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Articles 301 - 303 of 303
Full-Text Articles in Life Sciences
Patterns Of Resource Use By A Drosophilid (Diptera) Leaf Miner On A Native Crucifer, S. K. Collinge, Svata M. Louda
Patterns Of Resource Use By A Drosophilid (Diptera) Leaf Miner On A Native Crucifer, S. K. Collinge, Svata M. Louda
School of Biological Sciences: Faculty Publications
Distribution and damage of Scaptomyza nigrita Wheeler on its host (bittercress, Cardamine cordifolia A. Gray), a native perennial crucifer, were examined over two growing seasons in relation to leaf position. Concentrations of defensive compounds (glucosinolates) and of nutritive compounds (total nitrogen, free amino acids, soluble carbohydrates) were also examined. The fly-host plant relationship was studied in sun and shade habitats at two sites. Oviposition and leaf-mining damage were concentrated on the lower central leaves of a stem in both habitats. These mature leaves have lower glucosinolate concentrations than new leaves. Adult densities and larval feeding damage were consistently and significantly …
Can We Guarantee The Safety Of Genetically Engineered Organisms In The Environment?, Kathleen H. Keeler, Frances E. Sharples
Can We Guarantee The Safety Of Genetically Engineered Organisms In The Environment?, Kathleen H. Keeler, Frances E. Sharples
School of Biological Sciences: Faculty Publications
Can we guarantee the safety of genetically engineered organisms in the environment? To anticipate my remarks, the answer to the title question is “No, we cannot guarantee the safety of genetically engineered organisms released into the environment.” Indeed, it is a tenet of the scientific method that nothing can be proved, only disproved. Thus, we can never show that a release will be safe. We could only show that it would be unsafe, if that were the case. However, if the question is posed differently, for example, can we safely release genetically engineered organisms into the environment?, the answer is …
Key To Acanthocephala Reported In Waterfowl, Malcolm Edwin Mcdonald,
Key To Acanthocephala Reported In Waterfowl, Malcolm Edwin Mcdonald,
United States Fish and Wildlife: Staff Publications
This is the third part of a continuing series on helminths reported in waterfowl (McDonald 1974, 1981). Coots and moorhens (in Family Rallidae, Order Gruiformes) are included with the Anatidae of Anseriformes. The goal of these studies is complete coverage of waterfowl helminths of the world, although the original incentive-inadequate knowledge of the parasites of North American waterfowl- is less true now. World coverage is desirable because the world distribution of the family, tribes, and even many species of waterfowl often results in world distribution of parasites. The format of this key follows that of the others in the series: …