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https://www.readbyqxmd.com/read/29166656/fragmentation-modes-and-the-evolution-of-life-cycles
#1
Yuriy Pichugin, Jorge Peña, Paul B Rainey, Arne Traulsen
Reproduction is a defining feature of living systems. To reproduce, aggregates of biological units (e.g., multicellular organisms or colonial bacteria) must fragment into smaller parts. Fragmentation modes in nature range from binary fission in bacteria to collective-level fragmentation and the production of unicellular propagules in multicellular organisms. Despite this apparent ubiquity, the adaptive significance of fragmentation modes has received little attention. Here, we develop a model in which groups arise from the division of single cells that do not separate but stay together until the moment of group fragmentation...
November 22, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/29166619/extensive-homeostatic-t-cell-phenotypic-variation-within-the-collaborative-cross
#2
Jessica B Graham, Jessica L Swarts, Michael Mooney, Gabrielle Choonoo, Sophia Jeng, Darla R Miller, Martin T Ferris, Shannon McWeeney, Jennifer M Lund
The Collaborative Cross (CC) is a panel of reproducible recombinant inbred mouse strains with high levels of standing genetic variation, affording an unprecedented opportunity to perform experiments in a small animal model containing controlled genetic diversity while allowing for genetic replicates. Here, we advance the utility of this unique mouse resource for immunology research because it allows for both examination and genetic dissection of mechanisms behind adaptive immune states in mice with distinct and defined genetic makeups...
November 21, 2017: Cell Reports
https://www.readbyqxmd.com/read/29166618/ipsc-based-compound-screening-and-in%C3%A2-vitro-trials-identify-a-synergistic-anti-amyloid-%C3%AE-combination-for-alzheimer-s-disease
#3
Takayuki Kondo, Keiko Imamura, Misato Funayama, Kayoko Tsukita, Michiyo Miyake, Akira Ohta, Knut Woltjen, Masato Nakagawa, Takashi Asada, Tetsuaki Arai, Shinobu Kawakatsu, Yuishin Izumi, Ryuji Kaji, Nobuhisa Iwata, Haruhisa Inoue
In the process of drug development, in vitro studies do not always adequately predict human-specific drug responsiveness in clinical trials. Here, we applied the advantage of human iPSC-derived neurons, which offer human-specific drug responsiveness, to screen and evaluate therapeutic candidates for Alzheimer's disease (AD). Using AD patient neurons with nearly 100% purity from iPSCs, we established a robust and reproducible assay for amyloid β peptide (Aβ), a pathogenic molecule in AD, and screened a pharmaceutical compound library...
November 21, 2017: Cell Reports
https://www.readbyqxmd.com/read/29166386/you-prime-what-you-code-the-faim-model-of-priming-of-pop-out
#4
Wouter Kruijne, Martijn Meeter
Our visual brain makes use of recent experience to interact with the visual world, and efficiently select relevant information. This is exemplified by speeded search when target- and distractor features repeat across trials versus when they switch, a phenomenon referred to as intertrial priming. Here, we present fAIM, a computational model that demonstrates how priming can be explained by a simple feature-weighting mechanism integrated into an established model of bottom-up vision. In fAIM, such modulations in feature gains are widespread and not just restricted to one or a few features...
2017: PloS One
https://www.readbyqxmd.com/read/29166346/options-in-acellular-dermal-matrix-device-assembly
#5
Steven Sigalove
Prepectoral prosthetic breast reconstruction has become increasingly popular during the last several years. Original shortcomings and poor outcomes in the 1970s have been overcome with the use of the bioengineered breast concept-namely, use of improved form stable breast implants, autologous fat grafting, and acellular dermal matrices (ADMs). Careful use of these reconstructive tools combined with improved mastectomy skin flaps has lead to successful early outcomes. Prepectoral breast reconstruction mitigates the animation deformities and muscle tightness previously associated with dual-plane prosthetic breast reconstruction while at the same time producing reproducible and outstanding aesthetic outcomes...
December 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29166123/tunneling-of-coupled-methyl-quantum-rotors-in-4-methylpyridine-single-rotor-potential-versus-coupling-interaction
#6
Somayeh Khazaei, Daniel Sebastiani
We study the influence of rotational coupling between a pair of methyl rotators on the tunneling spectrum in condensed phase. Two interacting adjacent methyl groups are simulated within a coupled-pair model composed of static rotational potential created by the chemical environment and the interaction potential between two methyl groups. We solve the two-dimensional time-independent Schrödinger equation analytically by expanding the wave functions on the basis set of two independent free-rotor functions. We investigate three scenarios which differ with respect to the relative strength of single-rotor and coupling potential...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166095/computer-simulations-of-alkali-acetate-solutions-accuracy-of-the-forcefields-in-difference-concentrations
#7
Emma Ahlstrand, Julio Zukerman Schpector, Ran Friedman
When proteins are solvated in electrolyte solutions that contain alkali ions, the ions interact mostly with carboxylates on the protein surface. Correctly accounting for alkali-carboxylate interactions is thus important for realistic simulations of proteins. Acetates are the simplest carboxylates that are amphipathic, and experimental data for alkali acetate solutions are available and can be compared with observables obtained from simulations. We carried out molecular dynamics simulations of alkali acetate solutions using polarizable and non-polarizable forcefields and examined the ion-acetate interactions...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166062/nonadiabatic-photodissociation-dynamics-of-the-hydroxymethyl-radical-via-the-2-2-a-3s-rydberg-state-a-four-dimensional-quantum-study
#8
Changjian Xie, Christopher Malbon, David R Yarkony, Hua Guo
The quantum mechanical nonadiabatic photodissociation dynamics of the hydroxymethyl (CH2OH) radical in its lowest absorption band is investigated for the first time on a set of coupled diabatic potential energy surfaces determined by accurately fitting a large set of ab initio data. In this two-state approximation, only the ground and first excited states of CH2OH, which are coupled by conical intersections, are included. The reduced-dimensional dynamical model includes the CO stretch, the COH bend, the HCOH torsion, and the O-H dissociation coordinate...
June 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29165997/materials-for-the-recovery-of-uranium-from-seawater
#9
Carter W Abney, Richard T Mayes, Tomonori Saito, Sheng Dai
More than 1000× uranium exists in the oceans than exists in terrestrial ores. With nuclear power generation expected to increase over the coming decades, access to this unconventional reserve is a matter of energy security. With origins in the mid-1950s, materials have been developed for the selective recovery of seawater uranium for more than six decades, with a renewed interest in particular since 2010. This review comprehensively surveys materials developed from 2000-2016 for recovery of seawater uranium, in particular including recent developments in inorganic materials; polymer adsorbents and related research pertaining to amidoxime; and nanostructured materials such as metal-organic frameworks, porous-organic polymers, and mesoporous carbons...
November 22, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/29165984/on-chip-lipid-extraction-using-super-absorbent-polymers-for-mass-spectrometry
#10
Geul Bang, Young Hwan Kim, Junghyo Yoon, Yeong Jun Yu, Seok Chung, Jeong Ah Kim
Pre-treatment of samples is the one of most important steps in analytical methods for efficient and accurate results. Typically, an extraction method used for lipid analysis with mass spectrometry is accompanied by complex liquid-liquid extraction. We have devised a simple, rapid, and efficient lipid extraction method using super absorbent polymers (SAPs) and developed a high-throughput lipid extraction platform based on a microfluidic system. Since SAPs can rapidly absorb an aqueous solution from a raw sample and convert it into the gel, the lipid extraction process can be remarkably simplified...
November 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29165980/controlled-insertion-of-planar-defect-in-inverse-opals-for-anti-counterfeiting-applications
#11
Yongjoon Heo, Su Yeon Lee, Ji-Won Kim, Tae Yoon Jeon, Shin-Hyun Kim
Inverse opals have been used for structural coloration and photonic applications owing to their photonic bandgap properties. When the photonic structures contain planar defects, they provide defect modes, which are useful for lasing, sensing, and waveguiding. However, it remains a challenge to insert a planar defect into inverse opals in a reproducible manner. Here, we report a new method for producing planar-defect-inserted inverse opals using sequential capillary wetting of colloidal crystals and creating micropatterns through photolithography...
November 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29165912/reproducibility-of-radioactive-iodine-uptake-raiu-measurements
#12
Matthieu Pelletier-Galarneau, Patrick Martineau, Ran Klein, Matthew Henderson, Lionel S Zuckier
BACKGROUND: Measurement of radioactive iodine uptake (RAIU) is an important aspect of the assessment and treatment of patients with hyperthyroidism. Its uncertainty affects how much of a true change in RAIU can be detected as well as appropriateness of the therapy dosage upon which it is based. In this study, a method of estimating the reproducibility and least significant change (LSC) values for RAIU measurements, and the implications of the values observed are discussed, with emphasis on application to quality assurance initiatives...
November 22, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29165568/second-harmonic-generation-reveals-subtle-fibrosis-differences-in-adult-and-pediatric-nonalcoholic-fatty-liver-disease
#13
Feng Liu, Jing-Min Zhao, Hui-Ying Rao, Wei-Miao Yu, Wei Zhang, Neil D Theise, Aileen Wee, Lai Wei
Objectives: Investigate subtle fibrosis similarities and differences in adult and pediatric nonalcoholic fatty liver disease (NAFLD) using second harmonic generation (SHG). Methods: SHG/two-photon excitation fluorescence imaging quantified 100 collagen parameters and determined qFibrosis values by using the nonalcoholic steatohepatitis (NASH) Clinical Research Network (CRN) scoring system in 62 adult and 36 pediatric NAFLD liver specimens. Results: Six distinct parameters identified differences among the NASH CRN stages with high accuracy (area under the curve, 0835-0...
November 20, 2017: American Journal of Clinical Pathology
https://www.readbyqxmd.com/read/29165406/-the-significance-of-fibroblasts-in-experimental-modeling-of-proliferative-vitreoretinopathy
#14
I P Khoroshilova-Maslova, N L Leparskaya, E A Vorotelyak, A V Vasiliev
AIM: to investigate the role of heterogeneous fibroblasts in the development of epiretinal membrane in eyes with modeled proliferative vitreoretinopathy. MATERIAL AND METHODS: The material for investigation were 6 eyes of 3 Chinchilla rabbits. Suspended fibroblasts (fibroblasts of the human skin - 200000 cells in 0.1 ml) were injected into the vitreous cavity via the pars plana. The animals were followed up for 1 month and then made out of the experiment. The eyes were enucleated and fixed in 10% neutral buffered formalin for routine histological examination...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/29165394/wxc-%C3%AE-sic-nanocomposite-catalysts-used-in-aqueous-phase-hydrogenation-of-furfural
#15
Jacek Rogowski, Mariusz Andrzejczuk, Joanna Berlowska, Michal Binczarski, Dorota Kregiel, Andrzej Kubiak, Magdalena Modelska, Elzbieta Szubiakiewicz, Andrei Stanishevsky, Jolanta Tomaszewska, Izabela Alina Witonska
This study investigates the effects of the addition of tungsten on the structure, phase composition, textural properties and activities of β-SiC-based catalysts in the aqueous phase hydrogenation of furfural. Carbothermal reduction of SiO₂ in the presence of WO₃ at 1550 °C in argon resulted in the formation of WxC-β-SiC nanocomposite powders with significant variations in particle morphology and content of WxC-tipped β-SiC nano-whiskers, as revealed by TEM and SEM-EDS. The specific surface area (SSA) of the nanocomposite strongly depended on the amount of tungsten and had a notable impact on its catalytic properties for the production of furfuryl alcohol (FA) and tetrahydrofurfuryl alcohol (THFA)...
November 22, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29165247/t2n-as-a-new-tool-for-robust-electrophysiological-modeling-demonstrated-for-mature-and-adult-born-dentate-granule-cells
#16
Marcel Beining, Lucas Alberto Mongiat, Stephan Wolfgang Schwarzacher, Hermann Cuntz, Peter Jedlicka
Compartmental models are the theoretical tool of choice for understanding single neuron computations. However, many models are incomplete, built ad hoc and require tuning for each novel condition rendering them of limited usability. Here, we present T2N, a powerful interface to control NEURON with Matlab and TREES toolbox, which supports generating models stable over a broad range of reconstructed and synthetic morphologies. We illustrate this for a novel, highly-detailed active model of dentate granule cells (GCs) replicating a wide palette of experiments from various labs...
November 22, 2017: ELife
https://www.readbyqxmd.com/read/29165245/computational-modeling-of-spinal-circuits-controlling-limb-coordination-and-gaits-in-quadrupeds
#17
Simon M Danner, Natalia A Shevtsova, Alain Frigon, Ilya A Rybak
Interactions between cervical and lumbar spinal circuits are mediated by long propriospinal neurons (LPNs). Ablation of descending LPNs in mice disturbs left-right coordination at high speeds without affecting fore-hind alternation. We developed a computational model of spinal circuits consisting of four rhythm generators coupled by commissural interneurons (CINs), providing left-right interactions, and LPNs, mediating homolateral and diagonal interactions. The proposed CIN and diagonal LPN connections contribute to speed-dependent gait transition from walk, to trot, and then to gallop and bound; the homolateral LPN connections ensure fore-hind alternation in all gaits...
November 22, 2017: ELife
https://www.readbyqxmd.com/read/29165079/comparison-of-clobetasol-propionate-generics-using-simplified-in-vitro-bioequivalence-method-for-topical-drug-products
#18
Kelen Carine Costa Soares, Weidson Carlos de Souza, Leonardo de Souza Texeira, Marcilio Sergio Soares da Cunha-Filho, Guilherme Martins Gelfuso, Tais Gratieri
The aim of this paper is to propose a simple in vitro skin penetration experiment in which the drug is extracted from the whole skin piece as a test valid for formulation screening and optimization during development process, equivalence assessment during quality control or post-approval after changes to the product. Twelve clobetasol propionate (CP) formulations (six creams and six ointments) from the local market were used as a model to challenge the proposed methodology in comparison to in vitro skin penetration following tape-stripping for drug extraction...
November 20, 2017: Current Drug Delivery
https://www.readbyqxmd.com/read/29164898/ionic-solution-what-goes-right-and-wrong-with-continuum-solvation-modeling
#19
Changhao Wang, Pengyu Ren, Ray Luo
Solvent-mediated electrostatic interactions were well recognized to be important in the structure and function of molecular systems. Ionic interaction is an important component in electrostatic interactions, especially in highly charged molecules, such as nucleic acids. Here we focus on the quality of the widely used PBSA continuum models in modeling ionic interactions by comparing with both explicit solvent simulations and experiment. In this work, the molality-dependent chemical potentials for sodium chloride (NaCl) electrolyte were first simulated in the SPC/E explicit solvent...
November 22, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29164868/large-scale-lithography-free-production-of-transparent-nanostructured-surface-for-dual-functional-electrochemical-and-sers-sensing
#20
Kuldeep Sanger, Onur Durucan, Kaiyu Wu, Anil Haraksingh Thilsted, Arto R Heiskanen, Tomas Rindzevicius, Michael Stenbæk Schmidt, Kinga Zór, Anja Boisen
In this work, we present a dual-functional sensor that can perform surface-enhanced Raman spectroscopy (SERS) based identification and electrochemical (EC) quantification of analytes in liquid samples. A lithography-free reactive ion etching process was utilized to obtain nanostructures of high aspect ratios distributed homogeneously on a 4-inch fused silica wafer. The sensor was made up of three-electrode array, obtained by subsequent e-beam evaporation of Au on nanostructures in selected areas through a shadow mask...
November 22, 2017: ACS Sensors
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