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https://www.readbyqxmd.com/read/28641883/petroleum-oil-removal-by-immobilized-bacterial-cells-on-polyurethane-foam-under-different-temperature-conditions
#1
Mauricio J Alessandrello, María S Juárez Tomás, Enzo E Raimondo, Diana L Vullo, Marcela A Ferrero
In this work, a mixed biofilm composed by Pseudomonas monteilii P26 and Gordonia sp. H19 was formed using polyurethane foam (PUF) as immobilization support, for crude oil removal from artificial sea water. Fresh immobilized cells and immobilized cells that were stored at 4°C for two months before use were assessed. The oil removal assays were carried out at microcosm scale at 4, 15 and 30°C. A viability loss of P. monteilii P26 was observed after the storage. The highest removal value (75%) was obtained at 30°C after 7days using fresh immobilized cells on PUF...
June 19, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28637344/nicotine-delivery-to-the-aerosol-of-a-heat-not-burn-tobacco-product-comparison-with-a-tobacco-cigarette-and-e-cigarettes
#2
Konstantinos E Farsalinos, Nikoletta Yannovits, Theoni Sarri, Vassilis Voudris, Konstantinos Poulas
Introduction: The purpose was to measure nicotine levels to the tobacco and levels emitted to the aerosol of a heat-not-burn product (HnB, IQOS) compared to e-cigarettes (ECs) and a tobacco cigarette. Methods: The HnB device and regular and menthol sticks were purchased from Italy. Three types of ECs (ciga-like, eGo-style and variable wattage) and a commercially-available tobacco cigarette were also tested. A custom-made liquid containing 2% nicotine was used with ECs...
June 16, 2017: Nicotine & Tobacco Research: Official Journal of the Society for Research on Nicotine and Tobacco
https://www.readbyqxmd.com/read/28635264/cadmium-accumulation-risk-in-vegetables-and-rice-in-southern-china-insights-from-solid-solution-partitioning-and-plant-uptake-factor
#3
Yang Yang, Meie Wang, Weiping Chen, Yanling Li, Chi Peng
Solid-solution partitioning coefficient (Kd) and plant uptake factor (PUF) largely determine the solubility and mobility of soil Cd to food crops. A four-year regional investigation was conducted in contaminated vegetable and paddy fields of southern China to quantify the variability in Kd and PUF. The distributions of Kd and PUF characterizing transfers of Cd from soil to vegetable and rice are probabilistic in nature. Dynamics in soil pH and soil Zn greatly affected the variations of Kd. In addition to soil pH, soil organic matter had a major influence on PUF variations in vegetables...
June 21, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28629153/compositional-characteristics-and-in-vitro-evaluations-of-antioxidant-and-neuroprotective-properties-of-crude-extracts-of-fucoidan-prepared-from-compressional-puffing-pretreated-sargassum-crassifolium
#4
Wen-Ning Yang, Po-Wei Chen, Chun-Yung Huang
Fucoidan, a fucose-containing sulfated polysaccharide with diverse biological functions, is mainly recovered from brown algae. In this study, we utilized a compressional-puffing process (CPP) to pretreat Sargassum crassifolium (SC) and extracted fucoidans from SC by warm water. Three fucoidan extracts (SC1: puffing at 0 kg/cm²; SC2: puffing at 1.7 kg/cm²; and SC3: puffing at 6.3 kg/cm²) were obtained, and their composition, and antioxidant and neuroprotective activities were examined. The results suggest that CPP decreased the bulk density of algal samples, expanded the algal cellular structures, and eliminated the unpleasant algal odor...
June 18, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28602294/probing-the-specificity-of-polyurethane-foam-as-a-solid-phase-extractant-extractability-governing-molecular-attributes-of-lipophilic-phenolic-compounds
#5
Jie Han, Zhi Cao, Wei Qiu, Wei Gao, Jiangyong Hu, Baoshan Xing
The long-proposed use of open-cell polyurethane foam (PUF) as a convenient 'solid-phase extractant' for aqueous organic compounds has been hindered by a critical lack of understanding on the underlying specificity of its extraction mechanism. In this work, we tasked ourselves to understand the hierarchy of molecular structure, properties, and partitioning characteristics of compounds in PUF and aqueous phase by targeting lipophilic phenolic compounds (LPCs) as a group of primary targets for PUF extraction. Using six structurally related bisphenol analogs as comparative probes, we identified molecular lipophilicity and H-bond acidity as key molecular attributes that governed their extractability by PUF...
September 1, 2017: Talanta
https://www.readbyqxmd.com/read/28596535/identification-and-characterization-of-roles-for-puf1-and-puf2-proteins-in-the-yeast-response-to-high-calcium
#6
Ofir Haramati, Anastasia Brodov, Idan Yelin, Avigail Atir-Lande, Nitzan Samra, Yoav Arava
Members of the yeast family of PUF proteins bind unique subsets of mRNA targets that encode proteins with common functions. They therefore became a paradigm for post-transcriptional gene control. To provide new insights into the roles of the seemingly redundant Puf1 and Puf2 members, we monitored the growth rates of their deletions under many different stress conditions. A differential effect was observed at high CaCl2 concentrations, whereby puf1Δ growth was affected much more than puf2Δ, and inhibition was exacerbated in puf1Δpuf2Δ double knockout...
June 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28595930/a-novel-hybrid-product-that-heats-tobacco-through-controlled-aerosol-release-part-2-in%C3%A2-vitro-biological-assessment-and-comparison-with-different-tobacco-heating-products
#7
Damien Breheny, Jason Adamson, David Azzopardi, Andrew Baxter, Emma Bishop, Tony Carr, Ian Crooks, Katherine Hewitt, Tomasz Jaunky, Sophie Larard, Frazer Lowe, Oluwatobiloba Oke, Mark Taylor, Simone Santopietro, David Thorne, Benjamin Zainuddin, Marianna Gaça, Chuan Liu, James Murphy, Christopher Proctor
This study assessed the toxicological and biological responses of aerosols from a novel hybrid tobacco product. Toxicological responses from the hybrid tobacco product were compared to those from a commercially available Tobacco Heating Product (c-THP), a prototype THP (p-THP) and a 3R4F reference cigarette, using in vitro test methods which were outlined as part of a framework to substantiate the risk reduction potential of novel tobacco and nicotine products. Exposure matrices used included total particulate matter (TPM), whole aerosol (WA), and aqueous aerosol extracts (AqE) obtained after machine-puffing the test products under the Health Canada Intense smoking regime...
May 30, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28582674/spatial-distributions-and-enantiomeric-signatures-of-ddt-and-its-metabolites-in-tree-bark-from-agricultural-regions-across-china
#8
Lili Niu, Chao Xu, Chunlong Zhang, Yuting Zhou, Siyu Zhu, Weiping Liu
Tree bark is considered as an effective passive sampler for estimating the atmospheric status of pollutants. In this study, we conducted a national scale tree bark sampling campaign across China. Concentration profiles revealed that Eastern China, especially the Jing-Jin-Ji region (including Hebei Province, Beijing and Tianjin) was a hot spot of bark DDT pollution. The enantioselective accumulation of o,p'-DDT was observed in most of the samples and 68% of them showed a preferential depletion of (+)-o,p'-DDT...
June 2, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28576286/a-novel-hybrid-tobacco-product-that-delivers-a-tobacco-flavour-note-with-vapour-aerosol-part-1-product-operation-and-preliminary-aerosol-chemistry-assessment
#9
Simon Poynton, Joseph Sutton, Sharon Goodall, Jennifer Margham, Mark Forster, Ken Scott, Chuan Liu, Kevin McAdam, James Murphy, Christopher Proctor
Vapour products have demonstrated potential to be a lower-risk alternative to cigarettes. The present study describes a novel hybrid tobacco product that combines a warm aerosol stream generated by an electronic vaporisation mechanism with tobacco top flavour from cut tobacco. During operation, the aerosol stream released from the vapour cartomiser is passed through a bed of blended cut tobacco by the puffing flow, elevating the tobacco temperature and eluting volatile tobacco flavour components. A preliminary but comprehensive analysis of the aerosol composition of the hybrid tobacco product found that emissions were dominated by the control vapour formulation...
May 30, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28572636/nicotine-delivery-from-the-refill-liquid-to-the-aerosol-via-high-power-e-cigarette-device
#10
Nathalie Prévôt, Fabien de Oliveira, Sophie Perinel-Ragey, Thierry Basset, Jean-Michel Vergnon, Jérémie Pourchez
To offer an enhanced and well-controlled nicotine delivery from the refill liquid to the aerosol is a key point to adequately satisfy nicotine cravings using electronic nicotine delivery systems (ENDS). A recent high-power ENDS, exhibiting higher aerosol nicotine delivery than older technologies, was used. The particle size distribution was measured using a cascade impactor. The effects of the refill liquid composition on the nicotine content of each size-fraction in the submicron range were investigated. Nicotine was quantified by liquid chromatography coupled with tandem mass spectrometry...
June 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28570853/polyurethane-foam-membranes-filled-with-humic-acid-chitosan-crosslinked-gels-for-selective-and-simultaneous-removal-of-dyes
#11
Hu-Cheng Yang, Ji-Lai Gong, Guang-Ming Zeng, Peng Zhang, Jian Zhang, Hong-Yu Liu, Shuang-Yan Huan
Polyurethane foam membrane filled with humic acid-chitosan crosslinked gels (HA-CS-PUF) for dye removal was prepared by soaking the foams into humic acid-chitosan (HA-CS) crosslinked gels and hot-pressing them into membranes. Scanning electron microscope, derivative thermogravimetry and X-ray photoelectron spectroscopy were used to characterize the HA-CS-PUF membrane. Results showed that the interaction of HA and CS was mainly through ionic cross-linking between carboxyl and protonated amino groups. Three types of dyes, including positively charged methylene blue (MB), neutrally charged rhodamine B (RB) and negatively charged methyl orange (MO), were used to test membranes properties through static adsorption and membrane filtration experiments...
May 24, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28556278/acceptability-of-beehive-products-as-ingredients-in-quinoa-bars
#12
Francisco Rios, Manuel Lobo, Norma Samman
BACKGROUND: The aim of this work was to develop a puffed quinoa bar with beehive products of high content of phenolic compounds, based on acceptability and perception of consumers. A rotational central composite design of three variables (honey, pollen and propolis) was used for food product formulation. The responses to optimize were sensorial acceptability and polyphenol content. Next to acceptability a CATA test was performed with 115 consumers. Preference maps were used to relate acceptability and sensorial attributes of bars that cause rejection or acceptance...
May 29, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28554589/the-popop-puffing-on-pulse-oximeter-probe-sign-of-ethanol-withdrawal
#13
Sean M Bryant
No abstract text is available yet for this article.
May 22, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28548820/preparation-of-microcapsules-containing-benzoyl-peroxide-initiator-with-gelatin-gum-arabic-polyurea-formaldehyde-shell-and-evaluating-their-storage-stability
#14
M Raeesi, S M Mirabedini, R R Farnood
This work involves the optimized preparation and characterization of microcapsules which contain benzoyl peroxide (BPO) dispersed in dibutyl phthalate (DBP) with gelatin-gum arabic (Gel-GA)/polyurea-formaldehyde (PUF) shell. The microcapsules were prepared in two steps using complex coacervation and in situ polymerization techniques, respectively, at various mixing speeds and different core:shell ratios. The scanning electron microscopy (SEM), optical microscopy, and Fourier transform infrared (FTIR) spectroscopy were used for characterization of prepared microcapsules...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28547585/aio-casilio-a-robust-crispr-cas9-pumilio-system-for-chromosome-labeling
#15
Shuxian Zhang, Zhan Song
The biological function of chromatin bases on its spatial organization and dynamic activities in different situations. Labeling and tracing of genomic sequences has been a huge challenge in studying the spatial dynamics of chromatin. We reported the development of 'all-in-one Casilio system (Aio-Casilio)', a new system that enables the labeling of endogenous genomic loci. The Aio-Casilio system consists of the dCas9 protein, mClover fused with the Pumilio and FBF proteins RNA-binding domain (PUF domain) and an U6-sgRNA appended with multiple PUF-binding site(s)...
May 25, 2017: Journal of Molecular Histology
https://www.readbyqxmd.com/read/28545217/a-miniature-bird-borne-passive-air-sampler-for-monitoring-halogenated-flame-retardants
#16
Manon Sorais, Ali Rezaei, Joseph O Okeme, Miriam L Diamond, Ricardo Izquierdo, Jean-François Giroux, Jonathan Verreault
Birds have been used intensively as biomonitors of halogenated flame retardants (HFRs), and several studies have reported elevated tissue concentrations and inter-individual variability for these contaminants. While diet is known to be an important exposure pathway for HFRs in birds, it has been suggested that exposure through air may represent an underestimated source of HFRs for certain species. However, a method was not available for measuring the atmospheric exposure of individual birds to HFRs or other semi-volatile contaminants...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28525914/cigarette-filter-ventilation-and-its-relationship-to-increasing-rates-of-lung-adenocarcinoma
#17
Min-Ae Song, Neal L Benowitz, Micah Berman, Theodore M Brasky, K Michael Cummings, Dorothy K Hatsukami, Catalin Marian, Richard O'Connor, Vaughan W Rees, Casper Woroszylo, Peter G Shields
The 2014 Surgeon General's Report on smoking and health concluded that changing cigarette designs have caused an increase in lung adenocarcinomas, implicating cigarette filter ventilation that lowers smoking machine tar yields. The Food and Drug Administration (FDA) now has the authority to regulate cigarette design if doing so would improve public health. To support a potential regulatory action, two weight-of-evidence reviews were applied for causally relating filter ventilation to lung adenocarcinoma. Published scientific literature (3284 citations) and internal tobacco company documents contributed to causation analysis evidence blocks and the identification of research gaps...
December 1, 2017: Journal of the National Cancer Institute
https://www.readbyqxmd.com/read/28518098/engineering-artificial-factors-to-specifically-manipulate-alternative-splicing-in-human-cells
#18
Huan-Huan Wei, Yuanlong Liu, Yang Wang, Qianyun Lu, Xuerong Yang, Jiefu Li, Zefeng Wang
The processing of most eukaryotic RNAs is mediated by RNA Binding Proteins (RBPs) with modular configurations, including an RNA recognition module, which specifically binds the pre-mRNA target and an effector domain. Previously, we have taken advantage of the unique RNA binding mode of the PUF domain in human Pumilio 1 to generate a programmable RNA binding scaffold, which was used to engineer various artificial RBPs to manipulate RNA metabolism. Here, a detailed protocol is described to construct Engineered Splicing Factors (ESFs) that are specifically designed to modulate the alternative splicing of target genes...
April 26, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28514854/new-approach-for-the-synthesis-of-nanozirconia-fortified-microcapsules
#19
Chia-Chen Li, Dzu-How Yu, Shinn-Jen Chang, Jia-Wei Chen
Robust poly(urea-formaldehyde) (PUF) microcapsules with composite shells comprising zirconia (ZrO2) nanopowder incorporated in PUF were fabricated via a novel and facile one-pot synthesis. ZrO2 nanopowder was chosen because it owns one of the highest mechanical strengths among ceramics. The nanopowder was predispersed in the core material to combine encapsulation and fortification into a single process. In the core, the well-dispersed nanopowder migrated to the interface, where PUF polymerization took place...
May 26, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28449666/nicotine-aerosol-particles-carbonyls-and-volatile-organic-compounds-in-tobacco-and-menthol-flavored-e-cigarettes
#20
Mi-Sun Lee, Ryan F LeBouf, Youn-Suk Son, Petros Koutrakis, David C Christiani
BACKGROUND: We aimed to assess the content of electronic cigarette (EC) emissions for five groups of potentially toxic compounds that are known to be present in tobacco smoke: nicotine, particles, carbonyls, volatile organic compounds (VOCs), and trace elements by flavor and puffing time. METHODS: We used ECs containing a common nicotine strength (1.8%) and the most popular flavors, tobacco and menthol. An automatic multiple smoking machine was used to generate EC aerosols under controlled conditions...
April 27, 2017: Environmental Health: a Global Access Science Source
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