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https://www.readbyqxmd.com/read/28929235/comparative-studies-on-structures-mechanical-properties-sensitivity-stabilities-and-detonation-performance-of-cl-20-tnt-cocrystal-and-composite-explosives-by-molecular-dynamics-simulation
#1
Gui-Yun Hang, Wen-Li Yu, Tao Wang, Jin-Tao Wang, Zhen Li
To investigate and compare the differences of structures and properties of CL-20/TNT cocrystal and composite explosives, the CL-20/TNT cocrystal and composite models were established. Molecular dynamics simulations were performed to investigate the structures, mechanical properties, sensitivity, stabilities and detonation performance of cocrystal and composite models with COMPASS force field in NPT ensemble. The lattice parameters, mechanical properties, binding energies, interaction energy of trigger bond, cohesive energy density and detonation parameters were determined and compared...
September 19, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28923663/modulation-of-the-picosecond-dynamics-of-troponin-by-the-cardiomyopathy-causing-mutation-k247r-of-troponin-t-observed-by-quasielastic-neutron-scattering
#2
Tatsuhito Matsuo, Taiki Tominaga, Fumiaki Kono, Kaoru Shibata, Satoru Fujiwara
Troponin (Tn), consisting of three subunits (TnC, TnI, and TnT), regulates cardiac muscle contraction in a Ca(2+)-dependent manner. Various point mutations of human cardiac Tn are known to cause familial hypertrophic cardiomyopathy due to aberration of the regulatory function. In this study, we investigated the effects of one of these mutations, K247R of TnT, on the picosecond dynamics of the Tn core domain (Tn-CD), consisting of TnC, TnI and TnT2 (183-288 residues of TnT), by carrying out the quasielastic neutron scattering measurements on the reconstituted Tn-CD containing either the wild-type TnT2 (wtTn-CD) or the mutant TnT2 (K247R-Tn-CD) in the absence and presence of Ca(2+)...
September 15, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28914821/biocompatibility-of-titania-nanotube-coatings-enriched-with-silver-nanograins-by-chemical-vapor-deposition
#3
Piotr Piszczek, Żaneta Lewandowska, Aleksandra Radtke, Tomasz Jędrzejewski, Wiesław Kozak, Beata Sadowska, Magdalena Szubka, Ewa Talik, Fabrizio Fiori
Bioactivity investigations of titania nanotube (TNT) coatings enriched with silver nanograins (TNT/Ag) have been carried out. TNT/Ag nanocomposite materials were produced by combining the electrochemical anodization and chemical vapor deposition methods. Fabricated coatings were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The release effect of silver ions from TNT/Ag composites immersed in bodily fluids, has been studied using inductively coupled plasma mass spectrometry (ICP-MS)...
September 15, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28906241/tracking-of-noise-tolerance-to-measure-hearing-aid-benefit
#4
Francis Kuk, Eric Seper, Chi-Chuen Lau, Petri Korhonen
BACKGROUND: The benefits offered by noise reduction (NR) features on a hearing aid had been studied traditionally using test conditions that set the hearing aids into a stable state of performance. While adequate, this approach does not allow the differentiation of two NR algorithms that differ in their timing characteristics (i.e., activation and stabilization time). PURPOSE: The current study investigated a new method of measuring noise tolerance (Tracking of Noise Tolerance [TNT]) as a means to differentiate hearing aid technologies...
September 2017: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/28899748/biomonitoring-of-2-4-6-trinitrotoluene-and-degradation-products-in-the-marine-environment-with-transplanted-blue-mussels-m-edulis
#5
Jennifer S Strehse, Daniel Appel, Catharina Geist, Hans-Jörg Martin, Edmund Maser
Since World War I considerable amounts of warfare material have been dumped at sea worldwide, but little is known about the fate of the explosive components in the marine environment. Sea dumped munitions are able to contaminate the surroundings because of the release of explosive chemicals due to corrosion and breaching or by detonation after blast-operations. This implies the risk of accumulation of toxic compounds in human and wildlife food chains. With the help of divers, we performed an active biomonitoring study with transplanted blue mussels (M...
September 9, 2017: Toxicology
https://www.readbyqxmd.com/read/28874244/the-interplay-between-fasting-glucose-echocardiography-and-biomarkers-pathophysiological-considerations-and-prognostic-implications
#6
Manan Pareek
BACKGROUND: Traditional cardiovascular risk stratification tools that employ clinical risk factors are limited by their modest discriminative abilities. As such, robust cardiovascular risk assessment, including our understanding of the complex interplay between risk factors, in the primary preventive setting, remains incomplete. Phenotypical heterogeneity may be even greater among subjects with hyperglycemic conditions, i.e., prediabetes and diabetes, which is worrisome, given the dramatic global rise in mean fasting glucose levels, and the strong association with adverse cardiovascular outcomes...
September 2017: Danish Medical Journal
https://www.readbyqxmd.com/read/28866639/over-expression-of-mirna-9-generates-muscle-hypercontraction-through-translational-repression-of-the-troponin-t-in-drosophila%C3%A2-indirect-flight-muscles
#7
Prasanna Katti, Divesh Thimmaya, Aditi Madan, Upendra Nongthomba
miRNAs are small non-coding endogenous RNAs, typically 21-23 nucleotides long, that regulate gene expression, usually post-transcriptionally by binding to the 3'-UTR of target mRNA, thus blocking translation. The expression of several miRNAs is significantly altered during cardiac hypertrophy, myocardial ischemia, fibrosis, heart failure and other cardiac myopathies. Recent studies have implicated miR-9 in myocardial hypertrophy. However a detailed mechanism remains obscure. In this study, we have addressed the roles of miR-9 in muscle development and function using the genetically tractable model system, the indirect flight muscles (IFMs) of Drosophila melanogaster Bioinformatics analysis identified 135 potential miR-9a targets, of which 27 genes were associated with Drosophila muscle development...
September 2, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28864370/pro-brain-natriuretic-peptide-and-troponin-t-hypersensitivity-levels-correlate-with-the-severity-of-liver-dysfunction-in-liver-cirrhosis
#8
Jiancheng Zhao, Sai Li, Linan Ren, Xiaozhong Guo, Xingshun Qi
BACKGROUND: Increased pro-brain natriuretic peptide (pro-BNP) or troponin T-hypersensitivity (TnT-HSST) levels are common in liver cirrhosis. We conducted a retrospective observational study aimed to evaluate the correlation of pro-BNP and TnT-HSST levels with the clinical characteristics, laboratory data and in-hospital outcomes of patients with liver cirrhosis. MATERIALS AND METHODS: We selected cirrhotic patients admitted to our hospital between January 2011 and June 2014...
August 2017: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/28852810/label-free-peptide-aptamer-based-impedimetric-biosensor-for-highly-sensitive-detection-of-tnt-with-a-ternary-assembly-layer
#9
Yanyan Li, Manru Zhao, Haiyan Wang
We report a label-free peptide aptamer based biosensor for highly sensitive detection of TNT which was designed with a ternary assembly layer consisting of anti-TNT peptide aptamer (peptamer), dithiothreitol (DTT), and 6-mercaptohexanol (MCH), forming Au/peptamer-DTT/MCH. A linear relationship between the change in electron transfer resistance and the logarithm of the TNT concentration from 0.44 to 18.92 pM, with a detection limit of 0.15 pM, was obtained. In comparison, the detection limit of the aptasensor with a common binary assembly layer (Au/peptamer/MCH) was 0...
August 29, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28846565/swimming-training-reduces-neuroma-pain-by-regulating-neurotrophins
#10
Tian Jinge, Zhang Xin, Yu Tingting, Xu Yongming, Pu Shaofeng, Lv Yingying, Du Dongping
INTRODUCTION: Neuroma formation after peripheral nerve transection leads to severe neuropathic pain in amputees. Previous studies suggested physical exercise could bring beneficial effect on alleviating neuropathic pain. Yet the effect of exercise on neuroma pain still remained unclear. In addition, long-term exercise can affect the expression of neurotrophins (NTs), such as nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF), which play key roles in nociceptor sensitization and nerve sprouting following nerve injury...
August 25, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28845964/array-based-rational-design-of-short-peptide-probe-derived-from-an-anti-tnt-monoclonal-antibody
#11
Mina Okochi, Masaki Muto, Kentaro Yanai, Masayoshi Tanaka, Takeshi Onodera, Jin Wang, Hiroshi Ueda, Kiyoshi Toko
Complementarity-determining regions (CDRs) are sites on the variable chains of antibodies responsible for binding to specific antigens. In this study, a short peptide probe for recognition of 2,4,6-trinitrotoluene (TNT), was identified by testing sequences derived from the CDRs of an anti-TNT monoclonal antibody. The major TNT-binding site in this antibody was identified in the heavy chain CDR3 by antigen docking simulation and confirmed by an immunoassay using a spot-synthesis based peptide array comprising amino acid sequences of six CDRs in the variable region...
August 28, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28842439/hypertrophic-cardiomyopathy-mutation-in-cardiac-troponin-t-r95h-attenuates-length-dependent-activation-in-guinea-pig-cardiac-muscle-fibers
#12
Alexis V Mickelson, Murali Chandra
The central region of cardiac troponin T (TnT) is important for modulating the dynamics of muscle length-mediated crossbridge recruitment. Therefore, hypertrophic cardiomyopathy mutations in the central region may affect crossbridge recruitment dynamics to alter myofilament Ca(2+) sensitivity and length-dependent activation of cardiac myofilaments. Given the importance of the central region of TnT for cardiac contractile dynamics, we studied if the hypertrophic cardiomyopathy-linked mutaton (TnTR94H)-induced effects on contractile function would be differently modulated by sarcomere length (SL)...
August 25, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28841986/indirect-determination-of-pentaerythritol-tetranitrate-petn-with-a-gold-nanoparticles-based-colorimetric-sensor
#13
Ayşem Üzer, Uğur Yalçın, Ziya Can, Erol Erçağ, Reşat Apak
Pentaerythritol tetranitrate (PETN) is the nitrate ester of pentaerythritol, used as an energetic and filling material for military and civilian purposes and rarely for terrorist actions. As there is no reliable nano-colorimetric method for PETN assay, we developed an indirect method based on the determination of nitrite, obtained by reduction of nitrate derived from the alkaline hydrolysis of PETN with H2O2. We colorimetrically determined the final product, nitrite, by both conventional Griess reaction and a recently developed gold nanoparticle-4-aminothiophenol-N-(1-naphthyl)-ethylenediamine (AuNP-4-ATP+NED) method...
December 1, 2017: Talanta
https://www.readbyqxmd.com/read/28830468/prediction-of-future-cardiovascular-disease-with-an-equation-to-estimate-apolipoprotein-b-in-patients-with-high-cardiovascular-risk-an-analysis-from-the-tnt-and-ideal-study
#14
You-Cheol Hwang, Hong-Yup Ahn, Ki Hoon Han, Sung-Woo Park, Cheol-Young Park
BACKGROUND: Apolipoprotein B (apoB) is known to be a more powerful predictor of cardiovascular disease than conventional lipids. We aimed to determine the clinical relevance of a newly developed equation to estimate serum apoB levels based on total cholesterol, HDL cholesterol, and triglycerides in patients with high cardiovascular risk. METHODS: The occurrence of a major cardiovascular event (MCVE) was assessed using the data from the Treating to New Targets (TNT) and Incremental Decrease in End points through Aggressive Lipid lowering (IDEAL) trials...
August 22, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/28819224/the-role-of-rho-gtpases-and-actin-polymerization-during-macrophage-tunneling-nanotube-biogenesis
#15
Samer J Hanna, Kessler McCoy-Simandle, Veronika Miskolci, Peng Guo, Michael Cammer, Louis Hodgson, Dianne Cox
Macrophage interactions with other cells, either locally or at distances, are imperative in both normal and pathological conditions. While soluble means of communication can transmit signals between different cells, it does not account for all long distance macrophage interactions. Recently described tunneling nanotubes (TNTs) are membranous channels that connect cells together and allow for transfer of signals, vesicles, and organelles. However, very little is known about the mechanism by which these structures are formed...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818710/multivariate-soil-fertility-relationships-for-predicting-the-environmental-persistence-of-2-4-6-trinitrotoluene-tnt-and-1-3-5-trinitro-1-3-5-tricyclohexane-rdx-among-taxonomically-distinct-soils
#16
Chelsea K Katseanes, Mark A Chappell, Bryan G Hopkins, Brian D Durham, Cynthia L Price, Beth E Porter, Lesley F Miller
After nearly a century of use in numerous munition platforms, TNT and RDX contamination has turned up largely in the environment due to ammunition manufacturing or as part of releases from low-order detonations during training activities. Although the basic knowledge governing the environmental fate of TNT and RDX are known, accurate predictions of TNT and RDX persistence in soil remain elusive, particularly given the universal heterogeneity of pedomorphic soil types. In this work, we proposed overcoming this problem by considering the environmental persistence of these munition constituents (MC) as multivariate mathematical functions over a variety of taxonomically distinct soil types, instead of a single constant or parameter of a specific absolute value...
August 14, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28811603/2-4-6-trinitrotoluene-induces-apoptosis-via-ros-regulated-mitochondrial-dysfunction-and-endoplasmic-reticulum-stress-in-hepg2-and-hep3b-cells
#17
Hung-Yu Liao, Chih-Ming Kao, Chao-Ling Yao, Po-Wei Chiu, Chun-Chen Yao, Ssu-Ching Chen
2,4,6-trinitrotoluene (TNT) has been reported to cause numerous adverse effects. However, the detailed molecular mechanisms underlying TNT-induced liver toxicity need to be elucidated. In this study, we used HepG2 (p53wt) and Hep3B (p53null) cell lines to investigate the cytotoxic effects of TNT. At first, we found that TNT significantly decreased cell viability and induced DNA damage. Thereafter, through transcriptomic analysis, we observed that the diverse biological functions affected included mitochondrial dysfunction and endoplasmic reticulum (ER) stress...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28805729/systems-biology-approach-to-bioremediation-of-nitroaromatics-constraint-based-analysis-of-2-4-6-trinitrotoluene-biotransformation-by-escherichia-coli
#18
Maryam Iman, Tabassom Sobati, Yunes Panahi, Meysam Mobasheri
Microbial remediation of nitroaromatic compounds (NACs) is a promising environmentally friendly and cost-effective approach to the removal of these life-threating agents. Escherichia coli (E. coli) has shown remarkable capability for the biotransformation of 2,4,6-trinitro-toluene (TNT). Efforts to develop E. coli as an efficient TNT degrading biocatalyst will benefit from holistic flux-level description of interactions between multiple TNT transforming pathways operating in the strain. To gain such an insight, we extended the genome-scale constraint-based model of E...
August 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28791842/dialysis-vintage-and-cardiovascular-injury-as-factors-influencing-long-term-survival-in-peritoneal-dialysis-and-hemodialysis
#19
Krzysztof Hoppe, Krzysztof Schwermer, Anna Olewicz-Gawlik, Patrycja Klysz, Anna Kawka, Ewa Baum, Dorota Sikorska, Katarzyna Ścigacz, Magdalena Roszak, Bengt Lindholm, Krzysztof Pawlaczyk, Andrzej Oko
BACKGROUND: Cardiovascular (CV) incidents are the major cause of mortality in maintenance dialysis (MD) patients undergoing peritoneal dialysis (PD) or hemodialysis (HD). CV injury indicators may be useful to investigate the dialysis modality influence on survival. OBJECTIVES: The aim of this study was to compare selected laboratory and echocardiographic (ECHO) markers of CV injury in terms of dialysis vintage (DV), CV-related mortality and all-cause mortality. MATERIAL AND METHODS: The study involved 301 patients on HD (n = 301) and PD (n = 58), who were divided into subgroups according to DV...
March 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28783323/3d-printed-electrodes-for-detection-of-nitroaromatic-explosives-and-nerve-agents
#20
Cavin Tan, Muhammad Zafir Mohamad Nasir, Adriano Ambrosi, Martin Pumera
Three-dimensional (3D) printing has proven to be a versatile and useful technology for specialized applications in industry and also for scientific research. We demonstrate its potential use toward the electrochemical detection of nitroaromatic compounds 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (DNT), and fenitrothion (FT). The detection of these compounds is of utmost importance in military and forensic applications. Stainless steel electrodes were fabricated by 3D printing, and the surface was electroplated with gold...
September 5, 2017: Analytical Chemistry
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