Environmental Research to Improve Food Safety - a film |
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View this 15-minute film about research on the fate and transport of pathogenic bacteria in the environment. EMFSL scientists describe their research using a rainfall simulator and a special lysimeter site to investigate how bacteria infiltrate into soil or run off with surface water depending on rainfall and vegetation. Double-click on the video to view at full screen size. Questions about this research? Please contact Yakov Pachepsky.
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Video Transcript: ENVIRONMENTAL RESEARCH TO IMPROVE FOOD SAFETY A film by Ludmila Pachepsky |
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00:00 - Calm and soothing background music. Video title is displayed as camera pans over scene of fields and trees. 00:11 - Sound of machinery is heard. Outdoor experiment is shown in progress in an outdoor field: an irrigation device that simulates rainfall is spraying water over a grassy area, and people are working under the artificial rain. 00:23 - Introduction begins, with Dr. Dan Shelton speaking to camera. Caption is displayed briefly: Dr. Dan Shelton, research leader |
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Dan Shelton: |
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00:53 - Panoramic view of large experimental site is shown as Dan continues to speak I initiated this project back in the late nineties. I became aware of this site then, 01:00 - Camera returns to view of Dan And originally it had been built as a lysimeter site by the Nuclear Regulatory commission to study a leaching. It's a great site. They went into a great deal of trouble to build up a large amount of dirt, and they embedded in this large amount of dirt several different what I will call lysimeters. They dug them out to the depth of about 10 feet. |
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01:25 - Overhead bird's-eye view of the experimental site is shown They are completely lined and they are completely surrounded by gutters, so that any water that either infiltrates into the lysimeter or runs off can be collected. 01:36 - Camera returns to view of Dan |
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So, once I became aware of this site, I realized that it would be ideal for the kinds of runoff studies and infiltration studies that we need to conduct to understand how pathogens, their fate and transport in the environment. Of course, I had collaborators on this project. Colleagues at the time were Dr. Ali Sadeghi, and Dr. Al Isensee, and also a visiting scientist at the time Dr. Asad Ruhi. We were all working together to prepare this site with very specific soil types which we had trucked in from other sites. That was a very interesting process where we had all this soil excavated by a Gradall, which we normally see where there is a road construction work, and several dump truck loads of soil brought in. And the site manicured, so to speak, with this Gradall, to create soil of a certain depth and of a certain slope. At the time we created two of these lysimeter sites, one with a 20% slope and the other with a 10% slope. At the same time, because of the size of the plots, we wanted to have fairly consistent rainfall, simulated rainfall, and so a rainfall simulator was constructed. You will hear about it later more from Randy. The machinist was Paul Bosley, but also Dr. Asad Ruhi was also very much involved in the design of the rainfall simulator. When it all was ready, the initial work was done by a graduate student, now Dr. Reza Roodsari, he was at the University of Maryland, and he conducted his PhD research at these plots looking at the flow of bovine E. coli, from bovine manure as it would flow down this 20% slope on either vegetative or bare soil plots. It was very interesting, and it became very obvious at that point in time how vegetation affects the flow and how it facilitates infiltration of bacteria. For bacteria and pathogens, ideally, we want them infiltrating into the soil rather than running off with the surface water. So, you are going to see a lot more about this in the coming segments. That just gives you some background of how this whole project began. |
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04:00 - photo of a group of researchers working at the site Narrator: 04:07 - photos of the current 5-member field team of researchers: Dr. Yakov Pachepsky, project lead scientist; Dr. Karl Vanderlinden, visiting scientist from C?rdoba, Spain; Dr. Gonzalo Mart?nez, visiting scientist from C?rdoba, Spain; Randy Rowland, Support Scientist; Ryan Blaustein, hydrological technician |
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Narrator: |
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04:42 - Calm and soothing background music. Video of fields and trees in the background. Beltsville, Maryland, October 2011. 04:53 - Sound of machinery is heard as the video shows researchers working at the experimental site, examining details at ground level underneath the rainfall simulator. Background music. |
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05:34 - Dr. Yakov Pachepsky project lead scientist, is interviewed (by unseen narrator) at the experimental site. Narrator: Yakov Pachepsky: 07:10 - Colorized image from scanning electron microscope (SEM), showing pathogenic E. coli on a lettuce leaf. Image is shown at about 16,000 times normal size. Background music. 07:26 - Photo of cows in the pasture, overlaid with text of question for Dr. Pachepsky: What kind of manure do you use in this experiment? Yakov Pachepsky: 07:48 - Video of the experimental work continuing under the artificial rain. 07:53 - Randy Rowland is interviewed (by the unseen narrator) at the site. Narrator: Randy Rowland: Narrator: Randy Rowland: |
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09:22 - Video of continuing experimental work at the site. Calm and soothing background music plays as the narrator describes the work as it progresses. Narrator: Background music ends as narrator continues. Narrator: |
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Soil samples are taken to measure soil water content. A sampler is hammered into the soil, then soil samples from the top 5 cm and 5 to 10 cm layers are separated and placed into plastic bags. Finally, the rainfall simulation begins and samples are collected every 5 minutes. Karl and Yakov measure the amount of rainfall across the experimental plots. 11:34 - Calm and soothing background music. Photos of the current 5-member field team of researchers: Dr. Yakov Pachepsky, project lead scientist; Dr. Karl Vanderlinden, visiting scientist from C?rdoba, Spain; Dr. Gonzalo Mart?nez, visiting scientist from C?rdoba, Spain; Dr. Randy Rowland, Support Scientist; Ryan Blaustein, hydrological technician |
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11:34 - Calm and soothing background music. Photos of the current 5-member field team of researchers: Dr. Yakov Pachepsky, project lead scientist; Dr. Karl Vanderlinden, visiting scientist from C?rdoba, Spain; Dr. Gonzalo Mart?nez, visiting scientist from C?rdoba, Spain; Dr. Randy Rowland, Support Scientist; Ryan Blaustein, hydrological technician 11:41 - Dr. Yakov Pachepsky, project lead scientist, is interviewed (by the unseen narrator) in his office. Narrator: |
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Yakov Pachepsky: 13:42 - Background music. Photo of an assemblage of fresh produce items (apples, oranges, tomatoes, bell peppers, limes, carrots, radishes, scallions, celery, cranberries), overlaid with text: "We want our food safe" 13:55 - Film credits begin as background music continues. "Environmental Research to Improve Food Safety" film by Ludmila Pachepsky, former USDA researcher. Photo of Ludmila Pachepsky. Music by David Beard. Please visit www.davidbeardmusic.com for Original score & Stock Music. Photo of Jo Ann Van Kessel. Narration by Dr. Jo Ann Van Kessel. Colorized SEM image of E. coli (shown earlier in the video). Photo courtesy of Peter Cook and Steven Ausmus, USDA Agricultural Research Service. |
Environmental Microbial and Food Safety Laboratory
Beltsville Agricultural Research Center, Beltsville, MD 20705
www.ars.usda.gov/nea/barc/emfsl