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https://www.readbyqxmd.com/read/28741931/chromium-ii-metal-organic-polyhedra-as-highly-porous-materials
#1
Jinhee Park, Zachary Perry, Ying-Pin Chen, Jaeyeon Bae, Hong-Cai Zhou
Herein we report for the first time the synthesis of Cr(II)-based metal-organic polyhedra (MOPs) and the characterization of their porosities. Unlike the isostructural Cu(II)- or Mo(II)-based MOPs, Cr(II)-based MOPs show unusually high gas uptakes and surface areas. The combination of comparatively robust dichromium paddlewheel units (Cr2-units), cage symmetries, and packing motifs enable these materials to achieve Brunauer-Emmett-Teller surface areas of up to 1000 m2/g. Reducing the aggregation of the Cr(II)-based MOPs upon activation makes their pores more accessible than their Cu(II) or Mo(II) counterparts...
July 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28741576/a-randomized-comparison-of-biodegradable-polymer-and-permanent-polymer-coated-platinum-chromium-everolimus-elutingcoronary-stents-in-china-the-evolve-china-study
#2
YaLing Han, Haiwei Liu, Yuejin Yang, Jian Zhang, Kai Xu, Guosheng Fu, Xi Su, Tiemin Jiang, Wenyue Pang, Jiyan Chen, Zuyi Yuan, Hui Li, Haichang Wang, Tao Hong, Huiliang Liu, Fucheng Sun, Dominic J Allocco, Mingdong Zhang, Keith D Dawkins
AIMS: The EVOLVE China randomized study sought to evaluate clinical safety and effectiveness of the SYNERGY bioabsorbable polymer-coated everolimus-eluting stent (EES) for the treatment of patients with coronary heart disease in China. METHODS AND RESULTS: Eligible patients with de novo native coronary artery lesions were randomized (1:1) to receive the SYNERGY or PROMUS Element Plus (PE Plus) stents. The primary endpoint was in-stent late loss at 9 months. Secondary endpoints included death, MI, revascularization, and stent thrombosis through 12 months...
July 25, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28737077/systematic-screening-of-adverse-reactions-to-metal-debris-after-recap-m2a-magnum-metal-on-metal-total-hip-arthroplasty
#3
H Mäntymäki, M Junnila, P Lankinen, M Seppänen, T Vahlberg, K T Mäkelä
BACKGROUND AND AIMS: An adverse reaction to metal debris is a known complication after large diameter head metal-on-metal total hip arthroplasty. However, the failure rate varies depending on the implant design. Therefore, we investigated the prevalence of adverse reaction to metal debris, as well as the symptoms and risk factors after undergoing a ReCap-M2a-Magnum large diameter head metal-on-metal total hip arthroplasty. MATERIALS AND METHODS: Between 2005 and 2012, 1188 patients (1329 hips) underwent ReCap-M2a-Magnum total hip arthroplasty at our institution...
March 1, 2017: Scandinavian Journal of Surgery: SJS
https://www.readbyqxmd.com/read/28734785/impact-of-magnetic-stirring-on-stainless-steel-integrity-effect-on-biopharmaceutical-processing
#4
Christopher Thompson, Kelly Wilson, Yoen Joo Kim, Min Xie, William K Wang, Michaela Wendeler
Stainless steel containers are widely used in the pharmaceutical and biopharmaceutical industry for the storage of buffers, process intermediates, and purified drug substance. They are generally held to be corrosion resistant, biocompatible, and non-reactive, although it is well established that trace amounts of metal ions can leach from stainless steel equipment into biopharmaceutical products. We report here that the use of stainless steel containers in conjunction with magnetic stirring bars leads to significantly aggravated metal contamination, consisting both of metal particles and significantly elevated metal ions in solution, the degree of which is several orders of magnitude higher than described for static conditions...
July 19, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28734615/highly-cross-linked-polyethylene-reduces-osteolysis-incidence-and%C3%A2-wear-related-reoperation-rate-in-cementless-total-hip-arthroplasty%C3%A2-compared-with-conventional-polyethylene-at%C3%A2-a%C3%A2-mean%C3%A2-12-year-follow-up
#5
Manabu Tsukamoto, Toshiharu Mori, Hideo Ohnishi, Soshi Uchida, Akinori Sakai
BACKGROUND: A number of studies on total hip arthroplasty have compared highly cross-linked polyethylene (HXLPE) with conventional polyethylene (CPE) liners beyond 10 years. However, the impact of HXLPE on the wear-related reoperation rate is unclear. The purpose of this study was to evaluate the clinical advantage of using a single manufacturer's HXLPE in terms of reducing the reoperation rate. METHODS: The study was a follow-up retrospective cohort study over a mean of 12 years that examined patients aged 45-70 years with cementless total hip arthroplasty using a 26-mm-diameter cobalt-chromium head...
July 8, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28733937/sequential-extraction-as-novel-approach-to-compare-12-medicinal-plants-from-kenya-regarding-their-potential-to-release-chromium-manganese-copper-and-zinc
#6
R Mogwasi, S Zor, D K Kariuki, M Z Getenga, V Nischwitz
This study is focusing on a novel approach to screen a large number of medicinal plants from Kenya regarding their contents and availability of selected metals potentially relevant for treatment of diabetes patients. For this purpose, total levels of zinc, chromium, manganese, and copper were determined by flame atomic absorption spectrometry and inductively coupled plasma mass spectrometry as well as BCR sequential extraction to fractionate the elemental species in anti-diabetic medicinal plants collected from five natural locations in two sub counties in Nyamira County, Kenya...
July 21, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28731297/smart-capsules-for-lead-removal-from-industrial-wastewater
#7
Bartosz Tylkowski, Renata Jastrząb
Ground and especially drinking water could be contaminated by heavy metal ions such as lead and chromium, or the metalloid arsenic, discarded from industrial wastewater. These heavy metal ions are regarded as highly toxic pollutants which could cause a wide range of health problems in case of a long-term accumulation in the body. Thus, there have been many efforts to reduce the concentration of lead ions in effluent wastewater. They have included the establishment of stringent permissible discharge levels and management policies, the application of various pollution-control technologies, and the development of adsorbent materials for lead reduction...
April 10, 2017: Metal Ions in Life Sciences
https://www.readbyqxmd.com/read/28730362/removal-of-cr-vi-from-aqueous-solution-using-electrosynthesized-4-amino-3-hydroxynaphthalene-1-sulfonic-acid-doped-polypyrrole-as-adsorbent
#8
Mohamed Lamine Sall, Abdou Karim Diagne Diaw, Diariatou Gningue-Sall, Alexandre Chevillot-Biraud, Nihal Oturan, Mehmet Ali Oturan, Jean-Jacques Aaron
Polypyrrole (PPy) conducting films, doped with 4-amino-3-hydroxynaphthalene sulfonic acid (AHNSA), were electrosynthesized by anodic oxidation of pyrrole on Pt and steel electrodes in aqueous medium (0.01 M AHNSA +0.007 M NaOH, using cyclic voltammetry (CV), and their electrochemical properties were studied. Fourier-transform infrared (FT-IR) spectroscopy confirmed the formation of AHNSA-PPy films. Their morphology was characterized by scanning electron microscopy (SEM), and their optical properties, including UV-VIS absorption and fluorescence spectra, were also investigated...
July 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28730330/effect-of-the-phosphogypsum-amendment-of-saline-and-agricultural-soils-on-growth-productivity-and-antioxidant-enzyme-activities-of-tomato-solanum-lycopersicum-l
#9
Mariem Smaoui-Jardak, Walid Kriaa, Mohamed Maalej, Mohamed Zouari, Lotfi Kamoun, Wassim Trabelsi, Ferjani Ben Abdallah, Nada Elloumi
The objective of this study was to investigate the effects of phosphogypsum (PG) amendment on the physiochemical proprieties of saline and agricultural soils along with the growth, productivity and antioxidant enzyme activities of tomato plants ( Solanum lycopersicum L.) grown on the amended soils under controlled conditions. Obtained results showed that the amendment of saline soil (H) by PG induced a decrease in pH as well as in electrical conductivity. However, for the non saline soil (MC), there was a decrease in pH associated with an increase in electrical conductivity...
July 20, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28728354/spatial-assessment-of-potential-ecological-risk-of-soil-heavy-metals-from-informal-e-waste-recycling-in-ghana
#10
Vincent Nartey Kyere, Klaus Greve, Sampson Atiemo, James Hawkins Ephraim
The rapidly increasing annual global volumes and the inherently valuable fractions of e-waste have created an avenue for individuals in Agbogbloshie, Accra, Ghana to make a living by utilizing unconventional, uncontrolled, primitive and crude procedures to recycle and recover valuable metals from these wastes. The current form of recycling procedures releases hazardous fractions such as heavy metals into the soils posing a significant risk to ecology and human health. 132 soil samples based on 100 m grid intervals were collected using handheld GPS and analyzed for Cadmium (Cd), chromium (Cr), copper (Cu), mercury (Hg), lead (Pb) and zinc (Zn) heavy metals...
July 10, 2017: Environmental Health and Toxicology
https://www.readbyqxmd.com/read/28728048/accumulation-and-detoxification-dynamics-of-chromium-and-antioxidant-responses-in-juvenile-rare-minnow-gobiocypris-rarus
#11
Cong Yuan, Meng Li, Yao Zheng, Ying Zhou, Feili Wu, Zaizhao Wang
Hexavalent chromium (Cr(6+)) compounds are hazardous via all exposure routes. To explore the dynamics of Cr accumulation and elimination and to reveal the mechanisms underlying detoxification and antioxidation in juvenile Gobiocypris rarus, one-month old G. rarus larvae were exposed to 0.1mgL(-1) Cr(6+) for four weeks for accumulation and subsequently placed to clean water for another week for depuration. The contents of Cr were measured weekly in the whole body of G. rarus juveniles. The activities of catalase (CAT), glutathione peroxidase (GPx), superoxide dismutase (SOD), glutathione S-transferase (GST) and glutathione reductase (GR), and contents of glutathione (GSH) and malonaldehyde (MDA), and transcripts of cat, Cu/Zn-sod, Mn-sod, gpx1, gstpi, gr, mt1, nrf2 and uba52 were determined...
July 11, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28728031/applying-a-modified-donnan-model-to-describe-the-surface-complexation-of-chromate-to-iron-oxyhydroxide-agglomerates-with-heteromorphous-pores
#12
Zongsu Wei, Raphael Semiat
In this study, a modified Donnan model (mDM) is incorporated into surface complexation model (SCM) to better understand the physicochemical processes for adsorption of hexavalent chromium, Cr(VI), on porous iron oxyhydroxide agglomerates (IOAs). The mDM includes a chemical potential term μatt to account for ionic transport and electrostatic interaction in micropores (dmi<2nm) which is usually neglected in typical Donnan model (tDM). To estimate the parameters of mDM in a simple and accurate way, a rigorous protocol was presented...
July 11, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28726110/supplementation-of-selenium-vitamin-e-chromium-and-betaine-above-recommended-levels-improves-lactating-performance-of-sows-over-summer
#13
Fan Liu, Jeremy James Cottrell, Cherie Louise Collins, David James Henman, Kirrily Sharon Beatrice O'Halloran, Frank Rowland Dunshea
Heat stress (HS) exacerbates the body weight loss of lactating sows and reduces litter weight gain. Selenium (Se), vitamin E (VE), chromium (Cr) and betaine have been shown to ameliorate symptoms of HS, and yeast nucleotides and mannan oligosaccharides have been reported to improve lactational performance and immune response in pigs. Therefore, a combination of these nutrients may improve lactational performance of sows in summer. The effects of two nutritionally enhanced diets on lactational performance of sows in summer were investigated in two experiments...
July 19, 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/28725970/ion-release-in-ceramic-bearings-for-total-hip-replacement-results-from-an-in-vitro-and-an-in-vivo-study
#14
Jan Philippe Kretzer, Ulrike Mueller, Marcus R Streit, Hartmuth Kiefer, Robert Sonntag, Robert M Streicher, Joern Reinders
INTRODUCTION: Literature on the potential release of trace elements following implantation of Zirconia-platelet toughened alumina (ZPTA) ceramic components is scant. The present study therefore analysed the in vitro and in vivo potential release of ions from ZPTA bearings. MATERIAL AND METHODS: An in vitro and in vivo study was conducted. The in vitro study compared leaching in bovine serum from two groups: ZPTA ceramic heads and Co-28Cr-6Mo alloy heads, both 28-mm diameter...
July 20, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28725152/analysis-of-inorganic-and-organic-constituents-of-myrrh-resin-by-gc-ms-and-icp-ms-an-emphasis-on-medicinal-assets
#15
Syed Rizwan Ahamad, Abdul Rahman Al-Ghadeer, Raisuddin Ali, Wajhul Qamar, Suliman Aljarboa
The aim of the present investigation was to explore the constituents of the Arabian myrrh resin obtained from Commiphora myrrha. The organic and inorganic composition of the myrrh gum resin has been investigated using gas chromatography-mass spectrometry (GC-MS) and inductively coupled plasma-mass spectrometry (ICP-MS). Analysis executed by ICP-MS reveals the presence of various inorganic elements in significant amount in the myrrh resin. The elements that were found to be present in large amounts include calcium, magnesium, aluminum, phosphorus, chlorine, chromium, bromine and scandium...
July 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28724223/chromium-vi-adsorption-from-wastewater-using-porous-magnetite-nanoparticles-prepared-from-titanium-residue-by-a-novel-solid-phase-reduction-method
#16
Genkuan Ren, Xinlong Wang, Penghui Huang, Benhe Zhong, Zhiye Zhang, Lin Yang, Xiushan Yang
Porous magnetite nanoparticles were successfully synthesized by reduction of titanium residue with pyrite under nitrogen protection, and characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, vibrating sample magnetometer, X-ray photoelectron spectroscope, zeta potential and Brunauer-Emmett-Teller method. The XRD analysis confirmed the formation of porous magnetite nanoparticles with single spinel structure. The SEM image demonstrated that porous magnetite nanoparticles displayed spherical shape with the average diameter of ~51nm...
July 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28722486/neurotoxic-effects-of-subchronic-intratracheal-mn-nanoparticle-exposure-alone-and-in-combination-with-other-welding-fume-metals-in-rats
#17
Zsuzsanna Máté, Edina Horváth, András Papp, Krisztina Kovács, Etelka Tombácz, Dániel Nesztor, Tamás Szabó, Andrea Szabó, Edit Paulik
Manganese (Mn) is a toxic heavy metal exposing workers in various occupational settings and causing, among others, nervous system damage. Metal fumes of welding, a typical source of Mn exposure, contain a complex mixture of metal oxides partly in nanoparticle form. As toxic effects of complex substances cannot be sufficiently understood by examining its components separately, general toxicity and functional neurotoxicity of a main pathogenic welding fume metal, Mn, was examined alone and combined with iron (Fe) and chromium (Cr), also frequently found in fumes...
July 19, 2017: Inhalation Toxicology
https://www.readbyqxmd.com/read/28719337/determination-of-some-heavy-metals-in-mastacembelus-mastacembelus-banks-solander-1794-in-terms-of-public-health
#18
M Eroğlu, M Düşükcan, Ö Canpolat, M Çalta, D Şen
In this study, the accumulation of some heavy metals in spiny eel (Mastacembelus mastacembelus Banks and Solander, 1794) living in Karakaya Dam Lake was determined and human health risk of this fish when consumed as food was examined. For this purpose, the amounts of copper (Cu), chromium (Cr), cadmium(Cd), iron (Fe), zinc (Zn) in water samples and in the muscle tissues of the fishes were determined. The amounts of heavy metals showed differences in the muscle tissues of Mastacembelus mastacembelus according to weight, length, sex and age groups of fish...
May 20, 2017: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/28718246/effect-of-cobalt-chromium-alloy-re-use-in-dentistry-on-its-castability-value
#19
Yogendra Imran, Muhammad Raza, Muhammad Sartaj Khan, Yousaf Hayat
BACKGROUND: Re-use of dental casting alloy is a routine practice, which is carried out with the motive to conserve resources. There have been studies on the re-use of alloys but a controversy exists as to the proportioning ratio of fresh to used alloy and the number of time an alloy can be recast. The objective of the study was to measure the effect of addition of 50% by weight used alloy to the fresh Cobalt-Chromium alloy on the castability. METHODS: In the present in-vitro experimental study A total of 20 specimens were cast by flame centrifuge, using modified Whitlock's method...
April 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/28717650/removal-of-cu-zn-pb-and-cr-from-yangtze-estuary-using-the-phragmites-australis-artificial-floating-wetlands
#20
Xiaofeng Huang, Feng Zhao, Gao Yu, Chao Song, Zhi Geng, Ping Zhuang
Contamination of heavy metals would threaten the water and soil resources; phytoremediation can be potentially used to remediate metal contaminated sites. We constructed the Phragmites australis artificial floating wetlands outside the Qingcaosha Reservoir in the Yangtze Estuary. Water characteristic variables were measured in situ by using YSI Professional Pro Meter. Four heavy metals (copper, zinc, lead, and chromium) in both water and plant tissues were determined. Four heavy metals in estuary water were as follows: 0...
2017: BioMed Research International
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