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https://www.readbyqxmd.com/read/28090219/integrated-microfluidic-aptasensor-for-mass-spectrometric-detection-of-vasopressin-in-human-plasma-ultrafiltrate
#1
J Yang, J Zhu, R Pei, J A Oliver, D W Landry, M N Stojanovic, Q Lin
We present a microfluidic aptamer-based biosensor for detection of low-molecular-weight biomarkers in patient samples. Using a microfluidic device that integrates aptamer-based specific analyte extraction, isocratic elution, and detection by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry, we demonstrate rapid, sensitive and label-free detection of arginine vasopressin (AVP) in human plasma ultrafiltrate. AVP molecules in complex matrices are specifically captured by an aptamer that is immobilized on microbeads via affinity binding in a microchamber...
July 14, 2016: Analytical Methods: Advancing Methods and Applications
https://www.readbyqxmd.com/read/28089067/effect-of-mobile-phase-additives-on-solute-retention-at-low-aqueous-ph-in-hydrophilic-interaction-liquid-chromatography
#2
David V McCalley
Trifluoracetic acid (TFA) added to the aqueous acetonitrile mobile phase induces some unexpected changes in the ionic component of retention in hydrophilic interaction separations when using Type B silica and amide-bonded silica columns. TFA use results in anion exchange properties which contrast with the cation exchange typically found with ammonium salt buffers. The significant cation exchange properties of silica hydride columns are also moderated by TFA. Similar behaviour was shown in a metal- free amide column operated on a system washed with a metal complexing agent, suggesting that adsorbed metal cations were not responsible for this anion exchange behaviour...
December 15, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28069199/synergistic-effects-of-ultrasonication-and-ethanol-washing-in-controlling-the-stoichiometry-phase-purity-and-morphology-of-rare-earth-doped-ceria-nanoparticles
#3
Kushal Singh, Rishu Kumar, Anirban Chowdhury
Over a period of last thirty years, use of ethanol has been historically reported for obtaining nanopowders with low agglomeration for various oxide systems. In addition to these benefits, we show for the first time that treatments in ethanol medium coupled with an ultrasonication step can impart crucial additional advantages in controlling the phase purity and stoichiometry/composition for such systems. This is an important issue especially for any complex multicationic oxide nanoparticles system and hence we selected one of the most popular catalyst systems of doped-ceria (CeO2) nanoparticles with very high (50%) level of rare-earth (lanthanum) doping for this case study...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069167/effect-of-mobile-phase-additives-on-solute-retention-at-low-aqueous-ph-in-hydrophilic-interaction-liquid-chromatography
#4
David V McCalley
Trifluoracetic acid (TFA) added to the aqueous acetonitrile mobile phase induces some unexpected changes in the ionic component of retention in hydrophilic interaction separations when using Type B silica and amide-bonded silica columns. TFA use results in anion exchange properties which contrast with the cation exchange typically found with ammonium salt buffers. The significant cation exchange properties of silica hydride columns are also moderated by TFA. Similar behaviour was shown in a metal- free amide column operated on a system washed with a metal complexing agent, suggesting that adsorbed metal cations were not responsible for this anion exchange behaviour...
December 15, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28060912/early-fesoterodine-fumarate-administration-prevents-neurogenic-detrusor-overactivity-in-a-spinal-cord-transected-rat-model
#5
Xavier Biardeau, Mikolaj Przydacz, Shachar Aharony, George Loutochin, Lysanne Campeau, Maeva Kyheng, Jacques Corcos
BACKGROUND: In spinal cord injury, onset of detrusor overactivity (DO) is detrimental for quality of life (incontinence) and renal risk. Prevention has only been achieved with complex sophisticated electrical neuromodulation techniques. PURPOSE: To assess the efficacy of early fesoterodine fumarate (FF) administration in preventing bladder overactivity in a spinal cord transected (SCT) rat model. METHODS: 33 Sprague-Dawley rats were allocated to 6 groups-Group 1: 3 normal controls; Group 2: 6 SCT controls; Group 3: 6 SCT rats + FF 0...
2017: PloS One
https://www.readbyqxmd.com/read/28054967/expression-purification-and-biophysical-characterization-of-a-secreted-anthrax-decoy-fusion-protein-in-nicotiana-benthamiana
#6
Kalimuthu Karuppanan, Sifti Duhra-Gill, Muchena J Kailemia, My L Phu, Carlito B Lebrilla, Abhaya M Dandekar, Raymond L Rodriguez, Somen Nandi, Karen A McDonald
Anthrax toxin receptor-mediated drug development for blocking anthrax toxin action has received much attention in recent decades. In this study, we produced a secreted anthrax decoy fusion protein comprised of a portion of the human capillary morphogenesis gene-2 (CMG2) protein fused via a linker to the fragment crystallizable (Fc) domain of human immunoglobulin G1 in Nicotiana benthamiana plants using a transient expression system. Using the Cauliflower Mosaic Virus (CaMV) 35S promoter and co-expression with the p19 gene silencing suppressor, we were able to achieve a high level of recombinant CMG2-Fc-Apo (rCMG2-Fc-Apo) protein accumulation...
January 4, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28050954/comparison-of-two-sperm-processing-techniques-for-low-complexity-assisted-fertilization-sperm-washing-followed-by-swim-up-and-discontinuous-density-gradient-centrifugation
#7
Cássio L Fácio, Lígia F Previato, Ligiane A Machado-Paula, Paulo Cs Matheus, Edilberto Araújo
OBJECTIVE: This study aimed to assess and compare sperm motility, concentration, and morphology recovery rates, before and after processing through sperm washing followed by swim-up or discontinuous density gradient centrifugation in normospermic individuals. METHODS: Fifty-eight semen samples were used in double intrauterine insemination procedures; 17 samples (group 1) were prepared with sperm washing followed by swim-up, and 41 (group 2) by discontinuous density gradient centrifugation...
December 1, 2016: JBRA Assisted Reproduction
https://www.readbyqxmd.com/read/28027450/enabling-1536-well-high-throughput-cell-based-screening-through-the-application-of-novel-centrifugal-plate-washing
#8
Sinead Knight, Helen Plant, Lisa McWilliams, David Murray, Rebecca Dixon-Steele, Anet Varghese, Paul Harper, Anna Ramne, Paula McArdle, Susanna Engberg, Neil Bennett, Carolyn Blackett, Mark Wigglesworth
Cell-based assays have long been important within hit discovery paradigms; however, improving the disease relevance of the assay system can positively affect the translation of small-molecule drug discovery, especially if adopted in the initial hit identification assay. Consequently, there is an increasing need for disease-relevant assay systems capable of running at large scale, including the use of induced pluripotent stem cells and donor-derived primary cells. Major hurdles to adopting these assays for high-throughput screening are the cost, availability of cells, and complex protocols...
December 1, 2016: Journal of Biomolecular Screening
https://www.readbyqxmd.com/read/28012128/death-of-a-seven-month-old-child-in-a-washing-machine-a-case-report
#9
Antonio Osculati, Silvia Damiana Visonà, Laura Re, Marta Sozzi, Francesca Castelli, Luisa Andrello, Claudia Vignali
The authors present a case which brings out a unique modality of child homicide by placing the baby in a washing machine and turning it on. The murder was perpetrated by the baby's mother, who suffered from a serious depressive disorder. A postmortem RX and then a forensic autopsy were performed, followed by histologic examinations and toxicology. On the basis of the results of the autopsy, as well as the histology and the negative toxicological data, the cause of death was identified as acute asphyxia. This diagnosis was rendered in light of the absence of other causes of death, as well as the presence of typical signs of asphyxia, such as epicardial and pleural petechiae and, above all, the microscopic examinations, which pointed out a massive acute pulmonary emphysema...
December 24, 2016: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28000121/detection-of-bacillus-and-stenotrophomonas-species-growing-in-an-organic-acid-and-endocrine-disrupting-chemical-rich-environment-of-distillery-spent-wash-and-its-phytotoxicity
#10
Ram Chandra, Vineet Kumar
Sugarcane molasses-based distillery spent wash (DSW) is well known for its toxicity and complex mixture of various recalcitrant organic pollutants with acidic pH, but the chemical nature of these pollutants is unknown. This study revealed the presence of toxic organic acids (butanedioic acid bis(TMS)ester; 2-hydroxysocaproic acid; benzenepropanoic acid, α-[(TMS)oxy], TMS ester; vanillylpropionic acid, bis(TMS)), and other recalcitrant organic pollutants (2-furancarboxylic acid, 5-[[(TMS)oxy] methyl], TMS ester; benzoic acid 3-methoxy-4-[(TMS)oxy], TMS ester; and tricarballylic acid 3TMS), which are listed as endocrine-disrupting chemicals...
January 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27991634/interfacial-properties-and-emulsification-performance-of-thylakoid-membrane-fragments
#11
A Tamayo Tenorio, E W M de Jong, C V Nikiforidis, R M Boom, A J van der Goot
Thylakoids membranes are sophisticated, dynamic structures found in plant leaves, composed of protein complexes in a dynamic lipid matrix. The interfacial absorption dynamics and viscoelasticity of thylakoid membranes fragments were measured to assess the properties of the interfacial layer and to elucidate an emulsifying mechanism that includes the role of thylakoid's composition and 3D structure. Thylakoid membranes were extracted from sugar beet leaves by a series of buffer washing, filtration and centrifugation...
January 18, 2017: Soft Matter
https://www.readbyqxmd.com/read/27981009/guidable-thermophoretic-janus-micromotors-containing-gold-nanocolorifiers-for-infrared-laser-assisted-tissue-welding
#12
Wenping He, Johannes Frueh, Narisu Hu, Liping Liu, Meiyu Gai, Qiang He
Current wound sealing systems such as nanoparticle-based gluing of tissues allow almost immediate wound sealing. The assistance of a laser beam allows the wound sealing with higher controllability due to the collagen fiber melting which is defined by loss of tertiary protein structure and restoration upon cooling. Usually one employs dyes to paint onto the wound, if water absorption bands are absent. In case of strong bleeding or internal wounds such applications are not feasible due to low welding depth in case of water absorption bands, dyes washing off, or the dyes becoming diluted within the wound...
December 2016: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/27981006/enabling-the-triplet-of-tetraphenylethene-to-sensitize-the-excited-state-of-europium-iii-for-protein-detection-and-time-resolved-luminescence-imaging
#13
Zece Zhu, Bo Song, Jingli Yuan, Chuluo Yang
A tetraphenylethene (TPE) group that exhibits aggregation-induced emission is incorporated into the ligand of a Eu(III) complex (TPEEu) to sensitize the excited state of Eu(III). In steady-state measurements, TPEEu exhibits weak luminescence when dissolved in aqueous solutions even at a high concentration level, but emits strong fluorescence of TPE and phosphorescence of Eu(III) upon binding with bovine serum albumin. With a delay time of 0.05 ms and a gate time of 1.0 ms in time-resolved measurements, only phosphorescent emission of Eu(III) is observed with a high on/off ratio...
December 2016: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/27966367/novel-sio2-h2ti2o5%C3%A2-h2o-nanochain-composite-with-high-uv-visible-photocatalytic-activity-for-supertransparent-multifunctional-thin-films
#14
Lin Yao, Junhui He, Tong Li, Tingting Ren
In the current work, a peroxo titanium complex (PTC) solution was used as a novel water-soluble precursor to fabricate H2Ti2O5·H2O and the SiO2/H2Ti2O5·H2O-nanochain composite at low temperature (90-100 °C). The average width of H2Ti2O5·H2O nanochains is 4.5 ± 1.5 nm. Under full-spectrum irradiation, the Si/Ti-nanochain composite showed good UV-visible light absorption and excellent photocatalytic activity, which is 2.8 times that of P25. In the composite, SiO2 not only contributes to the formation of nanochains and improves the catalytic performance of H2Ti2O5·H2O but also reduces the refractive index of the complex...
December 27, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27966173/development-of-a-magnetic-microbead-affinity-selection-screen-magmass-using-mass-spectrometry-for-ligands-to-the-retinoid-x-receptor-%C3%AE
#15
Michael D Rush, Elisabeth M Walker, Gerd Prehna, Tristesse Burton, Richard B van Breemen
To overcome limiting factors in mass spectrometry-based screening methods such as automation while still facilitating the screening of complex mixtures such as botanical extracts, magnetic microbead affinity selection screening (MagMASS) was developed. The screening process involves immobilization of a target protein on a magnetic microbead using a variety of possible chemistries, incubation with mixtures of molecules containing possible ligands, a washing step that removes non-bound compounds while a magnetic field retains the beads in the microtiter well, and an organic solvent release step followed by LC-MS analysis...
December 13, 2016: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/27956221/ethylene-glycol-and-glycerol-loading-and-unloading-in-porcine-meniscal-tissue
#16
Talal A Takroni, Hana Yu, Leila Laouar, Adetola B Adesida, Janet A W Elliott, Nadr M Jomha
The development of a long-term storage method for meniscus, a complex tissue of the knee prone to injury, would improve the procedure and outcomes of meniscus transplantation. Cryopreservation uses cryoprotective agents (CPAs) including ethylene glycol (EG) and glycerol to preserve a variety of live tissues, and understanding of the CPA permeation kinetics will be critical in designing a vitrification protocol for meniscus. The purpose of this preliminary study was to understand the loading and unloading behaviours of EG and glycerol in meniscus by observing their efflux...
December 9, 2016: Cryobiology
https://www.readbyqxmd.com/read/27955895/modeling-on-column-reduction-of-trisulfide-bonds-in-monoclonal-antibodies-during-protein-a-chromatography
#17
Sanchayita Ghose, Rupshika Rajshekaran, Marisa Labanca, Lynn Conley
Trisulfides can be a common post-translational modification in many recombinant monoclonal antibodies. These are a source of product heterogeneity that add to the complexity of product characterization and hence, need to be reduced for consistent product quality. Trisulfide bonds can be converted to the regular disulfide bonds by incorporating a novel cysteine wash step during Protein A affinity chromatography. An empirical model is developed for this on-column reduction reaction to compare the reaction rates as a function of typical operating parameters such as temperature, cysteine concentration, reaction time and starting level of trisulfides...
January 6, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27940545/dynamics-of-viral-distribution-in-a-defined-swine-production-network-using-enteric-viruses-as-molecular-markers
#18
Virginie Lachapelle, Ann Letellier, Philippe Fravalo, Julie Brassard, Yvan L'Homme
: Modern swine production systems represent complex and dynamic networks involving numerous stakeholders. For instance, livestock transporters carry live animals between fattening sites, abattoirs and other premises on a daily basis. This interconnected system may increase the risk of microbial spread within and between networks although little information is available in that regard. In the present study, a swine network composed of ten finishing farms, one abattoir and three types of stakeholders (veterinarians, livestock transporters, nutritional technicians) in Quebec, Canada was selected to investigate specific vectors and reservoirs of enteric viruses...
December 9, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27936304/continuous-flow-synthesis-and-purification-of-aryldiazomethanes-through-hydrazone-fragmentation
#19
Éric Lévesque, Simon T Laporte, André B Charette
Electron-rich diazo compounds, such as aryldiazomethanes, are powerful reagents for the synthesis of complex structures, but the risks associated with their toxicity and instability often limit their use. Flow chemistry techniques make these issues avoidable, as the hazardous intermediate can be used as it is produced, avoiding accumulation and handling. Unfortunately, the produced stream is often contaminated with other reagents and by-products, making it incompatible with many applications, especially in catalysis...
December 9, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27934124/detection-of-moisture-by-fluorescent-off-on-sensor-in-organic-solvents-and-raw-food-products
#20
Pawan Kumar, Rahul Kaushik, Amrita Ghosh, D Amilan Jose
Copper complex based on a new class of fluorescence OFF-ON sensor 1.Cu has been reported for the detection of trace amounts of water in various organic solvents such as CH3OH, THF, CH3CN, and acetone by means of fluorescence emission intensity. The probe is highly responsive to water in THF (DL = 0.003 wt %). The dissociation of copper from probe 1.Cu in the presence of water is responsible for the fluorescence change and it was confirmed by electrospray ionization-mass spectrometry (ESI-MS), proton nuclear magnetic resonance ((1)H-NMR), and fluorescence lifetime studies...
December 6, 2016: Analytical Chemistry
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