Institution
University of New Hampshire
Education•Durham, New Hampshire, United States•
About: University of New Hampshire is a education organization based out in Durham, New Hampshire, United States. It is known for research contribution in the topics: Population & Solar wind. The organization has 9379 authors who have published 24025 publications receiving 1020112 citations. The organization is also known as: UNH.
Topics: Population, Solar wind, Poison control, Magnetosphere, Heliosphere
Papers published on a yearly basis
Papers
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TL;DR: In this article, the authors demonstrate that parallel electric fields may be a fundamental particle acceleration mechanism in astrophysical plasmas by comparing the inferred parallel potentials of electrostatic shocks with particle energies.
Abstract: Electric field and energetic particle observations by the Fast Auroral Snapshot (FAST) satellite provide convincing evidence of particle acceleration by quasi-static, magnetic-field-aligned (parallel) electric fields in both the upward and downward current regions of the auroral zone. We demonstrate this by comparing the inferred parallel potentials of electrostatic shocks with particle energies. We also report nonlinear electric field structures which may play a role in supporting parallel electric fields. These structures include large-amplitude ion cyclotron waves in the upward current region, and intense, spiky electric fields in the downward current region. The observed structures had substantial parallel components and correlative electron flux modulations. Observations of parallel electric fields in two distinct plasmas suggest that parallel electric fields may be a fundamental particle acceleration mechanism in astrophysical plasmas.
282 citations
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TL;DR: Both ATM and ATR contribute to the induction of a CYCB1;1:GUS fusion by IR, but only ATR is required for the persistence of this response, and it is proposed that this upregulation of CYCB 1;1 does not reflect the accumulation of cells in G(2), but instead reflects a still unknown role for this cyclin in DNA damage response.
Abstract: The ATR and ATM protein kinases are known to be involved in a wide variety of responses to DNA damage. The Arabidopsis thaliana genome includes both ATR and ATM orthologs, and plants with null alleles of these genes are viable. Arabidopsis atr and atm mutants display hypersensitivity to gamma-irradiation. To further characterize the roles of ATM and ATR in response to ionizing radiation, we performed a short-term global transcription analysis in wild-type and mutant lines. We found that hundreds of genes are upregulated in response to gamma-irradiation, and that the induction of virtually all of these genes is dependent on ATM, but not ATR. The transcript of CYCB1;1 is unique among the cyclin transcripts in being rapidly and powerfully upregulated in response to ionizing radiation, while other G(2)-associated transcripts are suppressed. We found that both ATM and ATR contribute to the induction of a CYCB1;1:GUS fusion by IR, but only ATR is required for the persistence of this response. We propose that this upregulation of CYCB1;1 does not reflect the accumulation of cells in G(2), but instead reflects a still unknown role for this cyclin in DNA damage response.
282 citations
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Virginia Tech1, Oak Ridge National Laboratory2, University of Notre Dame3, Kansas State University4, Marine Biological Laboratory5, University of Vermont6, University of New Mexico7, Oregon State University8, Arizona State University9, Michigan State University10, United States Department of Agriculture11, Spanish National Research Council12, University of New Hampshire13, University of Georgia14, Procter & Gamble15
TL;DR: The Lotic Intersite Nitrogen eXperiment (LINX) was a coordinated study of the relationships between North American biomes and factors governing ammonium uptake in streams as mentioned in this paper.
Abstract: SUMMARY 1. The Lotic Intersite Nitrogen eXperiment (LINX) was a coordinated study of the relationships between North American biomes and factors governing ammonium uptake in streams. Our objective was to relate inter-biome variability of ammonium uptake to physical, chemical and biological processes. 2. Data were collected from 11 streams ranging from arctic to tropical and from desert to rainforest. Measurements at each site included physical, hydraulic and chemical characteristics, biological parameters, whole-stream metabolism and ammonium uptake. Ammonium uptake was measured by injection of 15 N-ammonium and downstream measurements of 15 N-ammonium concentration. 3. We found no general, statistically significant relationships that explained the variability in ammonium uptake among sites. However, this approach does not account for the multiple mechanisms of ammonium uptake in streams. When we estimated biological demand for inorganic nitrogen based on our measurements of in-stream metabolism, we found good correspondence between calculated nitrogen demand and measured assimilative nitrogen uptake.
282 citations
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TL;DR: Health care professionals, educators, and parents should be prepared to educate youth about how to respond to online sexual solicitations, including encouraging youth to disclose and report such encounters and to talk about them.
Abstract: ContextHealth care professionals, educators, and others are increasingly called
upon to advise parents and policymakers about risks posed to children by Internet
use. However, little scientific information exists on the experiences of children
online.ObjectiveTo assess the risk factors surrounding online sexual solicitations of
youth and distress due to solicitation.Design, Setting, and ParticipantsTelephone survey (August 1999–February 2000) of a random sample
of 1501 youth aged 10 through 17 years who were regular Internet users.Main Outcome MeasuresDemographic and behavioral characteristics associated with solicitation
risk and distress due to solicitation.ResultsNineteen percent of youth who used the Internet regularly were the targets
of unwanted sexual solicitation in the last year. Girls (P<.001), older teens (P = .005), troubled
youth (P = .004), frequent Internet users (P = .01), chat room participants (P<.001),
and those who communicated online with strangers (P<.001)
were at greater risk. Twenty-five percent of the solicited youth reported
high levels of distress after solicitation incidents. Risk of distress was
more common among the younger youth (P = .005), those
who received aggressive solicitations (the solicitor attempted or made offline
contact) (P = .001), and those who were solicited
on a computer away from their home (P = .001).ConclusionsMany young people who use the Internet encounter unwanted sexual overtures.
Health care professionals, educators, and parents should be prepared to educate
youth about how to respond to online sexual solicitations, including encouraging
youth to disclose and report such encounters and to talk about them.
282 citations
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TL;DR: In the case of Jakobshavn Isbrae, the authors showed that the speedup rate of ∼5% a−1 over much of the fast-moving region appears to be a diffusive response to the initial much larger speedup near the front.
Abstract: [1] Several new data sets reveal that thinning and speedup of Jakobshavn Isbrae continue, following its recent rapid increase in speed as its floating ice tongue disintegrated. The present speedup rate of ∼5% a−1 over much of the fast-moving region appears to be a diffusive response to the initial much larger speedup near the front. There is strong seasonality in speed over much of the fast-flowing main trunk that shows a good inverse correlation with the seasonally varying length of a short (typically ∼6 km) floating ice tongue. This modulation of speed with ice front position supports the hypothesis that the major speedup was caused by loss of the larger floating ice tongue from 1998 to 2003. Analysis of image time series suggests that the transient winter ice tongue is formed when sea ice bonds glacier ice in the fjord to produce a nearly rigid mass that almost entirely suppresses calving. Major calving only resumes in late winter when much of this ice clears from the fjord. The collapse of the ice tongue in the late 1990s followed almost immediately after a sharp decline in winter sea-ice concentration in Disko Bay. This decline may have extended the length of the calving season for several consecutive years, leading to the ice tongue's collapse.
282 citations
Authors
Showing all 9489 results
Name | H-index | Papers | Citations |
---|---|---|---|
Derek R. Lovley | 168 | 582 | 95315 |
Peter B. Reich | 159 | 790 | 110377 |
Jerry M. Melillo | 134 | 383 | 68894 |
Katja Klein | 129 | 1499 | 87817 |
David Finkelhor | 117 | 382 | 58094 |
Howard A. Stone | 114 | 1033 | 64855 |
James O. Hill | 113 | 532 | 69636 |
Tadayuki Takahashi | 112 | 932 | 57501 |
Howard Eichenbaum | 108 | 279 | 44172 |
John D. Aber | 107 | 204 | 48500 |
Andrew W. Strong | 99 | 563 | 42475 |
Charles T. Driscoll | 97 | 554 | 37355 |
Andrew D. Richardson | 94 | 282 | 32850 |
Colin A. Chapman | 92 | 491 | 28217 |
Nicholas W. Lukacs | 91 | 367 | 34057 |