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https://www.readbyqxmd.com/read/29337555/reconsideration-of-the-detection-and-fluorescence-mechanism-for-a-pyrene-based-chemosensor-for-tnt
#1
Meiheng Lu, Panwang Zhou, Yinhua Ma, Zhe Tang, Yanqiang Yang, Keli Han
Rapid detection of chemical explosives is crucial for national security and public safety, and investigation of sensing mechanisms is important to design highly efficient chemosensors. This study theoretically investigates the detection and fluorescence mechanism of a newly synthesized pyrene based chemosensor for detection of trinitrotoluene (TNT) through density functional theory (DFT) and time-dependent density functional theory (TDDFT) methods, suggesting a different interaction product of the probe and TNT from previously reported ones (Mosca, L...
January 16, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29331905/macrophage-phenotype-switch-by-sequential-action-of-immunomodulatory-cytokines-from-hydrogel-layers-on-titania-nanotubes
#2
Junhong Chen, Mengting Li, Congling Yang, Xianzhen Yin, Ke Duan, Jianxin Wang, Bo Feng
Inflammatory response occurring between tissues and implants after implantation has attracted increasing attention because it can cause local tissue necrosis and even implant failure. Macrophages play a key role in all stages of inflammation. Pro-inflammatory (M1) and anti-inflammatory (M2) macrophages comprise two main phenotypes and the switch from M1 to M2 at specific time points is important for wound healing and tissue regeneration. Therefore, we hypothesized that biomaterial systems capable of facilitating macrophage phenotype switching should attenuate inflammation and enhance healing...
January 9, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29328542/towards-the-detection-of-explosive-taggants-microwave-and-millimetre-wave-gas-phase-spectroscopies-of-3-nitrotoluene
#3
Anthony Roucou, Isabelle Kleiner, Manuel Goubet, Sabath Bteich, Gaël Mouret, Robin Bocquet, Francis Hindle, W Leo Meerts, Arnaud Cuisset
The monitoring of gas phase mononitrotoluenes is crucial for defence, civil security and environmental interests since they are used as taggant for TNT detection and in the manufacturing of industrial compounds such as dyestuffs. In this study, we have succeeded to measure and analyse at high resolution a room temperature rotationally resolved millimeter-wave spectrum of meta-nitrotoluene(3-NT). Experimental and theoretical difficulties have been overcome, in particular, those related to the low vapour pressure of 3-NT and to the presence of a CH$_3$ internal rotation in an almost free rotation regime ($V_3$=6...
January 12, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29325368/-the-effects-and-related-mechanism-of-salvianolate-on-rats-with-myocardial-ischemia-reperfusion-injury
#4
R C Yue, X L Yang, R Y Zhang, S Liu, J Liu, J Zeng, H Liang, W Wang, H X Hu, C Y Zeng
Objective: To investigate the effect and related mechanism of salvianolate on myocardial ischemia-reperfusion (I/R) injury in rats. Methods: Thirty-six adult Sprague-Dawley rats were divided into three groups (n=12 each) using random number table method: control group (coronary artery was not ligated) , I/R group (myocardial I/R model was established by ligation and opening of left anterior descending coronary artery) , and salvianolate+I/R group (5 mg/kg of salvianolate was injected through the tail vein at the time of reperfusion) ...
December 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/29322434/protection-from-reperfusion-injury-with-intracoronary-n-acetylcysteine-in-patients-with-stemi-undergoing-primary-percutaneous-coronary-intervention-in-a-cardiac-tertiary-center
#5
Younes Nozari, Azadeh Eshraghi, Azita Hajhossein Talasaz, Mostafa Bahremand, Jamshid Salamzadeh, Mojtaba Salarifar, Hamidreza Pourhosseini, Arash Jalali, Seyedeh Hamideh Mortazavi
BACKGROUND: Evidence suggests that oxidative stress plays a principal role in myocardial damage following ischemia/reperfusion events. Recent studies have shown that the antioxidant properties of N-acetylcysteine (NAC) may have cardioprotective effects in high doses, but-to the best of our knowledge-few studies have assessed this. OBJECTIVES: Our objective was to investigate the impact of high-dose NAC on ischemia/reperfusion injury. METHODS: We conducted a randomized double-blind placebo-controlled trial in which 100 consecutive patients with ST-elevation myocardial infarction undergoing percutaneous coronary intervention (PCI) were randomly assigned to the case group (high-dose NAC 100 mg/kg bolus followed by intracoronary NAC 480 mg during PCI then intravenous NAC 10 mg/kg for 12 h) or the control group (5% dextrose)...
January 10, 2018: American Journal of Cardiovascular Drugs: Drugs, Devices, and Other Interventions
https://www.readbyqxmd.com/read/29319002/mos-sub-2-sub-quantum-dots-tio-sub-2-sub-nanotube-composites-with-enhanced-photoexcited-charge-separation-and-high-efficiency-visible-light-driven-photocatalysis
#6
Fenfen Zhao, Yuefei Rong, Junmin Wan, Zhiwen Hu, Zhiqin Peng, Bing Wang
MoS2 quantum dots (QDs) that are 5 nm in size were deposited on the surface of ultrathin TiO2 nanotubes (TNTs) with 5 nm wall thickness by using an improved hydrothermal method to form a MoS2 QDs@TNT visible-light photocatalyst. The ultrathin TNTs with high percentage of photocatalytic reactive facets were fabricated by the commercially available TiO2 nanoparticles (P25) through an improved hydrothermal method, and the MoS2 QDs were acquired by using a surfactant-assisted technique. The novel MoS2 QDs@TNT photocatalysts showed excellent photocatalytic activity with a decolorization rate of 92% or approximately 3...
January 10, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29313689/porous-interdigitation-molecular-cage-from-tetraphenylethylene-trimeric-macrocycles-that-showed-highly-selective-adsorption-of-co2-and-tnt-vapor-in-air
#7
Jia-Bin Xiong, Jin-Hua Wang, Bao Li, Chun Zhang, Bien Tan, Yan-Song Zheng
A new [3 + 3] trimeric macrocycle, based on tetraphenylethylene having an aggregation-induced emission effect, could form a interdigitation molecular cage with a big void by host-guest interactions. The cage could accommodate two TNT molecules and detect TNT at the 1.7 fg level per mL of air. Moreover, the cage could give permanent pores that had a BET surface area of 347 m2/g and could adsorb 7.8 wt % CO2 with high CO2/N2 selectivity up to 32 (273 K, 1 bar).
January 9, 2018: Organic Letters
https://www.readbyqxmd.com/read/29310884/prognostic-value-of-high-sensitivity-versus-conventional-cardiac-troponin-t-assays-among-patients-with-type-2-diabetes-mellitus-undergoing-maintenance-hemodialysis
#8
Till Keller, Christoph Wanner, Vera Krane, Daniel Kraus, Bernd Genser, Hubert Scharnagl, Winfried März, Christiane Drechsler
BACKGROUND: Mortality is high among patients undergoing hemodialysis for whom cardiac troponin concentration is a strong predictor of outcome. Modern troponin assays allow measurement of very low concentrations. STUDY DESIGN: Using data from a randomized controlled trial, a cohort analysis to evaluate the prognostic value of very low cardiac troponin T (TnT) concentrations. SETTING & PARTICIPANTS: 1,255 patients with end-stage renal disease and type 2 diabetes mellitus undergoing maintenance hemodialysis from the German Diabetes and Dialysis Study (4D) who had a median follow-up of 4 years...
January 5, 2018: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/29310209/highly-fluorescent-sensing-of-nitroaromatic-explosives-in-aqueous-media-using-pyrene-linked-pbema-microspheres
#9
Hamza Turhan, Ece Tukenmez, Bunyamin Karagoz, Niyazi Bicak
Crosslinked 2-bromoethyl methacrylate polymer (PBEMA) was prepared in micro-spherical form (2-5µm) by precipitation polymerization methodology. The bromide substituent was substituted with an azide group, which was then coupled with 1-[(2-Propynyloxy)methyl]pyrene] via alkyne-azide click chemistry. The pyrene-linked microspheres showed an intense green-blue excimer emission with a maximum at 480nm, implying π-π stacking between the pyrene moieties on the microsphere surfaces. This fluorescence emission is extremely sensitive to the aromatic nitro compounds...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29303610/how-to-interpret-elevated-plasmatic-level-of-high-sensitive-troponin-t-in-newborns-and-infants
#10
P Jehlicka, M Huml, D Rajdl, A Mockova, M Matas, J Dort, A Masopustova
Research and clinical implications on novel cardiac biomarkers has intensified significantly in the past few years. The high-sensitive troponin T (hscTnT) assay plays a dominant role in diagnostic algorithm regarding myocardial injury in adults. Despite generally accepted use of hscTnT there are no data about physiological concentrations and cut-off limits in neonates and infants to date. The aim of this study is to assess hscTnT levels in healthy newborns and infants. Consecutively 454 healthy full termed newborns and 40 healthy infants were enrolled in the study...
January 5, 2018: Physiological Research
https://www.readbyqxmd.com/read/29301457/diffusion-of-energetic-compounds-through-biological-membrane-application-of-classical-md-and-cosmomic-approximations
#11
Anastasiia Golius, Leonid Gorb, Olexander Isayev, Jerzy Leszczynski
Computational studies of the potential biological impact of several energetic compounds were performed. The most commonly used explosives were considered in the present studies: trinitrotoluene (TNT), 2,4-dinitrotoluene (2,4-DNT), 2,4-dinitroanisole (DNAN), and 5-Nitro-2,4-dihydro-3H-1,2,4-triazol-3-one (NTO). The effect of such factors as ionic strength and presence of DMSO in the water solution on the structure of the membrane were considered using the POPC lipid bilayer as an example. Molecular dynamics (MD) simulations revealed that, even on a short-time scale, the influence of those additives is noticeable, and therefore those factors should always be taken into account...
January 4, 2018: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29301269/enhancing-of-osseointegration-with-propolis-loaded-tio%C3%A2-nanotubes-in-rat-mandible-for-dental-implants
#12
Nithideth Somsanith, Yu-Kyoung Kim, Young-Seok Jang, Young-Hee Lee, Ho-Keun Yi, Jong-Hwa Jang, Kyoung-A Kim, Tae-Sung Bae, Min-Ho Lee
TiO₂ nanotubes (TNT) formation is beneficial for improving bone cell-material interaction and drug delivery for Ti dental implants. Among the natural drugs to be installed in TNT, selected propolis has antibacterial and anti-inflammatory properties. It is a resinous natural product which is collected by the honeybees from the various types of plants with their salivary enzymes. This study concludes that TNT loaded with a propolis (PL-TNT-Ti) dental implant has the ability to improve osseointegration. The propolis particles were embedded within the TNT or adhered to the top...
January 1, 2018: Materials
https://www.readbyqxmd.com/read/29285428/prognostic-performance-of-combined-use-of-high-sensitivity-troponin-t-and-creatine-kinase-mb-isoenzyme-in-high-cardiovascular-risk-patients-with-end-stage-renal-disease
#13
Khaled Abdul-Aziz Ahmed, Wahda Mohammed Al-Attab
Background: The principal goal of this study was to determine the importance of high-sensitivity troponin T (hs-TnT) and creatine kinase MB isoenzyme (CK-MB) in predicting cardiovascular events in asymptomatic end-stage renal disease (ESRD) patients. Methods: This study included 110 participants; 54 ESRD patients undergoing hemodialysis and 56 healthy control participants. Biochemical parameters and cardiac markers were estimated. Comparative utilities were assessed through logistic regression and receiver operating characteristic (ROC) analyses...
December 2017: Kidney Research and Clinical Practice
https://www.readbyqxmd.com/read/29281650/explosive-detonation-causes-an-increase-in-soil-porosity-leading-to-increased-tnt-transformation
#14
Holly A Yu, Niamh Nic Daeid, Lorna A Dawson, David A DeTata, Simon W Lewis
Explosives are a common soil contaminant at a range of sites, including explosives manufacturing plants and areas associated with landmine detonations. As many explosives are toxic and may cause adverse environmental effects, a large body of research has targeted the remediation of explosives residues in soil. Studies in this area have largely involved spiking 'pristine' soils using explosives solutions. Here we investigate the fate of explosives present in soils following an actual detonation process and compare this to the fate of explosives spiked into 'pristine' undetonated soils...
2017: PloS One
https://www.readbyqxmd.com/read/29280043/cardiac-biomarkers-for-early-detection-and-prediction-of-trastuzumab-and-or-lapatinib-induced-cardiotoxicity-in-patients-with-her2-positive-early-stage-breast-cancer-a-neoaltto-sub-study-big-1-06
#15
Noam Ponde, Ian Bradbury, Matteo Lambertini, Michael Ewer, Christine Campbell, Helene Ameels, Dimitrios Zardavas, Serena Di Cosimo, José Baselga, Jens Huober, Miguel Izquierdo, Debora Fumagalli, Ivana Bozovic-Spasojevic, Marion Maetens, Nadia Harbeck, Lajos Pusztai, Michael Berghorn, Young-Hyuck Im, Manuel Ruiz Borrego, Dar-Ren Chen, Richard Rodeheffer, Martine Piccart, Thomas Suter, Evandro de Azambuja
BACKGROUND: Biomarkers of cardiac damages, such as troponin T (TnT) and the amino-terminal fragment of brain natriuretic peptide (NT-proBNP), may be useful as early predictors of cardiac dysfunction. The role of these biomarkers in patients receiving lapatinib and/or trastuzumab before anthracyclines is unknown. This study explores TnT and NT-proBNP as predictors of early cardiac toxicity in neoadjuvant breast cancer patients. METHODS: This sub-study of the NEOALTTO trial tested if changes in the levels of TnT and NT-proBNP occurred after 2 weeks of anti-HER2 therapy (lapatinib, trastuzumab or their combination) alone and/or after 18 weeks of anti-HER2 therapy plus weekly paclitaxel...
December 27, 2017: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/29258284/pure-and-highly-nb-doped-titanium-dioxide-nanotubular-arrays-characterization-of-local-surface-properties
#16
Monika Kwoka, Vardan Galstyan, Elisabetta Comini, Jacek Szuber
This paper presents the results of studies of the local surface properties of pure and highly Nb-doped (12 wt %) TiO₂ nanotubes (TNT) using the X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) methods, respectively. XPS analysis showed that the pure TNT exhibit an evident over-stoichiometry combined with high level of undesired C contaminations, which was confirmed by the relative concentration of specific elements O, Ti and C (with respect to all the surface atoms) equal to 0...
December 18, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29228170/biotransformation-of-trinitrotoluene-by-citrobacter-sp-yc4-and-evaluation-of-its-cyto-toxicological-effects
#17
Chih-Ming Kao, Shih-Feng Wei, Ssu Ching Chen, Chao-Ling Yao, Cheng Ma, Chih-Ching Chien
Trinitrotoluene (TNT) is an explosive chemical generally used for military, civil and industrial purposes. Therefore, TNT residue can be found in soil and ground water as an environmental pollutant. The environmental control of TNT pollution has become a critical issue because of its potential toxicity and carcinogenicity. The aim of this study is to evaluate the cyto-toxicological effects of TNT after bioremediation. Citrobacter sp. YC4 is able to utilize TNT as a sole nitrogen source. Citrobacter sp. YC4 cells grown in medium with TNT as the sole nitrogen source (TNT-N) were able to rapidly degrade TNT, in contrast to cells grown in Luria Bertani medium as determined by resting cell suspension...
December 6, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29222096/aerobic-transformation-of-2-4-dinitrotoluene-by-escherichia-coli-and-its-implications-for-the-detection-of-trace-explosives
#18
Benjamin Shemer, Sharon Yagur-Kroll, Carina Hazan, Shimshon Belkin
DNT (2,4-dinitrotoluene), a volatile impurity in military grade TNT-based explosives, is a potential tracer for the detection of buried landmines and other explosive devices. We have previously described an Escherichia coli bioreporter strain engineered to detect traces of DNT, and have demonstrated that the yqjF gene promoter, the sensing element of this bioreporter, is induced not by DNT but by at least one of its transformation products. In the present study we have characterized the initial stages of DNT biotransformation in E...
December 8, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29217433/hypertrophic-cardiomyopathy-linked-mutation-in-troponin-t-causes-myofibrillar-disarray-and-pro-arrhythmic-action-potential-changes-in-human-ipsc-cardiomyocytes
#19
Lili Wang, Kyungsoo Kim, Shan Parikh, Adrian Gabriel Cadar, Kevin R Bersell, Huan He, Jose R Pinto, Dmytro O Kryshtal, Bjorn C Knollmann
BACKGROUND: Mutations in cardiac troponin T (TnT) are linked to increased risk of ventricular arrhythmia and sudden death despite causing little to no cardiac hypertrophy. Studies in mice suggest that the hypertrophic cardiomyopathy (HCM)-associated TnT-I79N mutation increases myofilament Ca sensitivity and is arrhythmogenic, but whether findings from mice translate to human cardiomyocyte electrophysiology is not known. OBJECTIVES: To study the effects of the TnT-I79N mutation in human cardiomyocytes...
December 4, 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/29212136/explosive-detection-using-a-novel-dielectric-barrier-discharge-ionisation-source-for-mass-spectrometry
#20
Carl Fletcher, Richard Sleeman, John Luke, Peter Luke, James W Bradley
The detection of explosives is of great importance, as is the need for sensitive, reliable techniques that require little or no sample preparation and short run times for high throughput analysis. In this work, a novel ionisation source is presented based on a dielectric barrier discharge (DBD). This not only effects desorption and ionisation, but also forms an ionic wind, providing mass transportation of ions towards the mass spectrometer. Furthermore, the design incorporates two asymmetric alumina sheets, each containing three DBDs, so that a large surface area can be analysed...
December 6, 2017: Journal of Mass Spectrometry: JMS
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