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https://www.readbyqxmd.com/read/28646768/source-profiling-of-arsenic-and-heavy-metals-in-the-selangor-river-basin-and-their-maternal-and-cord-blood-levels-in-selangor-state-malaysia
#1
Nobumitsu Sakai, Zohour Alsaad, Nguyen Thi Thuong, Kenji Shiota, Minoru Yoneda, Mustafa Ali Mohd
Arsenic and 5 heavy metals (nickel, copper, zinc, cadmium and lead) were quantitated in surface water (n = 18) and soil/ore samples (n = 45) collected from 5 land uses (oil palm converted from forest, oil palm in peat swamp, bare land, quarry and forest) in the Selangor River basin by inductively coupled plasma mass spectrometry (ICP-MS). Geographic information system (GIS) was used as a spatial analytical tool to classify 4 land uses (forest, agriculture/peat, urban and bare land) from a satellite image taken by Landsat 8...
June 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28646298/an-on-off-on-fluorescent-probe-for-ascorbic-acid-based-on-cu-zncds-quantum-dots-and-%C3%AE-mno2-nanorods
#2
Hanbing Rao, Yao Gao, Hongwei Ge, Zhaoyi Zhang, Xin Liu, Yan Yang, Yaqin Liu, Wei Liu, Ping Zou, Yanying Wang, Xianxiang Wang, Hua He, Xianying Zeng
This work established a fluorescence approach for detecting ascorbic acid (AA) based on Cu-ZnCdS quantum dots (Cu-ZnCdS QDs) and α-MnO2 nanorods. Cu-ZnCdS QDs and α-MnO2 nanorods were characterized by high-resolution transmission electron microscopy (HRTEM), fluorescence spectroscopy, inductively coupled plasma optical emission spectroscopy (ICP-OES) and X-ray diffraction (XRD). In the presence of α-MnO2 nanorods, the fluorescence of Cu-ZnCdS QDs was greatly quenched through the inner filter effect (IFE)...
June 23, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28646227/size-dependent-uptake-and-hemolytic-effect-of-zinc-oxide-nanoparticles-on-erythrocytes-and-biomedical-potential-of-zno-ferulic-acid-conjugates
#3
E Preedia Babu, A Subastri, A Suyavaran, K Premkumar, V Sujatha, B Aristatile, Ghedeir M Alshammari, V Dharuman, C Thirunavukkarasu
Despite zinc oxide nanoparticles (ZnONPs) being increasingly used as carriers in biomedical fields due to their multifaceted properties and therapeutic importance, better understanding of the mechanisms and cellular consequences resulting from their interaction with cells and cellular components has been warranted. In the present study, we investigate the size-dependent interaction of ZnONPs on RBCs, and its impact on cell viability, DNA damage, ROS generation and morphological changes, employing cellular and analytical methods...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28645657/gross-pathology-physiological-and-toxicological-responses-in-relation-to-metals-and-persistent-organic-pollutants-pops-burden-in-tilapia-species-from-ogun-river-nigeria
#4
Oju R Ibor, Aina O Adeogun, Azubuike V Chukwuka, Augustine Arukwe
We have investigated gross pathology, physiological (steroid precursors) and toxicological responses (oxidative stress and phase II biotransformation) in relation to tissue contaminant burden in Tilapia species along the entire length (320 km) of Ogun River, Nigeria. The Ogun River is the longest and largest river in Southwestern Nigeria located along heavily industrialized cities and receives complex mixtures of effluents. A total of 1074 tilapias were collected from three sampling points (Abeokuta, Isheri and Ikorodu) and from an upstream control point (Igboho) and evaluated for gross pathological changes, hepatic transcript levels for oxidative stress and phase II biotransformation responses...
June 8, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28645637/antimicrobial-and-biological-activity-of-leachate-from-light-curable-pulp-capping-materials
#5
Maria Teresa Arias-Moliz, Cher Farrugia, Christie Y K Lung, Pierre Schembri Wismayer, Josette Camilleri
OBJECTIVES: Characterization of a number of pulp capping materials and assessment of the leachate for elemental composition, antimicrobial activity and cell proliferation and expression. METHODOLOGY: Three experimental light curable pulp-capping materials, Theracal and Biodentine were characterized by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The elemental composition of the leachate formed after 24hours was assessed by inductively coupled plasma (ICP)...
June 20, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28645586/venous-sinus-stenting-in-the-management-of-patients-with-intracranial-hypertension-manifesting-with-skull-base-cerebrospinal-fluid-leaks
#6
Rajiv R Iyer, David Solomon, Abhay Moghekar, C Rory Goodwin, Charles M Stewart, Masaru Ishii, Philippe Gailloud, Gary L Gallia
BACKGROUND: A subset of patients with skull base cerebrospinal fluid (CSF) leaks are found to have elevated intracranial pressure (ICP). In these patients, elevated ICP is thought to contribute to both the pathophysiology of the leak as well as postoperative leak recurrences. Current strategies for post-operative ICP control include medical therapy and shunting procedures. The aim of this study is to report the use of venous sinus stenting (VSS) in the management of patients with skull base CSF leaks due to elevated ICP...
June 20, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28644400/evaluation-of-sources-and-patterns-of-elemental-composition-of-pm2-5-at-three-low-income-neighborhood-schools-and-residences-in-quito-ecuador
#7
Amit U Raysoni, Rodrigo X Armijos, M Margaret Weigel, Patricia Echanique, Marcia Racines, Nicholas E Pingitore, Wen-Whai Li
Elemental characterization of fine particulate matter was undertaken at schools and residences in three low income neighborhoods in Quito, Ecuador. The three zones were located in the northern (Cotocollao), south central (El Camal), and south east (Los Chillos) neighborhoods and were classified as zones 1-3, respectively. Forty elements were quantified via ICP-MS analysis. Amongst the geogenic elements, the concentration of Si was the most abundant followed by S, Al, and Ca. Elements with predominantly anthropogenic sources such as Zn, V, and Ni were higher in zone 3 school followed by zone 2 and zone 1 schools...
June 23, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28643998/survey-in-expert-clinicians-on-validity-of-automated-calculation-of-optimal-cerebral-perfusion-pressure
#8
Romy Steijn, Roy Stewart, Marek Czosnyka, Joseph Donnelly, Ari Ercole, Antony Absalom, Jan W Elting, Christina Haubrich, Peter Smielewski, Marcel Aries
BACKGROUND: Optimal cerebral perfusion pressure (CPPopt) targeting in traumatic brain injury (TBI) patients constitutes an active and controversial area of research. It has been suggested that an autoregulation guided CPP therapy may improve TBI outcome. Prerequisites of a CPPopt intervention study would be objective criteria for the CPPopt detection.. This study compared the agreement between automated and visual CPPopt detection. METHODS: Twenty-five clinicians from 18 centres worldwide, familiar with brain monitoring and using dedicated software, reviewed ten 4-hour CPPopt screenshots at 48 hrs after ictus in selected TBI patients...
June 22, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/28643002/genotoxicity-testing-of-different-surface-functionalized-sio2-zro2-and-silver-nanomaterials-in-3d-human-bronchial-models
#9
Andrea Haase, Nils Dommershausen, Markus Schulz, Robert Landsiedel, Philipp Reichardt, Benjamin-Christoph Krause, Jutta Tentschert, Andreas Luch
Inhalation is considered a critical uptake route for NMs, demanding for sound toxicity testing using relevant test systems. This study investigates cytotoxicity and genotoxicity in EpiAirway™ 3D human bronchial models using 16 well-characterized NMs, including surface-functionalized 15 nm SiO2 (4 variants), 10 nm ZrO2 (4), and nanosilver (3), ZnO NM-110, TiO2 NM-105, BaSO4 NM-220, and two AlOOH NMs. Cytotoxicity was assessed by LDH and ATP assays and genotoxicity by the alkaline comet assay. For 9 NMs, uptake was investigated using inductively coupled plasma-mass spectrometry (ICP-MS)...
June 22, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28641226/evaluation-of-trace-element-concentration-in-cancerous-and-non-cancerous-tissues-of-human-stomach
#10
Shadi Kohzadi, Farshad Sheikhesmaili, Ramesh Rahehagh, Baran Parhizkar, Ebrahim Ghaderi, Hozan Loqmani, Behzad Shahmoradi, Ebrahim Mohammadi, Afshin Maleki
Gastric cancer has a high mortality rate in west of Iran. Various environmental elements are proposed as cancer risk factors including trace elements. Trace elements can induce initiation or progression of carcinogenesis via oxidative stress and DNA injury. The aim of this study was to measure and compare some trace element concentration (Ca, Cu, Fe, As, Mg, Ni, Cd and Cr) in gastric cancer tissues and normal tissues. For this purpose, 35 patients with gastric cancer and 30 without any cancer were biopsied...
June 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28641183/size-partitioning-and-mixing-behavior-of-trace-metals-and-dissolved-organic-matter-in-a-south-china-estuary
#11
Wenhao Wang, Min Chen, Laodong Guo, Wen-Xiong Wang
The Jiulong River estuary, located in the southeastern China, suffered from metal pollution due to industrial effluent releases. Mixing of effluent and estuarine water may have significantly affected the size distribution of trace metals and their environmental fate. In the present study, colloidal size distribution of organic matter and selected metals were quantified using asymmetric flow field-flow fractionation (AF4) and ICP-MS. We demonstrated a dominance of dissolved metals in the 1-10kDa fraction, and metals such as Cu, Zn, Ni, Co, Pb, Cd and Mn were mostly regulated by terrestrial fulvic acid...
June 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28641068/centric-relation-intercuspal-position-discrepancy-and-its-relationship-with-temporomandibular-disorders-a-systematic-review
#12
Antonio Jiménez-Silva, Julio Tobar-Reyes, Sheilah Vivanco-Coke, Eduardo Pastén-Castro, Hernán Palomino-Montenegro
OBJECTIVE: The objective of this study is to assess the relationship between centric relation-intercuspal position discrepancy (CR-ICP discrepancy) and temporomandibular disorders (TMDs), by systematically reviewing the literature. MATERIALS AND METHODS: A systematic research was performed between 1960 and 2016 based on electronic databases: PubMed, Cochrane Library, Medline, Embase, Scopus, EBSCOhost, BIREME, Lilacs and Scielo, including all languages. Analytical observational clinical studies were identified...
June 22, 2017: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/28639043/ultrasonographic-optic-nerve-sheath-diameter-for-predicting-elevated-intracranial-pressure-during-laparoscopic-surgery-a-systematic-review-and-meta-analysis
#13
Eun Jung Kim, Bon-Nyeo Koo, Seung Ho Choi, Kyoungun Park, Min-Soo Kim
BACKGROUND: Laparoscopic surgery involves the creation of a carbon dioxide (CO2) pneumoperitoneum to facilitate a clear surgical view, which may result in an elevated intracranial pressure (ICP). Depending on the surgical area, steep Trendelenburg positioning may be used as well, further increasing the ICP. The objective of this study was to assess the effects of laparoscopic surgery on changes in ICP assessed by ultrasonographic measurement of optic nerve sheath diameter (ONSD), which is a generally accepted simple, reliable, and non-invasive ICP measurement technique...
June 21, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28638373/interactions-between-food-additive-silica-nanoparticles-and-food-matrices
#14
Mi-Ran Go, Song-Hwa Bae, Hyeon-Jin Kim, Jin Yu, Soo-Jin Choi
Nanoparticles (NPs) have been widely utilized in the food industry as additives with their beneficial characteristics, such as improving sensory property and processing suitability, enhancing functional and nutritional values, and extending shelf-life of foods. Silica is used as an anti-caking agent to improve flow property of powered ingredients and as a carrier for flavors or active compounds in food. Along with the rapid development of nanotechnology, the sizes of silica fall into nanoscale, thereby raising concerns about the potential toxicity of nano-sized silica materials...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28636040/tamoxifen-like-metallocifens-target-the-thioredoxin-system-determining-mitochondrial-impairment-leading-to-apoptosis-in-jurkat-cells
#15
Valeria Scalcon, Michèle Salmain, Alessandra Folda, Siden Top, Pascal Pigeon, Hui Zhi Shirley Lee, Gérard Jaouen, Alberto Bindoli, Anne Vessières, Maria Pia Rigobello
Tamoxifen-like metallocifens (TLMs) of the group-8 metals (Fe, Ru, and Os) show strong anti-proliferative activity on cancer cell lines resistant to apoptosis, owing to their unique redox properties. In contrast, the thioredoxin system, which is involved in cellular redox balance, is often overexpressed in cancer cells, especially in tumour types resistant to standard chemotherapies. Therefore, we investigated the effect of these three TLMs on the thioredoxin system and evaluated the input of the metallocene unit in comparison with structurally related organic tamoxifens...
June 21, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28634763/results-of-an-interlaboratory-method-performance-study-for-the-size-determination-and-quantification-of-silver-nanoparticles-in-chicken-meat-by-single-particle-inductively-coupled-plasma-mass-spectrometry-sp-icp-ms
#16
Stefan Weigel, Ruud Peters, Katrin Loeschner, Ringo Grombe, Thomas P J Linsinger
Single-particle inductively coupled plasma mass spectrometry (sp-ICP-MS) promises fast and selective determination of nanoparticle size and number concentrations. While several studies on practical applications have been published, data on formal, especially interlaboratory validation of sp-ICP-MS, is sparse. An international interlaboratory study was organized to determine repeatability and reproducibility of the determination of the median particle size and particle number concentration of Ag nanoparticles (AgNPs) in chicken meat...
June 20, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28634595/role-of-repeat-muscle-compartment-pressure-measurements-in-chronic-exertional-compartment-syndrome-of-the-lower-leg
#17
Aniek P M van Zantvoort, Johan A de Bruijn, Michiel B Winkes, Adwin R Hoogeveen, Joep A W Teijink, Marc R Scheltinga
BACKGROUND: The diagnostic gold standard for diagnosing chronic exertional compartment syndrome (CECS) is a dynamic intracompartmental pressure (ICP) measurement of the muscle. The potential role of a repeat ICP (re-ICP) measurement in patients with persistent lower leg symptoms after surgical decompression or with ongoing symptoms after an earlier normal ICP is unknown. PURPOSE: To study whether re-ICP measurements in patients with persistent CECS-like symptoms of the lower leg may contribute to the diagnosis of CECS after both surgical decompression and a previously normal ICP measurement...
June 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28634463/protective-effect-of-n-acetylcysteine-amide-on-blast-induced-increase-in-intracranial-pressure-in-rats
#18
Usmah Kawoos, Richard M McCarron, Mikulas Chavko
Blast-induced traumatic brain injury is associated with acute and possibly chronic elevation of intracranial pressure (ICP). The outcome after TBI is dependent on the progression of complex processes which are mediated by oxidative stress. So far, no effective pharmacological protection against TBI exists. In this study, rats were exposed to a single or repetitive blast overpressure (BOP) at moderate intensities of 72 or 110 kPa in a compressed air-driven shock tube. The degree and duration of the increase in ICP were proportional to the intensity and frequency of the blast exposure(s)...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28634385/vertical-and-bevel-structured-sic-etching-techniques-incorporating-different-gas-mixture-plasmas-for-various-microelectronic-applications
#19
Ho-Kun Sung, Tian Qiang, Zhao Yao, Yang Li, Qun Wu, Hee-Kwan Lee, Bum-Doo Park, Woong-Sun Lim, Kyung-Ho Park, Cong Wang
This study presents a detailed fabrication method, together with validation, discussion, and analysis, for state-of-the-art silicon carbide (SiC) etching of vertical and bevelled structures by using inductively coupled plasma reactive ion etching (ICP-RIE) for microelectronic applications. Applying different gas mixtures, a maximum bevel angle of 87° (almost vertical), large-angle bevels ranging from 40° to 80°, and small-angel bevels ranging from 7° to 17° were achieved separately using distinct gas mixtures at different ratios...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28634111/levels-of-plasma-selenium-and-urinary-total-arsenic-interact-to-affect-the-risk-for-prostate-cancer
#20
Yu-Mei Hsueh, Chien-Tien Su, Horng-Sheng Shiue, Wei-Jen Chen, Yeong-Shiau Pu, Ying-Chin Lin, Cheng-Shiuan Tsai, Chao-Yuan Huang
This study investigated whether plasma selenium levels modified the risk for prostate cancer (PC) related to arsenic exposure. We conducted a case-control study that included 318 PC patients and 318 age-matched, healthy control subjects. Urinary arsenic profiles were examined using HPLC-HG-AAS and plasma selenium levels were measured by ICP-MS. We found that plasma selenium levels displayed a significant dose-dependent inverse association with PC. The odds ratio (OR) and 95% confidence interval (CI) for PC was 0...
June 17, 2017: Food and Chemical Toxicology
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