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https://www.readbyqxmd.com/read/28231369/estimation-of-partitioning-of-airflow-in-septal-surgery-a-prospective-study-with-reference-to-the-nose-scale
#1
Indranil Sen, Mainak Dutta, Dibakar Haldar, Ramanuj Sinha
Improper patient selection for septal surgery often has been found to result in therapeutic failure, and there needs to be an objective assessment of nasal obstruction before the surgery and for postoperative follow-up that can be applied in the routine otolaryngology practice. The purpose of this study is to assess the usefulness of a cost-effective device for objective measurement of the nasal airway partitioning in selecting patients for septal surgery and for postoperative outcome evaluation. A hospital-based, prospective, observational study was carried out in a tertiary-care teaching institution involving 74 patients waiting for septal surgery...
February 2017: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/28228111/antimicrobial-structure-activity-relationship-of-five-anthraquinones-of-emodine-type-isolated-from-vismia-laurentii
#2
Gislaine Aurelie Kemegne, Pierre Mkounga, Jean Justin Essia Ngang, Sylvain Leroy Sado Kamdem, Augustin Ephrem Nkengfack
BACKGROUND: Antimicrobial activity of anthraquinone compounds of emodine type has been reported by many authors. These compounds are found in Vismia laurentii (Clusiaceae), a plant used in traditional pharmacopoeia for treatment of microbial infections among others affections. The continuous identification of new compounds has raised the problem of the relation between the structure and antimicrobial properties. RESULTS: The yeast growth kinetics parameters were not influenced by the pH variation as it was the case for the other tested bacteria...
February 22, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28225285/multi-scale-modeling-of-the-effects-of-salt-and-perfume-raw-materials-on-the-rheological-properties-of-commercial-thread-like-micellar-solutions
#3
Xueming Tang, Weizhong Zou, Peter H Koenig, Shawn D McConaughy, Michael R Weaver, David Michael Eike, Michael J Schmidt, Ronald G Larson
We link micellar structures to rheological properties for two surfactant body-wash formulations at various concentrations of salts and perfume raw materials (PRMs) using molecular simulations and micellar-scale modeling as well as traditional surfactant packing arguments. The two body washes, named BW-1EO and BW-3EO, are composed of sodium lauryl ethylene glycol ether sulfate (SLEnS, where n is the average number of ethylene glycol repeat units), cocamidopropyl betaine (CAPB), ACCORD (which is a mixture of six PRMs), and NaCl salt...
February 22, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28218848/effect-of-c%C3%AE-c%C3%AE-bond-type-on-the-radical-scavenging-activity-of-hydroxy-stilbenes-theoretical-insights-in-the-gas-and-liquid-phase
#4
Nikolaos Nenadis, Katholiki Stavra
Density functional theory/Becke's 3-parameter hybrid functional combined with the Lee-Yang-Parr correlation functional (DFT/B3LYP) was used to examine the radical scavenging potential of resveratrol, piceatannol, and their dehydro/dihydro counterparts. For this reason, the values of molecular descriptors predicting the hydrogen atom transfer (HAT) and the single electron transfer preceding (SET-PT) or following a proton transfer (SPLET) were computed in the gas and liquid (benzene, water) phase. The double bond, resulting in molecular planarity, was predicted to favor the single hydrogen or electron transfer...
February 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28218330/predicting-the-phospholipophilicity-of-monoprotic-positively-charged-amines
#5
S T J Droge, J L M Hermens, S Gutsell, J Rabone, G Hodges
The sorption affinity of eighty-six charged amine structures to phospholipid monolayers (log KIAM) was determined using immobilized artificial membrane high-performance liquid chromatography (IAM-HPLC). The amine compounds covered the most prevalent types of polar groups, widely ranged in structural complexity, and included forty-seven pharmaceuticals, as well as several narcotics and pesticides. Amine type specific corrective increments were used to align log KIAM data with bilayer membrane sorption coefficients (KMW(IAM))...
February 20, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28212986/correlating-the-effects-of-antimicrobial-preservatives-on-conformational-stability-aggregation-propensity-and-backbone-flexibility-of-an-igg1-monoclonal-antibody
#6
Jayant Arora, Sangeeta B Joshi, C Russell Middaugh, David D Weis, David B Volkin
Multi-dose formulations of biotherapeutics, which offer better dosage management and reduced production costs, require the addition of antimicrobial preservatives (APs). APs have been shown, however, to decrease protein stability in solution and cause protein aggregation. In this report, the effect of four APs, m-cresol, phenol, phenoxyethanol and benzyl alcohol, on conformational stability, aggregation propensity and backbone flexibility of an IgG1 monoclonal antibody, mAb-4, is investigated. Compared to no preservative control, each of the APs decreased the conformational stability of mAb-4 as measured by DSC and extrinsic fluorescence spectroscopy...
February 14, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28211691/lipophilized-grape-seed-proanthocyanidin-derivatives-as-novel-antioxidants
#7
Mingshun Chen, Shujuan Yu
Grape seed proanthocyanidin (GSP) is a natural food antioxidant. Natural proanthocyanidins (PC) in grape seed are usually polyhydroxy derivatives which exhibit hydrophilic character. GSP was modified structurally to improve its lipophilicity, expand its application in lipophilic media, and enhance its cellular absorption in vivo. Esterification of the water-soluble GSP was prepared by immobilized lipase Lipozyme TL IM with lauric acid, and their enhanced lipophilicity was confirmed by the 1-octanol/water partition coefficient...
February 17, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28211267/efficient-and-selective-uptake-of-tco4-by-a-cationic-metal-organic-framework-material-with-open-ag-sites
#8
Daopeng Sheng, Lin Zhu, Chao Xu, Chengliang Xiao, Yanlong Wang, Yaxing Wang, Lanhua Chen, Juan Diwu, Jing Chen, Zhifang Chai, Thomas E Albrecht-Schmitt, Shuao Wang
99Tc is one of the most problematic radioisotopes in used nuclear fuel owing to its combined features of high fission yield, long half-life, and high environmental mobility. There are only a handful of functional materials that can remove TcO4- anion from aqueous solution and identifying for new, stable materials with high anion-exchange capacities, fast kinetics, and good selectivity remains a challenge. We report here an 8-fold interpenetrated three-dimensional cationic metal-organic framework material, SCU-100, which is assembled from a tetradentate neutral nitrogen-donor ligand and two-coordinate Ag+ cations as potential open metal sites...
February 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28211085/variable-selection-in-the-functional-linear-concurrent-model
#9
Jeff Goldsmith, Joseph E Schwartz
We propose methods for variable selection in the context of modeling the association between a functional response and concurrently observed functional predictors. This data structure, and the need for such methods, is exemplified by our motivating example: a study in which blood pressure values are observed throughout the day, together with measurements of physical activity, location, posture, affect or mood, and other quantities that may influence blood pressure. We estimate the coefficients of the concurrent functional linear model using variational Bayes and jointly model residual correlation using functional principal components analysis...
February 17, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28205404/macrocyclic-triamine-derived-glucose-analogues-for-99m-tc-co-3-labeling-synthesis-and-biological-evaluation-as-potential-tumor-imaging-agents
#10
Teli Liu, Qianqian Gan, Junbo Zhang
[(99m) Tc(CO)3 (H2 O)3 ](+) has attracted great attention among (99m) Tc-labeling techniques, due to its ease of preparation, readily substituted water molecules of the precursor fac-[(99m) Tc(CO)3 (H2 O)3 ](+) by a variety of functional groups, small size and inertness. Bifunctional chelator based on a macrocyclic polyamine framework shows easy complexation with [(99m) Tc(CO)3 (H2 O)3 ](+) to produce stable complex. In this study, two novel 1, 5, 9-triazacyclododecane derivatives containing a glucose group (6 and 7) were successfully synthesized by reacting different glucose-azides with alkyne-[12]aneN3 via the so-called click chemistry and radiolabeled with [(99m) Tc(CO)3 (H2 O)3 ](+) to form (99m) Tc(CO)3 -6 (C-1-substituted complex) and (99m) Tc(CO)3 -7 (C-2-substituted complex) in high yields...
February 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28205280/within-and-between-session-reproducibility-of-gaba-measurements-with-mr-spectroscopy
#11
Maiken K Brix, Lars Ersland, Kenneth Hugdahl, Gerard E Dwyer, Renate Grüner, Ralph Noeske, Mona K Beyer, Alexander R Craven
PURPOSE: The reproducibility of the MEGA-PRESS (MEshcher-GArwood Point RESolved Spectroscopy) MR spectroscopy sequence for the measurement of gamma- aminobutyric acid (GABA) is addressed, focusing on optimizing the number of repetitions at two voxel locations in the human brain and associated possibilities in analysis tools. MATERIALS AND METHODS: Two 20-min MEGA-PRESS acquisitions were run (echo time = 68 ms, repetition time = 1800 ms, repetitions = 328): one from a 21 mL volume in the anterior cingulate cortex (ACC) and one from a 22 mL volume in the left Broca's area in 21 healthy male volunteers (age 32 years ± 6[SD])...
February 15, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28199946/bioavailability-and-bioaccessibility-of-polycyclic-aromatic-hydrocarbons-from-post-pyrolytically-treated-biochars
#12
Isabel Hilber, Philipp Mayer, Varvara Gouliarmou, Sarah E Hale, Gerard Cornelissen, Hans-Peter Schmidt, Thomas D Bucheli
Bioaccessibility data of PAHs from biochar produced under real world conditions is scarce and the influence of feedstock and various post-pyrolysis treatments common in agriculture, such as co-composting or lacto-fermentation to produce silage fodder, on their bioavailability and bioaccessibility has hardly been studied. The total (Ctotal), and freely dissolved (i.e., bioavailable) concentrations (Cfree) of the sum of 16 US EPA PAHs of 43 biochar samples produced and treated in such ways ranged from 0.4 to almost 2000 mg/kg, and from 12 to 81 ng/L, respectively, which resulted in very high biochar-water partition coefficients (4...
February 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28199940/measurement-of-polyurethane-foam-air-partition-coefficients-for-semivolatile-organic-compounds-as-a-function-of-temperature-application-to-passive-air-sampler-monitoring
#13
Ana Paula Francisco, Tom Harner, Anita Eng
Polyurethane foam - air partition coefficients (KPUF-air) for 9 polycyclic aromatic hydrocarbons (PAHs), 10 alkyl-substituted PAHs, 4 organochlorine pesticides (OCPs) and dibenzothiophene were measured as a function of temperature over the range 5 °C-35 °C, using a generator column approach. Enthalpies of PUF-to-air transfer (ΔHPUF-air, kJ/mol) were determined from the slopes of log KPUF-air versus 1000/T (K), and have an average value of 81.2 ± 7.03 kJ/mol. The log KPUF-air values at 22 °C ranged from 4...
January 31, 2017: Chemosphere
https://www.readbyqxmd.com/read/28198634/phase-composition-control-in-microsphere-supported-biomembrane-systems
#14
Eric S Fried, Yue-Ming Li, Malcolm Lane Gilchrist
The popularization of studies in membrane protein lipid phase coexistence has prompted the development of new techniques to construct and study biomimetic systems with cholesterol-rich lipid microdomains. Here, microsphere supported biomembranes with integrated α-helical peptides, referred to as proteolipobeads (PLBs), were used to model peptide/protein partitioning within DOPC/DPPC/cholesterol phase-separated membranes. Due to the appearance of compositional heterogeneity and impurities in the formation of model PLB assemblies, fluorescence-activated cell sorting (FACS) was used to characterize and sort PLB populations on the basis of disordered phase (Ld) content...
February 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28198376/selective-sulfur-dioxide-adsorption-on-crystal-defect-sites-on-an-isoreticular-metal-organic-framework-series
#15
L Marleny Rodríguez-Albelo, Elena López-Maya, Said Hamad, A Rabdel Ruiz-Salvador, Sofia Calero, Jorge A R Navarro
The widespread emissions of toxic gases from fossil fuel combustion represent major welfare risks. Here we report the improvement of the selective sulfur dioxide capture from flue gas emissions of isoreticular nickel pyrazolate metal organic frameworks through the sequential introduction of missing-linker defects and extra-framework barium cations. The results and feasibility of the defect pore engineering carried out are quantified through a combination of dynamic adsorption experiments, X-ray diffraction, electron microscopy and density functional theory calculations...
February 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28196915/proper-accounting-for-surface-area-to-solution-volume-ratios-in-exaggerated-extractions
#16
Dennis Jenke, Barrett Rabinow
When drug products contact plastic manufacturing components, packaging systems and/or delivery devices, leachables from the plastics can accumulate in the drug product, potentially affecting its key quality attributes. Given practical issues associated with screening drug products for leachables, potential leachables are frequently surfaced as extractables revealed in extraction studies. To facilitate extractables discovery and identification and to shorten extraction times, extraction studies can be exaggerated and/or accelerated...
February 14, 2017: PDA Journal of Pharmaceutical Science and Technology
https://www.readbyqxmd.com/read/28195714/predicting-partitioning-and-diffusion-properties-of-nonpolar-chemicals-in-biotic-media-and-passive-sampler-phases-by-gc-%C3%A3-gc
#17
Deedar Nabi, J Samuel Arey
The chemical parameters needed to explain and predict bioavailability, biodynamics, and baseline toxicity are not readily available for most nonpolar chemicals detected in the environment. Here, we demonstrate that comprehensive two-dimensional gas chromatography (GC × GC) retention times can be used to predict 26 relevant properties for nonpolar chemicals, specifically: partition coefficients for diverse biotic media and passive sampler phases; aquatic baseline toxicity; and relevant diffusion coefficients...
February 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28185155/perfluoroalkyl-acids-pfaas-in-water-and-sediment-from-the-coastal-regions-of-shandong-peninsula-china
#18
Yi Wan, Shiliang Wang, Xuezhi Cao, Yuanxin Cao, Lu Zhang, Hui Wang, Jinfeng Liu
Perfluoroalkyl acids (PFAAs) have been observed in various environmental matrices globally in recent years. In this study, the levels, spatial distribution tendencies, and partitioning characteristics of the target 12 PFAAs were investigated in water and sediment from the coastal regions of Shandong peninsula in China, and two sediment core samples were also collected to study the vertical and historical variation of PFAAs. The ranges (means) of total PFAA concentrations were 23.69-148.48 ng/L (76.11 ng/L) in the water and 1...
March 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28183039/estimation-of-amount-of-selected-pharmaceuticals-sorbed-onto-digested-sludge-from-wastewater-treatment-plant-bratislava-petr%C3%A5-alka
#19
Lucia Ivanová, Milota Fáberová, Tomáš Mackuľak, Roman Grabic, Igor Bodík
Antibiotics and antidepressants are among the most successful drugs used for human therapy. Their concentration in influent on WWTP is relative high and there can be removed by biodegradation or sorption. The aim of this study was to define the amounts of sorbed pharmaceuticals on digested sludge from WWTP Bratislava - Petržalka. The amounts of sorbed pharmaceuticals were calculated from knowing partition coefficients for selected pharmaceuticals and from analytically measured pharmaceutical´s concentrations in sludge liquor...
February 6, 2017: Environmental Research
https://www.readbyqxmd.com/read/28182434/a-model-based-approach-to-assessing-the-importance-of-intracellular-binding-sites-in-doxorubicin-disposition
#20
Ilse R Dubbelboer, Elsa Lilienberg, Erik Sjögren, Hans Lennernäs
Doxorubicin is an anticancer agent, which binds reversibly to topoisomerase I and II, intercalates to DNA base pairs, and generates free radicals. Doxorubicin has a high tissue:plasma partition coefficient and high intracellular binding to the nucleus and other subcellular compartments. The metabolite doxorubicinol has an extensive tissue distribution. This porcine study investigated whether the traditional implementation of tissue binding, described by the tissue:plasma partition coefficient (Kp,t), could be used to appropriately analyze and/or simulate tissue doxorubicin and doxorubicinol concentrations in healthy pigs, when applying a physiologically based pharmacokinetic (PBPK) model approach, or whether intracellular binding is required in the semi-PBPK model...
February 23, 2017: Molecular Pharmaceutics
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