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https://www.readbyqxmd.com/read/28231508/regulating-dynamic-signaling-between-hematopoietic-stem-cells-and-niche-cells-via-a-hydrogel-matrix
#1
Bhushan P Mahadik, Narayanan A K Bharadwaj, Randy H Ewoldt, Brendan A C Harley
Hematopoietic stem cells (HSC) reside in unique bone marrow niches and are influenced by signals from surrounding cells, the extracellular matrix (ECM), ECM-bound or diffusible biomolecules. Here we describe the use of a three-dimensional hydrogel to alter the balance of HSC-generated autocrine feedback and paracrine signals generated by co-cultured niche-associated cells. We report shifts in HSC proliferation rate and fate specification in the presence of lineage positive (Lin(+)) niche cells. Hydrogels promoting autocrine feedback enhanced expansion of early hematopoietic progenitors while paracrine signals from Lin(+) cells increased myeloid differentiation...
February 14, 2017: Biomaterials
https://www.readbyqxmd.com/read/28231486/coded-excitation-waveform-engineering-for-high-frame-rate-synthetic-aperture-ultrasound-imaging
#2
Bahman Lashkari, Kaicheng Zhang, Edem Dovlo, Andreas Mandelis
Coded excitation was initially introduced to ultrasound imaging as a method for enhancing the signal-to-noise ratio (SNR). However, this method was also shown to be helpful in conjunction with synthetic aperture transmission for high frame rate imaging. Recently, we introduced two families of mismatched coded excitations based on frequency modulation chirp and combined frequency modulation and Golay code. Here "mismatched" indicates that the coded excitations generate very small cross-correlations among themselves while each has a very strong autocorrelation...
February 12, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28231455/synthetic-investigation-physicochemical-characterization-and-antibacterial-evaluation-of-ternary-bi-iii-systems-with-hydroxycarboxylic-acid-and-aromatic-chelator-substrates
#3
C M Nday, E Halevas, A Tsiaprazi-Stamou, D Eleftheriadou, A Hatzidimitriou, G Jackson, D Reid, A Salifoglou
Due to its physical and chemical properties, bismuth (Bi(III)) is widely used in the treatment of several gastrointestinal and skin diseases, and infections caused by bacteria. Herein, its known antimicrobial potential was taken into consideration in the synthesis of two new hybrid ternary materials of Bi(III) with the physiological α-hydroxycarboxylic glycolic acid and 1,10-phenanthroline (phen), [Bi2(C2H2O3)2(C2H3O3)(NO3)]n(.) nH2O (1) and [Bi(C12H8N2)(NO3)4](C10H8N4) (2), aiming at improving its antibacterial properties...
February 11, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28231449/synthetic-gene-circuits-learn-to-classify
#4
Andriy Didovyk, Lev S Tsimring
An efficient computational algorithm is developed to design microRNA-based synthetic cell classifiers and to optimize their performance.
February 22, 2017: Cell Systems
https://www.readbyqxmd.com/read/28231432/dismantling-the-red-wall-of-colloidal-perovskites-highly-luminescent-formamidinium-and-formamidinium-cesium-lead-iodide-nanocrystals
#5
Loredana Protesescu, Sergii Yakunin, Sudhir Kumar, Janine Bär, Federica Bertolotti, Norberto Masciocchi, Antonietta Guagliardi, Matthias Grotevent, Ivan Shorubalko, Maryna I Bodnarchuk, Chih-Jen Shih, Maksym V Kovalenko
Colloidal nanocrystals (NCs) of APbX3-type lead halide perovskites [A=Cs+, CH3NH3+ (methylammonium or MA+) or CH(NH2)2+ (formamidinium or FA+); X=Cl-, Br-, I-] have recently emerged as highly versatile photonic sources for applications ranging from simple photoluminescence down-conversion (e.g., for display backlighting) to light emitting diodes. From the perspective of spectral coverage, a formidable challenge facing the use of these materials is how to obtain stable emissions in the red and infrared spectral regions covered by the iodide-based compositions...
February 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28231341/identification-of-the-er-resident-e3-ubiquitin-ligase-rnf145-as-a-novel-lxr-regulated-gene
#6
Emma C L Cook, Jessica K Nelson, Vincenzo Sorrentino, Duco Koenis, Martina Moeton, Saskia Scheij, Roelof Ottenhoff, Boris Bleijlevens, Anke Loregger, Noam Zelcer
Cellular cholesterol metabolism is subject to tight regulation to maintain adequate levels of this central lipid molecule. Herein, the sterol-responsive Liver X Receptors (LXRs) play an important role owing to their ability to reduce cellular cholesterol load. In this context, identifying the full set of LXR-regulated genes will contribute to our understanding of their role in cholesterol metabolism. Using global transcriptional analysis we report here the identification of RNF145 as an LXR-regulated target gene...
2017: PloS One
https://www.readbyqxmd.com/read/28231123/antibacterial-and-antioxidant-activities-of-essential-oils-from-artemisia-herba-alba-asso-pelargonium-capitatum-%C3%A3-radens-and-laurus-nobilis-l
#7
Ragina Rafiq, Saeed A Hayek, Ugochukwu Anyanwu, Bonita I Hardy, Valerie L Giddings, Salam A Ibrahim, Reza Tahergorabi, Hye Won Kang
Essential oils are natural antimicrobials that have the potential to provide a safer alternative to synthetic antimicrobials currently used in the food industry. Therefore, the aim of this study was to evaluate the antimicrobial and antioxidant activities of essential oils from white wormwood, rose-scented geranium and bay laurel against Salmonella typhimurium and Escherichia coli O157:H7 on fresh produce and to examine consumer acceptability of fresh produce treated with these essential oils. Our results showed that essential oil derived from rose-scented geranium exhibited the most effective antimicrobial activity at the same and similar minimum inhibition concentration levels (0...
April 11, 2016: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28231042/cost-effectiveness-analysis-of-four-simulated-colorectal-cancer-screening-interventions-north-carolina
#8
Kristen Hassmiller Lich, David A Cornejo, Maria E Mayorga, Michael Pignone, Florence K L Tangka, Lisa C Richardson, Tzy-Mey Kuo, Anne-Marie Meyer, Ingrid J Hall, Judith Lee Smith, Todd A Durham, Steven A Chall, Trisha M Crutchfield, Stephanie B Wheeler
INTRODUCTION: Colorectal cancer (CRC) screening rates are suboptimal, particularly among the uninsured and the under-insured and among rural and African American populations. Little guidance is available for state-level decision makers to use to prioritize investment in evidence-based interventions to improve their population's health. The objective of this study was to demonstrate use of a simulation model that incorporates synthetic census data and claims-based statistical models to project screening behavior in North Carolina...
February 23, 2017: Preventing Chronic Disease
https://www.readbyqxmd.com/read/28231008/palladium-catalyzed-%C3%AE-arylation-of-cyclic-vinylogous-esters-for-the-synthesis-of-%C3%AE-arylcyclohexenones-and-total-synthesis-of-aromatic-podocarpane-diterpenoids
#9
Wen-Yi Hou, Yen-Ku Wu
Described is a method for the formal γ-arylation of cyclohexenones allowing synthesis of a remote all-carbon quaternary center. The process involves the palladium-catalyzed α-arylation of a α-substituted cyclic vinylogous ester followed by the Stork-Danheiser transposition. The synthetic utility of this protocol is featured in the total syntheses of (±)-12-hydroxy-13-methylpodocarpa-8,11,13-trien-3-one, (±)-3β,12-dihydroxy-13-methylpodocarpane-8,11,13-triene, and (±)-O-methyl nimbinone.
February 23, 2017: Organic Letters
https://www.readbyqxmd.com/read/28230998/influence-of-the-anomeric-conformation-in-the-intermolecular-interactions-of-glucose
#10
Imanol Usabiaga, Jorge González, Iker León, Pedro Felipe Arnaiz, Emilio J Cocinero, Jose A Fernandez
Carbohydrates are together with amino acids, DNA bases and lipids the building blocks of living beings. They play a central role in basic functions as immunity and signaling, which are governed by non-covalent interactions between sugar units and/or with other biomolecules. To get insights on such interactions between monosaccharide units, we used a combination of mass-resolved laser spectroscopy in supersonic expansions and molecular structure calculations. The results obtained clearly demonstrate that the small stability difference between the α/β anomers of glucopyranose derivatives is reversed and amplified during molecular aggregation, making the complexes of the β-anomers significantly more stable...
February 23, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28230973/unique-opto-electronic-structure-and-photo-reduction-properties-of-sulfur-doped-lead-chromates-explaining-their-instability-in-paintings
#11
Vanousheh Rahemi, Nasrin Sarmadian, Willemien Anaf, Koen Janssens, Dirk Lamoen, Bart Partoens, Karolien De Wael
Chrome yellow refers to a group of synthetic inorganic pigments that became popular as an artist's material from the second quarter of the 19th century. The color of the pigment, in which the chromate ion acts as a chromophore, is related to its chemical composition (PbCr1-xSxO4, with 0≤x≤0.8) and crystalline structure (monoclinic/orthorhombic). Their shades range from the yellow-orange to the paler yellow tones with increasing sulfate amount. These pigments show remarkable signs of degradation after limited time periods...
February 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28230971/multifaceted-gold-palladium-bimetallic-nanorods-and-their-geometric-compositional-and-catalytic-tunabilities
#12
Lichao Sun, Qingfeng Zhang, Guangfang Grace Li, Esteban Villarreal, Xiaoqi Fu, Hui Wang
Kinetically controlled, seed-mediated coreduction provides a robust and versatile synthetic approach to multimetallic nanoparticles with precisely controlled geometries and compositions. Here we demonstrate that single-crystalline cylindrical Au nanorods selectively transform into a series of structurally distinct Au@Au-Pd alloy core-shell bimetallic nanorods with exotic multifaceted geometries enclosed by specific types of facets upon seed-mediated Au-Pd coreduction under diffusion controlled conditions. By adjusting several key synthetic parameters, such as the Pd/Au precursor ratio, the reducing agent concentration, the capping surfactant concentration, and foreign metal ion additives, we have been able to simultaneously fine-tailor the atomic-level surface structures and fine-tune the compositional stoichiometries of the multifaceted Au-Pd bimetallic nanorods...
February 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28230878/multifunctional-hybrid-porous-filters-with-hierarchical-structures-for-simultaneous-removal-of-indoor-vocs-dusts-and-microorganisms
#13
Yang Zhao, Ze-Xian Low, Shasha Feng, Zhaoxiang Zhong, Yong Wang, Zhong Yao
Air purification often requires multiple layers of filters with different functions to remove various air pollutants, which lead to high pressure drop, high air flow path and frequent filter replacement. In this work, a novel multifunctional Ag@MWCNTs/Al2O3 hybrid filter with a depth-type hierarchical structure for simultaneous removal of fine particles, microorganisms and VOCs was designed and fabricated. The novel hybrid air filter showed leading air purification performances to date, achieving 82.24% degradation of formaldehyde at room temperature, 99...
February 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28230853/mesenchymal-stromal-cells-inhibit-cd25-expression-via-the-mtor-pathway-to-potentiate-t-cell-suppression
#14
Hyun Seung Yoo, Kyuheon Lee, Kwangmin Na, Yong Xu Zhang, Hyun-Ja Lim, TacGhee Yi, Sun U Song, Myung-Shin Jeon
Mesenchymal stromal cells (MSCs) are known to suppress T-cell activation and proliferation. Several studies have reported that MSCs suppress CD25 expression in T cells. However, the molecular mechanism underlying MSC-mediated suppression of CD25 expression has not been fully examined. Here, we investigated the mTOR pathway, which is involved in CD25 expression in T cells. We showed that MSCs inhibited CD25 expression, which was restored in the presence of an inducible nitric oxide synthase (iNOS) inhibitor...
February 23, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28230850/metal-and-additive-free-photoinduced-borylation-of-haloarenes
#15
Adelphe M Mfuh, Brett D Schneider, Westley Cruces, Oleg V Larionov
Boronic acids and esters have critical roles in the areas of synthetic organic chemistry, molecular sensors, materials science, drug discovery, and catalysis. Many of the current applications of boronic acids and esters require materials with very low levels of transition metal contamination. Most of the current methods for the synthesis of boronic acids, however, require transition metal catalysts and ligands that must be removed via additional purification procedures. This protocol describes a simple, metal- and additive-free method of conversion of haloarenes directly to boronic acids and esters...
March 2017: Nature Protocols
https://www.readbyqxmd.com/read/28230803/one-pot-conversion-of-epoxidized-soybean-oil-eso-into-soy-based-polyurethanes-by-mocl%C3%A2-o%C3%A2-catalysis
#16
Vincenzo Pantone, Cosimo Annese, Caterina Fusco, Paola Fini, Angelo Nacci, Antonella Russo, Lucia D'Accolti
An innovative and eco-friendly one-pot synthesis of bio-based polyurethanes is proposed via the epoxy-ring opening of epoxidized soybean oil (ESO) with methanol, followed by the reaction of methoxy bio-polyols intermediates with 2,6-tolyl-diisocyanate (TDI). Both synthetic steps, methanolysis and polyurethane linkage formation, are promoted by a unique catalyst, molybdenum(VI) dichloride dioxide (MoCl₂O₂), which makes this procedure an efficient, cost-effective, and environmentally safer method amenable to industrial scale-up...
February 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28230790/influence-of-chitosan-swelling-behaviour-on-controlled-release-of-tenofovir-from-mucoadhesive-vaginal-systems-for-prevention-of-sexual-transmission-of-hiv
#17
Fernando Notario-Pérez, Araceli Martín-Illana, Raúl Cazorla-Luna, Roberto Ruiz-Caro, Luis-Miguel Bedoya, Aitana Tamayo, Juan Rubio, María-Dolores Veiga
The main challenges facing efforts to prevent the transmission of human immunodeficiency virus (HIV) are the lack of access to sexual education services and sexual violence against young women and girls. Vaginal formulations for the prevention of sexually transmitted infections are currently gaining importance in drug development. Vaginal mucoadhesive tablets can be developed by including natural polymers that have good binding capacity with mucosal tissues, such as chitosan or guar gum, semisynthetic polymers such as hydroxypropylmethyl cellulose, or synthetic polymers such as Eudragit(®) RS...
February 21, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28230597/histomorphometric-evaluation-of-two-different-bone-substitutes-in-sinus-floor-augmentation-procedures
#18
Marco Portelli, Marco Cicciù, Floriana Lauritano, Gabriele Cervino, Maurizio Manuelli, Enrico Felice Gherlone, Alessandra Lucchese
The aim of this study is to compare the histomorphometric data of deproteinized bovine bone (DBB) and a fully synthetic bone substitute, poly (lactic-co-glycolic) acid/hydroxyapatite (PLGA/HA) applied for sinus floor augmentation technique. Twelve maxillary atrophic ridges of 8 patients requiring major maxillary sinus floor augmentation were studied; the sites were randomly assigned to the study groups and reexamined at 6 months after grafting using cone beam computed tomography scans and biopsy samples harvested during dental implant placement...
February 22, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28230378/catalytic-asymmetric-chlorocyclization-of-2-vinylphenylcarbamates-for-synthesis-of-1-4-dihydro-2h-3-1-benzoxazin-2-one-derivatives
#19
Yan-Min Yu, Ya-Nan Huang, Jun Deng
A facile synthetic approach to a series of chiral 4-chloromethyl-1,4-dihydro-2H-3,1-benzoxazin-2-one derivatives has been described. This transformation is achieved through the catalytic asymmetric chlorocyclization of 2-vinylphenylcarbamates using a newly developed organocatalyst. Furthermore, the resulting products can be easily converted into diverse bioactive agents.
February 23, 2017: Organic Letters
https://www.readbyqxmd.com/read/28230372/formal-asymmetric-%C3%AE-alkenylation-of-aldehydes-and-the-synthetic-application-toward-forming-%C3%AE-exo-methylene-%C3%AE-butyrolactones-and-skipped-dienes
#20
Yang Li, Lise Ibsen, Karl Anker Jørgensen
A formal asymmetric α-alkenylation of aldehydes is reported based on the organocatalytic reaction of aldehydes with nitroacrylates. The reaction proceeds in a one-pot manner forming the products with up to 77% yield and up to >99% ee. This strategy is also successfully applied for the synthesis of α-exo-methylene-γ-butyrolactones and skipped diene scaffolds in a highly enantioselective manner.
February 23, 2017: Organic Letters
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