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The hexagon model of color vision predicts that white flowers which reflect ultraviolet light resemble green foliage to a
bee's eye, whereas, according to other models of the bee color vision, UV-reflecting white is discriminable from foliage green.
The hexagon model is widely used in ecologically and evolutionary oriented literature, and the predicted similarity between
white and green has been recently presented as a well established fact (Waser and Chittka 1998). We show that bees detect
UV-reflecting white objects presented on a green background, a finding that is in disagreement with the predictions of the
hexagon model.
Received: 22 March 1999 / Accepted in revised form: 2 July 1999 相似文献
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Ralf Dillert Matthias Brandt Iris Fornefett Ulrike Siebers Detlef Bahnemann 《Chemosphere》1995,30(12):2333-2341
The photocatalytic degradation of 2,4,6-trinitrotoluene and ten other nitroaromatic compounds in aerated TiO2 suspensions has been studied. The following order of reactivity was observed: nitrotoluenes > nitrobenzene > dinitrotoluenes . dinitrobenzenes > 2,4,6-trinitrotoluene > 1,3,5-trinitrobenzene, which reflects the known influence of nitro groups towards the attack of electrophilic reagents on the aromatic molecule. 相似文献
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Three 14C-labelled polychloroalkanes (C12 and C16), representing low (23% Cl by weight), medium (51%), and highly (68%) chlorinated paraffin (CP) mixtures, were presented to rainbow trout via the water. The uptake in fat-rich tissues was positively correlated to the degree of chlorination of the preparations. Notably, all preparations gave rise to a high and selective uptake of radioactivity in the olfactory organ and gills. This selective radiolabelling may reflect a general ability of these organs to enrich xenobiotics from the surrounding water. The olfactory organ may be a hitherto unforseen target for toxic environmental pollutants in fish. 相似文献
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The Science of Nature - 相似文献
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Soil contaminations with the explosive 2,4,6-TNT are a major problem at many sites of former ammuniton plants in Germany. But only little is known about its environmental or metabolic fate in soil or plants. A field study was conducted on a former ammunition plant in Stadtallendorf/Hessen. Three areas with different TNT concentrations were planted with 8 different crops. After harvest plants were analyzed for TNT, ADNTs and DNTs. Soil contamination decreased in the rhizosphere compared to unplanted areas and there was a transfer of TNT from soil to the plants. Accumulation in plants was dependent on soil contamination and also specific for different plant parts or plant species. The contamination spectrum of TNT and derivatives was different in soil or plant tissue, respectively. After acid hydrolysis of bean roots, 2,6-DNT and 2,4-DNT could be identified in the extract. 相似文献