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https://www.readbyqxmd.com/read/28732333/p-nitrophenol-degradation-by-electro-fenton-process-pathway-kinetic-model-and-optimization-using-central-composite-design
#1
J Meijide, E Rosales, M Pazos, M A Sanromán
The chemical process scale-up, from lab studies to industrial production, is challenging and requires deep knowledge of the kinetic model and the reactions that take place in the system. This knowledge is also useful in order to be employed for the reactor design and the determination of the optimal operational conditions. In this study, a model substituted phenol such as p-nitrophenol was degraded by electro-Fenton process and the reaction products yielded along the treatment were recorded. The kinetic model was developed using Matlab software and was based on main reactions that occurred until total mineralization which allowed predicting the degradation pathway under this advanced oxidation process...
July 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28732321/aggregating-exposures-cumulating-risk-for-semivolatile-organic-compounds-a-review
#2
REVIEW
Maud Pelletier, Nathalie Bonvallot, Philippe Glorennec
Increasingly, health risk assessment is addressing multiple pathway exposures to multiple contaminants. We reviewed aggregated exposure and cumulative risk approaches for contemporary and ubiquitous semivolatile organic compounds (SVOC). We identified 22 studies aggregating exposure pathways, and 31 cumulating risk. Exposure aggregation is based on the addition of pathway-specific doses, using kinetic modeling where it exists, and classic external dose equations otherwise. In most cases, exposure is dominated by a single route or source of exposure - mainly the oral pathway - via dietary or non-dietary exposure...
July 18, 2017: Environmental Research
https://www.readbyqxmd.com/read/28732306/photostability-testing-using-online-reactor-hplc-hyphenation-and-mass-spectrometric-compound-identification-illustrated-by-ketoprofen-as-model-compound
#3
Jaber Assaf, Diego Zulkiewicz Gomes, Bernhard Wuest, Maria Kristina Parr
Investigations on the photochemical stability of pharmaceutical substances are mandatory in drug development and licensing as photo-induced degradation of an active pharmaceutical ingredient (API) may not only lead to decreased API concentrations but also to toxic or reactive products. Thus, the US Food and Drug Administration (FDA) and the International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use (ICH) issued Guidance for Industry Q1B "Photostability Testing of New Drug Substances and Products" for testing of pure but also packed drugs...
July 8, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28732290/synergistic-effect-of-uv-pretreated-fe-zsm-5-catalysts-for-heterogeneous-catalytic-complete-oxidation-of-voc-a-technology-development-for-sustainable-use
#4
Abdul Aziz, Kwang Soo Kim
In this work, the performance of benzene, toluene, ethylbenzene, and xylene (BTEX) removal and degradation from gas, air streams on UV pretreated Fe-ZSM-5 in a batch reactor at room temperature were studied. The Fe-ZSM-5 zeolite catalyst was prepared by hydrothermal reaction method. The influence of UV pre-irradiation time on the removal of BTEX were assessed by varying the time, ranging from 15min to 60smin. Then, sustainability of the activation of the catalyst resulted by UV pretreatment was studied by the four-cycle experiment with one time UV irradiation and after each cycle irradiation followed by BTEX removal after every cycle respectively...
July 10, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28732239/effects-of-antiepileptic-drugs-on-mitochondrial-functions-morphology-kinetics-biogenesis-and-survival
#5
REVIEW
Josef Finsterer, Fulvio A Scorza
OBJECTIVES: Antiepileptic drugs (AEDs) exhibit adverse and beneficial effects on mitochondria, which have a strong impact on the treatment of patients with a mitochondrial disorder (MID) with epilepsy (mitochondrial epilepsy). This review aims at summarizing and discussing recent findings concerning the effect of AEDs on mitochondrial functions and the clinical consequences with regard to therapy of mitochondrial epilepsy and of MIDs in general. METHODS: Literature review...
July 13, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28732200/systematic-metrics-depicting-cell-death-kinetics
#6
Ying Li, Junying Yuan
In a recent issue of Cell Systems, Forcina et al. (2017) developed a scalable time-lapse analysis of cell death kinetics (STACK) method and combined it with a "lag exponential death" model to quantitatively characterize the onset and rate of cell death. STACK provides a useful quantitative tool to determine how cell death kinetics may be modulated pharmacologically in cell culture systems.
July 20, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28732169/design-of-modular-peptide-surfactants-and-their-surface-activity
#7
Hao-Fei Wang, David Wibowo, Zhengzhong Shao, Anton Peter J Middelberg, Chun-Xia Zhao
Designed peptide surfactants offer a number of advanced properties over conventional petrochemical surfactants, including biocompatibility, sustainability, and tailorability of the chemical and physical properties through peptide design. Their biocompatibility and degradability make them attractive for various applications, particularly for food and pharmaceutical applications. In this work, two new peptide surfactants derived from an amphiphilic peptide surfactant (AM1) were designed (AM-S and C8-AM) to better understand links between structure, interfacial activity and emulsification...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28732164/electrochemical-intercalation-of-mg-2-into-anhydrous-and-hydrated-crystalline-tungsten-oxides
#8
Ruocun Wang, Ching-Chang Chung, Yang Liu, Jacob L Jones, Veronica Augustyn
The reversible intercalation of multivalent cations, especially Mg(2+), into a solid-state electrode is an attractive mechanism for next-generation energy storage devices. These reactions typically exhibit poor kinetics due to a high activation energy for interfacial charge-transfer and slow solid-state diffusion. Interlayer water in V2O5 and MnO2 has been shown to improve Mg(2+) intercalation kinetics in non-aqueous electrolytes. Here, the effect of structural water on Mg(2+) intercalation in non-aqueous electrolytes is examined in crystalline WO3 and the related hydrated and layered WO3·nH2O (n = 1, 2)...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28732154/ironing-out-genes-in-the-environment-an-experimental-study-of-the-dna-goethite-interface
#9
Michael P Schmidt, Carmen Enid Martinez
DNA fate in soil plays an important role in the cycling of genetic information in the environment. Adsorption onto mineral surfaces has great impact on this function. This study probes the kinetics, equilibrium behavior and bonding mechanisms associated with adsorption of DNA onto goethite, a common soil mineral. Surface sensitive ATR-FTIR and XPS approaches are applied to directly characterize the DNA-goethite interface. Adsorption kinetics follow a pseudo-first order model, suggesting adsorption rate is surface limited...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28732076/eincr1-is-an-egf-inducible-lincrna-overexpressed-in-lung-adenocarcinomas
#10
Karol Nowicki-Osuch, Yaoyong Li, Mairi Challinor, David T Gerrard, Neil A Hanley, Andrew D Sharrocks
Long non-coding RNAs are being increasingly recognised as important molecules involved in regulating a diverse array of biological functions. For example, many long non-coding RNAs have been associated with tumourigenesis and in this context their molecular functions often involves impacting on chromatin and transcriptional control processes. One important cellular control system that is often deregulated in cancer cells is the ERK MAP kinase pathway. Here we have investigated whether ERK pathway signaling in response to EGF stimulation, leads to changes in the production of long non-coding RNAs...
2017: PloS One
https://www.readbyqxmd.com/read/28732041/understanding-russell-s-viper-venom-factor-v-activator-s-substrate-specificity-by-surface-plasmon-resonance-and-in-silico-studies
#11
Pradeep K Yadav, Christian B Antonyraj, Syed Ibrahim Basheer Ahamed, Sistla Srinivas
Blood coagulation factor V (FV) is activated either by Factor X or thrombin, cleaving at three different sites viz., Site I (Arg709-Ser710), site II (Arg1018-Thr1019), and site III (Arg1545-Ser1546). Russell's viper venom factor V activator (RVV-V) is a thrombin-like serine proteinase that activates FV with selective, single cleavage at site III. A long lasting effort is being pending in understanding the 'selective' binding specificity of the RVV-V towards site III. Here, we present the binding kinetic study of RVV-V with two designed peptides corresponding to the regions from site I (Gln699-Asn713) and site II (1008Lys-Pro1022), respectively, that include 15 amino acids...
2017: PloS One
https://www.readbyqxmd.com/read/28732021/in-vitro-comparison-of-213bi-and-177lu-radiation-for-peptide-receptor-radionuclide-therapy
#12
Ho Sze Chan, Erik de Blois, Alfred Morgenstern, Frank Bruchertseifer, Marion de Jong, Wouter Breeman, Mark Konijnenberg
BACKGROUND: Absorbed doses for α-emitters are different from those for β-emitters, as the high linear energy transfer (LET) nature of α-particles results in a very dense energy deposition over a relatively short path length near the point of emission. This highly localized and therefore high energy deposition can lead to enhanced cell-killing effects at absorbed doses that are non-lethal in low-LET type of exposure. Affinities of DOTA-DPhe1-Tyr3-octreotate (DOTATATE), 115In-DOTATATE, 175Lu-DOTATATE and 209Bi-DOTATATE were determined in the K562-SST2 cell line...
2017: PloS One
https://www.readbyqxmd.com/read/28732019/rate-of-hepatitis-c-viral-clearance-by-human-livers-in-human-patients-liver-transplantation-modeling-primary-infection-and-implications-for-studying-entry-inhibition
#13
Michael G Hughes, William W Tucker, Sreelatha Reddy, Michael E Brier, David Koch, Craig J McClain, Colleen B Jonsson, Nobuyuki Matoba, Donghoon Chung
To better understand the dynamics of early hepatitis C virus (HCV) infection, we determined how rapidly non-cirrhotic HCV-uninfected liver allografts clear HCV from the circulation of cirrhotic HCV-infected patients at the time of transplantation but before administration of immunosuppression. Specifically, we characterized serum HCV kinetics during the first 90 min of reperfusion for 19 chronically HCV-infected patients transplanted with an HCV-uninfected liver by measuring serum viral load immediately prior to reperfusion (t = 0) and then every 15 min for a total of 90 min (t = 90)...
2017: PloS One
https://www.readbyqxmd.com/read/28731762/measurement-of-neutral-current-k-production-by-neutrinos-using-minerva
#14
C M Marshall, L Aliaga, O Altinok, L Bellantoni, A Bercellie, M Betancourt, A Bodek, A Bravar, T Cai, M F Carneiro, H da Motta, S A Dytman, G A Díaz, M Dunkman, B Eberly, E Endress, J Felix, L Fields, R Fine, A M Gago, R Galindo, H Gallagher, A Ghosh, T Golan, R Gran, D A Harris, A Higuera, K Hurtado, J Kleykamp, M Kordosky, T Le, E Maher, S Manly, W A Mann, D A Martinez Caicedo, K S McFarland, C L McGivern, A M McGowan, B Messerly, J Miller, A Mislivec, J G Morfín, J Mousseau, D Naples, J K Nelson, A Norrick, Nuruzzaman, V Paolone, C E Patrick, G N Perdue, M A Ramírez, R D Ransome, H Ray, L Ren, D Rimal, P A Rodrigues, D Ruterbories, D W Schmitz, C J Solano Salinas, M Sultana, S Sánchez Falero, E Valencia, T Walton, J Wolcott, M Wospakrik, B Yaeggy, D Zhang
Neutral-current production of K^{+} by atmospheric neutrinos is a background in searches for the proton decay p→K^{+}ν[over ¯]. Reactions such as νp→νK^{+}Λ are indistinguishable from proton decays when the decay products of the Λ are below detection threshold. Events with K^{+} are identified in MINERvA by reconstructing the timing signature of a K^{+} decay at rest. A sample of 201 neutrino-induced neutral-current K^{+} events is used to measure differential cross sections with respect to the K^{+} kinetic energy, and the non-K^{+} hadronic visible energy...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731691/singlet-oxygen-photophysics-in-liquid-solvents-converging-on-a-unified-picture
#15
Mikkel Bregnhøj, Michael Westberg, Boris F Minaev, Peter R Ogilby
Singlet oxygen, O2(a(1)Δg), the lowest excited electronic state of molecular oxygen, is an omnipresent part of life on earth. It is readily formed through a variety of chemical and photochemical processes, and its unique reactions are important not just as a tool in chemical syntheses but also in processes that range from polymer degradation to signaling in biological cells. For these reasons, O2(a(1)Δg) has been the subject of intense activity in a broad distribution of scientific fields for the past ∼50 years...
July 21, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28731675/sustained-release-of-a-peptide-based-matrix-metalloproteinase-2-inhibitor-to-attenuate-adverse-cardiac-remodeling-and-improve-cardiac-function-following-myocardial-infarction
#16
Zhaobo Fan, Minghuan Fu, Zhaobin Xu, Bo Zhang, Zhihong Li, Haichang Li, Xinyu Zhou, Xuanyou Liu, Yunyan Duan, Pei-Hui Lin, Pu Duann, Xiaoyun Xie, Jianjie Ma, Zhenguo Liu, Jianjun Guan
Following myocardial infarction (MI), degradation of extracellular matrix (ECM) by upregulated matrix metalloproteinases (MMPs) especially MMP-2 decreases tissue mechanical properties, leading to cardiac function deterioration. Attenuation of cardiac ECM degradation at the early stage of MI has the potential to preserve tissue mechanical properties, resulting in cardiac function increase. Yet the strategy for efficiently preventing cardiac ECM degradation remains to be established. Current preclinical approaches have shown limited efficacy due to low drug dosage allocated to the heart tissue, dose-limiting side effects, and cardiac fibrosis...
July 21, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28731585/bacterial-invertases-occurrence-production-biochemical-characterization-and-significance-of-transfructosylation
#17
REVIEW
Lynette Lincoln, Sunil S More
Invertase or β-D-fructofuranoside fructohydrolase (EC 3.2.1.26) was one of the foremost enzyme biocatalysts and established the primary concepts of most enzyme-kinetic principles. Invertases are glycoside hydrolases and occur mostly in microorganisms. Among microbial strains, for many decades yeast species have been extensively researched for invertase production, characterization, and applications in industries. Besides, limited literature is available on invertases from bacterial strains. The enzymic and molecular biological reports from bacterial invertases are scarce...
July 21, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28731571/model-based-investigation-on-the-mass-transfer-and-adsorption-mechanisms-of-mono-pegylated-lysozyme-in-ion-exchange-chromatography
#18
Josefine Morgenstern, Gang Wang, Pascal Baumann, Jürgen Hubbuch
Recent studies highlighted the potential of PEGylated proteins to improve stabilities and pharmacokinetics of protein drugs. Ion-exchange chromatography (IEX) is among the most frequently used purification methods for PEGylated proteins. However, the underlying physical mechanisms allowing for a separation of different PEGamers (proteins with a varying number of attached PEG molecules) are not yet fully understood. In this work, mechanistic chromatography modeling was applied to gain a deeper understanding of the mass transfer and adsorption/desorption mechanisms of mono-PEGylated proteins in IEX...
July 21, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28731428/development-of-nasal-lipid-nanocarriers-containing-curcumin-for-brain-targeting
#19
Gustavo Richter Vaz, Gabriela Hädrich, Juliana Bidone, Jamile Lima Rodrigues, Mariana Corrêa Falkembach, Jean-Luc Putaux, Mariana Appel Hort, José Maria Monserrat, Antônio Sergio Varela Junior, Helder Ferreira Teixeira, Ana Luiza Muccillo-Baisch, Ana Paula Horn, Cristiana Lima Dora
BACKGROUND: Curcumin (CUR) has properties that can be useful for the treatment of Alzheimer's disease. Such properties are the inhibition of amyloid-β-protein (Aβ) aggregation, Aβ-induced inflammation, and activities of β-secretase and acetylcholinesterase. However, previous studies have revealed that CUR exhibited low bioavailability and difficulties in reaching the brain. OBJECTIVE: To overcome such drawbacks, this study aims at developing nasal lipid nanocarriers loaded with CUR to effectively target the brain...
July 17, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28731351/theory-of-light-modulated-emission-spectroscopy
#20
Mehdi Ansari-Rad, Juan Bisquert
Perovskite solar cells and fluorescent collectors formed by a dispersion of quantum dots in a transparent solid are paradigmatic devices for photon capture and utilization that involve the coupling of photon displacement, absorption and regeneration. In order to obtain information about the coupled photonic processes in systems involving photon recycling, we analyse the transfer function for modulated outgoing to incoming photon flux. We show the physical features of light-to-light impedance that reveals a trap-limited diffusion of photons coupled with the nonradiative recombination...
July 21, 2017: Journal of Physical Chemistry Letters
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