We engage the Portland, Oregon scientific and technical community to enhance the health of the scientific research enterprise, provide opportunities for the next generation of scientists and engineers, and promote the public's understanding of science and technology. We are comprised of faculty and students from several colleges and universities in the Portland area, as well as colleagues in local business, industry, federal and state agencies, and medical centers. We focus many of our programs on enhancing the experiences of students at all levels. Many of our members are retired scientists and engineers who have relocated to the Portland area and find a community of interests through the activities of the chapter.
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Sigma Xi events
Sigma Xi events
31 Oct - 01 Nov 2025: Sigma Xi International Forum for Research Excellence (IFoRE) virtual meeting. Student abstracts on research projects are welcomed. Competing students will be assigned virtual sessions between 18 and 26 Oct 18 for research presentation and judging. Student awards will be given during IFoRE conference sessions. Visit experienceIFoRE.org/students to learn more!
13 Nov 2025, 7:30 pm PST: SX-CW lecture by Glenna Clifton, Natures Machines: what we can learn from marching ants, grasping crabs, and paddling birds. Dundon-Berchtold Hall 031, University of Portland. Details below.
Other science/engineering events
Other science/engineering events
Glenna Clifton
Assistant Professor of Biology, University of Portland
Thursday, 13 November 2025, 7:30 pm PST
Dundon-Berchtold Hall 031
University of Portland
The lecture is free and open to the public.
The lecture will also be remotely accessible via https://uportland.zoom.us/j/6332225915
All animals move, whether to find food, evade predators, or secure a mate. Since moving well can mean life-or death, natural selection has often shaped an animal's anatomy and behavior in relation to their environment. The Clifton Lab studies how and why animals move the way they do. Join for a lively talk highlighting 3 projects currently underway in the lab. You'll learn (1) how recording 1000s of ants walking on bumpy ground inspired a new robotic leg and informs our understanding of ant foraging ecology; (2) how analyzing the shape of crab toes and crab grasping strategies enables a crab-inspired robot to collect debris from the ocean floor; and (3) how investigating the shape of duck webbed feet may reveal foundational principles in the repeated evolution of underwater diving in waterfowl.
Dr. Clifton's talk will be preceded by a presentation by Anna Singley, UP senior and researcher in the Theoretical Biology Group at Los Alamos National Laboratory: Epidemiology on Networks: Geospatial View.
Epidemics unfold across both social and spatial networks, yet most models emphasize one dimension at the expense of the other. Using a combination of graph-theoretic metrics, differential equation models, and spatial data, we investigate how social network features influence outbreak characteristics. The approach bridges individual-level contact networks and population-level geography, offering new insights into how spatial structure modulates epidemic dynamics and how interventions can be better targeted in real-world settings.
Sigma Xi holds a worldwide competition for research grants to students in March and October every year. The next deadline to apply for a grant is 15 Mar 2026. New funding focuses on more grants to women and under-represented minority students.
Recent GIAR awards to local students
Recent GIAR awards to local students
Daniel Sheikh, Geology: Electron Backscatter Diffraction (EBSD) Study of Pink Spinel Anorthosite (PSA) Clasts in Lunar Dimict Breccia Northwest Africa (NWA) 15500: Constraints on PSA Petrogenesis and Shock Deformation History. Mentor: Alex Ruzicka, Portland State University. (2024 March)
I propose to study a new but apparently widespread rock type from the highlands of the Moon using a novel laboratory technique (electron backscatter diffraction, or EBSD). This rock type, called “pink spinel anorthosite” (PSA) because of its composition and mineralogy (>20 vol. % spinel), appears to be widespread in the lunar highlands based on orbital remote sensing data, and was first clearly identified as rock fragments (clasts) in a lunar meteorite, NWA 15500, which I propose to study in more detail. PSA is not produced in the global “magma ocean” thought to have produced the lunar plagioclase-rich (anorthosite) crust, and instead may have formed by impact melting or by magma-wallrock interactions between a hot Mg-rich magma and the anorthosite crust. Either possibility is important, because it would indicate that there are other global processes responsible for creating lunar highland rock types than the magma ocean. As impacts were ubiquitous on the Moon and induced secondary deformation features in lunar materials, the EBSD technique can help constrain the shock deformation history experienced by NWA 15500 and the overall formation process to make PSA. The main objective of the proposed work is to characterize the amount and type of deformation in each PSA clast in NWA 15500 and compare it to that of the surrounding host rock. EBSD is a relatively novel method for lunar geoscience, utilized primarily for assessing deformation in accessory minerals; the results of this study will provide a larger understanding of the deformation in common minerals found in lunar rocks (plagioclase, olivine). The data will be used to constrain the origin of PSA. If PSA originated by magma wallrock interactions that occurred at depth at an early stage of lunar history, it would have to have been excavated from depth by a large impact. This should produce high deformation. If instead PSA originated as an impact melt on the lunar surface, it might be less deformed because the minerals crystallized from a later-formed melt.
George Anim, Geology/Planetary Science: Shock thermal processing of shergottites using evidence for pressure, temperature, and deformation gradient. Mentor: Alexander Ruzicka, Portland State University. (2023 March)
Mars is a key focus for studying planetary evolution and future space exploration. Currently, martian meteorites are the only physical samples available until the Perseverance rover returns with rock samples in 2031. Most martian meteorites are shergottites, which resemble terrestrial basalts.
Shergottites reach Earth through intense asteroid impacts on Mars, leading to changes in the rock known as shock metamorphism. This process obscures the primary textures and chemistry of the rocks, resulting in mineral deformation, the transformation of plagioclase into a glass called maskelynite, molten areas known as shock melt pockets, and the formation of new high-pressure minerals.
Our research uses optical and scanning electron microscope (SEM) techniques to study these shock metamorphic features. Understanding shock metamorphism in these meteorites is crucial for estimating the size of the impact events that ejected them from Mars. Additionally, this knowledge helps us reconstruct the primary textures and features of the rocks, providing a more detailed understanding of the geology and evolution of Mars.
Michelle Ozaki, Cell biology/biochemistry: Postpartum liver fibroblasts in driving liver metastasis in young women’s breast cancer. Mentor: Pepper Schedin, OHSU. (2024 Mar)
Tin-Long Yiu, Physiology/Functional Morphology: The Role of Cerebellar Climbing Fibers in Sensory Discrimination. Mentor: Haining Zhong, OHSU. (2023 Oct)
Sky Button, Cell biology: Using aquatic eDNA to inform the conservation of a rare and secretive terrestrial amphibian. Mentor: Jonah Piovia-Scott, Washington State University Vancouver. (2021 Oct)
Geoff Szafranski, Ecology: Contaminant analysis of coastal mangrove ecosystems across different environmental conditions in Hawaii and Florida. Mentor: Catherine de Rivera, Portland State University. (2021 Oct)
James Frye, Physics and Astronomy: Applications of EBSD Techniques to Constrain Thermal Parameters of Ureilites During Catastrophic Collision. Mentor: Alex Ruzicka, Portland State University. (2021 Oct)
Malcolm Peavy, Systematics / Evolutionary Biology: Vitamin D exploration of the mTOR pathway in Austrofundulus Limnaeus. Mentor: Jason Podrabsky, Portland State University. (2021 Mar)
Robyn Dove, Ecology: The root-nodule microbiome: Implications for invasive legume management. Mentor: Daniel Ballhorn, Portland State University. (2020 Oct)
The Sigma Xi Grants-in-Aid of Research (GIAR) program has funded research by undergraduate and graduate students since 1922. Of the 810 proposals received by the 1 Oct 2018 deadline, grants were earned by 97 applicants from 6 countries, including 17 undergraduate students, 24 master’s students, and 56 doctoral candidates. Collectively, the students received $87,696.
Previous GIARs have been earned by students at Portland State University, University of Portland, Washington State University Vancouver, Willamette University, and Oregon Health & Science University. We encourage students at all academic institutions in the Portland area to apply. Membership in Sigma Xi isn't required, but 75% of the grants are reserved for student members and advisees of faculty who are members.
As part of Women’s History Month, Sigma Xi announced the establishment of the Linda H. Mantel Next Generation Women's Leadership Award. The award includes a $2,500 honorarium and is awarded biennially to an early-career STEM leader who identifies as a woman. The award reflects Dr. Mantel’s legacy of service, generosity, and leadership within Sigma Xi and the research enterprise.
Linda H. Mantel has been a Sigma Xi member since 1964. She spent 25 years at City College of the City University of New York, as a faculty member, chair of the Department of Biology, and assistant provost for Research and Graduate Studies. During this time she was a research associate in the Department of Invertebrates at the American Museum of Natural History. She has served as dean of the faculty and professor of biology at Reed College, as interim vice-president for Academic Administration at Willamette University, as assistant vice-president for Technology Services at the University of Portland, and as associate research professor at Portland State University.
Following her official retirement in 2002, Mantel joined the board of the multi-institutional Columbia-Willamette Chapter of Sigma Xi, where she served as secretary from 2004-2008, and completed 10 years as president. The chapter has won three awards for Excellence and Programs in the last eight years. Mantel joined the Sigma Xi Board as a member of the Diversity Committee in 2003, and was active as a chapter delegate to both the Northwest Region and the Multi-institutional (MI) Constituency. In 2009, Mantel was elected director of the Northwest Region and served two terms, until 2015.
In 2022, in recognition of her distinguished service to our chapter and to the larger organization, Dr. Mantel was designated a Sigma Xi Fellow.
The 2024 winner of the Linda Mantel Award is Adriana Bankston, who has worked to nurture U.S. competitiveness in science and technology through several roles with universities, non-profits and scientific societies. She will begin a new role this fall as the inaugural congressional policy fellow sponsored by the American Society of Gene and Cell Therapy (ASGCT) as part of the prestigious American Association for the Advancement of Science (AAAS) Science & Technology Policy Fellowships Program (STPF). Over the past year, she contributed to policy entrepreneurship with the Federation of American Scientists to make the work of policymakers more impactful and help realize the potential of landmark legislation by assisting the federal government in fostering innovation and U.S. competitiveness. In 2023, she served as Sigma Xi’s senior fellow in civic science & public policy, where she facilitated engagement of scientists in policymaking.
Sigma Xi Chapter of Excellence Award
Sigma Xi Chapter of Excellence Award
Chapter of Excellence Awards are bestowed by Sigma Xi annually for "exceptional chapter activity, innovative programming, and true community leadership." In 2021, the Columbia-Willamette Chapter earned the first-place award; in the past 8 years, the chapter has won 3 awards for excellence or for its programs.
Leroy Sibanda with research poster at Madison
Megan and Nacho with poster at Sigma Xi Stem + Art & Film Festival
November 2019: Sigma Xi Columbia-Willamette provided partial travel support to students Vusumuzi Leroy Sibanda, Megan Hanley, and Dr. Ignacio (Nacho) de la Higuera, enabling them to attend Sigma Xi's Annual Meeting and Student Research Conference in Madison, Wisconsin. In the Conference, Leroy won the first prize, in Chemistry-Graduate Students, for his poster, A mechanistic investigation of peptide S-nitrosation by nitric oxide moieties: implications for biological function. He also represented our chapter as delegate to the Annual Meeting, and later on the same trip, he presented his work at the NOBCChE meeting in St. Louis, Missouri.
Nacho presented his poster Crucifiction: an evolutionary story at the interface between DNA and RNA viruses. Inspired by that research, Megan and Nacho collaborated on a poster and a video at the meeting's STEM + Art & Film Festival.
June 2019: Sigma Xi Columbia-Willamette was pleased to help sponsor Leroy Sibanda's attendance at the AAAS Pacific Division/Sigma Xi joint meeting in Ashland on 19 June 2019. Leroy is a Ph.D. candidate in the Simoyi research group in Portland State University's Chemistry Department, and he won the top student award in Chemistry and Biochemistry for his poster, Vasoactive hormones identified as efficient Nitric Oxide donors: implications for enhanced opioid induced antinociception. Linda Mantel wrote, "As a physiologist myself, I found the poster most enlightening and greatly appreciated Leroy's thorough explanation of the work."
Leroy received this support from SX CW because he won a graduate first place award at our 15th Annual Student Research Symposium in November 2018.
June 2018: the Chapter provided partial travel support for three students to present their research at the Sigma Xi NW/SW + AAAS Pacific Division Student Research Conference, at Cal State Pomona. Brie Tripp won first prize in the Pacific Division's Education Section; Tetiana Korzun won an honorable mention in the Cell and Molecular Biology Section; and Emmanuel Abdul found the Conference "very enriching and a tremendous opportunity to learn what other people are doing. It certainly was an eye-opener and a great learning experience for me as I gained insight into possible applications of my work on Vertically aligned polymer nanostructures functionalized by magnetron sputtering. Sigma Xi made the experience and professional networking with fellow growing scientists possible for me and for this, I am very grateful."
Brie Tripp lecturing at AAASPD/SX meeting
Tetiana Korzun with poster at AAASPD/SX meeting
Similar awards earned earlier by local students at regional and national Sigma Xi meetings are listed in Student Travel Awards.
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