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https://www.readbyqxmd.com/read/29793143/oxidation-at-c-16-enhances-butyrylcholinesterase-inhibition-in-lupane-triterpenoids
#1
María Julia Castro, Victoria Richmond, María Belén Faraoni, Ana Paula Murray
A set of triterpenoids with different grades of oxidation in the lupane skeleton were prepared and evaluated as cholinesterase inhibitors. Allylic oxidation with selenium oxide and Jones's oxidation were employed to obtain mono-, di- and tri-oxolupanes, starting from calenduladiol (1) and lupeol (3). All the derivatives showed a selective inhibition of butyrylcholinesterase over acetylcholinesterase (BChE vs. AChE). A kinetic study proved that compounds 2 and 9, the more potent inhibitors of the series, act as competitive inhibitors...
May 17, 2018: Bioorganic Chemistry
https://www.readbyqxmd.com/read/29793118/efficient-resource-recycling-from-liquid-digestate-by-microalgae-yeast-mixed-culture-and-the-assessment-of-key-gene-transcription-related-to-nitrogen-assimilation-in-microalgae
#2
Lei Qin, Lu Liu, Zhongming Wang, Weining Chen, Dong Wei
To determine the feasibility of microalgae-yeast mixed culture using the liquid digestate of dairy wastewater (LDDW) for biofuels and single cell protein (SCP) production, the cell growth, nutrient removal and outputs evaluation of the mono and mixed culture of Chlorella vulgaris and Yarrowia lipolytica in LDDW were investigated by adding glycerol as carbon source. The results showed that the mixed culture could enhance the biological utilization efficiency of nitrogen and phosphorus, and obtain higher yield of biomass (1...
May 18, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29792956/development-of-photo-modified-starch-kefiran-tio-2-bio-nanocomposite-as-an-environmentally-friendly-food-packaging-material
#3
Vahid Goudarzi, Iman Shahabi-Ghahfarrokhi
This paper reports on an experiment in which starch/kefiran/TiO2 (SKT)-based bio-nanocomposite films were developed and modified by photo-chemical reaction. In so doing, film-forming solutions were exposed to ultraviolet A (UV-A) for different times (1, 6, and 12 h). The obtained results indicated that increasing UV-A exposure time brought about an increase (≈14.9%) in the tensile strength of bio-nanocomposites. However, elongation at break and Young's modulus of irradiated film specimen decreased (≈32%, ≈12%, respectively) by increasing UV-A exposure time, and the moisture-sensitive parameters of specimen decreased using UV-A irradiation...
May 21, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29792688/rhodium-complexes-bearing-palp-pincer-ligands
#4
Naofumi Hara, Teruhiko Saito, Kazuhiko Semba, Nishamol Kuriakose, Hong Zheng, Shigeyoshi Sakaki, Yoshiaki Nakao
We report rhodium complexes bearing PAlP pincer ligands with an X-type alumanyl moiety. IR spectroscopy and single-crystal X-ray diffraction analysis of a carbonyl complex exhibit the considerable σ-donating ability of the alumanyl ligand, whose Lewis acidity is confirmed through coordination of pyridine to the aluminum center. The X-type PAlP-Rh complexes catalyze C2-selective mono-alkylation of pyridine with alkenes.
May 24, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29791794/photolysis-of-mono-and-di-chloramines-in-uv-hydrogen-peroxide-effects-on-1-4-dioxane-removal-and-relevance-in-water-reuse
#5
Samuel Patton, Mariano Romano, Vincenzo Naddeo, Kenneth P Ishida, Haizhou Liu
Growing demands and increasing scarcity of fresh water resources necessitate potable water reuse, which has been implemented with the aid of UV-based advanced oxidation processes (UV/AOPs) that remove potentially hazardous trace organic contaminants from reclaimed water. During the potable reuse treatment process, chloramines are added to prevent membrane fouling that are carried over to the UV/AOP, where hydrogen peroxide (H2O2) is commonly added. However, the impact of chloramines on the photolysis of H2O2 and the overall performance of the UV/AOP remains unknown...
May 23, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29790809/characterization-of-in-vitro-and-in-vivo-metabolism-of-leelamine-using-liquid-chromatography-tandem-mass-spectrometry
#6
Riya Shrestha, Jung Jae Jo, DooHyun Lee, Taeho Lee, Sangkyu Lee
1. Leelamine is a diterpene compound found in the bark of pine trees and has garnered considerable interest owing to its potent anticancer properties. The aim of the present study was to investigate the metabolic profile of leelamine in human liver microsomes (HLMs) and mice using liquid chromatography-tandem mass spectrometry (LC-MS/MS). 2. We found that leelamine undergoes only Phase I metabolism, which generates one metabolite that is mono-hydroxylated at the C9 carbon of the octahydrophenanthrene ring (M1) both in vitro and in vivo...
May 23, 2018: Xenobiotica; the Fate of Foreign Compounds in Biological Systems
https://www.readbyqxmd.com/read/29790756/studies-on-aculeines-synthetic-strategy-to-the-fully-protected-protoaculeine-b-the-n-terminal-amino-acid-of-aculeine-b
#7
Hiroki Shiozaki, Masayoshi Miyahara, Kazunori Otsuka, Kei Miyako, Akito Honda, Yuichi Takasaki, Satoshi Takamizawa, Hideyuki Tukada, Yuichi Ishikawa, Ryuichi Sakai, Masato Oikawa
A synthetic strategy for accessing protoaculeine B (1), the N-terminal amino acid of the highly modified peptide toxin aculeine, was developed via the synthesis of the fully protected natural homologue of 1 with a 12-mer poly(propanediamine). The synthesis of mono(propanediamine) analog 2, as well as core amino acid 3, was demonstrated by this strategy. New amino acid 3 induced convulsions in mice; however, compound 2 showed no such activity.
May 23, 2018: Organic Letters
https://www.readbyqxmd.com/read/29789842/synthesis-of-%C3%AE-cf-3-and-%C3%AE-cf-2-h-amines-via-the-aminofluorination-of-fluorinated-alkenes
#8
Ling Yang, Wen-Xin Fan, E Lin, Dong-Hang Tan, Qingjiang Li, Honggen Wang
A novel synthesis of α-CF3 and α-CF2H amines via the aminofluorination of gem-difluoroalkenes and mono-fluoroalkenes, respectively, is reported. The method employs Selectfluor as an electrophilic fluorine source and acetonitrile as a nitrogen source. Mechanistic studies revealed a single-electron oxidation/fluorine-abstraction/Ritter-type amination pathway. The protocol allowed the synthesis of a broad range of fluorinated amines including those bearing quaternary carbon centers with good efficiency and functional group tolerance...
May 23, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29789171/n-propyl-n-2-pyridylurea-modified-silica-as-mixed-mode-stationary-phase-with-moderate-weak-anion-exchange-capacity-and-ph-dependent-surface-charge-reversal
#9
Stefanie Bäurer, Stefan Polnick, Orlando L Sánchez-Muñoz, Markus Kramer, Michael Lämmerhofer
Herein, we present a novel silica-based stationary phase modified with N-propyl-N'-2-pyridylurea selector. Due to the weakly basic properties of the pyridine selector and the presence of residual silanols after selector immobilization, a zwitterionic surface with a pI observed at approximately pH 5.5 was measured by electrophoretic light scattering in pH-dependent ζ-potential determinations. The capability of the new N-propyl-N'-2-pyridylurea-modified silica to serve as mixed-mode stationary phase was investigated...
May 7, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29788736/evaluation-of-overall-survival-rate-of-different-therapies-in-the-treatment-of-t1-t3-prostate-cancer-a-network-meta-analysis
#10
S Y Chen, Y Du, Q Shao, J S Li, H Y Chen
We performed this network meta-analysis (NMA) in order to compare the overall survival rate of six different therapies of T1-T3 prostate cancer (PC). The therapies include radiotherapy (RT), endocrine therapy (ET), Cryoablation (CRYO), radical prostatectomy (RP), RT+ET and RP+ET. Pubmed, Embase, Cochrane Library, Google Scholar, Web of Science and MEDLINE were searched to collect relevant literature from the inception of the study till February 2017. Cohort studies meeting the inclusion criteria were included in the study...
March 14, 2018: Neoplasma
https://www.readbyqxmd.com/read/29788161/new-reagents-for-poultry-research-preparation-purification-and-in-vitro-evaluation-of-non-pegylated-and-mono-pegylated-chicken-prolactin
#11
Ewa Oclon, Gili Solomon, Anna Hrabia, Shelly Druyan, Zvi Hayouka, Arieh Gertler
Recombinant chicken prolactin (chPRL), expressed in Escherichia coli and purified as a monomer, was successfully PEGylated and purified to homogeneity as a mono-PEGylated protein (PEG-chPRL). Its biological activity was estimated by its ability to interact with human prolactin receptor extracellular domain (hPRLR-ECD) and stimulate PRLR-mediated proliferation in Nb2-11C cells. PEG-chPRL activity in a cell bioassay was 10-fold lower than that of non-PEGylated chPRL, but only 2-fold lower in a binding assay to hPRLR-ECD...
May 18, 2018: Poultry Science
https://www.readbyqxmd.com/read/29787906/the-use-of-combined-treatments-for-reducing-parabens-in-surface-waters-ion-exchange-resin-and-nanofiltration
#12
Carmen M López-Ortiz, Irene Sentana-Gadea, Pedro Varó-Galvañ, Salvador E Maestre-Pérez, Daniel Prats-Rico
In this study, the removal of parabens from waters, using a combined treatment of magnetic ion exchange resins and subsequent filtration through nanofiltration membranes, was investigated. The selected parabens were methylparaben, ethylparaben, propylparaben and butylparaben. Two different magnetic anionic exchanger resins, MIEX® DOC and MIEX® GOLD, and two nanofiltration membranes (NF), NF-90 and DESAL-HL, were tested. The study was carried out using mono and multicomponent systems, using deionized water and natural waters sampled from two different rivers...
May 19, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29787847/leaves-and-stem-bark-from-allophylus-africanus-p-beauv-an-approach-to-anti-inflammatory-properties-and-characterization-of-their-flavonoid-profile
#13
Federico Ferreres, Nelson G M Gomes, Patrícia Valentão, David M Pereira, Angel Gil-Izquierdo, Luísa Araújo, Tânia C Silva, Paula B Andrade
The small tree Allophylus africanus, widespread in the African continent, has long been considered valuable, as noted by the number of reports on their multiple medicinal uses. With this work, we aimed to extend the current, and so far restricted, knowledge on the chemical composition of the plant, particularly as source of flavonoids, as well as to assess its potential anti-inflammatory properties. The chemical characterization of the aqueous extract obtained from the leaves allowed the identification and quantitation of 30 flavones, predominantly apigenin derivatives, but also four luteolin derivatives, while the stem bark extract was solely characterized by apigenin di-C-glycosides and mono-C-glycosides-O-glycosylated...
May 19, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29787679/dynamic-proteome-alteration-and-functional-modulation-of-human-saliva-induced-by-dietary-chemosensory-stimuli
#14
Matthias Bader, Andreas Dunkel, Mareike Wenning, Bernd Kohler, Guillaume Medard, Estela Del Castillo, Amin Gholami, Bernhard Kuster, Siegfried Scherer, Thomas Hofmann
Saliva flow measurements and SDS-PAGE separation of human whole saliva freshly collected after oral stimulation with citric acid (sour), aspartame (sweet), iso-α-acids (bitter), mono sodium L-glutamate (umami), NaCl (salty), 6-gingerol (pungent), hydroxy-α-sanshool (tingling), and hydroxy-β-sanshool (numbing), followed by tryptic digestion, nano-HPLC-MS/MS, and label-free protein quantitation demonstrated a stimulus- and time-dependent influence of the dietary chemosensates on salivation and the salivary proteome composition...
May 22, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29787675/a-metal-stabilized-quinoidal-dibenzo-g-p-chrysene-fused-bis-dicarbacorrole-system
#15
Xian-Sheng Ke, Yongseok Hong, Vincent M Lynch, Dongho Kim, Jonathan L Sessler
We report here a metal complexation-based strategy that permits access to a highly stable expanded porphyrin-type quinoidal PAH. Specifically, double insertion of Pd(II) ions into a dibenzo[g,p]chrysene-fused bis-dicarbacorrole (bis-H3) gives rise to a bis-metalated species (bis-Pd) that undergoes a facile benzenoid-quinonoid transformation. In contrast to what is true for the corre-sponding mono-Pd(II) complex, which has organic radical character, well resolved 1H- and 19F NMR spectra are seen for bis-Pd. This complex is also electron paramagnetic resonance (EPR) silent over a range of temperatures...
May 22, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29787280/transition-metal-free-regioselective-cross-coupling-controlled-synthesis-of-mono-or-dithiolation-indolizines
#16
Bin Li, Zhiyu Chen, Hua Cao, Hong Zhao
An efficient transition-metal-free regioselective C-H/S-H cross-coupling of indolizines with thiols has been developed for the first time to describe a workable route to indolizine thioethers. This finding provides a new method and more straightforward pathway for controllable synthesis of mono- or dithiolation indolizines that are otherwise difficult to obtain by the literature methods. The reaction exhibits good functional group tolerance and high efficiency and affords the products in good to excellent yields...
May 22, 2018: Organic Letters
https://www.readbyqxmd.com/read/29785833/species-differences-in-bile-acids-i-plasma-and-urine-bile-acid-composition
#17
Rhishikesh Thakare, Jawaher Abdullah Alamoudi, Nagsen Gautam, A David Rodrigues, Yazen Alnouti
Maintenance of bile acid (BA) homeostasis is essential to achieve their physiologic functions and avoid their toxic effects. The marked differences in BA composition between preclinical safety models and humans may play a major role in the poor prediction of drug-induced liver injury using preclinical models. We compared the composition of plasma and urinary BAs and their metabolites between humans and several animal species. Total BA pools and their composition varied widely among different species. Highest sulfation of BAs was observed in human and chimpanzee...
May 21, 2018: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29785468/competition-for-electrons-between-mono-oxygenations-of-pyridine-and-2-hydroxypyridine
#18
Chao Yang, Yingxia Tang, Hua Xu, Ning Yan, Naiyu Li, Yongming Zhang, Bruce E Rittmann
Pyridine and its heterocyclic derivatives are widely encountered in industrial wastewaters, and they are relatively recalcitrant to biodegradation. Pyridine biodegradation is initiated by two mono-oxygenation reactions that compete for intracellular electron donor (2H). In our experiments, UV photolysis of pyridine generated succinate, whose oxidation augmented the intracellular electron donor and accelerated pyridine biodegradation and mineralization. The first mono-oxygenation reaction always was faster than the second one, because electrons provided by intracellular electron donors were preferentially utilized by the first mono-oxygenase; this was true even when the concentration of 2HP was greater than the concentration of pyridine...
May 21, 2018: Biodegradation
https://www.readbyqxmd.com/read/29785268/impact-of-fullerene-derivative-isomeric-purity-on-the-performance-of-inverted-planar-perovskite-solar-cells
#19
Edison Castro, Gerardo Zavala, Sairaman Seetharaman, Francis D'Souza, Luis Echegoyen
The effect of utilizing a pure cis -α-dimethoxy carbonyl fulleropyrrolidine C70 (DMEC70 ) isomer as the electron transporting material (ETM) in inverted perovskite solar cells (PSCs) was evaluated. The as-prepared C70 mono-adduct products are mixtures of regioisomers and the interest was to evaluate them independently as ETMs. Three different cis -DMEC70 isomers (α, β- endo and β- exo ) (mix-DMEC70 ) were synthesized and purified by HPLC. It was found that PSCs based on the pure α-DMEC70 exhibit a substantially enhanced maximum power conversion efficiency (PCE) of 18...
September 28, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/29784884/the-effector-gene-xopae-of-xanthomonas-euvesicatoria-85-10-is-part-of-an-operon-and-encodes-an-e3-ubiquitin-ligase
#20
Georgy Popov, Bharat Bhusan Majhi, Guido Sessa
The type III effector XopAE from the Xanthomonas euvesicatoria strain 85-10 ( Xe 85-10) was previously shown to inhibit plant immunity and enhance pathogen-induced disease symptoms. Evolutionary analysis of 60 xopAE alleles ( AEal ) revealed that the xopAE locus is conserved in multiple Xanthomonas species. The majority of xopAE alleles (55 out of 60) encodes a single ORF ( xopAE ), while in 5 alleles, including AEal 37 of the Xe 85-10 strain, a frame-shift splits the locus into two ORFs ( hpaF and a truncated xopAE )...
May 21, 2018: Journal of Bacteriology
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