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2004

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Articles 241 - 270 of 418

Full-Text Articles in Biology

Physical Forcing Of Phytoplankton Community Structure And Primary Production In Continental Shelf Waters Of The Western Antarctic Peninsula, Barbara B. Prezelin, Eileen E. Hofmann, Mark A. Moline, John M. Klinck Jan 2004

Physical Forcing Of Phytoplankton Community Structure And Primary Production In Continental Shelf Waters Of The Western Antarctic Peninsula, Barbara B. Prezelin, Eileen E. Hofmann, Mark A. Moline, John M. Klinck

Biological Sciences

Analyses of a multidisciplinary data set, collected in continental shelf waters of the Western Antarctic Peninsula (WAP) during austral summer of January 1993, identified a previously unrecognized forcing mechanism that sets up a physical and chemical structure that supports and assures site-specific diatom-dominated communities and enhanced biological production (Prézelin et al., 2000). This forcing is active when the southern boundary of the Antarctic Circumpolar Current (ACC) flows along the shelf edge, thereby facilitating onshelf bottom intrusions of nutrient-rich Upper Circumpolar Deep Water (UCDW), which then is upwelled or mixed into the upper water column. At times or locations where UCDW …

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The Agathidinae (Insecta: Hymenoptera: Braconidae) Of Sakhalin And The Kuril Islands, Michael J. Sharkey, Daniel J. Bennett Jan 2004

The Agathidinae (Insecta: Hymenoptera: Braconidae) Of Sakhalin And The Kuril Islands, Michael J. Sharkey, Daniel J. Bennett

Faculty Publications

Recent collecting on Sakhalin and the Kuril Islands, during joint U.S., Russian, and Japanese surveys known as the International Kuril and Sakhalin Island Projects, has resulted in range extensions for 10 species in the braconid subfamily Agathidinae and 17 new taxon records for islands in the Kuril chain, Sakhalin, and Moneron. In addition to a check list of the 19 species of Agathidinae presently known to occur on Sakhalin and the Kuril Islands, a generic key and updated keys to the species of Agathis Latreille, 1804, Bassus Fabricius, 1804, and Coccygidium Saussure, 1892 are provided for the region at large …

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Euglandina Rosea (Férussac, 1821) Is Found On The Ground And In Trees In Florida, Elizabeth C. Davis, Kathryn E. Perez, Daniel J. Bennett Jan 2004

Euglandina Rosea (Férussac, 1821) Is Found On The Ground And In Trees In Florida, Elizabeth C. Davis, Kathryn E. Perez, Daniel J. Bennett

Faculty Publications

Euglandina rosea (Ferussac, 1821) is a carnivorous snail native to the southeastern United States, including Florida (Hubricht, 1985; Wolfe and Brooks, 1968). It is known as a ground-dwelling terrestrial snail that feeds on terrestrial gastropods (Burch, 1962; Pilsbry, 1946). Introduced to Hawaii in 1955, it is one of the worst cases of an intended biological control agent attacking non-target species (Cowie, 2001). Exclosures keep it away from consuming remaining endemic snails, including the endangered Achatinella species (Stone, 1999).

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Snake (Colubridae: Thamnophis) Predatory Responses To Chemical Cues From Native And Introduced Prey Species, Stephen J. Mullin, Hélène Imbert, Jennifer M. Fish, Edward L. Ervin, Robert N. Fisher Jan 2004

Snake (Colubridae: Thamnophis) Predatory Responses To Chemical Cues From Native And Introduced Prey Species, Stephen J. Mullin, Hélène Imbert, Jennifer M. Fish, Edward L. Ervin, Robert N. Fisher

Faculty Publications

Several aquatic vertebrates have been introduced into freshwater systems in California over the past 100 years. Some populations of the two-striped garter snake (Thamnophis hammondii) have lived in sympatry with these species since their introduction; other populations have never encountered them. To assess the possible adaptation to a novel prey, we tested the predatory responses of T. hammondii from different populations to different chemosensory cues from native and introduced prey species. We presented chemical extracts from potential prey types and 2 control odors to individual snakes on cotton swabs and recorded the number of tongue flicks and attacks …

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Radio Telemetry And Post-Emergent Habitat Selection Of Neonate Box Turtles (Emydidae: Terrapene Carolina) In Central Illinois, Patrick Forsythe, Beth A. Flitz, Stephen J. Mullin Jan 2004

Radio Telemetry And Post-Emergent Habitat Selection Of Neonate Box Turtles (Emydidae: Terrapene Carolina) In Central Illinois, Patrick Forsythe, Beth A. Flitz, Stephen J. Mullin

Faculty Publications

Although factors influencing turtle offspring prior to nest emergence have received considerable attention by researchers (Gutzke and Crews 1988; Janzen et al. 2000; Packard and Packard 1987), the activity of neonates following their emergence from the nest is poorly understood (but see Burger 1976; Butler and Graham 1995; Keller et al. 1997). Previous field research has produced valuable information on several aspects of neonate ecology for several species (Brewster and Brewster 1991; Butler and Sowell 1996; Janzen 1993). However, a thorough understanding of life history patterns for many species is absent, and some existing information is conflicting (e.g., Congdon et …

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Influence Of Habitat And Number Of Nestlings On Partial Brood Loss In Red-Cockaded Woodpeckers, James R. Mccormick, Richard N. Conner, D. Brent Burt, Daniel Saenz Jan 2004

Influence Of Habitat And Number Of Nestlings On Partial Brood Loss In Red-Cockaded Woodpeckers, James R. Mccormick, Richard N. Conner, D. Brent Burt, Daniel Saenz

Faculty Publications

Partial brood loss in red-cockaded woodpeckers (Picoides borealis) was studied during 2 breeding seasons in eastern Texas. The timing of partial brood loss, group size, number of initial nestlings, number of birds fledged, and habitat characteristics of the group's cavity-tree cluster were examined for 37 woodpecker groups in loblolly- (Pinus taeda) shortleaf (P. echinata) pine habitat and 14 groups in longleaf (P palustris) pine habitat. Partial brood loss occurred slightly more in the loblolly-shortleaf pine habitat than in the longleaf pine habitat, largely because nests in loblolly-shortleaf habitat initially contained more nestlings. …

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Evidence Of Red-Cockaded Woodpecker Nestling Displacement By Southern Flying Squirrels., Brent Burt, James R. Mccormick, Richard N. Conner, Daniel Saenz Jan 2004

Evidence Of Red-Cockaded Woodpecker Nestling Displacement By Southern Flying Squirrels., Brent Burt, James R. Mccormick, Richard N. Conner, Daniel Saenz

Faculty Publications

Red-cockaded Woodpeckers are unique among woodpeckers in that they excavate their roost and nest cavities entirely within living pines. Studies show that there is a propensity for squirrels to use unenlarged cavities, none have shown evidence of Red-cockaded Woodpeckers being killed by southern flying squirrels. However, we report an instance of two nestlings found dead at the base of the nest tree and 3 flying squirrels inside the nest cavity.

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Relationships Between Habitat And Snag Characteristics And The Reproductive Success Of The Brown-Headed Nuthatch (Sitta Pusilla) In Eastern Texas., L. Lynnette Dornak, Brent Burt, Dean W. Coble, Richard N. Conner Jan 2004

Relationships Between Habitat And Snag Characteristics And The Reproductive Success Of The Brown-Headed Nuthatch (Sitta Pusilla) In Eastern Texas., L. Lynnette Dornak, Brent Burt, Dean W. Coble, Richard N. Conner

Faculty Publications

Habitat use and reproductive success of the Brown-headed Nuthatch (Sitta pusilla Latham) were studied in East Texas during the 2001-2002 breeding seasons. We compared nest cavity selection at used and randomly selected non-used areas. Height of nest trees, midstory density, and percent leaf litter were negatively correlated with nest site selection. Brown-headed Nuthatches showed a strong preference for short snags; yet placed their nest cavity entrances near the top ofthe snags. While nuthatches may be selecting for habitats with little or no midstory density, percent of leaf litter in the nest sites is most likely the consequence of frequent burning. …

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Sterol Carrier Protein-2 Directly Interacts With Caveolin-1 In Vitro And In Vivo, Minglong Zhou, Rebecca D. Parr, Anca D. Petrescu, H. Ross Payne, Barbara P. Atshaves, Ann B. Kier, Judith M. Ball, Friedhelm Schroeder Jan 2004

Sterol Carrier Protein-2 Directly Interacts With Caveolin-1 In Vitro And In Vivo, Minglong Zhou, Rebecca D. Parr, Anca D. Petrescu, H. Ross Payne, Barbara P. Atshaves, Ann B. Kier, Judith M. Ball, Friedhelm Schroeder

Faculty Publications

HDL-mediated reverse-cholesterol transport as well as phosphoinositide signaling are mediated through plasma membrane microdomains termed caveolae/lipid rafts. However, relatively little is known regarding mechanism(s) whereby these lipids traffic to or are targeted to caveolae/lipid rafts. Since sterol carrier protein-2 (SCP-2) binds both cholesterol and phosphatidylinositol, the possibility that SCP-2 might interact with caveolin-1 and caveolae was examined. Double immunolabeling and laser scanning fluorescence microscopy showed that a small but significant portion of SCP-2 colocalized with caveolin-1 primarily at the plasma membrane of L-cells and more so within intracellular punctuate structures in hepatoma cells. In SCP-2 overexpressing L-cells, SCP-2 was detected …

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Growth Rates, Survivorship, And Sex Ratios Of Juniperus Virginiana On The New Jersey Piedmont From 1963 To 2000, James A. Quinn, Scott J. Meiners Jan 2004

Growth Rates, Survivorship, And Sex Ratios Of Juniperus Virginiana On The New Jersey Piedmont From 1963 To 2000, James A. Quinn, Scott J. Meiners

Faculty Research & Creative Activity

Growth rates, survivorship, and sex ratios of Juniperus virginiana on the New Jersey Piedmont from 1963 to 2000. J. Torrey Bot. Soc. XXX:000–000. 20XX.—Studies of the growth, survival, and sex ratios of dioecious species have been predominantly short-term. This research investigated growth rates, survivorship, and sex ratios among cohorts of Juniperus virginiana L. from 1963 through 2000. Males (M) and females (F) in six old-fields of different ages on the New Jersey Piedmont were analyzed, starting with the initial data on height and sex expression collected by John Small on labeled recruits from 1963 through 1976. These plants were relocated …

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Demographics And The Ecological Role Of The Channel Catfish (Ictalurus Punctatus) In Commercially Exploited And Unexploited Reaches Of The Wabash River With Implications For The Flathead Catfish (Pylodictis Olivaris), Robert E. Colombo Jan 2004

Demographics And The Ecological Role Of The Channel Catfish (Ictalurus Punctatus) In Commercially Exploited And Unexploited Reaches Of The Wabash River With Implications For The Flathead Catfish (Pylodictis Olivaris), Robert E. Colombo

Faculty Research & Creative Activity

Catfish are a major component of the Wabash River fish assemblage and are commercially fished below river kilometer (Rkm) 500. From Rkm 322 through 499 the commercial fishery is subjected only to Indiana fishing regulations. In this reach of river, there is a 254-mm minimum total length limit on both sport and commercially harvested catfish. Below RM 322, the Wabash River forms the state boundary of Indiana and Illinois. In this region of river there are two different length limits on commercially harvested catfish with Indiana having a 254-mm length limit and Illinois having a 381-mm length limit. There is …

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Noteworthy Collections: Florida, Barbara S. Carlsward, J Richard Abbott Jan 2004

Noteworthy Collections: Florida, Barbara S. Carlsward, J Richard Abbott

Faculty Research & Creative Activity

No abstract provided.

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High Levels Of Fluctuating Asymmetry In Populations Of Apodemus Flavicollis From The Most Contaminated Areas In Chornobyl, Taras K. Oleksyk, James M. Novak, James R. Purdue, Sergiy P. Gashchak, Michael H. Smith Jan 2004

High Levels Of Fluctuating Asymmetry In Populations Of Apodemus Flavicollis From The Most Contaminated Areas In Chornobyl, Taras K. Oleksyk, James M. Novak, James R. Purdue, Sergiy P. Gashchak, Michael H. Smith

Faculty Research & Creative Activity

Random deviations from the perfect symmetry of normally bilaterally symmetrical characters for an individual with a given genotype occur during individual development due to the influence of multiple environmental factors. Fluctuating asymmetry (FA) is often used as a measure of developmental instability, and can be estimated as the variance of the distribution of differences between the left and right sides. We addressed the question of whether levels of FA were elevated in radioactively contaminated populations living around Chornobyl compared to those in reference populations of the yellow-necked mouse (Apodemus flavicollis). In addition, we studied amounts of directional asymmetry (DA) when …

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Respiratory And Reproductive Characteristics Of Eastern Mosquitofish (Gambusia Holbrooki) Inhabiting A Coal Ash Settling Basin, B. P. Staub, W. A. Hopkins, James Novak, J. D. Congdon Jan 2004

Respiratory And Reproductive Characteristics Of Eastern Mosquitofish (Gambusia Holbrooki) Inhabiting A Coal Ash Settling Basin, B. P. Staub, W. A. Hopkins, James Novak, J. D. Congdon

Faculty Research & Creative Activity

No abstract provided.

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Review Of Encyclopedic Dictionary Of Plant Breeding And Related Subjects, Henry R. Owen Jan 2004

Review Of Encyclopedic Dictionary Of Plant Breeding And Related Subjects, Henry R. Owen

Faculty Research & Creative Activity

No abstract provided.

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Noteworthy Collections: Florida, Barbara Carlsward, J Abbott Jan 2004

Noteworthy Collections: Florida, Barbara Carlsward, J Abbott

Faculty Research & Creative Activity

No abstract provided.

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Growth Rates, Survivorship, And Sex Ratios Of Juniperus Virginiana On The New Jersey Piedmont From 1963 To 2000, James Quinn, Scott Meiners Jan 2004

Growth Rates, Survivorship, And Sex Ratios Of Juniperus Virginiana On The New Jersey Piedmont From 1963 To 2000, James Quinn, Scott Meiners

Faculty Research & Creative Activity

Growth rates, survivorship, and sex ratios of Juniperus virginiana on the New Jersey Piedmont from 1963 to 2000. J. Torrey Bot. Soc. XXX:000–000. 20XX.—Studies of the growth, survival, and sex ratios of dioecious species have been predominantly short-term. This research investigated growth rates, survivorship, and sex ratios among cohorts of Juniperus virginiana L. from 1963 through 2000. Males (M) and females (F) in six old-fields of different ages on the New Jersey Piedmont were analyzed, starting with the initial data on height and sex expression collected by John Small on labeled recruits from 1963 through 1976. These plants were relocated …

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New Taxa And New Combinations In North American Cirsium (Asteraceae: Cardueae), David J. Keil Jan 2004

New Taxa And New Combinations In North American Cirsium (Asteraceae: Cardueae), David J. Keil

Biological Sciences

Six new varieties are proposed in North American Cirsium (Asteraceae: Cardueae): C. arizonicum (A. Gray) Petrak var. tenuisectum D.J. Keil var. nov., C. eatonii (A. Gray) B.L. Rob. var. viperinum D.J. Keil, var. nov., C. edule Nutt. var. wenatchense D.J. Keil, var. nov., C. occidentale (Nutt.) Jeps. var. lucianum D.J. Keil, var. nov., C. scariosum Nutt. var. robustum D.J. Keil, var. nov., C. scariosum Nutt. var. toiyabense D.J. Keil, var. nov. Additionally, twenty new combinations are presented: C. arizonicum (A. Gray) Petrak var. bipinnatum (Eastw.) D.J. Keil, comb. nov., C. arizonicum (A. Gray) Petrak var. chellyense (R.J. Moore & Frankton) …

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Biogeochemical Impact Of Summertime Coastal Upwelling On The New Jersey Shelf, Scott Glenn, Robert Arnone, Trisha Bergmann, Paul W. Bissett, Michael Crowley, Jay Cullen, Joe Gryzmski, Dale Haidvogel, Josh Kohut, Mark A. Moline, Mathew Oliver, Cris Orrico, Robert Sherrell, Tony Song, Alan Weidemann, Robert Chant, Oscar Schofield Jan 2004

Biogeochemical Impact Of Summertime Coastal Upwelling On The New Jersey Shelf, Scott Glenn, Robert Arnone, Trisha Bergmann, Paul W. Bissett, Michael Crowley, Jay Cullen, Joe Gryzmski, Dale Haidvogel, Josh Kohut, Mark A. Moline, Mathew Oliver, Cris Orrico, Robert Sherrell, Tony Song, Alan Weidemann, Robert Chant, Oscar Schofield

Biological Sciences

The alternative hypothesis that observed regions of recurrent hypoxia on the New Jersey inner shelf are more related to coastal upwelling than riverine inputs of nutrients was investigated through a series of multidisciplinary research programs beginning in 1993. The largest variations in ocean temperatures along the New Jersey coast, other than seasonal, are found to be caused by episodic summertime upwelling events driven by southwesterly winds associated with the atmospheric Bermuda High. Off the southern coast of New Jersey, topographic variations associated with ancient river deltas cause upwelled water to evolve into an alongshore line of recurrent upwelling centers that …

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Seasonal Steroid Hormone Levels And Their Relation To Reproduction In The Western Diamond-Backed Rattlesnake, Crotalus Atrox (Serpentes: Viperidae), Emily N. Taylor, Dale F. Denardo, David H. Jennings Jan 2004

Seasonal Steroid Hormone Levels And Their Relation To Reproduction In The Western Diamond-Backed Rattlesnake, Crotalus Atrox (Serpentes: Viperidae), Emily N. Taylor, Dale F. Denardo, David H. Jennings

Biological Sciences

We report seasonal variation in steroid hormone levels in blood samples from free-ranging Western Diamond-backed Rattlesnakes (Crotalus atrox), and the relationship between these hormones and events in the reproductive cycle. At a field site in the Sonoran Desert of south-central Arizona, we collected monthly blood samples over the course of two active seasons from 17 radiotelemetered females, and over three active seasons from 103 randomly encountered males. We used radioimmunoassay to measure plasma levels of 17β-estradiol, progesterone, corticosterone, and testosterone in samples from females, and corticosterone and testosterone in samples from males. Non-reproductive females have consistently low levels …

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Bioinformatic Approaches For Objective Detection Of Water Masses On Continental Shelves, Mark A. Moline, Matthew J. Oliver, Scott Glenn, Josh T. Kohut, Andrew J. Irwin, Oscar M. Schofield, Paul W. Bissett Jan 2004

Bioinformatic Approaches For Objective Detection Of Water Masses On Continental Shelves, Mark A. Moline, Matthew J. Oliver, Scott Glenn, Josh T. Kohut, Andrew J. Irwin, Oscar M. Schofield, Paul W. Bissett

Biological Sciences

As part of the 2001 Hyper Spectral Coupled Ocean Dynamics Experiment, sea surface temperature and ocean color satellite imagery were collected for the continental shelf of the Mid-Atlantic Bight. These images were used to develop a water mass analysis and classification scheme that objectively describes the locations of water masses and their boundary locations. This technique combines multivariate cluster analysis with a newly developed genetic expression algorithm to objectively determine the number of water types in the region on the basis of ocean color and sea surface temperature measurements. Then, through boundary analysis of the water types identified, the boundaries …

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Sex–Specific Effects Of Carotenoid Intake On The Immunological Response To Allografts In Guppies (Poecilia Reticulata), Gregory F. Grether, Shinji Kasahara, Gita R. Kolluru, Edwin L. Cooper Jan 2004

Sex–Specific Effects Of Carotenoid Intake On The Immunological Response To Allografts In Guppies (Poecilia Reticulata), Gregory F. Grether, Shinji Kasahara, Gita R. Kolluru, Edwin L. Cooper

Biological Sciences

Rarely are the evolutionary origins of mate preferences known, but, recently, the preference of female guppies (Poecilia reticulata) for males with carotenoid‐based sexual coloration has been linked to a sensory bias that may have originally evolved for detecting carotenoid‐rich fruits. If carotenoids enhance the immune systems of these fishes, as has been suggested for other species, this could explain the origin of the attraction to orange fruits as well as the maintenance of the female preference for orange males. We used the classic immunological technique of tissue grafting to assay a component of the immune response of guppies …

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Individual Colour Patches As Multicomponent Signals, Gregory F. Grether, Gita R. Kolluru, Karen Nersissian Jan 2004

Individual Colour Patches As Multicomponent Signals, Gregory F. Grether, Gita R. Kolluru, Karen Nersissian

Biological Sciences

Colour patches are complex traits, the components of which may evolve independently through a variety of mechanisms. Although usually treated as simple, two-dimensional characters and classified as either structural or pigmentary, in reality colour patches are complicated, three-dimensional structures that often contain multiple pigment types and structural features. The basic dermal chromatophore unit of fishes, reptiles and amphibians consists of three contiguous cell layers. Xanthophores and erythrophores in the outermost layer contain carotenoid and pteridine pigments that absorb short-wave light; iridophores in the middle layer contain crystalline platelets that reflect light back through the xanthophores; and melanophores in the basal …

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Serpentine: A Model Habitat For Botanical Research In Sri Lanka, Nishanta Rajakaruna, Alan J. M. Baker Jan 2004

Serpentine: A Model Habitat For Botanical Research In Sri Lanka, Nishanta Rajakaruna, Alan J. M. Baker

Biological Sciences

Serpentine (ultramafic) outcrops are found in most parts of the world and for many years have attracted the attention of soil scientists and plant biologists alike due to the unusual nature of both the substrate and the life forms they harbour. In this paper, we introduce serpentine outcrops as a model habitat for botanical studies and review preliminary findings of a recently conducted soil and floristic survey of four of the five known serpentine outcrops in Sri Lanka. We hope that this paper will stimulate much-needed studies, both exploratory and experimental, and point to the immediate need for conservation of …

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Epidemiology, Pathogenesis, And Prevention Of Foodbome Vibrio Parahaemolyticus Infections, P.S. Marie Yeung, Kathryn J. Boor Jan 2004

Epidemiology, Pathogenesis, And Prevention Of Foodbome Vibrio Parahaemolyticus Infections, P.S. Marie Yeung, Kathryn J. Boor

Biological Sciences

Since its discovery about 50 years ago, Vibrio parahaemolyticus has been implicated as a major cause of foodborne illness around the globe. V. parahaemolyticus is a natural inhabitant of marine waters. Human infections are most commonly associated with the consumption of raw, undercooked or contaminated shellfish. A few individual V. parahaemolyticus virulence factors, including the thermostable direct hemolysin (TDH) and TDH-related hemolysin (TRH), have been investigated in depth, yet a comprehensive understanding of this organism's ability to cause disease remains unclear. Since 1996, serotype 03:K6 strains have been associated with an increased incidence of gastroenteritis in India and in Southeast …

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Effects Of Acid Stress On Vibrio Parahaemolyticus Survival And Cytotoxicity, P.S. Marie Yeung, Kathryn J. Boor Jan 2004

Effects Of Acid Stress On Vibrio Parahaemolyticus Survival And Cytotoxicity, P.S. Marie Yeung, Kathryn J. Boor

Biological Sciences

For several foodbome bacterial pathogens, an acid tolerance response appears to be an important strategy for counteracting acid stress imposed either during food processing or by the human host. The acid tolerance response enhances bacterial survival of lethal acid challenge following prior exposure to sublethal acidic conditions. Previous studies have revealed relationships between a foodbome pathogen's ability to survive acid challenge and its infectious dose. Vibrio parahaemolyticus is capable of causing gastroenteritis when sufficient cells of pathogenic strains are consumed. This study was designed to characterize acid sensitivities and to compare the effect of sublethal acid exposure (adaptation) on survival …

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Recruitment Of The Puf3 Protein To Its Mrna Target For Regulation Of Mrna Decay In Yeast, Wendy Olivas, J. Jackson, S. Houshmandi, Leban Lopez Jan 2004

Recruitment Of The Puf3 Protein To Its Mrna Target For Regulation Of Mrna Decay In Yeast, Wendy Olivas, J. Jackson, S. Houshmandi, Leban Lopez

Biology Department Faculty Works

The Puf family of RNA-binding proteins regulates mRNA translation and decay via interactions with 3' untranslated regions (3' UTRs) of target mRNAs. In yeast, Puf3p binds the 3' UTR of COX17 mRNA and promotes rapid deadenylation and decay. We have investigated the sequences required for Puf3p recruitment to this 3' UTR and have identified two separate binding sites. These sites are specific for Puf3p, as they cannot bind another Puf protein, Puf5p. Both sites use a conserved UGUANAUA sequence, whereas one site contains additional sequences that enhance binding affinity. In vivo, presence of either site partially stimulates COX17 mRNA decay, …

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An Unusual Lava Cave From Ol Doinyo Lengai, Tanzania, Donald A. Mcfarlane, Joyce Lundberg, Frederick Belton Jan 2004

An Unusual Lava Cave From Ol Doinyo Lengai, Tanzania, Donald A. Mcfarlane, Joyce Lundberg, Frederick Belton

WM Keck Science Faculty Papers

A new type of lava cave is described from the summit crater of Ol Doinyo Lengai, a unique active carbonatite volcano in Tanzania. This and other similar caves on Ol Doinyo Lengai are formed by thermal erosion and aqueous dissolution of otherwise solid spatter cones. Meteoritic water and endogenous condensates act to form speleothems of complex mineralogy up to 3 m in length. We propose the new classification of “polygenetic spatter cone cave”.

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Changes In Gdnf Protein Content Of Skeletal Muscle Following Involuntary Exercise Are Long Lived, Kyle R. Kinnell, Monica J. Czarnopys, John Spitsbergen Jan 2004

Changes In Gdnf Protein Content Of Skeletal Muscle Following Involuntary Exercise Are Long Lived, Kyle R. Kinnell, Monica J. Czarnopys, John Spitsbergen

Biological Sciences Faculty and Graduate Student Research

Glial-cell line derived neurotrophic factor (GDNF) is a neurotrophic factor produced by skeletal muscle. GDNF has been shown to be potent survival factor for motor neurons. We have previously shown that GDNF content in skeletal muscle is altered following exercise and GDNF levels 24 hours after the last bout of exercise are significantly different than those measured immediately after exercise. We sought to determine how long after exercise do GDNF protein levels remain altered. We removed extensor digitorum longus (EDL) and Soleus (SOL), 24 hr, 72 hr and 1 week following the last bout of involuntary exercise. Muscles were processed …

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Chronological Patterns Of Emergence Of Dragonflies In Carver Pond, Bridgewater, Ma, Chris Haslam Jan 2004

Chronological Patterns Of Emergence Of Dragonflies In Carver Pond, Bridgewater, Ma, Chris Haslam

Undergraduate Review

In this study larval skins of dragonflies were collected counted and studied in order to find peaks and patterns of emergence and correlate with environmental factors. One of the most important stages of the life of a dragonfly is the time when it changes from a larval aquatic insect into a flying adult. This stage takes place when the dragonfly emerges out of its skin called the exuvia. Exuvia were collected from two sites at Carver Pond, Bridgewater, Massachusetts to determine differences in species emergence patterns from May 26, 2003 to July 18, 2003 and correlated with environmental conditions. Peak …

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