Agricultural and Biological Engineering
Scientists in the Department of Agricultural and Biological Engineering apply engineering principles to solve problems in biological systems. Related research includes the human body's reaction to medical implants, the engineering of biological machines, computation and modeling of biological systems, renewable bioenergy, animals generating solid wastes at animal production facilities, and production and processing of plants in agricultural systems.
Learn more at abe.msstate.edu
The point of impact
Nayeon Lee, MSU biological engineering doctoral student, conducted research on woodpecker beaks to discover more about their shock-absorbing capabilities. Insight from the study could help researchers apply biological principles to man-made design including the design of football helmets with better shock-absorbing capabilities. Lakiesha Williams, associate professor of agricultural and biological engineering in the university’s Mississippi Agricultural and Forestry Experiment Station and Mark Horstemeyer, CAVS chair professor in mechanical engineering, directed Lee’s research. Results from this research contributed to a recently patented idea. Horstemeyer was successful in patenting specific shock-mitigating materials and methods found in nature for use in man-made design principles. The research also addresses an Experiment Station research priority to prevent disease, injury and disability, subsequently enhancing the quality of life for Mississippi residents.
Vaccine leads to better survival, bigger fish
MSU scientists have developed a vaccine and vaccine delivery system to protect catfish from commonly occurring bacteria that can cause death. During their first growing season, every catfish fingerling raised in the Mississippi Delta will be exposed to Edwardsiella ictaluri, the bacteria that causes enteric septicemia, or ESC. In research trials, vaccinated catfish have a relative percent survival rate above 90 percent. Vaccinated fish are also 20 percent larger than unvaccinated fish. MSU’s vaccine and delivery method were developed at the Thad Cochran Warmwater Aquaculture Center and received a provisional patent in 2013.
Beach landscaping to protect the coast
A project that began on a 3-acre section of beach in 1995 continues to grow and serve as a model for mitigating storm damage and reducing cleanup costs along the Mississippi Gulf Coast. Agricultural engineer Thomas Cathcart and landscape architect Pete Melby developed an experimental beach with limited mechanical maintenance and lots of native plants, which had a dramatic effect on beach erosion in the area. Based on this success, they were commissioned to design a similar landscape along 26 miles of man-made coastal beach in Harrison County. In addition to controlling erosion, this landscaping was designed to keep sand off adjacent highways, reduce the impact of storm damage, and provide other environmental benefits such as filtering pollutants. After its most recent test when Hurricane Isaac came ashore in 2012, the beach’s vegetation remained intact and will continue to regenerate. Sea oats that formed the foredunes—the line of protective dunes closest to the water—were flattened by Isaac’s storm surge but will regrow and recreate the dunes. A salt marsh, planted with deep-rooted grasses, was unaffected by the storm and did its job of reducing erosion from the beach edge. These landscaping features have proven their ability to not only improve the local ecosystem, but also save money on highway sand cleanups and beach replenishment
Repairing reproductive disorders
Biomedical engineer Jun Liao is performing groundbreaking research that could lead to a new treatment for Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome, a reproductive disorder that affects about one in 5,000 women whose pelvic organ development is incomplete. MRKH causes pain, inability to conceive, improper hormone development, and other problems. The most common surgical treatment is the McIndoe vaginoplasty, where a skin or muscle graft from the patient’s leg is used to create a tissue-engineered vaginal patch. Liao is developing a method of using microscopic tissue from the reproductive organs of female sheep—the most similar to human tissue—to create grafts for treating MRKH. Preliminary results suggest that the bioengineered vaginal tissue can work as a treatment. However, further research must be conducted to determine the biocompatibility and cell-support capability of these grafts.
Improving battlefield safety
Biomedical engineer Lakiesha Williams is creating digital models of how the human body responds to blasts from improvised explosive devices (IED) to provide the data necessary to better protect men and women in uniform. Her primary focus is on the lower extremities, specifically how bone, muscle, and skin deform under very high blast pressure such as that suffered in an explosion that occurs under a vehicle. Williams’s work is unique because other simulations have not focused as specifically on IED explosions or produced the level of anatomical and mathematical detail in their models. The MSU models show how an IED blast causes the skin to tear, bones to break, and muscles to rip. Ultimately, this data will be coupled with research to develop enhanced safety countermeasures for soldiers with the goal of increasing battlefield survivability.
Safer Horse Transportation
There has been little research to measure the heat conditions in horse trailers during transport. MAFES scientists recently measured several temperature variables in a fully enclosed four-horse, ant-load trailer with and without animals. Scientists found that trailer temperatures during transport exceeded those recommended for animal housing, although the thermal environment was affected by vehicle speed, vent configuration and presence of animals. They found that temperature increased significantly in transport during relatively mild weather, which indicates that horses could suffer from heat stress during warmer weather. These results show the importance of closely monitoring heat conditions in trailers used to transport horses.
Developing Synthetic Fuel
The emergence of biomass-based energy warrants the evaluation of synthetic gas, or "syngas," as a fuel for personal power systems. Syngas uses oxygen to convert biomass and coal into carbon monoxide and hydrogen. MAFES scientists recently examined the performance and exhaust of a commercial generator modified to run on 100 percent syngas compared with a gasoline-powered generator. The overall efficiency of the generator at maximum electrical power output was the same for both fuels.
Researchers Make 'Elusieve' Dreams Happen
Ground corn flour, soybean meal and distillers dried grains with solubles (DDGS) — a by-product from ethanol production — comprise more than 70 percent of swine and poultry diets. While these ingredients are important for livestock nutrition, they are high in fiber, which is not easily digested by swine and poultry. Feed producers needed a system to remove the fiber while maintaining vital nutrients.
MAFES scientists developed a process called "Elusieve" that uses a combination of sieving and air classification to separate fiber from feeds. This technique sifts particles into four sizes and then blows them with air to remove fiber. They found that fiber separation increases starch content of ground corn flour by 3 percent and increases protein contents of DDGS and soybean meal.