Fipronil is widely used against insects in agriculture and ectoparasites domestic areas veterinary medicine. However, fipronil may influence non-target species as a result of the contamination aquatic ecosystems. The present study aimed to investigate acute sublethal effects freshwater mussels (Unio delicatus), species, with physiological, antioxidant action mechanisms histopathological observa...

Long-chain proline-rich antimicrobial peptides such as bumblebee abaecin show minimal activity against Gram-negative bacteria despite binding efficiently to specific intracellular targets. We recently reported that bumblebee abaecin interacts with Escherichia coli DnaK but shows negligible antibacterial activity unless it is combined with sublethal doses of the pore-forming peptide hymenoptaeci...

Pairs of Helicoverpa zea (Boddie) larvae reared on diet-incorporated MON810 transgenic leaf tissue of field corn (Zea mays L.) were observed in the laboratory to characterize effects of sublethal levels of Bacillus thuringiensis variety kurstaki (Bt) Cry1Ab endotoxins on cannibalistic behavior and mortality. Feeding on sublethal levels of Bt corn reduced the frequency of cannibalistic behaviors...

A NUMBER OF OBSERVATIONS have suggested that megakaryocytopoiesis is subject to homeostatic control. The mechanism by which feedback regulation of platelet production may be mediated, however, has not been defined. One reason for this is that a reproducible, sensitive, and specific system by which humoral thrombopoietic substances could be assayed has not been described. In the past, a comparab...

Systems have been developed to monitor the direct effects of insect growth regulator (IGR) pesticide exposure on honey bee development, but there has been little work on the longer-term impact of exposure on the colony. A honey bee population model provided the opportunity to investigate the effects of short-term mortality of brood and of sublethal changes in behaviour of the surviving adults o...

Heat treatment is a popular alternative to synthetic pesticides in disinfesting food-processing facilities and empty grain storages. Sitophilus zeamais Mostchulsky is one of the most cosmopolitan and destructive insects found in empty grain storage facilities and processing facilities. The effect of acclimation in S. zeamais adults to sublethal high temperature on their subsequent susceptibilit...

Alpha-cypermethrin, a synthetic pyrethroid, is used as an insecticide in agricultural settings and is increasingly replacing organophosphates and carbamates because of lower application rates and lower toxicity to mammals. Because very little is known about the acute and chronic toxicity of this compound for soil-living organisms, the present study investigated acute and sublethal toxicity of a...

Exponentially growing cells and cells that were allowed to enter a plateau or nondividing state of growth by depleting the medium of growth-essential nutrients were used in these studies. Nondividing Chinese hamster ovary cells in vitro are less sensitive to actinomycin D (AMD) than are exponentially growing cells. The cells were tested for their ability to recover from AMD-induced potentially ...

Two experiments were conducted testing for lethal and sublethal effects of the transgenicproteinsCry1Acandchitinase, and thechemical seedand soil treatment imidaclopridonbumble bees (Bombus occidentalis Greene and B. impatiens Cresson, Hymenoptera: Apidae). In the Þrst experiment, B. occidentalis colonies were exposed to realistic residue levels of Cry1Ac, chitinase, and imidacloprid found in p...

An analysis of mammalian cell radiation ± dose surIn studies concerning mechanisms that determine vival curves, based on the linear ± quadratic formalism, is shown radiosensitivities of mammalian cells, three di å erent to yield insights in the various components of damage that approaches can be distinguished which complement contribute to cell reproductive death . R B E ± LET relationships of ...