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https://www.readbyqxmd.com/read/30537672/plan-view-transmission-electron-microscopy-specimen-preparation-for-atomic-layer-materials-using-a-focused-ion-beam-approach
#1
Lan-Hsuan Lee, Chia-Hao Yu, Chuan-Yu Wei, Pei-Chin Lee, Jih-Shang Huang, Cheng-Yen Wen
Using the focused ion beam (FIB) to prepare plan-view transmission electron microscopy (TEM) specimens is beneficial for obtaining structural information of two-dimensional atomic layer materials, such as graphene and molybdenum disulfide (MoS2 ) nanosheets supported on substrates. The scanning electron microscopy (SEM) image in a dual-beam FIB-SEM can accurately locate an area of interest for specimen preparation. Besides, FIB specimen preparation avoids damages and hydrocarbon contamination that are usually produced in other preparation methods, in which chemical etching and polymer adhesion layers are used...
December 5, 2018: Ultramicroscopy
https://www.readbyqxmd.com/read/30537650/prediction-of-organic-contaminant-uptake-by-plants-modified-partition-limited-model-based-on-a-sequential-ultrasonic-extraction-procedure
#2
Xiang Wu, Lizhong Zhu
Predicting the translocation of organic contaminants to plants is crucial to ensure the quality of agricultural goods and assess the risk of human exposure through the food web. In this study, the performance of a modified plant uptake model was evaluated considering a number of chemicals, such as polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs) and polybrominated diphenyl ethers (PBDEs), with a range of physicochemical properties; different plant species (Ipomoea aquatica Forsk (swamp morning glory), Chrysanthemum coronarium L...
November 30, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/30537641/qspr-estimation-models-of-normal-boiling-point-and-relative-liquid-density-of-pure-hydrocarbons-using-mlr-and-mlp-ann-methods
#3
Mohamed Roubehie Fissa, Yasmina Lahiouel, Latifa Khaouane, Salah Hanini
This work aimed to predict the normal boiling point temperature (Tb) and relative liquid density (d20) of petroleum fractions and pure hydrocarbons, through a multi-layer perceptron artificial neural network (MLP-ANN) based on the molecular descriptors. A set of 223 and 222 diverse data points for Tb and d20 were respectively used to build two quantitative structure property relationships-artificial neural network (QSPR-ANN) models. For each model, the total database was divided respectively into two subsets: 80% for the training set and 20% for the test set...
November 29, 2018: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/30537625/in-vitro-profiling-of-volatile-organic-compounds-released-by-simpson-golabi-behmel-syndrome-adipocytes
#4
Paweł Mochalski, Eva Diem, Karl Unterkofler, Axel Mündlein, Heinz Drexel, Chris A Mayhew, Andreas Leiherer
Breath analysis offers a non-invasive and rapid diagnostic method for detecting various volatile organic compounds that could be indicators for different diseases, particularly metabolic disorders including type 2 diabetes mellitus. The development of type 2 diabetes mellitus is closely linked to metabolic dysfunction of adipose tissue and adipocytes. However, the VOC profile of human adipocytes has not yet been investigated. Gas chromatography with mass spectrometric detection and head-space needle trap extraction (two-bed Carbopack X/Carboxen 1000 needle traps) were applied to profile VOCs produced and metabolised by human Simpson Golabi Behmel Syndrome adipocytes...
November 28, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/30536759/compositional-elucidation-of-heavy-petroleum-base-oil-by-gc%C3%A3-gc-ei-pi-ci-fi-tofms
#5
Anupam Giri, Marion Coutriade, Amandine Racaud, Pierre-Hugues Stefanuto, Koji Okuda, John Dane, Robert B Cody, Jean-François Focant
Comprehensive two-dimensional gas chromatography (GC×GC) coupled to time-of-flight mass spectrometry is a powerful separation tool for complex petroleum product analysis. However, the most commonly used electron ionization (EI) technique often makes the identification of the majority of hydrocarbons impossible due to the exhaustive fragmentation and lack of molecular ion preservation, prompting the need of soft-ionization energies. In this study, three different soft-ionization techniques including photo ionization (PI), chemical ionization (CI), and field ionization (FI) were compared against EI to elucidate their relative capabilities to reveal different base oil hydrocarbon classes...
December 7, 2018: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/30535939/the-pattern-of-straight-chain-hydrocarbons-released-by-yucca-flowers-asparagaceae
#6
Armin Tröger, Glenn P Svensson, David M Althoff, Kari A Segraves, Robert A Raguso, Wittko Francke
The hydrocarbon pattern in the floral scent of Yucca species was found to comprise a group of unbranched, mid-chain alkanes, alkenes, and an alkadiene. In Y. reverchonii, highly dominant (Z)-8-heptadecene is accompanied by (6Z,9Z)-6,9-heptadecadiene and heptadecane as minor components and by traces of other saturated and unsaturated hydrocarbons with similar chain length. Some of these volatiles proved to be perceived by the antennae of Tegeticula cassandra (pollinating seed-eater of Yucca) and Prodoxus decipiens (herbivore on Yucca)...
December 10, 2018: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/30535732/interactive-effects-of-mixtures-of-phototoxic-pahs
#7
B E Finch, W A Stubblefield
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the environment as components in complex mixtures derived from petroleum based products. PAHs are unique in their ability to absorb UV light, resulting in significant increases in acute toxicity. The objective of this study was to determine if mixtures of the phototoxic PAHs fluoranthene, pyrene, and anthracene conform to the additive model of toxicity. Median lethal concentrations (LC50) were calculated for mysid shrimp (Americamysis bahia) and inland silverside (Menidia beryllina) exposed to individual, binary, and ternary mixtures of the selected PAHs...
December 10, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/30535508/prenatal-developmental-toxicity-testing-of-petroleum-substances-using-the-zebrafish-embryotoxicity-test
#8
Lenny Kamelia, Sylvia Brugman, Laura de Haan, Hans B Ketelslegers, Ivonne M C M Rietjens, Peter J Boogaard
The present study evaluates the applicability of the zebrafish embryotoxicity test (ZET) to assess prenatal developmental toxicity (PDT) potency of the DMSO-extracts of 9 petroleum substances (PS), with variable polycyclic aromatic hydrocarbon (PAH) content, and 2 gas-to-liquid (GTL) products, without any PAHs but otherwise similar properties to PS. The results showed that all PS extracts induced concentration-dependent in vitro PDT, as quantified in the ZET and that this potency is associated with their 3-5 ring PAH content...
December 7, 2018: ALTEX
https://www.readbyqxmd.com/read/30534789/optical-properties-of-pyridine-adsorbed-polycyclic-aromatic-hydrocarbons-using-quantum-chemical-calculations
#9
Junais Habeeb Mokkath
Polycyclic aromatic hydrocarbons (PAHs), the molecular version of graphene, having edges saturated with hydrogen atoms, have recently emerged as a novel nanoplasmonic material. In this work, we investigate the optical properties of pristine and pyridine adsorbed circular and triangular PAHs. We base our calculations on computationally efficient first-principles time-dependent density-functional theory (TD-DFT) calculations. We find substantial changes in the optical absorption spectra induced by the presence of the pyridine molecule...
December 10, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/30533873/draft-genome-sequence-of-microbacterium-esteraromaticum-mm1-a-bacterium-that-hydrolyzes-the-organophosphorus-pesticide-fenamiphos-isolated-from-golf-course-soil
#10
Logeshwaran Panneerselvan, Kannan Krishnan, Suresh R Subashchandrabose, Ravi Naidu, Mallavarapu Megharaj
In this study, we report the first draft genome sequence of Microbacterium esteraromaticum MM1, isolated from golf course soil in South Australia. The genome possesses genes for the hydrolysis of organophosphorus (OP) pesticides and polycyclic aromatic hydrocarbon (PAH) degradation.
August 2018: Microbiology resource announcements
https://www.readbyqxmd.com/read/30533787/complete-genome-sequence-of-the-hydrocarbon-degrading-strain-achromobacter-sp-b7-isolated-during-petroleum-hydrocarbon-bioremediation-in-the-valparaiso-region-chile
#11
Valentina Méndez, Lisette Hernández, Francisco Salvà-Serra, Daniel Jaén-Luchoro, Roberto E Durán, Bárbara Barra, Beatriz Piñeiro-Iglesias, Edward R B Moore, Michael Seeger
Achromobacter sp. strain B7 (= CCUG 72081) was isolated from a diesel-polluted soil from the Valparaiso Region, Chile, subjected to bioremediation with a hydrocarbon-degrading enrichment. The complete genome sequence of Achromobacter sp. B7 has been determined to have a size of 6.24 Mb, 5,578 coding sequences, 57 tRNAs, and a G+C content of 64.8%.
November 2018: Microbiology resource announcements
https://www.readbyqxmd.com/read/30533632/draft-genome-sequence-of-achromobacter-spanius-strain-6-a-soil-bacterium-isolated-from-a-hydrocarbon-degrading-microcosm
#12
Thusitha S Gunasekera, Osman Radwan, Loryn L Bowen, Lisa M Brown, Oscar N Ruiz
Achromobacter spanius strain 6 is a Gram-negative soil bacterium isolated from a hydrocarbon-degrading microcosm. The draft genome sequence of A. spanius strain 6 is 6.57 Mb with a G+C content of 64.7% and 5,855 protein coding genes. Multiple genes involved in degradation of aromatics are present in this strain.
September 2018: Microbiology resource announcements
https://www.readbyqxmd.com/read/30533631/complete-genome-sequence-of-marinobacterium-aestuarii-st58-10-t-a-benzene-degrading-bacterium-isolated-from-estuarine-sediment
#13
Kyunghwa Baek, Seung Seob Bae, Jaejoon Jung, Dawoon Chung
Marinobacterium aestuarii ST58-10T was identified as a benzene-degrading aerobic bacterium isolated from estuarine sediment in the Republic of Korea. The genome of strain ST58-10T was found to be composed of a single circular chromosome (5,191,608 bp) with a G+C content of 58.78% and harboring 4,473 protein-coding genes. The assembled sequence data will help elucidate potential metabolic pathways and mechanisms responsible for the hydrocarbon-degrading ability of M. aestuarii ST58-10T .
September 2018: Microbiology resource announcements
https://www.readbyqxmd.com/read/30531920/macromolecular-clustered-facial-amphiphilic-antimicrobials
#14
Md Anisur Rahman, Marpe Bam, Edgar Luat, Moumita Sharmin Jui, Mitra S Ganewatta, Tinom Shokfai, Mitzi Nagarkatti, Alan W Decho, Chuanbing Tang
Bacterial infections and antibiotic resistance, particularly by Gram-negative pathogens, have become a global healthcare crisis. We report the design of a class of cationic antimicrobial polymers that cluster local facial amphiphilicity from repeating units to enhance interactions with bacterial membranes without requiring a globally conformational arrangement associated with highly unfavorable entropic loss. This concept of macromolecular architectures is demonstrated with a series of multicyclic natural product-based cationic polymers...
December 7, 2018: Nature Communications
https://www.readbyqxmd.com/read/30530162/urinary-concentrations-of-monohydroxylated-polycyclic-aromatic-hydrocarbons-in-adults-from-the-u-s-population-assessment-of-tobacco-and-health-path-study-wave-1-2013-2014
#15
Yuesong Wang, Lee-Yang Wong, Lei Meng, Erin N Pittman, Debra A Trinidad, Kendra L Hubbard, Alisha Etheredge, Arseima Y Del Valle-Pinero, Rachel Zamoiski, Dana M van Bemmel, Nicolette Borek, Vyomesh Patel, Heather L Kimmel, Kevin P Conway, Charles Lawrence, Kathryn C Edwards, Andrew Hyland, Maciej L Goniewicz, Dorothy Hatsukami, Stephen S Hecht, Antonia M Calafat
BACKGROUND: Polycyclic aromatic hydrocarbons (PAHs) are environmental pollutants formed from incomplete combustion of organic matter; some PAHs are carcinogens. Smoking, diet, and other activities contribute to exposure to PAHs. Exposure data to PAHs among combustible tobacco product users (e.g. cigarette smokers) exist; however, among non-combustible tobacco products users (e.g., e-cigarette users), such data are rather limited. OBJECTIVES: We sought to evaluate exposure to PAHs among participants in Wave 1 (2013-2014) of the Population Assessment of Tobacco and Health (PATH) Study based on the type of tobacco product (combustible vs non-combustible), and frequency and intensity of product use...
December 6, 2018: Environment International
https://www.readbyqxmd.com/read/30530140/body-burden-of-organohalogenated-pollutants-and-polycyclic-aromatic-hydrocarbons-in-romanian-population-influence-of-age-gender-body-mass-index-and-habitat
#16
Octavio P Luzardo, Mihaela Badea, Manuel Zumbado, Liliana Rogozea, Laura Floroian, Anca Ilea, Marius Moga, Gabriela Sechel, Luis D Boada, Luis Alberto Henríquez-Hernández
Persistent organochlorine pollutants (POPs) are highly lipophilic and resistant to degradation, hence these substances are commonly found in the environment even decades after their prohibition. The aim of the present study was to determine human serum concentrations of POPs and polycyclic aromatic hydrocarbons (PAHs) in the Romanian population, investigating the role of demographic variables on the body burden of such chemicals. A cross-sectional study including a total of 121 subjects from Brasov (Transylvania region) was designed...
November 29, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30530128/bioenergy-generation-and-degradation-pathway-of-phenanthrene-and-anthracene-in-a-constructed-wetland-microbial-fuel-cell-with-an-anode-amended-with-nzvi
#17
Junfeng Wang, Xinshan Song, Qusheng Li, Heng Bai, Congyun Zhu, Baisha Weng, Denghua Yan, Junhong Bai
The frequent occurrence of polycyclic aromatic hydrocarbons (PAHs) in aquatic environments is of great concern because of their teratogenicity, toxicity, carcinogenicity, and mutagenicity to plants, animals and human beings. In this study the bioelectricity generation, biodegradation, phytoextraction and substrate adsorption of phenanthrene and anthracene in a constructed wetland-microbial fuel cell (CW-MFC) were investigated with an anode electrode amended with or without biochar-nZVI. During a 182-day operation period, the average removal efficiency for phenanthrene and anthracene ranged from 88...
November 30, 2018: Water Research
https://www.readbyqxmd.com/read/30530025/benzo-a-pyrene-degradation-by-cytochrome-p450-hydroxylase-and-the-functional-metabolism-network-of-bacillus-thuringiensis
#18
Qiying Lu, Kaiyun Chen, Yan Long, Xujun Liang, Baoyan He, Lehuan Yu, Jinshao Ye
The relationship between benzo(a)pyrene biodegradation and certain target biomolecules has been investigated. To regulate the degradation process, the associated metabolism network must be clarified. To this end, benzo(a)pyrene degradation, carbon substrate metabolism and exometabolomic mechanism of Bacillus thuringiensis were analyzed. Benzo(a)pyrene was degraded through hydroxylation catalyzed by cytochrome P450 hydroxylase. After the treatment of 0.5 mg L-1 of benzo(a)pyrene by 0.2 g L-1 of cells for 9 d, biosorption and degradation efficiencies were measured at approximately 90% and 80%, respectively...
December 3, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30529946/gene-expression-profiles-of-putative-biomarkers-in-juvenile-loggerhead-sea-turtles-caretta-caretta-exposed-to-polycyclic-aromatic-hydrocarbons
#19
Paolo Cocci, Gilberto Mosconi, Francesco Alessandro Palermo
There is evidence that polycyclic aromatic hydrocarbons (PAHs) are consistently the predominant organic contaminants in concentration found in loggerhead sea turtles (Caretta caretta) from the North and Central Adriatic Sea. Hence this study investigates the PAH toxicity to loggerheads by using a particular set of genes [i.e. CYP1B, CAT, GPX, GSTT1, SOD3, DNMT1, Epoxide hydrolase 1 (EPHX1), Poly (ADP-ribose) polymerase 1 (PARP1), Lamin-A/C isoform 3 (LMNA), Talin 1 (TLN1), Annexin A1 (ANXA1)] whose altered expression is potentially dependent on and specific for the PAH-related mechanism of action...
November 30, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/30529640/genome-analysis-provides-insights-into-crude-oil-degradation-and-biosurfactant-production-by-extremely-halotolerant-halomonas-desertis-g11-isolated-from-chott-el-djerid-salt-lake-in-tunisian-desert
#20
Mohamed Neifar, Habib Chouchane, Afef Najjari, Darine El Hidri, Mouna Mahjoubi, Kais Ghedira, Fatma Naili, Leila Soufi, Noura Raddadi, Haïtham Sghaier, Hadda I Ouzari, Ahmed Salaheddine Masmoudi, Ameur Cherif
Here, we report the genomic features and the bioremediation potential of Halomonas desertis G11, a new halophilic species which uses crude oil as a carbon and energy source and displays intrinsic resistance to salt stress conditions (optimum growth at 10% NaCl). G11 genome (3.96 Mb) had a mean GC content of 57.82%, 3622 coding sequences, 480 subsystems and 64 RNA genes. Annotation predicted 38 genes involved in osmotic stress including the biosynthesis of osmoprotectants glycine-betaine, ectoine and osmoregulated periplasmic glucans...
December 7, 2018: Genomics
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