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https://www.readbyqxmd.com/read/29793108/manganese-contamination-affects-the-motor-performance-of-wild-northern-quolls-dasyurus-hallucatus
#1
Ami Fadhillah Amir Abdul Nasir, Skye F Cameron, Amanda C Niehaus, Christofer J Clemente, Frank A von Hippel, Robbie S Wilson
Neuromotor deficits are an important sign of manganese (Mn) toxicity in humans and laboratory animals. However, the impacts of Mn exposure on the motor function of wild animals remains largely unknown. Here, we assessed the impact of chronic exposure to Mn from active mining operations on Groote Eylandt, Australia on the motor function of the semi-arboreal northern quoll (Dasyurus hallucatus), an endangered species. The three motor tests conducted-maximum sprint speed on a straight run, manoeuvrability around a corner, and motor control on a balance beam-showed that elevated Mn body burden did not diminish performance of these traits...
May 21, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29792553/mitochondrial-complex-i-defect-resulting-from-exercise-induced-lower-limb-ischemia-in-patients-with-peripheral-arterial-disease
#2
Isabelle Signolet, Pierre Abraham, Stéphanie Chupin, Myriam Ammi, Naïg Gueguen, Franck Letournel, Jean Picquet, Christophe Baufreton, Mickael Daligault, Vincent Procaccio, Pascal Reynier, Samir Henni
OBJECTIVE: This study aims to compare the structural and mitochondrial alterations between muscle segments affected by exercise-induced ischemia and segments of the same muscle without ischemia, in the same subject. METHODS: In a prospective analysis, 34 patients presenting either peripheral arterial disease or chronic coronary syndrome without any evidence of peripheral arterial disease were eligible for inclusion based on findings indicating a need for either a femoro-popliteal bypass or a saphenous harvesting for coronary bypass...
May 24, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29792530/manganese-transport-and-toxicity-in-polarized-wif-b-hepatocytes
#3
Khristy J Thompson, Jennifer Hein, Andrew Baez, Jose Carlo Sosa, Marianne Wessling-Resnick
Mn toxicity arises from nutritional problems, community and occupational exposures, and genetic risks. Mn blood levels are controlled by hepatobiliary clearance. The goals of this study were to determine the cellular distribution of Mn transporters in polarized hepatocytes, to establish an in vitro assay for hepatocyte Mn efflux, and to examine possible roles the Mn transporters would play in metal import and export. For these experiments, hepatocytoma WIF-B cells were grown for 12-14 days to achieve maximal polarity...
May 24, 2018: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29792324/photochemical-formation-and-transformation-of-birnessite-effects-of-cations-on-micromorphology-and-crystal-structure
#4
Tengfei Zhang, Lihu Liu, WenFeng Tan, Steven L Suib, Guohong Qiu, Fan Liu
As important components with excellent oxidation and adsorption activity in soils and sediments, manganese oxides affect the transportation and fate of nutrients and pollutants in natural environments. In this work, birnessite was formed by photocatalytic oxidation of Mn2+aq in the presence of nitrate under solar irradiation. The effects of concentrations and species of interlayer cations (Na+, Mg2+, and K+) on birnessite crystal structure and micromorphology were investigated. The roles of adsorbed Mn2+ and pH in the transformation of the photosynthetic birnessite were further studied...
May 24, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29791811/the-putative-transient-receptor-potential-trp-channel-protein-encoded-by-the-orf19-4805-is-involved-in-cation-sensitivity-antifungal-tolerance-and-filamentation-in-candida-albicans
#5
Linghuo Jiang, Yi Yang
The ancient family of cation channels, transient receptor potential (TRP) channels, is highly conserved in eukaryotes and plays various physiological functions from sensation of ion homeostasis to reception of pain and vision. Calcium-permeable TRP channels have been identified from the plant Arabidopsis thaliana (AtCsc1) and the budding yeast Saccharomyces cerevisiae (ScCsc1), respectively. In this study, we have characterized the functions of the Csc1 homolog, the orf19.4805, in Candida albicans. The orf19...
May 23, 2018: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/29791162/manganese-catalyzed-direct-conversion-of-ester-to-amide-with-liberation-of-h-2
#6
Akash Mondal, Murugan Subaramanian, Avanashiappan Nandakumar, Ekambaram Balaraman
A simple and efficient Mn-catalyzed acylation of amines is achieved using both acyl and alkoxy functions of unactivated esters with the liberation of molecular hydrogen as a sole byproduct. The present protocol provides an atom-economical and sustainable route for the synthesis of amides from esters by employing an earth-abundant manganese salt and inexpensive phosphine-free tridentate ligand.
May 23, 2018: Organic Letters
https://www.readbyqxmd.com/read/29788779/elevated-serum-lipid-peroxidation-and-reduced-vitamin-c-and-trace-element-concentrations-are-correlated-with-epilepsy
#7
Abhijit Das, Md Shahid Sarwar, Md Shohel Hossain, Palash Karmakar, Mohammad Safiqul Islam, Mohammad Enayet Hussain, Sujan Banik
BACKGROUND: Epilepsy is one of the chronic and heterogeneous epidemic neurological disorders leading to substantial mortality. The aim of the present study was to investigate the serum levels of malondialdehyde (MDA), vitamin C, and trace elements namely zinc (Zn), copper (Cu), and manganese (Mn) in epileptic patients of Bangladesh and to establish if there are any pathophysiological correlations. METHODS: This was a case-control study with 40 generalized epileptic patients and 40 healthy subjects as controls...
May 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29788199/influences-of-trace-mineral-nutrition-and-maternal-flock-age-on-broiler-embryo-bone-development
#8
C A Torres, D R Korver
At hatch, the chick skeleton is a miniature of that of the adult bird. The hen deposits calcium, phosphorus, and trace minerals (copper, zinc, and manganese) along with vitamin D into the egg to allow development of the embryonic skeleton. The main source of calcium is the eggshell, whereas phosphorus, trace minerals, and vitamin D are mainly derived from the yolk. Calcium is absorbed from the eggshell and transferred to the embryo and yolk through the chorioallantoic membrane, whereas phosphorus and trace minerals are simultaneously mobilized by the yolk sac membrane...
May 21, 2018: Poultry Science
https://www.readbyqxmd.com/read/29786429/development-of-a-nanostructured-%C3%AE-mno2-carbon-paper-composite-for-removal-of-ni2-mn2-ions-by-electrosorption
#9
Pengju Li, Yang Gui, Daniel John Blackwood
Toxic metal ions, such as Ni2+ and Mn2+, in industrial waste streams are non-biodegradable and can cause damage to the human body. Electrochemical cleaning techniques are attractive as they offer more control and produce less sludge than chemical / biological approaches without the high pressures needed for membranes. Here nanoneedle structured α-MnO2/carbon fiber paper (CFP) composites were synthesized by a hydrothermal approach and used as electrodes for combined electro-adsorption and capacitive deionization removal of nickel and manganese ions from pseudo industrial waste streams...
May 22, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29785905/hepatic-sirt3-expression-declines-postpartum-in-dairy-goats
#10
Lei Liu, Li Yao, Tao Peng, Lixin Wen, Wenjie Cai, Xinglin Jia, Jianhua He
The experiments reported in this research communication aimed to plot the expression pattern of Sirt3, a master regulator of energy metabolism and antioxidation defence, in the liver of dairy goats during perinatal period. Ten healthy dairy goats in late pregnancy were chosen, and needle biopsy was applied to collect liver samples at 1-week intervals. Protein levels of hepatic Sirt3 were analysed by western-blotting. Serum enzyme activities of manganese superoxide dismutase (Mn-SOD) and non-esterified fatty acids (NEFA) levels were measured, and their correlation with Sirt3 mRNA levels was also estimated...
May 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/29785603/trace-and-macro-elements-in-the-femoral-bone-as-indicators-of-long-term-environmental-exposure-to-toxic-metals-in-european-brown-bear-ursus-arctos-from-croatia
#11
Maja Lazarus, Tatjana Orct, Slaven Reljić, Marija Sedak, Nina Bilandžić, Jasna Jurasović, Đuro Huber
We explored the long-term accumulation of aluminium, strontium, cadmium and lead in the compact and trabecular bone of the femoral epiphysis, metaphysis and diaphysis in 41 brown bears (Ursus arctos) from Croatia. Also, we assessed their influence on macro and trace elements (sodium, magnesium, phosphorus, potassium, calcium, manganese, iron, cobalt, copper, zinc and barium) in bears' bone. There were no sex differences in element levels in general, while age was associated with bone length and levels of all elements, except for cadmium...
May 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29785595/a-preliminary-investigation-on-water-quality-of-coalbed-natural-gas-produced-water-for-beneficial-uses-a-case-study-in-the-southern-qinshui-basin-north-china
#12
Zheng Zhang, Yong Qin
Coalbed natural gas (CBNG) is an important unconventional natural gas resource with large reserves in China and receives much attention these years. The CBNG production is accomplished by extracting large volumes of produced water from the aquifer. The CBNG-produced water is commonly managed by discharging into nearby disposal ponds in the Southern Qinshui Basin (SQB), which provides an opportunity for water source for nearby irrigation, livestock, wildlife, and human drinking water. However, utilization of this nontraditional water source in the SQB is hindered by limited knowledge of water quality, practically oxidation/reduction potential (OPR), electrical conductivity (EC), sodium adsorption ration (SAR), and trace element chemistry data...
May 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29784802/electrochemical-trapping-of-metastable-mn-3-ions-for-activation-of-mno-2-oxygen-evolution-catalysts
#13
Zamyla Morgan Chan, Daniil A Kitchaev, Johanna Nelson Weker, Christoph Schnedermann, Kipil Lim, Gerbrand Ceder, William Tumas, Michael F Toney, Daniel G Nocera
Electrodeposited manganese oxide films are promising catalysts for promoting the oxygen evolution reaction (OER), especially in acidic solutions. The activity of these catalysts is known to be enhanced by the introduction of Mn3+ We present in situ electrochemical and X-ray absorption spectroscopic studies, which reveal that Mn3+ may be introduced into MnO2 by an electrochemically induced comproportionation reaction with Mn2+ and that Mn3+ persists in OER active films. Extended X-ray absorption fine structure (EXAFS) spectra of the Mn3+ -activated films indicate a decrease in the Mn-O coordination number, and Raman microspectroscopy reveals the presence of distorted Mn-O environments...
May 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29784343/facile-synthesis-of-ni-based-metal-organic-frameworks-wrapped-mno-2-nanowires-with-high-performance-toward-electrochemical-oxygen-evolution-reaction
#14
Yujie Han, You Yu, Lingling Zhang, Liang Huang, Junfeng Zhai, Shaojun Dong
The transition metal oxides based catalysts have drawn great attention for their application in the electrolysis of water for renewable energy generation. Although manganese oxides were rarely used as oxygen evolution reaction (OER) catalysts, they were still considered as active and efficient OER catalysts due to the earth-abundant and low toxic nature of manganese. In this work, we proposed a facile method for the synthesis of high-performance electrochemical OER catalyst by magnetically stirring the mixture of 1,3,4-thiadiazole-2,5-dithiol (DMTD), Ni2+ and MnO2 nanowires (NWs) in ethanol at room temperature, noted as Ni/DMTD/MnO2 ...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784303/simple-icp-oes-based-method-for-determination-of-selected-elements-in-brewed-ground-and-soluble-coffees-prior-to-evaluation-of-their-intake-and-chemical-fractionation
#15
Pawel Pohl, Anna Szymczycha-Madeja, Maja Welna
A simple method of simultaneous determination of aluminum (Al), barium (Ba), calcium (Ca), copper (Cu), iron (Fe), magnesium (Mg), manganese (Mn), nickel (Ni), strontium (Sr) and zinc (Zn) in brews of ground and soluble coffees was proposed. It relied on acidification of brews with HNO3 to 1.3 mol L-1 and their analysis by inductively coupled plasma optical emission spectrometry. Precision of 0.1-9% and detection limits from 0.07 ng mL-1 (Sr) to 3 ng mL-1 (Ni) were achieved. Trueness of the method was verified by comparison of results with those achieved with wet digestion and by the recovery study, and was better than 5%...
October 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29784017/investigating-aquifer-contamination-and-groundwater-quality-in-eastern-terai-region-of-nepal
#16
Sanjay Mahato, Asmita Mahato, Pankaj Kumar Karna, Nisha Balmiki
OBJECTIVE: This study aims at assessing the groundwater quality of the three districts of Eastern Terai region of Nepal viz. Morang, Jhapa, Sunsari using physicochemical characteristics and statistical approach so that possible contamination of water reservoir can be understood. pH, temperature, conductivity, turbidity, color, total dissolved solids, fluorides, ammonia, nitrates, chloride, total hardness, calcium hardness, calcium, magnesium, total alkalinity, iron, manganese, arsenic have to be analyzed to know the present status of groundwater quality...
May 21, 2018: BMC Research Notes
https://www.readbyqxmd.com/read/29783625/a-simple-alternative-method-for-preservation-of-2-methylisoborneol-in-water-samples
#17
Chun-Cheng Fan, Yi-Ting Chiu, Tsair-Fuh Lin
2-Methylisoborneol (2-MIB) is one of the most commonly observed taste and odor (T&O) compounds present in drinking water sources. As it is biodegradable, a preservation agent, typically mercury chloride, is needed if the water is not analyzed right after sampling. Since mercury is a toxic metal, an alternative chemical that is cheaper and less toxic is desirable. In this study, two chemicals commonly used in water treatment processes, chlorine (as sodium hypochlorite) and KMnO₄ (potassium permanganate), are studied to determine their feasibility as preservation agents for 2-MIB in water...
May 18, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29783045/factors-affecting-gene-expression-and-activity-of-heme-and-manganese-dependent-catalases-in-lactobacillus-casei-strains
#18
Annamaria Ricciardi, Rocco Gerardo Ianniello, Eugenio Parente, Teresa Zotta
Catalases reduce oxidative stress by degrading hydrogen peroxide to molecular oxygen and water. The presence of heme-dependent or manganese-dependent catalases was observed for a long time in lactic acid bacteria (LAB) but, to date, knowledge on the factors affecting gene expression and enzymatic functionality are limited to a very few strains. In this study, the effect of atmosphere of incubation (not aerated static growth vs aerated shaken growth) and supplementation with Fe2+ , hemin, Mn2+ or their combinations on the catalase production of respiration-competent strain Lactobacillus casei N87 was evaluated using a 24 factorial design...
May 8, 2018: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29782032/leaf-associated-bacterial-microbiota-of-coffee-and-its-correlation-with-manganese-and-calcium-levels-on-leaves
#19
Leandro Pio de de Sousa, Marcio José da da Silva, Jorge Maurício Mondego
Coffee is one of the most valuable agricultural commodities and the plants' leaves are the primary site of infection for most coffee diseases, such as the devastating coffee leaf rust. Therefore, the use of bacterial microbiota that inhabits coffee leaves to fight infections could be an alternative agricultural method to protect against coffee diseases. Here, we report the leaf-associated bacteria in three coffee genotypes over the course of a year, with the aim to determine the diversity of bacterial microbiota...
May 17, 2018: Genetics and Molecular Biology
https://www.readbyqxmd.com/read/29781172/manganese-catalyzed-hydrosilylation-reactions
#20
Congyang Wang, Xiaoxu Yang
In the past few decades, manganese-catalyzed hydrosilylation of C=O or C=C/C≡C unsaturated bonds achieved enormous developments. In this focus review, the hydrosilylation reactions of alkene, alkyne and carbonyl-containing substrates catalyzed by manganese complexes, are summarized. Moreover, the mechanisms of manganese-catalyzed hydrosilylation are discussed briefly.
May 20, 2018: Chemistry, An Asian Journal
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