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O. Baschin B. Brandt Fritz Braun Bruno Schulz M. v. Laue 《Die Naturwissenschaften》1923,11(25):497-500
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Franz D. Oeste Rainer Haas Lothar Kaminski 《Environmental science and pollution research international》2000,7(1):5-6
We investigated a new kind of activated carbon named gaiasafe-Formstoff [1] as an agent for powerful heavy metal reduction. This activated carbon contains highly dispersed sulfide compounds. Our investigations with lead containing wastewaters showed an outstanding metal sulfide precipitation power of the new agent. The lead reduction rates are independent of wastewater parameters like lead concentration and complexing agent concentration. Contacted as powder or as a fixed bed with wastewater gaiasafe-Formstoff showed the best cleaning capacity in comparison to all other agents tested. Investigations with gaiasafe-Formstoff about its ability to reduce the contents of further heavy metals in wastewater are under way. The gaiasafe-Formstoff reaction products with wastewater represent an energy-rich and raw material-rich resource when fed to metallurgical processes. 相似文献
179.
Toxicity, dioxin-like activities, and endocrine effects of DDT metabolites—DDA, DDMU, DDMS, and DDCN
Wetterauer B Ricking M Otte JC Hallare AV Rastall A Erdinger L Schwarzbauer J Braunbeck T Hollert H 《Environmental science and pollution research international》2012,19(2):403-415
Background, aim, and scope
2,2-bis(chlorophenyl)-1,1,1-trichloroethane (DDT) metabolites, other than those routinely measured [i.e., 2,2-bis(chlorophenyl)-1,1-dichloroethylene (DDE) and 2,2-bis(chlorophenyl)-1,1-dichloroethane (DDD)], have recently been detected in elevated concentrations not only in the surface water of Teltow Canal, Berlin, but also in sediment samples from Elbe tributaries (e.g., Mulde and Havel/Spree). This was paralleled by recent reports that multiple other metabolites could emerge from the degradation of parent DDT by naturally occurring organisms or by interaction with some heavy metals. Nevertheless, only very few data on the biological activities of these metabolites are available to date. The objective of this communication is to evaluate, for the first time, the cytotoxicity, dioxin-like activity, and estrogenicity of the least-studied DDT metabolites. 相似文献180.
David J. Schulz Zhi-Yong Huang Gene E. Robinson 《Behavioral ecology and sociobiology》1998,42(5):295-303
Three experiments were conducted to explore the effects of severe food shortage on the control of two important and interrelated
aspects of temporal division of labor in colonies of the honey bee (Apis mellifera): the size and age distribution of a colony's foraging force. The experiments were conducted with single-cohort colonies,
composed entirely of young bees, allowing us to quickly distinguish the development of new (precocious) foragers from increases
in activity of bees already competent to forage. In experiment 1, colony food shortage caused an acceleration of behavioral
development; a significantly greater proportion of bees from starved colonies than from fed colonies became precocious foragers,
and at significantly younger ages. Temporal aspects of this starvation effect were further explored in experiment 2 by feeding
colonies that we initially starved, and starving colonies that we initially fed. There was a significant decrease in the number
of new foragers in starved colonies that were fed, detected 1 day after feeding. There also was a significant increase in
the number of new foragers in fed colonies that were starved, but only after a 2-day lag. These results suggest that colony
nutritional status does affect long-term behavioral development, rather than only modulate the activity of bees already competent
to forage. In experiment 3, we uncoupled the nutritional status of a colony from that of the individual colony members. The
behavior of fed individuals in starved colonies was indistinguishable from that of bees in fed colonies, but significantly
different from that of bees in starved colonies, in terms of both the number and age distribution of foragers. These results
demonstrate that effects of starvation on temporal polyethism are not mediated by the most obvious possible worker-nest interaction:
a direct interaction with colony food stores. This is consistent with previous findings suggesting the importance of worker-worker
interactions in the regulation of temporal polyethism in honey bees as well as other social insects.
Received: 17 April 1997 / Accepted after revision: 26 December 1997 相似文献