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https://www.readbyqxmd.com/read/28110446/fabrication-and-optical-properties-of-strain-free-self-assembled-mesoscopic-gaas-structures
#1
Saimon Filipe Covre da Silva, Thayná Mardegan, Sidnei Ramis de Araújo, Carlos Alberto Ospina Ramirez, Suwit Kiravittaya, Odilon D D Couto, Fernando Iikawa, Christoph Deneke
We use a combined process of Ga-assisted deoxidation and local droplet etching to fabricate unstrained mesoscopic GaAs/AlGaAs structures exhibiting a high shape anisotropy with a length up to 1.2 μm and a width of 150 nm. We demonstrate good controllability over size and morphology of the mesoscopic structures by tuning the growth parameters. Our growth method yields structures, which are coupled to a surrounding quantum well and present unique optical emission features. Microscopic and optical analysis of single structures allows us to demonstrate that single structure emission originates from two different confinement regions, which are spectrally separated and show sharp excitonic lines...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28110383/risk-factors-for-recurrence-after-acute-colonic-diverticulitis-a-systematic-review
#2
REVIEW
Line Hupfeld, Jakob Burcharth, Hans-Christian Pommergaard, Jacob Rosenberg
PURPOSE: Several factors may influence the risk of recurrence after an episode of acute colonic diverticulitis. Until now, a comprehensive systematic overview and evaluation of relevant risk factors have not been presented. This review aimed at assembling and evaluating current evidence on risk factors for recurrence after conservatively treated acute colonic diverticulitis. METHODS: PubMed, Embase, and Cochrane databases were searched for studies evaluating risk factors for recurrence after acute diverticulitis treated non-surgically defined as antibiotic treatment, percutaneous abscess drainage, or by observation...
January 22, 2017: International Journal of Colorectal Disease
https://www.readbyqxmd.com/read/28110271/diversity-without-limits-new-insights-from-the-most-comprehensive-tree-of-prokaryotic-life-assembled-to-date
#3
Joseph Caspermeyer
No abstract text is available yet for this article.
January 21, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28110249/design-an-aptasensor-based-on-structure-switching-aptamer-on-dendritic-gold-nanostructures-fe3o4-sio2-dabco-modified-screen-printed-electrode-for-highly-selective-detection-of-epirubicin
#4
Ayemeh Bagheri Hashkavayi, Jahan Bakhsh Raoof
The present work describes a label free electrochemical aptasensor for selective detection of epirubicin. In this project, 5'-thiole terminated aptamer was self-assembled on carbon screen printed electrode, which modified with electrodeposited gold nanoparticles on magnetic double-charged diazoniabicyclo [2.2.2] octane dichloride silica hybrid (Fe3O4@SiO2/DABCO) by Au-S bond. The interactions of epirubicin with aptamer on the AuNPs/Fe3O4@SiO2/DABCO/SPE have been studied by cyclic voltammetry, linear sweep voltammetry and electrochemical impedance spectroscopy...
January 14, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28110229/aerobic-granular-sludge-inoculated-microbial-fuel-cells-for-enhanced-epoxy-reactive-diluent-wastewater-treatment
#5
Kai Cheng, Jingping Hu, Huijie Hou, Bingchuan Liu, Qin Chen, Keliang Pan, Wenhong Pu, Jiakuan Yang, Xu Wu, Changzhu Yang
Microbial consortiums aggregated on the anode surface of microbial fuel cells (MFCs) are critical factors for electricity generation as well as biodegradation efficiencies of organic compounds. Here in this study, aerobic granular sludge (AGS) was assembled on the surface of the MFC anode to form an AGS-MFC system with superior performance on epoxy reactive diluent (ERD) wastewater treatment. AGS-MFCs successfully shortened the startup time from 13d to 7d compared to the ones inoculated with domestic wastewater...
January 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28110227/efficient-removal-of-nitrobenzene-and-concomitant-electricity-production-by-single-chamber-microbial-fuel-cells-with-activated-carbon-air-cathode
#6
Enren Zhang, Feng Wang, Wenjing Zhai, Keith Scott, Xu Wang, Guowang Diao
Single-chamber microbial fuel cells (S-MFCs) with bio-anodes and activated carbon (AC) air-cathodes showed high nitrobenzene (NB) tolerance and NB removal with concomitant electricity production. The maximum power over 25Wm(-3) could be obtained when S-MFCs were operated in the NB loading range of 1.2-6.2molm(-3)d(-1), and stable electricity production over 13.7Wm(-3) could be produced in a NB loading range of 1.2-14.7molm(-3)d(-1). The present S-MFCs exhibited high NB removal performance with NB removal efficiency over 97% even when the NB loading rate was increased to 17...
January 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28110170/tailoring-polymeric-hybrid-micelles-with-lymph-node-targeting-ability-to-improve-the-potency-of-cancer-vaccines
#7
Qin Zeng, Hanmei Li, Hao Jiang, Jiao Yu, Ying Wang, Huan Ke, Tao Gong, Zhirong Zhang, Xun Sun
It has been widely accepted that lymph nodes (LNs) are critical targets of cancer vaccines and particles sized between 10 and 100 nm with a neutral or negative surface charge are preferred for lymphatic transfer after subcutaneous or intradermal injection. However their limited uptake by antigen presenting cells (APCs) and inadequate retention within LNs undoubtedly restrains their strength on activating T cell immunity. Here, we address this issue by tailoring the physicochemical properties of polymeric hybrid micelles (HMs), which are self-assembled from two amphiphilic diblock copolymers, poly-(ethylene glycol) phosphorethanolamine (PEG-PE) and polyethylenimine-stearic acid conjugate (PSA) via hydrophobic and electrostatic interactions...
January 11, 2017: Biomaterials
https://www.readbyqxmd.com/read/28110100/transport-of-outer-membrane-lipids-in-mycobacteria
#8
REVIEW
Megan H Touchette, Jessica C Seeliger
The complex organization of the mycobacterial cell wall poses unique challenges for the study of its assembly. Although mycobacteria are classified evolutionarily as Gram-positive bacteria, their cell wall architecture more closely resembles that of Gram-negative organisms. They possess not only an inner cytoplasmic membrane, but also a bilayer outer membrane that encloses an aqueous periplasm and includes diverse lipids that are required for the survival and virulence of pathogenic species. Questions surrounding how mycobacterial outer membrane lipids are transported from where they are made in the cytoplasm to where they function at the cell exterior are thus similar, and similarly compelling, to those that have driven the study of Gram-negative outer membrane transport pathways...
January 18, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28110086/different-mechanisms-in-learning-different-second-languages-evidence-from-english-speakers-learning-chinese-and-spanish
#9
Fan Cao, Bethany L Sussman, Valeria Rios, Xin Yan, Zhao Wang, Gregory J Spray, Ryan M Mack
Word reading has been found to be associated with different neural networks in different languages, with greater involvement of the lexical pathway for opaque languages and greater invovlement of the sub-lexical pathway for transparent langauges. However, we do not know whether this language divergence can be demonstrated in second langauge learners, how learner's metalinguistic ability would modulate the langauge divergence, or whether learning method would interact with the language divergence. In this study, we attempted to answer these questions by comparing brain activations of Chinese and Spanish word reading in native English-speaking adults who learned Chinese and Spanish over a 2 week period under three learning conditions: phonological, handwriting, and passive viewing...
January 18, 2017: NeuroImage
https://www.readbyqxmd.com/read/28110069/peptide-and-nucleic-acid-directed-self-assembly-of-cationic-nanovehicles-through-giant-unilamellar-vesicle-modification-targetable-nanocomplexes-for-in-vivo-nucleic-acid-delivery
#10
A D Tagalakis, R Maeshima, C Yu-Wai-Man, J Meng, F Syed, L-P Wu, A M Aldossary, D McCarthy, S M Moghimi, S L Hart
: One of the greatest challenges for the development of genetic therapies is the efficient targeted delivery of therapeutic nucleic acids. Towards this goal, we have introduced a new engineering initiative in self-assembly of biologically safe and stable nanovesicle complexes (∼90-140 nm) derived from giant unilamellar vesicle (GUV) precursors and comprising plasmid DNA or siRNA and targeting peptide ligands. The biological performance of the engineered nanovesicle complexes were studied both in vitro and in vivo and compared with cationic liposome-based lipopolyplexes...
January 18, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28110042/recent-advances-in-compartmentalized-synthetic-architectures-as-drug-carriers-cell-mimics-and-artificial-organelles
#11
REVIEW
M J York-Duran, M Godoy-Gallardo, C Labay, A J Urquhart, T L Andresen, L Hosta-Rigau
Compartmentalization is a key feature of biological cells which conduct their metabolic activity in individual steps isolated in distinct, separated compartments. The creation of architectures containing multiple compartments with a structure that resembles that of a biological cell has generated significant research attention and these assemblies are proposed as candidate materials for a range of biomedical applications. In this Review article, the recent successes of multicompartment architectures as carriers for the delivery of therapeutic cargo or the creation of micro- and nanoreactors that mimic metabolic activities, thus acting as artificial cells or organelles, are discussed...
January 16, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28110034/transcriptome-profiles-of-the-clam-meretrix-petechialis-hepatopancreas-in-response-to-vibrio-infection
#12
Fengjuan Jiang, Xin Yue, Hongxia Wang, Baozhong Liu
Microbial diseases have received much attention due to their enormous destruction of aquaculture, and Vibrio parahaemolyticus is one of the main pathogens that cause bacterial disease in the clam Meretrix petechialis. To better understand the molecular mechanisms of the immune response to Vibrio in M. petechialis, RNA-Seq was applied to explore global expression changes of hepatopancreas from this clam after Vibrio challenge. There were 199,318,966 clean reads obtained by Illumina sequencing, which were further assembled into 214,577 transcripts, and then 147,255 unigenes with an N50 of 1393 bp were identified...
January 18, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28110014/nanosilver-as-a-disinfectant-in-dental-unit-waterlines-assessment-of-the-physicochemical-transformations-of-the-agnps
#13
Alireza Gitipour, Souhail R Al-Abed, Stephen W Thiel, Kirk G Scheckel, Thabet Tolaymat
Dental unit water lines (DUWL) are susceptible to biofilm development and bacterial growth leading to water contamination, causing health and ecological effects. This study monitors the interactions between a commonly used nanosilver disinfectant (ASAP-AGX-32, an antimicrobial cleaner for dental units, 0.0032% Ag) and biofilm development in DUWL. To simulate the disinfection scenario, an in-house DUWL model was assembled and biofilm accumulation was allowed. Subsequent to biofilm development, the disinfection process was performed according to the manufacturer's instructions...
January 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28109951/a-cognitive-approach-for-design-of-a-multimedia-informed-consent-video-and-website-in-pediatric-research
#14
Holly Antal, H Timothy Bunnell, Suzanne M McCahan, Chris Pennington, Tim Wysocki, Kathryn Blake
OBJECTIVE: Poor participant comprehension of research procedures following the conventional face-to-face consent process for biomedical research is common. We describe the development of a multimedia informed consent video and website that incorporates cognitive strategies to enhance comprehension of study related material directed to parents and adolescents. MATERIALS AND METHODS: A multidisciplinary team was assembled for development of the video and website that included human subjects professionals; psychologist researchers; institutional video and web developers; bioinformaticians and programmers; and parent and adolescent stakeholders...
January 18, 2017: Journal of Biomedical Informatics
https://www.readbyqxmd.com/read/28109885/hetero-and-homodimerization-of-arabidopsis-thaliana-arginine-decarboxylase-atadc1-and-atadc2
#15
Israel Maruri-López, Juan F Jiménez-Bremont
The arginine decarboxylase enzyme (ADC) carries out the production of agmatine from arginine, which is the precursor of the first polyamine (PA) known as putrescine; subsequently, putrescine is turned into the higher PAs, spermidine and spermine. In Arabidopsis thaliana PA production occurs only from arginine and this step is initiated by two ADC paralogous, AtADC1 and AtADC2. PA production is essential for A. thaliana life cycle. Here, we analyzed the sub-cellular localization of AtADC1 and AtADC2 enzymes through GFP translational fusions...
January 18, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28109813/amyloid-like-aggregates-formation-by-blood-plasma-fibronectin
#16
Rümeyza Bascetin, Khadija Admane, Rémy Agniel, Thomas Boudou, Tristan Doussineau, Rodolphe Antoine, Olivier Gallet, Johanne Leroy-Dudal, Charlotte Vendrely
Fibronectin (FN) is a multifunctional glycoprotein of the extracellular matrix (ECM) playing critical roles in physiological and pathological cell processes like adhesion, migration, growth, and differentiation. These various functions of FN are modulated by its supramolecular state. Indeed, FN can polymerize into different types of assemblies like fibrils and aggregates. However, the mechanism of polymerization and the effects of such assemblies on cell behaviors still remain to be elucidated. Here we show that upon irreversible thermal denaturation, human blood plasma fibronectin forms high molecular weight aggregates...
January 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28109697/fibronectin-fibrils-regulate-tgf-%C3%AE-1-induced-epithelial-mesenchymal-transition
#17
Lauren A Griggs, Nadiah T Hassan, Roshni S Malik, Brian Griffin, Brittany A Martinez, Lynne W Elmore, Christopher A Lemmon
Epithelial-Mesenchymal Transition (EMT) is a dynamic process through which epithelial cells transdifferentiate from an epithelial phenotype into a mesenchymal phenotype. Previous studies have also demonstrated that both mechanical signaling and soluble growth factor signaling facilitate this process. One possible point of integration for mechanical and growth factor signaling is the extracellular matrix. Here we investigate the role of the extracellular matrix (ECM) protein fibronectin (FN) in this process...
January 18, 2017: Matrix Biology: Journal of the International Society for Matrix Biology
https://www.readbyqxmd.com/read/28109330/the-structure-of-mammalian-prions-and-their-aggregates
#18
E Vázquez-Fernández, H S Young, J R Requena, H Wille
Prion diseases, such as Creutzfeldt-Jakob disease in humans, bovine spongiform encephalopathy in cattle, chronic wasting disease in cervids (i.e., deer, elk, moose, and reindeer), and sheep scrapie, are caused by the misfolding of the cellular prion protein (PrP(C)) into a disease-causing conformer (PrP(Sc)). PrP(C) is a normal, GPI-anchored protein that is expressed on the surface of neurons and other cell types. The structure of PrP(C) is well understood, based on studies of recombinant PrP, which closely mimics the structure of native PrP(C)...
2017: International Review of Cell and Molecular Biology
https://www.readbyqxmd.com/read/28109326/from-the-evolution-of-protein-sequences-able-to-resist-self-assembly-to-the-prediction-of-aggregation-propensity
#19
F Bemporad, M Ramazzotti
Folding of polypeptide chains into biologically active entities is an astonishingly complex process, determined by the nature and the sequence of residues emerging from ribosomes. While it has been long believed that evolution has pressed genomes so that specific sequences could adopt unique, functional three-dimensional folds, it is now clear that complex protein machineries act as quality control system and supervise folding. Notwithstanding that, events such as erroneous folding, partial folding, or misfolding are frequent during the life of a cell or a whole organism, and they can escape controls...
2017: International Review of Cell and Molecular Biology
https://www.readbyqxmd.com/read/28108965/transcriptomic-and-hormone-analyses-reveal-mechanisms-underlying-petal-elongation-in-chrysanthemum-morifolium-jinba
#20
Jingjing Wang, Haibin Wang, Lian Ding, Aiping Song, Feng Shen, Jiafu Jiang, Sumei Chen, Fadi Chen
Auxin regulates chrysanthemum petal elongation by promoting cell elongation. Transcriptomic analysis shows that auxin signal transduction may connect with other transcription factors by TCPs to regulate chrysanthemum petal elongation. As an ornamental species, Chrysanthemum morifolium has high ornamental and economic value. Petal size is the primary factor that influences the ornamental value of chrysanthemum, but the mechanism underlying the development of C. morifolium petals remains unclear. In our study, we tracked the growth of petals and found that the basal region of 'Jinba' petals showed a higher elongation rate, exhibiting rapid cell elongation during petal growth...
January 20, 2017: Plant Molecular Biology
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