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https://www.readbyqxmd.com/read/28079208/controlled-assembly-of-single-colloidal-crystals-using-electro-osmotic-micro-pumps
#1
Ran Niu, Erdal C Oğuz, Hannah Müller, Alexander Reinmüller, Denis Botin, Hartmut Löwen, Thomas Palberg
We assemble charged colloidal spheres at deliberately chosen locations on a charged unstructured glass substrate utilizing ion exchange based electro-osmotic micro-pumps. Using microscopy, a simple scaling theory and Brownian dynamics computer simulations, we systematically explore the control parameters of crystal assembly and the mechanisms through which they depend on the experimental boundary conditions. We demonstrate that crystal quality depends crucially on the assembly distance of the colloids. This is understood as resulting from the competition between inward transport by the electro-osmotic pump flow and the electro-phoretic outward motion of the colloids...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28074088/accurate-optimization-of-amino-acid-form-factors-for-computing-small-angle-x-ray-scattering-intensity-of-atomistic-protein-structures
#2
Dudu Tong, Sichun Yang, Lanyuan Lu
Structure modelling via small-angle X-ray scattering (SAXS) data generally requires intensive computations of scattering intensity from any given biomolecular structure, where the accurate evaluation of SAXS profiles using coarse-grained (CG) methods is vital to improve computational efficiency. To date, most CG SAXS computing methods have been based on a single-bead-per-residue approximation but have neglected structural correlations between amino acids. To improve the accuracy of scattering calculations, accurate CG form factors of amino acids are now derived using a rigorous optimization strategy, termed electron-density matching (EDM), to best fit electron-density distributions of protein structures...
August 1, 2016: Journal of Applied Crystallography
https://www.readbyqxmd.com/read/28073648/elevated-neutrophil-elastase-in-tears-of-ocular-graft-versus-host-disease-patients
#3
Samer N Arafat, Marie-Claude Robert, Tulio Abud, Sandra Spurr-Michaud, Francisco Amparo, Claes H Dohlman, Reza Dana, Ilene K Gipson
PURPOSE: To investigate the levels of neutrophil elastase (NE), matrix metalloproteinases (MMPs) and myeloperoxidase (MPO) in tear washes of patients with ocular graft-versus-host disease (oGVHD). DESIGN: Case-control study. METHODS: Based on established criteria, oGVHD patients (n = 14; 28 eyes) and age/sex-matched healthy controls (n = 14; 28 eyes) were enrolled. Tear washes were collected and analyzed for NE using a single-analyte enzyme-linked immunosorbent assay (ELISA)...
January 7, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28073029/multiplexed-efficient-on-chip-sample-preparation-and-sensitive-amplification-free-detection-of-ebola-virus
#4
K Du, H Cai, M Park, T A Wall, M A Stott, K J Alfson, A Griffiths, R Carrion, J L Patterson, A R Hawkins, H Schmidt, R A Mathies
An automated microfluidic sample preparation multiplexer (SPM) has been developed and evaluated for Ebola virus detection. Metered air bubbles controlled by microvalves are used to improve bead-solution mixing thereby enhancing the hybridization of the target Ebola virus RNA with capture probes bound to the beads. The method uses thermally stable 4-formyl benzamide functionalized (4FB) magnetic beads rather than streptavidin coated beads with a high density of capture probes to improve the target capture efficiency...
January 3, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28066995/molecular-galactose-galectin-association-in-neuroblastoma-cells-an-unconventional-tool-for-qualitative-quantitative-screening
#5
Fabio Pastorino, Mirco Ponzoni, Giuseppina Simone
Galectin decorates the cell membrane and forms an extracellular molecular association with galactoside units. Here, galactoside probes have been used to study galectin expression in neuroblastoma cells. The hypothesis behind this investigation has been that the molecular mechanisms by which glycans modulate neural metastatic cells involve a protein-carbohydrate association, galectin-galactose. Preliminary screening to validate the hypothesis has been performed with galactose moieties anchored to beads. The molecular association has been studied by FACS...
January 9, 2017: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/28064476/chemoselective-coupling-preserves-the-substrate-integrity-of-surface-immobilized-oligonucleotides-for-emulsion-pcr-based-gene-library-construction
#6
Marie L Malone, Valerie J Cavett, Brian M Paegel
Combinatorial bead libraries figure prominently in next-generation sequencing and are also important tools for in vitro evolution. The most common methodology for generating such bead libraries, emulsion PCR (emPCR), enzymatically extends bead-immobilized oligonucleotide PCR primers in emulsion droplets containing a single progenitor library member. Primers are almost always immobilized on beads via noncovalent biotin-streptavidin binding. Here, we describe covalent bead functionalization with primers (∼10(6) primers/2...
January 9, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28054089/separation-and-dual-detection-of-prostate-cancer-cells-and-protein-biomarkers-using-a-microchip-device
#7
Wanfeng Huang, Chun-Li Chang, Norman D Brault, Onur Gur, Zhe Wang, Shadia I Jalal, Philip S Low, Timothy L Ratliff, Roberto Pili, Cagri A Savran
Current efforts for the detection of prostate cancer using only prostate specific antigen are not ideal and indicate a need to develop new assays - using multiple targets - that can more accurately stratify disease states. We previously introduced a device capable of the concurrent detection of cellular and molecular markers from a single sample fluid. Here, an improved design, which achieves affinity as well as size-based separation of captured targets using antibody-conjugated magnetic beads and a silicon chip containing micro-apertures, is presented...
January 5, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28052260/telomere-recognition-and-assembly-mechanism-of-mammalian-shelterin
#8
Fabian Erdel, Katja Kratz, Smaranda Willcox, Jack D Griffith, Eric C Greene, Titia de Lange
Shelterin is a six-subunit protein complex that plays crucial roles in telomere length regulation, protection, and maintenance. Although several shelterin subunits have been studied in vitro, the biochemical properties of the fully assembled shelterin complex are not well defined. Here, we characterize shelterin using ensemble biochemical methods, electron microscopy, and single-molecule imaging to determine how shelterin recognizes and assembles onto telomeric repeats. We show that shelterin complexes can exist in solution and primarily locate telomeric DNA through a three-dimensional diffusive search...
January 3, 2017: Cell Reports
https://www.readbyqxmd.com/read/28046494/su-c-209-07-phantoms-for-digital-breast-tomosynthesis-imaging-system-evaluation
#9
D Jacobson, Y Liu
PURPOSE: Digital Breast Tomosynthesis (DBT) is gaining importance in breast imaging. There is a need for phantoms that can be used for image evaluation and comparison. Existing commercially available phantoms for DBT are expensive and may lack clinically relevant test objects. The purpose of this study is to develop phantoms for DBT evaluation. METHODS: Four phantoms have been designed and constructed to assess the image quality (IQ) of two DBT systems. The first contains a spiral of 0...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28045875/conformational-variants-of-hla-i-antigens-on-luminex-single-antigen-beads-for-monitoring-antibodies
#10
Mepur H Ravindranath, Vadim Jucaud
No abstract text is available yet for this article.
December 31, 2016: Transplantation
https://www.readbyqxmd.com/read/28039295/third-generation-cd28-4-1bb-chimeric-antigen-receptor-t-cells-for-chemotherapy-relapsed-or-refractory-acute-lymphoblastic-leukaemia-a-non-randomised-open-label-phase-i-trial-protocol
#11
Xiao-Yi Tang, Yao Sun, Ang Zhang, Guo-Liang Hu, Wei Cao, Dan-Hong Wang, Bin Zhang, Hu Chen
INTRODUCTION: There is no curative treatment available for patients with chemotherapy relapsed or refractory CD19+ B cells-derived acute lymphoblastic leukaemia (r/r B-ALL). Although CD19-targeting second-generation (2nd-G) chimeric antigen receptor (CAR)-modified T cells carrying CD28 or 4-1BB domains have demonstrated potency in patients with advanced B-ALL, these 2 signalling domains endow CAR-T cells with different and complementary functional properties. Preclinical results have shown that third-generation (3rd-G) CAR-T cells combining 4-1BB and CD28 signalling domains have superior activation and proliferation capacity compared with 2nd-G CAR-T cells carrying CD28 domain...
December 30, 2016: BMJ Open
https://www.readbyqxmd.com/read/28035320/clinical-significance-of-early-changes-in%C3%A2-circulating-tumor-cells-from-patients-receiving-first-line-cisplatin-based-chemotherapy-for-metastatic-urothelial-carcinoma
#12
Emanuela Fina, Andrea Necchi, Patrizia Giannatempo, Maurizio Colecchia, Daniele Raggi, Maria Grazia Daidone, Vera Cappelletti
Background: The therapeutic paradigm of metastatic urothelial carcinoma (UC) is rapidly shifting and new biomarkers are needed to enhance patient selection. Objective: Early identification of dynamic predictors of outcome may be a key to optimize the sequence of effective therapies in metastatic UC patients. Methods: Blood samples from patients receiving first-line MVAC chemotherapy were collected at baseline (T0) and after 2 cycles (T2). Samples were processed by immunomagnetic beads (AdnaTest ProstateCancerSelect kit) and the expression of EPCAM, MUC1 and ERBB2 was studied using multiplex-PCR...
October 27, 2016: Bladder Cancer
https://www.readbyqxmd.com/read/28026784/kilohertz-bandwidth-dual-stage-haptic-device-lets-you-touch-brownian-motion
#13
Tianming Lu, Cecile Pacoret, David Heriban, Abdenbi Mohand-Ousaid, Stephane Regnier, Vincent Hayward
This paper describes a haptic interface that has a uniform response over the entire human tactile frequency range. Structural mechanics makes it very difficult to implement articulated mechanical systems that can transmit high frequency signals. Here, we separated the frequency range into two frequency bands. The lower band is within the first structural mode of the corresponding haptic device while the higher one can be transmitted accurately by a fast actuator operating from conservation of momentum, that is, without reaction forces to the ground...
December 23, 2016: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28024888/optimization-of-magnetic-retention-in-the-gastrointestinal-tract-enhanced-bioavailability-of-poorly-permeable-drug
#14
Anjali Seth, David Lafargue, Cécile Poirier, Thomas Badier, Nathalie Delory, Alain Laporte, Jean-Marie Delbos, Véronique Jeannin, Jean-Manuel Péan, Christine Ménager
Oral administration of low permeable drugs remains a challenge as they do not cross biological membrane efficiently and therefore exhibit a poor bioavailability. Herein, the effect of magnetic retention on the circulation and bioavailability of magnetic beads in the gastrointestinal tract in the presence of an external magnetic field is evaluated. Retention efficiency is imaged using magnetic resonance and near infrared techniques. The effect on bioavailability is then evaluated in a pharmacokinetic study. Iron oxide nanoparticles, the drug (dipeptidyl peptidase-IV inhibitor) and a fluorophore (Alexa Fluor-750) are co-encapsulated in chitosan-alginate core-shell beads...
December 23, 2016: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28018733/light-sheet-based-2d-light-scattering-cytometry-for-label-free-characterization-of-senescent-cells
#15
Meiai Lin, Xu Qiao, Qiao Liu, Changshun Shao, Xuantao Su
A light-sheet-based 2D light scattering cytometer is developed for label-free characterization of senescent cells. The light-sheet provides an illumination beam with controlled thickness for single cell excitation, and 2D light scattering patterns are obtained by using a defocused imaging method. The principle of this cytometer is validated by distinguishing microspheres with submicron resolution. Automatic classification of senescent and normal cells is achieved at single cell level by using the support vector machine (SVM) algorithm, where a sensitivity of 89...
December 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/28017569/a-targeted-high-throughput-next-generation-sequencing-panel-for-clinical-screening-of-mutations-gene-amplifications-and-fusions-in-solid-tumors
#16
Rajyalakshmi Luthra, Keyur P Patel, Mark J Routbort, Russell R Broaddus, Jonathan Yau, Crystal Simien, Wei Chen, David Z Hatfield, L Jeffrey Medeiros, Rajesh R Singh
Clinical next-generation sequencing (NGS) assay choice requires careful consideration of panel size, inclusion of appropriate markers, ability to detect multiple genomic aberration types, compatibility with low quality and quantity of nucleic acids, and work flow feasibility. Herein, in a high-volume clinical molecular diagnostic laboratory, we have validated a targeted high-multiplex PCR-based NGS panel (OncoMine Comprehensive Assay) coupled with high-throughput sequencing using Ion Proton sequencer for routine screening of solid tumors...
December 22, 2016: Journal of Molecular Diagnostics: JMD
https://www.readbyqxmd.com/read/28009780/kidney-transplant-with-low-levels-of-dsa-or-low-positive-b-flow-crossmatch-an-underappreciated-option-for-highly-sensitized-transplant-candidates
#17
Carrie Schinstock, Manish Gandhi, Wisit Cheungpasitporn, Donald Mitema, Mikel Prieto, Patrick Dean, Lynn Cornell, Fernando Cosio, Mark Stegall
BACKGROUND: Avoiding donor specific antibody (DSA) is difficult for sensitized patients. Improved understanding of the risk of low level DSA is needed. METHODS: We retrospectively compared the outcomes of 954 patients transplanted with varied levels of baseline DSA detected by single antigen beads and B flow cytometric crossmatch (XM). Patients were grouped as follows: -DSA/-XM, +DSA/-XM, +DSA/low+XM, +DSA/high+XM, and -DSA/+XM and followed for a mean of 4.1±1...
December 22, 2016: Transplantation
https://www.readbyqxmd.com/read/28008970/high-resolution-spectroscopy-reveals-fibrillation-inhibition-pathways-of-insulin
#18
Tanja Deckert-Gaudig, Volker Deckert
Fibril formation implies the conversion of a protein's native secondary structure and is associated with several neurodegenerative diseases. A better understanding of fibrillation inhibition and fibril dissection requires nanoscale molecular characterization of amyloid structures involved. Tip-enhanced Raman scattering (TERS) has already been used to chemically analyze amyloid fibrils on a sub-protein unit basis. Here, TERS in combination with atomic force microscopy (AFM), and conventional Raman spectroscopy characterizes insulin assemblies generated during inhibition and dissection experiments in the presence of benzonitrile, dimethylsulfoxide, quercetin, and β-carotene...
December 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28004743/a-new-formulation-of-bacillus-thuringiensis-uv-protection-and-sustained-release-mosquito-larvae-studies
#19
Lingling Zhang, Xiaojuan Zhang, Yi Zhang, Songqin Wu, Ivan Gelbič, Lei Xu, Xiong Guan
Persistence of Bacillus thuringiensis is an important factor in determining the success of this product as a pest control agent. In this report we present the development of a highly active mosquitocidal formulation with high resistance to UV. LLP29-M19 strain of Bt, selected by repeated exposure to UV was found to be highly resistant to UV. The product was optimized and the methods used were statistically analyzed. Using single-factor experiments it was determined that the optimal concentration of sodium alginate, CaCl2 and hollow glass beads in the formulation were 1...
December 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28003971/optic-neuropathy-and-increased-retinal-glial-fibrillary-acidic-protein-due-to-microbead-induced-ocular-hypertension-in-the-rabbit
#20
Jun Zhao, Tian-Hui Zhu, Wen-Chieh Chen, Shi-Ming Peng, Xiao-Sheng Huang, Kin-Sang Cho, Dong Feng Chen, Guei-Sheung Liu
AIM: To characterize whether a glaucoma model with chronic elevation of the intraocular pressure (IOP) was able to be induced by anterior chamber injection of microbeads in rabbits. METHODS: In order to screen the optimal dose of microbead injection, IOP was measured every 3d for 4wk using handheld applanation tonometer after a single intracameral injection of 10 µL, 25 µL, 50 µL or 100 µL microbeads (5×10(6) beads/mL; n=6/group) in New Zealand White rabbits...
2016: International Journal of Ophthalmology
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