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https://www.readbyqxmd.com/read/29150804/using-citrus-aurantifolia-essential-oil-for-the-potential-biocontrol-of-colocasia-esculenta-taro-leaf-blight-caused-by-phytophthora-colocasiae
#1
Séverin Nguemezi Tchameni, Staelle Njamou Mbiakeu, Modeste Lambert Sameza, Pierre Michel Dongmo Jazet, François Tchoumbougnang
The aim of this work was to evaluate the antimicrobial activities of leaves and epicarp of Citrus aurantifolia essential oil against Phytophthora colocasiae, the causative agent of taro leaf blight. Oils were extracted by hydrodistillation, and their chemical composition was determined by gas chromatography and gas chromatography coupled with mass spectrometry. Antimicrobial activities of oils were tested in vitro against mycelium growth and sporangium production. In situ tests were done on healthy taro leaves, and the necrosis symptoms were evaluated...
November 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29148716/rapid-quantification-of-4-4-methylenedianiline-by-surface-enhanced-raman-spectroscopy
#2
Samuel L Kleinman, Mark C Peterman, Merwan Benhabib, Michael T Cheng, James D Hudson, Rachel E Mohler
Methylenedianiline (MDA) is a common industrial chemical with health and product safety concerns. Common analysis methods require many steps including extraction and derivatization ending in GC-MS or HPLC analysis, which minimize its use as an on-line or at-line technique. The procedure can take hours, prohibiting its use as a real-time decision-making tool as well as using valuable resources and laboratory space. The new method presented here has been validated for MDA quantification in industrial grease samples over the concentration range of 1-40 ppm 4,4'-MDA...
November 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29147740/geo-spatial-characterization-of-soil-mercury-and-arsenic-at-a-high-altitude-bolivian-gold-mine
#3
Glen D Johnson, Brian Pavilonis, Jack Caravanos, Jean Grassman
Soil mercury concentrations at a typical small-scale mine site in the Bolivian Andes were elevated (28-737 mg/kg or ppm) in localized areas where mercury amalgams were either formed or vaporized to release gold, but was not detectable beyond approximately 10 m from its sources. Arsenic was measurable, exceeding known background levels throughout the mine site (77-137,022 ppm), and was also measurable through the local village of Ingenio (36-1803 ppm). Although arsenic levels were high at all surveyed locations, its spatial pattern followed mercury, being highest where mercury was high...
November 16, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29147443/4-nitroquinoline-1-oxide-induced-tongue-and-esophagus-carcinogenesis-in-obese-and-diabetic-tsod-mice
#4
Takuji Tanaka, Kunihiro Kawabata, Shigeyuki Sugie
Background: Obesity and diabetes mellitus are associated with lifestyle-related carcinogenesis. They are also risk factors of esophageal adenocarcinoma, but there are only a few reports on association between obesity/diabetes and development of squamous cell carcinoma in the oral cavity and esophagus. In this study, we therefore aimed to determine whether obesity and diabetes affect oral and esophageal carcinogenesis using model mice of obesity and diabetes, the Tsumura Suzuki obese diabetes (TSOD) and Tsumura Suzuki non-obesity (TSNO) control mice, which were treated with 4-nitroquinoline 1-oxide (4-NQO) to produce tongue and esophageal carcinomas...
August 2017: World Journal of Oncology
https://www.readbyqxmd.com/read/29144124/ionic-liquid-microstrips-impregnated-with-magnetic-nano-stirrers-for-sensitive-gas-sensors
#5
Richard Gondosiswanto, David Brynn Hibbert, Yu Fang, Chuan Zhao
Ionic liquids have been regarded as promising electrolytes as substitutes for volatile aqueous or organic solvents for electrochemical gas sensors. However ionic liquids are viscous and the slow diffusion of gas molecules leads to poor sensitivity and sluggish response times. Herein, we describe a strategy using an array of microstrips of ionic liquid containing magnetic nanoparticles as nano-stirrers for enhanced mass transport and gas sensing. Magnetic CoFe2O4 nanoparticles are synthesized and dispersed in a hydrophobic ionic liquid [BMP][Ntf2]...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29143974/%C3%AE-h2ax-formation-in-the-urinary-bladder-of-rats-treated-with-two-norharman-derivatives-obtained-from-o-toluidine-and-aniline
#6
T Toyoda, Y Totsuka, K Matsushita, T Morikawa, N Miyoshi, K Wakabayashi, K Ogawa
Aminomethylphenylnorharman (AMPNH) and aminophenylnorharman (APNH) are mutagenic norharman derivatives obtained from o-toluidine and aniline, respectively. APNH is carcinogenic to the urinary bladder of rats and present in urine samples of healthy volunteers, indicating that norharman derivatives may be associated with cancer development in the urinary bladder of humans. To evaluate the possible role of AMPNH and APNH in bladder carcinogenesis, we examined the formation of γ-H2AX, a DNA damage response marker, in the urinary bladder of rats...
November 16, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29143256/toxic-effects-of-solanum-xanthocarpum-sch-wendle-against-helicoverpa-armigera-hub-culex-quinquefasciatus-say-and-eisenia-fetida-savigny-1826
#7
Kathirvelu Baskar, Jeevanantham Ananthi, Savarimuthu Ignacimuthu
Many commercially available agro and household chemicals are used as pesticides, repellents, and growth inhibitors against insect pests. The repeated uses of these chemicals against insect pests have caused the development of resistance in them; they also cause ill effects on nontarget organisms. The present study was aimed to evaluate the antifeedant, larvicidal, pupicidal, and biochemical effects of the solvent extracts of Solanum xanthocarpum against third instar larvae of Helicoverpa armigera. Hexane, chloroform and ethyl acetate extracts were subjected to phytochemical analysis...
November 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29141474/assessment-of-immunotoxicity-in-female-fischer-344-n-and-sprague-dawley-rats-and-female-b6c3f1-mice-exposed-to-hexavalent-chromium-via-the-drinking-water
#8
Kelly A Shipkowski, Christopher M Sheth, Matthew J Smith, Michelle J Hooth, Kimber L White, Dori R Germolec
Sodium dichromate dihydrate (SDD), an inorganic compound containing hexavalent chromium (Cr(VI)), is a common environmental contaminant of groundwater sources due to widespread industrial use. There are indications in the literature that Cr(VI) may induce immunotoxic effects following dermal exposure, including acting as both an irritant and a sensitizer; however, the potential immunomodulatory effects of Cr(VI) following oral exposure are relatively unknown. Following the detection of Cr(VI) in drinking water sources, the National Toxicology Program (NTP) conducted extensive evaluations of the toxicity and carcinogenicity of SDD following drinking water exposure, including studies to assess the potential for Cr(VI) to modulate immune function...
December 2017: Journal of Immunotoxicology
https://www.readbyqxmd.com/read/29141035/influence-of-boron-supplementation-on-performance-immunity-and-antioxidant-status-of-lambs-fed-diets-with-or-without-adequate-level-of-calcium
#9
T Vijay Bhasker, N K S Gowda, D T Pal, S Karthik Bhat, P Krishnamoorthy, S Mondal, A K Pattanaik, A K Verma
Little is known about biological significance of effects of dietary Boron (B) and Calcium (Ca) interaction on health and production of farm animals. This is a preliminary investigation to evaluate the effects of B supplementation in lambs fed diets with (normal) or without adequate (low) levels of Ca. Twenty-four crossbred ram lambs were randomly distributed into four groups with six animals each in a 2x2 factorial design namely, normal-Ca diet (NCa) and low-Ca diet (LCa) fed without or with 40 ppm B (NCaB-40 and LCaB-40)...
2017: PloS One
https://www.readbyqxmd.com/read/29140644/evaluation-of-low-cost-hydrogen-sulfide-monitors-for-use-in-livestock-production
#10
Jessica M Beswick-Honn, Thomas M Peters, T Renée Anthony
Direct-reading gas monitors warn workers of the risk of potentially fatal hydrogen sulfide (H2S) exposures that may arise during manure handling. Low-cost, low-maintenance H2S monitors are available from many manufacturers, but differences in their features and performance make selection challenging for farmers. Moreover, little information is available on the practical maintenance and performance of these devices in agricultural environments. The objective of this study was to provide information to agricultural workers to aid in the selection, maintenance, and use of low-cost H2S monitors...
November 20, 2017: Journal of Agricultural Safety and Health
https://www.readbyqxmd.com/read/29140643/assessment-of-interventions-to-improve-air-quality-in-a-livestock-building
#11
T Renée Anthony, Anthony Y Yang, Thomas M Peters
This study examined the effectiveness of engineering controls to reduce contaminant concentrations in a swine farrowing room during winter in the U.S. Midwest. Over two winters, changes in air quality were evaluated following installation of a 1700 m3 h-1 (1000 cfm) recirculating ventilation system to provide 5.4 air exchanges per hour. This system incorporated one of two readily available dust control systems, one based on filtration and the other on cyclonic treatment. A second treatment evaluated reductions in carbon dioxide (CO2) associated with replacement of standard, unvented gas-fired heaters with new vented heaters, installed between the two winter test periods...
November 20, 2017: Journal of Agricultural Safety and Health
https://www.readbyqxmd.com/read/29140615/operator-exposure-to-hydrogen-sulfide-from-dairy-manure-storages-containing-gypsum-bedding
#12
Eileen E Fabian-Wheeler, Michael L Hile, Dennis J Murphy, Davis E Hill, Robert Meinen, Robin C Brandt, Hershel A Elliott, Daniel Hofstetter
Dairy manure storages containing gypsum-based bedding have been linked anecdotally with injury and death due to presumed dangerous levels of gases released. Recycled gypsum products are used as a cost-effective bedding alternative to improve animal welfare and provide agronomic benefits to manure recycled back to the land. Sulfur contained in gypsum (calcium sulfate) can contribute to hydrogen sulfide (H2S) gas formation under the anaerobic storage conditions typical of dairy manure slurry. Disturbance of stored manure during agitation releases a burst of volatile gases...
January 26, 2017: Journal of Agricultural Safety and Health
https://www.readbyqxmd.com/read/29138995/optimization-of-chromium-and-tannic-acid-bioremediation-by-aspergillus-niveus-using-plackett-burman-design-and-response-surface-methodology
#13
Prachi Chaudhary, Vinod Chhokar, Pragati Choudhary, Anil Kumar, Vikas Beniwal
A chromium and tannic acid resistance fungal strain was isolated from tannery effluent, and identified as Aspergillus niveus MCC 1318 based on its rDNA gene sequence. The MIC (minimum inhibitory concentration) of the isolate against chromium and tannic acid was found to be 200 ppm and 5% respectively. Optimization of physiochemical parameters for biosorption of chromium and tannic acid degradation was carried out by Plackett-Burman design followed by response surface methodology (RSM). The maximum chromium removal and tannic acid degradation was found to be 92 and 68% respectively by A...
November 14, 2017: AMB Express
https://www.readbyqxmd.com/read/29137570/description-and-evaluation-of-a-peracetic-acid-air-sampling-and-analysis-method
#14
John Nordling, Owen R Kinsky, Magdalena Osorio, Nathan Pechacek
Peracetic acid (PAA) is a corrosive chemical with a pungent odor, which is extensively used in occupational settings and causes various health hazards in exposed workers. Currently, there is no US government agency recommended method that could be applied universally for the sampling and analysis of PAA. Legacy methods for determining airborne PAA vapor levels frequently suffered from cross-reactivity with other chemicals, particularly hydrogen peroxide (H2O2). Therefore, to remove the confounding factor of cross-reactivity, a new viable, sensitive method was developed for assessment of PAA exposure levels, based on the differential reaction kinetics of PAA with methyl p-tolylsulfide (MTS), relative to H2O2, to preferentially derive methyl p-tolysulfoxide (MTSO)...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/29135919/acoustic-sensors-based-on-amino-functionalized-nanoparticles-to-detect-volatile-organic-solvents
#15
Daniel Matatagui, Oleg Kolokoltsev, José Manuel Saniger, Isabel Gràcia, María Jesús Fernández, Jose Luis Fontecha, María Del Carmen Horrillo
Love-wave gas sensors based on surface functionalized iron oxide nanoparticles has been developed in this research. Amino-terminated iron oxide nanoparticles were deposited, by a spin coating technique, onto the surface of Love-wave sensors, as a very reproducible gas-sensing layer. The gases tested were organic solvents, such as butanol, isopropanol, toluene and xylene, for a wide and low concentration range, obtaining great responses, fast response times of a few minutes (the time at which the device produced a signal change equal to 90%), good reproducibilities, and different responses for each detected solvent...
November 14, 2017: Sensors
https://www.readbyqxmd.com/read/29135028/effects-of-hydrolyzed-rapeseed-cake-extract-on-the-quality-characteristics-of-mayonnaise-dressing
#16
Ye-Seul Kim, Jeung-Hee Lee
Combined fractions (H2 O and 30% and 50% ethanol) of crude rapeseed cake extracts with 80% ethanol were hydrolyzed with NaOH solution. The hydrolyzed extract showed significantly higher contents of total phenolics (41.8 mg SAE/g) and sinapic acid (425.8 mg/g), as well as higher 1,1-diphenyl-2-picryl-hydrazyl radical-scavenging capacity (91.98 RSC%) than the crude extract (P < 0.05). Antimicrobial activity of the hydrolyzed extract was remarkably higher than that of the crude extract against selected Gram-positive and Gram-negative bacteria as well as yeast, as determined by the minimum inhibitory concentration method...
November 14, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/29135023/effects-of-different-pretreatments-to-fresh-fruit-on-chemical-and-thermal-characteristics-of-crude-palm-oil
#17
Minmin Tang, Qiuyu Xia, Brendan J Holland, Hui Wang, Yufeng Zhang, Rui Li, Hongxing Cao
This study selected 5 methods, including boiling, hot air drying, high-pressurized steam, freezing, and microwave radiation to pretreat fresh oil palm fruit before solvent extraction of the oil. Using fresh fruit as a control, the pretreatment methods were compared for the effects on the activity of the 2 main enzymes in the fruit and some physicochemical properties of the crude palm oil. The results indicated, although all the 5 pretreatments could inactivate lipase and peroxidase in the treated flesh significantly (P < 0...
November 14, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/29134791/qualitative-analysis-of-flavors-and-fragrances-added-to-tea-by-using-gc-ms
#18
Jianwu Wang, Yuanxin Hang, Tingting Yan, Jiahui Liang, Zhiqiang Huang, Huilan Xu
A precise identification method was developed to identify the flavors and fragrances added to tea matrix artificially using gas chromatography with mass spectrometry and gas chromatography with quadrupole time-of-flight mass spectrometry. The proposed method was based on the corresponding "three-column retention indices, two exact mass numbers, one mass spectrum matching degree" database of 40 kinds of common flavors and fragrances. The intra-day and the inter-day relative standard deviation of the retention indices were less than 0...
November 14, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29134433/practice-makes-perfect-relationship-between-hospital-procedure-volume-and-permanent-pacemaker-implantation-after-paroxysmal-supraventricular-tachycardia-ablation
#19
Vratika Agarwal, Neeraj Shah, Kathan Mehta, Anand Agarwal, Jonathan Willner, James Lafferty
PURPOSE: Paroxysmal supraventricular tachycardia (PSVT) ablation can result in injury to the atrioventricular (AV) node causing complete heart block requiring permanent pacemaker (PPM) implantation. Few studies have examined the impact of hospital PSVT ablation volume and PPM implantation rates post ablation. METHODS: We included adult patients from the Nationwide Inpatient Sample (NIS) database, from 1998 to 2011, using ICD-9 diagnoses codes 427.0 and 427.89 for PSVT and ICD-9 procedure code 37...
November 13, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/29132370/expanding-malaria-diagnosis-and-treatment-in-lao-pdr-lessons-learned-from-a-public-private-mix-initiative
#20
Nouannipha Simmalavong, Sengkham Phommixay, Phoudaliphone Kongmanivong, Odai Sichanthongthip, Bouasy Hongvangthong, Deyer Gopinath, David M Sintasath
BACKGROUND: As in other countries of the Greater Mekong Sub-region (GMS), the private health sector constitutes a significant avenue where malaria services are provided and presents a unique opportunity for public-private collaboration. In September 2008, a public-private mix (PPM) strategy was launched initially in four northern and southern provinces in Lao PDR to increase access to rapid diagnostic tests (RDTs) and artemisinin-based combination therapy (ACT), improve quality of care, and collect routine malaria data from the private sector...
November 13, 2017: Malaria Journal
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