Jeffrey
D. Weidenhamer
Trustees’
Distinguished Professor
Professor
of Chemistry and Chair,
Department
of Chemistry, Geology & Physics
Ashland
University | Ashland, OH 44805 |
E-mail: jweiden@ashland.edu | Phone:
419-289-5281
Current position: I have been a member of the
Chemistry faculty at Ashland since 1989, and currently
chair the Department of Chemistry, Geology
& Physics. I teach General
Chemistry, courses in Analytical Chemistry,
as well as Core science courses including
Science as a Cultural Force and Lead & Civilization.
I previously served as Core Curriculum Director for six years.
Research interests: I have focused
on two main areas of research. First, I
have a longstanding interest in the
development of methods for
the analysis of plant root exudates in soil.
This work has been funded by the Research
Corporation and
the National Science Foundation, and we have developed a new method for soil
analysis using silicone
microtubing placed directly in soil. In
addition, my students and I have conducted investigations of the contamination
of
consumer products with
heavy metals such as lead and cadmium.
This work has resulted in at least 14 recalls by the
Consumer
Product Safety Commission involving more than 1.5 million children’s jewelry
and toys, and has been cited in a
US
Congressional resolution seeking a ban on US export of
electronic waste.
EDUCATION
The
The
TEACHING
General
Chemistry (CHEM 103-104)
Quantitative
Analysis (CHEM 204)
Lead and
Civilization (CHEM 250)
Instrumental
Analysis (CHEM 420)
Science as a
Cultural Force (CHEM/PHIL 350)
RESEARCH
Recent
Grants Received
Bergosh, R., Corbin, P., Mohney, B. and
Weidenhamer, J. (Co-PI)
2009-2012. MRI:
Acquisition of a 400-MHz NMR
Spectrometer, funded by the National Science
Foundation ($319,340)
Weidenhamer, J. 2005-2008. RUI: Measurement of allelochemical
dynamics in the rhizosphere.
Funded by the National Science
Foundation, Division of Environmental Biology, Ecological Biology Cluster
($209,843).
Weidenhamer, J. 2000-2001. Course, Curriculum and Laboratory
Improvement Adaptation and Implementation Grant
from the National
Science Foundation, Division of Undergraduate Education. Drs. Michelle Jones-Wilson and Brian
Mohney were
co-authors. Instrumentation
to enhance an investigative approach to chemistry. $61,298,
matched by an equal
amount by
Invited
Presentations
Weidenhamer, J. August 2009.
Analytical strategies for ecologically active phytochemicals.
Baltimore, MD. Annual
meeting of the Phytochemical
Society of North America
Weidenhamer, J. June 2008.
Lead: An ancient but still
present hazard. Chicago, Illinois
Chapter of the American
Chemical Society.
Weidenhamer, J. August 2008.
Lead: Using a potent neurotoxin
to teach environmental principles.
Philadelphia, PA, National meeting of the American Chemical
Society.
Weidenhamer, J. August 2008.
Diffusive
sampling of the rhizosphere using polydimethylsiloxane
sorbents.
Philadelphia, PA,
National meeting of the American Chemical Society.
Weidenhamer, J. September 2008. Measurement of allelochemical dynamics and movement with polydimethylsiloxane
sorbents. Saratoga Springs, NY, Fifth
World Congress on the International Society of Allelopathy.
Weidenhamer, J. May 2007.
Diffusive
sampling methods for analysis of the rhizosphere. Invited platform presentation.
Presented at the Europe meeting of the Society of Environmental Toxicology and Chemistry
(SETAC), Porto, Portugal.
Weidenhamer, J. 2005.
Measurement of allelochemical dynamics in the rhizosphere. Part of a symposium on
allelopathy at the August joint meeting of the
Ecological Society of America and International Congress on Ecology
in Montreal.
Weidenhamer, J. 2005. Measurement of
allelochemical dynamics in the rhizosphere. Invited plenary lecture at the
Fourth World Congress on Allelopathy, held at
Charles Sturt University in
Weidenhamer, J. 2005. Evaluation of the
allelopathic potential of a mustard cover crop. Invited presentation,
coauthored by Jeanne Durkalski
and Warren Dick of Ohio State University.
Presented at the Fourth World Congress
on Allelopathy, held at Charles Sturt University in Wagga Wagga, Australia.
Weidenhamer,
J. April 2004. Ecological weed management: Lessons from the
International
Conference on the Theory and Practice of Ecological Agriculture, Nanchang,
China.
Weidenhamer,
J. April 2004. Allelopathic mechanisms and
experimental methodology.
International
Symposium on Allelopathy Research and Application.
Weidenhamer,
J. April 2002. Killing off the
competition: Allelopathy in plant communities.
Invited
lecture, Department of Biological Sciences; Mississippi State University.
Weidenhamer,
J. April 2001. Invited lecture on Chemical interference in
plant communities,
Selected
Publications Request a copy
Over 30 publications on allelopathy and
chemical education, including (* indicates undergraduate co-author):
Mohney, B., Matz,
T.*, LaMoreaux, J.*, Wilcox, D.*, Gimsing,
A., Mayer, P. and J. Weidenhamer. 2009. In situ silicone tube
microextraction: A
new method for undisturbed sampling of root-exuded thiophenes
from marigold (Tagetes erecta L.) in
soil.
In press, Journal of Chemical Ecology 35(11). DOI:
10.1007/s10886-009-9711-8
Weidenhamer, J., Boes, P.* and D. Wilcox.* 2009.
Solid-phase root zone extraction (SPRE):
A new methodology
for measurement of allelochemical dynamics in
soil. Plant and Soil, 322: 177-186.
DOI: 10.1007/s11104-009-9905-4.
Dayan , F., Howell, J. and Weidenhamer, J. 2009. Dynamic root exudation of sorgoleone and its in planta mechanism of action.
Journal of Experimental Botany, 60, 2107–2117.
Weidenhamer, J. 2008. Lead contamination of inexpensive seasonal and holiday products.
Science of
the Total Environment, 407:
2447-2450. DOI:10.1016/j.scitotenv.2008.11.031
Yost, J.* and J. Weidenhamer.
2008. Accessible and total lead
in low-cost jewelry items.
Integrated Environmental Assessment and
Management, 4:358-361.
Yost, J.* and J. Weidenhamer.
2008. Lead contamination of inexpensive
plastic jewelry.
Science of the Total Environment, 393:348-350.
Weidenhamer, J. 2008.
“Allelopathic mechanisms and experimental methodology.”
Pp. 119-35 In: (R.S. Zeng, A.U. Mallik, and S.M. Luo, eds.) Allelopathy
in Sustainable Agriculture and Forestry
(New
York: Springer Science and Business Media).
Loi, R.*, Solar, M. and J. Weidenhamer.
2007. Solid phase microextraction method for in vivo measurement
of allelochemical uptake.
Journal of Chemical Ecology, 34:70-75.
Weidenhamer, J. and M. Clement.
2007. Widespread lead
contamination of imported low-cost jewelry in
the US. Chemosphere, 67: 961-965.
Weidenhamer,
J. 2007.
New approaches for the analysis of allelochemicals in soil. Allelopathy
Journal,
19(1):
135-142 (Invited review).
Weidenhamer,
J. 2007.
Circuit board analysis for lead by atomic absorption spectroscopy in a
course for non-science
majors. Journal of Chemical Education,
84:1165-1166. Featured
on cover of July issue.
Weidenhamer, J. and M. Clement.
2007. Leaded electronic waste is
a possible source material for lead-contaminated
jewelry. Chemosphere, 69: 1111-1115.
Weidenhamer, J. and M. Clement.
2007. Evidence of recycling of
lead battery waste into highly leaded jewelry.
Chemosphere,
69:1670-1672.
Weidenhamer,
J. 2006.
Distinguishing allelopathy from resource competition: The role of
density.
Pp. 85-103
in Allelopathy: A physiological process
with ecological implications, edited by Manuel Reigosa,
Nuria Pedrol
and Luís González, published by Springer. (Invited review chapter).
Weidenhamer, J. 2005. Biomimetic measurement of allelochemical dynamics in the rhizosphere.
Journal of Chemical Ecology. 31(2): 221-236.
Weidenhamer, J. and J. Romeo.
2005. “Allelopathy as a mechanism
for resisting invasion: The case of
Polygonella
myriophylla.” Pp.
167-177 In: (Inderjit, ed.) Invasive
Plants: Ecological and Agricultural Aspects
(
Lane,
N., J. Weidenhamer and J. Romeo. 2004. Zapoteca
phytotoxicity. Journal of Chemical Ecology 30(2):
425-437.
Weidenhamer,
J and J. Romeo. 2004. Allelochemicals of polygonella
myriophylla: chemistry and soil
degradation. Journal
of Chemical Ecology 30(5):
1067-1082.
Weidenhamer, J. 2001. Chapter 2: Nuevas Metodologías para el Estudio de la
Alelopatía. Pp 69‑97.
In: A.L. Anaya, F.J. Espinosa‑García,
and R. Cruz‑Ortega, editors.
Relaciones químicas entre organismos:
aspectos básicos y perspectivas de su aplicación. Instituto de Ecología, UNAM
y Plaza y Valdés,
S.A. de C.V. México.
Delaney, K.R., Bissett, N., Weidenhamer, J., 1999, "A new species of Carphephorus (Asteraceae; Eupatorieae)
from peninsular
contributor to this work).
Romeo,
J. and J. Weidenhamer. 1998. Bioassays for Allelopathy in Terrestrial
Plants. Pp. 179-211
In K.F. Haynes
and J.G. Millar (eds.), Methods of Chemical Ecology, Volume 2: Bioassay
Methods.
Kluwer Academic Publishers, Norvell,
MA.
Weidenhamer,
J.D. 1996. Distinguishing resource competition and
chemical interference: Overcoming
the methodological
impasse. Agronomy Journal, 88(6):866-875.
Martin,
J.* and J.D. Weidenhamer. 1995. Potassium deficiency increases thiophene production in Tagetes
erecta.
In Phytochemicals and Health, ed. D.L. Gustine and H.E.
Flores. Current
Topics in Plant Physiology, Vol. 15
Thijs, H.*, J.R. Shann and
J.D. Weidenhamer. 1994. The effect of phytotoxins on competitive
outcome in a
model system. Ecology,
75(7):1959-1964.
Weidenhamer,
J., F. Macias, N. Fischer and G. Williamson. 1993.
Just how insoluble are monoterpenes?
Journal of Chemical Ecology, 19(8):1827-1835.
Weidenhamer,
J. and J. Romeo. 1989. Allelopathic properties of Polygonella myriophylla:
Field evidence
and
bioassays. Journal of Chemical Ecology, 15(7):1957-1970.
Williamson,
G. and J. Weidenhamer. 1990. Bacterial degradation of juglone: Evidence against
Allelopathy?
Journal of Chemical Ecology, 16(5):1739-1741.
Weidenhamer,
J., D. Hartnett and J. Romeo. 1989. Density-dependent phytotoxicity:
Distinguishing
resource competition
and allelopathic interference in plants.
Journal of Applied Ecology,
26(2):613-624.