| comparative studies of herpetomonads and leishmanias : i. cultivation of herpetomonads from insects and plants. | nine strains of herpetomonads have been isolated in pure culture from eight varieties of insects, and three strains from two species of plants. four of the cultures were derived from latex-feeding insects (oncopeltus fasciatus, oncopeltus sp. ?, lygaeus kalmii) and three from latex plants (asclepias syriaca, asclepias nivea), two from mosquitoes (culex pipiens and anopheles quadrimaculatus), one from the house fly (musca domestica), and two from bluebottle flies. in addition impure cultures have ... | 1926 | 19869186 |
| comparative studies of herpetomonads and leishmanias : ii. differentiation of the organisms by serological reactions and fermentation tests. | serological reactions and fermentation tests have been employed in the present investigation as a means of differentiating various strains of herpetomonads from one another as well as from leishmanias. the twelve strains of herpetomonads isolated from insects and plants all proved to be serologically unrelated to any of the leishmanias, and were distinguishable from them by the manner in which they affected various carbohydrates. three of the strains of herpetomonads tested had been isolated fro ... | 1926 | 19869187 |
| community-wide convergent evolution in insect adaptation to toxic cardenolides by substitutions in the na,k-atpase. | the extent of convergent molecular evolution is largely unknown, yet is critical to understanding the genetics of adaptation. target site insensitivity to cardenolides is a prime candidate for studying molecular convergence because herbivores in six orders of insects have specialized on these plant poisons, which gain their toxicity by blocking an essential transmembrane carrier, the sodium pump (na,k-atpase). we investigated gene sequences of the na,k-atpase α-subunit in 18 insects feeding on c ... | 2012 | 22826239 |
| migration strategies of insects. | physiological and ecological results from a variety of species are consistent with what seem to be valid general statements concerning insect migration. these are as follows: (i)during migration locomotory functions are enhanced and vegetative functions such as feeding and reproduction are suppressed. (ii) migration usually occurs prereproductively in the life of the adult insect (the oogenesis-flight syndrome). (iii)since migrant individuals are usually prereproductive, their reproductive value ... | 1972 | 17813822 |
| host-associated fitness trade-offs do not limit the evolution of diet breadth in the small milkweed bug lygaeus kalmii (hemiptera: lygaeidae). | theoretical models of evolution in a temporally variable environment predict that genotypes with low variance in fitness across generations will be favored. when host use varies temporally and fitness trade-offs exist among hosts, such that an increase in performance on one host results in a correlated decrease on the other, selection for low variance in fitness across generations will favor genotypes which are generalists. before predictions such as this can be extended to natural herbivore pop ... | 1994 | 28313634 |
| olfactory basis of cannibalism in grasshoppers (orthoptera: acrididae): ii. field assessment of attractants. | the responses of rangeland grasshoppers to biologically and historically derived attractants were studied in a shortgrass prairie in southeastern wyoming in july 1990. seven long-chain fatty acids (c14-c20: singly and in combination), grasshopper cadavers, molasses, fruit extracts, and chloroform (solvent control) were tested. each attractant was applied to filter paper and placed in an arena delimited by a 0.10-m(2) aluminum ring. grasshoppers were most attracted to linoleic and linolenic acids ... | 1994 | 24242805 |