keyword
MENU ▼
Read by QxMD icon Read
search

Biased molecules

keyword
https://www.readbyqxmd.com/read/28808721/unveiling-universal-trends-for-the-energy-level-alignment-in-organic-oxide-interfaces
#1
José I Martínez, Fernando Flores, José Ortega, Sylvie Rangan, Charles M Ruggieri, Robert A Bartynski
In this perspective we present a comprehensive analysis of the energy level alignment at the interface between an organic monolayer (organic = perylenetetracarboxylic dianhydride, PTCDA, zinc tetraphenylporphyrin, Zn-TPP, and tetracyanoquinodimethane, TCNQ) and a prototypical oxide surface, TiO2(110), looking for universal behaviours. PTCDA shows a physisorbed interaction with TiO2 and a small interface dipole potential with its highest occupied molecular orbital (HOMO) energy level located in the oxide energy gap and the lowest occupied molecular orbital (LUMO) energy level located above the oxide conduction band minimum, EC...
August 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28805877/a-dna-bipedal-nanowalker-with-a-piston-like-expulsion-stroke
#2
Q Y Yeo, I Y Loh, S R Tee, Y H Chiang, J Cheng, M H Liu, Z S Wang
Artificial molecular walkers beyond burn-bridge designs are important for nanotechnology, but their systematic development remains difficult. Herein, we have reported a new rationally designed DNA walker-track system and experimentally verified a previously proposed general expulsion regime for implementing non-burn-bridge nanowalkers. The DNA walker has an optically powered engine motif that reversibly extends and contracts the walker via a quadruplex-duplex conformational change. The walker's extension is an energy-absorbing and force-generating process, which drives the walker's leg dissociation off-track in a piston-like expulsion stroke...
August 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28805817/room-temperature-current-blockade-in-atomically-defined-single-cluster-junctions
#3
Giacomo Lovat, Bonnie Choi, Daniel W Paley, Michael L Steigerwald, Latha Venkataraman, Xavier Roy
Fabricating nanoscopic devices capable of manipulating and processing single units of charge is an essential step towards creating functional devices where quantum effects dominate transport characteristics. The archetypal single-electron transistor comprises a small conducting or semiconducting island separated from two metallic reservoirs by insulating barriers. By enabling the transfer of a well-defined number of charge carriers between the island and the reservoirs, such a device may enable discrete single-electron operations...
August 14, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28796418/role-of-the-gm1-ganglioside-oligosaccharide-portion-in-the-trka-dependent-neurite-sprouting-in-neuroblastoma-cells
#4
Elena Chiricozzi, Diego Yuri Pomè, Margherita Maggioni, Erika Di Biase, Chiara Parravicini, Luca Palazzolo, Nicoletta Loberto, Ivano Eberini, Sandro Sonnino
GM1 ganglioside (II(3) NeuAc-Gg4 Cer) is known to promote neurite formation in neuroblastoma cells by activating TrkA-MAPK pathway. The molecular mechanism by which GM1 is involved in the neurodifferentiation process is still unknown, however, in vitro and in vivo evidences have suggested that the oligosaccharide portion of this ganglioside could be involved. Here, we report that, similarly to the entire GM1 molecule, its oligosaccharide II(3) NeuAc-Gg4, rather than its ceramide (Cer) portion is responsible for the neurodifferentiation process by augmenting neurite elongation and increasing the neurofilament protein expression in murine neuroblastoma cells, Neuro2a...
August 10, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28789548/brownian-dynamics-of-a-protein-polymer-chain-complex-in-a-solid-state-nanopore
#5
Craig C Wells, Dmitriy V Melnikov, Maria E Gracheva
We study the movement of a polymer attached to a large protein inside a nanopore in a thin silicon dioxide membrane submerged in an electrolyte solution. We use Brownian dynamics to describe the motion of a negatively charged polymer chain of varying lengths attached to a neutral protein modeled as a spherical bead with a radius larger than that of the nanopore, allowing the chain to thread the nanopore but preventing it from translocating. The motion of the protein-polymer complex within the pore is also compared to that of a freely translocating polymer...
August 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28789544/the-low-bias-conducting-mechanism-of-single-molecule-junctions-constructed-with-methylsulfide-linker-groups-and-gold-electrodes
#6
Minglang Wang, Yongfeng Wang, Stefano Sanvito, Shimin Hou
The atomic structure and electronic transport properties of two types of molecular junctions, in which a series of saturated and conjugated molecules are symmetrically connected to gold electrodes through methylsulfide groups, are investigated using the non-equilibrium Green's function formalism combined with density functional theory. Our calculations show that the low-bias junction conductance is determined by the electronic tunneling between the two Au-S donor-acceptor bonds formed at the molecule-electrode interfaces...
August 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28782141/elucidation-of-dual-magnetic-relaxation-processes-in-dinuclear-dysprosium-iii-phthalocyaninato-triple-decker-single-molecule-magnets-depending-on-the-octacoordination-geometry
#7
Keiichi Katoh, Yu Aizawa, Takaumi Morita, Brian K Breedlove, Masahiro Yamashita
When applying single-molecule magnets (SMMs) to spintronic devices, control of the quantum tunneling of the magnetization (QTM) as well as a spin-lattice interactions are important. Attempts have been made to use not only coordination geometry but also magnetic interactions between SMMs as an exchange bias. In this manuscript, we report that dinuclear dysprosium(III) (DyIII) SMMs with the same octacoordination geometry undergo dual magnetic relaxation processes at low temperature. In the dinuclear DyIII phthalocyaninato (Pc2-) triple-decker type complex [(Pc)Dy(ooPc)Dy(Pc)] (1) (ooPc2- = 2,3,9,10,16,17,23,24-octakis(octyloxy)-19H,31H-phthalocyaninato) with a square-antiprismatic (SAP) geometry, the ground state is divided by the Zeeman effect, and level intersection occurs when a magnetic field is applied...
August 7, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28780873/control-of-rectification-in-molecular-junctions-contact-effects-and-molecular-signature
#8
Quyen Van Nguyen, Pascal Martin, Denis Frath, Maria Luisa Della Rocca, Frederic Lafolet, Clément Barraud, Philippe Lafarge, Vineetha Mukundan, David James, Richard L McCreery, Jean-Christophe Lacroix
Thin layers of oligomers with thickness between 7 and 9 nm were deposited on flat gold electrode surfaces by electrochemical reduction of diazonium reagents, then a Ti(2 nm)/Au top contact was applied to complete a solid-state molecular junction. The molecular layers investigated included donor molecules with relatively high energy HOMO, molecules with high HOMO-LUMO gaps and acceptor molecules with low energy LUMO and terminal alkyl chain. Using an oligo(bisthienylbenzene) based layer, a molecule whose HOMO energy level in vacuum is close to the fermi level of the gold bottom electrode, the devices exhibit robust and highly reproducible rectification ratios above 1000 at low voltage (2...
August 6, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28780644/immunopotentiator-thymosin-alpha-1-promotes-neurogenesis-and-cognition-in-the-developing-mouse-via-a-systemic-th1-bias
#9
Ge Wang, Fen He, Yunlong Xu, Yuwei Zhang, Xiao Wang, Chunhua Zhou, Yihong Huang, Juntao Zou
In early life, the immune system plays an essential role in brain development. In our study, the immunopotentiator thymosin alpha-1 (Ta1) was peripherally administered to neonatal mice to explore whether the peripheral immunopotentiator affects neurodevelopment and cognition, and to further investigate the relevant mechanism. Compared with the control group, the Ta1 mice displayed better cognitive abilities in early life. The numbers of 5-bromodeoxyuridine (BrdU)+, nestin+, T-box transcription factor 2 (Tbr2)+, BrdU+/doublecortin (DCX)+, BrdU+/ionized calcium-binding adaptor molecule 1 (Iba1)+, and BrdU+/neuronal nuclei (NeuN)+ cells in the hippocampus were increased in the Ta1 group, accompanied by increased interleukin-4 (IL-4), interferon-gamma, brain-derived neurotrophic factor, nerve growth factor, and insulin-like growth factor-1 as well as decreased IL-6 and tumor necrosis factor-α...
August 5, 2017: Neuroscience Bulletin
https://www.readbyqxmd.com/read/28771624/lc-ms-ms-versus-tlc-plus-gc-methods-consistency-of-glycerolipid-and-fatty-acid-profiles-in-microalgae-and-higher-plant-cells-and-effect-of-a-nitrogen-starvation
#10
Juliette Jouhet, Josselin Lupette, Olivier Clerc, Leonardo Magneschi, Mariette Bedhomme, Séverine Collin, Sylvaine Roy, Eric Maréchal, Fabrice Rébeillé
Methods to analyze lipidomes have considerably evolved, more and more based on mass spectrometry technics (LC-MS/MS). However, accurate quantifications using these methods require 13C-labeled standards for each lipid, which is not feasible because of the very large number of molecules. Thus, quantifications rely on standard molecules representative of a whole class of lipids, which might lead to false estimations of some molecular species. Here, we determined and compared glycerolipid distributions from three different types of cells, two microalgae (Phaeodactylum tricornutum, Nannochloropsis gaditana) and one higher plant (Arabidopsis thaliana), using either LC-MS/MS or Thin Layer Chromatography coupled with Gas Chromatography (TLC-GC), this last approach relying on the precise quantification of the fatty acids present in each glycerolipid class...
2017: PloS One
https://www.readbyqxmd.com/read/28767678/pharmacoperone-rescue-of-vasopressin-2-receptor-mutants-reveals-unexpected-constitutive-activity-and-coupling-bias
#11
Jo Ann Janovick, Timothy P Spicer, Thomas D Bannister, Louis Scampavia, P Michael Conn
Pharmacoperones are small molecules that diffuse into cells and rescue misfolded, mistrafficked protein mutants, restoring their function. These substances act with high target specificity, serving as templates to fold (or refold) receptors, enzymes, ion channels or other proteins and enable them to pass the scrutiny of the cellular quality control system ("rescue"). In the present study we demonstrate that a rescued mutant (L83Q) of the vasopressin type 2 receptor (V2R), shows a strong bias for Gs coupling unlike the WT V2 receptor, which couples to both Gs and Gq/11...
2017: PloS One
https://www.readbyqxmd.com/read/28767116/a-surprising-way-to-control-the-charge-transport-in-molecular-electronics-the-subtle-impact-of-the-coverage-of-self-assembled-monolayers-of-floppy-molecules-adsorbed-on-metallic-electrodes
#12
Ioan Bâldea
Inspired by earlier attempts in organic electronics aiming at controlling charge injection from metals into organic materials by manipulating the Schottky energy barrier using self-assembled monolayers (SAMs), recent experimental and theoretical work in molecular electronics showed that metal-organic interfaces can be controlled via changes in the metal work function that are induced by SAMs. In this paper we indicate a different route to achieve interface-driven control over the charge transfer/transport at the molecular scale...
August 2, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28762339/deep-learning-for-single-molecule-science
#13
Tim Albrecht, Gregory Slabaugh, Eduardo Alonso, Masudur R Al-Arif
Exploring and making predictions based on single-molecule data can be challenging, not only due to the sheer size of the datasets, but also because a priori knowledge about the signal characteristics is typically limited and poor signal-to-noise ratio. For example, hypothesis-driven data exploration, informed by an expectation of the signal characteristics, can lead to interpretation bias or loss of information. Equally, even when the different data categories are known, e.g., the four bases in DNA sequencing, it is often difficult to know how to make best use of the available information content...
August 1, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28759257/in-search-of-lost-small-peptides
#14
Serge Plaza, Gerben Menschaert, François Payre
A large body of evidence indicates that genome annotation pipelines have biased our view of coding sequences because they generally undersample small proteins and peptides. The recent development of genome-wide translation profiling reveals the prevalence of small/short open reading frames (smORFs or sORFs), which are scattered over all classes of transcripts, including both mRNAs and presumptive long noncodingRNAs. Proteomic approaches further confirm an unexpected variety of smORF-encoded peptides (SEPs), representing an overlooked reservoir of bioactive molecules...
July 31, 2017: Annual Review of Cell and Developmental Biology
https://www.readbyqxmd.com/read/28758096/type-2-diabetes-mellitus-and-risk-of-hepatocellular-carcinoma-spotlight-on-nonalcoholic-fatty-liver-disease
#15
REVIEW
Alessandro Mantovani, Giovanni Targher
The incidence of both type 2 diabetes mellitus (T2DM) and multiple cancer types are rapidly increasing worldwide. Several studies documented that T2DM is closely associated with an increased incidence of cancer. However, while some methodological considerations preclude a definitive association between T2DM and the risk of certain cancers, the relationship between T2DM and increased risk of incident hepatocellular carcinoma (HCC) remains significant even after adjustment for detection bias and reverse causation, indicating that such association is clinically reliable and robust...
July 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28753565/enhanced-response-of-melanoma-cells-to-mek-inhibitors-following-unbiased-igf-1r-down-regulation
#16
Naida Suleymanova, Caitrin Crudden, Claire Worrall, Anica Dricu, Ada Girnita, Leonard Girnita
Due to its ability to compensate for signals lost following therapeutic MAPK-inhibition, insulin-like growth factor type 1 receptor (IGF-1R) co-targeting is a rational approach for melanoma treatment. However IGF-1R conformational changes associated with its inhibition can preferentially activate MAPK-pathway in a kinase-independent manner, through a process known as biased signaling. We explored the impact of biased IGF-1R signaling, on response to MAPK inhibition in a panel of skin melanoma cell lines with differing MAPK and p53 mutation statuses...
July 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/28752873/dietary-linoleic-acid-intake-and-blood-inflammatory-markers-a-systematic-review-and-meta-analysis-of-randomized-controlled-trials
#17
Hang Su, Ruijie Liu, Ming Chang, Jianhua Huang, Xingguo Wang
PURPOSE: The aim of the present study was to investigate the effect of increasing dietary linoleic acid (LA) intake on the blood concentrations of inflammatory markers including cytokines, acute phase reactants and adhesion molecules in adults. METHODS: We comprehensively searched PubMed, Embase and Cochrane Library for eligible studies. Overall, 30 randomized controlled studies involving 1377 subjects were included for meta-analysis. RESULTS: No significant effect of higher LA intake was observed for cytokines: tumor necrosis factor (SMD: -0...
July 28, 2017: Food & Function
https://www.readbyqxmd.com/read/28752825/dc-biased-low-frequency-insulating-constriction-dielectrophoresis-for-protein-biomolecules-concentration
#18
Peng Zhang, Yuxin Liu
Sample enrichment or molecules concentration is considered as an essential step for sample processing in miniaturized devices aiming at biosensing and bioanalysis. Among all the means involved to achieve this aim, dielectrophoresis (DEP) is increasingly employed in molecules manipulation and concentration because it is non-destructive and high efficiency. This paper presents a methodology to achieve protein concentration utilizing the combination effects of electrokinetics and low frequency insulator-based dielectrophoresis (iDEP) generated within a microfluidic device, in which a submicron constricted channel was fabricated using DNA molecular combing and replica molding...
July 28, 2017: Biofabrication
https://www.readbyqxmd.com/read/28746336/discovery-of-novel-brain-permeable-and-g-protein-biased-beta-1-adrenergic-receptor-partial-agonists-for-the-treatment-of-neurocognitive-disorders
#19
Bitna Yi, Alam Jahangir, Andrew K Evans, Denise Briggs, Kristine Ravina, Jacqueline Ernest, Amir B Farimani, Wenchao Sun, Jayakumar Rajadas, Michael Green, Evan N Feinberg, Vijay S Pande, Mehrdad Shamloo
The beta-1 adrenergic receptor (ADRB1) is a promising therapeutic target intrinsically involved in the cognitive deficits and pathological features associated with Alzheimer's disease (AD). Evidence indicates that ADRB1 plays an important role in regulating neuroinflammatory processes, and activation of ADRB1 may produce neuroprotective effects in neuroinflammatory diseases. Novel small molecule modulators of ADRB1, engineered to be highly brain permeable and functionally selective for the G protein with partial agonistic activity, could have tremendous value both as pharmacological tools and potential lead molecules for further preclinical development...
2017: PloS One
https://www.readbyqxmd.com/read/28737933/efficient-application-of-continuous-fractional-component-monte-carlo-in-the-reaction-ensemble
#20
Ali Poursaeidesfahani, Remco Hens, Ahmadreza Rahbari, Mahinder Ramdin, David Dubbeldam, Thijs J H Vlugt
A new formulation of the Reaction Ensemble Monte Carlo technique (RxMC) combined with the Continuous Fractional Component Monte Carlo method is presented. This method is denoted by serial Rx/CFC. The key ingredient is that fractional molecules of either reactants or reaction products are present and that chemical reactions always involve fractional molecules. Serial Rx/CFC has the following advantages compared to other approaches: (1) One directly obtains chemical potentials of all reactants and reaction products...
August 7, 2017: Journal of Chemical Theory and Computation
keyword
keyword
118806
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"