University of California, Davis, scientists are helping rice farmers in Uruguay stop polluting their waterways -- including drinking-water sources and a globally valuable nature reserve.
With funding from the U.S. National Institutes of Health's Fogarty International Center, the UC Davis researchers helped Uruguayan university colleagues devise a simple water test that tells whether it is safe to drain flooded rice fields.
The test checks for the herbicide clomazone, which is used on 78 percent of Uruguay's rice fields.
Clomazone in high doses can cause liver disease in experimental animals. It also is known to disrupt fish hormones, affecting their ability to reproduce, which becomes a problem for all the plants and animals in the region.
However, clomazone usually degrades to safe levels during the rice-growing season. Holding water on the fields for just the right amount of time can make the water safe for streams and rivers, without damaging the farmer's harvest.
The new test technology gives scientists a way to determine whether the degradation process is complete; eventually, it should be available to farmers in a simple "dipstick" field test. The farmer would take a few ounces of water from the rice paddy, dip in the test stick, and wait a few minutes for results. If the stick color turns one color, the water is safe to release. If it turns a different color, the farmer should wait a few days and test again.
Developing best rice-farming practices to avoid release of toxic chemicals to the environment is especially urgent in Uruguay, because water drained from the country's main area of rice cultivation flows into the marshlands of the Eastern Biosphere Reserve (Reserva de Biosfera Humedales del Este). This reserve is managed as part of the United Nations' UNESCO Man and Biosphere Reserve Program, which promotes environmentally sustainable human development.
This reserve is also the headwaters of streams and rivers that provide water to hundreds of thousands of people and millions of birds.
The new test is described in a study published today in the online edition of The Journal of Agricultural and Food Chemistry. Three of the nine study authors are UC Davis faculty members affiliated with the UC Davis Fogarty International Center. They helped Uruguayan graduate student Mariana Carlomagno learn the techniques needed to develop such tests, which scientists call ELISAs, short for "enzyme-linked immunosorbent assay." (Home pregnancy tests are common examples of ELISA technology.)
In Uruguay, Carlomagno is a graduate student in the laboratory of chemistry professor Gualberto Gonzalez-Sapienza at the University of the Republic in Montevideo. Fogarty funding allowed her to travel to UC Davis as a visiting scholar and train with associate research scientist James Sanborn in entomologist Bruce Hammock's laboratory in the College of Agricultural and Environmental Sciences.
Jerold Last, a UC Davis professor of pulmonary, critical-care and sleep medicine, founded and directs the UC Davis Fogarty International Center. The center is an outgrowth of Last's 1999 Fulbright Professorship, during which he lived for six months in Montevideo and in Salta, Argentina, and recognized the needs for advanced training in environmental toxicology in the region. Last founded the Fogarty Center in 2001 to train scientists in South America how to create and use ELISAs and other molecular analyses to enhance public health and environmental protection.
"This is a great example of translating basic research expertise at UC Davis to help train an international graduate student who will go home and improve her country's quality of science, protect its environment, and solve a need of its agricultural industry," Last said.
The UC Davis Fogarty International Center's annual funding of about $150,000 comes from the National Institutes of Health (NIH) program of the same name.
The UC Davis center's activities currently involve three scientists at UC Davis in leadership roles and as many as a dozen more as training faculty, along with four scientists in three South American countries in leadership roles and about 12 more as training faculty, with several dozen South American trainees seeking advanced degrees.
Other successful projects in the UC Davis Fogarty Center's nine-year history include:ELISAs for algal toxins in recreational and drinking water in Uruguay, Argentina, and Peru, which led to ongoing government-sponsored surveillance programs;
Graduate-level courses taught online ("distance learning") to support a new master's degree program in environmental toxicology in Argentina.
The U.S. National Institutes of Health's Fogarty International Center is 41 years old, has a $69 million annual budget, and supports global health research and training programs involving about 5,000 scientists in the United States and more than 100 other countries.
In one further connection between UC Davis and Uruguay, the fieldwork in Uruguay was funded by a contract from the National Institute for Farming Research (INIA), which is the Uruguayan government agency serving as the research arm of the Uruguayan agricultural industry. The research institute's director, Alvaro Roel, received his doctoral degree in ecology from UC Davis in 2003, then returned to Uruguay to improve the rice industry in his home country.
The paper, "A Clomazone Immunoassay to Study the Environmental Fate of the Herbicide in Uruguayan Rice Production," is online at http://pubs.acs.org/doi/abs/10.1021/jf9043259.
Jerold Last | EurekAlert!
Filling intercropping info gap
16.11.2017 | American Society of Agronomy
Climate change, population growth may lead to open ocean aquaculture
05.10.2017 | Oregon State University
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
17.11.2017 | Physics and Astronomy
17.11.2017 | Health and Medicine
17.11.2017 | Studies and Analyses