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Wei Liu, Lin Zhu, Junwei Han, Fen Jiao, Wenqing Qin
Sulfidation is a widely used technology to improve the floatability of oxidized metal minerals or to stabilize the heavy metals in various wastes. The sulfidation mechanism of ZnO with pyrite was detailedly studied by thermodynamic calculation and roasting experiments. The sulfidation behaviors, phase transformations, microscopic morphology and surface properties were investigated by TG-DSC, ICP, XRD, SEM-EDS, and XPS analysis. The results indicate that the nature of the sulfidation is the reaction of ZnO with the gaseous sulfur generated by the decomposition of pyrite...
June 22, 2018: Scientific Reports
M T Chu, W Dong, R Chi, L Pan, H Y Li, D Y Hu, X Yang, F R Deng, X B Guo
OBJECTIVE: To analyze the effect of domestic high-efficiency particulate air (HEPA) purifiers on the concentrations of indoor fine particulate matter (PM2.5 ) and its elementary constituents in 20 residences in a district of Beijing during winter. METHODS: From November 2015 to January 2016, 20 residences in a district of Beijing were selected, where indoor and outdoor PM2.5 data were collected simultaneously in three time periods according to the operating of air purifiers (Group 0 h: 24 hours before operating; Group 24 h: 24 hours after operating; Group 48 h: 24 to 48 hours after operating)...
June 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Y Sun, L Jin
OBJECTIVE: To explore the levels of blood manganese concentration in pregnant women in 1st and 2nd trimester and the associated factors in three counties of northern China. METHODS: We carried out a cross-sectional investigation in three counties of northern China in 2010. Two hundred and seventy three pregnant women whose gestational age was less than 28 weeks were recruited, their demographic characteristics and information on exposure to indoor air pollution from coal combustion and dietary during one month before pregnancy till the date of investigation were collected with questionnaires by face-to-face interview, their fasting venous whole blood samples were collected with vacuum blood collection tube containing heparin lithium at the Maternal and Child Health Hospital in the three counties...
June 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Ivana Todorić Laidlaw, Ninoslav Mimica, Berislav Momčilović, Jasna Jurasović, Sandra Caratan, Igor Filipčić, Sandra Vuk Pisk, Žarko Bajić, Stipe Drmić
BACKGROUND: Significant inconsistencies exist in findings on association of bio-elements (BE) concentrations and schizophrenia. Hypothesis of this research was that different concentrations of BE are associated with different psychopathological schizophrenia symptoms. SUBJECTS AND METHODS: This cross-sectional study was performed from 2014 to 2016 at Psychiatric Hospital "Sveti Ivan" and University Psychiatric Hospital "Vrapče", Zagreb, Croatia, on the consecutive sample of 67 patients diagnosed with schizophrenia...
June 2018: Psychiatria Danubina
Irfan Ullah, Ali Haider, Nasir Khalid, Saqib Ali, Sajjad Ahmed, Yaqoob Khan, Nisar Ahmed, Muhammad Zubair
Tungsten-doped TiO2 (W@TiO2 ) nanoparticles, with different percentages of atomic tungsten dopant levels (range of 0 to 6 mol%) have been synthesized by the sol-gel method and characterized by UV-Visible spectroscopy, XRD, SEM, EDX, ICP-OES and XPS analysis. By means of UV-Vis spectroscopy, it has been observed that with 6 mol% tungsten doping the wavelength range of excitation of TiO2 has extended to the visible portion of spectrum. Therefore, we evaluated the photocatalytic activity of W@TiO2 catalysts for the degradation of Congo red dye under varying experimental parameters such as dopant concentration, catalyst dosage, dye concentrations and pH...
June 13, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Rocio I R Macias, Sonia Matilla, Elisa Lozano, Maria C Estiú, Ronald Pj Oude Elferink, Jose J G Marin
Intrahepatic cholestasis of pregnancy (ICP) is frequently accompanied by pruritus, whose etiology has been associated with an enhanced production of lysophosphatidic acid (LPA) by the combined action of phospholipase A1/A2 (PLA1/PLA2) and autotaxin (ATX). Here we have investigated whether the placenta is involved in LPA release to maternal circulation during ICP. Serum levels of ATX and LPA (determined by ELISA) were elevated in women with ICP, and a correlation between both parameters was found. No relationship between serum levels of ATX or LPA and bile acids was found...
June 21, 2018: American Journal of Physiology. Gastrointestinal and Liver Physiology
M A Jordaan, M E Mimba, S C NguemheFils, B T Edith-Etakah, M Shapi, J Penaye, T C Davies
This study was designed to determine the extent to which alluvial and bedrock gold mining activities in the Kette-Batouri region of Eastern Cameroon are responsible for the discharge of potentially harmful elements (PHEs) into natural water bodies. This is considered to be of great public concern, since elevated levels of PHEs in these water bodies, which are widely used for domestic purposes, could have adverse health and environmental effects on the population and nearby ecosystems. The investigation into the levels of PHEs in natural water bodies of this area was conducted to ascertain the toxicity posed by mine waste stockpiles as data from the literature on this subject are scarce...
June 21, 2018: Environmental Monitoring and Assessment
Sonu Gupta, Nisha Chandna, Pooja Dubey, Ajai K Singh, Nidhi Jain
Copper chalcogenide nanoparticles (Cu7S4) supported on graphene oxide (GO) have been synthesized for the first time from Cu2S, and used as highly efficient heterogeneous catalysts for oxidative ortho-selective C-H aminomethylation of phenols with N,N-dimethylbenzylamines. The NPs (30-80 nm) have been characterized by HRTEM, SEM-EDX, PXRD, FTIR, Raman, ICP-AES and XPS analyses. The NP catalyzed sp2-sp3 cross dehydrogenative coupling (CDC) features a broad substrate scope, excellent functional group tolerance, high yields, use of an inexpensive and reusable copper catalyst, mild conditions, and no need for pre-functionalization of substrates...
June 21, 2018: Chemical Communications: Chem Comm
Jihion Yu, Jun Hyuk Hong, Jun-Young Park, Jai-Hyun Hwang, Seong-Sik Cho, Young-Kug Kim
BACKGROUND: Robot-assisted laparoscopic prostatectomy (RALP) requires pneumoperitoneum and the Trendelenburg position to optimize surgical exposure, which can increase intracranial pressure (ICP). Anesthetic agents also influence ICP. We compared the effects of propofol and sevoflurane on sonographic optic nerve sheath diameter (ONSD) as a surrogate for ICP in prostate cancer patients who underwent RALP. METHODS: Thirty-six patients were randomly allocated to groups receiving propofol (propofol group, n = 18) or sevoflurane (sevoflurane group, n = 18) anesthesia...
June 20, 2018: BMC Anesthesiology
Srinivasan Natarajan, Gargi Dutta, Ajay Kumar Jana, M Eswaramoorthy, Deeraj Kumar Singh
A new porphyrin based compound, [Zn3(C40H24N8)(C20H8N2O4)2(DEF)2](DEF)3 (1) has been synthesized employing 5,10,15,20-tetrakis(4-pyridyl)porphyrin (H2TPyP), 1,2-diamino-3,6-bis(4-carboxyphenyl)benzene and Zn2+ salt at 100ºC under solvothermal condition. The structure, determined by single crystal X-ray diffraction studies, is three dimensional with three-fold interpenetration. The usefulness of free -NH2 groups in the ligand was exploited for anchoring Ag-nanoparticles via a simple solution-based route. The Ag-loaded sample, Ag@1, was characterized by PXRD, EDS, HRTEM, SEM, XPS and ICP-MS analysis which clearly indicate Ag-nanoparticles with size of 3...
June 20, 2018: Chemistry, An Asian Journal
Abrar Al-Mahmood Siddiquee, P Ganesan Adaikan, Lang Chu Lau, Baharudin Bin Said, Mark Chong, Jerry Chan, Swee Hin Teoh
AIM: To investigate the effect of intracavernous injection of human umbilical cord blood derived endothelial colony forming cells (HUCB ECFCs) on erectile dysfunction (ED) in Zucker Diabetic Fatty (ZDF) rat model. METHODS: Erectile function was assessed by cavernous nerve electrostimulation in ZDF rats aged 20-28 weeks. Following confirmation of severe ED at the age of 28 weeks, 21 ZDF rats were randomly assigned to three experimental groups: 1 million ECFCs, 2 million ECFCs, and phosphate buffered saline (PBS)...
June 16, 2018: Life Sciences
Manuel Contreras Llanes, Manuel Jesús Gázquez González, Silvia María Pérez Moreno, Juan Pedro Bolívar Raya
This work is focused on the manufacture of commercial cement using as additive ilmenite mud, a waste generated during TiO2 pigment production. The cements were produced by adding different proportions of mud (2.5, 5 and 10 wt%) to ordinary Portland cement (OPC). The ilmenite mud and the ilmenite mud cements (IMCs) were characterised physico-chemically by X-ray fluorescence (XRF), inductively coupled plasma mass spectrometry (ICP-MS) and X-ray diffraction (XRD). Moreover, the technological properties of the IMCs were evaluated and compared with a reference material (OPC)...
June 19, 2018: Environmental Science and Pollution Research International
Grant Quiller, Ángel Mérida-Ortega, Stephen J Rothenberg, Mariano E Cebrián, A Jay Gandolfi, Francisco Franco-Marina, Lizbeth López-Carrillo
Inorganic arsenic (iAs) exposure increases risk of several diseases, including cancer. Some nutrients such as flavonoids enhance glutathione activity, which in turn play a key role in iAs elimination. Our objective was to explore whether dietary non-soy flavonoids are associated with iAs metabolism. We hypothesized that the intake of flavonoids belonging to the following groups, flavan-3-ols, flavone, flavonol, flavanone, and anthocyanidin, is positively associated with urinary dimethylarsinic acid (DMA), which is the most soluble iAs metabolite excreted...
July 2018: Nutrition Research
Suvi-Tuulia Hämäläinen, Kaisa Turunen, Kari J Mattila, Markku Sumanen
BACKGROUND: The aim of this study was to determine whether intrahepatic cholestasis of pregnancy (ICP) is associated with causes of death during on average 35 years follow-up after the delivery. METHODS: The study population comprised 571 women with ICP in at least one pregnancy seen at Tampere University Hospital, Finland, between 1969 and 1988. ICP was verified from patient records. The previous and following subjects in the maternity ward diary were taken as controls for each ICP case...
June 19, 2018: BMC Women's Health
Suzanne A Apodaca, Illya A Medina-Velo, Alek C Lazarski, Juan P Flores-Margez, Jose R Peralta-Videa, Jorge L Gardea-Torresdey
The relationship between engineered nanomaterials and plant biostimulants is unclear. In this study, kidney bean (Phaseolus vulgaris) plants were grown to maturity (90 days) in soil amended with nano copper (nCu), bulk copper (bCu), or copper chloride (CuCl2 ) at 0, 50, or 100 mg kg-1 , then watered with 0, 10, or 100 μM of kinetin (KN). Seeds were harvested and analyzed via ICP-OES and biochemical assays. While seed production was largely unaffected, nutritional value was significantly impacted. Accumulation of Cu was enhanced by 5-10% from controls by Cu-based treatments...
September 15, 2018: Science of the Total Environment
Dongjin Wan, Lairong Wu, Yongde Liu, Hailiang Zhao, Jun Fu, Shuhu Xiao
In this study, cow dung biochar (CDB) and ferric chloride-modified CDB (Fe@CDB) were synthesized to remove low concentration perchlorate from water. The pseudo-second-order kinetics model was used and satisfactorily described perchlorate removal onto CDB and Fe@CDB. The Langmuir model fit the experimental isotherm data better than the Freundlich model. The maximum adsorption capacity obtained using the Langmuir model was 1787 μg/g for Fe@CDB and 304 μg/g for CDB. The detrimental effects of coexisting anions decreased as: NO3 -  > SO4 2 -  > Cl- ...
September 15, 2018: Science of the Total Environment
Andrew R C Grigg, Ruben Kretzschmar, Robin S Gilli, Jan G Wiederhold
Environmental mercury (Hg) pollution is a matter of global concern. Mercury speciation controls its environmental behaviour, and stable isotope ratios can potentially trace Hg movement through environmental compartments. Here we investigated Hg in industrially contaminated soils and sediments (Visp, Valais, Switzerland) using concentration and stable isotope analysis (CV-MC-ICP-MS) of total digests, and a four-step sequential extraction procedure. The sequential extraction employed (1) water (labile Hg species), (2) NaOH or Na4 P2 O7 (organically-bound Hg), (3) hydroxylamine-HCl (Hg bound to Mn and Fe (oxyhydr)oxides), and (4) aqua regia (residual Hg pools)...
September 15, 2018: Science of the Total Environment
A G Arranja, W E Hennink, A G Denkova, R W A Hendrikx, J F W Nijsen
The aim of this study was the development of radioactive holmium phosphate microspheres (HoPO4 -MS) with a high holmium content and that are stable in human serum for selective internal radiation therapy (SIRT) of liver cancer. To this end, holmium acetylacetonate microspheres (HoAcAc-MS) were prepared (34.2 ± 1.0 µm in diameter, holmium content of 46.2 ± 0.8 and density of 1.7 g/cm3 ) via an emulsification and solvent evaporation method. The concentration of HoAcAc in the organic solvent, the temperature of emulsification and the stirring speed were varied for the preparation of the HoAcAc-MS to obtain microspheres with different diameters ranging from 11 to 35 µm...
June 15, 2018: International Journal of Pharmaceutics
George Yaw Hadzi, David Kofi Essumang, Godwin A Ayoko
Heavy metal contamination of selected rivers in Ghana was studied as part of a bigger project aimed at setting background standard for heavy metals in the Ghanaian environment. Water samples were collected from major mining and eight pristine areas. The samples were acid digested with aqua-regia and analyzed with ICP-MS for As, Cd, Hg, Zn, Cu, Mn, Fe, Cr, Al, V, Co, Ni, and Pb. The average concentrations (mg/L) from the pristine sites ranged from 0.002 ± 0.00(As) to 0.929 ± 0.06 (Fe) and 0.002 ± 0...
June 16, 2018: Environmental Monitoring and Assessment
Ming-Ming Li, Jia Cao, Jia-Chun Yang, Yu-Jie Shen, Xiao-Lei Cai, Yuan-Wen Chen, Chun-Ying Qu, Yi Zhang, Feng Shen, Min Zhou, Lei-Ming Xu
Quantum dots (QDs) conjugated with arginine-glycine-aspartic acid (RGD) peptides (which are integrin antagonists) are novel nanomaterials with the unique optical property of high molar extinction coefficient, and they have potential utility as photosensitizers in photodynamic therapy (PDT). Our group previously demonstrated significant benefits of using PDT with QD-RGD on pancreatic tumor cells. This study aimed to evaluate the biodistribution and toxicity of QD-RGD in mice prior to in vivo application. Mice with pancreatic neoplasms were intratumorally injected with varying doses of QD-RGD, and the biodistribution 0-24 h post injection was compared to that in control mice (intravenously injected with unconjugated QD)...
June 14, 2018: Chemico-biological Interactions
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