277 research outputs found
Every apple has a voice: using stable isotopes to teach about food sourcing and the water cycle
Agricultural crops such as fruits take up irrigation and meteoric water and
incorporate it into their tissue (fruit water) during growth, and the
geographic origin of a fruit may be traced by comparing the H and O stable
isotope composition (δ2H and δ18O values) of fruit water to the global geospatial distribution of H and O stable isotopes in
precipitation. This connection between common fruits and the global water
cycle provides an access point to connect with a variety of demographic
groups to educate about isotope hydrology and the water cycle. Within the
context of a 1-day outreach activity designed for a wide spectrum of
participants (high school students, undergraduate students, high school
science teachers) we developed introductory lecture materials, in-class
participatory demonstrations of fruit water isotopic measurement in real
time, and a computer lab exercise to couple actual fruit water isotope data
with open-source online geospatial analysis software. We assessed learning
outcomes with pre- and post-tests tied to learning objectives, as well as
participant feedback surveys. Results indicate that this outreach activity
provided effective lessons on the basics of stable isotope hydrology and the
water cycle. However, the computer lab exercise needs to be more specifically
tailored to the abilities of each participant group. This pilot study
provides a foundation for further development of outreach materials that can
effectively engage a range of participant groups in learning about the water
cycle and the ways in which humans modify the water cycle through
agricultural activity
Insignificant Change in Antarctic Snowfall Since the International Geophysical Year
Antarctic snowfall exhibits substantial variability over a range of timescales, with consequent impacts on global sea level and the mass balance of the ice sheets. To assess how snowfall has affected the thickness of the ice sheets in Antarctica and to provide an extended perspective, we derived a 50-year time series of snowfall accumulation over the continent is derived by combining model simulations and observations primilarly from ice cores. There has been no statistically significant change in snowfall since the 1950s indicating that Antarctic precipitation is not mitigating global sea level rise as expected, despite recent winter warming of the overlying atmosphere
Recommended from our members
Design aspects of an electrostatic electron cooler for low-energy RHIC operation
Electron cooling was proposed to increase the luminosity of the Relativistic Heavy Ion Collider (RHIC) operation for heavy ion beam energies below 10 GeV/nucleon. The electron cooling system needed should be able to deliver an electron beam of adequate quality in a wide range of electron beam energies (0.9-5 MeV). An option of using an electrostatic accelerator to produce electrons for cooling heavy ions in RHIC was evaluated in detail. In this paper, we describe the requirements and options which were considered in the design of such a cooler for RHIC, as well as the associated challenges. The expected luminosity improvement and limitations with such an electron cooling system are also discussed
Clinical, Biological and Genetic Analysis of Prepubertal Isolated Ovarian Cyst in 11 Girls
BACKGROUND: The cause of isolated gonadotropin-independent precocious puberty (PP) with an ovarian cyst is unknown in the majority of cases. Here, we describe 11 new cases of peripheral PP and, based on phenotypes observed in mouse models, we tested the hypothesis that mutations in the GNAS1, NR5A1, LHCGR, FSHR, NR5A1, StAR, DMRT4 and NOBOX may be associated with this phenotype. METHODOLOGY/PRINCIPAL FINDINGS: 11 girls with gonadotropin-independent PP were included in this study. Three girls were seen for a history of prenatal ovarian cyst, 6 girls for breast development, and 2 girls for vaginal bleeding. With one exception, all girls were seen before 8 years of age. In 8 cases, an ovarian cyst was detected, and in one case, suspected. One other case has polycystic ovaries, and the remaining case was referred for vaginal bleeding. Four patients had a familial history of ovarian anomalies and/or infertility. Mutations in the coding sequences of the candidate genes GNAS1, NR5A1, LHCGR, FSHR, NR5A1, StAR, DMRT4 and NOBOX were not observed. CONCLUSIONS/SIGNIFICANCE: Ovarian PP shows markedly different clinical features from central PP. Our data suggest that mutations in the GNAS1, NR5A1, LHCGR, FSHR StAR, DMRT4 and NOBOX genes are not responsible for ovarian PP. Further research, including the identification of familial cases, is needed to understand the etiology of ovarian PP
Recommended from our members
RHIC low energy tests and initial operations
Future Relativistic Heavy Ion Collider (RHIC) runs, including a portion of FY10 heavy ion operations, will explore collisions at center of mass energies of 5-50 GeV/n (GeV/nucleon). Operations at these energies is motivated by a search for the QCD phase transition critical point. The lowest end of this energy range is nearly a factor of four below the nominal RHIC injection center of mass energy of {radical} s = 20.8 GeV/n. There are several operational challenges in the RHIC low-energy regime, including harmonic number changes, small longitudinal acceptance, lowered magnet field quality, nonlinear orbit control, and luminosity monitoring. We report on the experience with some of these challenges during beam tests with gold in March 2008, including first RHIC operations at {radical}s = 9.18 GeV/n and first beam experience at {radical}s = 5 GeV/n
Structural Basis of the Aberrant Receptor Binding Properties of Hagfish and Lamprey Insulinsâ€
Recommended from our members
Experience in Reducing Electron Cloud and Dynamic Pressure Rise in Warm and Cold Regions in Rhic.
The large scale application of non-evaporable getter coating in RHIC has been effective in reducing the electron cloud. Since beams with higher intensity and smaller bunch spacing became possible in operation, the emittance growth is of concern. Study results are reported together with experiences of machine improvements: saturated NEG coatings, anti-grazing ridges in warm sections, and the pre-pumping in cryogenic regions
Beziehungsorientierte Intervention am Beispiel des „Ich bleibe cool“-Trainings zur Förderung prosozialer Verhaltensweisen und konstruktiver Konfliktlösestrategien bei Kindern im Grundschulalter
- …