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https://www.readbyqxmd.com/read/29127253/first-biochemical-and-crystallographic-characterization-of-a-fast-performing-ferritin-from-a-marine-invertebrate
#1
E De Meulenaere, J B Bailey, F A Tezcan, D D Deheyn
Ferritin, a multimeric cage-like enzyme, is integral to iron metabolism across all phyla through the sequestration and storage of iron through efficient ferroxidase activity. While ferritin sequences from around 900 species have been identified, crystal structures from only 50 species have been reported, the majority from bacterial origin. We recently isolated a secreted ferritin from the marine invertebrate Chaetopterus sp. (parchment tubeworm), which resides in muddy coastal seafloors. Here, we present the first ferritin from a marine invertebrate to be crystallized, and its biochemical characterization...
November 10, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/29116806/millimeter-sized-hole-damming
#2
So Hung Huynh, Dwayne Chung Kim Chung, Murat Muradoglu, Oi Wah Liew, Tuck Wah Ng
Valves used to control liquid filling and draining processes from storage typically need to be actuated. Here, we show that similar flow enabling and restricting operations can be achieved through millimeter scale holes that function according to the amount of hydrostatic pressure applied without any other intervention. This phenomena is exhibited using receptacles where the base is made of either a hydrophilic or superhydrophobic substrate with hole sizes ranging from 1.0-2.0 mm. The construction is such that the drainage flow velocities are of the same order in both substrates and follow Torricelli's law trends...
November 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29079732/monitoring-ground-water-storage-at-mesoscale-using-seismic-noise-30-years-of-continuous-observation-and-thermo-elastic-and-hydrological-modeling
#3
Thomas Lecocq, Laurent Longuevergne, Helle Anette Pedersen, Florent Brenguier, Klaus Stammler
Groundwater is a vital freshwater resource for both humans and ecosystems. Achieving sustainable management requires a detailed knowledge of the aquifer structure and of its behavior in response to climatic and anthropogenic forcing. Traditional monitoring is carried out using piezometer networks, and recently complemented with new geophysical or satellite-based observations. These techniques survey either local (small-scale) water systems or regional areas (large scale) but, to date, adequate observation tools are lacking at the water management scale (i...
October 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29050419/successful-chilling-of-red-legged-partridge-alectoris-rufa-sperm-for-use-in-artificial-insemination
#4
J Santiago-Moreno, C Castaño, A Toledano-Díaz, M C Esteso, A López-Sebastián, S Villaverde-Morcillo, S G Dávila, M G Gil, E Blesbois
The fertilizing capacity of pure, fresh avian semen may disappear in just half an hour, hindering its successful use in artificial insemination (AI) projects. Longer storage requires the use of infra-physiological temperatures and of semen diluents that help preserve the spermatozoa but that do not interfere with their fertilizing capacity. This study examines the effect on sperm quality of storing red-legged partridge sperm for 3 h at 5°C with 2 different semen extenders: 1) a medium referred to as L&R-84, composed of sodium glutamate, glucose, magnesium acetate, potassium acetate, and polyvinylpyrrolidone, and 2) Lake 7...
September 1, 2017: Poultry Science
https://www.readbyqxmd.com/read/29041103/ultraslow-weak-light-solitons-and-their-storage-and-retrieval-in-a-kagome-structured-hollow-core-photonic-crystal-fiber
#5
Datang Xu, Zhiming Chen, Guoxiang Huang
We investigate the formation and propagation of ultraslow weak-light solitons and their memory in the atomic gas filled in a kagome-structured hollow-core photonic crystal fiber (HC-PCF) via electromagnetically induced transparency (EIT). We show that, due to the strong light-atom coupling contributed by the transverse confinement of the HC-PCF, the EIT and hence the optical Kerr nonlinearity of the system can be largely enhanced, and hence optical solitons with very short formation distance, ultraslow propagation velocity, and extremely low generation power can be realized...
August 7, 2017: Optics Express
https://www.readbyqxmd.com/read/29019666/airborne-methane-emission-measurements-for-selected-oil-and-gas-facilities-across-california
#6
Shobhit Mehrotra, Ian Faloona, Maxime Suard, Stephen Conley, Marc L Fischer
We report 65 individual measurements of methane emissions from 24 oil and gas facilities across California. Methane emission rates were estimated using in situ methane and wind velocity measurements from a small aircraft by a novel Gauss' Theorem flux integral approach. The estimates are compared with annual mean emissions reported to the U.S. Environmental Protection Agency (USEPA) and the California Air Resources Board (CARB) through their respective greenhouse gas reporting programs. The average emissions from 36 measurements of 10 gas storage facilities were within a factor of 2 of emissions reported to USEPA or CARB, though large variance was observed and the reporting database did not contain all of the facilities...
November 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28951909/stress-relaxation-in-viscous-soft-spheres
#7
Julia Boschan, Siddarth A Vasudevan, Pouyan E Boukany, Ellák Somfai, Brian P Tighe
We report the results of molecular dynamics simulations of stress relaxation tests in athermal viscous soft sphere packings close to their unjamming transition. By systematically and simultaneously varying both the amplitude of the applied strain step and the pressure of the initial condition, we access both linear and nonlinear response regimes and control the distance to jamming. Stress relaxation in viscoelastic solids is characterized by a relaxation time τ* that separates short time scales, where viscous loss is substantial, from long time scales, where elastic storage dominates and the response is essentially quasistatic...
October 4, 2017: Soft Matter
https://www.readbyqxmd.com/read/28950568/enthalpy-based-multiple-relaxation-time-lattice-boltzmann-method-for-solid-liquid-phase-change-heat-transfer-in-metal-foams
#8
Qing Liu, Ya-Ling He, Qing Li
In this paper, an enthalpy-based multiple-relaxation-time (MRT) lattice Boltzmann (LB) method is developed for solid-liquid phase-change heat transfer in metal foams under the local thermal nonequilibrium (LTNE) condition. The enthalpy-based MRT-LB method consists of three different MRT-LB models: one for flow field based on the generalized non-Darcy model, and the other two for phase-change material (PCM) and metal-foam temperature fields described by the LTNE model. The moving solid-liquid phase interface is implicitly tracked through the liquid fraction, which is simultaneously obtained when the energy equations of PCM and metal foam are solved...
August 2017: Physical Review. E
https://www.readbyqxmd.com/read/28949274/determination-of-the-time-course-of-caloric-nystagmus-in-patients-with-spinocerebellar-degeneration-using-caloric-step-stimulus-procedure
#9
Takamori Takeda, Ayane Makabe, Chiaki Hirai, Takeshi Tsutsumi
CONCLUSIONS: The step stimulus procedure can provide information on the time course of the vestibulo-ocular reflex. Spinocerebellar degeneration and aging seem to shorten the time constant of the onset of the vestibulo-ocular reflex, causing a rapid rise up. Failure of the central processing of velocity storage might contribute to this rapid rise up. OBJECTIVES: The aim of this study is to evaluate the time course characteristics of the vestibulo-ocular reflex in patients with spinocerebellar degeneration...
September 26, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28941360/the-study-on-six-green-insensitive-high-energetic-coordination-polymers-based-on-alkali-alkali-earth-metals-and-4-5-bis-tetrazol-5-yl-2h-1-2-3-triazole
#10
Dong Chen, Dong Jing, Qi Zhang, Xianggui Xue, Shaohua Gou, Hongzhen Li, Fude Nie
Constructing insensitive high-performance ECPs with alkali/alkali-earth metal ions and nitrogen-rich organic backbone has been proved a feasible strategy in this work. Six diverse dimensional novel ECPs (Compounds 1-6) were successfully synthesized from Na(I), Cs(I), Ca(II), Sr(II), Ba(II) ions and a nitrogen-rich triheterocyclic 4,5-Bis(tetrazol-5-yl)-2H-1,2,3-triazole (H3BTT). All compounds show outstanding stability and low sensitivity, the thermal stability of these ECPs are significantly improved as the structural reinforcement increased from 1D to 3D, in which the decomposition temperature of 3D Ba(II) based compound 6 is as high as 397 oC...
September 23, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28937829/nonlinearity-coherence-and-complexity-biophysical-aspects-related-to-health-and-disease
#11
Alberto Foletti, Larissa Brizhik
Biological organisms are complex open dissipative systems whose dynamical stability is sustained due to the exchange of matter, energy and information. Dynamical stability occurs through a number of mechanisms that sustain efficient adaptive dynamics. Such properties of living matter can be the consequence of a self-consistent state of matter and electromagnetic field (EMF). Based on the soliton model of charge transport in redox processes, we describe a possible mechanism of the origin of endogenous EMF and coherence...
September 22, 2017: Electromagnetic Biology and Medicine
https://www.readbyqxmd.com/read/28924261/a-chip-integrated-coherent-photonic-phononic-memory
#12
Moritz Merklein, Birgit Stiller, Khu Vu, Stephen J Madden, Benjamin J Eggleton
Controlling and manipulating quanta of coherent acoustic vibrations-phonons-in integrated circuits has recently drawn a lot of attention, since phonons can function as unique links between radiofrequency and optical signals, allow access to quantum regimes and offer advanced signal processing capabilities. Recent approaches based on optomechanical resonators have achieved impressive quality factors allowing for storage of optical signals. However, so far these techniques have been limited in bandwidth and are incompatible with multi-wavelength operation...
September 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28917180/learning-from-the-operation-pathology-and-maintenance-of-a-bioretention-system-to-optimize-urban-drainage-practices
#13
Marina Batalini de Macedo, Altair Rosa, César Ambrogi Ferreira do Lago, Eduardo Mario Mendiondo, Vladimir Caramori Borges de Souza
LID practices for runoff control are increasingly being used as an integrated solution in urban drainage, helping to achieve hydrological balance close to the pre-urbanized period and decrease the diffuse pollution transported to urban rivers. Regarding bioretention, there is already broad knowledge about the detention of peak flows and their treatment capacity for many pollutants. However, there are still few field studies in microdrainage scale, which analyze the actual operation of these devices and raise common problems found, especially in subtropical climate...
December 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28888187/effect-of-tank-diameter-on-thermal-behavior-of-gasoline-and-diesel-storage-tanks-fires
#14
Ricardo Machado Leite, Felipe Roman Centeno
Studies on fire behavior are extremely important as they contribute in a firefighting situation or even to avoid such hazard. Experimental studies of fire in real scale are unfeasible, implying that reduced-scale experiments must be performed, and results extrapolated to the range of interest. This research aims to experimentally study the fire behavior in tanks of 0.04m, 0.20m, 0.40m, 0.80m and 4.28m diameter, burning regular gasoline or diesel oil S-500. The following parameters were here obtained: burning rates, burning velocities, heat release rates, flame heights, and temperature distributions adjacent to the tank...
January 15, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28861030/coding-of-velocity-storage-in-the-vestibular-nuclei
#15
Sergei B Yakushin, Theodore Raphan, Bernard Cohen
Semicircular canal afferents sense angular acceleration and output angular velocity with a short time constant of ≈4.5 s. This output is prolonged by a central integrative network, velocity storage that lengthens the time constants of eye velocity. This mechanism utilizes canal, otolith, and visual (optokinetic) information to align the axis of eye velocity toward the spatial vertical when head orientation is off-vertical axis. Previous studies indicated that vestibular-only (VO) and vestibular-pause-saccade (VPS) neurons located in the medial and superior vestibular nucleus could code all aspects of velocity storage...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28846382/rates-of-co2-mineralization-in-geological-carbon-storage
#16
Shuo Zhang, Donald J DePaolo
Geologic carbon storage (GCS) involves capture and purification of CO2 at industrial emission sources, compression into a supercritical state, and subsequent injection into geologic formations. This process reverses the flow of carbon to the atmosphere with the intention of returning the carbon to long-term geologic storage. Models suggest that most of the injected CO2 will be "trapped" in the subsurface by physical means, but the most risk-free and permanent form of carbon storage is as carbonate minerals (Ca,Mg,Fe)CO3...
August 28, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28837611/rooibos-aspalathus-linearis-extract-enhances-boar-sperm-velocity-up-to-96-hours-of-semen-storage
#17
José Luis Ros-Santaella, Eliana Pintus
Rooibos (Aspalathus linearis) is a native shrub from South African fynbos and has become very popular in the last decades for its antioxidant and medicinal attributes. Several studies have shown its beneficial properties in numerous cell lines, but to date, the in vitro effects of rooibos extract on sperm cells are still unknown. In this study, boar semen was supplemented with four concentrations both of fermented and unfermented rooibos extracts during 96 h of liquid storage at 17°C. The effects of rooibos extracts on sperm velocity, membrane integrity, and acrosomal status were evaluated at 2 h, 48 h, and 96 h of semen storage...
2017: PloS One
https://www.readbyqxmd.com/read/28836427/embedded-triboelectric-active-sensors-for-real-time-pneumatic-monitoring
#18
Xian Peng Fu, Tian Zhao Bu, Feng Ben Xi, Ting Hai Cheng, Chi Zhang, Zhong Lin Wang
Pneumatic monitoring sensors have great demands for power supply in cylinder systems. Here, we present an embedded sliding triboelectric nanogenerator (TENG) in air cylinder as active sensors for position and velocity monitoring. The embedded TENG is composed of a circular poly(tetrafluoroethylene) polymer and a triangular copper electrode. The working mechanism as triboelectric active sensors and electric output performance are systematically investigated. By integrating into the pneumatic system, the embedded triboelectric active sensors have been used for real-time air pressure/flow monitoring and energy storage...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28827457/take-off-mechanisms-in-parasitoid-wasps
#19
Malcolm Burrows, Marina Dorosenko
High-speed video analyses of the natural behaviour of parasitoid wasps revealed three strategies used to launch the insects into the air. Which strategy is the most energy efficient? In Pteromalus puparum, 92% of take-offs by were propelled entirely by movements of the middle and hind legs, which were depressed at their coxo-trochanteral and extended at their femoro-tibial joints. The front legs left the ground first, followed by the hind legs, so that the middle legs provided the final propulsion. Second, in other species of a similar mass, Cotesia glomerata and Leptopilina boulardi, all take-offs were propelled by a mean of 2...
October 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28825820/fate-of-a-stressed-therapeutic-antibody-tracked-by-fluorescence-correlation-spectroscopy-folded-monomers-survive-aggregation
#20
Hiroshi Imamura, Akira Sasaki, Shinya Honda
Antibodies are therapeutic proteins that are becoming indispensable for the treatment of serious diseases. Their efficacies depend on their folded structures, the loss of which, through unfolding or aggregation, should be closely monitored during their manufacture, storage, and dosing for safe usage. In downstream processes, exposure of the crude antibody solution to acid, followed by neutralization, is an established standard protocol for antibody purification and inactivation of viruses in antibody preparations...
August 21, 2017: Journal of Physical Chemistry. B
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