Category Archives: College of Forestry

How to not come unglued: A wood adhesive story

It all started with a broken (tanbur) neck

A traditional Persian tanbour. Photo credit: nasehpour.com

While playing the tanbur in his native country of Iran, tonight’s guest Yahya Mousavi found the wooden instruments are sensitive to the moisture and it cannot produce high quality sounds in humid conditions. The tanbur, a traditional Persian string instrument, is the ancient ancestor of the guitar with a pear-shaped body composed of wood, a long neck, and many strings. In his third year of undergraduate studies, Yahya begin to develop a suitable substitute for wood in making musical instruments. He shared his idea with his professor. The professor was excited about the idea and allowed Yahya to pursue the research, which resulted in many publications, such as [1-3], both in English and Persians, as well as the manufacturing a tanbur, a setar, and a tar (the names of some Persian musical instruments) from polymeric composites, rather than wood.

Hunting for safe adhesive alternatives

Wood Science & Engineering PhD Student, Yahya Mousavi

It seems that wood science has always piqued Yahya’s interest, but now instead of focusing on instruments, he is focusing on an issue with a much broader impact – developing a safe, sustainable adhesive for wood composite production. Wood-composites such as particleboard and plywood wood are mainly used to construct buildings, make furniture, cabinetry, etc.; however, in order to make these wood composite panels, an adhesives have to be used to hold all the layers together. The problem is, the adhesive that has been used historically and is currently in use contains the toxic chemical formaldehyde, which is known to cause different cancers and mental disorders. The California Air Resources Board (CARB) passed a regulation on limiting formaldehyde emission from wood-based products used and sold in California in April 2007. A national regulation of limiting formaldehyde emission, ‘‘formaldehyde standards for composite wood products act,’’ was signed into law on July 7, 2010.

This has been the focus of Yahya’s PhD research for the past three years in Dr. Kaichang Li’s lab in the Department of Wood Science and Engineering in Oregon State University’s College of Forestry. The first goal of the research was to find a safe replacement for formaldehyde-based adhesives. Currently, isocyanates is being used as a replacement, but poses similar health risks. Secondly, the Li Lab was seeking to find something renewable. Yahya set out to find if he could fulfill both of these goals with soybean-based adhesives. In order to do so, he would need to find a way to make an adhesive that could pass all the standard requirements for use, which requires various water soaking tests. The main issue with soy-based adhesives was that they are not water resistant.

Close-up view of plywood board. Photo credit: apawood.org

Success for soy-based adhesives

In his research, Yahya was able to crosslink the functional groups of soybean flour using a polymer named poly (glycidyl methacrylate-co-styrene) (PGS). To do this, poly (glycidyl methacrylate-co-styrene) (PGS) emulsions were synthesized through a free radical initiated emulsion polymerization of glycidyl methacrylate (GMA) and styrene. The PGS was characterized with FTIR, and investigated as a curing agent for soybean flour (SF)-based wood adhesives. Seven-ply plywood panels were prepared with the SF-PGS adhesives and were evaluated for their water resistance through a three-cycle water-soaking test. Effects of the PGS/SF weight ratios, hot press temperature, hot press time, and usage of NaOH on the water resistance of the resulting plywood panels were investigated. Plywood panels made with the SF-PGS adhesives met the industrial requirement for interior plywood. More information about this research can be found in [4].

In another study, Yahya was able to develop a cold-set wood adhesive based on soy protein isolate. This adhesive was able to pass all the standard requirements for exterior plywood such as the two-cycle boil test, dry shear test, and cyclic-boil shear test. Now, Yahya is working to modify this cold-set adhesive for manufacturing of cross-laminated timber (CLT) panels, which are a novel wood product recently introduced to the construction industry and it is expected to grow very fast.

While Yahya is not personally involved in the translation of his research into industry practices, the ultimate goal would be for these soy-based adhesives to be widely used by the wood composite industry reducing widespread exposure to toxic chemicals.

Following passion with purpose

Yahya enjoying one of Oregon’s many waterfalls at Silver Falls State Park.

Yahya is an engineer by trade and began his career in polymer engineering when obtaining his Bachelor of Science and Master of Science at the Islamic Azad University (IAU)in Tehran, Iran. (Fun fact: IAU is the fifth largest university in the world based on an enrollment of over 1.5 million students!?) Yahya hopes to one-day have a faculty position where he can continue conducting polymer research on meaningful projects.

Join us on Sunday, October 14 at 7 PM on KBVR Corvallis 88.7 FM or stream live to learn more about Yahya’s quest to find a safe, sustainable wood adhesive alternative and his journey to graduate school at Oregon State.

[1] Jalili MM, Pirayeshfar AS, Mousavi SY (2012) A comparative study on viscoelastic properties of polymeric composites measured by a longitudinal free vibration non-destructive test and dynamic mechanical thermal analysis. Iran Polym J 21:651–659. DOI: 1

[2] Jalili MM, Mousavi SY, Pirayeshfar AS (2014) Investigating the acoustical properties of carbon fiber-, glass fiber- and hemp fiber-reinforced polyester composites. Polym Compos DOI: 10.1002/pc.22872.

[3] Jalili MM, Mousavi SY, Pirayeshfar AS (2014) Flexural free vibration as a non-destructive test for evaluation of viscoelastic properties of polymeric composites in bending direction. Iran Polym J (2014) 23: 327. DOI: 10.1007/s13726-014-0227-x.

[4] Mousavi SY, Huang J, Li K (2018) Investigation of poly (glycidyl methacrylate-co-styrene) as a curing agent for soy-based wood adhesives. Int. J. Adhes. Adhes 82: 67-71, DOI: 10.1016/j.ijadhadh.2017.12.017.

Stream ecosystems and a changing climate

Examining the effect of climate change on stream ecosystems

Oak Creek near McDonald Dunn research lab. The salamander and trout in the experiments were collected along this stretch of creek.

As a first year Master’s student in the lab of Ivan Arismendi, Francisco Pickens studies how the changing, warming climate impacts animals inhabiting stream ecosystems. A major component of stream ecosystem health is rainfall. In examining and predicting the effects of climate change on rainfall, it is important to consider not only the amount of rainfall, but also the timing of rainfall. Although a stream may receive a consistent amount of rain, the duration of the rainy season is projected to shrink, leading to higher flows earlier in the year and a shift in the timing of the lowest water depth. Currently, low flow and peak summer temperature are separated by time. With the shortening and early arrival of the rainy season, it is more likely that low flow and peak summer temperature will coincide.

A curious trout in one of the experimental tanks.

Francisco is trying to determine how the convergence of these two events will impact the animals inhabiting streams. This is an important question because the animals found in streams are ectothermic, meaning that they rely on their surrounding environment to regulate their body temperature. Synchronization of the peak summer temperature with the lowest level of water flow could raise the temperature of the water, profoundly impacting the physiology of the animals living in these streams.

How to study animals in stream ecosystems?

Salamander in its terrestrial stage.

Using a simulated stream environment in a controlled lab setting, Francisco studies how temperature and low water depth impact the physiology and behavior of two abundant stream species – cutthroat trout and the pacific giant salamander. Francisco controls the water temperature and depth, with depth serving as a proxy for stream water level.

Blood glucose level serves as the experimental readout for assessing physiological stress because elevated blood glucose is an indicator of stress. Francisco also studies the animals’ behavior in response to changing conditions. Increased speed, distance traveled, and aggressiveness are all indicators of stress. Francisco analyzes their behavior by tracking their movement through video. Manual frame-by-frame video analysis is time consuming for a single researcher, but lends itself well to automation by computer. Francisco is in the process of implementing a computer vision-based tool to track the animals’ movement automatically.

The crew that assisted in helping collect the animals: From left to right: Chris Flora (undergraduate), Lauren Zatkos (Master’s student), Ivan Arismendi (PI).

Why OSU?

Originally from a small town in Washington state, Francisco grew up in a logging community near the woods. He knew he wanted to pursue a career involving wild animals and fishing, with the opportunity to work outside. Francisco came to OSU’s Department of Fisheries and Wildlife for his undergraduate studies. As an undergrad, Francisco had the opportunity to explore research through the NSF REU program while working on a project related to algae in the lab of Brooke Penaluna. After he finishes his Master’s degree at OSU, Francisco would like to continue working as a data scientist in a federal or state agency.

Tune in on Sunday, June 24th at 7pm PST on KBVR Corvallis 88.7 FM, or listen live at kbvr.com/listen. Also, check us out on Apple Podcasts!

Agroforestry: any takers?

Agroforestry, the practice of growing crops or tending livestock while purposefully managing trees on the same parcel of land, can provide security of fuel wood and food in rural areas of the developing world. Increased access to healthcare in many African countries has spurred population growth over the past couple of decades. Malnourishment remains a problem, and as the number of people per acre of farmland increases, maintaining food security may require changes in agricultural practices.

As a second-year PhD student in the Forest Ecosystems and Society department in the College of Forestry, Sonia Bruck knows this isn’t a simple task. Communities around the world who are exposed to agroforestry practices tend to adopt them at low rates, which often depend on residents’ wealth and education. Working with the World Agroforestry Centre (ICRAF), a non-governmental organization in Kenya, Sonia will travel to the town of Mbola in the Uyui district of eastern Tanzania in September. She will be living there for seven months, examining how and why these and other factors might play a role in how people decide to adopt agroforestry practices. A Tanzanian regional office of ICRAF has already promoted the intercropping of pigeon pea and cassava with Gliricidia sepium (a nitrogen fixing tree), but despite this being a biologically sound strategy, it hasn’t caught on among everyone in Mbola. So if there are cultural or socioeconomic barriers to adopting these techniques, she wants to know about them.

An agroforestry system in North Carolina – Longleaf pine alley cropping, where corn and soybeans were alternated near an open agricultural field.

Knowing that wealthier villagers are able to place more risk into implementing a new agroforestry technique might be only one facet. Health, household division of labor, number of children per household, and access to food may also factor into whether people decide to adopt this strategy. Sonia is developing a quantitative survey to gather data like these, and plans to administer it to 600 residents once she arrives in Mbola. She will then analyze the survey data and schedule focus groups to allow residents to provide more context, especially if there are relationships between variables that don’t seem to make sense. According to rational choice theory, we’re all rational actors – so Westerners like us might be missing important cultural preferences that could guide farmers’ agricultural decisions in rural Tanzania. Sonia hopes that her findings will help ICRAF target households that could benefit from implementing agroforestry.

(From left to right) Jeremais Mowo (Regional Coordinator for Eastern and Southern Africa), Sonia Bruck, and Badege Bishaw (her adviser) at ICRAF.

When Sonia departs for Tanzania, she certainly will not be a stranger to international travel. Her father, a professor of plant pathology, taught a field course in the Peruvian Amazon, and she first got to tag along as a fourteen-year-old. The heat, humidity, and occasional threat of vampire bats didn’t seem to deter her when she studied abroad for a summer in Brazil, as an undergraduate at Appalachian State University majoring in Sustainable Development and Environmental Studies. She has also traveled extensively across Central and South America, and recently to the Philippines, Thailand, and Nepal to catch up with friends stationed in the Peace Corps and learn more about local cultures.

Sonia near Silver Falls, Oregon

To hear more about Sonia’s research and experiences traveling and living abroad, be sure to tune in to KBVR Corvallis 88.7 FM this Sunday May, 27 at 7 pm, stream the live interview at kbvr.com/listen, or find it in podcast form next week on Apple Podcasts.

If you’re interested in participating in agroforestry in the Pacific Northwest please visit: http://pnwagro.forestry.oregonstate.edu/

Comunicación Científica con Franco

Kristen Finch interviewing Francisco Guerrero for this special episode. (Photo by Adrian Gallo)

This week on Inspiration Dissemination we will be featuring a previous guest: Francisco Guerrero, a PhD student in the Department of Forest Engineering, Resources, and Management. Francisco’s first interview aired on October 18, 2015, and we called him back for a follow-up because he has been selected for the American Association for the Advancement of Science (AAAS) Mass Media Science and Engineering Fellowship. As a fellow, Franco will be writing feature stories about climate change and health for CNN en Español. Part of the fellowship will involve helping with film production, as well. FUN FACT last time Franco was on the show, he told us that he always wanted to be a movie producer. Franco will take this amazing opportunity during the final push for his PhD research to enhance his science communication skills and gain experience in production and video broadcasting.

This special interview will begin at 6:30 pm on May 6, 2018. We will be asking Franco about the application process, his responsibilities as a fellow, and his goals for the fellowship. After our interview with Franco, we will rebroadcast his first interview on Inspiration Dissemination at 7 pm.

Tune in to KBVR Corvallis 88.7 FM at 6:30 pm to hear about the AAAS Fellowship and learn about Franco’s research in the College of Forestry. Not a local listener? No sweat! Stream the show live on line or hear the podcast next week.

Franco wants to hear from you! Tweet him with ideas for CNN Español, specifically stories about Climate Change and Health. @fjguerrerob

The folks behind the episode: Francisco Guerrero, Kristen Finch, and Lillian Padgitt-Cobb. (Photo by Adrian Gallo)

Ways and Means: Attitudes Toward Methods of Restoring American Chestnut Trees

“The Christmas Song” or “Chestnuts Roasting on an Open Fire” by Bob Wells and Mel Tormé is an iconic song in American culture, but most Americans will never experience a chestnut roast (at least not with American chestnuts).

A mighty blight

The American chestnut was a widespread North American native tree that covered nearly 200,000 miles of Appalachian forest. In 1904, the American chestnut trees in the Bronx Zoo were dying from a then unknown disease, Chestnut Blight. In the next forty years, Chestnut Blight spread across the estimated 4 billion American chestnut trees. Now American Chestnut trees are seen only as giant stumps, juveniles never reaching maturity, and rarely, adult fruit-bearing trees.

Since the decline of the American chestnut, Appalachian forests have changed. Chestnuts have been replaced by oaks, and it is likely that many organisms that relied on the chestnut trees for food or shelter have had to adapt to new conditions or have been displaced. The loss of the chestnut also led to the loss of financial income for many Appalachian people. In addition to chestnuts as a food source, the American chestnut provided decay resistant timber and tannins for tanning hide. The American chestnut and its decline is remembered through oral and written history. Members of older generations from Appalachia tell stories of enormous trees and later forests of white wooden chestnut skeletons.

Restoring the chestnut

Josh skiing in the mountains of Big Sky, Montana.

The restoration of the chestnut is an active project that faces many challenges. First, few Americans have seen an American chestnut tree, and few are familiar with their decline via Chestnut Blight. Since the restoration of the American chestnut would require policy changes and action across 200,000 miles, spanning multiple state governments, it is necessary to assess the extent the public might disfavor or favor this restoration. Our guest this week,Josh Petit from Forest Ecosystems and Society, is seeking to understand the attitudes of Americans toward the chestnut restoration. In particular, Josh is surveying a sample of the US population to compare attitudes toward a controversial method of chestnut restoration, the use of genetic engineering.

Ways and Means

You may be familiar with genetic engineering to modify the genome of an organism to achieve a specific goal. Many of the crops we eat have in some way been modified to aid harvest, growth, and/or resistance to pests and disease. The methods for restoring the American chestnut are:

Selective breeding with related, blight-resistant Asian chestnuts
Modifying the genome of American chestnuts with Asian or other related chestnut genes (cisgenics)
Modifying the genome of American chestnuts with foreign genes or genes from wheat (transgenics)

Josh conducting research during a study abroad program in tropical North Queensland, Australia.

It is important to assess the attitudes of the public to transgenics because the introduction of genes from wheat has been the most successful method at enhancing resistance toward chestnut blight. Recently, negative media has led to the misunderstanding that genetically modified organisms (GMOs) have adverse effects on consumers (humans) and ecosystems. However, these claims are not based in sound science and have been refuted. Although GMOs are being supported as alternatives to crop and forest species extinction, ultimately chestnut restoration relies on majority vote in favor or against a specific strategy. Thus, assessing attitudes toward restoration methods is tantamount to restoration efforts.

The Guy for the Job

A native of Ohio, Josh Petit attended Xavier University and majored in Political Science. He credits a Semester at Sea for broadening his world view and exposing him to different cultures. He learned that culture is important in all aspects of daily life. In retrospect, perhaps it is no surprise that he is currently studying an iconic tree and how culture has driven attitudes toward its restoration.

Josh participating in a Fijian traditional village celebration and homestay–taking turns playing guitar.

Josh became interested in ecology, biology, and the interface of the two with humans while working for Q4 International Marketing an ecotourism company in Panama. This lead him to pursue a Master’s in Natural Resources with a marine ecology focus from Virginia Tech. However, his most recent work withOregon Parks and Recreation Department lead him to pursue a PhD at Oregon State University. With the State Parks, Josh conducted surveys in Oregon Parks and sought to connect behavior, impacts, and social science to ecology and recreation. Now at Oregon State University, Josh is working with Mark Needham andGlenn Howe to understand the drivers of attitudes toward using biotechnologies for restoring American chestnut trees.

Hear more about Josh’s research and his journey to now this week on Inspiration Dissemination. Tune in to KBVR Corvallis 88.7FM on Sunday July, 30 at 7 pm, or live stream the show.

Horse Farms to Tree Farms: Studying the Relationship Between Land Management and Biodiversity

If you wander forests of the Oregon Coast Range you might encounter a strange sight: exclosures made of timber and steel-braided wire, standing in a clear-cut forest. These exclosures, which stand 100-feet long, 50-feet wide and 8-feet high, are the research and work of Thomas Stokely, a PhD candidate in the department of Forest Ecosystems & Society in the College of Forestry. The exclosures were constructed to study the impact of deer and elk grazing on tree growth, and to address a larger research question in forestry management: What does intensive forest management mean for biodiversity?

Completion of exclosure construction in the Oregon Coast Range

Completion of exclosure construction in Oregon Coast Range

To study the impact of deer and elk on commercial tree growth, Thomas constructed constructed 28 stands in which a team of researchers manipulated the intensity of herbicide spray treatments in each area (non-sprayed, light, moderate and intensive herbicide treatments). For six years, under the direction of his adviser Matthew Betts, Thomas and has measured plant communities, arthropods, herbivory and plantation development inside these exclosures and in open plots where wildlife is allowed free access.

PhD student, Thomas Stokely cutting fence rows through logging slash and large stumps to construct wildlife exclosures

The exclosure research in the Oregon Coast Range relates to Thomas’s goals as a scientist who’s invested in understanding how industry impacts biodiversity. “As the world population grows, we need more resources,” he said. “We want to value the product, but we also value biodiversity and wildlife habitat. Is there a way we can manage for both timber production and wildlife habitat? If so, what role do biodiversity and wildlife play in the management of natural resources? If management alters biodiversity or excludes wildlife, what are the implications for ecosystem functioning?” These are questions that continue to drive his research and his career path.

Mature Roosevelt elk bulls browsing through a plantation with exclosure in the background

Thomas has been interested in plant-animal interactions and the environment since he was a child. Growing up on a horse farm in southwest Missouri, he watched horses grazing and wondered about their relationship with the habitat in and around the farm. He first considered studying the policy side of humanity’s relationship with the natural world, but political science wasn’t a good fit—he wanted to pursue a more hands-on approach to studying biodiversity. After reading about the reintroduction of wolves in Yellowstone, he knew he wanted to work directly with land and habitat management. He earned a BS in environmental science at University of Missouri before coming to Oregon State. Upon completing his PhD, Thomas plans to work in applied ecology where he hopes to use science to guide land management and conservancy practices.

Tune in to hear our conversation with Thomas Stokely on Sunday, November 13^th at 7:00 pm on 88.7 FM KBVR Corvallis or listen live online.