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https://www.readbyqxmd.com/read/28817771/ice-templated-and-cross-linked-amyloid-fibril-aerogel-scaffolds-for-cell-growth
#1
Gustav Nyström, Wye-Khay Fong, Raffaele Mezzenga
Amyloid fibrils prepared from β-lactoglobulin were used to form freeze-dried and cross-linked aerogels. By varying the fibril concentration and freezing gradient, it was possible to control the pore structure and elastic modulus of the aerogels over one order of magnitude from ~2 to ~200 kPa. Using butane tetracarboxylic acid as cross-linker these aerogels maintained their monolithic shape in aqueous conditions displaying elastic behavior and a modulus in the range of 4-40 kPa. When explored as scaffolds for cell growth, the amyloid fibril aerogels demonstrated biocompatibility and led to the successful penetration and permeation of two epithelial cell lines (Caco-2 and HT29) throughout the scaffold...
August 17, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28817681/pressure-in-isochoric-systems-containing-aqueous-solutions-at-subzero-centigrade-temperatures
#2
Gideon Ukpai, Gabriel Năstase, Alexandru Șerban, Boris Rubinsky
OBJECTIVE: Preservation of biological materials at subzero Centigrade temperatures, cryopreservation, is important for the field of tissue engineering and organ transplantation. Our group is studying the use of isochoric (constant volume) systems of aqueous solution for cryopreservation. Previous studies measured the pressure-temperature relations in aqueous isochoric systems in the temperature range from 0°C to - 20°C. The goal of this study is to expand the pressure-temperature measurement beyond the range reported in previous publications...
2017: PloS One
https://www.readbyqxmd.com/read/28816668/fast-open-world-person-re-identification
#3
Xiatian Zhu, Botong Wu, Dongcheng Huang, Wei-Shi Zheng
Existing person re-identification (re-id) methods typically assume that (1) any probe person is guaranteed to appear in the gallery target population during deployment (i.e. closed-world), and (2) the probe set contains only a limited number of people (i.e. small search scale). Both assumptions are artificial and breached in real-world applications, since the probe population in target people search can be extremely vast in practice due to the ambiguity of probe search space boundary. Therefore, it is unrealistic that any probe person is assumed as one target people, and a large-scale search in person images is inherently demanded...
August 16, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28816521/plume-activity-and-tidal-deformation-on-enceladus-influenced-by-faults-and-variable-ice-shell-thickness
#4
Marie Běhounková, Ondřej Souček, Jaroslav Hron, Ondřej Čadek
We investigated the effect of variations in ice shell thickness and of the tiger stripe fractures crossing Enceladus' south polar terrain on the moon's tidal deformation by performing finite element calculations in three-dimensional geometry. The combination of thinning in the polar region and the presence of faults has a synergistic effect that leads to an increase of both the displacement and stress in the south polar terrain by an order of magnitude compared to that of the traditional model with a uniform shell thickness and without faults...
August 17, 2017: Astrobiology
https://www.readbyqxmd.com/read/28816440/high-quantities-of-microplastic-in-arctic-deep-sea-sediments-from-the-hausgarten-observatory
#5
Melanie Bergmann, Vanessa Wirzberger, Thomas Krumpen, Claudia Lorenz, Sebastian Primpke, Mine B Tekman, Gunnar Gerdts
Although mounting evidence suggests the ubiquity of microplastic in aquatic ecosystems worldwide, our knowledge of its distribution in remote environments such as Polar Regions and the deep sea is scarce. Here, we analyzed nine sediment samples taken at the HAUSGARTEN observatory in the Arctic at 2,340 - 5,570 m depth. Density separation by MicroPlastic Sediment Separator and treatment with Fenton's reagent enabled analysis via Attenuated Total Reflection FTIR and µFTIR spectroscopy. Our analyses indicate the wide spread of high numbers of microplastics (42 - 6,595 microplastics kg-1)...
August 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28816288/-recombinant-human-transforming-growth-factor-%C3%AE-1-promotes-dental-pulp-stem-cells-proliferation-and-mineralization
#6
W Q Jia, Y M Zhao, L H Ge
OBJECTIVE: To explore suitable concentration of recombinant human transforming growth factor β1 (rhTGF-β1) usage and study the effect of rhTGF-β1 on differentiation of dental pulp stem cells (DPSCs). METHODS: DPSCs were isolated from the undiseased third molars of people aged 18-25 years and cultured according to instructions in vitro. Different concentrations (1 , 6 , 10 μg/L) of rhTGF-β1 were added to the culture medium to examine DPSCs proliferation by CCK-8 (cell counting kit-8) assay...
August 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28814806/enhanced-wintertime-greenhouse-effect-reinforcing-arctic-amplification-and-initial-sea-ice-melting
#7
Yunfeng Cao, Shunlin Liang, Xiaona Chen, Tao He, Dongdong Wang, Xiao Cheng
The speeds of both Arctic surface warming and sea-ice shrinking have accelerated over recent decades. However, the causes of this unprecedented phenomenon remain unclear and are subjects of considerable debate. In this study, we report strong observational evidence, for the first time from long-term (1984-2014) spatially complete satellite records, that increased cloudiness and atmospheric water vapor in winter and spring have caused an extraordinary downward longwave radiative flux to the ice surface, which may then amplify the Arctic wintertime ice-surface warming...
August 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28812348/inhibition-of-heterogeneous-ice-nucleation-by-bioinspired-coatings-of-polyampholytes
#8
Zhiyuan He, Liuchun Zheng, Zhenqi Liu, Shenglin Jin, Chuncheng Li, Jianjun Wang
Controlling of heterogeneous ice nucleation (HIN) on foreign surfaces is of great importance for anti-ice nucleation material design. In this work, we studied the HIN behaviors on various ion-modified poly(butylene succinate) (PBS) surfaces via chain-extension reaction. Inspired by antifreeze proteins (AFPs), the PBS-based polyampholytes, containing both negative and positive charge groups on a single chain, show excellent performance of ice nucleation inhibition and freezing delay. Unlike the extremely high price and low availability of AFPs, these PBS-based polyampholytes can be commercially synthesized under mild reaction conditions...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812036/incidence-of-sports-related-concussion-among-ncaa-women-s-ice-hockey-athletes
#9
Emily M Brook, Emily Kroshus, Caroline H Hu, Marissa Gedman, Jamie E Collins, Elizabeth G Matzkin
BACKGROUND: There are limited data on the incidence of concussion and concussion symptom nondisclosure among collegiate women's ice hockey athletes. PURPOSE: To determine the incidence of sports-related concussion (SRC) in National Collegiate Athletic Association (NCAA) women's ice hockey athletes. STUDY DESIGN: Descriptive epidemiology study. METHODS: An anonymous online survey was completed by 459 NCAA women's ice hockey athletes...
July 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28811644/the-link-between-enso-like-forcing-and-hydroclimate-variability-of-coastal-east-asia-during-the-last-millennium
#10
Jungjae Park, Jiwoo Han, Qiuhong Jin, Junbeom Bahk, Sangheon Yi
Inconsistent reconstructions of East Asian hydroclimate for the last millennium significantly limit our understanding of the mechanisms behind climate variability during the medieval climate anomaly (MCA) and little ice age (LIA) in the region. In this study, we present new high-resolution multiproxy records (diatom, δ(13)C, C/N, TS) from the Mulyoungari swamp, Jeju Island, South Korea. Our results indicate that El Niño southern oscillation-like variations caused the dry MCA/wet LIA pattern in the study area...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811530/evidence-for-ice-ocean-albedo-feedback-in-the-arctic-ocean-shifting-to-a-seasonal-ice-zone
#11
Haruhiko Kashiwase, Kay I Ohshima, Sohey Nihashi, Hajo Eicken
Ice-albedo feedback due to the albedo contrast between water and ice is a major factor in seasonal sea ice retreat, and has received increasing attention with the Arctic Ocean shifting to a seasonal ice cover. However, quantitative evaluation of such feedbacks is still insufficient. Here we provide quantitative evidence that heat input through the open water fraction is the primary driver of seasonal and interannual variations in Arctic sea ice retreat. Analyses of satellite data (1979-2014) and a simplified ice-upper ocean coupled model reveal that divergent ice motion in the early melt season triggers large-scale feedback which subsequently amplifies summer sea ice anomalies...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811497/vertical-ocean-heat-redistribution-sustaining-sea-ice-concentration-trends-in-the-ross-sea
#12
Olivier Lecomte, Hugues Goosse, Thierry Fichefet, Casimir de Lavergne, Antoine Barthélemy, Violette Zunz
Several processes have been hypothesized to explain the slight overall expansion of Antarctic sea ice over the satellite observation era, including externally forced changes in local winds or in the Southern Ocean's hydrological cycle, as well as internal climate variability. Here, we show the critical influence of an ocean-sea-ice feedback. Once initiated by an external perturbation, it may be sufficient to sustain the observed sea-ice expansion in the Ross Sea, the region with the largest and most significant expansion...
August 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28811190/how-to-quench-your-thirst-the-effect-of-water-based-products-varying-in-temperature-and-texture-flavour-and-sugar-content-on-thirst
#13
L van Belzen, E M Postma, S Boesveldt
The sensation of thirst plays an important role in the consumption of water or other fluids to rehydrate the body in order to keep bodily functions working properly. An increase in saliva secretion, wetting the mouth by ingestion of liquids, and cooling and sour components in products can alleviate this sensation already before absorption of fluids by the body. This study aimed to investigate the thirst-quenching ability of water-based products differing in temperature and texture (cold solids and cool liquids), flavour (flavoured and non-flavoured) and sugar content in two consecutive experiments...
August 12, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28811148/metagenomes-from-deep-baltic-sea-sediments-reveal-how-past-and-present-environmental-conditions-determine-microbial-community-composition
#14
Ian P G Marshall, Søren M Karst, Per H Nielsen, Bo Barker Jørgensen
Microbial communities that lived near the sediment surface in the past become slowly buried and are the source of deep subsurface communities thousands of years later. We used metagenomes to analyse how the composition of buried microbial communities may change to conform to altered environmental conditions at depth. Sediment samples were collected from down to 85m below sea floor during the Integrated Ocean Drilling Program Expedition 347, "Baltic Sea Paleoenvironment". The sediments vary in age, organic carbon content, porewater salinity, and other parameters that reflect the changing Baltic environment from the last ice age and throughout the Holocene...
August 12, 2017: Marine Genomics
https://www.readbyqxmd.com/read/28810774/effect-of-solute-nature-on-the-polyamorphic-transition-in-glassy-polyol-aqueous-solutions
#15
Yoshiharu Suzuki
I examined the polyamorphic behavior of glassy dilute aqueous solutions of polyols (ethylene glycol, glycerol, meso-erythritol, xylitol, and D-sorbitol) under pressure at low temperatures. Although the volume change of the glassy aqueous solution varied continuously against pressure, the rate of the volume change appeared to vary discontinuously at the onset pressure of the gradual polyamorphic transition. It is thought that low-density liquid-like solvent water and high-density liquid-like solvent water coexist during the transition...
August 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28808854/assessing-landscape-and-contaminant-point-sources-as-spatial-determinants-of-water-quality-in-the-vermilion-river-system-ontario-canada
#16
Carrie Strangway, Michelle F Bowman, Andrea E Kirkwood
The Vermilion River and major tributaries (VRMT) are located in the Vermilion watershed (4272 km(2)) in north-central Ontario, Canada. This watershed not only is dominated by natural land-cover but also has a legacy of mining and other development activities. The VRMT receive various point (e.g., sewage effluent) and non-point (e.g., mining activity runoff) inputs, in addition to flow regulation features. Further development in the Vermilion watershed has been proposed, raising concerns about cumulative impacts to ecosystem health in the VRMT...
August 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28808685/structure-of-a-1-5-mda-adhesin-that-binds-its-antarctic-bacterium-to-diatoms-and-ice
#17
Shuaiqi Guo, Corey A Stevens, Tyler D R Vance, Luuk L C Olijve, Laurie A Graham, Robert L Campbell, Saeed R Yazdi, Carlos Escobedo, Maya Bar-Dolev, Victor Yashunsky, Ido Braslavsky, David N Langelaan, Steven P Smith, John S Allingham, Ilja K Voets, Peter L Davies
Bacterial adhesins are modular cell-surface proteins that mediate adherence to other cells, surfaces, and ligands. The Antarctic bacterium Marinomonas primoryensis uses a 1.5-MDa adhesin comprising over 130 domains to position it on ice at the top of the water column for better access to oxygen and nutrients. We have reconstructed this 0.6-μm-long adhesin using a "dissect and build" structural biology approach and have established complementary roles for its five distinct regions. Domains in region I (RI) tether the adhesin to the type I secretion machinery in the periplasm of the bacterium and pass it through the outer membrane...
August 2017: Science Advances
https://www.readbyqxmd.com/read/28805338/direct-and-indirect-effects-of-episodic-frost-on-plant-growth-and-reproduction-in-subalpine-wildflowers
#18
Gabriella L Pardee, David W Inouye, Rebecca E Irwin
Frost is an important episodic event that damages plant tissues through the formation of ice crystals at or below freezing temperatures. In montane regions, where climate change is expected to cause earlier snowmelt but may not change the last frost-free day of the year, plants that bud earlier might be directly impacted by frost through damage to flower buds and reproductive structures. However, the indirect effects of frost mediated through changes in plant-pollinator interactions have rarely been explored...
August 14, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28805256/effects-of-euthanasia-methods-on-stable-carbon-%C3%AE-13-c-value-and-nitrogen-%C3%AE-15-n-value-isotopic-composition-of-fry-and-juvenile-rainbow-trout-oncorhynchus-mykiss
#19
Sarah Nahon, Sarah Séité, Joanna Kolasinski, Pierre Aguirre, Inge Geurden
RATIONALE: Carbon and nitrogen stable isotope analyses of fish tissues are now commonly used in ecological studies but mostly require the sacrifice of the animal. Ethical considerations recommend the use of anesthetics for tissue sampling. This study examines how anesthetics affect stable isotope ratios of fish compared with other euthanasia methods. METHODS: Rainbow trout fry and juveniles were sacrificed using ice-freezing (as this common method used to kill fish does not affect natural isotopic ratios), electronarcosis or an overdose of chemical anesthetics (2-phenoxyethanol, benzocaine and clove oil)...
August 14, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28805031/-ice-or-not-to-ice-during-laao-what-are-the-benefits-and-disadvantages-of-ice-during-laao
#20
EDITORIAL
Wassim Shatila, Zvonimir Krajcer
For left atrial appendage occlusion (LAAO), intracardiac echocardiography (ICE) could be a safe alternative to transesophageal echocardiography (TEE). ICE obviates the need for general anesthesia and can be readily implemented in practice. Randomized controlled trials are needed to assess the noninferiority of ICE to TEE for LAAO.
August 1, 2017: Catheterization and Cardiovascular Interventions
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