نتایج جستجو برای: confused flour beetle
تعداد نتایج: 29106 فیلتر نتایج به سال:
A previously unknown class of dominant, maternal-effect lethal M factors was found to be widespread in natural populations of the flour beetle, Tribolium castaneum, collected on several continents. Such factors are integrated into the host chromosomes at variable locations and show the remarkable property of self-selection by maternal-effect lethality to all hatchlings that do not inherit a cop...
Oscillating discrete autonomous dynamical systems admit multiple oscillatory solutions in the advent of periodic forcing. The multiple cycles are out of phase, and some of their averages may resonate with the forcing amplitude while others attenuate. In application to population biology, populations with stable inherent oscillations in constant habitats are predicted to develop multiple attract...
A scaling rule of ecological theory, accepted but lacking experimental confirmation, is that the magnitude of fluctuations in population densities due to demographic stochasticity scales inversely with the square root of population numbers. This supposition is based on analyses of models exhibiting exponential growth or stable equilibria. Using two quantitative measures, we extend the scaling r...
Genetic screens are powerful tools to identify the genes required for a given biological process. However, for technical reasons, comprehensive screens have been restricted to very few model organisms. Therefore, although deep sequencing is revealing the genes of ever more insect species, the functional studies predominantly focus on candidate genes previously identified in Drosophila, which is...
In many stage-structured species, different life stages often occupy separate spatial niches in a heterogeneous environment. Life stages of the giant flour beetle Tribolium brevicornis (Leconte), in particular adults and pupae, occupy different locations in a homogeneous habitat. This unique spatial pattern does not occur in the well-studied stored grain pests T. castaneum (Herbst) and T. confu...
Adaptation of polyphenol oxidase measuring methods (AACCI Method 22-85) for wheat meal and flour and their relationship to alkaline noodle color Noodle color is a critical sensory attribute in raw noodles. Darkening of noodles is due to the polyphenol oxidase (PPO) activity, which is a concern for the noodle industry and breeders. A method for measuring PPO activity of wheat kernels has been ap...
Approximately 50% of total harvested cereal grains are lost during the post-harvest handling and storage, insects main cause for both quantity (reductions in weight) quality. In present study effect microwave radiation was studied on one stored product pest, flour beetle Tribolium castaneum (Hersbt). Adult were obtained from infested products at stores specialized selling Sakaka. Insects with i...
Cryptochrome (CRY) proteins are components of the central circadian clockwork of metazoans. Phylogenetic analyses show at least 2 rounds of gene duplication at the base of the metazoan radiation, as well as several losses, gave rise to 2 cryptochrome (cry) gene families in insects, a Drosophila-like cry1 gene family and a vertebrate-like cry2 family. Previous studies have shown that insect CRY1...
Twenty naturally occurring monoterpenoids were evaluated in a preliminary fumigation screening test on some important stored-product pest insects, including the rice weevil, Sitoplzilus oryzae, the red flour beetle, Tribolium castaneum, the sawtoothed grain beetle, 0rj)zaephilus surinamensis, the house fly, Musca dornestica, and the German cockroach, Blattella germanica. Cineole, 1-fenchone, an...
IN the fall of 1986 my colleague, Dick Beeman, sat in my office at Kansas State University and told me a fascinating story. He worked at what was then called the U. S. Grain Marketing Research Laboratory, a U. S. Department of Agriculture facility about a mile from campus. He was trained as an insect toxicologist, but to aid in his research he had become a self-taught geneticist using the red f...
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