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Dr. Timothy D. Sherman
Associate Professor,
Department of Biological Sciences
Adjunct Associate Professor,
Department of Marine Sciences
Ph.D., 1988, Biochemistry, Texas A&M University
tsherman@jaguar1.usouthal.edu
Research Description:
Plant cell biology and physiology, especially nutrient uptake
and metabolism in aquatic and marine plants and interactions
of native and exotic introduced plant species.
Research Statement:
I am a broadly trained plant physiologist/biochemist having
worked with algal nitrogen metabolism, herbicide mode of action
and acquired herbicide resistance, and developmental biology
and physiology of parasitic plants.
My current research involve the cell biology
and physiology of nutrient uptake and metabolism in aquatic
and marine plants. Marine and aquatic plants are the source
of most carbon and nitrogen that is added to food chains in
the coastal and freshwater areas, respectively. Macroalgae
and higher plant representatives of these groups have the
additional role of serving as sanctuary for the young of many
animal species that share their habitat.
In spite of their importance in these environments, very little
serious investigation regarding physiology has been performed
in these important plants. I am particularly interested in:
| 1. |
Species forming the large
off-shore seagrass beds along coastal regions of the Gulf
of Mexico |
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| 2 |
Introduced exotic species
that are displacing native species in the upper reaches
of Mobile Bay |
These studies will provide information
concerning nutrient requirements and uptake capacities of
these species, and will help in formulation of management
policy in these commercially and ecologically important areas.
Representative Publications:
T.D. Sherman,
T. W. Barger, J.C. Hoffman & K. C. Vaughn (2002) The radical
appendage of Dodder (Cuscuta pentagona) seedlings. Plant Physiology.
In preparation.
T.D. Sherman,
A. Woodard, and J.J. O'Brien (2002) A sensitive polymerase
chain reaction-based method for the detection of the parasitic
castrator Loxothylacus texanus (Rhizocephala) in tissues of
blue crabs (Callinectes sapidus). J. Crust. Biol. In preparation.
J. Lartigue and T. D.
Sherman (2002) Field assays for measuring nitrate reductase
activity in Enteromorpha sp. (Chlorophyceae), Ulva sp.(Chlorophyceae),
and Gelidium sp. (Rhodophyceae), Journal Phycology, in review.
E.M. Boone, A.B. Boettcher, T.D.
Sherman and J.J. O'Brien (2002) Characterization of
settlement cues used by the Rhizocephalan barnacle, Loxothylacus
texanus. Marine Ecology Progress Series, in review.
J.F. Valentine, E.F. Blythe, S. Madhavan,
T.D. Sherman (2002) Seagrass
responses to stimulated herbivory: Can grazers stimulate nitrogen
uptake and sharing in a shallow water turtlegrass (Thalassia
testudinum) meadow?. Aquatic Bot. : In review.
H. Glenner J.T. HØeg,
J.J. O'Brien and T.D. Sherman (2000) The Invasive vermigon stage in the parasitic barnacles
Loxothylacus texanus and L. panopaei (Sacculinidae): closing
of the rhizocephalan life cycle. Marine Biology. 136: 249-257
T. D. Sherman,
W. T. Pettigrew, and K.C. Vaughn (1999) Structural and immunological
characterization of the Cuscuta pentagona L. chloroplast.
Plant Cell Physiology. 40: 592-603
J. R. Mahan, M. J. Oliver and T.
D. Sherman (1997) Nitrate reductase activity during
desiccation and rehydration of the desiccation-tolerant moss
Tortula ruralis. Environmental and Experimental Botany. 39:
67-76
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