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https://www.readbyqxmd.com/read/29241292/the-in-situ-enzymatic-screening-ises-approach-to-reaction-discovery-and-catalyst-identification
#1
Robert A Swyka, David B Berkowitz
The importance of discovering new chemical transformations and/or optimizing catalytic combinations has led to a flurry of activity in reaction screening. The in situ enzymatic screening (ISES) approach described here utilizes biological tools (enzymes/cofactors) to advance chemistry. The protocol interfaces an organic reaction layer with an adjacent aqueous layer containing reporting enzymes that act upon the organic reaction product, giving rise to a spectroscopic signal. ISES allows the experimentalist to rapidly glean information on the relative rates of a set of parallel organic/organometallic reactions under investigation, without the need to quench the reactions or draw aliquots...
December 14, 2017: Current Protocols in Chemical Biology
https://www.readbyqxmd.com/read/29241283/-there-is-no-season-for-gifts
#2
Klaus Lieb, Cora Koch
Gifts and payments from pharmaceutical manufacturers to medical doctors constitute a conflict of interest, which may lead to an undue influence on prescribing behavior. In Germany, 35 research-based pharmaceutical companies, organized in the "Verband der forschenden Arzneimittelhersteller (VfA)" paid € 562 million to medical doctors and hospitals in 2016. Of these, € 356 million were paid for clinical trials and non-interventional studies, € 105 million for sponsored presentations and CME and € 101 million went to hospitals and other organizations for sponsoring, consulting and events...
December 2017: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/29241213/antibiotics-induced-obesity-a-mitochondrial-perspective
#3
Melisa J Andrade, Chinchu Jayaprakash, Smitha Bhat, Nikolaos Evangelatos, Angela Brand, Kapaettu Satyamoorthy
Antibiotics are the first line of treatment against infections and have contributed immensely to reduce the morbidity and mortality rates. Recently, extensive use of antibiotics has led to alterations of the gut microbiome, predisposition to various diseases and most importantly, increase in the emergence of antibiotic-resistant bacteria, which poses a major threat to global public health. Another major issue faced worldwide due to unregulated use of antibiotics in children as well as in adults is the influence of metabolism and body weight homeostasis, leading to obesity...
December 15, 2017: Public Health Genomics
https://www.readbyqxmd.com/read/29241184/peritonitis-in-children-on-chronic-peritoneal-dialysis-the-experience-of-a-large-national-pediatric-cohort
#4
Daniela Ponce, Thyago Proença de Moraes, Roberto Pecoits-Filho, Ana Elizabeth Figueiredo, Pasqual Barretti
BACKGROUND: We performed this study to evaluate the incidence, risk factors, microbiology, treatment, and outcome of peritonitis in pediatric Peritoneal dialysis (PD) patients at a nationwide prospective study. METHODOLOGY: Patients younger than 18 years recruited in the BRAZPD II study from 2004 to 2011, who presented their first peritonitis episode, were included in the study. RESULTS: We found 125 first episodes of peritonitis in 491 children PD patients (0...
December 14, 2017: Blood Purification
https://www.readbyqxmd.com/read/29241158/cation-induced-coagulation-of-aquatic-plant-derived-dissolved-organic-matter-investigation-by-eem-parafac-and-ft-ir-spectroscopy
#5
Shasha Liu, Yuanrong Zhu, Leizhen Liu, Zhongqi He, John P Giesy, Yingchen Bai, Fuhong Sun, Fengchang Wu
Complexation and coagulation of plant-derived dissolved organic matter (DOM) by metal cations are important biogeochemical processes of organic matter in aquatic systems. Thus, coagulation and fractionation of DOM derived from aquatic plants by Ca(II), Al(III), and Fe(III) ions were investigated. Metal ion-induced removal of DOM was determined by analyzing dissolved organic carbon in supernatants after addition of these metal cations individually. After additions of metal ions, both dissolved and coagulated organic fractions were characterized by use of fluorescence excitation emission matrix-parallel factor (EEM-PARAFAC) analysis and Fourier transform infrared (FT-IR) spectroscopy...
December 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29241155/dissolved-organic-matter-reduces-cuo-nanoparticle-toxicity-to-duckweed-in-simulated-natural-systems
#6
Devin A Rippner, Peter G Green, Thomas M Young, Sanjai J Parikh
With increasing demand for recycled wastewater for irrigation purposes, there is a need to evaluate the potential for manufactured nanomaterials in waste water to impact crop production and agroecosystems. Copper oxide nanoparticles (CuO NPs) have previously been shown to negatively impact the growth of duckweed (Landoltia punctata) a model aquatic plant consumed by water fowl and widely found in agricultural runoff ditches in temperate climates. However, prior studies involving CuO NP toxicity to duckweed have focused on systems without the presence of dissolved organic matter (DOM)...
December 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29241136/submillimeter-scale-heterogeneity-of-labile-phosphorus-in-sediments-characterized-by-diffusive-gradients-in-thin-films-and-spatial-analysis
#7
Yuting Meng, Shiming Ding, Mengdan Gong, Musong Chen, Yan Wang, Xianfang Fan, Lei Shi, Chaosheng Zhang
Sediments have a heterogeneous distribution of labile redox-sensitive elements due to a drastic downward transition from oxic to anoxic condition as a result of organic matter degradation. Characterization of the heterogeneous nature of sediments is vital for understanding of small-scale biogeochemical processes. However, there are limited reports on the related specialized methodology. In this study, the monthly distributions of labile phosphorus (P), a redox-sensitive limiting nutrient, were measured in the eutrophic Lake Taihu by Zr-oxide diffusive gradients in thin films (Zr-oxide DGT) on a two-dimensional (2D) submillimeter level...
December 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/29241135/characterization-of-uranium-redox-state-in-organic-rich-eocene-sediments
#8
Susan A Cumberland, Barbara Etschmann, Joël Brugger, Grant Douglas, Katy Evans, Louise Fisher, Peter Kappen, John W Moreau
The presence of organic matter (OM) has a profound impact on uranium (U) redox cycling, either limiting or promoting the mobility of U via binding, reduction, or complexation. To understand the interactions between OM and U, we characterised U oxidation state and speciation in nine OM-rich sediment cores (18 samples), plus a lignite sample from the Mulga Rock polymetallic deposit in Western Australia. Uranium was unevenly dispersed within the analysed samples with 84% of the total U occurring in samples containing >21 wt % OM...
December 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/29241134/effects-of-the-herbicides-linuron-and-s-metolachlor-on-perez-s-frog-embryos
#9
Carla Quintaneiro, Amadeu M V M Soares, Marta S Monteiro
Presence of pesticides in the environment and their possible effects on aquatic organisms are of great concern worldwide. The extensive use of herbicides in agricultural areas are one of the factors contributing to the known decline of amphibian populations. Thus, as non-target species, amphibians can be exposed in early life stages to herbicides in aquatic systems. In this context, this study aims to evaluate effects of increasing concentrations of two maize herbicides, linuron and S-metolachlor on embryos of the Perez' frog (Pelophylax perezi) during 192 h...
November 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/29241133/oxidation-of-%C3%AE-blockers-by-birnessite-kinetics-mechanism-and-effect-of-metal-ions
#10
Yong Chen, Xiye Lu, Lu Liu, Dong Wan, Huabin Chen, Danna Zhou, Virender K Sharma
Manganese dioxides are ubiquitous in natural waters, soils, and sediments and play an important role in oxidative transformation of organic pollutants. This work presents the kinetics of the oxidation of selected β-blockers, betaxolol, metoprolol, and atenolol by birnessite (δ-MnO2) as a function of concentration of the β-blocker, dosage of δ-MnO2, and solution pH. The values of pseudo-first-order rate constants (kobs) of β-blockers decreased in the order betaxolol > atenolol > metoprolol, which was positively correlated with their acid dissociation constants (Ka)...
December 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/29241131/subcellular-distribution-and-chemical-form-of-phosphorus-involved-in-alleviating-phosphorus-toxicity-of-the-phosphorus-accumulator-polygonum-hydropiper
#11
Daihua Ye, Tingxuan Li, Xizhou Zhang, Zicheng Zheng
Polygonum hydropiper is a dominant plant species in Shifang phosphorus (P) mine area and is a promising P-accumulator used for P-phytoextraction. To date, little information is available on the physiological response involved in alleviating P toxicity of P. hydropiper under high P. A pot experiment was carried out to investigate growth, P subcellular distribution, chemical forms in two ecotypes of P. hydropiper under high levels (1, 4, and 8 mmol P L-1) of inorganic P (Pi) and organic P (Po), supplied as KH2PO4 and myo-inositol hexaphosphoric acid dodecasodium salt, respectively...
December 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/29241129/improving-biocathode-community-multifunctionality-by-polarity-inversion-for-simultaneous-bioelectroreduction-processes-in-domestic-wastewater
#12
Hui Yun, Bin Liang, Deyong Kong, Aijie Wang
Bioelectrochemical systems (BESs) have been tentatively applied for wastewater treatment processes, but the complex composition of wastewater could lead to difficulties in establishing functional biofilm or result in performance instability. Few studies have investigated the enrichment of biocathode with domestic wastewater (DW) and the function. A biocathode with multi-pollutant removal capabilities was enriched based on polarity inverted bioanode, which was established with DW. The biocathode function was examined using model pollutants (nitrate, nitrobenzene and Acid Orange 7) supplemented as sole or mixed electron acceptors...
December 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/29241127/high-strength-n-methyl-2-pyrrolidone-containing-process-wastewater-treatment-using-sequencing-batch-reactor-and-membrane-bioreactor-a-feasibility-study
#13
Chun Heng Loh, Bing Wu, Liya Ge, Chaozhi Pan, Rong Wang
N-methyl-2-pyrrolidone (NMP) is widely used as a solvent in polymeric membrane fabrication process, its elimination from the process wastewater (normally at a high concentration > 1000 mg/L) prior to discharge is essential because of environmental concern. This study investigated the feasibility of treating high-strength NMP-containing process wastewater in a sequencing batch reactor (SBR; i.e., batch feeding and intermittent aerobic/anoxic condition) and a membrane bioreactor (MBR; i.e., continuous feeding and aeration), respectively...
December 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/29241126/the-chronic-exposure-to-abamectin-causes-spatial-memory-deficit-and-depressive-behavior-in-mice
#14
Wellington Alves Mizael da Silva, Abraão Tiago Batista Guimarães, Mateus Flores Montalvão, Bruna de Oliveira Mendes, Aline Sueli de Lima Rodrigues, Guilherme Malafaia
It is known that abamectin (ABA), which is a component belonging to the group of avermectins, has been broadly used as biopesticide. Although its effect on non-target aquatic organisms is known, knowledge about its impacts on terrestrial animals such as mammals remains incipient. Thus, we aim at investigating the effects (phycical and neural-behavioral) from the chronic exposure (90 days) to ABA (1/10 of LD50) on Swiss and C57Bl/6J mice from both sexes. Accordingly, at the end of the experimental period the animals were subjected to the following tests: Novel Object Recognition Test (NORT), Morris Water Maze (MWM), Tail Suspension Test (TST), and Forced Swimming Test (FST)...
December 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/29241125/the-enhancement-and-inhibition-of-mercury-reduction-by-natural-organic-matter-in-the-presence-of-shewanella-oneidensis-mr-1
#15
Seyong Lee, Dong-Hun Kim, Kyoung-Woong Kim
Reduction-oxidation (Redox) processes of mercury (Hg) are of significant importance in influencing Hg speciation, bioavailability, and fate in anoxic environments where natural organic matter (NOM) and dissimilatory metal reducing bacteria (DMRB) are widely observed. However, the redox reaction between Hg and NOM, has not yet been studied in the presence of S. oneidensis MR-1 in anoxic environments. We have found that the reduction rate of mercuric mercury [Hg(II)] in the presence of Elliott soil humic acid (ESHA) was 0...
December 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/29241121/nanotitania-crystals-induced-efficient-photocatalytic-color-degradation-antimicrobial-and-larvicidal-activity
#16
Jinu Udayabhanu, Vaitheeswari Kannan, Manish Tiwari, Geetha Natesan, Benelli Giovanni, Venkatachalam Perumal
Textile industries release tonnes of harmful toxic dyes into the environment, causing severe effects on living organisms, including humans. Mosquitoes vectors spread important diseases which cause millions of human deaths worldwide. To control mosquitoes a number of synthetic mosquitocidal agents have been employed but all these pesticides pose harmful effects to human health and non-target species and also led to resistance development in treated vectors. Microbial strains are also developing resistance to the available antibiotics, this currently represents a major public health challenge...
December 6, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29241094/adhesion-of-human-monocytes-to-oxygen-and-nitrogen-containing-plasma-polymers-effect-of-surface-chemistry-and-protein-adsorption
#17
Sara Babaei, Natalie Fekete, Corinne A Hoesli, Pierre-Luc Girard-Lauriault
The interactions between monocytes and biomaterials can potentially be modulated by controlling the chemical and structural surface properties of biomaterials. The objective of this study was to determine the effect of plasma-deposited functional organic coatings on monocyte adhesion and differentiation into macrophages. Organic coatings with varying oxygen and nitrogen concentration were prepared by low-pressure plasma co-polymerization of binary gas mixtures combining a hydrocarbon (butadiene/ethylene) and a heteroatom-containing gas (carbon dioxide/ammonia) to deposit either oxygen or nitrogen-containing coatings...
December 6, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29241088/development-of-an-lc-ms-method-to-quantify-coproporphyrin-i-and-iii-as-endogenous-biomarkers-for-drug-transporter-mediated-drug-drug-interactions
#18
Emmanuel Njumbe Ediage, Lieve Dillen, Ann Vroman, Luc Diels, Annett Kunze, Jan Snoeys, Tom Verhaeghe
Coproporphyrins are proposed as endogenous biomarkers of hepatic Organic Anion Transporting Polypeptide (OATP)1B functional activity. In this study, a new sample extraction method based on a mixed-mode anion exchange sorbent (SPE clean-up using Oasis 30mg Max 96 well plates) was developed for absolute quantification of coproporphyrin I and III (CP-I and CP-III) in human plasma. Chromatographic separation was performed with an Ace Excel 2 C18 PFP, 3μm, 2.1×150mm, maintained at 60°C. A 10mM ammonium formate containing 0...
December 6, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29241078/heteropolytungstate-decorated-core-shell-magnetic-nanoparticles-a-covalent-strategy-for-polyoxometalate-based-hybrid-nanomaterials
#19
Ourania Makrygenni, Emilie Secret, Aude Michel, Dalil Brouri, Vincent Dupuis, Anna Proust, Jean-Michel Siaugue, Richard Villanneau
Amino-functionalized core-shell magnetic nanoparticles have been covalently grafted with Polyoxometalates (POMs). These multifunctional nanocomposites have been obtained through the coupling of heteropolytungstate-based hybrids bearing carboxylic acid functions with aminopropyl functions that decorate the core-shell nanoparticles. The physical properties of the resulting materials have been studied by a large set of techniques. The very good nanostructuration of the POMs at the surface of the obtained nanoparticles have thus been directly observed by high-resolution transmission electronic microscopy (HR-TEM)...
December 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29241055/ph-dependent-reversible-crystal-transformation-of-1-carboxymethyl-1-methyl-pyrrolidinium-bromides-and-their-spectroscopic-fingerprint
#20
Ya-Yan Tong, Heng Zhang, Liang-Liang Chang, Xiao-Peng Xuan
In this work, two 1-carboxymethyl-1-methyl-pyrrolidinium bromides (N-methylpyrrolidine betaine hydrobromides) with the stoichiometry of betaine:hydrobromic acid as 1:1 and 2:1, denoted as CMPRHBr-I and CMPRHBr-II, respectively, were prepared and crystallographically determined. The large difference in these two structures is the type of hydrogen bonds, resulting in the different thermal stability. A strong OH⋯Br hydrogen bond was observed in CMPRHBr-I, whereas O⋯H⋯O hydrogen bond in CMPRHBr-II. Both these two crystals can mutually transform by changing the pH value of the aqueous solution...
November 28, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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