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https://www.readbyqxmd.com/read/29346726/the-effect-of-dielectric-environment-on-doping-efficiency-in-colloidal-pbse-nanostructures
#1
Qinghua Zhao, Tianshuo Zhao, Jiacen Guo, Wenxiang Chen, Mingliang Zhang, Cherie R Kagan
Doping, as a central strategy to control free carrier type and concentration in semiconductor materials, suffers from low efficiency at the nanoscale, especially in systems having high permittivity (ϵ) and large Bohr radii, such as lead chalcogenide nanocrystals (NCs) and nanowires (NWs). Here, we study dielectric confinement effects on the doping efficiency of lead chalcogenides nanostructures by integrating PbSe NWs in the platform of field effect transistors (FETs). Elemental Pb or In or elemental Se is deposited by thermal evaporation to remotely n- or p-dope the NWs...
January 18, 2018: ACS Nano
https://www.readbyqxmd.com/read/29346425/hippocampal-corticotropin-releasing-hormone-neurons-support-recognition-memory-and-modulate-hippocampal-excitability
#2
Andrew Hooper, Patrick M Fuller, Jamie Maguire
Corticotropin-releasing hormone (CRH) signaling in the hippocampus has been established to be important for mediating the effects of stress on learning and memory. Given our laboratory's recent characterization of a subset of hippocampal CRH neurons as a novel class of GABAergic interneurons, we hypothesized that these local GABAergic hippocampal CRH neurons may influence hippocampal function. Here we applied an array of molecular tools to selectively label and manipulate hippocampal CRH neurons in mice, in order to assess this interneuron population's impact on hippocampus-dependent behaviors and hippocampal network excitability...
2018: PloS One
https://www.readbyqxmd.com/read/29346416/decoding-the-network-of-trypanosoma-brucei-proteins-that-determines-sensitivity-to-apolipoprotein-l1
#3
Rachel B Currier, Anneli Cooper, Hollie Burrell-Saward, Annette MacLeod, Sam Alsford
In contrast to Trypanosoma brucei gambiense and T. b. rhodesiense (the causative agents of human African trypanosomiasis), T. b. brucei is lysed by apolipoprotein-L1 (apoL1)-containing human serum trypanolytic factors (TLF), rendering it non-infectious to humans. While the mechanisms of TLF1 uptake, apoL1 membrane integration, and T. b. gambiense and T. b. rhodesiense apoL1-resistance have been extensively characterised, our understanding of the range of factors that drive apoL1 action in T. b. brucei is limited...
January 18, 2018: PLoS Pathogens
https://www.readbyqxmd.com/read/29346349/early-treatment-of-siv-macaques-with-an-%C3%AE-4%C3%AE-7-mab-alters-virus-distribution-and-preserves-cd4-t-cells-in-later-stages-of-infection
#4
P J Santangelo, C Cicala, S N Byrareddy, K T Ortiz, D Little, K E Lindsay, S Gumber, J J Hong, K Jelicic, K A Rogers, C Zurla, F Villinger, A A Ansari, A S Fauci, J Arthos
Integrin α4β7 mediates the trafficking of leukocytes, including CD4+ T cells, to lymphoid tissues in the gut. Virus mediated damage to the gut is implicated in HIV and SIV mediated chronic immune activation and leads to irreversible damage to the immune system. We employed an immuno-PET/CT imaging technique to evaluate the impact of an anti-integrin α4β7 mAb alone or in combination with ART, on the distribution of both SIV infected cells and CD4+ cells in rhesus macaques infected with SIV. We determined that α4β7 mAb reduced viral antigen in an array of tissues of the lung, spleen, axillary, and inguinal lymph nodes...
December 20, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/29346330/formulation-of-poloxamers-for-drug-delivery
#5
REVIEW
Andrew M Bodratti, Paschalis Alexandridis
Poloxamers, also known as Pluronics®, are block copolymers of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO), which have an amphiphilic character and useful association and adsorption properties emanating from this. Poloxamers find use in many applications that require solubilization or stabilization of compounds and also have notable physiological properties, including low toxicity. Accordingly, poloxamers serve well as excipients for pharmaceuticals. Current challenges facing nanomedicine revolve around the transport of typically water-insoluble drugs throughout the body, followed by targeted delivery...
January 18, 2018: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/29346110/a-three-dimensional-arrayed-microfluidic-blood-brain-barrier-model-with-integrated-electrical-sensor-array
#6
Sehoon Jeong, Sunja Kim, John Buonocore, Jaewon Park, C Jane Welsh, Jianrong Li, Arum Han
OBJECTIVE: The blood-brain barrier (BBB) poses a unique challenge to the development of therapeutics against neurological disorders due to its impermeabi-lity to most of the chemical compounds. Most in vitro BBB models have limitations in mimicking in vivo conditions and functions. Here, we show a co-culture microfluidic BBB-on-a-chip that provides interactions between neurovascular endothelial cells and neuronal cells across a porous polycarbonate membrane, which better mimics the in vivo conditions, as well as allows in vivo level shear stress to be applied...
February 2018: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/29346103/wavedec-a-wavelet-approach-to-identify-both-shared-and-individual-patterns-of-copy-number-variations
#7
Hongmin Cai, Peihua Chen, Jiazhou Chen, Jiulun Cai, Yan Song, Guoqiang Han
Copy-number variations (CNVs) are associated with complex diseases and particular tumor types. Array-based comparative genomic hybridization (aCGH) is a common approach for the detection of CNVs. Traditional CNV detection methods for multiple aCGH samples mainly use batch samples to find common variations, not accounting for the individual characteristics of each sample. Accurately differentiating both the commonly shared and the individual CNV patterns is pivotal to identify cell populations, or to distinguish cell growth (as in cancer) from invasion of new cells...
February 2018: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/29346102/impedance-measures-during-in-vitro-cochlear-implantation-predict-array-positioning
#8
Christopher Kenneth Giardina, Elliot Samuel Krause, Kanthaiah Koka, Douglas Carl Fitzpatrick
OBJECTIVE: Improper electrode placement during cochlear implant (CI) insertion can adversely affect speech perception outcomes. However, the intraoperative methods to determine positioning are limited. Because measures of electrode impedance can be made quickly, the goal of this study was to assess the relationship between CI impedance and proximity to adjacent structures. METHODS: An Advanced Bionics CI array was inserted into a clear, plastic cochlea one electrode contact at a time in a saline bath (nine trials)...
February 2018: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/29346067/the-association-between-child-maltreatment-and-adult-poverty-a-systematic-review-of-longitudinal-research
#9
Lisa Bunting, Gavin Davidson, Claire McCartan, Jennifer Hanratty, Paul Bywaters, Will Mason, Nicole Steils
Child maltreatment is a global problem affecting millions of children and is associated with an array of cumulative negative outcomes later in life, including unemployment and financial difficulties. Although establishing child maltreatment as a causal mechanism for adult economic outcomes is fraught with difficulty, understanding the relationship between the two is essential to reducing such inequality. This paper presents findings from a systematic review of longitudinal research examining experiences of child maltreatment and economic outcomes in adulthood...
January 12, 2018: Child Abuse & Neglect
https://www.readbyqxmd.com/read/29346006/public-health-education-teaching-epidemiology-in-high-school-classrooms
#10
Emily D'Agostino
Epidemiology instruction has expanded at the undergraduate level in part because it increases student critical thinking and scientific literacy, promotes students' perception of public health as both practical and relevant, and empowers students as independent, lifelong learners. Why then are more high schools not adopting epidemiology as a course requirement for students? Although prior iterations of high school epidemiology courses are noteworthy for incorporating active and participatory learning, embedding them into existing and continually shifting curricula is challenging and time-consuming, especially for teachers not trained in the field...
January 18, 2018: American Journal of Public Health
https://www.readbyqxmd.com/read/29345987/habitable-worlds-delivering-on-the-promises-of-online-education
#11
Lev B Horodyskyj, Chris Mead, Zack Belinson, Sanlyn Buxner, Steven Semken, Ariel D Anbar
Critical thinking and scientific reasoning are central to higher education in the United States, but many courses (in-person and online) teach students information about science much more than they teach the actual process of science and its associated knowledge and skills. In the online arena specifically, the tools available for course construction exacerbate this problem by making it difficult to build the types of active learning activities that research shows to be the most effective. Here, we present a report on Habitable Worlds, offered by Arizona State University for 12 semesters over the past 6 years...
January 2018: Astrobiology
https://www.readbyqxmd.com/read/29345910/qualitative-and-quantitative-analysis-of-ethanolic-extract-and-phenolic-fraction-of-jatropha-aethiopica-euphorbiaceae-leaves-and-their-hypoglycemic-potential
#12
Daylin Gamiotea-Turro, Nathalia Aparecida de Paula Camaforte, Alexander Barbaro Valerino-Diaz, Yarelis Ortiz Nunez, Daniel Rinaldo, Anne Ligia Dokkedal, José Roberto Bosqueiro, Lourdes Campaner Dos Santos
While Jatropha aethiopica, popularly known in Cuba as "mata diabetes", is used in salads and as a dietary supplement, its chemical composition and antidiabetic properties yet remains unclear. In this work, we evaluate the qualitative and quantitative composition of ethanolic extract (EE) and phenolic fraction (PF) of Jatropha aethiopica, leaves and their hypoglycemic and hypolipidemic activity. Chemical fractionation of the ethanolic extract yielded nine compounds, which included protocatechuic acid (1), chlorogenic acid (2), caffeic acid (3), quercetin 3-O-α-L-rhamnopyranosyl-(1→2)-[α-L-rhamnopyranolsyl-(1→6)]-β-D-galactopyranoside (4), a new kaempferol 3-O-α-L-rhamnopyranosyl-(1→4)-[α-L-rhamnopyranolsyl-(1→6)]-β-D-galactopyranoside (5), kaempferol 3-O-α-L-rhamnopyranosyl-(1→2[α-L-rhamnopyranolsyl-(1→6)]-β-D-glucopyranoside (6), rutin (7), kaempferol 3-O-α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside (8) and quercetin (9)...
January 18, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29345701/effects-of-particle-size-and-annealing-on-plasmon-induced-charge-separation-at-self-assembled-gold-nanoparticle-arrays
#13
Kun-Che Kao, Hiroyasu Nishi, Tetsu Tatsuma
Two-dimensional periodic Au nanoparticle arrays were constructed on TiO2 thin films by a micelle lithography method and seed-mediated photoelectrochemical growth. Their adjustable interparticle distance allows investigation of a particle size effect on plasmon-induced charge separation (PICS) efficiencies without interference from particle aggregation or plasmon coupling. External or internal PICS efficiencies were found to increase and decrease, respectively, with an increase in particle diameter from 25 to 38 nm...
January 18, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29345343/mycobacterium-tuberculosis-rewiring-host-cell-signaling-to-promote-infection
#14
REVIEW
Michael D Stutz, Michelle P Clark, Marcel Doerflinger, Marc Pellegrini
The ability of Mycobacterium tuberculosis to cause disease hinges upon successfully thwarting the innate defenses of the macrophage host cell. The pathogen's trump card is its armory of virulence factors that throw normal host cell signaling into disarray. This process of subverting the macrophage begins upon entry into the cell, when M. tuberculosis actively inhibits the fusion of the bacilli-laden phagosomes with lysosomes. The pathogen then modulates an array of host signal transduction pathways, which dampens the macrophage's host-protective cytokine response, while simultaneously adapting host cell metabolism to stimulate lipid body accumulation...
December 15, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/29345335/heat-shock-protein-70-modulates-neural-progenitor-cells-dynamics-in-human-neuroblastoma-sh-sy5y-cells-exposed-to-high-glucose-content
#15
Leila Salimi, Reza Rahbarghazi, Vahab Jafarian, Çıgır Biray Avci, Bakiye Goker Bagca, Neslihan Pinar Ozates, Majid Khaksar, Alireza Nourazarian
BACKGROUND: In the current experiment, detrimental effects of high glucose condition were investigated on human neuroblastoma cells. METHODS: Human neuroblastoma cell line SH-SY5Y were exposed to 5, 40 and 70 mM glucose over a period of 72 h. Survival rate and the proliferation of cells were analyzed by MTT and BrdU incorporation assays. Apoptosis was studied by the assays of flow cytometry and PCR array. In order to investigate the trans-differentiation capacity of the cell into mature neurons, we used immunofluorescence imaging to follow NeuN protein level...
January 18, 2018: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29345253/3-acetyl-oleanolic-acid-ameliorates-non-alcoholic-fatty-liver-disease-in-high-fat-diet-treated-rats-by-activating-ampk-related-pathways
#16
Qiong Ou-Yang, Chun-Xiao Xuan, Xue Wang, Han-Qiong Luo, Jin-E Liu, Lan-Lan Wang, Ting-Ting Li, Yu-Peng Chen, Jun Liu
3-Acetyl-oleanolic acid (3Ac-OA) is a derivative of oleanolic acid (OA), which has shown therapeutic beneficial effects on diabetes and metabolic syndrome. In this study we investigated whether 3Ac-OA exerted beneficial effect on non-alcoholic fatty liver disease (NAFLD) in rats and its potential underlying mechanisms. Treatment with 3Ac-OA (1-100 μmol/L) dose-dependently decreased the intracellular levels of total cholesterol (TC) and triglyceride (TG) in FFA-treated primary rat hepatocytes and human HepG2 cell lines in vitro...
January 18, 2018: Acta Pharmacologica Sinica
https://www.readbyqxmd.com/read/29345197/neonatal-hyperoxia-depletes-pulmonary-vein-cardiomyocytes-in-adult-mice-via-mitochondrial-oxidation
#17
Min Yee, Ethan David Cohen, William Domm, George A Porter, Andrew N McDavid, Michael A O'Reilly
Supplemental oxygen given to preterm infants has been associated with permanently altering postnatal lung development. Now that these individuals are reaching adulthood, there is growing concern that early-life oxygen exposure may also promote cardiovascular disease through poorly understood mechanisms. We previously reported that adult mice exposed to 100% oxygen between postnatal days 0-4 develop pulmonary hypertension defined pathologically by capillary rarefaction, dilation of arterioles and veins, cardiac failure, and a reduced lifespan...
January 18, 2018: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29344955/development-of-an-advanced-two-dimensional-microdosimetric-detector-based-on-thick-gas-electron-multipliers
#18
Sahar Darvish-Molla, William V Prestwich, Soo Hyun Byun
PURPOSE: The THick Gas Electron Multiplier (THGEM) based tissue-equivalent proportional counter (TEPC) has been proven to be useful for microdosimetry due to its flexibility in varying the gaseous sensitive volume and achieving high multiplication gain. Aiming at measuring the spatial distribution of radiation dose for mixed neutron-gamma fields, an advanced two-dimensional (2-D) THGEM TEPC was designed and constructed at McMaster University which will enable us to overcome the operational limitation of the classical TEPCs, particularly for high dose rate fields...
January 18, 2018: Medical Physics
https://www.readbyqxmd.com/read/29344868/laser-capture-microdissection-for-the-analysis-of-rat-and-human-spinal-cord-ependyma-by-qpcr
#19
Daniel Garcia-Ovejero, Beatriz Paniagua-Torija, Angel Arevalo-Martin, Beatriz Navarro-Galve, Eduardo Molina-Holgado
In the last few decades many efforts have been dedicated to decipher the nature and regenerative potential of neurogenic niches and endogenous stem cells after damage of the central nervous system. In the spinal cord, it has been largely focused on the ependymal region, which hosts neural precursors/stem cells (NSC) in rodents but differs between species and ages. In the current chapter, we detail our protocol to study the gene expression profile of this region using fresh frozen blocks of rat and human post-mortem spinal cords...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29344864/laser-capture-microdissection-in-traumatic-brain-injury-research-obtaining-hippocampal-subregions-and-pools-of-injured-neurons-for-genomic-analyses
#20
Deborah R Boone, Harris A Weisz, Stacy L Sell, Helen L Hellmich
The methods presented here are based on our laboratory's 15 years of experience using laser capture microdissection to obtain samples for the study of gene expression after traumatic brain injury (TBI) using a well-established rat model of experimental TBI. Here, we describe how to use the ArcturusXT laser capture microdissection system to capture swaths of specific regions of the rat hippocampus as well as specific neuronal populations defined by Fluoro-Jade C staining. Staining with Fluoro-Jade C identifies a neuron that is in the process of degeneration...
2018: Methods in Molecular Biology
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