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https://www.readbyqxmd.com/read/28926710/structure-vibrational-frequencies-and-bond-energies-of-the-brhgox-and-brhgxo-species-formed-in-atmospheric-mercury-depletion-events
#1
Yuge Jiao, Theodore Simon Dibble
Photochemistry during the polar Spring leads to atmospheric mercury depletion events (AMDEs): Hg(0), which typically lives for months in the atmosphere, can experience losses of more than 90% in less than a day. These dramatic losses are known to be initiated largely by Br + Hg + M → BrHg• + M, but the fate of BrHg• is a matter of guesswork. It is believed that BrHg• largely reacts with halogen oxides, XO (X = Cl, Br, and I) to form BrHgOX compounds, but these species have never been studied experimentally...
September 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28926707/medieval-gilding-technology-of-historical-metal-threads-revealed-by-electron-optical-and-micro-raman-spectroscopic-study-of-focused-ion-beam-milled-cross-sections
#2
Tamás Gábor Weiszburg, Katalin Gherdán, Kitti Ratter, Norbert Zajzon, Zsolt Bendő, György Z Radnoczi, Ágnes Takács, Tamás Váczi, Gábor Varga, György Szakmány
Although gilt silver threads were widely used for decorating historical textiles, their manufacturing techniques have been elusive for centuries. Contemporary written sources give only limited, sometimes ambiguous information, and detailed cross-sectional study of the microscale soft noble metal objects has been hindered by sample preparation. In this work, to give a thorough characterization of historical gilt silver threads, nano- and microscale textural, chemical and structural data on cross sections, prepared by focused ion beam milling, were collected, using various electron-optical methods (high-resolution scanning electron microscopy (SEM), wavelength-dispersive electron probe microanalysis (EPMA), electron back-scattered diffraction (EBSD) combined with energy-dispersive electron probe microanalysis (EDX), transmission electron microscopy (TEM) combined with EDX, and micro-Raman spectroscopy...
September 19, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28926362/validation-of-the-pangao-pg-800a36-automatic-wrist-blood-pressure-monitor-according-to-the-european-society-of-hypertension-and-the-british-hypertension-society-protocols
#3
Hairong Zhao, Weichang Qiao, Rui Zhang, Peng Cui, Fanglin Hou, Wenli Zhang
OBJECTIVE: The aim of this study was to validate the PG-800A36 automatic wrist blood pressure monitor according to the European Society of Hypertension International Protocol (ESH-IP) revision 2010 and the British Hypertension Society (BHS) protocols. PARTICIPANTS AND METHODS: A total of 33 participants were initially included on the basis of the ESH-IP, followed by examination of 85 participants according to the BHS protocol. The procedures and analysis methods of the protocols were followed precisely with left arm/wrist sequential measurements by two trained observers using a mercury sphygmomanometer and one supervisor using the device...
September 18, 2017: Blood Pressure Monitoring
https://www.readbyqxmd.com/read/28926123/isotopic-and-chemical-characteristics-of-mercury-in-organs-and-tissues-of-fish-in-a-mercury-polluted-lake-evidence-for-fractionation-of-mercury-isotopes-by-physiological-processes
#4
Togwell A Jackson
Organs and tissues of whitefish and trout from mercury (Hg)-polluted Lake Ontario were analysed for Hg isotopes, methylmercury (CH3 Hg(+) ), and inorganic Hg to investigate possible mass-dependent fractionation (MDF) and mass-independent fractionation (MIF) of Hg isotopes by physiological processes of the fish. Isotope signatures of different body parts were defined by δ-values of (198) Hg/(202) Hg, (199) Hg/(202) Hg, (200) Hg/(202) Hg, and (201) Hg/(202) Hg ratios and by Δ-values representing effects of MIF on (199) Hg/(202) Hg and (201) Hg/(202) Hg ratios...
September 19, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28925704/ict-isomerization-induced-turn-on-fluorescence-probe-with-a-large-emission-shift-for-mercury-ion-application-in-combinational-molecular-logic
#5
Sushil Ranjan Bhatta, Bijan Mondal, Gonela Vijaykumar, Arunabha Thakur
A unique turn-on fluorescent device based on a ferrocene-aminonaphtholate derivative specific for Hg(2+) cation was developed. Upon binding with Hg(2+) ion, the probe shows a dramatic fluorescence enhancement (the fluorescence quantum yield increases 58-fold) along with a large red shift of 68 nm in the emission spectrum. The fluorescence enhancement with a red shift may be ascribed to the combinational effect of C═N isomerization and an extended intramolecular charge transfer (ICT) mechanism. The response was instantaneous with a detection limit of 2...
September 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28924267/burnout-among-gynaecological-residents-in-lahore-pakistan-a-cross-sectional-survey
#6
Khadija Waheed, Naeem Liaqat, Amna Khanum, Sara Ejaz, Shamila Ijaz, Ambreen Butt, Fawad Ahmed Randhawa, Iffat Naheed, Salman Javed
OBJECTIVE: To determine the prevalence of burnout among gynaecological residents and factors associated with it. METHODS: This cross-sectional study was performed at the University Medical and Dental College, Faisalabad, Pakistan, from March to April 2016, and comprised female medical students. Participants were divided into groups on the basis of their ABO blood groups and on body mass index criteria. Blood groups were determined by simple conventional slide method...
September 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28923342/total-mercury-concentrations-in-liver-and-muscle-of-european-whitefish-coregonus-lavaretus-l-in-a-subarctic-lake-assessing-the-factors-driving-year-round-variation
#7
Ossi Keva, Brian Hayden, Chris Harrod, Kimmo K Kahilainen
Subarctic lakes are characterised by extreme seasonal variation in light and temperature which influences growth, maturation, condition and resource use of fishes. However, our understanding of how seasonal changes affect mercury concentrations of fishes is limited. We conducted a year-round study (3 ice-covered months, 3 open-water months) with open-water inter-annual aspect (3 years: samples from August/September), focusing on total mercury (THg) concentrations and ecological characteristics of a common freshwater fish, European whitefish (Coregonus lavaretus (L...
September 16, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28922657/methods-employed-in-cytofluorometric-assessment-of-eryptosis-the-suicidal-erythrocyte-death
#8
Mohamed Jemaà, Myriam Fezai, Rosi Bissinger, Florian Lang
Suicidal erythrocyte death or eryptosis contributes to or even accounts for anemia in a wide variety of clinical conditions, such as iron deficiency, dehydration, hyperphosphatemia, vitamin D excess, chronic kidney disease (CKD), hemolytic-uremic syndrome, diabetes, hepatic failure, malignancy, arteriitis, sepsis, fever, malaria, sickle-cell disease, beta-thalassemia, Hb-C and G6PD-deficiency, Wilsons disease, as well as advanced age. Moreover, eryptosis is triggered by a myriad of xenobiotics and endogenous substances including cytotoxic drugs and uremic toxins...
September 1, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28921305/allocation-of-metals-and-trace-elements-in-different-tissues-of-piscivorous-species-phalacrocorax-carbo
#9
Hribšek Irena, Jovičić Katarina, Karadžić Branko, Skorić Stefan
Great cormorants (Phalacrocorax carbo) are piscivorous birds, and as apex predators they accumulate high levels of contaminants from the aquatic ecosystems. In the present study, we analyzed distribution of Al, Cd, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Sr, and Zn in ten tissues (muscle, liver, kidney, spleen, gizzard, heart, skin, lard, breast feathers, and remiges) of the Great cormorants in the Marin Sprud locality, the Danube River, Serbia. Concentrations of elements in tissues were assessed by using inductively coupled plasma optical spectrometry...
September 18, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28920782/evaluation-of-lead-and-mercury-prevalence-in-bald-eagles-haliaeetus-leucocephalus-from-the-mid-atlantic-united-states
#10
Andreas Eleftheriou, Lisa Murphy, Sallie Welte
Heavy metal contamination of the environment remains a critical issue. Lead and mercury exposure, particularly, can affect avian health. Bald eagles (Haliaeetus leucocephalus) ingest these metals through their diets. Lead and mercury prevalence were examined in bald eagles from three mid-Atlantic US states between 2004 and 2013. Blood samples were analyzed using atomic absorption spectrometry. Wilcoxon score tests were used to detect differences in lead and mercury over time. Counties of origin for birds with clinically significant metal levels were identified...
September 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28920689/a-320-year-ice-core-record-of-atmospheric-hg-pollution-in-the-altai-central-asia
#11
Stella Eyrikh, Anja Eichler, Leonhard Tobler, Natalia Malygina, Tatyana Papina, Margit Schwikowski
Anthropogenic emissions of the toxic heavy metal mercury (Hg) have substantially increased atmospheric Hg levels during the 20th century compared to pre-industrial times. However, on a regional scale, atmospheric Hg concentration or deposition trends vary to such an extent during the industrial period that the consequences of recent Asian emissions on atmospheric Hg levels are still unclear. Here we present a 320-year Hg deposition history for Central Asia, based on a continuous high-resolution ice-core Hg record from the Belukha glacier in the Siberian Altai, covering the time period 1680-2001...
September 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28918278/heavy-metals-as-hg-and-v-and-stable-isotope-ratios-%C3%AE-13-c-and-%C3%AE-15-n-in-fish-from-yellow-river-estuary-china
#12
Yuan Liu, Guijian Liu, Zijiao Yuan, Houqi Liu, Paul K S Lam
The Yellow River Estuary is a significant fishery, but at present there are few studies about the concentrations of arsenic (As), mercury (Hg) and vanadium (V) in fish from this area, which might cause potential health risk to fish consumers. The aim of this study was to research on the accumulation and potential sources of heavy metals in the fish of the Yellow River Estuary. Arsenic, Hg, V and stable isotope ratios (δ(15)N and δ(13)C) in 11 species of 129 fish were analyzed. Results showed that the concentrations of As and Hg were all lower than the guideline levels established by international organizations and legal limits by several countries...
September 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28918247/erato-polymnioides-a-novel-hg-hyperaccumulator-plant-in-ecuadorian-rainforest-acid-soils-with-potential-of-microbe-associated-phytoremediation
#13
Irene Chamba, Daniel Rosado, Carolina Kalinhoff, Selvaraj Thangaswamy, Aminael Sánchez-Rodríguez, Manuel Jesús Gazquez
Mercury (Hg) accumulation capacity was assessed in three plant species (Axonopus compressus, Erato polymnioides, and Miconia zamorensis) that grow on soils polluted by artisanal small-scale gold mines in the Ecuadorian rainforest. Individuals of three species were collected at two sampling zones: i) an intensive zone (IZ, 4.8 mg Hg kg(-1) of soil) where gold extraction continues to occur, and ii) a natural zone (NZ, 0.19 mg Hg kg(-1) of soil). In addition, the percentage of arbuscular mycorrhizal fungi (AMF) colonization was determined in plant roots and seven fungal morphotypes isolated from rhizospheric soil...
August 30, 2017: Chemosphere
https://www.readbyqxmd.com/read/28917808/single-drop-gold-nanoparticles-for-headspace-microextraction-and-colorimetric-assay-of-mercury-ii-in-environmental-waters
#14
Tesfaye Tolessa, Zhi-Qiang Tan, Yong-Guang Yin, Jing-Fu Liu
A novel headspace colorimetric nanosensor strategy for specific detection of Hg(II) was developed based upon analyte induced etching and amalgamation of gold nanoparticles (AuNPs). The Hg(II) was first selectively reduced to its volatile form, Hg(0), by stannous chloride (SnCl2) through chemical cold vapor generation (CVG) reaction. Then, the Hg(0) was headspace extracted into 37μL thioglycolic acid functionalized AuNP aqueous suspension containing 10% methanol as extractant and simultaneously reacted with AuNPs through the strong metallophilic Hg-Au interaction, resulting in a red-to-blue color change...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917728/fast-method-for-the-simultaneous-determination-of-monomethylmercury-and-inorganic-mercury-in-rice-and-aquatic-plants
#15
María Jiménez-Moreno, Miguel Ángel Lominchar, María José Sierra, Rocío Millán, Rosa Carmen Rodríguez Martín-Doimeadios
Recent investigations revealed that monomethylmercury (MMHg) can be absorbed and accumulated by plants, i.e. rice crops, thus becoming an important route of human exposure to MMHg through diet. The increasing concern about this fact makes that appropriate analytical methods for Hg speciation in these samples are urgently required. Therefore, the aim of this work has been the development of a fast and sensitive method which enables the simultaneous determination of MMHg and inorganic Hg in rice and aquatic plants...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917711/crocodiles-and-alligators-antiamoebic-and-antitumor-compounds-of-crocodiles
#16
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/28915375/the-presence-of-mercury-and-other-trace-metals-in-surface-soils-in-the-norwegian-arctic
#17
Katharina Halbach, Øyvind Mikkelsen, Torunn Berg, Eiliv Steinnes
Svalbard is an important study area for investigating the long-range transport of mercury (Hg) and other trace elements to the Arctic. Few studies have focused on their concentrations in Arctic soils. With ongoing climate change leading to thawing permafrost ground the soil compartment is of increasing importance in the Arctic. In this study, elemental composition and soil organic matter (SOM) content of surface and mineral soils in Svalbard are presented. The aim is to provide new data on soils in the Arctic and to gain more knowledge about the role of the soil in the biogeochemical cycle of mercury (Hg)...
September 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28914183/enhancing-mercury-removal-across-air-pollution-control-devices-for-coal-fired-power-plants-by-desulfurization-wastewater-evaporation
#18
Hu Bin, Yi Yang, Liang Cai, Yang Linjun, Szczepan Roszak
Desulfurization wastewater evaporation technology is used to enhance the removal of gaseous mercury (Hg) in conventional air pollution control devices (APCDs) for coal-fired power plants. It had been studied that gaseous Hg is oxidized and removed by selective catalytic reduction (SCR), an electrostatic precipitator (ESP) and a wet flue gas desulfurization (WFGD) in coal-fired thermal experiment platform with WFGD wastewater evaporation. Effects of desulfurization wastewater evaporation position, evaporation temperature, and chlorine ion concentration on Hg oxidation were studied as well...
September 15, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28910083/inhibiting-mercury-reemission-and-enhancing-magnesia-recovery-by-cobalt-loaded-carbon-nanotubes-in-a-novel-magnesia-desulfurization-process
#19
Lidong Wang, Tieyue Qi, Mengxuan Hu, Shihan Zhang, Peiyao Xu, Dan Qi, Siyu Wu, Huining Xiao
Mercury re-emission because of the reduction of Hg2+ to form Hg0 by sulfite has been becoming a great concern in the desulfurization process. Lowering down the concentrations of Hg2+ and sulfite in the desulfurization slurry can retard the Hg0 formation and thus mitigate the mercury re-emission. To that end, cobalt-based carbon nanotubes (Co-CNTs) were developed for the simultaneous Hg2+ removal and sulfite oxidation in this work. Furthermore, the thermodynamics and kinetics of the Hg2+ adsorption and effect of Hg2+ adsorption on catalytic activity of Co-CNTs were investigated...
September 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28906538/nuclear-cardiology-practices-and-radiation-exposure-in-africa-results-from-the-iaea-nuclear-cardiology-protocols-study-incaps
#20
Salah E Bouyoucef, Mathew Mercuri, Thomas N Pascual, Adel H Allam, Mboyo Vangu, João V Vitola, Nathan Better, Ganesan Karthikeyan, John J Mahmarian, Madan M Rehani, Ravi Kashyap, Maurizio Dondi, Diana Paez, Andrew J Einstein
OBJECTIVE: While nuclear myocardial perfusion imaging (MPI) offers many benefits to patients with known or suspected cardiovascular disease, concerns exist regarding radiation-associated health effects. Little is known regarding MPI practice in Africa. We sought to characterise radiation doses and the use of MPI best practices that could minimise radiation in African nuclear cardiology laboratories, and compare these to practice worldwide. METHODS: Demographics and clinical characteristics were collected for a consecutive sample of 348 patients from 12 laboratories in six African countries over a one-week period from March to April 2013...
July 2017: Cardiovascular Journal of Africa
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