A5012499183- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Fish Ecology and Management Studies
- Aquatic Invertebrate Ecology and Behavior
- Soil and Water Nutrient Dynamics
- Aquatic Ecosystems and Biodiversity
- Microbial Community Ecology and Physiology
- Freshwater macroinvertebrate diversity and ecology
- Water Quality and Pollution Assessment
- Protist diversity and phylogeny
- DNA Repair Mechanisms
- Prion Diseases and Protein Misfolding
- Diatoms and Algae Research
- Isotope Analysis in Ecology
- Environmental Toxicology and Ecotoxicology
- Stellar, planetary, and galactic studies
- Mine drainage and remediation techniques
- Bacterial Genetics and Biotechnology
- DNA and Nucleic Acid Chemistry
- Herpesvirus Infections and Treatments
- Transboundary Water Resource Management
- Heavy metals in environment
- Astrophysics and Star Formation Studies
- Virus-based gene therapy research
- Fish Biology and Ecology Studies
Royal Observatory
2012-2023
University of Waterloo
2014-2023
UK Astronomy Technology Centre
2012-2023
The Ohio State University
1981-2022
York Hospital
2014
Concord University
2012
Scottish Universities Physics Alliance
2012
University of Edinburgh
2012
Animal and Plant Health Inspection Service
1992-2002
National Animal Disease Center
1999-2001
Dreissenid mussels have been exceptionally successful invaders in North American lakes and rivers, especially the lower Laurentian Great Lakes. As benthic filter feeders capable of attaching to hard substrates, magnitudes their biomass filtering activity nearshore waters are without precedent. The dreissenid colonization has implications for removal fate materials filtered from water by longer-term development community lake ecosystem. A conceptual model, shunt, seeks describe a fundamental...
Abstract Atmospheric photodissociation rate coefficients and lifetimes for nitromethane, methyl nitrite, nitrate were calculated as a function of altitude from their measured visible near ultraviolet photoabsorption cross sections at 298 K. The lifetime nitrite is nearly independent approximately 2 min. From 0 to 50 km the nitromethane varies 10 0.5 hr, while that changes 5.3 0.09 days, respectively.
The relationships between riparian land use and environmental parameters that define the suitability of southern Ontario streams for trout were examined 40 sites on 38 streams. Weekly observations maximum minimum temperature, coarse line suspended matter, discharge made during June, July, August 1980. Land was determined from aerial photographs each stream. Fish surveyed at site by electrolishing seining. only variable which clearly distinguished nontrout weekly water temperature: with...
Electron spin resonance was used to measure the diffusion of a small (Mr 170) label in aqueous cytoplasm mammalian cells. Translational and rotational motion were determined from same spectra. Based on measurements made model systems, it hypothesized that calculations apparent viscosity either or translational would distinguish between effects cytoplasmic structure diffusion. The coefficient calculated collision frequency, averaged 3.3 X 10(-6) cm2/sec several cell lines. It greater growing...
A comparative study of small temperate lakes (<20 square kilometers) indicates that the mixing depth or epilimnion is directly related to light penetration measured as Secchi depth. Clearer have deeper depths. This relation result greater incident solar radiation in and enclosures with high water clarity. Data show largely a function size distribution biomass algae indicated by between index plankton (slope) Larger steeper slopes (indicative communities dominated plankton) are associated...
The epilimnion depth of lakes is related both to lake size, which affects wind‐induced mixing, and water clarity, the over solar radiation heats water. Here we attempt isolate relative importance these two variables by examining that have changed in clarity with time (between years), nearby comparable partitioning a large number into subsets restricted range size or Secchi depth. Overall, results indicate are important determinants depth, but absolute effect (indicated slope) approximately...
Hydrophobic organochlorine contaminants were surveyed in net plankton from 33 lakes southern Ontario. Organochlorines detected all lakes. The relative concentrations of 12 common organochlorines generally similar, suggesting that they derive a source, probably atmospheric transport. Variability abundances these increased with contaminant concentration, while concentration was related to biomass, total phosphorus, and conductivity. Lakes low biomass had high indicating large portion the...
Published data on cell size, maximum division rate, and genomic DNA content were compiled for over 70 species of unicellular prokaryotes eukaryotes. Analysis these revealed statistically significant, positive correlations between volume both eukaryotes, minimum doubling time The relations exhibited by eukaryotes are different from each other. time-DNA relation is indistinguishable a similar plant root cells. Ciliates, which exhibit nuclear dualism, display total rate micronuclear those uninucleate,
Nutrients, planktivorous fish (1 + yellow perch), or both were added to eight large enclosures in a 2 × factorial design. The size distributions of particulate phosphorus (PP) and assimilated 3 PO 4 3− turnover times determined from June through August by filter fractionation. amount PP >200 µ m (mesoplankton) increased with fertilization decreased addition fish, but the nanoplankton (3–20 m) picoplankton (1–3 showed opposite results. Fertilization had interacting effects on microplankton...
SummaryDamage caused by accelerated atomic nuclei was measured in ΦX-174 Replicative Form I (RF I) DNA as a function of linear-energy transfer (LET). Irradiations were performed at room temperature highly radioprotective broth to minimise the effects free radicals. Most ion beams terminated continuously-mixed samples. By using neutral sucrose gradient sedimentation 3H-TdR-labelled RF DNA, irradiated samples assayed for relative proportions (supercoil), II (open coil), and III (linear)...
Eutrophication of freshwaters is already a problem in many regions globally and will probably worsen as human populations grow consume more resources. The ability researchers governments to anticipate, mitigate, restore eutrophic cohesive, integrated manner suffers from key uncertainties our understanding the watershed-to-lake continuum. Here, we use Lake Erie its watershed an example system which there pressing need resolve these uncertainties. In recent history, both suffered recovered...
A guide to confirmed geosmin- and MIB-producing cyanobacteria isolated in the United States is being prepared. This document will include 41 different species or morphologically distinct types from eight states diverse aquatic sources over a 22-year period. The organisms comprised by this demonstrate importance of attached as off-flavor agents, strain specificity MIB production, existence unicellular producers, occurrence multiple geosmin producers reservoirs, relationship certain planktonic...
Prion protein (PrP), which is involved in the pathogenesis of scrapie, occurs 2 forms. The form extracted from scrapie brain protease resistant (PrP-res), whereas PrP normal sensitive (PrP-sen). This study examined whether PrP-res could be detected brains sheep with by immunohistochemistry (IHC). A suitable IHC procedure was developed using tissue hamsters that had been inoculated transmissible mink encephalopathy agent. Tissue samples were fixed PLP (periodate, lysine, paraformaldehyde)...
Data from experiments on feeding, assimilation, and reproduction of Daphnia pulex grown in different cell concentrations Chlamydomonas reinhardtii formed the basis for an individual growth model D. pulex. The predictions both somatic agree with subsequent experimental results. Contrary to many higher organisms, assimilation efficiency increases increasing body size. This may be, at least part, reason why larger body-sized zooplankton tend dominate aquatic ecosystems when not controlled by...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of the enzyme complex involving folate-requiring enzymes de novo purine biosynthesisGary K. Smith, W. Thomas Mueller, Gail Folena Wasserman, William D. Taylor, and Stephen J. BenkovicCite this: Biochemistry 1980, 19, 18, 4313–4321Publication Date (Print):September 1, 1980Publication History Published online1 May 2002Published inissue 1 September...
The Tarantula Nebula (30 Dor) is a spectacular star-forming region in the Large Magellanic Cloud, seen through gas Galactic Disc and Halo. Diffuse Interstellar Bands offer unique probe of diffuse, cool-warm these regions. aim to use DIBs as diagnostics local interstellar conditions, whilst at same time deriving properties yet-unknown carriers. Spectra over 800 early-type stars from VLT Flames Survey (VFTS) were analysed. Maps created, separately, for LMC absorption 4428 6614 Ang - smaller...
Detailed studies of resolved young massive star clusters are necessary to determine their dynamical state and evaluate the importance gas expulsion early cluster evolution. In an effort gain insight into R136 obtain first measurement its velocity dispersion, we analyse multi-epoch spectroscopic data inner regions 30 Doradus in Large Magellanic Cloud (LMC) obtained as part VLT-FLAMES Tarantula Survey. Following a quantitative assessment variability, use radial velocities non-variable sources...