Concentrations of Synthetic organic chemicals in leachate from a municipal landfill.

A study on the concentrations of synthetic organic chemicals in leachate from the municipal landfill of Lake Charles, Louisiana, was conducted from June 1987 through March 1989. The primary objective of this study was to provide information on the concentrations of synthetic organics in leachate from a typical municipal landfill. Leachate analyses yielded the presence of a variety of synthetic organic compounds at wide ranges in concentration.

Interspecific mating between Louisiana strains of Aedes albopictus and Aedes aegypti in the field and laboratory.

Interspecific mating between Aedes albopictus males and Ae. aegypti females was detected in the field using mark-release-recapture techniques. By 3 days after the release of virgin Ae.

The mechanism of enzymically induced chemiluminescence reactions of lucigenin.

Lucigenin (Bis-N-methylacrylium nitrate) reacts with H2O2 to produce ground state and excited state monomer. The excited state monomer decays with the emission of light. When lucigenin is added to reaction mixtures containing vitamin-K-dependent carboxylase, light emission is produced which is inversely proportional to enzyme concentration and co-inhibited with inhibitors of vitamin-K-dependent carboxylase.

Habitat associations of mosquito and copepod species.

Copepods and mosquitoes were collected and identified over a 12-month period from three woodland ponds, discarded tires and a salt marsh. The species distribution of both mosquitoes and copepods varied among habitats and seasonally. Acanthocyclops vernalis was the predominant copepod in all of the habitats except the discarded tires, where Thermocyclops dybowskii was the predominant species.

Periphyton as monitors for heavy metal pollution in the Calcasieu River estuary.

The levels of copper, lead, chromium, zinc, cadmium, arsenic and silver were determined in periphyton specimens obtained with a diatometer collector. Stations selected were along three important bayous of the Calcasieu River system. Distributions of some metals in the organisms were similar to those found in sediment from the same locations, while other metals appeared to be similar to water concentrations.

Effects of sublethal exposure to Bacillus thuringiensis var. israelensis on larval development and adult size in Aedes aegypti.

The effects of exposure to sublethal concentrations of Bacillus thuringiensis var. israelensis (Serotype H-14) on second instar Aedes aegypti larvae were investigated. A test system was developed in which adverse effects would be detected as increased duration of larval development and decreased adult body size.

The size of emerging and host-seeking Aedes aegypti and the relation of size to blood-feeding success in the field.

The average wing length of Aedes aegypti females collected as pupae was 2.47 mm, which was significantly smaller than the 2.64 mm average wing length of the host-seeking females collected in the field.

GENOMIC COADAPTATION AND DEVELOPMENTAL STABILITY WITHIN INTROGRESSED POPULATIONS OF ENNEACANTHUS GLORIOSUS AND E. OBESUS (PISCES, CENTRARCHIDAE).

Using fluctuating bilateral asymmetry as a measure of developmental stability, we tested the hypothesis that genomic coadaptation mediates developmental stability in natural populations. Hybrid populations were more asymmetrical than populations of the parental species, and ranks of overall developmental instability were positively correlated with ranks of mean heterozygosity in these populations. The failure to find increased asymmetry in previous studies of natural hybrid populations (Jackson, 1973a, 1973b; Felley, 1980) suggests that such populations may have re-evolved coadapted genomes.