653 research outputs found

    Noble gas composition in rainwater and associated weather patterns

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    This work represents the first comprehensive noble gas study in rainwater. It was carried out in southeast Michigan. Results show that all rainwater samples are in disequilibrium with surface conditions. Two noble gas patterns are identified. The first one, associated with low‐pressure systems, presence of fog and light rainfall, displays a relative Ar enrichment together with Ne, Kr, and Xe depletion. The second one, associated with the passage of frontal systems, displays a mass‐dependent depletion pattern. Precipitation is characterized by thunderstorms, heavy rainfall, and high cloud ceiling heights. A diffusion mass‐transfer model suggests that noble gas patterns originate from ice. Complete re‐equilibration with surface conditions should occur within hours. For the first time, this study establishes a direct correlation between the noble gas composition in rainwater and weather patterns and highlights their potential to identify timing and location of recharge in shallow aquifer systems where infiltration is rapid. Key Points Noble gases in rainwater are in disequilibrium with surface conditions Rainwater noble gas patterns are associated with weather conditions Ice is the starting point of rainwater formation in southeast MichiganPeer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/1/FigureS12.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/2/FigureS5.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/3/Supplementary_Text_3_revised2_Trackchanges.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/4/FigureS1.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/5/FigureS8.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/6/TableS2.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/7/Supplementary_all.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/8/SuppText_2.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/9/FigureS4.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/10/FigureS9.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/11/TableS3.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/12/FigureS7.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/13/TableS4.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/14/SuppText_1.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/15/FigureS10.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/16/Supplementary_Text_3_revised2_NOhighlight.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/17/FigureS3.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/18/grl50610.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/19/FigureS6.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/20/FigureS11.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/21/TableS1.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/22/SuppText_4.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/99103/23/FigureS2.pd

    Genes are Gems: Reporting Agri-Biotechnology A Sourcebook for Journalists

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    The inspiration for a sourcebook on agri-biotechnology reporting originated at this workshop series. The idea was to collate the knowledge and wisdom gained from the workshops and put them into a handy reference book for science communicators and journalists. From the presentations of biotechnology scientists and communication specialists, experiences of journalists that were shared, and the writing exercises done at the workshops, we have distilled the practical advice and guidelines that are in this sourcebook for agri-biotechnology reporting. We are certain that the impact of this sourcebook will not end with the communicators alone. The media’s multiplier effect impacts the decision of policymakers, which in turn will lead to informed actions that will significantly improve the lives of poor farmers. This volume, Genes are Gems: Reporting Agri-Biotechnology, is our offering to science communicators who want to report on agribiotechnology. May your tribe increase

    Tunable Oscillations in the Purkinje Neuron

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    In this paper, we study the dynamics of slow oscillations in Purkinje neurons in vitro, and derive a strong association with a forced parametric oscillator model. We demonstrate the precise rhythmicity of the oscillations in Purkinje neurons, as well as a dynamic tunability of this oscillation using a photo-switchable compound. We show that this slow oscillation can be induced in every Purkinje neuron, having periods ranging between 10-25 seconds. Starting from a Hodgkin-Huxley model, we also demonstrate that this oscillation can be externally modulated, and that the neurons will return to their intrinsic firing frequency after the forced oscillation is concluded. These results signify an additional functional role of tunable oscillations within the cerebellum, as well as a dynamic control of a time scale in the brain in the range of seconds.Comment: 12 pages, 5 figure

    Prevalence and resolution of lupus anticoagulant in children

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    Background: Lupus anticoagulant (LA) is an autoantibody that inhibits phospholipid-dependent reactions. Studies on the incidence and prevalence of LA in the pediatric population are lacking. The objective of our study was to determine the incidence and potential risk of complications of LA in children presenting with abnormal partial thromboplastin time (PTT). Our secondary objective was to identify signs, symptoms, and medical history associated with the presence of LA as documented in the literature. We focused on the correlation between signs of LA in the form of laboratory values consistent with bleeding abnormalities and the presence of clinical symptoms of bleeding. Methods: We conducted a record-based retrospective analysis of 112 children and adolescents referred to the Department of Hematology/Oncology at Children’s Hospital of New Orleans for abnormal coagulation profiles and/or history of mucocutaneous bleeding. Participants were followed up until PTT values normalized. Results: In our study population with suspected bleeding disorder, the preliminary incidence of LA was 21%. We found that resolution of LA correlated with correction of PTT in 90% of patients. Conclusion: To minimize extensive and expensive blood workup, we recommend that screening for LA be included in the evaluation of children with prolonged PTT, even if they have a negative history of bleeding problems

    Storage Duration and Temperature Effects of Strychnos potatorum Stock Solutions on its Coagulation Efficiency

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    This study presents the effects of storage duration and temperature of Strychnos potatorum stock solution on its coagulation efficiency. Coagulation efficiency of the seed extracts on water samples depended on the initial turbidity of the water sample. The stock solutions could clarify only highly turbid solutions. The optimum dosage of the stock solutions was 5% and optimal time required was 50 minutes. S. potatorum stock solutions, which were kept at room temperature (28 °C), had a shelf life of only five days and were able to remove turbidity from high and low turbidity water samples and no coagulation activity was observed for medium turbidity. The highest turbidity removals were observed for stock solutions, which were kept for three days. For stock solutions which were stored in refrigerator, shelf life was extended upto seven days, and the turbidity removal efficiencies improved from 45.9 to 63.8 for low and 43.7 to 64.9 % for high turbidity water samples, respectively

    Sex and age differences in "theory of mind" across 57 countries using the English version of the "Reading the Mind in the Eyes" Test.

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    The "Reading the Mind in the Eyes" Test (Eyes Test) is a widely used assessment of "theory of mind." The NIMH Research Domain Criteria recommends it as one of two tests for "understanding mental states." Previous studies have demonstrated an on-average female advantage on the Eyes Test. However, it is unknown whether this female advantage exists across the lifespan and across a large number of countries. Thus, we tested sex and age differences using the English version of the Eyes Test in adolescents and adults across 57 countries. We also tested for associations with sociodemographic and cognitive/personality factors. We leveraged one discovery dataset (N = 305,726) and three validation datasets (Ns = 642; 5,284; and 1,087). The results show that: i) there is a replicable on-average female advantage in performance on the Eyes Test; ii) performance increases through adolescence and shallowly declines across adulthood; iii) the on-average female advantage is evident across the lifespan; iv) there is a significant on-average female advantage in 36 out of 57 countries; v) there is a significant on-average female advantage on translated (non-English) versions of the Eyes Test in 12 out of 16 countries, as confirmed by a systematic review; vi) D-scores, or empathizing-systemizing, predict Eyes Test performance above and beyond sex differences; and vii) the female advantage is negatively linked to "prosperity" and "autonomy," and positively linked to "collectivism," as confirmed by exploratory country-level analyses. We conclude that the on-average female advantage on the Eyes Test is observed across ages and most countries
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