1,721,229 research outputs found
Bemerkungen zu Rhabdolaimus terrestris De Man und Rhabdolaimus aquaticus De Man (Nematoda, Aeraeolaimida)
No full textTraunspurger W. Bemerkungen zu Rhabdolaimus terrestris De Man und Rhabdolaimus aquaticus De Man (Nematoda, Aeraeolaimida). Spixiana. 1989;11(2):175-176
A study of the free-living freshwater nematodes of hard substrates in the littoral of the oligotrophic Königssee (National Park Berchtesgaden, F.R.Germany)
No full textTraunspurger W. A study of the free-living freshwater nematodes of hard substrates in the littoral of the oligotrophic Königssee (National Park Berchtesgaden, F.R.Germany). Spixiana . 1992;15(3):233-238
Response of bacteria and meiofauna to iron oxide colloids in sediments of freshwater microcosms
No full textHoess S, Frank-Fahle B, Lueders T, Traunspurger W. Response of bacteria and meiofauna to iron oxide colloids in sediments of freshwater microcosms. Environmental Toxicology and Chemistry. 2015;34(11):2660-2669
Long-term effects of selected xenobiotica on freshwater green-algae - development of a flow-through test system
No full textSchäfer H, Wenzel A, Fritsche U, Röderer G, Traunspurger W. Long-term effects of selected xenobiotica on freshwater green-algae - development of a flow-through test system. The Science of the Total Environment, Suppl., Part 1. 1993;(Suppl., Part 1):735-740
Life cycle and population growth rate of Caenorhabditis elegans studied by a new method
Full text linkMuschiol D, Schroeder F, Traunspurger W. Life cycle and population growth rate of Caenorhabditis elegans studied by a new method. BMC Ecology. 2009;9(1):14.Background: The free-living nematode Caenorhabditis elegans is the predominant model organism in biological research, being used by a huge number of laboratories worldwide. Many researchers have evaluated life-history traits of C. elegans in investigations covering quite different aspects such as ecotoxicology, inbreeding depression and heterosis, dietary restriction/supplement, mutations, and ageing. Such traits include juvenile growth rates, age at sexual maturity, adult body size, age-specific fecundity/mortality, total reproduction, mean and maximum lifespan, and intrinsic population growth rates. However, we found that in life-cycle experiments care is needed regarding protocol design. Here, we test a recently developed method that overcomes some problems associated with traditional cultivation techniques. In this fast and yet precise approach, single individuals are maintained within hanging drops of semi-fluid culture medium, allowing the simultaneous investigation of various life-history traits at any desired degree of accuracy. Here, the life cycles of wild-type C. elegans strains N2 (Bristol, UK) and MY6 (Münster, Germany) were compared at 20°C with 5 × 10 9 Escherichia coli ml -1 as food source. Results: High-resolution life tables and fecundity schedules of the two strains are presented. Though isolated 700 km and 60 years apart from each other, the two strains barely differed in life-cycle parameters. For strain N2 (n = 69), the intrinsic rate of natural increase (rmd-1), calculated according to the Lotka equation, was 1.375, the net reproductive rate (R 0) 291, the mean generation time (T) 90 h, and the minimum generation time (T min) 73.0 h. The corresponding values for strain MY6 (n = 72) were r m = 1.460, R 0 = 289, T = 84 h, and T min = 67.3 h. Peak egg-laying rates in both strains exceeded 140 eggs d -1. Juvenile and early adulthood mortality was negligible. Strain N2 lived, on average, for 16.7 d, while strain MY6 died 2 days earlier; however, differences in survivorship curves were statistically non-significant. Conclusion: We found no evidence that adaptation to the laboratory altered the life history traits of C. elegans strain N2. Our results, discussed in the light of earlier studies on C. elegans, demonstrate certain advantages of the hanging drop method in investigations of nematode life cycles. Assuming that its reproducibility is validated in further studies, the method will reduce the inter-laboratory variability of life-history estimates and may ultimately prove to be more convenient than the current standard methods used by C. elegans researchers
Nematodes from extreme and unusual freshwater habitats
No full textHodda M, Traunspurger W. Nematodes from extreme and unusual freshwater habitats. In: Traunspurger W, ed. Ecology of freshwater nematodes. Wallingford: CABI; 2021: 109-150
Production of freshwater nematodes
No full textBergtold M, Traunspurger W. Production of freshwater nematodes. In: Abebe E, Andrassy I, Traunspurger W, eds. Freshwater Nematodes: Ecology and taxonomy. Wallingford: CAB International; 2006: 752
Introduction to freshwater nematodes in ecology: current knowledge and research
No full textMajdi N, Traunspurger W. Introduction to freshwater nematodes in ecology: current knowledge and research. In: Traunspurger W, ed. Ecology of freshwater nematodes. Wallingford: CABI; 2021: 1-30
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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