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https://www.readbyqxmd.com/read/28922508/single-oxidative-collision-events-of-silver-nanoparticles-understanding-the-rate-determining-chemistry
#1
Kamonwad Ngamchuea, Richard O D Clark, Stanislav V Sokolov, Neil P Young, Christopher Batchelor-McAuley, Richard G Compton
The oxidative dissolution of citrate-capped silver nanoparticles (AgNPs) is investigated herein by two electrochemical techniques: nano-impacts and anodic stripping voltammetry. Nano-impacts or single nanoparticle-electrode collisions allow the detection of individual nanoparticles. The technique offers an advantage over surface-immobilized methods such as anodic stripping voltammetry as it eliminates the effects of particle agglomeration/ aggregation. The electrochemical studies are performed in different electrolytes (KNO3, KCl, KBr and KI) at varied concentrations ( 20 mM)...
September 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28910079/silver-loaded-aluminosilicate-aerogels-as-iodine-sorbents
#2
Brian J Riley, Jared O Kroll, Jacob A Peterson, Josef Matyáš, Matthew J Olszta, Xiaohong Li, John D Vienna
In this paper, aluminosilicate aerogels were used as scaffolds for silver nanoparticles to capture I2(g). The starting materials for these scaffolds included Na-Al-Si-O and Al-Si-O aerogels, both synthesized from metal alkoxides. The Ag(0) particles were added by soaking the aerogels in aqueous AgNO3 solutions followed by drying and Ag(+) reduction under H2/Ar to form Ag(0) crystallites within the aerogel matrix. In some cases, aerogels were thiolated with 3-(mercaptopropyl)trimethoxysilane as an alternative method for binding Ag(+)...
September 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28894867/do-alkyl-groups-on-aromatic-or-aliphatic-structure-directing-agents-affect-water-stabilities-and-properties-of-hybrid-iodoargentates
#3
Guang-Ning Liu, Xu Zhang, Hong-Mei Wang, Hong Xu, Zi-Han Wang, Xiang-Long Meng, Ya-Nan Dong, Ruo-Yu Zhao, Cuncheng Li
Two types of in situ formed structure directing agents (SDAs) including aromatic triphenylphosphine (PPh3)- and aliphatic piperazine (H2pp)-derivative cations were used to synthesize five new hybrid iodoargentates, namely (EtPPh3)Ag3I4 (1, Et = ethyl), (n-PrPPh3)Ag3I4 (2, n-Pr = n-propyl), (i-PrPPh3)Ag5I6 (3, i-Pr = isopropyl), (Me4pp)0.5AgI2 (4, Me = methyl), and (H3app)2(Ag2I6)·2I·2H2O (5, app = N-aminoethylpiperazine). A comparative study of the two types of SDAs on the structures, stabilities and properties of hybrid iodoargentates was performed in detail...
September 12, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28886603/review-of-epidemiological-studies-of-drinking-water-turbidity-in-relation-to-acute-gastrointestinal-illness
#4
REVIEW
Anneclaire J De Roos, Patrick L Gurian, Lucy F Robinson, Arjita Rai, Issa Zakeri, Michelle C Kondo
BACKGROUND: Turbidity has been used as an indicator of microbiological contamination of drinking water in time-series studies attempting to discern the presence of waterborne gastrointestinal illness; however, the utility of turbidity as a proxy exposure measure has been questioned. OBJECTIVES: We conducted a review of epidemiological studies of the association between turbidity of drinking-water supplies and incidence of acute gastrointestinal illness (AGI), including a synthesis of the overall weight of evidence...
August 17, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28885976/quantitative-microbial-risk-assessment-for-spray-irrigation-of-dairy-manure-based-on-an-empirical-fate-and-transport-model
#5
Tucker R Burch, Susan K Spencer, Joel P Stokdyk, Burney A Kieke, Rebecca A Larson, Aaron D Firnstahl, Ana M Rule, Mark A Borchardt
BACKGROUND: Spray irrigation for land-applying livestock manure is increasing in the United States as farms become larger and economies of scale make manure irrigation affordable. Human health risks from exposure to zoonotic pathogens aerosolized during manure irrigation are not well understood. OBJECTIVES: We aimed to a) estimate human health risks due to aerosolized zoonotic pathogens downwind of spray-irrigated dairy manure; and b) determine which factors (e...
August 16, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28877172/automated-recording-of-home-cage-activity-and-temperature-of-individual-rats-housed-in-social-groups-the-rodent-big-brother-project
#6
William S Redfern, Karen Tse, Claire Grant, Amy Keerie, David J Simpson, John C Pedersen, Victoria Rimmer, Lauren Leslie, Stephanie K Klein, Natasha A Karp, Rowland Sillito, Agis Chartsias, Tim Lukins, James Heward, Catherine Vickers, Kathryn Chapman, J Douglas Armstrong
Measuring the activity and temperature of rats is commonly required in biomedical research. Conventional approaches necessitate single housing, which affects their behavior and wellbeing. We have used a subcutaneous radiofrequency identification (RFID) transponder to measure ambulatory activity and temperature of individual rats when group-housed in conventional, rack-mounted home cages. The transponder location and temperature is detected by a matrix of antennae in a baseplate under the cage. An infrared high-definition camera acquires side-view video of the cage and also enables automated detection of vertical activity...
2017: PloS One
https://www.readbyqxmd.com/read/28870388/the-optimal-timing-of-enteral-nutrition-and-its-effect-on-the-prognosis-of-acute-pancreatitis-a-propensity-score-matched-cohort-study
#7
Meng Jin, Huimin Zhang, Bo Lu, Yi Li, Dong Wu, Jiaming Qian, Hong Yang
BACKGROUND: Early enteral nutrition (EN) can improve the prognosis of acute pancreatitis (AP), but the optimal initiation time is unknown. In this study, the optimal time of early EN was analyzed to disclose the application of early EN in AP. METHODS: Data of 104 patients with AP were prospectively collected. With secondary infection (infected pancreatic necrosis and extrapancreatic infection) as the primary outcome variable, receiver operating characteristic (ROC) curve was used to calculate the optimal cut-off time of early EN...
September 1, 2017: Pancreatology: Official Journal of the International Association of Pancreatology (IAP) ... [et Al.]
https://www.readbyqxmd.com/read/28867763/utilization-of-fishery-processing-by-product-squid-pens-for-%C3%AE-glucosidase-inhibitors-production-by-paenibacillus-sp
#8
Van Bon Nguyen, Anh Dzung Nguyen, San-Lang Wang
The supernatants (the solution part received after centrifugation) of squid pens fermented by four species of Paenibacillus showed potent inhibitory activity against α-glucosidases derived from yeast (79-98%) and rats (76-83%). The inhibition of acarbose-a commercial antidiabetic drug, used against yeast and rat α-glucosidases-was tested for comparison; it showed inhibitory activity of 64% and 88%, respectively. Other chitinolytic or proteolytic enzyme-producing bacterial strains were also used to ferment squid pens, but no inhibition activity was detected from the supernatants...
August 30, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28847101/effect-of-public-transport-strikes-on-air-pollution-levels-in-barcelona-spain
#9
Xavier Basagaña, Margarita Triguero-Mas, David Agis, Noemí Pérez, Cristina Reche, Andrés Alastuey, Xavier Querol
Public transport strikes can lead to an increase of the number of private vehicle trips, which in turn can increase air pollution levels. We aimed to estimate the change in air pollution concentrations during public transport strikes in the city of Barcelona (Spain). Data on strikes of the metro, train or bus systems were collected from government records (2005-2016). We collected daily concentrations of NOx; particulate matter with an aerodynamic diameter smaller than 10μm (PM10), 2.5μm (PM2.5), and 1μm (PM1); particle number concentration (N); black carbon (BC) and CO from research and official monitoring stations...
August 23, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28839364/omega-3-fish-oil-reduces-mortality-due-to-severe-sepsis-with-acute-gastrointestinal-injury-grade-iii
#10
Huaisheng Chen, Wei Wang, Chengying Hong, Ming Zhang, Yingcai Hong, Su Wang, Huadong Zhang
BACKGROUND: Sepsis plays an important role in acute gastrointestinal injury (AGI). Our research was designed to determine the effects of omega-3 fish oil (FO) in patients suffering from severe sepsis combined with AGI III, and the ability of FO to modulate immune function. METHODS: Seventy-eight patients diagnosed with severe sepsis with AGI III and a need for mechanical ventilation were randomized to two groups. In the FO group, 50 g of long chain fatty acid soybean oil (n = 6) and 10 g of FO (n = 3) were administered as total parenteral nutrition (TPN)...
July 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28832824/-literary-biographic-and-autoethnographic-contributions-in-spanish-medical-anthropology-the-case-of-catalonia
#11
Elisa Alegre-Agís, Isabella Riccò
The autoethnographic method has been an important contribution to the development of medical anthropology in Spain. This article first reviews and explores documents published before 1980 that are usually classified as literature and autobiography and are linked to the health-disease-care process, a paradigmatic example of which is Ramona Via's diary Com neixen els Catalans [How Catalans are born] published in 1972. The second part of the article is focused on contributions carried out since the 1980s using the concept of autoethnography, which have as their object the body, health and illness based on a subjective ethnographic experience...
April 2017: Salud Colectiva
https://www.readbyqxmd.com/read/28805393/disappearance-of-the-superionic-phase-transition-in-sub-5-nm-silver-iodide-nanoparticles
#12
Takayuki Yamamoto, Hirokazu Kobayashi, Loku Singgappulige Rosantha Kumara, Osami Sakata, Kiyofumi Nitta, Tomoya Uruga, Hiroshi Kitagawa
Bulk silver iodide (AgI) is known to show a phase transition from the poorly conducting β/γ-phases into the superionic conducting α-phase at 147 °C. Its transition temperature decreases with decreasing the size of AgI, and the α-phase exists stably at 37 °C in AgI nanoparticles with a diameter of 6.3 nm. In this Letter, we investigated the atomic configuration, the phase transition behavior, and the ionic conductivity of AgI nanoparticles with a diameter of 3.0 nm. The combination of pair distribution function (PDF) analysis and reverse Monte Carlo (RMC) modeling based on high-energy X-ray diffraction (XRD) revealed for the first time that they formed the β/γ-phases with atomic disorder...
September 13, 2017: Nano Letters
https://www.readbyqxmd.com/read/28799343/the-surface-charge-distribution-affects-the-ice-nucleating-efficiency-of-silver-iodide
#13
Brittany Glatz, Sapna Sarupria
Heterogeneous ice nucleation is the primary pathway for ice formation. However, the detailed molecular mechanisms by which surfaces promote or hinder ice nucleation are not well understood. We present results from extensive molecular dynamics simulations of ice nucleation near modified silver iodide (AgI) surfaces. The AgI surfaces are modified to investigate the effects of the surface charge distribution on the rate of ice nucleation. We find that the surface charge distribution has significant effects on ice nucleation...
December 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28771145/waterborne-disease-outbreak-detection-an-integrated-approach-using-health-administrative-databases
#14
S Coly, N Vincent, E Vaissiere, M Charras-Garrido, A Gallay, C Ducrot, D Mouly
Hundreds of waterborne disease outbreaks (WBDO) of acute gastroenteritis (AGI) due to contaminated tap water are reported in developed countries each year. Such outbreaks are probably under-detected. The aim of our study was to develop an integrated approach to detect and study clusters of AGI in geographical areas with homogeneous exposure to drinking water. Data for the number of AGI cases are available at the municipality level while exposure to tap water depends on drinking water networks (DWN). These two geographical units do not systematically overlap...
August 2017: Journal of Water and Health
https://www.readbyqxmd.com/read/28768717/formin-2-links-neuropsychiatric-phenotypes-at-young-age-to-an-increased-risk-for-dementia
#15
Roberto Carlos Agís-Balboa, Paulo Pinhero, Nelson Rebola, Cemil Kerimoglu, Eva Benito, Michael Gertig, Sanaz Bahari-Javan, Gaurav Jain, Susanne Burkhardt, Ivana Delalle, Alexander Jatzko, Markus Dettenhofer, Patricia A Zunszain, Andrea Schmitt, Peter Falkai, Julius C Pape, Elisabeth B Binder, Christophe Mulle, Andre Fischer, Farahnaz Sananbenesi
Age-associated memory decline is due to variable combinations of genetic and environmental risk factors. How these risk factors interact to drive disease onset is currently unknown. Here we begin to elucidate the mechanisms by which post-traumatic stress disorder (PTSD) at a young age contributes to an increased risk to develop dementia at old age. We show that the actin nucleator Formin 2 (Fmn2) is deregulated in PTSD and in Alzheimer's disease (AD) patients. Young mice lacking the Fmn2 gene exhibit PTSD-like phenotypes and corresponding impairments of synaptic plasticity, while the consolidation of new memories is unaffected...
August 2, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28762424/low-temperature-conductivity-and-ion-dynamics-in-silver-iodide-silver-metaphosphate-glasses
#16
Layla Badr
Silver iodide-silver metaphosphate glasses xAgI·(1 - x)AgPO3 (x = 0.3, 0.4, and 0.5) have been prepared using the usual melt quenching method. Differential scanning calorimetry has been used to determine the glass transition temperature of the samples. Impedance spectroscopy spanning wide temperature (20 K to 200 K) and frequency (10(-1) Hz to 10(6) Hz) ranges has been employed to investigate the ion dynamics. At high temperatures, below the glass transition temperature and down to around 120 K, the dynamics show the usual behavior of dc and dispersed conductivity due to the random and correlated motion of the ions...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28745232/in-vitro-%C3%AE-glucosidase-inhibition-by-non-sugar-based-triazoles-of-dibenzoazepine-their-structure-activity-relationship-and-molecular-docking
#17
Maria A Khan, Kulsoom Javaid, Abdul Wadood, Alam Jamal, Farhana Batool, Saba Fazal-Ur-Rehman, Fatima Z Basha, M Iqbal Choudhary
BACKGROUND: α-Glucosidase inhibitors (AGIs) have been reported for their clinical potential against postprandial hyperglycemia, which is responsible for risks associated with diabetes mellitus 2 and cardiovascular diseases (CVDs). Besides, a number of compounds have been reported as potent AGIs, several side effects are associated with them. METHODS: The aim of present work is to explore new and potent molecules as AGIs. Therefore, a library of dibenzoazepine linked triazoles (1-15) was studied for their in vitro α-glucosidase inhibitory activity...
July 26, 2017: Medicinal Chemistry
https://www.readbyqxmd.com/read/28725274/news-in-al-amyloidosis-ash-2016-a%C3%A2-rapidly-evolving-field-of-investigation
#18
REVIEW
Hermine Agis
Amyloidosis is a rare but life-threatening protein misfolding disease. The early diagnosis and enrollment of patients into multicentre trials is of great importance, as is the need for intensive collaboration between multiple medical departments and experienced specialists. In the following review, the most interesting abstracts from the annual American Society of Hematology (ASH) meeting in 2016 are presented. The topics include the limitations of established biomarkers in risk assessment and response evaluation, the introduction of a new biomarker, the comparison of different treatment sequences and the efficacy of a multiple drug regimen in light-chain (AL) amyloidosis...
2017: Memo
https://www.readbyqxmd.com/read/28723559/kmt2a-and-kmt2b-mediate-memory-function-by-affecting-distinct-genomic-regions
#19
Cemil Kerimoglu, M Sadman Sakib, Gaurav Jain, Eva Benito, Susanne Burkhardt, Vincenzo Capece, Lalit Kaurani, Rashi Halder, Roberto Carlos Agís-Balboa, Roman Stilling, Hendrik Urbanke, Andrea Kranz, A Francis Stewart, Andre Fischer
Kmt2a and Kmt2b are H3K4 methyltransferases of the Set1/Trithorax class. We have recently shown the importance of Kmt2b for learning and memory. Here, we report that Kmt2a is also important in memory formation. We compare the decrease in H3K4 methylation and de-regulation of gene expression in hippocampal neurons of mice with knockdown of either Kmt2a or Kmt2b. Kmt2a and Kmt2b control largely distinct genomic regions and different molecular pathways linked to neuronal plasticity. Finally, we show that the decrease in H3K4 methylation resulting from Kmt2a knockdown partially recapitulates the pattern previously reported in CK-p25 mice, a model for neurodegeneration and memory impairment...
July 18, 2017: Cell Reports
https://www.readbyqxmd.com/read/28709443/severity-of-acute-gastrointestinal-injury-grade-is-a-predictor-of-all-cause-mortality-in-critically-ill-patients-a-multicenter-prospective-observational-study
#20
Bangchuan Hu, Renhua Sun, Aiping Wu, Yin Ni, Jingquan Liu, Feng Guo, Lijun Ying, Guoping Ge, Aijun Ding, Yunchao Shi, Changwen Liu, Lei Xu, Ronglin Jiang, Jun Lu, Ronghai Lin, Yannan Zhu, Weidong Wu, Bo Xie
BACKGROUND: In 2012, the European Society of Intensive Care Medicine proposed a definition for acute gastrointestinal injury (AGI) based on current medical evidence and expert opinion. The aim of the present study was to evaluate the feasibility of using the current AGI grading system and to investigate the association between AGI severity grades with clinical outcome in critically ill patients. METHODS: Adult patients at 14 general intensive care units (ICUs) with an expected ICU stay ≥24 h were prospectively studied...
July 14, 2017: Critical Care: the Official Journal of the Critical Care Forum
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