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https://www.readbyqxmd.com/read/28445394/spectroscopic-detection-of-glyphosate-in-water-assisted-by-laser-ablated-silver-nanoparticles
#1
Rafael Eleodoro De Góes, Marcia Muller, José Luís Fabris
Glyphosate is one of the most widely used herbicides in the world. Its safety for both human health and aquatic biomes is a subject of wide debate. There are limits to glyphosate's presence in bodies of water, and it is usually detected through complex analytical procedures. In this work, the presence of glyphosate is detected directly through optical interrogation of aqueous solution. For this purpose, silver nanoparticles were produced by pulsed laser ablation in liquids. Limits of detection of 0.9 mg/L and 3...
April 26, 2017: Sensors
https://www.readbyqxmd.com/read/28445078/effects-of-high-intensity-interval-training-on-canoeing-performance
#2
Ming-Ta Yang, Mien-Mien Lee, Shu-Ching Hsu, Kuei-Hui Chan
The purpose of this study was to compare the effects of high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT) utilizing a canoeing ergometer on endurance determinants, as well as aerobic and anaerobic performances among flat-water canoeists. Fourteen well-trained male flat-water canoeists were divided into an HIIT group or an MICT group. All subjects performed a continuous graded exercise test (GXT) and three fixed-distance (200, 500, and 1000 m) performance tests on a canoeing ergometer to determine canoeing economy, peak oxygen uptake (VO2peak), and power at VO2peak, and to calculate the critical velocity (CV) and anaerobic work capacity before and after the training programmes...
April 26, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28444935/hydration-status-influences-the-measurement-of-arterial-stiffness
#3
Aaron R Caldwell, Matthew A Tucker, Jenna Burchfield, Nicole E Moyen, Alf Z Satterfield, Ashley Six, Brendon P McDermott, Sean W Mulvenon, Matthew S Ganio
Consensus guidelines have attempted to standardize the measurement and interpretation of pulse wave velocity (PWV); however, guidelines have not addressed whether hydration status affects PWV. Moreover, multiple studies have utilized heat stress to reduce arterial stiffness which may lead to dehydration. This study utilized two experiments to investigate the effects of dehydration on PWV at rest and during passive heat stress. In experiment 1, subjects (n = 19) completed two trials, one in which they arrived euhydrated and one dehydrated (1·2[1·0]% body mass loss)...
April 26, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28444565/technological-applications-of-organo-montmorillonites-in-the-removal-of-pyrimethanil-from-water-adsorption-desorption-and-flocculation-studies
#4
Federico M Flores, Tomas Undabeytia, Esmeralda Morillo, Rosa M Torres Sánchez
Pyrimethanil (2-aniline-4, 6-dimethylpyrimidine, PRM) is used in fruit packing plants to control fungal infections and diseases. The effluents greatly polluted with this fungicide, as a point source contamination, need to be technologically treated for their regeneration before they reach water bodies. This work evaluates the use of organo-montmorillonites, synthetized in our laboratory, for their application in adsorption and coagulation/flocculation processes for the removal of PRM from water. The adsorption-desorption performance of PRM in a raw montmorillonite (Mt) and several organo-montmorillonites (organo-Mt) obtained by different amounts and types of exchanged surfactants (octadecyltrimethylammonium (ODTMA) and didodecyldimethylammonium (DDAB) bromides and benzyltrimethylammonium chloride (BTMA)) was studied...
April 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28444473/contrasting-effects-of-engineered-carbon-nanotubes-on-plants-a-review
#5
Meththika Vithanage, Mihiri Seneviratne, Mahtab Ahmad, Binoy Sarkar, Yong Sik Ok
Rapid surge of interest for carbon nanotube (CNT) in the last decade has made it an imperative member of nanomaterial family. Because of the distinctive physicochemical properties, CNTs are widely used in a number of scientific applications including plant sciences. This review mainly describes the role of CNT in plant sciences. Contradictory effects of CNT on plants physiology are reported. CNT can act as plant growth inducer causing enhanced plant dry biomass and root/shoot lengths. At the same time, CNT can cause negative effects on plants by forming reactive oxygen species in plant tissues, consequently leading to cell death...
April 25, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28444354/easy-assessment-of-levofloxacin-and-minocycline-in-relevant-biomimetic-media-by-hplc-uv-analysis
#6
Ana C Matos, Rosana V Pinto, Ana F Bettencourt
Simple, economic and environmental friendly high-performance liquid chromatography methods for levofloxacin and minocycline quantification in biomimetic media were developed and validate including their stability at body temperature, an often neglected evaluation parameter. Both methods are similar only differing in the wavelength setting, i.e., for levofloxacin and minocycline quantification the UV detection was set at 284 and at 273 nm, respectively. The separation of both antibiotics was achieved using a reversed-phase column and a mobile phase consisting of acetonitrile and water (15:85) with 0...
April 24, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28443906/the-enhanced-anti-obesity-effect-and-reduced-gastric-mucosa-irritation-of-capsaicin-loaded-nanoemulsions
#7
Muwen Lu, Yong Cao, Chi-Tang Ho, Qingrong Huang
Capsaicin (CAP), the major active component of chili peppers, is known to have thermogenic and weight-loss potential. The aim of this study was to investigate the anti-obesity effects of capsaicin-loaded nanoemulsions (C-NE) on male Sprague Dawley (SD) rats treated with a high-fat diet (HFD). The food grade C-NE was prepared using capsaicin, medium chain triacylglycerols (MCT) (Neobee 1053), sucrose stearate S-370, Tween 80 and distilled water with an emulsion droplet size of 168 nm and a capsaicin loading of 80...
April 26, 2017: Food & Function
https://www.readbyqxmd.com/read/28443365/enhanced-phosphorus-reduction-in-simulated-eutrophic-water-a-comparative-study-of-submerged-macrophytes-sediment-microbial-fuel-cells-and-their-combination
#8
Peng Xu, Enrong Xiao, Dan Xu, Juan Li, Yi Zhang, Zhigang Dai, Qiaohong Zhou, Zhenbin Wu
The phosphorus content reduction in overlying and sediment pore water was attempted by integrating sediment microbial fuel cells (SMFCs) with the submerged macrophyte Vallisneria spiralis. A comparative study was conducted to treat simulated water rich in phosphate with a control and three treatments: SMFC alone (SMFC), submerged macrophytes alone (macophyte), and combined macrophytes and fuel cells (M-SMFC). All treatments increased sediment Eh and pH of the overlying water, thus promoting phosphorus flux from water column to sediments...
April 26, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28443079/pleomorphism-and-viability-of-the-lyme-disease-pathogen-borrelia-burgdorferi-exposed-to-physiological-stress-conditions-a-correlative-cryo-fluorescence-and-cryo-scanning-electron-microscopy-study
#9
Marie Vancová, Nataliia Rudenko, Jiří Vaněček, Maryna Golovchenko, Martin Strnad, Ryan O M Rego, Lucie Tichá, Libor Grubhoffer, Jana Nebesářová
To understand the response of the Lyme disease spirochete Borrelia burgdorferi exposed to stress conditions and assess the viability of this spirochete, we used a correlative cryo-fluorescence and cryo-scanning microscopy approach. This approach enables simple exposition of bacteria to various experimental conditions that can be stopped at certain time intervals by cryo-immobilization, examination of cell viability without necessity to maintain suitable culture conditions during viability assays, and visualization of structures in their native state at high magnification...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28442951/renal-water-conservation-determines-the-increase-in-body-weight-after-surgery-a-randomized-controlled-trial
#10
Robert G Hahn
BACKGROUND: The present study was undertaken to identify factors that correlate with the gain in body weight after surgery. METHODS: Twenty-one patients (median age of 49 years) were randomized to receive either Ringer × s acetate or 6% dextran 70 as their first infusion fluid during cholecystectomy or hysterectomy. Each patient's body weight was measured before the surgery and on the first postoperative morning. Blood and urine samples were analyzed for signs of stress, inflammation, and kidney injury...
April 2017: Saudi Journal of Anaesthesia
https://www.readbyqxmd.com/read/28442938/environmental-arsenic-exposure-and-risk-of-diabetes-type-2-in-ron-phibun-subdistrict-nakhon-si-thammarat-province-thailand-unmatched-and-matched-case-control-studies
#11
Kwanyuen Sripaoraya, Wattasit Siriwong, Sumol Pavittranon, Robert S Chapman
BACKGROUND: There are inconsistent findings on associations between low-to-moderate level of arsenic in water and diabetes risk from previous epidemiological reports. In Ron Phibun subdistrict, Nakhon Si Thammarat Province, Thailand, a low level of arsenic exposure among population was observed and increased diabetes mellitus (DM) rate was identified. OBJECTIVES: We aimed to investigate the association between determinants (including low-level water arsenic exposure) of DM type 2 risk among residents of three villages of Ron Phibun subdistrict, Nakhon Si Thammarat Province...
2017: Risk Management and Healthcare Policy
https://www.readbyqxmd.com/read/28442122/the-effect-of-temperature-on-cyclic-fatigue-of-nickel-titanium-rotary-endodontic-instruments
#12
Amandeep Dosanjh, Susan Paurazas, Mazin Askar
INTRODUCTION: This study examined the effect of different temperatures on the cyclic fatigue of nickel-titanium rotary files. METHODS: Three groups of nickel-titanium rotary files (EF group [EdgeFile; EdgeEndo, Albuquerque, NM], VB group [Vortex Blue; Dentsply Tulsa Dental Specialties, Tulsa, OK], and ESX group [ESX; Brasseler USA, Savannah, GA]) of size 25 with a .04 taper and 25-mm length were tested in a metal block that simulated a canal curvature of 60° and a 5-mm radius curvature...
May 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28442115/lipase-inhibitory-activity-of-lagenaria-siceraria-fruit-as-a-strategy-to-treat-obesity
#13
Maria Maqsood, Dildar Ahmed, Iqra Atique, Wajeeha Malik
OBJECTIVE: To explore pancreatic lipase inhibitory activity under different extraction conditions in order to track the most potent extract. METHODS: The methanolic extract and its fractions in solvents of increasing polarity, ether, chloroform, ethyl acetate, n-butanol and water, were made through cold maceration. Extracts in ethanol, ethyl acetate, acetone and chloroform were similarly prepared. Aqueous extract was prepared through hot decoction method. A reported method was used to determine lipase inhibitory activity of extracts and fractions over wide ranges of concentrations...
March 2017: Asian Pacific Journal of Tropical Medicine
https://www.readbyqxmd.com/read/28441739/the-use-of-immus-in-a-water-environment-instrument-validation-and-application-of-3d-multi-body-kinematic-analysis-in-medicine-and-sport
#14
Anna Lisa Mangia, Matteo Cortesi, Silvia Fantozzi, Andrea Giovanardi, Davide Borra, Giorgio Gatta
The aims of the present study were the instrumental validation of inertial-magnetic measurements units (IMMUs) in water, and the description of their use in clinical and sports aquatic applications applying customized 3D multi-body models. Firstly, several tests were performed to map the magnetic field in the swimming pool and to identify the best volume for experimental test acquisition with a mean dynamic orientation error lower than 5°. Successively, the gait and the swimming analyses were explored in terms of spatiotemporal and joint kinematics variables...
April 22, 2017: Sensors
https://www.readbyqxmd.com/read/28441437/quantitative-modeling-of-responses-to-chronic-ionizing-radiation-exposure-using-targeted-and-non-targeted-effects
#15
Igor Shuryak
The biological effects of chronic ionizing radiation exposure can be difficult to study, but important to understand in order to protect the health of occupationally-exposed persons and victims of radiological accidents or malicious events. They include targeted effects (TE) caused by ionizations within/close to nuclear DNA, and non-targeted effects (NTE) caused by damage to other cell structures and/or activation of stress-signaling pathways in distant cells. Data on radiation damage in animal populations exposed over multiple generations to wide ranges of dose rates after the Chernobyl nuclear-power-plant accident are very useful for enhancing our understanding of these processes...
2017: PloS One
https://www.readbyqxmd.com/read/28441345/levels-and-distribution-of-pollutants-in-the-waters-of-an-aquatic-ecosystem-in-northern-mexico
#16
Jesús Manuel Ochoa-Rivero, Ana Victoria Reyes-Fierro, Ma Del Rosario Peralta-Pérez, Francisco Javier Zavala-Díaz de la Serna, Lourdes Ballinas-Casarrubias, Ivan Salmerón, Héctor Rubio-Arias, Beatriz A Rocha-Gutiérrez
The availability of good quality water resources is essential to ensure healthy crops and livestock. The objective of this study was to evaluate the level of pollution in Bustillos Lagoon in northern Mexico. Physical-chemical parameters like sodium, chloride, sulfate, electrical conductivity, nitrates, and the pesticide dichlorodiphenyltrichloroethane (DDT) were analyzed to determine the water quality available in the lagoon. Although DDT has been banned in several countries, it is still used for agricultural purposes in Mexico and its presence in this area had not been analyzed previously...
April 25, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28440801/dispersal-timing-and-drought-history-influence-the-response-of-bacterioplankton-to-drying-rewetting-stress
#17
Anna J Székely, Silke Langenheder
The extent and frequency of drought episodes is expected to increase in the following decades making it a crucial stress factor for smaller water bodies. However, very little is known about how bacterioplankton is affected by increased evaporation and how these communities reassemble after rewetting. Here, we present results from a microcosm experiment that assessed the effect of drying-rewetting stress on bacterioplankton in the light of the stress history and the rate and timing of dispersal after the rewetting...
April 25, 2017: ISME Journal
https://www.readbyqxmd.com/read/28440370/structure-of-liquid-water-a-dynamical-mixture-of-tetrahedral-and-ring-and-chain-like-structures
#18
Jinfeng Liu, Xiao He, John Z H Zhang
The nature of the dynamical hydrogen-bond network of liquid water under ambient conditions has challenged both experimental and theoretical researchers for decades and remains a topic of intense debate. In this work, we addressed the structural issue of the hydrogen-bond network of liquid water based on an accurate ab initio molecular dynamics simulation. The present work showed clearly that liquid water is neither accurately described by a static picture of mostly tetrahedral water molecules nor dominated by "ring-and-chain" like structures...
April 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28439667/myricetin-induced-brown-adipose-tissue-activation-prevents-obesity-and-insulin-resistance-in-db-db-mice
#19
Tao Hu, Xiaoxue Yuan, Gang Wei, Haoshu Luo, Hyuek Jong Lee, Wanzhu Jin
PURPOSE: Myricetin, a dietary flavonoid, is effective in the treatment of obesity and insulin resistance by increasing glucose transport and lipogenesis in adipocyte and diminishing systemic inflammation in obesity. However, it has not been revealed yet whether myricetin is associated with brown adipose tissue (BAT) activation that tightly mediates systemic energy metabolism. Therefore, this study assessed whether myricetin activated brown adipose tissue in db/db mouse. METHODS: Myricetin (400 mg/kg) in distilled water was fed daily by oral gavage to leptin receptor-deficient db/db male mice at 4 weeks of age for 14 weeks...
April 24, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28439456/metformin-ameliorates-insulitis-in-stz-induced-diabetic-mice
#20
Xue Han, Yu-Long Tao, Ya-Ping Deng, Jia-Wen Yu, Jian Cai, Guo-Fei Ren, Yuan-Nan Sun, Guo-Jun Jiang
BACKGROUND & AIMS: Metformin is currently the most widely used first-line hypoglycemic agent for diabetes mellitus. Besides glucose-lowering action, there is increasingly interest in the potential anti-inflammatory action of this drug. In the present study, we investigated the actions of metformin on experimental insulitis using STZ-induced diabetic mice. METHODS: Mice with acute diabetes induced by STZ were administered metformin by gavage. Changes of blood glucose and body weight, and the daily amount of food and water intake were measured...
2017: PeerJ
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