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https://www.readbyqxmd.com/read/29778954/ionizing-radiation-and-taxonomic-functional-and-evolutionary-diversity-of-bird-communities
#1
Federico Morelli, Yanina Benedetti, Timothy A Mousseau, Anders Pape Møller
Ionizing radiation from nuclear accidents at Chernobyl, Fukushima and elsewhere has reduced the abundance, species richness and diversity of ecosystems. Here we analyzed the taxonomic, functional and evolutionary diversity of bird communities in forested areas around Chernobyl. Species richness decreased with increasing radiation, mainly in 2007. Functional richness, but not functional evenness and divergence, decreased with increasing level of ionizing radiation. Evolutionary distinctiveness of bird communities was higher in areas with higher levels of ionizing radiation...
May 17, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29778890/dual-photoacoustic-ultrasound-multi-parametric-imaging-from-passion-fruit-like-nano-architectures
#2
Paolo Armanetti, Salvador Pocoví-Martínez, Alessandra Flori, Cinzia Avigo, Domenico Cassano, Luca Menichetti, Valerio Voliani
Ultrasound (US) imaging is a well-established diagnostic technique to image soft tissues in real time, while photoacoustic (PA) is an emerging imaging technique employed to collect molecular information. Integration of PA and US imaging provides complementary information enhancing diagnostic accuracy without employing ionizing radiations. The development of contrast agents able to combine PA and US features is pivotal to improve the significance of PAUS imaging and for PAUS-guided treatment of neoplasms. Here, we demonstrate in relevant ex-vivo models that disassembling passion fruit-like nano-architectures (pfNAs) can be employed in PAUS imaging...
May 17, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/29778874/simultaneous-determination-of-dihydrotestosterone-and-its-metabolites-in-mouse-sera-by-lc-ms-ms-with-chemical-derivatization
#3
Shashank Gorityala, Shuming Yang, Monica M Montano, Yan Xu
Androgens play a vital role in prostate cancer development, and their elimination and blockade are essential in the disease management. DHT is the key ligand for androgen receptor (AR) in the prostate. It is locally synthesized from testosterone. In the prostate, DHT is predominantly metabolized to α-diol and β-diol. Recent studies indicate that impaired DHT catabolism is associated with prostate cancer, signifying the necessity of a sensitive quantitative method for the determination of DHT and its metabolites...
May 16, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29778815/photodegradation-of-atrazine-in-the-presence-of-indole-3-acetic-acid-and-natural-montmorillonite-clay-minerals
#4
Lin Zhang, Haoting Tian, Ran Hong, Chao Wang, Yi Wang, Anping Peng, Cheng Gu
Atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) is a commonly used agricultural herbicide that, as a result, is frequently detected in surface and ground water. In this study, we provide evidence of the photo-oxidation of atrazine under environmentally relevant conditions, specifically, in the presence of natural montmorillonite clay and the ubiquitous phytohormone indole-3-acetic acid (IAA). The reaction is initiated by the generation of hydrated electrons from the photo-ionization of IAA. These electrons react with protons and dissolved oxygen to form hydroxyl radicals, which promote the further degradation of atrazine...
May 17, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29778412/assessing-cancer-risk-factors-faced-by-an-ancestral-puebloan-population-in-the-north-american-southwest
#5
Catrina Banks Whitley, Jeffrey L Boyer
Ancestral Puebloan people in the North American Southwest suffered high rates of disease, poor health, and early age-at-death. Four individuals with skeletal expressions of cancer were found in a pre-Columbian population in the Taos Valley - Reports of malignant neoplasms in the archaeological record are uncommon and their presence in four of 82 individuals is a high occurrence. This study continues Whitley and Boyer's (2012) research testing whether concentrations of ionizing radiation were sufficiently high to induce cancer and related health issues...
August 23, 2017: International Journal of Paleopathology
https://www.readbyqxmd.com/read/29778162/mass-spectral-chemical-fingerprints-reveal-the-molecular-dependence-of-exhaust-particulate-matters-on-engine-speeds
#6
Yi Li, Hua Zhang, Zongshan Zhao, Yong Tian, Kun Liu, Feifan Jie, Liang Zhu, Huanwen Chen
Particulate matters (PMs) emitted by automobile exhaust contribute to a significant fraction of the global PMs. Extractive atmospheric pressure chemical ionization mass spectrometry (EAPCI-MS) was developed to explore the molecular dependence of PMs collected from exhaust gases produced at different vehicle engine speeds. The mass spectral fingerprints of the organic compounds embedded in differentially sized PMs (e.g., 0.22-0.45, 0.45-1.00, 1.00-2.00, 2.00-3.00, 3.00-5.00, and 5.00-10.00μm) generated at different engine speeds (e...
May 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29777832/novel-cysteine-and-albumin-adduct-biomarkers-to-prove-human-poisoning-with-the-pesticide-oxydemeton-s-methyl
#7
Harald John, Markus Siegert, Florian Eyer, Franz Worek, Horst Thiermann, Andreas Kranawetvogl
We herein report on the forensic analysis of plasma samples to prove human poisoning with oxydemeton-S-methyl (ODM), S-(2-(ethylsulfinyl)ethyl)-O,O-dimethyl phosphorothioate. This organophosphorus pesticide is the active ingredient of Metasystox® , that was swallowed by a 77-year-old woman to commit suicide. ODM belongs to the class of dimethyl phosphoryl (DMP) pesticides, contains a 2-(ethylsulfinyl)ethanethiol (ESOET) leaving group and undergoes adduct formation with endogenous molecules as elaborated herein with human serum exposed to pesticides in vitro...
May 16, 2018: Toxicology Letters
https://www.readbyqxmd.com/read/29776659/response-of-rats-to-dose-rates-of-ionizing-radiation-evaluated-by-dielectric-properties-of-bone-marrow
#8
REVIEW
Azhar M Elwan, Aida A Salama, Abdelbaset M Sayed, Ahmad M Ghoneim, Aziza A Assaied, Fatma A Ibrahim, Hany A Shousha, Mohamed M M Elnasharty
The response of adult Wistar albino female rats toward two dose rates of gamma radiation delivered as acute dose of 7 Gy is investigated using classical methodologies as chemical, hematological and histological parameters in comparison with newly introduced dielectric parameters. Two groups of rats were exposed to γ ray with dose rates 533.35 mGy/min and 325.89 mGy/min. Then the irradiated groups were followed up for two weeks after irradiation. In case of higher dose rate, high percentage of animals was lost and there were substantial alterations in the dielectric parameters in addition to massive damage in liver and bone marrow cells...
May 10, 2018: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/29776536/rapid-profiling-and-quantification-of-phospholipid-molecular-species-in-human-plasma-based-on-chemical-derivatization-coupled-with-electrospray-ionization-tandem-mass-spectrometry
#9
Fang Wei, Xiang Wang, Hui-Fang Ma, Xin Lv, Xu-Yan Dong, Hong Chen
In this study, we developed a novel strategy using solid-phase extraction (SPE) coupled with shotgun mass spectrometry (MS) based on trimethylsilyldiazomethane (TMSCHN2 ) stable-isotope derivatization for rapid profiling and accurate quantification of phospholipids (PLs) in human plasma. HybridSPE-Phospholipid (HybridSPE-PL, zirconia coated silica stationary phase) was used for sample pretreatment via the Lewis acid-base interaction between zirconia and phosphate moiety of PLs. This step allows rapid enrichment and recovery of PLs from human plasma...
September 18, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29776454/determination-of-three-chromium-textile-azo-dyes-in-wastewater-by-spe-lc-esi-ms-ms
#10
Florina-Maria Copaciu, Dorina Simedru, Maria-Virginia Coman
In the present work, a procedure to determine three textile azo dyes, chromium-complexes [Nylosan Dark Brown (NDB), Lanasyn Dark Brown (LDB), and Lanasyn Red (LR)], from wastewater using solid-phase extraction (SPE) followed by LC-electrospray ionization negative mode tandem mass spectrometry (LC-ESI(-)-MS/MS) has been developed. The extraction/concentration and recovery degree of these dyes from liquid matrices were done on Strata WAX/NH₂ cartridges. The chromatographic separation was performed using a Luna C18 (2) 100Å column by isocratic elution with a methanol-acetonitrile-water (0...
May 18, 2018: Journal of AOAC International
https://www.readbyqxmd.com/read/29776363/rapid-detection-of-carbapenemase-activity-of-enterobacteriaceae-isolated-from-positive-blood-cultures-by-maldi-tof-ms
#11
Jiajia Yu, Jingxian Liu, Yuanrui Li, Jing Yu, Weinan Zhu, Ying Liu, Lisong Shen
BACKGROUND: Matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) has been proved to be a useful tool for identification of pathogens directly isolated from blood cultures in clinical microbiology laboratories. β-Lactam antibiotics are commonly used for treatment of bloodstream infections caused by Enterobacteriaceae strains, and carbapenem is the superlative class of β-lactam antibiotics. Since the carbapenem resistance rate of Enterobacteriaceae strains raised year by year, efficient detection of carbapenemase activity and timely delivery of carbapenem susceptibility reports of Enterobacteriaceae strains isolated from blood cultures is important for clinicians...
May 18, 2018: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/29776101/solvation-suppression-of-ion-recombination-in-gas-discharge-afterglow
#12
R Kh Amirov, A V Lankin, G E Norman
An effect which suppresses recombination in ion plasmas is considered both theoretically and experimentally. Experimental results are presented for the ion recombination rate in fluorine plasma, which are obtained from data for the gas discharge afterglow. To interpret them, a suppression factor is considered: ion solvation in weakly ionized plasma. It is shown that the recombination process has a two-stage character with the formation of intermediate metastable ion pairs. The pairs consist of negative and positive ion-molecular clusters...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29776024/simple-and-universal-model-for-electron-impact-ionization-of-complex-biomolecules
#13
Hong Qi Tan, Zhaohong Mi, Andrew A Bettiol
We present a simple and universal approach to calculate the total ionization cross section (TICS) for electron impact ionization in DNA bases and other biomaterials in the condensed phase. Evaluating the electron impact TICS plays a vital role in ion-beam radiobiology simulation at the cellular level, as secondary electrons are the main cause of DNA damage in particle cancer therapy. Our method is based on extending the dielectric formalism. The calculated results agree well with experimental data and show a good comparison with other theoretical calculations...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29775810/a-validated-uplc-ms-ms-method-for-the-quantitation-of-an-unstable-peptide-monocyte-locomotion-inhibitory-factor-mlif-in-human-plasma-and-its-application-to-a-pharmacokinetic-study
#14
Xuemei Liu, Pei Hu, Yongsheng Wang, Xizhu Wang, Jinghua Huang, Jin Li, Cheng Li, Hongyun Wang, Ji Jiang
Monocyte locomotion inhibitory factor (MLIF, Met-Gln-Cys-Asn-Ser), a pentapeptide with anti-inflammatory activity, was developed for neural protection in acute ischemic stroke. Determination of MLIF in human plasma samples is of great importance for pharmacokinetic evaluation in clinical studies. A reliable and sensitive method based on ultra-performance liquid chromatography coupled with tandem mass spectrometry (UPLC-MS/MS) was established for the measurement of MLIF in human plasma. Instability of peptide in matrix was the primary challenge in method development, which was properly resolved by addition of acidification reagents like sulfuric acid...
April 10, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29775706/purification-and-characterization-of-an-organic-solvent-tolerant-and-detergent-stable-lipase-from-haloferax-mediterranei-cncmm-50101
#15
Siham Akmoussi-Toumi, Souad Khemili-Talbi, Imen Ferioune, Salima Kebbouche-Gana
The present study investigates the purification and biochemical characterization of an extracellular lipase (HML) from Haloarchaea Haloferax mediterranei strain ATS1, isolated from the Sebkha (Medea, Algeria). The pure protein was obtained with ammonium sulfate precipitation (40-70%)-dialysis and UNO Q-6 FPLC, and characterized biochemically. Matrix assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF/MS) analysis revealed that the purified enzyme was a monomer, with a molecular mass of 45,011...
May 15, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29775613/suppression-of-nlrp3-inflammasome-attenuates-stress-induced-depression-like-behavior-in-nlgn3-deficient-mice
#16
Ze-Qun Li, Zhi-Yuan Yan, Bo-Jun Lan, Yi-Qun Dong, Ye Xiong
Depression, regulated by central nervous system (CNS), is a significant inflammatory disorder. Neuroligin3 (NLGN3) has been implicated in brain functions. In the study, a chronic unpredictable mild stress (CUMS) model in wild type (WT) or NLGN3-knockout (KO) mice was established to explore the role of NLGN3 in regulating depression and to reveal the underlying molecular mechanism. The results indicated that NLGN3-knockout markedly reversed the loss of body weight, the reduction of sucrose consumption, the decrease of immobile time in the forced swimming tests (FST) and tail suspension tests (TST) induced by CUMS paradigm...
May 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29775404/evaluation-of-chromosomal-aberrations-induced-by-188-re-dendrimer-nanosystem-on-b16f1-melanoma-cells
#17
Marcos Tassano, Natalia Oddone, Marcelo Fernández, Williams Porcal, María Fernanda García, Wilner Martínez, Juan Claudio Benech, Pablo Cabral
PURPOSE: Study of rhenium-188 labeling of polyamidoamine (PAMAM) generation 4 (G4) dendrimer and its evaluation on biodistribution and chromosomal aberrations in melanoma cells induced by ionizing radiation as potential treatment agent. MATERIALS AND METHODS: Dendrimers were first conjugated with Suc-HYNIC (Succinimidyl 6-hydrazinopyridine-3-carboxylic acid hydrochloride). Dendrimer-HYNIC was then incubated with 188 ReO4 - . Biodistribution were performed administrating 188 Re-dendrimer to normal (NM) or melanoma-bearing mice (MBM)...
May 18, 2018: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/29775402/a-note-on-poisson-goodness-of-fit-tests-for-ionizing-radiation-induced-chromosomal-aberration-samples
#18
Manuel Higueras, J E González, Marina Di Giorgio, J F Barquinero
PURPOSE: To present Poisson exact goodness-of-fit tests as alternatives and complements to the asymptotic u-test, which is the most widely used in cytogenetic biodosimetry, to decide whether a sample of chromosomal aberrations in blood cells comes from an homogeneous or inhomogeneous exposure. MATERIALS AND METHODS: Three Poisson exact goodness-of-fit test from the literature are introduced and implemented in the R environment. A Shiny R Studio application, named GOF Poisson, has been updated for the purpose of giving support to this work...
May 18, 2018: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/29775376/bound-electron-nonlinearity-beyond-the-ionization-threshold
#19
J K Wahlstrand, S Zahedpour, A Bahl, M Kolesik, H M Milchberg
We present absolute space- and time-resolved measurements of the ultrafast laser-driven nonlinear polarizability in argon, krypton, xenon, nitrogen, and oxygen up to ionization fractions of a few percent. These measurements enable determination of the strongly nonperturbative bound-electron nonlinear polarizability well beyond the ionization threshold, where it is found to remain approximately quadratic in the laser field, a result normally expected at much lower intensities where perturbation theory applies...
May 4, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29775363/charge-transfer-processes-in-warm-dense-matter-selective-spectral-filtering-for-laser-accelerated-ion-beams
#20
J Braenzel, M D Barriga-Carrasco, R Morales, M Schnürer
We investigate, both experimentally and theoretically, how the spectral distribution of laser accelerated carbon ions can be filtered by charge exchange processes in a double foil target setup. Carbon ions at multiple charge states with an initially wide kinetic energy spectrum, from 0.1 to 18 MeV, were detected with a remarkably narrow spectral bandwidth after they had passed through an ultrathin and partially ionized foil. With our theoretical calculations, we demonstrate that this process is a consequence of the evolution of the carbon ion charge states in the second foil...
May 4, 2018: Physical Review Letters
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