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https://www.readbyqxmd.com/read/29677692/full-color-emitting-fluorescent-carbon-material-as-reversible-ph-sensor-with-multicolor-live-cell-imaging
#1
Vinay Sharma, Navpreet Kaur, Pranav Tiwari, Shaikh M Mobin
Carbon-based nano materials are developed as a cytocompatible alternative to semiconducting quantum dots for bioimaging and fluorescence-based sensing. The green alternatives for the synthesis of carbon materials are imminent. The present study demonstrates microwave based one step quick synthesis of fluorescent carbon material (FCM) having three variants: (i) un-doped fluorescent carbon material (UFCM) (ii) nitrogen doped FCM (N@FCM), and (iii) nitrogen & phosphorus co-doped FCM (N-P@FCM) using sugarcane extract as a carbon source...
April 11, 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29677683/application-of-solid-phase-microextraction-followed-by-liquid-chromatography-mass-spectrometry-in-the-determination-of-antibiotic-drugs-and-their-metabolites-in-human-whole-blood-and-tissue-samples
#2
Malgorzata Szultka-Mlynska, Pawel Pomastowski, Boguslaw Buszewski
A sensitive, rapid and specific analytical method using high performance liquid chromatography coupled with mass spectrometry (HPLC-QqQ-MS) was developed to determine selected antibiotic drugs and their metabolites (amoxicillin, cefotaxime, ciprofloxacin, clindamycin and metronidazole; amoxycilloic acid, 4-hydroxyphenyl glycyl amoxicillin, desacetyl cefotaxime, 3-desacetyl cefotaxime lactone, ciprofloxacin N-oxide, N-demethylclindamycin, clindamycin sulfoxide, and hydroxy metronidazole) in human whole blood and vascularized tissue after single oral administration...
April 12, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29677679/a-four-parameter-optimization-and-troubleshooting-of-a-rplc-charged-aerosol-detection-stability-indicating-method-for-determination-of-s-lysophosphatidylcholines-in-a-phospholipid-formulation
#3
James Tam, Imad A Haidar Ahmad, Andrei Blasko
A four parameter optimization of a stability indicating method for non-chromophoric degradation products of 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC), 1-stearoyl-sn-glycero-3-phosphocholine and 2-stearoyl-sn-glycero-3-phosphocholine was achieved using a reverse phase liquid chromatography-charged aerosol detection (RPLC-CAD) technique. Using the hydrophobic subtraction model of selectivity, a core-shell, polar embedded RPLC column was selected followed by gradient-temperature optimization, resulting in ideal relative peak placements for a robust, stability indicating separation...
April 7, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29677618/altered-serum-levels-of-vascular-endothelial-growth-factor-in-first-episode-drug-na%C3%A3-ve-and-chronic-medicated-schizophrenia
#4
Fei Ye, Qiongqiong Zhan, Wenhuan Xiao, Xiaowei Tang, Jin Li, Hui Dong, Weiwei Sha, Xiaobin Zhang
There is much evidence of a relationship between alterations in the brain's regional cellular energy metabolism and blood flow in schizophrenic. Vascular endothelial growth factor (VEGF) plays a role in the pathogenesis of neuropsychiatric illnesses. So, we compared serum VEGF levels in drug-naïve first-episode psychotic (FEP) and chronically medicated schizophrenic to examine if a correlation existed between VEGF and psychopathological symptoms. The serum VEGF levels were assessed in 46 FEP patients, 47 chronic medicated patients and 50 healthy controls...
April 11, 2018: Psychiatry Research
https://www.readbyqxmd.com/read/29677567/methods-for-assessing-mitochondrial-quality-control-mechanisms-and-cellular-consequences-in-cell-culture
#5
Matthew Redmann, Gloria A Benavides, Willayat Yousuf Wani, Taylor F Berryhill, Xiaosen Ouyang, Michelle S Johnson, Saranya Ravi, Kasturi Mitra, Stephen Barnes, Victor M Darley-Usmar, Jianhua Zhang
Mitochondrial quality is under surveillance by autophagy, the cell recycling process which degrades and removes damaged mitochondria. Inadequate autophagy results in deterioration in mitochondrial quality, bioenergetic dysfunction, and metabolic stress. Here we describe in an integrated work-flow to assess parameters of mitochondrial morphology, function, mtDNA and protein damage, metabolism and autophagy regulation to provide the framework for a practical assessment of mitochondrial quality. This protocol has been tested with cell cultures, is highly reproducible, and is adaptable to studies when cell numbers are limited, and thus will be of interest to researchers studying diverse physiological and pathological phenomena in which decreased mitochondrial quality is a contributory factor...
April 10, 2018: Redox Biology
https://www.readbyqxmd.com/read/29677555/matrix-architecture-plays-a-pivotal-role-in-3d-osteoblast-migration-the-effect-of-interstitial-fluid-flow
#6
Cristina Del Amo, Vanesa Olivares, Mar Cóndor, Alejandro Blanco, Jorge Santolaria, Jesús Asín, Carlos Borau, José Manuel García-Aznar
Osteoblast migration is a crucial process in bone regeneration, which is strongly regulated by interstitial fluid flow. However, the exact role that such flow exerts on osteoblast migration is still unclear. To deepen the understanding of this phenomenon, we cultured human osteoblasts on 3D microfluidic devices under different fluid flow regimes. Our results show that a slow fluid flow rate by itself is not able to alter the 3D migratory patterns of osteoblasts in collagen-based gels but that at higher fluid flow rates (increased flow velocity) may indirectly influence cell movement by altering the collagen microstructure...
April 10, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29677546/bacitracin-promotes-osteogenic-differentiation-of-human-bone-marrow-mesenchymal-stem-cells-by-stimulating-the-bone-morphogenetic-protein-2-smad-axis
#7
Hui Li, Bin'en Nie, Zhe Du, Shutao Zhang, Teng Long, Bing Yue
Bacitracin, a widely used metallopeptide antibiotic, has been reported to be locally used in treating wounds without systemic adverse reactions. Our preliminary study showed that bacitracin might enhance the osteogenic differentiation of human bone marrow mesenchymal stem cells (HBMSCs). The present study investigated whether bacitracin affects the osteogenic differentiation of HBMSCs and the molecular mechanisms involved. The proliferation of HBMSCs in the presence of bacitracin was examined using a cell counting kit-8 (CCK-8) assay...
April 17, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29677517/gpr68-senses-flow-and-is-essential-for-vascular-physiology
#8
Jie Xu, Jayanti Mathur, Emilie Vessières, Scott Hammack, Keiko Nonomura, Julie Favre, Linda Grimaud, Matt Petrus, Allain Francisco, Jingyuan Li, Van Lee, Fu-Li Xiang, James K Mainquist, Stuart M Cahalan, Anthony P Orth, John R Walker, Shang Ma, Viktor Lukacs, Laura Bordone, Michael Bandell, Bryan Laffitte, Yan Xu, Shu Chien, Daniel Henrion, Ardem Patapoutian
Mechanotransduction plays a crucial role in vascular biology. One example of this is the local regulation of vascular resistance via flow-mediated dilation (FMD). Impairment of this process is a hallmark of endothelial dysfunction and a precursor to a wide array of vascular diseases, such as hypertension and atherosclerosis. Yet the molecules responsible for sensing flow (shear stress) within endothelial cells remain largely unknown. We designed a 384-well screening system that applies shear stress on cultured cells...
April 19, 2018: Cell
https://www.readbyqxmd.com/read/29677505/a-mechanosensitive-gpcr-that-detects-the-bloody-force
#9
Adam J Iliff, X Z Shawn Xu
Mechanoreceptors mediate a wide variety of physiological processes, such as hearing, touch, proprioception, and blood flow regulation. It is generally believed that mechanoreceptors are force-gated ion channels. Now, Xu et al. uncover a GPCR that is activated by shear force in endothelial cells of blood vessels.
April 19, 2018: Cell
https://www.readbyqxmd.com/read/29677457/improved-protocol-for-simultaneous-analysis-of-leukocyte-subsets-and-epithelial-cells-from-murine-and-human-lung
#10
Christine Happle, Lena Meyer-Decking, Anika Dreier, Martin Wetzke, Stephanie Gläsener, Ruth Grychtol, Peter Braubach, Alexandra Jablonka, Sibylle Haid, Adan Chari Jirmo, Anika Habener, Jelena Skuljec, Gesine Hansen
PURPOSE: To study and isolate lung cells by flow cytometry, enzymatic digestion and generation of single cell suspensions is required. This significantly influences expression of cellular epitopes and protocols need to be adapted for the best isolation and subsequent analysis of specific cellular subsets. MATERIALS AND METHODS: We optimized protocols for the simultaneous isolation and characterization of specific human and murine lung cell types. For alveolar epithelial cells (AEC), a primarily dispase based digestion method and for leukocytes, a primarily collagenase based technique was adapted...
April 20, 2018: Experimental Lung Research
https://www.readbyqxmd.com/read/29677448/self-assembled-ph-responsive-polymeric-micelles-for-highly-efficient-non-cytotoxic-delivery-of-doxorubicin-chemotherapy-to-inhibit-macrophage-activation-in-vitro-investigation
#11
Zhi-Sheng Liao, Shan-You Huang, Jyun-Jie Huang, Jem-Kun Chen, Ai-Wei Lee, Juin-Yih Lai, Duu-Jong Lee, Chih-Chia Cheng
Self-assembled pH-responsive polymeric micelles, a combination of hydrophilic poly(ethylene glycol) segments and hydrogen bonding interactions within a biocompatible polyurethane substrate, can spontaneously self-assemble into highly controlled, nanosized micelles in aqueous solution. These newly-developed micelles exhibit excellent pH-responsive behavior and biocompatibility, highly controlled drug (doxorubicin; DOX) release behavior and high drug encapsulation stability in different aqueous environments, making the micelles highly attractive potential candidates for safer, more effective drug delivery in applications such as cancer chemotherapy...
April 20, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29677376/endothelial-protein-c-targeting-liposomes-show-enhanced-uptake-and-improved-therapeutic-efficacy-in-human-retinal-endothelial-cells
#12
Anthoula Arta, Anne Z Eriksen, Fredrik Melander, Paul Kempen, Michael Larsen, Thomas L Andresen, Andrew J Urquhart
Purpose: To determine whether human retinal endothelial cells (HRECs) express the endothelial cell protein C receptor (EPCR) and to realize its potential as a targeting moiety by developing novel single and dual corticosteroid-loaded functionalized liposomes that exhibit both enhanced uptake by HRECs and superior biologic activity compared to nontargeting liposomes and free drug. Methods: EPCR expression of HRECs was investigated through flow cytometry and Western blot assays...
April 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29677369/targeted-drug-delivery-in-the-suprachoroidal-space-by-swollen-hydrogel-pushing
#13
Jae Hwan Jung, Patcharin Desit, Mark R Prausnitz
Purpose: The purpose is to target model drug particles to the posterior region of the suprachoroidal space (SCS) of the eye controlled via pushing by hydrogel swelling. Methods: A particle formulation containing 1% hyaluronic acid (HA) with fluorescent polymer particles and a hydrogel formulation containing 4% HA were introduced in a single syringe as two layers without mixing, and injected sequentially into the SCS of the rabbit eye ex vivo and in vivo using a microneedle...
April 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29677368/in-vivo-characterization-of-spontaneous-retinal-neovascularization-in-the-mouse-eye-by-multifunctional-optical-coherence-tomography
#14
Marco Augustin, Matthias Wechdorn, Ulrike Pfeiffenberger, Tanja Himmel, Stanislava Fialová, René M Werkmeister, Christoph K Hitzenberger, Martin Glösmann, Bernhard Baumann
Purpose: To investigate the early development of spontaneous retinal neovascularization in the murine retina by a multifunctional optical coherence tomography approach. To characterize involved tissue changes in vivo and describe structural and functional changes over time. Methods: A multifunctional optical coherence tomography (OCT) system providing 3-fold contrast comprising reflectivity, polarization sensitivity, and OCT angiography (OCTA) was utilized to image very-low-density lipoprotein receptor (VLDLR) knockout mice...
April 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29677356/volume-rendered-projection-resolved-oct-angiography-3d-lesion-complexity-is-associated-with-therapy-response-in-wet-age-related-macular-degeneration
#15
Peter L Nesper, Brian T Soetikno, Alison D Treister, Amani A Fawzi
Purpose: To explore whether quantitative three-dimensional (3D) analysis of choroidal neovascularization (CNV) using projection-resolved optical coherence tomography angiography (PR-OCTA) is associated with treatment response in neovascular age-related macular degeneration (nAMD). Methods: Retrospective, cross-sectional study of 51 eyes of 49 patients undergoing individualized anti-VEGF therapy for nAMD. Patients were classified as "good" or "poor" responders, requiring injections at less or more frequently than 6-week intervals, respectively...
April 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29677351/retinal-oxygen-delivery-and-metabolism-in-healthy-and-sickle-cell-retinopathy-subjects
#16
Mahnaz Shahidi, Anthony E Felder, Ou Tan, Norman P Blair, David Huang
Purpose: Reduction in inner retinal oxygen delivery (DO2) can cause retinal hypoxia and impair inner retinal oxygen metabolism (MO2), leading to vision loss. The purpose of the current study was to establish measurements of DO2 and MO2 in healthy subjects and test the hypothesis that DO2 and MO2 are reduced in sickle cell retinopathy (SCR) subjects. Methods: Dual wavelength retinal oximetry and Doppler optical coherence tomography were performed in 12 healthy control and 12 SCR subjects...
April 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29677215/tracking-the-fate-of-adoptively-transferred-myeloid-derived-suppressor-cells-in-the-primary-breast-tumor-microenvironment
#17
Jaclyn Sceneay, Christoph M Griessinger, Sabrina H L Hoffmann, Shu Wen Wen, Christina S F Wong, Sophie Krumeich, Manfred Kneilling, Bernd J Pichler, Andreas Möller
Myeloid-derived suppressor cells (MDSCs) are a heterogeneous population of immature myeloid progenitor cells that are expanded in cancer and act as potent suppressors of the anti-tumor immune response. MDSCs consist of two major subsets, namely monocytic (M-) MDSCs and granulocytic (G-) MDSCs that differ with respect to their phenotype, morphology and mechanisms of suppression. Here, we cultured bone marrow cells with IL-6 and GM-CSF in vitro to generate a population of bone marrow MDSCs (BM-MDSCs) similar to G-MDSCs from tumor-bearing mice in regards to phenotype, morphology and suppressive-function...
2018: PloS One
https://www.readbyqxmd.com/read/29677212/pulsatile-operation-of-a-continuous-flow-right-ventricular-assist-device-rvad-to-improve-vascular-pulsatility
#18
Boon C Ng, Matthias Kleinheyer, Peter A Smith, Daniel Timms, William E Cohn, Einly Lim
Despite the widespread acceptance of rotary blood pump (RBP) in clinical use over the past decades, the diminished flow pulsatility generated by a fixed speed RBP has been regarded as a potential factor that may lead to adverse events such as vasculature stiffening and hemorrhagic strokes. In this study, we investigate the feasibility of generating physiological pulse pressure in the pulmonary circulation by modulating the speed of a right ventricular assist device (RVAD) in a mock circulation loop. A rectangular pulse profile with predetermined pulse width has been implemented as the pump speed pattern with two different phase shifts (0% and 50%) with respect to the ventricular contraction...
2018: PloS One
https://www.readbyqxmd.com/read/29677201/an-incremental-clustering-method-based-on-the-boundary-profile
#19
Junpeng Bao, Wenqing Wang, Tianshe Yang, Guan Wu
Many important applications continuously generate data, such as financial transaction administration, satellite monitoring, network flow monitoring, and web information processing. The data mining results are always evolving with the newly generated data. Obviously, for the clustering task, it is better to incrementally update the new clustering results based on the old data rather than to recluster all of the data from scratch. The incremental clustering approach is an essential way to solve the problem of clustering with growing Big Data...
2018: PloS One
https://www.readbyqxmd.com/read/29677152/optimization-of-the-critical-parameters-of-the-spherical-agglomeration-crystallization-method-by-the-application-of-the-quality-by-design-approach
#20
Orsolya Gyulai, Anita Kovács, Tamás Sovány, Ildikó Csóka, Zoltán Aigner
This research work presents the use of the Quality by Design (QbD) concept for optimization of the spherical agglomeration crystallization method in the case of the active agent, ambroxol hydrochloride (AMB HCl). AMB HCl spherical crystals were formulated by the spherical agglomeration method, which was applied as an antisolvent technique. Spherical crystals have good flowing properties, which makes the direct compression tableting method applicable. This means that the amount of additives used can be reduced and smaller tablets can be formed...
April 20, 2018: Materials
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