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Background: Various types of near work have been suggested to promote the incidence and progression of myopia, while outdoor activity appears to prevent or retard myopia. However, there is a lack of consensus on how to interpret these results and translate them into effective intervention strategies. This study examined the association between visual acuity and time allocated to various activities among school-going children.
Methods: Population-based survey of 19,934 students in grade 4 and 5 from 252 randomly selected rural primary schools in Northwest China in September 2012. This survey measured visual acuity and collected self-reported data on time spent outdoors and time spent doing various types of near activities.
We thank S. Jamilla, E. Goldman and I. Collins for creating the database. We thank K. Chomitz, T. Coger, J. Engelmann, N. Harris, H. Nembhard, F. Stolle and N. Ullery and participants at the Environmental and Resources Seminar of the University of Wisconsin-Madison and at the Applied Economics Seminar at Oregon State University for comments. We acknowledge funding from the World Resources Institute; the organization had no input into the study design nor impact on the presentation of the results.
The following table summarizes by object the potential future Earth impact events that the JPLSentry Systemhas detected based on currently available observations.Click on the object designation to go to a page with full details on that object.
Sentry is a highly automated collision monitoring system thatcontinually scans the most current asteroid catalog for possibilitiesof future impact with Earth over the next 100 years.Whenever a potential impact is detected it will be analyzed and the resultsimmediately published here, except in unusual cases where we seek independent confirmation.It is normal that, as additional observations become available,objects will disappear from this table whenever there are no longerany potential impact detections. For this reason we maintain alist of removed objects with the date of removal.
Transposons are mobile elements that are commonly silenced to protect eukaryotic genome integrity. In plants, transposable element (TE)-derived inverted repeats (IRs) are commonly found near genes, where they affect host gene expression. However, the molecular mechanisms of such regulation are unclear in most cases. Expression of these IRs is associated with production of 24-nt small RNAs, methylation of the IRs, and drastic changes in local 3D chromatin organization. Notably, many of these IRs differ between Arabidopsis thaliana accessions, causing variation in short-range chromatin interactions and gene expression. CRISPR-Cas9-mediated disruption of two IRs leads to a switch in genome topology and gene expression with phenotypic consequences. Our data show that insertion of an IR near a gene provides an anchor point for chromatin interactions that profoundly impact the activity of neighboring loci. This turns IRs into powerful evolutionary agents that can contribute to rapid adaptation.
Combining the outputs of steps one and two gives us a range of the number of jobs that may be feel the initial impact: 44 million to 57 million jobs negatively impacted by shutdowns, offset by 2 to 3 million new jobs in high-growth industries and roles. Throughout this article, we refer to the top of the range of 54 million net new jobs in both text and exhibits. We also looked at the geographic distribution of occupations to determine where losses will be concentrated.
American workers are already feeling the pain. Initial unemployment claims for the week ending March 21 soared to 3,307,000, nearly 15 times higher than the 211,000 claims filed just two weeks before and shattering the previous high of 692,000, reached in 1982. Just a week later, the number for the week ending March 28 more than doubled again, to 6,648,000 (Exhibit 1). Our own analysis finds that the first phase of the battle to contain COVID-19 could leave 42 million to 54 million net jobs vulnerable to reductions in hours or pay, temporary furloughs, or permanent layoffs. Many Americans are simply unable to go to work for an uncertain period of time. (However, this is not a forecast of the unemployment rate; see the sidebar for more on methodology.)
Looking across industries, those experiencing the biggest negative impact typically pay low wages and employ workforces with low educational attainment (Exhibit 6). Previous research from MGI found that these jobs have disproportionate concentrations of African-Americans, Hispanics, and people with a high-school education or less.
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Near Third Impact (ニアサードインパクト, Nia Sado Impacto?) is a near cataclysmic event which occurred at the end of Evangelion: 2.0 You Can (Not) Advance resulting from a failed attempt to cause Third Impact in the Rebuild of Evangelion film series. The aftermath of the Near Third Impact is explored in Evangelion: 3.0 You Can (Not) Redo. It is also referred to in the movies as "N3I".
Septic systems may impact local drinking water wells or surface water bodies. The extent of this impact depends on how well your septic system is designed, installed, maintained and if it is used properly. Systems that are sited in densities that exceed the treatment capacity of regional soils and systems that are poorly designed, installed, operated or maintained can cause problems.
Septic systems provide wastewater treatment for many homeowners who also often get their drinking water from private wells. If a septic system is not working properly or is located too close to a drinking water well, contaminants from the wastewater can end up in drinking water. Learn how to locate, operate, and maintain your septic system to protect nearby wells.
Many homeowners rely on septic systems for safe and effective treatment of their wastewater. Household wastewater is treated by a septic system before it filters into the soil. Recycled water from a septic system can help replenish groundwater supplies; however, if the system is not working properly, it can contaminate nearby waterbodies. Learn how nutrients and pathogens from your septic system may impact streams, lakes, or other waterbodies near your home.
After its discovery in 2004, asteroid 99942 Apophis had been identified as one of the most hazardous asteroids that could impact Earth. But that impact assessment changed as astronomers tracked Apophis and its orbit became better determined.
Now, the results from a new radar observation campaign combined with precise orbit analysis have helped astronomers conclude that there is no risk of Apophis impacting our planet for at least a century.
Estimated to be about 1,100 feet (340 meters) across, Apophis quickly gained notoriety as an asteroid that could pose a serious threat to Earth when astronomers predicted that it would come uncomfortably close in 2029. Thanks to additional observations of the near-Earth object (NEO), the risk of an impact in 2029 was later ruled out, as was the potential impact risk posed by another close approach in 2036. Until this month, however, a small chance of impact in 2068 still remained.
When Apophis made a distant flyby of Earth around March 5, astronomers took the opportunity to use powerful radar observations to refine the estimate of its orbit around the Sun with extreme precision, enabling them to confidently rule out any impact risk in 2068 and long after.
The release of sulfur and nitrogen into the atmosphere by power plants and agricultural activities--commonly referred to as acid rain--plays a minor role in making the ocean more acidic on a global scale, but the impact is greatly amplified in the shallower waters of the coastal oceans, according to new research.
"Acid rain isn't just a problem of the land; it's also affecting the ocean," said Scott Doney, lead author of the study and a scientist at the Woods Hole Oceanographic Institution (WHOI) in Woods Hole, Mass. "That effect is most pronounced near the coasts, which are already some of the most heavily affected and vulnerable parts of the ocean due to pollution, overfishing and climate change."
The research team compiled and analyzed many publicly available data sets on fossil fuel emissions, agricultural runoff and other atmospheric emissions. The scientists built theoretical and computational models of the ocean and atmosphere to simulate where nitrogen and sulfur emissions were likely to have the most impact. They also compared their model results with field observations made by other researchers in the coastal waters around the United States.
The U.S. National Science Foundation propels the nation forward by advancing fundamental research in all fields of science and engineering. NSF supports research and people by providing facilities, instruments and funding to support their ingenuity and sustain the U.S. as a global leader in research and innovation. With a fiscal year 2023 budget of $9.5 billion, NSF funds reach all 50 states through grants to nearly 2,000 colleges, universities and institutions. Each year, NSF receives more than 40,000 competitive proposals and makes about 11,000 new awards. Those awards include support for cooperative research with industry, Arctic and Antarctic research and operations, and U.S. participation in international scientific efforts.
A near-Earth object (NEO) is any small Solar System body whose orbit brings it into proximity with Earth. By convention, a Solar System body is a NEO if its closest approach to the Sun (perihelion) is less than 1.3 astronomical units (AU).[2] If a NEO's orbit crosses the Earth's orbit, and the object is larger than 140 meters (460 ft) across, it is considered a potentially hazardous object (PHO).[3] Most known PHOs and NEOs are asteroids, but a small fraction are comets.[1]
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