1,363 research outputs found
Climate change effects on planktonic bacterial communities in the ocean: from structure and function to long-term and large scale observations.
No full textPlanktonic bacterial communities of marine environments can be considered to be affected by climate change through a set of direct and indirect effects. As direct effects of climate change, elevated temperature and ambient CO2 levels have to be taken into account. As indirect effects a large spectrum of impacts ranging from increased stratification of surface water, deoxygenation of subsurface water, increased occurrence of extreme weather events, and a changed food chain and nutrient regime resulting in a changed top down and bottom up control for bacterioplankton. All these direct and indirect effects will affect bacterial communities in a multifaceted way. Changes in the bacterial communities due to climate change impacts can be expected on all different taxonomic levels, i.e. from the clonal intraspecies level to the phylum level. The focus of the article will be on the evaluation of bacterioplankton observations over time and space and along climate gradients in the frame of environmental parameters allowing modelling with respect to climate change scenarios. A specific emphasis will be on bacterioplankton analysis based on analysis of samples of the Continuous Plankton Recorder Archive. This sample archive allowed insights into particle associated bacteria of coastal environments over more than the last 60 years. Beside effects of climate change effectors on bacterial growth and community composition, effects of climate change on bacteria-mediated marine biogeochemical cycling and potential hazards by increased abundance of pathogenic bacteria such as Vibrio cholerae will be considered
Ingrid Ylva och tornet i Bjälbo
No full textThe article discusses the background to the erection of the huge church tower in Bjälbo, Östergötland, Sweden. It also focuses on medieval women as founders of churches. The author maintains that new dendrochronological dating of the tower could mean that founder of this building piece was not one of the male members of the important Bjälbo dynasty, but Ingrid Ylva the mother of Birger Jarl
Ingrid Winterbach: Novelist (Interview)
No full textWinner of the prestigious Hertzog Prize for Literature for Niggie (2002)Ingrid Winterbach is the author of eight novels, three of which have been translated into English and two into Dutch. The translation of her fourth novel, Karolina Ferreira (1993) as The Elusive Moth (2005), and subsequently, Niggie as To Hell with Cronjé (2007) and Die boek van toeval en toeverlaat (2006) as The Book of Happenstance (2008), have brought this author to the attention of a wider South African readership
Effects of Global Warming on Vibrio Ecology.
No full textVibrio-related infections are increasing worldwide both in humans and aquatic animals. Rise in global sea surface temperature (SST), which is approximately 1 °C higher now than 140 years ago and is one of the primary physical impacts of global warming, has been linked to such increases. In this chapter, major known effects of increasing SST on the biology and ecology of vibrios are described. They include the effects on bacterial growth rate, both in the field and in laboratory, culturability, expression of pathogenicity traits, and interactions with aquatic organisms and abiotic surfaces. Special emphasis is given to the effect of ocean warming on Vibrio interactions with zooplankters, which represent one of the most important aquatic reservoirs for these bacteria. The reported findings highlight the biocomplexity of the interactions between vibrios and their natural environment in a climate change scenario, posing the need for interdisciplinary studies to properly understand the connection between ocean warming and persistence and spread of vibrios in sea waters and the epidemiology of the diseases they cause
The role of micro-organisms in the ecological connectivity of running waters
No full textPusch M, Fiebig D, Brettar I, et al. The role of micro-organisms in the ecological connectivity of running waters. Freshwater Biology. 1998;40(3):453-495
7. When They Left
No full textFigure 7.1 The author, Ingrid Griffith (right) with her sister Dawn (left) and brother Oliver (center) in December 1968. Their maternal grandmother had taken them to Skevelair’s Photo Studio in Georgetown, Guyana to pose in the church outfits their parents, who had recently migrated to the United States, had sent for Christmas. © Griffith Family Collection. Courtesy of Ingrid Griffith. CC BY 4.0. It was one of the worst days of my life. I was seven years old, my sist..
270 - Ingrid Jane Slette
No full textGlobal climate change is causing more extreme droughts, as well as subtler chronic changes in precipitation patterns. Both chronic and extreme precipitation change can alter ecosystem structure and function, and these alterations may affect how systems respond to future extreme climatic events. Understanding how legacies of various past precipitation changes may alter the effects of future extreme droughts will be important for predicting ecosystem responses to climate change. We investigated how ecological legacies of experimentally-imposed chronic and extreme precipitation changes altered the impact of an extreme drought on an economically-important grassland ecosystem.Top Scholars for University-Wide Graduate Programs
Denitrifikation in der Wassersäule der Zentralen Ostsee : Regulationsfaktoren und mikrobiologische Aspekte = Denitrification in the water column of the Central Baltic : Regulatory Factors and Microbiological Aspects
No full textIm Sommer 1986 und 1987 wurden Untersuchungen zur Denitrifikation in der Wassersäule der zentralen Ostsee durchgeführt Schwerpunkt der Untersuchungen war, die regulierenden Mechanismen der Denitrifikation zu erforschen. Als Untersuchungsgebiete dienten das zentral gelegene Gotlandtief und die im Norden gelegene Station T.
- Denitrifikationsraten wurden mit Hilfe der Azetylenblockmethode erfaßt. Die ermittelten Raten lagen zwischen 13,8 und 110 nmol N/l x d.
- Vor dem Hintergrund der gängigen bakteriologischen Rahmenparameter wurde die Anzahl von Denitrifikanten und Nitratreduzierern erfaßt. Die Anzahl der heterotrophen Denitrifikanten in der Wassersäule bewegte sich zwischen ungefähr 50 und 2400 Bakterien pro ml.
- Es zeigte sich, daß die Denitrifikation in der Wassersäule der zentralen Ostsee, sowohl in Bezug auf die Umsatzraten, als auch die räumliche Ausdehnung durch den verfügbaren organischen Kohlenstoff limitiert war. Die geringe Verfügbarkeit schien die Denitrifikation im wesentlichen auf "energiereiche" Grenzschichten wie oxisch-anoxische und Sediment-Wasser-Grenzschichten zu beschränken.
- Für die Denitrifikation an der oxisch-anoxischen Grenzfläche konnte gezeigt weiden, daß autotrophe Denitrifikation unter Nutzung von reduzierten Schwefelverbindungen aus dem anoxischen Bereich als Elektronendonatoren einen bedeutenden Beitrag zu leisten vermag ("H2S-Denitrifikation")..
Funktionelle Analyse von potententiell aktivierenden FGFR3 Mutationen
No full textAuthor Ingrid Hartl, MScAbweichender Titel laut Übersetzung der Verfasserin/des VerfassersDissertation Johannes Kepler Universität Linz 2022Arbeit nach Ablauf der Sperre auf den öffentlichen PCs in den Bibliotheken der JKU+Medizin abrufba
Nitrate elimination by denitrification in hardwood forest soils of the Upper Rhine floodplain – correlation with redox potential and organic matter
No full textDenitrification in floodplains is a major issue for river- and groundwater quality. In the Upper Rhine valley,
floodplain forests are about to be restored to serve as flood retention areas (polders). Besides flood attenuation
in downstream areas, improvement of water quality became recently a major goal for polder construction. Redox
potential monitoring was suggested as a means to support assessment of nitrogen elimination in future floodplains
by denitrification during controlled flooding. To elucidate the relationship between redox potential and denitrification,
experiments with floodplain soils and in situ measurements were done. Floodplain soil of two depth
profiles from a hardwood forest of the Upper Rhine valley was incubated anaerobically with continuous nitrate
supply. Reduction of nitrate was followed and compared with redox potential and organic matter content. The
redox potential under denitrifying conditions ranged from 10 to 300 mV. Redox potential values decreased with
increasing nitrate reduction rates and increasing organic matter content. Furthermore, a narrow correlation between
organicmatter and nitrate reduction was observed. Experiments were intended to help interpreting redox potentials
generated under in situ conditions as exemplified by in situ observations for the year 1999. Results obtained by
experiments and in situ observations showed that monitoring of redox potential could support management of the
flooding regime to optimize nitrogen retention by denitrification in future flood retention areas
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