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https://www.readbyqxmd.com/read/29346532/what-color-should-glacier-algae-be
#1
Roman J Dial, Gerard Q Ganey, S McKenzie Skiles
Red-colored secondary pigments in glacier algae play an adaptive role in melting snow and ice. We advance this hypothesis using a model of color-based absorption of irradiance, an experiment with colored particles in snow, and the natural history of glacier algae. Carotenoids and phenols-astaxanthin in snow-algae and purpurogallin in ice-algae-shield photosynthetic apparatus by absorbing over-abundant visible wavelengths, then dissipating the excess radiant energy as heat. This heat melts proximal ice crystals, providing liquid-water in a 0°C environment and freeing-up nutrients bound in frozen water...
January 15, 2018: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/29345986/vital-signs-seismology-of-icy-ocean-worlds
#2
Steven D Vance, Sharon Kedar, Mark P Panning, Simon C Stähler, Bruce G Bills, Ralph D Lorenz, Hsin-Hua Huang, W T Pike, Julie C Castillo, Philippe Lognonné, Victor C Tsai, Alyssa R Rhoden
Ice-covered ocean worlds possess diverse energy sources and associated mechanisms that are capable of driving significant seismic activity, but to date no measurements of their seismic activity have been obtained. Such investigations could reveal the transport properties and radial structures, with possibilities for locating and characterizing trapped liquids that may host life and yielding critical constraints on redox fluxes and thus on habitability. Modeling efforts have examined seismic sources from tectonic fracturing and impacts...
January 2018: Astrobiology
https://www.readbyqxmd.com/read/29345899/three-dimensional-graphene-foam-polymer-composite-with-superior-deicing-efficiency-and-strength
#3
Jenniffer Bustillos, Cheng Zhang, Benjamin Boesl, Arvind Agarwal
The adhesion of ice severely compromises the aerodynamic performance of aircrafts operating under critically low-temperature conditions to their surfaces. In this study, highly thermally and electrically conductive graphene foam polymer composite is fabricated. GrF - polydimethylsiloxane (PDMS) deicing composite exhibit superior deicing efficiency of 477 % and electrical conductivities of 500 S∙m-1 with only 0.1 vol. % Graphene foam addition as compared to other nanocarbon - based deicing systems. The three-dimensional interconnected architecture of GrF allows the effective deicing of surfaces by employing low power densities (0...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29344776/dawning-of-a-new-era-in-trp-channel-structural-biology-by-cryo-electron-microscopy
#4
REVIEW
M Gregor Madej, Christine M Ziegler
Cryo-electron microscopy (cryo-EM) permits the determination of atomic protein structures by averaging large numbers of individual projection images recorded at cryogenic temperatures-a method termed single-particle analysis. The cryo-preservation traps proteins within a thin glass-like ice layer, making literally a freeze image of proteins in solution. Projections of randomly adopted orientations are merged to reconstruct a 3D density map. While atomic resolution for highly symmetric viruses was achieved already in 2009, the development of new sensitive and fast electron detectors has enabled cryo-EM for smaller and asymmetrical proteins including fragile membrane proteins...
January 17, 2018: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/29343713/atmospheric-co2-effect-on-stable-carbon-isotope-composition-of-terrestrial-fossil-archives
#5
Vincent J Hare, Emma Loftus, Amy Jeffrey, Christopher Bronk Ramsey
The 13C/12C ratio of C3 plant matter is thought to be controlled by the isotopic composition of atmospheric CO2 and stomatal response to environmental conditions, particularly mean annual precipitation (MAP). The effect of CO2 concentration on 13C/12C ratios is currently debated, yet crucial to reconstructing ancient environments and quantifying the carbon cycle. Here we compare high-resolution ice core measurements of atmospheric CO2 with fossil plant and faunal isotope records. We show the effect of pCO2 during the last deglaciation is stronger for gymnosperms (-1...
January 17, 2018: Nature Communications
https://www.readbyqxmd.com/read/29343558/postcranial-diversity-and-recent-ecomorphic-impoverishment-of-north-american-gray-wolves
#6
Susumu Tomiya, Julie A Meachen
Recent advances in genomics and palaeontology have begun to unravel the complex evolutionary history of the gray wolf, Canis lupus Still, much of their phenotypic variation across time and space remains to be documented. We examined the limb morphology of the fossil and modern North American gray wolves from the late Quaternary (<ca 70 ka) to better understand their postcranial diversity through time. We found that the late-Pleistocene gray wolves were characterized by short-leggedness on both sides of the Cordilleran-Laurentide ice sheets, and that this trait survived well into the Holocene despite the collapse of Pleistocene megafauna and disappearance of the 'Beringian wolf' from Alaska...
January 2018: Biology Letters
https://www.readbyqxmd.com/read/29342945/hyperspectral-features-of-oil-polluted-sea-ice-and-the-response-to-the-contamination-area-fraction
#7
Bingxin Liu, Ying Li, Chengyu Liu, Feng Xie, Jan-Peter Muller
Researchers have studied oil spills in open waters using remote sensors, but few have focused on extracting reflectance features of oil pollution on sea ice. An experiment was conducted on natural sea ice in Bohai Bay, China, to obtain the spectral reflectance of oil-contaminated sea ice. The spectral absorption index (SAI), spectral peak height (SPH), and wavelet detail coefficient (DWT d5) were calculated using stepwise multiple linear regression. The reflectances of some false targets were measured and analysed...
January 15, 2018: Sensors
https://www.readbyqxmd.com/read/29342463/sensation-of-cold-during-the-ice-water-test-corresponds-to-the-perception-of-pain-during-botulinum-toxin-bladder-wall-injections
#8
André Reitz, Tanja Hüsch, Regula Doggweiler, Stephan Buse, Axel Haferkamp
AIMS: To investigate the association of bladder cold sensation (BCS) during the ice water test (IWT) and pain perception when botulinum toxin injections (BTI) are administered into the bladder wall. MATERIAL AND METHODS: In 86 patients with idiopathic overactive bladder, the BCS during the IWT was investigated. Patients were divided into 2 groups: with and without BCS. During subsequent administration of BTI, the number of perceived and painful injections as well as the pain levels on a 0-100 pain scale were compared in both groups using Student t test...
January 18, 2018: Urologia Internationalis
https://www.readbyqxmd.com/read/29342444/scarlet-fever-epidemic-in-china-caused-by-streptococcus-pyogenes-serotype-m12-epidemiologic-and-molecular-analysis
#9
Yuanhai You, Mark R Davies, Melinda Protani, Liam McIntyre, Mark J Walker, Jianzhong Zhang
From 2011, Hong Kong and mainland China have witnessed a sharp increase in reported cases, with subsequent reports of epidemic scarlet fever in North Asia and the United Kingdom. Here we examine epidemiological data and investigate the genomic context of the predominantly serotype M12 Streptococcus pyogenes scarlet fever isolates from mainland China. Incident case data was obtained from the Chinese Nationwide Notifiable Infectious Diseases Reporting Information System. The relative risk of scarlet fever in recent outbreak years 2011-2016 was calculated using the median age-standardised incidence rate, compared to years 2003-2010 prior this outbreak...
January 11, 2018: EBioMedicine
https://www.readbyqxmd.com/read/29342155/nanoscopic-x-ray-fluorescence-imaging-and-quantification-of-intracellular-key-elements-in-cryofrozen-friedreich-s-ataxia-fibroblasts
#10
Björn De Samber, Eline Meul, Brecht Laforce, Boel De Paepe, Joél Smet, Michiel De Bruyne, Riet De Rycke, Sylvain Bohic, Peter Cloetens, Rudy Van Coster, Peter Vandenabeele, Tom Vanden Berghe
Synchrotron radiation based nanoscopic X-ray fluorescence (SR nano-XRF) analysis can visualize trace level elemental distribution in a fully quantitative manner within single cells. However, in-air XRF analysis requires chemical fixation modifying the cell's chemical composition. Here, we describe first nanoscopic XRF analysis upon cryogenically frozen (-150°C) fibroblasts at the ID16A-NI 'Nano-imaging' end-station located at the European Synchrotron Radiation Facility (ESRF) in Grenoble (France). Fibroblast cells were obtained from skin biopsies from control and Friedreich's ataxia (FRDA) patients...
2018: PloS One
https://www.readbyqxmd.com/read/29342109/sources-of-added-sugars-in-young-children-adolescents-and-adults-with-low-and-high-intakes-of-added-sugars
#11
Regan L Bailey, Victor L Fulgoni, Alexandra E Cowan, P Courtney Gaine
High intake of added sugars is associated with excess energy intake and poorer diet quality. The objective of this cross-sectional study (n = 16,806) was to estimate usual intakes and the primary food sources of added sugars across the range of intakes (i.e., deciles) among U.S. children (2-8 years), adolescents and teens (9-18 years), and adults (≥19 years) using the National Health and Nutrition Examination (NHANES) data from 2009-2012. The percent energy contributed by added sugars was 14.3 ± 0.2% (2-8 years), 16...
January 17, 2018: Nutrients
https://www.readbyqxmd.com/read/29341714/kinetically-controlled-two-step-amorphization-and-amorphous-amorphous-transition-in-ice
#12
Chuanlong Lin, Xue Yong, John S Tse, Jesse S Smith, Stanislav V Sinogeikin, Curtis Kenney-Benson, Guoyin Shen
We report the results of in situ structural characterization of the amorphization of crystalline ice Ih under compression and the relaxation of high-density amorphous (HDA) ice under decompression at temperatures between 96 and 160 K by synchrotron x-ray diffraction. The results show that ice Ih transforms to an intermediate crystalline phase at 100 K prior to complete amorphization, which is supported by molecular dynamics calculations. The phase transition pathways show clear temperature dependence: direct amorphization without an intermediate phase is observed at 133 K, while at 145 K a direct Ih-to-IX transformation is observed; decompression of HDA shows a transition to low-density amorphous ice at 96 K and ∼1  Pa, to ice Ic at 135 K and to ice IX at 145 K...
September 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341697/large-scale-structure-and-hyperuniformity-of-amorphous-ices
#13
Fausto Martelli, Salvatore Torquato, Nicolas Giovambattista, Roberto Car
We investigate the large-scale structure of amorphous ices and transitions between their different forms by quantifying their large-scale density fluctuations. Specifically, we simulate the isothermal compression of low-density amorphous ice (LDA) and hexagonal ice to produce high-density amorphous ice (HDA). Both HDA and LDA are nearly hyperuniform; i.e., they are characterized by an anomalous suppression of large-scale density fluctuations. By contrast, in correspondence with the nonequilibrium phase transitions to HDA, the presence of structural heterogeneities strongly suppresses the hyperuniformity and the system becomes hyposurficial (devoid of "surface-area fluctuations")...
September 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341676/excess-hydrogen-bond-at-the-ice-vapor-interface-around-200%C3%A2-k
#14
Wilbert J Smit, Fujie Tang, M Alejandra Sánchez, Ellen H G Backus, Limei Xu, Taisuke Hasegawa, Mischa Bonn, Huib J Bakker, Yuki Nagata
Phase-resolved sum-frequency generation measurements combined with molecular dynamics simulations are employed to study the effect of temperature on the molecular arrangement of water on the basal face of ice. The topmost monolayer, interrogated through its nonhydrogen-bonded, free O-H stretch peak, exhibits a maximum in surface H-bond density around 200 K. This maximum results from two competing effects: above 200 K, thermal fluctuations cause the breaking of H bonds; below 200 K, the formation of bulklike crystalline interfacial structures leads to H-bond breaking...
September 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29340161/direct-ice-imaging-from-inside-the-left-atrial-appendage-during-ablation-of-persistent-atrial-fibrillation
#15
Gabriel Cismaru, Mihai Puiu, Radu Rosu, Lucian Muresan, Gabriel Gusetu, Dana Pop, Dumitru Zdrenghea
We present the case of a 59-year-old patient with persistent atrial fibrillation, referred for atrial fibrillation ablation. The procedure was performed with the help of NAVX 3D mapping system (Saint Jude Medical) and iLAB Ultra ICE Plus ultrasound imaging catheter (Boston Scientific). The catheter permits cross-sectional images perpendicular to catheter's long axis. From inside left atrial appendage (LAA) looks trabeculated, due to pectinate muscles running parallel to each other. The presence of a thrombus was excluded from the appendage...
January 2018: Oxford Medical Case Reports
https://www.readbyqxmd.com/read/29339731/electron-affinity-of-liquid-water
#16
Alex P Gaiduk, Tuan Anh Pham, Marco Govoni, Francesco Paesani, Giulia Galli
Understanding redox and photochemical reactions in aqueous environments requires a precise knowledge of the ionization potential and electron affinity of liquid water. The former has been measured, but not the latter. We predict the electron affinity of liquid water and of its surface from first principles, coupling path-integral molecular dynamics with ab initio potentials, and many-body perturbation theory. Our results for the surface (0.8 eV) agree well with recent pump-probe spectroscopy measurements on amorphous ice...
January 16, 2018: Nature Communications
https://www.readbyqxmd.com/read/29339638/a-nomogram-to-characterize-the-severity-of-detrusor-overactivity-during-the-ice-water-test-description-of-the-method-and-proof-of-concept
#17
André Reitz, Tanja Hüsch, Axel Haferkamp
AIMS: To develop a nomogram with severity categories for detrusor overactivity (DO). METHODS: By conducting ice water tests (IWT) in 55 patients with Parkinson's disease, we identified criteria to describe characteristics of the detrusor pressure curves: (1) a gradient of Δpdet over Δt at the maximum detrusor pressure and (2) the area under the curve. In a nomogram, 10 severity categories of DO were established: 1 and 2 were assigned to group A (mild), 3 and 4 to group B (moderate) and 5-10 to group C (severe)...
January 16, 2018: Urologia Internationalis
https://www.readbyqxmd.com/read/29339335/potential-impacts-of-offshore-oil-spills-on-polar-bears-in-the-chukchi-sea
#18
Ryan R Wilson, Craig Perham, Deborah P French-McCay, Richard Balouskus
Sea ice decline is anticipated to increase human access to the Arctic Ocean allowing for offshore oil and gas development in once inaccessible areas. Given the potential negative consequences of an oil spill on marine wildlife populations in the Arctic, it is important to understand the magnitude of impact a large spill could have on wildlife to inform response planning efforts. In this study we simulated oil spills that released 25,000 barrels of oil for 30 days in autumn originating from two sites in the Chukchi Sea (one in Russia and one in the U...
January 12, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29338683/genomic-repeats-misassembly-and-reannotation-a-case-study-with-long-read-resequencing-of-porphyromonas-gingivalis-reference-strains
#19
Luis Acuña-Amador, Aline Primot, Edouard Cadieu, Alain Roulet, Frédérique Barloy-Hubler
BACKGROUND: Without knowledge of their genomic sequences, it is impossible to make functional models of the bacteria that make up human and animal microbiota. Unfortunately, the vast majority of publicly available genomes are only working drafts, an incompleteness that causes numerous problems and constitutes a major obstacle to genotypic and phenotypic interpretation. In this work, we began with an example from the class Bacteroidia in the phylum Bacteroidetes, which is preponderant among human orodigestive microbiota...
January 16, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29337008/ice-pack-induced-perineal-analgesia-after-spontaneous-vaginal-birth-randomized-controlled-trial
#20
Adriana Amorim Francisco, Sonia Maria Junqueira Vasconcellos De Oliveira, Mary Steen, Moacyr Roberto Cuce Nobre, Eder Viana De Souza
BACKGROUND: Ice-pack is widely used for alleviating postpartum perineal pain sustained after birth related perineal trauma. However, it lacks robust evidence on timing and frequency of applications, to ensure the effective and safe use of this therapy. AIMS: To evaluate if a 10min ice-pack application relieved postpartum perineal pain and if the analgesic effect was maintained for up to 2h. METHODS: A randomised controlled trial conducted from December 2012 to February 2013 with 69 primiparous women ≥18 years old, 6-24h postpartum, with perineal pain ≥3, who had not received anti-inflammatory medication or analgesics after childbirth, who were randomised to a single ice-pack application on the perineum for 10min or standard care...
January 11, 2018: Women and Birth: Journal of the Australian College of Midwives
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