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排序方式: 共有290条查询结果,搜索用时 250 毫秒
151.
Ena Smidt Katharina Meissl Johannes Tintner Franz Ottner 《Environmental Chemistry Letters》2010,8(3):217-222
Quantification of carbonate contents in fresh and weathered municipal solid waste incinerator (MSWI) bottom ash was performed
using volumetric and gravimetric methods, Fourier Transform Infrared (FT-IR) spectroscopy and thermal analysis. Results differ
considerably depending on the method applied. Volumetric measurement and thermogravimetry (TG) are based on the determination
of CO2 release by acid or thermal treatment, respectively. Interactions of CO2 with the mineral matrix and de novo synthesis of carbonates during thermal analysis were observed. In order to find out the
contribution of CO2 released from residual organic matter, an additional experiment was carried out to demonstrate how the material is affected
by the heating process in the course of thermal analysis. FT-IR spectroscopy as a non-destructive method seems to provide
the most reliable quantitative results. 相似文献
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155.
Johannes Methfessel 《Die Naturwissenschaften》1957,44(11):329-329
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157.
Tobias Weil Katharina Hoffmann Johannes Kroiss Erhard Strohm Judith Korb 《Die Naturwissenschaften》2009,96(2):315-319
In social insects, it is assumed that signals of the queen inform nestmates about her reproductive status. Thus, workers forego
their own reproduction if the queen signals high fertility. In hemimetabolous termites, little is known about reproductive
inhibition, but evidence exists for a royal-pair control. Workers of lower termites exhibit a high developmental flexibility
and are potentially able to become reproductives, but the presence of a fertile reproductive restrains them from reaching
sexual maturity. The nature of this control, however, remains unknown. Here, we report on qualitative differences in cuticular
hydrocarbon profiles between queens and workers of the basal drywood termite Cryptotermes secundus. Queens were characterized by a shift to long-chained and branched hydrocarbons. Most remarkably, similar chemical patterns
are regarded as fertility cues of reproductives in social Hymenoptera. This might suggest that both groups of social insects
convergently evolved similar chemical signatures. The present study provides deeper insights into how termites might have
socially exploited these signatures from sexual communication in their cockroach-like ancestor.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
158.
159.
Oxidation of As(Ⅲ) by potassium permanganate 总被引:3,自引:1,他引:2
LI N FAN Maohong Van Leeuwen Johannes Saha Basude YANG Hongqun HUANG C. P. 《环境科学学报(英文版)》2007,19(7):783-786
The oxidation of As(Ⅲ) with potassium permanganate was studied under conditions including pH, initial As(Ⅲ) concentration and dosage of Mn(Ⅶ). The results have shown that potassium permanganate was an effective agent for oxidation of As(Ⅲ) in a wide pH range. The pH value of tested water was not a significant factor affecting the oxidation of As(Ⅲ) by Mn(Ⅲ). Although theoretical redox analyses suggest that Mn(Ⅶ) should have better performance in oxidization of As(Ⅲ) within lower pH ranges, the experimental results show that the oxidation efficiencies of As(Ⅲ) under basic and acidic conditions were similar, which may be due to the adsorption of As(Ⅲ) on the Mn(OH)2 and MnO2 resulting from the oxidation of As(Ⅲ). 相似文献
160.
Bernd Klauer Johannes Schiller Frauke Bathe 《Journal of Environmental Planning and Management》2015,58(11):1944-1960
The EU Water Framework Directive calls for cost effective measures to achieve a “good status” in all European ground, surface and coastal waters. Besides eutrophication, the degradation of hydromorphology is the main reason for failing this objective. In this paper, we conceptualise the interactive decision support process BASINFORM-M for finding proper locations for river restoration. The concept combines the recently proposed “stepping stone approach” from aquatic ecology with elements from cost effectiveness analysis, multi-criteria analysis and participatory approaches. BASINFORM-M exemplifies a shift away from the isolated restoration of single river reaches towards a consideration of functional relationships within river networks. 相似文献