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https://www.readbyqxmd.com/read/28738662/highly-efficient-enrichment-of-low-abundance-intact-proteins-by-core-shell-structured-fe3o4-chitosan-graphene-composites
#1
Peng Zhang, Xiaoni Fang, Guoquan Yan, Mingxia Gao, Xiangmin Zhang
In proteomics research, the screening and monitoring of disease biomarkers is still a major challenge, mainly due to their low concentration in biological samples. However, the universal enrichment of intact proteins has not been further studied. In this work, we developed a Fe3O4-chitosan@graphene (Fe3O4-CS@G) core-shell composite to enrich low-abundance proteins from biological samples. Fe3O4-CS@G composite holds chitosan layer decorated Fe3O4 core, which improves the hydrophilicity of materials greatly. Meanwhile, the graphene nanosheets shell formed via electrostatic assembly endows the composite with huge surface area (178m(2)/g)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738660/novel-biomimetic-enzyme-for-sensitive-detection-of-superoxide-anions
#2
Fang Peng, Tingting Xu, Fan Wu, Chunxue Ma, Yuhong Liu, Jianying Li, Bo Zhao, Chun Mao
Superoxide anion (O2(•-)), one of the most active reactive oxygen species (ROS) in micro-environment of the human body, is involved in some diseases if there is excess O2(•-) associated with oxidative stress. Accurate detection of its concentration has important medical diagnostic significance. In this work, a new electrochemical sensor was designed and fabricated for sensitive detection based on Mn-superoxide dismutase (MnSOD) that decorated onto the surface of magnetic polymeric nanotubes by surface self-assembly processes...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738634/determination-of-synthetic-phosphodiesterase-5-inhibitors-by-lc-ms-2-in-waters-and-human-urine-submitted-to-dispersive-liquid-liquid-microextraction
#3
Natalia Campillo, Javier Marín, José Fenoll, Isabel Garrido, Ignacio López-García, Manuel Hernández-Córdoba, Pilar Viñas
High-performance liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI-MS(2)) with a triple quadrupole is proposed for determining the synthetic phosphodiesterase-5 inhibitors, sildenafil, tadalafil and vardenafil, and the active metabolite N-desmethyl sildenafil. The method was successfully applied to the analysis of waters of different origins and human urine samples. Dispersive liquid-liquid microextraction (DLLME) was applied in the classical way for water analysis, whereas a previous extraction into an organic solvent was necessary for urine samples, the acetonitrile extract being used as dispersant solvent in the DLLME step...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738611/a-novel-electrochemical-sensor-based-on-wo3-nanorods-decorated-poly-sodium-4-styrenesulfonate-functionalized-graphene-nanocomposite-modified-electrode-for-detecting-of-puerarin
#4
Shasha Jing, Huijun Zheng, Li Zhao, Lingbo Qu, Lanlan Yu
An electrochemical sensing platform was fabricated based on composition of poly(sodium 4-styrenesulfonate) (PSS), graphene (GN) and WO3 nanorods on glassy carbon electrode (GCE). The PSS-GN/WO3 nanocomposite significantly increased the oxidative activity of puerarin due to the individual merit and mutual effect of PSS-GN and WO3 nanorods which improved the performance of the electrochemical sensor with high sensitivity. Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) measurements were used for the detection of puerarin...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738555/assessment-of-mercury-speciation-in-feathers-using-species-specific-isotope-dilution-analysis
#5
Marina Renedo, Paco Bustamante, Emmanuel Tessier, Zoyne Pedrero, Yves Cherel, David Amouroux
Seabirds are considered as effective sentinels of environmental marine contamination and their feathers are extensively used as non-lethal samples for contaminant biomonitoring. This tissue represents the main route for mercury (Hg) elimination in seabirds and contains predominantly methylmercury (MeHg). In this work, we developed a robust analytical technique for precise and accurate simultaneous quantification of MeHg, inorganic Hg (iHg) and consequently total Hg (THg), in feathers by gas-chromatography (GC)-ICPMS analyses using species-specific isotope dilution technique...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738548/effect-of-thiosulfate-on-rapid-start-up-of-sulfur-based-reduction-of-high-concentrated-perchlorate-a-study-of-kinetics-extracellular-polymeric-substances-eps-and-bacterial-community-structure
#6
Jianbo Guo, Chao Zhang, Jing Lian, Caicai Lu, Zhi Chen, Yuanyuan Song, Yankai Guo, Yajuan Xing
Perchlorate (ClO4(-)) contamination is more and more concerned due to the hazards to humans. Based on the common primary bacterium (Helicobacteraceae) of both thiosulfate-acclimated sludge (T-Acc) and sulfur-acclimated sludge (S-Acc) for perchlorate reduction, the rapid start-up of sulfur-based perchlorate reduction reactor (SBPRR) was hypothesized by inoculating T-Acc. Furthermore, the performance of SBPRR, the SO4(2-) yield, kinetics of ClO4(-) reduction and the extracellular polymeric substances (EPS) of biofilm confirmed the hypothesis...
July 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28738507/gender-specific-associations-between-serum-isomers-of-perfluoroalkyl-substances-and-blood-pressure-among-chinese-isomers-of-c8-health-project-in-china
#7
Wen-Wen Bao, Zhengmin Min Qian, Sarah Dee Geiger, Echu Liu, Yimin Liu, Si-Quan Wang, Wayne R Lawrence, Bo-Yi Yang, Li-Wen Hu, Xiao-Wen Zeng, Guang-Hui Dong
Previous studies have demonstrated associations of perfluoroalkyl substances (PFASs), a group of highly persistent chemicals ubiquitous in wildlife and humans, with hypertension, but the relationships are mixed. Furthermore, academic literature on the relationship between isomers of PFASs and blood pressure (BP) and hypertension in populations from a higher pollution area is scant. We studied 1612 Chinese adults, ages 22-96years old, from Shenyang, China, utilizing high performance liquid chromatography-mass spectrometry to analyze isomers of perfluorooctanesulfonate (PFOS), perfluorooctanoate (PFOA), and other PFASs in blood serum...
July 18, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28738425/preparation-and-characterization-of-pegylated-iron-oxide-gold-nanoparticles-for-delivery-of-sulforaphane-and-curcumin
#8
Hossein Danafar, Ali Sharafi, Sonia Askarlou, Hamidreza Kheiri Manjili
Natural products have been used for the treatment of various diseases such as cancer. Curcumin (CUR) and sulforaphane (SF) have anti-cancer effects, but their application is restricted because of their low water solubility and poor oral bioavailability. To improve the bioavailability and solubility of SF and CUR, we performed an advanced delivery of SF and CUR with PEGylated gold coated Fe3O4 magnetic nanoparticles (PEGylated Fe3O4@Au NPs) to endorse SF and CUR maintenance as an effective and promising antitumor drugs...
July 24, 2017: Drug Research
https://www.readbyqxmd.com/read/28738417/a-pharmacodynamic-analysis-of-choroidal-neovascularization-in-a-porcine-model-using-three-targeted-drugs
#9
Jeffrey Tran, Caroline Craven, Kathy Wabner, Jenn Schmit, Brock Matter, Uday Kompella, Hans E Grossniklaus, Timothy W Olsen
Purpose: To compare the efficacy of microneedle-delivered suprachoroidal (SC) pazopanib to intravitreal (Ivit) delivery of pazopanib, bevacizumab, or a fusion protein hI-con1 versus vehicle controls on choroidal neovascularization (CNV) growth in a pig model. Methods: Forty-one pigs were injected on the day of CNV induction (hI-con1 on postinduction day 14) with either 2.5 mg Ivit bevacizumab (n = 9), 1 mg Ivit pazopanib (n = 9), 300 Ivit μg hI-con1 (n = 4), or 1 mg SC pazopanib (n = 9), vs...
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28738415/monocarboxylate-transporters-mediate-fluorescein-uptake-in-corneal-epithelial-cells
#10
Yi-Chen Sun, Hau-Min Liou, Po-Ting Yeh, Wei-Li Chen, Fung-Rong Hu
Purpose: To determine the presence of monocarboxylate transporter (MCT) in human and rabbit corneal epithelium and its role in transcellular fluorescein transportation in the cornea. Methods: The presence of MCTs in human and rabbit corneal epithelium was determined by RT-PCR and immunohistochemistry. Intracellular fluorescein uptake experiment was performed using cultured human corneal epithelial cells (HCECs). The involvement of MCT in fluorescein uptake was determined by addition of MCT inhibitors to HCECs and acute dry eye model on New Zealand albino rabbits by spectrophotometry, corneal impression cytology, and external eye photographs...
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28738230/fluorinated-tripodal-receptors-for-potentiometric-chloride-detection-in-biological-fluids
#11
Nadezda Pankratova, Maria Cuartero, Laura A Jowett, Ethan N W Howe, Philip A Gale, Eric Bakker, Gastón A Crespo
Fluorinated tripodal compounds were recently reported to be efficient transmembrane transporters for a series of inorganic anions. In particular, this class of receptors has been shown to be suitable for the effective complexation of chloride, nitrate, bicarbonate and sulfate anions via hydrogen bonding. The potentiometric properties of urea and thiourea-based fluorinated tripodal receptors are explored here for the first time, in light of the need for reliable sensors for chloride monitoring in undiluted biological fluids...
July 8, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28738201/interbasin-water-transfer-for-the-rehabilitation-of-a-transboundary-mediterranean-stream-an-economic-analysis
#12
Ariel Akron, Andrea Ghermandi, Tamar Dayan, Yaron Hershkovitz
Global demand for freshwater is increasing as human population grows, climate changes and water resources are being overexploited. Consequently, many freshwater ecosystems, particularly in water-stressed regions, are severely degraded. Here we present a unique case of an Interbasin Water Transfer (IWT) project aiming at ecosystem rehabilitation and recreation enhancement of an intermittent transboundary stream (Ayun, Israel). For the past century, water diversion at the Lebanese side had led to flow secession in the Israeli Ayun Nature Reserve during the dry season (May-November)...
July 21, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28738127/early-onset-alzheimer-disease-and-candidate-risk-genes-involved-in-endolysosomal-transport
#13
Brian W Kunkle, Badri N Vardarajan, Adam C Naj, Patrice L Whitehead, Sophie Rolati, Susan Slifer, Regina M Carney, Michael L Cuccaro, Jeffery M Vance, John R Gilbert, Li-San Wang, Lindsay A Farrer, Christiane Reitz, Jonathan L Haines, Gary W Beecham, Eden R Martin, Gerard D Schellenberg, Richard P Mayeux, Margaret A Pericak-Vance
Importance: Mutations in APP, PSEN1, and PSEN2 lead to early-onset Alzheimer disease (EOAD) but account for only approximately 11% of EOAD overall, leaving most of the genetic risk for the most severe form of Alzheimer disease unexplained. This extreme phenotype likely harbors highly penetrant risk variants, making it primed for discovery of novel risk genes and pathways for AD. Objective: To search for rare variants contributing to the risk for EOAD. Design, Setting, and Participants: In this case-control study, whole-exome sequencing (WES) was performed in 51 non-Hispanic white (NHW) patients with EOAD (age at onset <65 years) and 19 Caribbean Hispanic families previously screened as negative for established APP, PSEN1, and PSEN2 causal variants...
July 24, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28738091/the-second-window-icg-technique-demonstrates-a-broad-plateau-period-for-near-infrared-fluorescence-tumor-contrast-in-glioblastoma
#14
Ryan Zeh, Saad Sheikh, Leilei Xia, John Pierce, Andrew Newton, Jarrod Predina, Steve Cho, MacLean Nasrallah, Sunil Singhal, Jay Dorsey, John Y K Lee
INTRODUCTION: Fluorescence-guided surgery has emerged as a powerful tool to detect, localize and resect tumors in the operative setting. Our laboratory has pioneered a novel way to administer an FDA-approved near-infrared (NIR) contrast agent to help surgeons with this task. This technique, coined Second Window ICG, exploits the natural permeability of tumor vasculature and its poor clearance to deliver high doses of indocyanine green (ICG) to tumors. This technique differs substantially from established ICG video angiography techniques that visualize ICG within minutes of injection...
2017: PloS One
https://www.readbyqxmd.com/read/28738073/the-n-terminal-region-of-serum-amyloid-a3-protein-activates-nf-%C3%AE%C2%BAb-and-up-regulates-muc2-mucin-mrna-expression-in-mouse-colonic-epithelial-cells
#15
Manami Tashiro, Ami Iwata, Marika Yamauchi, Kaori Shimizu, Ayaka Okada, Naotaka Ishiguro, Yasuo Inoshima
Serum amyloid A (SAA) is the major acute-phase protein and a precursor of amyloid A (AA) in AA amyloidosis in humans and animals. SAA isoforms have been identified in a wide variety of animals, such as SAA1, SAA2, SAA3, and SAA4 in mouse. Although the biological functions of SAA isoforms are not completely understood, recent studies have suggested that SAA3 plays a role in host defense. Expression of SAA3 is increased on the mouse colon surface in the presence of microbiota in vivo, and it increases mRNA expression of mucin 2 (MUC2) in murine colonic epithelial cells in vitro, which constitutes a protective mucus barrier in the intestinal tract...
2017: PloS One
https://www.readbyqxmd.com/read/28738003/pharmacokinetics-and-egg-residues-after-oral-administration-of-a-single-dose-of-meloxicam-in-domestic-chickens-gallus-domesticus
#16
Marcy J Souza, Joan B Bergman, Molly S White, Kristen I Gordon, Lillian E Gerhardt, Sherry K Cox
OBJECTIVE To determine the pharmacokinetics of meloxicam in domestic hens and duration and quantity of drug residues in their eggs following PO administration of a single dose (1 mg of meloxicam/kg). ANIMALS 8 healthy adult White Leghorn hens. PROCEDURES Hens were administered 1 mg of meloxicam/kg PO once. A blood sample was collected immediately before and at intervals up to 48 hours after drug administration. The hens' eggs were collected for 3 weeks after drug administration. Samples of the hens' plasma, egg whites (albumen), and egg yolks were analyzed by high-performance liquid chromatography...
August 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28737923/co-silencing-intestinal-transglutaminase-2-and-interleukin-15-using-gelatin-based-nanoparticles-in-an-in-vitro-model-of-celiac-disease
#17
Husain Attarwala, Valerie Clausen, Prasoon Chaturvedi, Mansoor M Amiji
In this study, we have developed type B gelatin-based nanoparticle based siRNA delivery system for silencing of intestinal transglutaminase-2 (TG2) and interleukin-15 (IL-15) genes in cultured human intestinal epithelial cells (Caco-2) and murine alveolar macrophage cells (J774A.1). Small interfering RNA (siRNA) targeting the TG2 or IL-15 gene was encapsulated within gelatin nanoparticles using ethanol-water solvent displacement method. Size, charge and morphology of gelatin nanoparticles were evaluated using Zetasizer instrument and transmission electron microscopy...
July 24, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28737905/metabolism-of-t-2-toxin-in-farm-animals-and-human-in-vitro-and-in-chickens-in-vivo-using-ultra-high-performance-liquid-chromatography-quadrupole-time-of-flight-hybrid-mass-spectrometry-along-with-online-hydrogen-deuterium-exchange-technique
#18
Shupeng Yang, Marthe De Boevre, Huiyan Zhang, Karl De Ruyck, Feifei Sun, Jinzhen Zhang, Yue Jin, Yanshen Li, Zhanhui Wang, Suxia Zhang, Jinhui Zhou, Yi Li, Sarah De Saeger
After incubated with animals' and human liver microsomes, metabolites of phase I and II were investigated. A comparison was performed by ultrahigh performance liquid chromatography-quadrupole/time-of-flight coupled to mass spectrometry (UHPLC-Q/TOF). Consequently, a total of four phase I metabolites and three glucuronide binding metabolites of T-2 toxin were discovered. Although a significant metabolic difference was observed among six species, HT-2 toxin was the major product in all species. In addition, the in vivo metabolism of T-2 toxin after oral administration was also investigated in chickens, In total, 18 metabolites were detected, of which 13 were novel, to our knowledge, and reported for the first time...
July 24, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28737902/absorption-of-low-energy-uv-radiation-by-human-telomere-g-quadruplexes-generates-long-lived-guanine-radical-cations
#19
Akos Banyasz, Lara Martínez-Fernández, Clémence Balty, Marion Perron, Thierry Douki, Roberto Improta, Dimitra Markovitsi
Telomeres, which are involved in cell division, carcinogenesis, and aging and constitute important therapeutic targets, are prone to oxidative damage. This propensity has been correlated with the presence of guanine-rich sequences, capable of forming four-stranded DNA structures (G-quadruplexes). Here, we present the first study on oxidative damage of human telomere G-quadruplexes without mediation of external molecules. Our investigation has been performed for G-quadruplexes formed by folding of GGG(TTAGGG)3 single strands in buffered solutions containing Na(+) cations (TEL21/Na(+))...
July 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28737890/a-difluoroboron-%C3%AE-diketonate-probe-shows-turn-on-near-infrared-fluorescence-specific-for-tau-fibrils
#20
Kwang-Su Park, Mi Kyoung Kim, Yujin Seo, Taewoong Ha, Kyeongha Yoo, Seung Jae Hyeon, Yu Jin Hwang, Junghee Lee, Hoon Ryu, Hyunah Choo, Youhoon Chong
Tau aggregation in neuronal cells has recently received significant attention as a robust predictor of the progression of Alzheimer's disease (AD) because of its proven correlation with the degree of cognitive impairment in AD patients. Accordingly, non-invasive imaging of tau aggregates has been highlighted as a promising diagnostic tool for AD. We have previously identified a tau-specific "turn-on" near-infrared fluorescent (NIRF) probe (1) and, in this study, structural modification was performed to optimize its physicochemical as well as fluorescence properties...
July 24, 2017: ACS Chemical Neuroscience
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