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https://www.readbyqxmd.com/read/28721624/on-the-successful-use-of-a-simplified-model-to-simulate-the-succession-of-toxic-cyanobacteria-in-a-hypereutrophic-reservoir-with-a-highly-fluctuating-water-level
#1
Ali Fadel, Bruno J Lemaire, Brigitte Vinçon-Leite, Ali Atoui, Kamal Slim, Bruno Tassin
Many freshwater bodies worldwide that suffer from harmful algal blooms would benefit for their management from a simple ecological model that requires few field data, e.g. for early warning systems. Beyond a certain degree, adding processes to ecological models can reduce model predictive capabilities. In this work, we assess whether a simple ecological model without nutrients is able to describe the succession of cyanobacterial blooms of different species in a hypereutrophic reservoir and help understand the factors that determine these blooms...
July 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28721458/a-functional-compartmental-model-of-the-synechocystis-pcc-6803-phycobilisome
#2
Ivo H M van Stokkum, Michal Gwizdala, Lijin Tian, Joris J Snellenburg, Rienk van Grondelle, Herbert van Amerongen, Rudi Berera
In the light-harvesting antenna of the Synechocystis PCC 6803 phycobilisome (PB), the core consists of three cylinders, each composed of four disks, whereas each of the six rods consists of up to three hexamers (Arteni et al., Biochim Biophys Acta 1787(4):272-279, 2009). The rods and core contain phycocyanin and allophycocyanin pigments, respectively. Together these pigments absorb light between 400 and 650 nm. Time-resolved difference absorption spectra from wild-type PB and rod mutants have been measured in different quenching and annihilation conditions...
July 18, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28721412/effect-of-ligand-binding-on-a-protein-with-a-complex-folding-landscape
#3
Hisham Mazal, Haim Aviram, Inbal Riven, Gilad Haran
Ligand binding to a protein can stabilize it significantly against unfolding. The variation of the folding free energy, ΔΔG(0), due to ligand binding can be derived from a simple reaction scheme involving exclusive binding to the native state. One obtains the following expression: , where Kd is the ligand dissociation constant and L is its concentration, R is the universal gas constant and T is the temperature. This expression has been shown to correctly describe experimental results on multiple proteins...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28721279/age-related-circadian-disorganization-caused-by-sympathetic-dysfunction-in-peripheral-clock-regulation
#4
Yu Tahara, Yuta Takatsu, Takuya Shiraishi, Yosuke Kikuchi, Mayu Yamazaki, Hiroaki Motohashi, Aya Muto, Hiroyuki Sasaki, Atsushi Haraguchi, Daisuke Kuriki, Takahiro J Nakamura, Shigenobu Shibata
The ability of the circadian clock to adapt to environmental changes is critical for maintaining homeostasis, preventing disease, and limiting the detrimental effects of aging. To date, little is known about age-related changes in the entrainment of peripheral clocks to external cues. We therefore evaluated the ability of the peripheral clocks of the kidney, liver, and submandibular gland to be entrained by external stimuli including light, food, stress, and exercise in young versus aged mice using in vivo bioluminescence monitoring...
2017: NPJ Aging and Mechanisms of Disease
https://www.readbyqxmd.com/read/28719021/high-temperature-ionic-epitaxy-of-halide-perovskite-thin-film-and-the-hidden-carrier-dynamics
#5
Yiping Wang, Xin Sun, Zhizhong Chen, Yi-Yang Sun, Shengbai Zhang, Toh-Ming Lu, Esther Wertz, Jian Shi
High-temperature vapor phase epitaxy (VPE) has been proved ubiquitously powerful in enabling high-performance electro-optic devices in III-V semiconductor field. A typical example is the successful growth of p-type GaN by VPE for blue light-emitting diodes. VPE excels as it controls film defects such as point/interface defects and grain boundary, thanks to its high-temperature processing condition and controllable deposition rate. For the first time, single-crystalline high-temperature VPE halide perovskite thin film has been demonstrated-a unique platform on unveiling previously uncovered carrier dynamics in inorganic halide perovskites...
July 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28718975/pyrene-mo-shuffle-controlling-excited-state-and-redox-properties-by-changing-the-nature-of-the-frontier-orbitals
#6
Julia Merz, Julian Fink, Alexandra Friedrich, Ivo Krummenacher, Hamad Al Mamari, Sabine Lorenzen, Martin Hähnel, Antonius Eichhorn, Michael Moos, Marco Holzapfel, Holger Braunschweig, Christoph Lambert, Andreas Steffen, Lei Ji, Todd B Marder
We show that by judicious choice of substituents at the 2,7-positions of pyrene, the frontier orbital order of pyrene can be modified, giving enhanced control over the nature and properties of the photoexcited states and the redox potentials. Specifically, we introduced a julolidine-like moiety and Bmes2 (mes = 2,4,6-Me3C6H2) as very strong donor (D) and acceptor (A), respectively, giving 2,7-D-π-D- and unsymmetric 2,7-D-π-A-pyrene derivatives, in which the donor destabilizes the HOMO-1 and the acceptor stabilizes the LUMO+1 of the pyrene core...
July 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28718959/characterization-of-a-highly-al-3-selective-fluorescence-probe-based-on-naphthalimide-schiff-base-and-its-application-to-practical-water-samples
#7
Kesheng Shen, Shanshan Mao, Xinkui Shi, Fei Wang, Yuling Xu, Stephen Opeyemi Aderinto, Huilu Wu
A new fluorescent Al(3+) -probe, N-allyl-4-[3,3'-((2-aminoethyl)azanediyl)-bis(N´-(2-hydroxybenzylidene)propanehy-drazide)]-1,8-naphthalimide (L), was designed and synthesized based on 1,8-naphthalimide. The probe L contains 1,8-naphthalimide moiety as the fluorophore and a Schiff base as the recognition group. The structure of L was determined by single crystal X-ray. L emission at 526 nm increased on addition of Al(3+) under excitation wavelength at 350 nm. L exhibited high selectivity and sensitivity fluorescence emission towards to Al(3+) in ethanol/Tris-HCl buffer solution (1:1, v/v, pH = 7...
July 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28716946/dynamic-fluid-connectivity-during-steady-state-multiphase-flow-in-a-sandstone
#8
Catriona A Reynolds, Hannah Menke, Matthew Andrew, Martin J Blunt, Samuel Krevor
The current conceptual picture of steady-state multiphase Darcy flow in porous media is that the fluid phases organize into separate flow pathways with stable interfaces. Here we demonstrate a previously unobserved type of steady-state flow behavior, which we term "dynamic connectivity," using fast pore-scale X-ray imaging. We image the flow of N2 and brine through a permeable sandstone at subsurface reservoir conditions, and low capillary numbers, and at constant fluid saturation. At any instant, the network of pores filled with the nonwetting phase is not necessarily connected...
July 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28714860/charge-carrier-relaxation-in-ingaas-gaas-quantum-wire-modulation-doped-heterostructures
#9
Serhiy Kondratenko, Sviatoslav Iliash, Yuriy I Mazur, Vasyl P Kunets, Mourad Benamara, Gregory J Salamo
The time dependencies of the carrier relaxation in the modulation-doped InGaAs-GaAs low-dimensional structures with quantum wires have been studied as function of temperature and light excitation levels. The photoconductivity relaxation follows a stretched exponent with decay constant, which depends on morphology of InGaAs epitaxial layers, presence of deep traps and on energy disorder due to inhomogeneous distribution of size and composition. A hopping model, where electrons tunnel between bands of localized states, gives appropriate interpretation for temperature-independent PC decay across the temperature range 150-290 K...
July 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28714719/temporal-ventriloquism-effect-in-european-starlings-evidence-for-two-parallel-processing-pathways
#10
Gesa Feenders, Yoko Kato, Katharina M Borzeszkowski, Georg M Klump
The brain constantly has to interpret stimuli from a range of modalities originating from the same or different objects to create unambiguous percepts. The mechanisms of such multisensory processing have been intensely studied with respect to the time window of integration or the effect of spatial separation. However, the neural mechanisms remain elusive with respect to the role of alerting effects and multisensory integration. We addressed this issue by choosing a test paradigm where we could manipulate potentially alerting stimuli and simultaneously activating stimuli independently: We measured the temporal ventriloquism effect in European starlings by using the temporal order judgment paradigm with subjects judging the temporal order of the lighting of 2 spatially separated lights...
August 2017: Behavioral Neuroscience
https://www.readbyqxmd.com/read/28709871/protein-rna-complexation-driven-by-the-charge-regulation-mechanism
#11
Fernando Luís Barroso da Silva, Philippe Derreumaux, Samuela Pasquali
Electrostatic interactions play a pivotal role in many (bio)molecular association processes. The molecular organization and function in biological systems are largely determined by these interactions from pure Coulombic contributions to more peculiar mesoscopic forces due to ion-ion correlation and proton fluctuations. The latter is a general electrostatic mechanism that gives attraction particularly at low electrolyte concentrations. This charge regulation mechanism due to titrating amino acid and nucleotides residues is discussed here in a purely electrostatic framework...
July 11, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28709340/correlation-and-transport-properties-for-mixtures-at-constant-pressure-and-temperature
#12
Alexander J White, Lee A Collins, Joel D Kress, Christopher Ticknor, Jean Clérouin, Philippe Arnault, Nicolas Desbiens
Transport properties of mixtures of elements in the dense plasma regime play an important role in natural astrophysical and experimental systems, e.g., inertial confinement fusion. We present a series of orbital-free molecular dynamics simulations on dense plasma mixtures with comparison to a global pseudo ion in jellium model. Hydrogen is mixed with elements of increasingly high atomic number (lithium, carbon, aluminum, copper, and silver) at a fixed temperature of 100 eV and constant pressure set by pure hydrogen at 2g/cm^{3}, namely, 370 Mbars...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28708879/real-and-virtual-worlds-alike-adolescents-psychopathology-is-reflected-in-their-videogame-virtual-behaviors
#13
Aviv Segev, Hila Gabay-Weschler, Yossi Naar, Hagai Maoz, Yuval Bloch
Current research refers to videogames as a constant variable. However, games today are designed to be highly interactive and versatile: two players may be using the same videogame, but as a result of different using patterns, the game will not necessarily encompass the same content and gameplay. The current study examined the possible relationship between psychopathology and in-game playing patterns. We hypothesized that adolescents would play videogames differently, in a manner that would reflect their particular psychopathologies...
2017: PloS One
https://www.readbyqxmd.com/read/28707033/impact-of-constant-versus-fluctuating-temperatures-on-the-development-and-life-history-parameters-of-tetranychus-urticae-acari-tetranychidae
#14
M S Y I Bayu, M S Ullah, Y Takano, T Gotoh
The impact of daily temperature fluctuations on arthropod life history parameters is inadequately studied compared with the ample amount of research that has been conducted on the effects of constant temperatures. Fluctuating temperatures are likely to be more realistic, as they are ecologically more similar to what these arthropods experience in nature. Here, we compared the impact of 11 constant temperatures that ranged from 10 to 35 °C with fluctuating temperatures with the same corresponding mean temperature and an amplitude of 10 °C between high (12 h) and low (12 h) temperatures on the development and life history parameters of Tetranychus urticae under continuous light conditions...
July 13, 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/28706748/comparison-of-globus-pallidus-interna-and-subthalamic-nucleus-in-deep-brain-stimulation-for-parkinson-disease-an-institutional-experience-and-review
#15
REVIEW
Shazia Mirza, Umar Yazdani, Richard Dewey Iii, Neepa Patel, Richard B Dewey, Svjetlana Miocinovic, Shilpa Chitnis
Deep Brain Stimulation (DBS) has revolutionized the lives of patients of Parkinson disease, offering therapeutic options to those not benefiting entirely from medications alone. With its proven track record of outperforming the best medical management, the goal is to unlock the full potential of this therapy. Currently, the Globus Pallidus Interna (GPi) and Subthalamic Nucleus (STN) are both viable targets for DBS, and the choice of site should focus on the constellation of symptoms, both motor and nonmotor, which are key determinants to quality of life...
2017: Parkinson's Disease
https://www.readbyqxmd.com/read/28706354/intensities-of-incident-and-transmitted-ultraviolet-a-rays-through-gafchromic-films
#16
Toshizo Katsuda, Rumi Gotanda, Tatsuhiro Gotanda, Takuya Akagawa, Nobuyoshi Tanki, Tadao Kuwano, Atsushi Noguchi, Kouichi Yabunaka
Gafchromic films have been applied to X-ray dosimetry in diagnostic radiology. To correct nonuniformity errors in Gafchromic films, X-rays in the double-exposure technique can be replaced with ultraviolet (UV)-A rays. Intensities of the incident and transmitted UV-A rays were measured. However, it is unclear whether the chemical color change of Gafchromic films affects the UV-A transmission intensity. Gafchromic EBT3 films were suitable to be used in this study because non-UV protection layers are present on both sides of the film...
April 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28705956/rapid-recovery-gene-downregulation-during-excess-light-stress-and-recovery-in-arabidopsis
#17
Peter Alexander Crisp, Diep Ganguly, Aaron B Smith, Kevin D Murray, Gonzalo M Estavillo, Iain R Searle, Ethan Ford, Ozren Bogdanović, Ryan Lister, Justin O Borevitz, Steven R Eichten, Barry J Pogson
Stress recovery may prove to be a promising approach to increase plant performance, and theoretically, mRNA instability may facilitate faster recovery. Transcriptome (RNA-seq, qPCR, sRNA-seq, PARE) and methylome profiling during repeated excess-light stress and recovery was performed at intervals as short as three minutes. We demonstrate that 87% of the stress-upregulated mRNAs analysed exhibit very rapid recovery. For instance, HSP101 abundance declined two-fold every 5.1 minutes. We term this phenomenon Rapid Recovery Gene Downregulation (RRGD), whereby mRNA abundance rapidly decreases promoting transcriptome resetting...
July 13, 2017: Plant Cell
https://www.readbyqxmd.com/read/28704605/protein-adsorption-to-charged-gold-nanospheres-as-a-function-of-protein-deformability
#18
Jordan M Dennison, Jennifer M Zupancic, Wayne Lin, Jonathan H Dwyer, Catherine J Murphy
The corona that forms as protein adsorbs to gold nanospheres (AuNSs) is directly influenced by the surface chemistry of the AuNS. Tools to predict adsorption outcomes are needed for intelligent design of nanomaterials for biological applications. We hypothesized that the denaturation behavior of a protein might be a useful predictor of adsorption behavior to AuNSs, and used this idea to study protein adsorption to anionic citrate capped AuNSs and to cationic poly(allylamine hydrochloride) (PAH) wrapped AuNSs...
July 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28704128/commune-health-workers-methadone-maintenance-treatment-mmt-knowledge-and-perceived-difficulties-providing-decentralized-mmt-services-in-vietnam
#19
Chunqing Lin, Nguyen Anh Tuan, Li Li
BACKGROUND: With the initial establishment of countrywide methadone maintenance therapy (MMT) system, Vietnam is in the process of expanding and decentralizing the MMT program to community-based healthcare settings. OBJECTIVE: The study aimed to measure the MMT-related knowledge and perceived difficulties in treating patient who use drugs (PWUD) among community-based healthcare providers, e.g., commune health workers (CHW), and examine its correlated factors. METHODS: A total of 300 CHW from 60 communes in two provinces of Vietnam completed a survey using Audio Computer-Assisted Self-Interview (ACASI) method...
July 13, 2017: Substance Use & Misuse
https://www.readbyqxmd.com/read/28704060/zno-nanocrystal-networks-near-the-insulator-metal-transition-tuning-contact-radius-and-electron-density-with-intense-pulsed-light
#20
Benjamin L Greenberg, Zachary L Robinson, Konstantin V Reich, Claudia Gorynski, Bryan N Voigt, Lorraine F Francis, Boris I Shklovskii, Eray S Aydil, Uwe R Kortshagen
Networks of ligand-free semiconductor nanocrystals (NCs) offer a valuable combination of high carrier mobility and optoelectronic properties tunable via quantum confinement. In principle, maximizing carrier mobility entails crossing the insulator-metal transition (IMT), where carriers become delocalized. A recent theoretical study predicted that this transition occurs at nρ(3) ≈ 0.3, where n is the carrier density and ρ is the interparticle contact radius. In this work, we satisfy this criterion in networks of plasma-synthesized ZnO NCs by using intense pulsed light (IPL) annealing to tune n and ρ independently...
July 13, 2017: Nano Letters
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