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https://www.readbyqxmd.com/read/28213227/a-single-molecular-fluorescent-probe-for-selective-and-sensitive-detection-of-nitroaromatic-explosives-a-new-strategy-for-the-mask-free-discrimination-of-tnt-and-tnp-within-same-sample
#1
Zhe Zhang, Shusen Chen, Rui Shi, Jiawen Ji, Dequan Wang, Shaohua Jin, Tongyu Han, Chenxiao Zhou, Qinghai Shu
A simple naphthalene based fluorescent probe was first time reported as dual sensing of 2,4,6-trinitrotolune (TNT) and 2,4,6-trinitrophenol (TNP) by distinguishable changes in both solution color change and fluorescence within same sample without any mask agent. Upon addition of TNT and TNP, the strong emission quenching at 412nm and a new emission band at 530nm was observed, respectively. In addition, the sensing mechanism was evaluated by DFT calculations by Gaussian 09 software.
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28192949/one-pot-synthesis-of-fluorescent-silicon-nanoparticles-for-sensitive-and-selective-determination-of-2-4-6-trinitrophenol-in-aqueous-solution
#2
Yangxia Han, Yonglei Chen, Jie Feng, Juanjuan Liu, Sudai Ma, Xingguo Chen
Since 2,4,6-trinitrophenol (TNP) and its analogues such as 2,4,6-trinitrotoluene (TNT) possess similar chemical structures and properties, the reliable and accurate detection of TNP from its analogues still remained a challenging task. In the present work, a selective and sensitive method based on the water-soluble silicon nanoparticles (SiNPs) for the determination of TNP was established. The SiNPs with good thermostability and excellent anti-photobleaching capability were prepared via a simple one-pot method...
February 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28192365/zero-valent-metal-loaded-silica-nanoparticles-for-the-removal-of-tnt-from-water
#3
Harsha Mangal, Amit Saxena, Nivedita Shukla, P K Rai, A S Rawat, Vivek Kumar, Vatsana Gupta, Monika Datta
Silica nanoparticles with a surface area of 673.60 m(2)/g and particle size of 8-12 nm were prepared using aerogel process (AP) followed by super critical drying. Zero valent Fe, Co, Pt, and bimetallic Fe/Pt and Fe/Co were loaded using an incipient wetness impregnation technique and subsequent reduction. Scanning electron microscopy-energy dispersive X-ray (SEM-EDX) and transmission electron microscopy-energy dispersive X-ray (TEM-EDX) characterizations indicated fine dispersion of iron on AP-SiO2 +Fe system...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28188348/graphene-oxide-fe3o4-as-sorbent-for-magnetic-solid-phase-extraction-coupled-with-liquid-chromatography-to-determine-2-4-6-trinitrotoluene-in-water-samples
#4
Luciana Costa Dos Reis, Lorena Vidal, Antonio Canals
A fast, simple, economical, and environmentally friendly magnetic solid-phase extraction (MSPE) procedure has been developed to preconcentrate 2,4,6-trinitrotoluene (TNT) from water samples prior to determination by liquid chromatography-UV-Vis employing graphene oxide/Fe3O4 nanocomposite as sorbent. The nanocomposite synthesis was investigated, and the MSPE was optimized by a multivariate approach. The optimum MSPE conditions were 40 mg of nanocomposite, 10 min of vortex extraction, 1 mL of acetonitrile as eluent, and 6 min of desorption in an ultrasonic bath...
February 10, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28177052/reassessment-and-relationships-of-%C3%A2-scutatuspinosus-itapagipensis-teleostei-clupeomorpha-%C3%A2-ellimmichthyiformes-from-the-neocomian-of-rec%C3%A3-ncavo-basin-northeastern-brazil
#5
Francisco J DE Figueiredo, Douglas R M Ribeiro
Clupeomorphs are found in many assemblages of the northeastern Brazil, whose ages range from the Neocomian to Paleogene. Ten species were described. Among them †Scutatuspinosus itapagipensis, a torpedo-like fish found in shales of the Marfim Formation from Bahia, remains poorly known. At first it was positioned within †Scutatuspinosinae and indicated as closely related to †Diplomystus. Diagnoses for the subfamily and genus were based on certain characters masking relationships. Recently it was placed in †Ellimmichthyiformes, but its systematic position remains controversial...
February 6, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28176281/phylogenetic-relationships-within-phyllophaga-harris-sensu-lato-coleoptera-melolonthidae-melolonthinae-with-emphasis-on-listrochelus-blanchard
#6
S L Rivera-Gasperín, M A Morón Rios
As partial results of a long-term project for the revision of the supraspecific classification of the American Melolonthini, using phylogenetic methods, interesting information on the relationships between the subgeneric groups of Phyllophaga Harris proposed by Saylor were obtained. The genus Listrochelus was described by Blanchard in 1851. However, in 1940, Saylor reduced it as a subgenus of Phyllophaga. The objective of the present study is to confirm the monophyly of Listrochelus by means of a phylogenetic analysis...
February 7, 2017: Neotropical Entomology
https://www.readbyqxmd.com/read/28167031/opinion-taking-phytoremediation-from-proven-technology-to-accepted-practice
#7
REVIEW
Karen E Gerhardt, Perry D Gerwing, Bruce M Greenberg
Phytoremediation is the use of plants to extract, immobilize, contain and/or degrade contaminants from soil, water or air. It can be an effective strategy for on site and/or in situ removal of various contaminants from soils, including petroleum hydrocarbons (PHC), polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), solvents (e.g., trichloroethylene [TCE]), munitions waste (e.g., 2,4,6-trinitrotoluene [TNT]), metal(loid)s, salt (NaCl) and radioisotopes. Commercial phytoremediation technologies appear to be underutilized globally...
March 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28157864/laser-shocked-energetic-materials-with-metal-additives-evaluation-of-chemistry-and-detonation-performance
#8
Jennifer L Gottfried, Eric J Bukowski
A focused, nanosecond-pulsed laser has been used to ablate, atomize, ionize, and excite milligram quantities of metal-doped energetic materials that undergo exothermic reactions in the laser-induced plasma. The subsequent shock wave expansion in the air above the sample has been monitored using high-speed schlieren imaging in a recently developed technique, laser-induced air shock from energetic materials (LASEM). The method enables the estimation of detonation velocities based on the measured laser-induced air-shock velocities and has previously been demonstrated for organic military explosives...
January 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28153227/quantifying-the-stability-of-trace-explosives-under-different-environmental-conditions-using-electrospray-ionization-mass-spectrometry
#9
Edward Sisco, Marcela Najarro, Daniel Samarov, Jeffrey Lawrence
This work investigates the stability of trace (tens of nanograms) deposits of six explosives: erythritol tetranitrate (ETN), pentaerythritol tetranitrate (PETN), cyclotrimethylenetrinitramine (RDX), cyclotetramethylenetetranitramine (HMX), 2,4,6-trinitrotoluene (TNT), and 2,4,6-trinitrophenylmethylnitramine (tetryl) to determine environmental stabilities and lifetimes of trace level materials. Explosives were inkjet printed directly onto substrates and exposed to one of seven environmental conditions (Laboratory, -4°C, 30°C, 47°C, 90% relative humidity, UV light, and ozone) up to 42 days...
April 1, 2017: Talanta
https://www.readbyqxmd.com/read/28145489/improving-the-diagnostic-accuracy-of-acute-myocardial-infarction-with-the-use-of-high-sensitive-cardiac-troponin-t-in-different-chronic-kidney-disease-stages
#10
Hongliu Yang, Jing Liu, Han Luo, Xiaoxi Zeng, Xi Tang, Liang Ma, Hongxia Mai, Shenju Gou, Fang Liu, Ping Fu
High-sensitive cardiac troponin T (hs-TnT) is a critical biomarker in diagnosis of acute myocardial infarction (AMI). However, CKD individuals usually have elevated hs-TnT even in the absence of AMI. Our study aimed to explore the optimal cutoff-value of hs-TnT and further to improve diagnostic accuracy of AMI in CKD patients. Clinical data of 489 patients were collected from the maintained database between September 2010 and June 2014. CKD patients with AMI were assigned to CKD+AMI group and CKD patients without AMI were assigned to CKD group...
February 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28134126/changes-in-high-sensitivity-troponin-after-drug-coated-balloon-angioplasty-for-drug-eluting-stent-restenosis
#11
Roisin Colleran, Yukinora Harada, Sebastian Kufner, Daniele Giacoppo, Michael Joner, Salvatore Cassese, Tareq Ibrahim, Karl-Ludwig Laugwitz, Adnan Kastrati, Robert A Byrne
AIMS: Success of drug-coated balloon therapy might be compromised by intraprocedural particulate embolization of matrix coating, which may cause downstream microvascular obstruction. We aimed to investigate whether drug-coated balloon therapy was associated with an increase in markers of myocardial necrosis compared with drug-eluting stents or plain balloon angioplasty. METHODS AND RESULTS: In the ISAR DESIRE 3 trial, patients with limus-eluting stent restenosis were randomized to treatment with a paclitaxel-coated balloon (PCB), paclitaxel-eluting stent (PES) or balloon angioplasty (BA)...
January 31, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28121427/riboswitch-based-reversible-dual-color-sensor
#12
Svetlana V Harbaugh, Michael S Goodson, Kateri Dillon, Sarah Zabarnick, Nancy Kelley-Loughnane
Riboswitches are RNA-based 'sensors' that utilize chemically-induced structural changes in the 5'-untranslated region of mRNA to regulate expression of downstream genes. Coupling a specific riboswitch with a reporter gene system translates chemical detection by the cell into a quantifiable reporter protein signal. For the majority of reporter gene systems the readout signal is only expressed in the presence of the target analyte. This makes it difficult to determine the viability and localization of the uninduced biosensor when it is used for 'real-word' applications...
January 25, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28107996/the-stability-of-tnt-rdx-and-petn-in-simulated-post-explosion-soils-implications-of-sample-preparation-for-analysis
#13
H A Yu, D A DeTata, S W Lewis, N Nic Daeid
Explosives residues in soils may be a useful source of evidence following the detonation of an improvised explosive device (IED), such as a vehicle-borne IED. Soil samples collected from the vicinity of an explosion scene will often be stored for some time prior to analysis, yet explosives residues in soil samples are susceptible to rapid degradation or transformation. Although some research has assessed the use of different storage temperatures with a view to reducing explosives' degradation over time, further research examining the degradation of explosives in soil when stored under a variety of storage conditions is crucial to determine the optimal sample collection and storage procedures for soil containing explosives residues...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28087154/evaluation-of-serial-high-sensitivity-troponin-t-levels-in-individuals-without-overt-coronary-heart-disease-following-exercise-stress-testing
#14
Yousef M E Saad, Hanan Idris, Ibrahim M Shugman, Krishna K Kadappu, Rohan Rajaratnam, Liza Thomas, Christian Mussap, Dominic Y C Leung, Craig P Juergens, John K French
BACKGROUND: Detectable levels of high sensitivity (cardiac) troponin T (HsTnT), occur in the majority of patients with stable coronary heart disease (CHD), and often in 'healthy' individuals. Extreme physical activity may lead to marked elevations in creatine kinase MB and TnT levels. However, whether HsTnT elevations occur commonly after exercise stress testing (EST), and if so, whether this has clinical significance, needs clarification. METHODS: To determine whether HsTnT levels become elevated after EST (Bruce protocol) to ≥95% of predicted maximum heart rate in presumed healthy subjects without overt CHD, we assayed HsTnT levels for ∼5h post-EST in 105 subjects (median age 37 years)...
December 9, 2016: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28073264/metal-organic-polyhedra-coated-si-nanowires-for-the-sensitive-detection-of-trace-explosives
#15
Anping Cao, Wei Zhu, Jin Shang, Johan H Klootwijk, Ernst J R Sudhölter, Jurriaan Huskens, Louis C P M de Smet
Surface-modified silicon nanowire-based field-effect transistors (SiNW-FETs) have proven to be a promising platform for molecular recognition in miniature sensors. In this work, we present a novel nanoFET device for the sensitive and selective detection of explosives based on affinity layers of metal-organic polyhedra (MOPs). The judicious selection of the geometric and electronic characteristics of the assembly units (organic ligands and unsaturated metal site) embedded within the MOP cage allowed for the formation of multiple charge-transfer (CT) interactions to facilitate the selective explosive inclusion...
January 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28070907/analysis-of-explosives-by-gc-uv
#16
Jan Andrasko, Ludmila Lagesson-Andrasko, Johan Dahlén, Bengt-Harald Jonsson
A mixture of explosives was analyzed by gas chromatography (GC) linked to ultraviolet (UV) spectrophotometry that enabled detection in the range of 178-330 nm. The gas-phase UV spectra of 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (DNT), ethylene glycol dinitrate (EGDN), glycerine trinitrate (NG, nitroglycerine), triacetone triperoxide (TATP), and pentaerythritol tetranitrate (PETN) were successfully recorded. The most interesting aspect of the current application is that it enabled simultaneous detection of both the target analyte and its decomposition products...
January 10, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28069837/high-sensitive-cardiac-troponin-t-as-a-novel-predictor-for-recurrence-of-atrial-fibrillation-after-radiofrequency-catheter-ablation
#17
Koki Nakanishi, Shota Fukuda, Hajime Yamashita, Toshifumi Hasegawa, Michihiko Kosaka, Naoya Shirai, Kenei Shimada, Junichi Yoshikawa, Atsushi Tanaka
AIMS: We aimed to determine whether elevated serum high-sensitive cardiac troponin T (hs-TnT) levels predict atrial fibrillation (AF) recurrence after pulmonary vein isolation (PVI). METHODS AND RESULTS: We included 125 consecutive patients with AF (paroxysmal, n = 79; persistent, n = 46) who underwent first-time PVI. Serum hs-TnT, high-sensitive C-reactive protein (hs-CRP), atrial natriuretic peptide, and plasma B-type natriuretic peptide levels were measured in venous samples collected before PVI...
January 8, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28059482/aquatic-toxicity-of-photo-degraded-insensitive-munition-101-imx-101-constituents
#18
Alan J Kennedy, Aimee R Poda, Nicolas L Melby, Lee C Moores, Shinita M Jordan, Kurt A Gust, Anthony J Bednar
Insensitive munitions (IMs) are desirable alternatives to historically used formulations, such as 2,4,6-trinitrotoluene (TNT), due to their "insensitivity" to unintended detonation. The insensitive munition IMX-101 is a mixture of 2,4-dinitroanisole (DNAN), 3-nitro-1,2,4-triazol-5-one (NTO), and nitroguanidine (NQ). Environmental releases of munitions may be from production wastewaters or training; these munitions may be exposed to Ultraviolet light. Therefore, it is useful to understand the relative toxicity of IMX-101 and its constituents both before and after photo-degradation...
January 6, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28054330/double-sided-transparent-tio2-nanotube-ito-electrodes-for-efficient-cds-cuins2-quantum-dot-sensitized-solar-cells
#19
Chong Chen, Lanyu Ling, Fumin Li
In this paper, to improve the power conversion efficiencies (PCEs) of quantum dot-sensitized solar cells (QDSSCs) based on CdS-sensitized TiO2 nanotube (TNT) electrodes, two methods are employed on the basis of our previous work. First, by replacing the traditional single-sided working electrodes, double-sided transparent TNT/ITO (DTTO) electrodes are prepared to increase the loading amount of quantum dots (QDs) on the working electrodes. Second, to increase the light absorption of the CdS-sensitized DTTO electrodes and improve the efficiency of charge separation in CdS-sensitized QDSSCs, copper indium disulfide (CuInS2) is selected to cosensitize the DTTO electrodes with CdS, which has a complementary property of light absorption with CdS...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28040285/diagnostic-performance-of-a-high-sensitive-troponin-t-assay-and-a-troponin-t-point-of-care-assay-in-the-clinical-routine-of-an-emergency-department-a-clinical-cohort-study
#20
Anna Slagman, Johannes von Recum, Martin Möckel, Fabian Holert, Dirk Meyer Zum Büschenfelde, Christian Müller, Julia Searle
BACKGROUND: A point of care test (POCT) for troponin T (TnT) in the Emergency Department (ED) was compared to a high-sensitivity TnT (hsTnT) central laboratory test (CLT) to determine the influence of test system and different cut-off values on the diagnostic performance in patients with suspected acute coronary syndrome (ACS) under routine conditions. METHODS: All patients with routine TnT testing in the ED were enrolled. Only internal medicine patients without STEMI and with both troponin values were analyzed...
March 1, 2017: International Journal of Cardiology
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