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  • Other Sources  (115)
  • Wiley  (66)
  • ARGE GMIT, Bonn  (49)
  • 2020-2022  (56)
  • 1995-1999  (59)
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  • 1
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    Continuing the search for a law of mortality (1996)
    Wiley
    Details
    Publication Date: 2024-06-17
    Description: Scientists have long attempted to explain why closely similar age patterns of death are characteristic of highly diverse human and nonhuman populations. Historical efforts to identify a general "law of mortality" from these patterns that applied across species ended in 1935 when it was declared that such a law did not exist. These early efforts were conducted using mortality curves based on all causes of death. The authors predict that if comparisons of mortality are based instead on "intrinsic" causes of death (i.e., deaths that reflect the basic biology of the organism), then age patterns of mortality consistent with the historical concept of a law might be revealed. Using data on laboratory animals and humans, they demonstrate that age patterns of intrinsic mortality overlap when graphed on a biologically comparable time scale. These results are consistent with the existence of a law of mortality following sexual maturity, as originally asserted by Benjamin Gompertz and Raymond Pearl. The societal, medical, and research implications of such a law are discussed.
    Type: Article , PeerReviewed
    Format: text
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  • 2
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    Periphyton architecture and susceptibility to grazing by periwinkles (Littorina littorea, Gastropoda) (1999)
    Wiley
    Details
    Publication Date: 2024-03-20
    Description: Periphyton was grown on transparent plastic substrata in the Kiel Fjord and used for short-term laboratory experiments to study the feeding selectivity of the periwinkle Littorina littorea in response to the vertical structure of the periphyton. The susceptibility of algae to periwinkle grazing was assessed by comparing the species-specific biomass within the grazing tracks of the snails to the biomass outside the tracks. After 3 weeks of incubation, the periphyton consisted of a scattered monolayer of algal cells without vertical structure. No apparent grazing could be found. After 6 weeks of incubation, periphyton consisted of a tightly attached undergrowth (mainly Cocconeis scutellum, Bacillariophyceae, and Myrionema sp., Phaeophyceae) and canopy of filamentous (Melosira moniliformis, Bacillariophyceae) and stalked forms (Achnanthes longipes, Bacillariophyceae). The unicellular diatoms Fragilaria tabulata and Stauroneis constricta grew partly on the primary substratum and partly as epiphytes on the canopy species. The canopy species and the epiphytes were decimated inside the grazing tracks, while the tightly attached undergrowth species appeared ungrazed.
    Type: Article , PeerReviewed
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  • 3
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    Interfacial hydrodynamics and entrainment functions of currently used erosion devices (1997)
    Wiley
    Details
    Publication Date: 2022-04-11
    Type: Book chapter , NonPeerReviewed
    Format: text
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  • 4
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    How is ecosystem function affected by the hydrological lateral flows in complex landscapes? (1999)
    Wiley
    In:  How is ecosystem function affected by the hydrological lateral flows in complex landscapes? | Integrating hydrology, ecosystem dynamics and biogeochemistry in complex landscapes
    Details
    Publication Date: 2022-03-21
    Type: info:eu-repo/semantics/bookPart
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    CITATION PIK
  • 5
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    Geowissenschaftliche Mitteilungen - GMIT 86 (2021)
    ARGE GMIT, Bonn
    Details
    Publication Date: 2021-12-20
    Description: Die Ausgabe der Geowissenschaftlichen Mitteilungen vom September 2021 enthält die Themenblöcke: GEOfokus: (Die Antarktisforschung der BGR), GEOaktiv (Wirtschaft, Beruf, Forschung und Lehre), GEOlobby (Gesellschaften, Verbände, Institutionen), GEOreport (Geowissenschaftliche Öffentlichkeitsarbeit, Tagungsberichte, Ausstellungen, Exkursionen, Publikationen), GEOszene (Würdigungen, Nachrufe).
    Description: DFG, SUB Göttingen
    Description: journal
    Keywords: 550 ; Wissenschaftsorganisation und -pflege {Geologische Wissenschaften} ; GMIT ; Geowissenschaftliche Mitteilungen ; FID-GEO-DE-7
    Language: German
    Type: map , publishedVersion
    Format: 140
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    CITATION GEO-LEO
  • 6
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    Cyclic thermal fluctuations can be burden or relief for an ectotherm depending on fluctuations’ average and amplitude (2021)
    British Ecological Society | Wiley
    In:  Functional Ecology, 35 (11). pp. 2483-2496.
    Details
    Publication Date: 2021-11-10
    Description: Predicting the implications of ongoing ocean climate warming demands a better understanding of how short-term thermal variability impacts marine ectotherms, particularly at beyond-optimal average conditions during summer heatwaves. Using a globally important model species, the blue mussel Mytilus, in a 5-week-long experiment, we (a) assessed growth performance traits under 12 scenarios, consisting of four thermal averages (18.5, 21, 23.5 and 26℃) imposed as constant or daily fluctuating regimes with amplitudes of 2 or 4℃. Additionally, we conducted a short-term assay using different mussel individuals to (b) test for the species capacity for suppression and recovery of metabolic performance traits (feeding and aerobic respiration) when exposed to a 1-day thermal fluctuation regime (16.8–30.5℃). Using this high-resolution data, we (c) generated short-term thermal metabolic performance curves to predict and explain growth responses observed in the long-term experiment. We found that daily high-amplitude thermal cycles (4℃) improved mussel growth when fluctuations were imposed around an extreme average temperature of 26℃, representing end-of-century heatwaves. In contrast, thermal cycles negatively affected mussel growth at a less extreme average temperature of 23.5℃, resembling current peak summer temperature scenarios. These results suggest that fluctuations ameliorate heat stress impacts only at critically high average temperatures. The short-term assay demonstrated that during the warming phase, animals stopped feeding between 24 and 30℃ while gradually suppressing respiration. In the subsequent cooling phase, feeding and respiration partially and fully recovered to pre-heating rates respectively. Furthermore, nonlinear averaging of short-term feeding responses (upscaling) well-predicted longer term growth responses to fluctuations. Our findings suggest that fluctuations can be beneficial to or detrimental for the long-term performance of ectothermic animals, depending on the fluctuations' average and amplitude. Furthermore, the observed effects can be linked to fluctuation-mediated metabolic suppression and recovery. In a general framework, we propose various hypothetical scenarios of fluctuation impacts on ectotherm performance considering inter- or intra-species variability in heat sensitivity. Our research highlights the need for studying metabolic performance in relation to cyclic abiotic fluctuations to advance the understanding of climate change impacts on aquatic systems. A free Plain Language Summary can be found within the Supporting Information of this article
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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  • 7
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    Early reduction of the challenge recovery rate following immunization with irradiated infective larvae in a filaria mouse system (1997)
    Wiley
    In:  Tropical Medicine and International Health, 2 (12). pp. 1170-1174.
    Details
    Publication Date: 2021-09-06
    Description: The filaria Litomosoides sigmodontis, which develops a patent infection in BALB/c mice, was used to determine the fate of a challenge inoculum following immunization of mice with irradiation attenuated infective larvae (3 subcutaneous inoculations at weekly intervals with 25 L3 irradiated at 60 krad, and challenge with 25 L3 two weeks after the final immunization). The adult worm burden of vaccinated mice was reduced to 50% of that of controls although the pattern of larval migration and microfilaraemia were not affected. Necropsies showed that the increased killing of the filariae of the challenge inoculum occurred at the L3 stage within the first 2 days of challenge. This result draws attention on the protective mechanisms operating very early and probably in the subcutaneous region.
    Type: Article , PeerReviewed
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  • 8
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    Geowissenschaftliche Mitteilungen - GMIT 36 (2021)
    ARGE GMIT, Bonn
    Details
    Publication Date: 2021-08-07
    Description: Die Ausgabe der Geowissenschaftlichen Mitteilungen vom Juni 2009 enthält die Themenblöcke: GEOfokus: (Geoparks in Deutschland - Entwicklung und Situation), GEOaktiv (Wirtschaft, Beruf, Forschung und Lehre), GEOlobby (Gesellschaften, Verbände, Institutionen), GEOreport (Geowissenschaftliche Öffentlichkeitsarbeit, Tagungsberichte, Ausstellungen, Exkursionen, Publikationen), GEOszene (Personalia, Nachrufe).
    Description: DFG,SUB Göttingen
    Description: journal
    Keywords: Wissenschaftsorganisation und -pflege {Geologische Wissenschaften} ; GMIT ; Geowissenschaftliche Mitteilungen ; FID-GEO-DE-7
    Language: German
    Type: anthology , publishedVersion
    Format: 103
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    CITATION GEO-LEO
  • 9
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    Kinetics of Cadmium and Cobalt Desorption from Iron and Manganese Oxides (1995)
    Wiley
    In:  Soil Science Society of America Journal, 59 (3). pp. 778-785.
    Details
    Publication Date: 2021-07-28
    Description: Oxides of Fe and Mn in soils are capable of sorbing large amounts of trace metal ions and can therefore be important in controlling trace metal concentrations in soil solution, and hence trace metal bioavailability in soils. There is, however, relatively little information on the rates of desorption of trace metals from oxide materials or on the factors affecting desorption rates. The objective of this study was to examine the kinetics of desorption of Cd and Co from two Fe oxides, goethite and ferrihydrite, and from two Mn oxides, hausmannite and cryptomelane. The concentrations of Cd and Co specifically sorbed by the oxides at pH 6.0 were greater for the Mn oxides than for the Fe oxides. The metals were also much less readily desorbed from the Mn than the Fe oxides and, in general, Cd was more readily desorbed than Co from all four oxides. Increasing the initial sorption period from 1 to 15 wk substantially decreased the proportion of sorbed Cd or Co subsequently desorbed from goethite, with a similar but much smaller effect also observed with the Mn oxides. Desorption kinetics for both Cd and Co were found to be described well by assuming either the occurrence of two simultaneous first-order desorption reactions, or by a continuous distribution of reaction sites, distributed lognormally with respect to desorption first-order rate constant. With increasing initial sorption period, the parameters obtained from fitting either type of kinetic equation to the experimental data could be interpreted as indicating a movement of metal ions to sites with slower desorption reactions.
    Type: Article , PeerReviewed
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  • 10
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    Geowissenschaftliche Mitteilungen - GMIT 35 (2021)
    ARGE GMIT, Bonn
    Details
    Publication Date: 2021-07-12
    Description: Die Ausgabe der Geowissenschaftlichen Mitteilungen vom März 2009 enthält die Themenblöcke: GEOfokus: (Angewandte Mineralogie in der modernen Baustoff- und Bindemittelforschung), GEOaktiv (Wirtschaft, Beruf, Forschung und Lehre), GEOlobby (Gesellschaften, Verbände, Institutionen), GEOreport (Geowissenschaftliche Öffentlichkeitsarbeit, Tagungsberichte, Ausstellungen, Exkursionen, Publikationen), GEOszene (Personalia, Nachrufe).
    Description: DFG,SUB Göttingen
    Description: journal
    Keywords: 550 ; Wissenschaftsorganisation und -pflege {Geologische Wissenschaften} ; GMIT ; Geowissenschaftliche Mitteilungen ; FID-GEO-DE-7
    Language: German
    Type: anthology , publishedVersion
    Format: 85
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    CITATION GEO-LEO
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