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Articles 1 - 14 of 14
Full-Text Articles in Life Sciences
Nitric Oxide Mediates Seasonal Muscle Potentiation In Clam Gills, Louis F. Gainey Jr., Michael J. Greenberg
Nitric Oxide Mediates Seasonal Muscle Potentiation In Clam Gills, Louis F. Gainey Jr., Michael J. Greenberg
Faculty Publications
The physiology and timing of gill muscle potentiation were explored in the clam Mercenaria mercenaria. When isolated demibranchs were exposed twice (with an intervening wash) to the same concentration of 5-hydroxytryptamine, the second contraction was larger than the first. This potentiation was seasonal: it was present from November through June, and absent from July through October. Potentiation was not affected by the geographic origin of the clams, nor by their acclimation temperature. Potentiation was inhibited by the nitric oxide synthase (NOS) inhibitor L-NAME and mimicked by the nitric oxide (NO) donor DEANO. During the season of potentiation, immunoreactive NOS appeared …
P-Limitation Of Respiration In The Sargasso Sea And Uncoupling Of Bacteria From P-Regeneration In Size-Fractionation Experiments, Ingrid Obernosterer, Nobu Kawasaki, Ronald Benner
P-Limitation Of Respiration In The Sargasso Sea And Uncoupling Of Bacteria From P-Regeneration In Size-Fractionation Experiments, Ingrid Obernosterer, Nobu Kawasaki, Ronald Benner
Faculty Publications
Community respiration rates were measured in unfiltered seawater collected in the upper 75 m of the water column along a transect in the Sargasso Sea and at the Bermuda Atlantic Time-series Study (BATS) station (31° 50’ 00 N; 64° 10’ 00 W) during a cruise in June and July 2001. Community respiration rates in the upper 75 m of the water column averaged 1.1 ± 0.4 μM O2 d-1 and exhibited significant spatial and temporal variability. Concurrent determination of the heterotrophic and autotrophic community revealed no relationship between community respiration and the abundance of any of the major …
Evidence For Survival Of Pleistocene Climatic Changes In Northern Refugia By The Land Snail Trochoidea Geyeri, David Posada, Markus Pfenninger, Frederic Magnin
Evidence For Survival Of Pleistocene Climatic Changes In Northern Refugia By The Land Snail Trochoidea Geyeri, David Posada, Markus Pfenninger, Frederic Magnin
Faculty Publications
The study of organisms with restricted dispersal abilities and presence in the fossil record is particularly adequate to understand the impact of climate changes on the distribution and genetic structure of species. Trochoidea geyeri (Soos 1926) is a land snail restricted to a patchy, insular distribution in Germany and France. Fossil evidence suggests that current populations of T. geyeri are relicts of a much more widespread distribution during more favourable climatic periods in the Pleistocene. Results: Phylogeographic analysis of the mitochondrial 16S rDNA and nuclear ITS-1 sequence variation was used to infer the history of the remnant populations of T. …
Aintegumenta Utilizes A Mode Of Dna Recognition Distinct From That Used By Proteins Containing A Single Ap2 Domain, Beth A. Krizek
Aintegumenta Utilizes A Mode Of Dna Recognition Distinct From That Used By Proteins Containing A Single Ap2 Domain, Beth A. Krizek
Faculty Publications
The Arabidopsis protein AINTEGUMENTA (ANT) is an important regulator of organ growth during flower development. ANT is a member of the AP2 subclass of the AP2/ERF family of plant-specific transcription factors. These proteins contain either one or two copies of a DNA-binding domain called the AP2 domain. Here, it is shown that ANT can act as a transcriptional activator in yeast through binding to a consensus ANT-binding site. This activity was used as the basis for a genetic screen to identify amino acids that are critical for the DNA binding ability of ANT. Mutants that showed reduced or no activation …
Biochemical Composition Of Embryonic Blue Crabs Callinectes Sapidus Rathbun 1896 (Crustacea : Decapoda) From The Gulf Of Mexico, Janet R. Jacobs, Patricia M. Biesiot, Harriet M. Perry, Christine Trigg
Biochemical Composition Of Embryonic Blue Crabs Callinectes Sapidus Rathbun 1896 (Crustacea : Decapoda) From The Gulf Of Mexico, Janet R. Jacobs, Patricia M. Biesiot, Harriet M. Perry, Christine Trigg
Faculty Publications
Blue crab Callinectes sapidus embryos from the Mississippi Sound were sampled in spring and in late summer to determine patterns of biochemical composition and of yolk utilization during embryogenesis and to ascertain potential seasonal differences in biochemical composition. The diameter of spring embryos was similar to 6% greater than summer embryos but this significant size difference was due to increased water content, not to increased organic content. The general trend in initial biochemical composition was similar in both seasons; protein was the primary component at similar to 50% of initial dry weight followed by lipid (similar to 30%), ash (similar …
Microalgal-Meiofaunal Trophic Relationships In Muddy Intertidal Estuarine Sediments, James L. Pinckney, Kevin R. Carman, S. Elizabeth Lumsden, Sabrina N. Hymel
Microalgal-Meiofaunal Trophic Relationships In Muddy Intertidal Estuarine Sediments, James L. Pinckney, Kevin R. Carman, S. Elizabeth Lumsden, Sabrina N. Hymel
Faculty Publications
The determination of the primary factors controlling carbon (C) transfer rates in situ are a basic requirement for developing a mechanistic view of the processes that regulate benthic microbial community structure and function. In many estuarine ecosystems, the base of the food web is dominated by microalgal production; however, information on the quantitative relationships and process rates of meiofaunal grazers and benthic microalgal (BMA) producers is limited to a few habitats and short temporal scales. The primary objective of this study was to examine the trophic interactions between meiofaunal grazers and BMA producers to determine if grazing is a primary …
Site‐Selective In Vivo Targeting Of Cytosine‐5 Dna Methylation By Zinc‐Finger Proteins, Christopher D. Carvin, Rebecca D. Parr, Michael P. Kladde
Site‐Selective In Vivo Targeting Of Cytosine‐5 Dna Methylation By Zinc‐Finger Proteins, Christopher D. Carvin, Rebecca D. Parr, Michael P. Kladde
Faculty Publications
Cytosine‐5 DNA methylation is a critical signal defining heritable epigenetic states of transcription. As aberrant methylation patterns often accompany disease states, the ability to target cytosine methylation to preselected regions could prove valuable in re‐establishing proper gene regulation. We employ the strategy of targeted gene methylation in yeast, which has a naturally unmethylated genome, selectively directing de novo DNA methylation via the fusion of C5 DNA methyltransferases to heterologous DNA‐binding proteins. The zinc‐finger proteins Zif268 and Zip53 can target DNA methylation by M.CviPI or M.SssI 5–52 nt from single zinc‐factor binding sites. Modification at specific GC (M.CviPI) or CG (M.SssI) …
To The Knowledge Of Trigonalyid Wasps (Hymenoptera: Trigonalyidae) Of Sakhalin, Daniel J. Bennett, Arkady S. Lelej
To The Knowledge Of Trigonalyid Wasps (Hymenoptera: Trigonalyidae) Of Sakhalin, Daniel J. Bennett, Arkady S. Lelej
Faculty Publications
The northern border for the distribution of the Trigonalyidae on Sakhalin is moved northwards to 49° N. The genus Orthogonalys Schulz, 1905 and O. elongata (Teranishi, 1929) are new for Sakhalin fauna.
Biodiversity And Biogeography Of The Islands Of The Kuril Archipelago [Abstract], Theodore W. Pietsch, Victor V. Bogatov, Kunio Amaoka, Yuri N. Zhuravlev, Vyacheslav Y. Barkalov, Sarah Gage, Hideki Takahashi, Arkady S. Lelej, Sergey Y. Storozhenko, Noboru Minakawa, Daniel J. Bennett, Trevor R. Anderson, Masahiro Ôhara, Larisa A. Prozorova, Yasuhiro Kuwahara, Sergey K. Kholin, Mamoru Yabe, Duane E. Stevenson, Erin L. Macdonald
Biodiversity And Biogeography Of The Islands Of The Kuril Archipelago [Abstract], Theodore W. Pietsch, Victor V. Bogatov, Kunio Amaoka, Yuri N. Zhuravlev, Vyacheslav Y. Barkalov, Sarah Gage, Hideki Takahashi, Arkady S. Lelej, Sergey Y. Storozhenko, Noboru Minakawa, Daniel J. Bennett, Trevor R. Anderson, Masahiro Ôhara, Larisa A. Prozorova, Yasuhiro Kuwahara, Sergey K. Kholin, Mamoru Yabe, Duane E. Stevenson, Erin L. Macdonald
Faculty Publications
No abstract provided.
Blackspot Disease Of Roses [Abstract], Robert J. Wiggers, Josephine Taylor, J. A. Margoitta, S. G. Pandalai
Blackspot Disease Of Roses [Abstract], Robert J. Wiggers, Josephine Taylor, J. A. Margoitta, S. G. Pandalai
Faculty Publications
No abstract provided.
Accelerated Hatching Of Southern Leopard Frog (Rana Sphenocephala) Eggs In Response To The Presence Of A Crayfish (Procambarus Nigrocinctus) Predator, Daniel Saenz, James B. Johnson, Cory K. Adams, Gage H. Dayton
Accelerated Hatching Of Southern Leopard Frog (Rana Sphenocephala) Eggs In Response To The Presence Of A Crayfish (Procambarus Nigrocinctus) Predator, Daniel Saenz, James B. Johnson, Cory K. Adams, Gage H. Dayton
Faculty Publications
Phenotypic plasticity, such as morphological and behavioral changes in response to predators, is common in larval anurans. Less is known about inducible defenses in the embryonic stages of development. We investigated the predation risk imposed by crayfish (Procambarus nigrocinctus) on southern leopard frog (Rana sphenocephala) eggs aud whether crayfish presence induces a change in the timing of hatching of R. sphenocephala eggs. We found that crayfish significantly reduce the hatching success of R. sphenocephala eggs by eating them and that eggs hatch significantly faster in the presence of crayfish than when crayfish are not present. We …
The Influence Of Predator Threat On The Timing Of A Life-History Switch Point: Predator-Induced Hatching In The Southern Leopard Frog (Rana Sphenocephala), James B. Johnson, Daniel Saenz, Cory K. Adams, Richard N. Conner
The Influence Of Predator Threat On The Timing Of A Life-History Switch Point: Predator-Induced Hatching In The Southern Leopard Frog (Rana Sphenocephala), James B. Johnson, Daniel Saenz, Cory K. Adams, Richard N. Conner
Faculty Publications
We tested the hypotheses that potential egg predators, crayfish Procambarus nigrocinctus and dytiscid Cybister sp. larvae, would accelerate the timing of hatching and that a larval predator, dragonfly naiad Anax junius, would delay hatching in the southern leopard frog (Rana sphenocephala). We also tested the hypothesis that differences in response would be proportional to predator lethality. Our results indicate that our hypotheses were partially supported. The presence of an efficient egg predator (crayfish) induces hatching faster than a less efficient predator (dytiscid larvae). However, the presence of a larval predator (naiads) did not delay hatching. Eggs that …
Effects Of Weather On Autumn Hawk Movements At Fort Morgan, Alabama, Stefan Woltmann, David Cimprich
Effects Of Weather On Autumn Hawk Movements At Fort Morgan, Alabama, Stefan Woltmann, David Cimprich
Faculty Publications
Migrating hawks were observed at Fort Morgan, Alabama during autumn 1995-1998. The three most abundant migrants were Sharp-shinned Hawk (Accipiter striatus), Broad-winged Hawk (Buteo platypterus) and American Kestrel (Falco sparverius). The three species accounted for 84% of all observations. Most individuals (> 80%) were seen heading west. Compared with days with east and south winds, days with north winds were associated with significantly higher passage rates for all species, and passage rates of Broadwinged Hawks were significantly higher on days when both a cold front and north winds occurred than on days with north winds only. …
Long-Term Observations Of A Harbor Seal Haul-Out Site In A Protected Cove In Casco Bay, Gulf Of Maine, David Harris Phd, Barbarai Lelli, Sat Gupta
Long-Term Observations Of A Harbor Seal Haul-Out Site In A Protected Cove In Casco Bay, Gulf Of Maine, David Harris Phd, Barbarai Lelli, Sat Gupta
Faculty Publications
We counted the numbers of seals hauled out at low tide on two near-shore ledges in a protected cove in Casco Bay, Gulf of Maine a minimum of 12 times per month, for four years starting in August 1997. The highest mean monthly counts were in August (molting season) and the lowest in either January or February. Counts during pupping season (May and June) were lower than during April or July. As no mother-pup pairs were observed, these ledges are molting but not pupping ledges. Time-series analysis revealed no overall trend in the number of seals present. but did show …