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https://www.readbyqxmd.com/read/28922643/vacuum-ultraviolet-photoabsorption-of-prime-ice-analogues-of-pluto-and-charon
#1
S Pavithraa, J-I Lo, K Rahul, B N Raja Sekhar, B-M Cheng, N J Mason, B Sivaraman
Here we present the first Vacuum UltraViolet (VUV) photoabsorption spectra of ice analogues of Pluto and Charon ice mixtures. For Pluto the ice analogue is an icy mixture containing nitrogen (N2), carbon monoxide (CO), methane (CH4) and water (H2O) prepared with a 100:1:1:3 ratio, respectively. Photoabsorption of icy mixtures with and without H2O were recorded and no significant changes in the spectra due to presence of H2O were observed. For Charon a VUV photoabsorption spectra of an ice analogue containing ammonia (NH3) and H2O prepared with a 1:1 ratio was recorded, a spectrum of ammonium hydroxide (NH4OH) was also recorded...
August 26, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28922601/substrate-dependence-of-the-freezing-dynamics-of-supercooled-water-films-a-high-speed-optical-microscope-study
#2
Elzbieta Pach, Laura Rodríguez, Albert Verdaguer
The freezing of supercooled water films on silicon-based surfaces was investigated using a high-speed camera coupled to an optical microscope. We were able to study in detail the two phases or stages in during water freezing; the first stage, faster, when dendritic grow occurs co-planar with the cold surface of the substrate and the second stage, slower, when the ice formed on the surface grows vertically until all the film is frozen. Several differentiated processes were identified during the freezing: two dimensional dendrite growing on the substrate interface, vertical dendrite growing, formation and evolution of ice domains, trapping of air bubbles in ice and freezing of the water film surface...
September 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28921398/preliminary-analysis-of-numerical-chromosome-abnormalities-in-reciprocal-and-robertsonian-translocation-preimplantation-genetic-diagnosis-cases-with-24-chromosomal-analysis-with-an-acgh-snp-microarray
#3
Yanxin Xie, Yanwen Xu, Jing Wang, Benyu Miao, Yanhong Zeng, Chenhui Ding, Jun Gao, Canquan Zhou
PURPOSE: The aim of this study was to determine whether an interchromosomal effect (ICE) occurred in embryos obtained from reciprocal translocation (rcp) and Robertsonian translocation (RT) carriers who were following a preimplantation genetic diagnosis (PGD) with whole chromosome screening with an aCGH and SNP microarray. We also analyzed the chromosomal numerical abnormalities in embryos with aneuploidy in parental chromosomes that were not involved with a translocation and balanced in involved parental translocation chromosomes...
September 18, 2017: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/28920835/erythrobacter-arachoides-sp-nov-isolated-from-ice-core
#4
Tingting Xing, Yongqin Liu, Ninglian Wang, Baiqing Xu, Keshao Liu, Liang Shen, Zhengquan Gu, Bixi Guo, Yuguang Zhou, Hongcan Liu
A Gram-stain-negative, rod-shaped bacterial strain, designed RC4-10-4T, belonging to the genus Erythrobacter, was isolated from the East Rongbuk Glacier on the Tibetan Plateau. Strain RC4-10-4T grew optimally at pH 7.0, at 25 °C and in the presence of 2 % (w/v) NaCl. Summed feature 3 (C16 : 1 ω6c and/or iso-C15 : 0 2-OH), summed feature 8 (C18 : 1 ω7c and/or C18 : 1 ω6c) and C16 : 0 were the major fatty acids. The major polar lipids were phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, sphingoglycolipid and phosphatidylcholine...
September 18, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28920689/a-320-year-ice-core-record-of-atmospheric-hg-pollution-in-the-altai-central-asia
#5
Stella Eyrikh, Anja Eichler, Leonhard Tobler, Natalia Malygina, Tatyana Papina, Margit Schwikowski
Anthropogenic emissions of the toxic heavy metal mercury (Hg) have substantially increased atmospheric Hg levels during the 20th century compared to pre-industrial times. However, on a regional scale, atmospheric Hg concentration or deposition trends vary to such an extent during the industrial period that the consequences of recent Asian emissions on atmospheric Hg levels are still unclear. Here we present a 320-year Hg deposition history for Central Asia, based on a continuous high-resolution ice-core Hg record from the Belukha glacier in the Siberian Altai, covering the time period 1680-2001...
September 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28919936/polar-applications-of-spaceborne-scatterometers
#6
David G Long
Wind scatterometers were originally developed for observation of near-surface winds over the ocean. They retrieve wind indirectly by measuring the normalized radar cross section (σ(o) ) of the surface, and estimating the wind via a geophysical model function relating σ(o) to the vector wind. The σ(o) measurements have proven to be remarkably capable in studies of the polar regions where they can map snow cover; detect the freeze/thaw state of forest, tundra, and ice; map and classify sea ice; and track icebergs...
May 2017: IEEE J Sel Top Appl Earth Obs Remote Sens
https://www.readbyqxmd.com/read/28919912/the-isfahan-comprehensive-elderly-study-objectives-research-design-methodology-and-preliminary-results
#7
Zahra Heidari, Awat Feizi
BACKGROUND: This paper presents the objectives, research design, methodology, and primary findings of the Isfahan Comprehensive Elderly Study (ICES). MATERIALS AND METHODS: In this cross-sectional study, 603 elderly persons (aged 60 and over) were selected by multistage cluster sampling method from Isfahan, Iran, in 2016 comprehensive questionnaires along with a detailed interview were used to collect information on personal, family, socioeconomic, health and social services characteristics, life styles, physical illnesses and chronic diseases, mental, emotional and cognition disorders, quality of life, disabilities, sleep quality, social supports, life satisfaction, self-efficacy, and of participants...
2017: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
https://www.readbyqxmd.com/read/28919185/epidemiology-of-cervical-spine-injuries-in-high-school-athletes-over-a-ten-year-period
#8
Adele Meron, Christopher McMullen, Scott R Laker, Dustin Currie, R Dawn Comstock
BACKGROUND: Over 7 million athletes participate in high school (HS) sports annually, with both the benefits of physical activity and risks of injury. While catastrophic cervical spine injuries have been studied, limited data are available characterizing less severe cervical spine injuries in HS athletes. OBJECTIVE: To describe and compare cervical spine injury rates and patterns among United States (US) HS athletes across 24 sports over a ten-year period. DESIGN: Descriptive epidemiology study SETTING: National sample of high schools participating in the High School Reporting Information Online (High School RIO) injury surveillance system...
September 12, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/28918981/potential-impacts-of-shipping-noise-on-marine-mammals-in-the-western-canadian-arctic
#9
William D Halliday, Stephen J Insley, R Casey Hilliard, Tyler de Jong, Matthew K Pine
As the Arctic warms and sea ice decreases, increased shipping will lead to higher ambient noise levels in the Arctic Ocean. Arctic marine mammals are vulnerable to increased noise because they use sound to survive and likely evolved in a relatively quiet soundscape. We model vessel noise propagation in the proposed western Canadian Arctic shipping corridor in order to examine impacts on marine mammals and marine protected areas (MPAs). Our model predicts that loud vessels are audible underwater when >100km away, could affect marine mammal behaviour when within 2km for icebreakers vessels, and as far as 52km for tankers...
September 15, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28918622/emission-changes-dwarf-the-influence-of-feeding-habits-on-temporal-trends-of-per-and-polyfluoroalkyl-substances-in-two-arctic-top-predators
#10
Heli Routti, Jon Aars, Eva Fuglei, Linda Hanssen, Karen Lone, Anuschka Polder, Åshild Ø Pedersen, Sabrina Tartu, Jeffrey M Welker, Nigel G Yoccoz
We monitored concentrations of per- and polyfluoroalkyl substances (PFASs) in relation to climate-associated changes in feeding habits and food availability in polar bears (Ursus maritimus) and arctic foxes (Vulpes lagopus) (192 plasma and 113 liver samples, respectively) sampled from Svalbard, Norway, during 1997-2014. PFASs concentrations became greater with increasing dietary trophic level, as bears and foxes consumed more marine as opposed to terrestrial food, and as the availability of sea ice habitat increased...
September 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28917879/laccase-tempo-oxidation-in-the-production-of-mechanically-strong-arabinoxylan-and-glucomannan-aerogels
#11
Kirsti Parikka, Ida Nikkilä, Leena Pitkänen, Abdul Ghafar, Tuula Sontag-Strohm, Maija Tenkanen
New wheat arabinoxylan and konjac glucomannan hydrogels and aerogels were prepared by hemiacetal crosslinking induced by laccase/TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) -catalysed oxidation, which selectively converts the primary hydroxyl groups to aldehydes. The degree of oxidation of the product aldehydes was ca. 10% of the total carbohydrates of the polysaccharides, and the determination of storage and viscous moduli of the oxidised samples showed that they had formed true hydrogels. Two freezing methods for the hydrogels, conventional freezing and ice crystal templating, were investigated for aerogel production, the ice crystal templated products especially were mechanically strong in compression test against the ice crystals' growth direction...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917791/development-of-salt-and-ph-induced-solidified-floating-organic-droplets-homogeneous-liquid-liquid-microextraction-for-extraction-of-ten-pyrethroid-insecticides-in-fresh-fruits-and-fruit-juices-followed-by-gas-chromatography-mass-spectrometry
#12
Mohammadali Torbati, Mir Ali Farajzadeh, Mostafa Torbati, Ali Akbar Alizadeh Nabil, Ali Mohebbi, Mohammad Reza Afshar Mogaddam
A new microextraction method named salt and pH-induced homogeneous liquid-liquid microextraction has been developed in a home-made extraction device for the extraction and preconcentration of some pyrethroid insecticides from different fruit juice samples prior to gas chromatography-mass spectrometry. In the present work, an extraction device made from two parallel glass tubes with different lengths and diameters was used in the microextraction procedure. In this method, a homogeneous solution of a sample solution and an extraction solvent (pivalic acid) was broken by performing an acid-base reaction and the extraction solvent was produced in whole of the solution...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917343/long-term-outcomes-for-cryotherapy-in-barrett-s-esophagus-with-high-grade-dysplasia-just-cracking-the-ice
#13
EDITORIAL
Koushik K Das, Gary W Falk
No abstract text is available yet for this article.
October 2017: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28916528/the-impact-of-cryoballoon-versus-radiofrequency-ablation-for-paroxysmal-atrial-fibrillation-on-healthcare-utilization-and-costs-an-economic-analysis-from-the-fire-and-ice-trial
#14
(no author information available yet)
No abstract text is available yet for this article.
September 15, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28915419/sensitivity-improvement-of-the-lc-ms-ms-quantification-of-carbidopa-in-human-plasma-and-urine-by-derivatization-with-2-4-pentanedione
#15
Nico C van de Merbel, Kees J Bronsema, Steven H Gorman, Ray Bakhtiar
The reliable quantification of carbidopa in biological samples at low concentrations is challenging because of the polar and highly unstable nature of the compound. In this paper, LC-MS/MS methods are described for the determination of carbidopa in 50μL of human plasma and 25μL of human urine in the concentration ranges 1-1,000ng/mL and 100-50,000ng/mL, respectively. After a simple protein precipitation (plasma) or dilution (urine) step, carbidopa is derivatized at its hydrazine moiety by reaction for one hour with 2,4-pentanedione under acidic conditions and at 40°C...
September 8, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28915088/abiotic-and-biotic-formation-of-amino-acids-in-the-enceladus-ocean
#16
Elliot L Steel, Alfonso Davila, Christopher P McKay
The active plume at Enceladus' south pole makes the indirect sampling of its global ocean possible. The partially resolved chemistry of the plume, which points to conditions that are seemingly compatible with life, has made orbital sampling missions a priority. We present a conceptual model of energy flux, hydrothermal H2 production, and both abiotic and biotic production of amino acids. Based on the energy flux observed at the south pole and the inferred internal hydrothermal activity, we estimate an H2 production of 0...
September 2017: Astrobiology
https://www.readbyqxmd.com/read/28915087/feasibility-of-detecting-bioorganic-compounds-in-enceladus-plumes-with-the-enceladus-organic-analyzer
#17
Richard A Mathies, Md Enayet Razu, Jungkyu Kim, Amanda M Stockton, Paul Turin, Anna Butterworth
Enceladus presents an excellent opportunity to detect organic molecules that are relevant for habitability as well as bioorganic molecules that provide evidence for extraterrestrial life because Enceladus' plume is composed of material from the subsurface ocean that has a high habitability potential and significant organic content. A primary challenge is to send instruments to Enceladus that can efficiently sample organic molecules in the plume and analyze for the most relevant molecules with the necessary detection limits...
September 2017: Astrobiology
https://www.readbyqxmd.com/read/28914358/dynamic-foraging-of-a-top-predator-in-a-seasonal-polar-marine-environment
#18
Ben G Weinstein, Ari S Friedlaender
The seasonal movement of animals at broad spatial scales provides insight into life-history, ecology and conservation. By combining high-resolution satellite-tagged data with hierarchical Bayesian movement models, we can associate spatial patterns of movement with marine animal behavior. We used a multi-state mixture model to describe humpback whale traveling and area-restricted search states as they forage along the West Antarctic Peninsula. We estimated the change in the geography, composition and characteristics of these behavioral states through time...
September 15, 2017: Oecologia
https://www.readbyqxmd.com/read/28912552/under-ice-availability-of-phytoplankton-lipids-is-key-to-freshwater-zooplankton-winter-survival
#19
Guillaume Grosbois, Heather Mariash, Tobias Schneider, Milla Rautio
Shortening winter ice-cover duration in lakes highlights an urgent need for research focused on under-ice ecosystem dynamics and their contributions to whole-ecosystem processes. Low temperature, reduced light and consequent changes in autotrophic and heterotrophic resources alter the diet for long-lived consumers, with consequences on their metabolism in winter. We show in a survival experiment that the copepod Leptodiaptomus minutus in a boreal lake does not survive five months under the ice without food...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28912451/unveiling-co2-heterogeneous-freezing-plumes-during-champagne-cork-popping
#20
Gérard Liger-Belair, Daniel Cordier, Jacques Honvault, Clara Cilindre
Cork popping from clear transparent bottles of champagne stored at different temperatures (namely, 6, 12, and 20 °C) was filmed through high-speed video imaging in the visible light spectrum. During the cork popping process, a plume mainly composed of gaseous CO2 with traces of water vapour freely expands out of the bottleneck through ambient air. Most interestingly, for the bottles stored at 20 °C, the characteristic grey-white cloud of fog classically observed above the bottlenecks of champagne stored at lower temperatures simply disappeared...
September 14, 2017: Scientific Reports
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