-chemically-modified-masau-stones
#16
Ahmad B Albadarin, Samuel Solomon, Tonni Agustiono Kurniawan, Chirangano Mangwandi, Gavin Walker
Novel and low cost chemically modified masau stone (CMMS) was investigated for its biosorption of an anionic azo dye, Orange II (OII), and toxic hexavalent chromium (Cr(VI)) from aqueous systems: individually, simultaneously and consecutively. XPS and FTIR analyses indicated the introduction of quaternary-Nitrogen to the CMMS surface after activation with epichlorohydrin (etherifying agent) and diethylenetriamine (crosslinking agent). The effects of pH, contact time and initial concentration (Co), and loading order on mechanisms of biosorption/reduction of OII and Cr(VI) onto CMMS were examined in detail...
September 11, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28910529/metal-ion-distribution-and-oxygen-vacancies-determine-activity-of-magnetically-recoverable-catalysts-in-methanol-synthesis
#17
Troy Oracko, Rigel Jaquish, Yaroslav B Losovyj, David Gene Morgan, Maren Pink, Barry D Stein, Valentin Yu Doluda, Olga P Tkachenko, Zinaida B Shifrina, Maxim E Grigoriev, Alexander I Sidorov, Esther M Sulman, Lyudmila M Bronstein
Here, we report on the development of novel Zn-, Zn-Cr-, and Zn-Cu-containing catalysts using magnetic silica (Fe3O4-SiO2) as support. Transmission electron microscopy, X-ray powder diffraction, and X-ray photoelectron spectroscopy showed that the iron oxide nanoparticles (NPs) are located in mesoporous silica pores and the magnetite (spinel) structure remains virtually unchanged despite the incorporation of Zn and Cr. According to X-ray photoelectron spectroscopy data, the Zn and Cr species are intermixed within the magnetite structure...
September 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28906435/mitochondrial-biogenesis-in-response-to-chromium-vi-toxicity-in-human-liver-cells
#18
Xiali Zhong, Rita de Cássia da Silveira E Sá, Caigao Zhong
Hexavalent chromium (Cr(VI)) is a ubiquitous environmental pollutant, which poses a threat to human public health. Recent studies have shown that mitochondrial biogenesis can be activated by inflammatory and oxidative stress. However, whether mitochondrial biogenesis is involved in Cr(VI)-induced hepatotoxicity is unclear. Here, we demonstrated the induction of inflammatory response and oxidative stress, as indicated by upregulation of inflammatory factors and reactive oxygen species (ROS). Subsequently, we demonstrated that mitochondrial biogenesis, comprising the mitochondrial DNA copy number and mitochondrial mass, was significantly increased in HepG2 cells exposed to low concentrations of Cr(VI)...
September 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28904413/hexavalent-chromium-reduction-from-pollutant-samples-by-achromobacter-xylosoxidans-shb-204-and-its-kinetics-study
#19
Swapna Tadishetty Hanumanth Rao, Narendra Kumar Papathoti, Ravi Gundeboina, Yahya Khan Mohamed, Gopal Reddy Mudhole, Hameeda Bee
Cr(VI) is most toxic heavy metal and second most widespread hazardous metal compound worldwide. Present work focused on Cr(VI) reduction from synthetic solutions and polluted samples by Achromobacter xylosoxidans SHB 204. It could tolerate Cr(VI) up to 1600 ppm and reduce 500 ppm with 4.5 chromium reductase enzyme units (U) having protein size 30 kDa. Changes in morphology of cells on interaction with Cr(VI) metal ion was also studied using SEM-EDX and FTIR. Microcosm studies in pollutant samples for Cr(VI) reduction and adsorption isotherm with biomass of bacterium was best fitted with Langmuir model along with kinetic studies...
September 2017: Indian Journal of Microbiology
https://www.readbyqxmd.com/read/28902207/preparation-and-characterization-of-crfewtio2-photoanodes-and-their-photoelectrochemical-activities-for-water-splitting
#20
Mohamad Mohsen Momeni, Yousef Ghayeb, Mojgan Shafiei
The chemical bath deposition (CBD) method was successfully applied to prepare WTiO2 nanotube arrays co-deposited with chromium, iron and chromium-iron nanoparticles. Various methods have been used in the characterization of synthetic co-deposited nanostructures. WTiO2 nanotubes can keep the nanotubular structures at low iron concentration in the CBD solution, as indicated by our FESEM results. Iron and chromium can be applied to improve the absorption capability of the WTiO2 nanotubes for the visible-light, according to the UV-Vis results...
September 13, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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