DNA electrophoresis showing the inserts in eight different (Escherichia coli) clones. We are cloning promoters from Mycobacterium smegmatis which are active in stationary phase.
The Steelcolor Shiner (Cyprinella whipplei) is a common minnow that consumes terrestrial and aquatic insects and is an important player in regulating nutrient dynamics in stream ecosystems.
Habitat assessment and inventories of small mammal populations.
Reconstructing the paleoenvironment of northwestern Botswana by comparing indigenous species with fossil material excavated from two cave systems.
The orangethroat darter (Etheostoma spectabile) is a common darter that consumes benthic grazing invertebrates affecting a stream primary productivity and creating a trophic cascade within an aquatic ecosystem.
A collaboration with Dr. Howard K. Reinert at the College of New Jersey to investigate habitat use of the Boa constrictor which has recently invaded the island of Aruba. Potential niche overlap could become a concern for the conservation of the endangered Aruba Island Ratttlesnake.
Rhodobacter sphaeroides, a purple photosynthetic bacteria, whose genome has been completely sequenced and fully annotated.
Methyl green agar plates for examining whether microorganisms synthesize and secrete DNAse enzymes which degrade extracellular DNA for nutrient acquisition.
The desert bighorn sheep (Ovis canadensis nelsoni) of California's and Mexico's Peninsular Ranges is a federally listed endangered species. Physiological adaptations allowing this large mammal to survive desert conditions are studied in Turner's lab.
A chromatogram of DNA sequences from various clones.
A gregarine (Nubenocephalus secundus) parasitizing the midgut epithelium of the blue-ringed dancer (Argia sedula). This is one of many new gregarine species described from an investigation for the biodiversity of these aquatic insect parasites.
T. Cook Lab
Parental feeding rates to nestlings are monitored at nests of Carolina Wrens as part of a study on parental investment strategies.
A unicellular bi-flagellated alga (Chlamydomonas reinhardtii) is a model organism for studying the inctracellular signaling mechanisms that control movement of eukaryotic cilia and flagella.
A genus of parasitic plants (Harveya) depends entirely on its hosts for water, minerals, and photosynthates. Such plants are of unique interest in molecular evolution and systematics.
A fossil jaw of a gerbil lying outside of Gcwhihaba cave, Botswana. Gerbils are important indicators for paleoenvironmental reconstruction in the region.
A radio-tracked female Northern Cardinal as part of a study on extra-pair mating strategies.
The white-tailed deer persists in historic home ranges despite encroaching development. Studies of urbanization influences fecundity, distribution, enzootic and epizootic disease, and parasites are of interest.
Chromatophore is the photosynthetic apparatus of R. sphaeroides which allows this organism to harvest light energy.
Female timber rattlesnakes (Crotalus horridus) demonstrate seasonal differences in baseline and stress-induced hormone responses due to reproductive condition. Corticosterone is significantly higher in gravid females due to stressors related to reproduction.
By examining what causes variation in modern African rodents, like this gerbil, we can better understand how environments have changed where we find their fossil ancestors.
A population of Chlamydomonas reinhardtii cells exhibiting phototaxis, migration toward light. Some pharmacological agents inhibit phototaxis by inhibiting flagellar motility of the cells.
Species-specific mange mite recorded for the first time in Texas from 6-year-old male white-tailed deer. Infection of the deer may be related to effects of crowding in rural/urban deer herds.
The southern redbelly dace (Phoxinus erythrogaster) is a common stream minnow that consumes benthic algae, playing an important role in the regulation of periphyton biomass in small headwater streams.
Male Northern Cardinals are banded and measured as part of a study of extra-pair mating behavior.
We are investigating the reproductive timing and potential of the Boa constrictor which has recently invaded the island of Aruba and has become a concern for the conservation efforts of the endangered Aruba Island Rattlesnake.
Distribution, abundance, and reproduction of rural/urban deer herds are a growing concern in southeast Texas. Habitat impacts relative to human encroachment and high deer populations are being studied by Turner's lab.
A large lineage of small moths (Gelechioidea) remains poorly known in the Nearctic, with only 30% of its species described. Modern morphological and molecular systematics are used with behavioral and ecological data to study and infer systematic relationships.
A gregarine (Nubenocephalus secundus) parasitizing the intestine of the blue-ringed dancer (Argia sedula) by attaching to the epithelium with a long slender epimerite and a wide "suction cup"-like protomerite at its anterior.
T. Cook Lab
The reptile fauna from northwestern Botswana, including this chameleon, is helping us better understand how and why the climate has changed in this region over the last two million years.
This neotropical hemipteran (Neoplea absona) in the family Pleidae was a specimen used to revise the genus. Pleids, or pygmy backswimmers, are predators of micro-crustaceans in stagnant waters.
J. Cook Lab